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ISSN 0254-0096 CN 11-2082/K
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EQUIVALENT CIRCUIT MODEL OF LITHIUM-ION BATTERIES ATTACHED CONTROLLED VOLTAGE SOURCE IN ENERGY STORAGE SYSTEM
Liu Yujie, Zhao Wei, Sun Xiaofeng, Wang Baocheng, Li Xin
2023, 44 (8): 1-9.    doi: 10.19912/j.0254-0096.tynxb.2022-0492
Abstract351)      PDF (2335KB)(5)      
This article proposed a model improvement method based on the second-order RC equivalent circuit model, which was carried out under testing conditions of missing temperature sample and fewer discharge current sample. And a BP neural network was constructed to predict the terminal voltage error of the model in a wide range of temperature and current rates, in order to achieve dynamic compensation of the model. This method can avoid the loss of cycle life caused by repeated charging and discharging experiments of lithium-ion batteries. The simulation and experimental results indicate that the proposed small sample data expansion method is feasible; The battery model with an additional controllable voltage source has better adaptability at different temperatures and current rates, improving the accuracy of the model. Through model analysis, batteries are screened to form a cascade utilization energy storage system, and combined with battery models to achieve SOC prediction and heat warning. The model has practical engineering significance for the application of new energy generation battery energy storage systems.
CONTROL CHARACTERISTICS EVALUATION AND MULTIPLE GENERATOR STABILITY ANALYSIS OF VOLTAGE CONTROLLED VIRTUAL SYNCHRONOUS GENERATORS
Li Zhi, Zhang Yangfan, Liu Mingbo, Liu Hui, Sun Weimin, Li Yang
2023, 44 (10): 1-8.    doi: 10.19912/j.0254-0096.tynxb.2022-0713
Abstract315)      PDF (2164KB)(1)      
Through simulating the mechanical motion equation of synchronous generator, this paper proposed voltage-controlled virtual synchronous generator, designed the prime mover regulation and excitation regulation control strategy, and simulated the rotational inertial of synchronous generator, so as to improve the active support ability of renewable energy for power grid operation stability. This paper proposed five control characteristics evaluation indicators including active power-load coefficient, active power frequency regulation coefficient, reactive power voltage regulation coefficient, primary frequency regulation stable time, and reactive power voltage regulation stable time. In addition, based on Matlab/Simulink’s electromagnetic transient simulation and verification model of voltage-controlled virtual synchronous generator, the influence of different key control parameters on the performance of voltage-controlled virtual synchronous generator active frequency regulation and reactive power regulation under small disturbances, quantitative analysis the trends and laws of key indicators were analyzed. The virtual inertial, damping parameters, reactive power integral parameter and droop parameter optimization parameter range were given for engineering application. Finally, the interactive resonance mechanism of voltage-controlled virtual synchronous generators was studied by establishing the parallel grid-connected system model of multiple voltage-controlled virtual synchronous generators. The critical parameters, oscillation frequency and multi-generators parallel oscillation mode of multiple voltage-controlled virtual synchronous generators grid-connected system were obtained.
COMPARISON OF DYNAMIC RESPONSE OF TWO FLOATING WIND FARM PLATFORMS FOR OFFSHORE WIND TURBINES
He Hongsheng, Li Chun, Wang Bo, Li Shujun, Zhang Li, Ding Qinwei
2023, 44 (4): 1-8.    doi: 10.19912/j.0254-0096.tynxb.2021-0564
Abstract310)      PDF (2493KB)(35)      
In order to study the dynamic response of different floating wind farm platforms with offshore wind turbine under the combined action of wind, wave and current, 2×2 array floating wind farms based on OC3-Hywind Spar and ITI Energy Barge platform are established respectively. Combined with radiation and diffraction theory and finite element method, the hydrodynamic and aerodynamic loads are calculated by ocean engineering software AQWA and wind turbine simulation software FAST respectively, and the time-frequency response characteristics of the two floating wind farm platforms are analyzed. The results show that the frequency domain responses of both Spar and Barge platforms are concentrated in the low-frequency region below 2.00 rad/s. Among the two types of wind farms, the platforms of Spar wind farm have better stability in heave, pitch, roll, yaw four degrees of freedom and nacelle vibration acceleration. The magnitude of platform sway, surge and nacelle vibration acceleration are related to their position in the wind farm.
PERFORMANCE RESEARCH OF RADIAL-INFLOW TURBINE IN OCEAN THERMAL ENERGY CONVERSION
Ding Ce, Liu Xiangdong, Zhang Chengbin, Chen Yongping
2023, 44 (6): 1-7.    doi: 10.19912/j.0254-0096.tynxb.2022-0079
Abstract271)      PDF (2531KB)(18)      
Aiming at the high-efficiency OTEC application, a 3 kW radial-inflow turbine using R134a was constructed. In addition, a 3D CFD simulation was carried out to research the turbine performance and analyze the variable conditions. Finally, the influences of radial clearance and the number of rotor blades on the performance of radial-inflow turbines are analyzed. It is indicated that the performance of the designed turbine is satisfactory with a theoretical isentropic efficiency of 84.96%. The results show that the optimal rotational speed of turbine increases with the increasement of inlet pressure. When the rotational speeds deviate from the optimal value, the turbine efficiency decreases. The results also indicate that the increasement of inlet pressure increases the output work of turbine. With the increasement of rotational speed, the flow rate gradually decreases. In terms of optimization, the radial clearance between the nozzle and the rotor makes the working fluid flow more uniform at the nozzle outlet. Finally, the turbine performance is improved by increasing the number of rotor blades to 8.
PHYSICAL MODEL TEST OF THERMAL EFFICIENCY OF METAL-BASED BOREHOLE HEAT EXCHANGER IN AQUIFERS
Shao Yanting, Li Peijia, Zhang Jiale, Luo Jin
2023, 44 (7): 1-6.    doi: 10.19912/j.0254-0096.tynxb.2022-0284
Abstract266)      PDF (1680KB)(6)      
In order to overcome the drawbacks of low thermal efficiency and poor sustainable performance, this paper proposes a novel strategy using metal pipes and backfilling the borehole with permeable materials. The heat transfer process under different geo-materials and the soil temperature response are investigated through physical model tests. The results show that the energy efficiency coefficient (EEC) of a metal pipe increases with the increased permeability of the geo-materials. Compared with clay, the EEC of gravel with a hydraulic conductivity of 1.04×10 -3 m/s increases by 72.31%, indicating the aquifer is a suitable geological setting for the application of the proposed technology. The monitoring of soil temperature display that the higher the hydraulic conductivity the slower the temperature change of the aquifer is, implying a higher thermal diffusion which in turn improves heat transfer efficiency. The EEC of the heat exchanger with a heating power of 100 W increases by 73.08% compared to 50 W, indicating the effects of thermally induced heat convection are more significant at a higher thermal load.
OPTIMIZATION OF PROCESS PARAMETERS OF BUCKWHEAT STRAW SEEDLING BOXING BASED ON MOPSO
Yang Jie, Zhang Jing, Sun Xinyi, Zhang Yingnan, Zheng Decong
2023, 44 (5): 1-9.    doi: 10.19912/j.0254-0096.tynxb.2021-1401
Abstract244)      PDF (2661KB)(24)      
Response surface methodology (RSM) is used to study the relationship between three physical properties of biomass seedling pot density, drop breakage rate and pressure breakage rate of buckwheat straw and molding pressure, dosage of binder and holding time. MOPSO optimization algorithm is used to carry out three response optimization analysis of process parameters. The experimental results show that when the pressure is 8-12 MPa, the amount of binder is 60%-90%, and the pressure holding time is 11-14 min, the seedling pot density can reach above 1.041 g/cm 3, and the drop damage rate and pressure damage rate are below 2.97% and 2.65%, respectively. When the optimal molding parameters are pressure 11.73 MPa, binder dosage 60.5% and holding time 12.7 min, the seedling pot density reaches 1.168 g/cm 3, and the drop damage rate are 2.52% and 2.58%, respectively.
SHIFTABLE LOAD GROUP AGGREGATION AND CHARACTERISTIC EVALUATION IN CHINA'S RURAL RESIDENTIAL COMMUNITIES IN SOLAR ENERGY ABUNDANT AREA
Luo Xi, Zhao Tianliang, Liu Yanfeng, Yang Yanzi
2023, 44 (12): 1-8.    doi: 10.19912/j.0254-0096.tynxb.2022-1347
Abstract236)      PDF (2077KB)(24)      
In this paper, a typical rural area in northern Shaanxi province was investigated, Monte Carlo simulation was used to generate aggregated shiftable load curves on the basis of family clustering, and a comprehensive evaluation from the perspectives of time, energy, and randomness was given. The results show that the volume of cooking load is large but the time range to be shifted is small, while the volume of laundry load is small but the time range to be shifted was large. Overall, domestic hot water load is more comprehensive in the above three aspects, the heat storage properties of water tank makes the shiftable load potential more significant.
NUMERICAL SIMULATION OF ENERGY HARVESTING FROM FLOW-INDUCED VIBRATION OF DIFFERENT DIAMETER CYLINDERS
Guo Kai, Cheng Yuxuan, Tang Bowen, Fan Xiantao, Tan Wei, Zhang Hongsheng
2023, 44 (9): 1-8.    doi: 10.19912/j.0254-0096.tynxb.2022-0714
Abstract218)      PDF (2037KB)(4)      
To investigate the application prospects and energy harvesting characteristics of two tandem cylinder with different diameter ratios in the field of wind vibration power generation,the vibration response and energy conversion characteristics of a two tandem cylinder system with different diameters are investigated under the condition of L/ D=1.5, where the upstream cylinder is fixed and the downstream cylinder only vibrates in the transverse direction. The results indicate that the downstream cylinder exhibits both vortex-induced vibration and galloping vibration response, and the diameter ratio affects the vibration response and force characteristics of the downstream cylinder, which leads to the change of the lock-in velocity range. The galloping exhibits a harvesting power two times larger than the vortex-induced vibration. The energy conversion efficiency can be about 30% in the vortex-excited vibration region, but only 10% in galloping region. Based on these analysis results, the advantage of d/ D=0.8 energy conservation is more notable at low reduced velocity, but at high reduced velocity, the advantage of d/ D=0.6 energy conservation become more significant.
DEFROST PERFORMANCE STUDY OF CONTINUOUS HEATING AIR SOURCE HEAT PUMP SYSTEM WITH SEGMENTED DEFROST
Liu Xi'an, Chen Hai, Feng Ronjie, Huang Tao, He Shiquan, Tang Lan
2023, 44 (11): 1-8.    doi: 10.19912/j.0254-0096.tynxb.2022-1136
Abstract213)      PDF (2255KB)(4)      
Based on continuous heating air source heat pump hot gas bypass defrost technology, this study proposes a segmental defrosting continuous heating air source heat pump system and investigates its performance in an enthalpy difference lab. The results show that lower ambient temperature or lower relative humidity or higher condensing temperature will reduce the average heating capacity of the segmental defrosting system. The change of compressor suction pressure in the process of segmental defrosting is 698.5 kPa smaller than that of reverse cycle defrost, and the change of discharge pressure is 238.9 kPa smaller than that of reverse cycle defrost. The defrosting sequence from top to down takes more time for each coil, while the defrosting sequence from down to top takes basically the same time for each coil, top to down defrosting sequence reduces total defrosting time by 55 s compared to top to down defrosting sequence, but has an impact on“secondary frosting”. Compared with the traditional reverse cycle defrost system, the segmental defrosting system has the advantages of short defrosting time and continuous heating, high COP, and less impact on the system. The switching of valves during defrosting will cause some local pressure fluctuations and energy loss in this system, which needs to be further optimized.
STUDY OF INFLUENCE OF STRUCTURAL SHAPE ON THERMAL CHARACTERISTICS OF SOLAR CHIMNEY SYSTEMS
Jia Jing, Nie Jing, Wang Jingwen, Su Hao, Yan Suying, Gao Hong
2024, 45 (2): 1-9.    doi: 10.19912/j.0254-0096.tynxb.2022-1557
Abstract213)      PDF (2896KB)(50)      
Different shapes of solar chimney (SC) systems have different effects on the heat collection characteristics of the system. A 10° circular SC numerical simulation model and a test bench were established. The comparision betweenthe numercial simulation and the test results showed that the relative error was less than 4%, which ensured the correctness of the model and numerical simulation method. The same numerical simulation method was used to calculate the 0° circle, 0° square and 10° square SC models, and the results of different systems were compared. The results show that the uniformity of the surface temperature field of the absorber varies with different system structures, and the influence of the chimney shadow on the surface temperature field of the 10° square absorber is the least. Compared with the fluid velocity in the chimney, the 10° square has a higher velocity gradient, which is more conducive to determining the turbine position. The total enthalpy difference of the fluid in the chimney of different systems is different, and the total enthalpy difference of the 10° square is larger. Compared with the 0° circular SC system, the collector efficiency of the other three SC systems is increased by 11.328%, 43.705% and 66.061%, respectively, and the mass flow rate is increased by 59.36%, 8.39% and 39.04%.
PARAMETER IDENTIFICATION OF SOLAR CELL MODEL BASED ON IPOA
Wu Yanjuan, Liu Zhenchao, Wang Yunliang
2024, 45 (1): 1-10.    doi: 10.19912/j.0254-0096.tynxb.2022-1416
Abstract200)      PDF (1951KB)(150)      
Accurate identification of solar cell model parameters has a great impact on PV module power prediction and maximum power point tracking, and it must be ensured to have high accuracy. Traditional intelligent algorithms can achieve a certain degree of parameter identification, but they all suffer from the problems of insufficient accuracy, slow convergence, and easy to fall into local optimality. To address such problems, a solar cell model parameter identification method based on the improved pelican optimization algorithm (IPOA) is proposed. In this algorithm, the population individuals are closely connected, and the position is updated by mutual learning of randomness, which has better effect than the traditional algorithm in engineering applications. At the same time, for the characteristics of this algorithm, a position updating strategy based on Jaya algorithm is introduced to make the candidate solutions of the population more optimal; the decreasing factor is improved to make the model better in the later stage of the iteration. The Lévy flight strategy is added, which effectively improves the algorithm accuracy. IPOA has good results under different solar irradiance, and the discrimination results fit well with the actual curves, indicating that IPOA can accurately and effectively identify the solar cell model parameters in different environments.
RESEARCH PROGRESS OF TCO FILMS FOR SILICON HETEROJUNCTION SOLAR CELLS
Wang Mengxiao, Wang Guanghong, Zhao Lei, Mo Libin, Diao Hongwei, Wang Wenjing
2023, 44 (11): 16-22.    doi: 10.19912/j.0254-0096.tynxb.2022-1088
Abstract194)      PDF (1733KB)(17)      
Increasing the current of the silicon heterojunction(HJT) solar cell is expected to further improve its efficiency. Transparent conductive oxide film (TCO) is an important functional layer that affects the current of the HJT solar cell. In this paper, the characteristics of TCO films are firstly introduced, including the effects of doping elements, doping ratios and preparation techniques on the film properties. Moreover, the influence of film properties on the performance of HJT cells is summarised. Finally, the latest progress and development trend of TCO film application are described. Increasing the cap layer or adopting multilayer TCO film structure is expected to improve the characteristics of TCO films and solar cell performance. It is expected to guide the optimization of TCO films characteristics, so as to further improve the efficiency of HJT solar cell and accelerate its industrialization process.
OPTIMAL CONTROL STRATEGY FOR HYBRID ENERGY STORAGE ZONING CONSIDERING COMPENSATING WIND POWER FORECASTING ERROR AND SMOOTHING FLUCTUATION
Zhang Qi, Xie Lirong, Wang Wei, Wang Hejia, Liu Xin, Bao Hongyin
2023, 44 (7): 7-13.    doi: 10.19912/j.0254-0096.tynxb.2022-0468
Abstract190)      PDF (1620KB)(1)      
Under the background of ‘dual carbon’, based on the comprehensive target domain of wind power forecasting error and smoothing fluctuation, a control strategy is proposed to compensate both the prediction error and smoothing fluctuation of wind power. Firstly, the allowable range of prediction error and wind power fluctuation is determined more strictly than that of the national standard, and the comprehensive target area is established. The target domain is divided into internal and external parts, using improved complete ensemble empirical mode decomposition with adaptive noise (ICEEMDAN) and technique for order preference by similarity to an ideal solution (TOPSIS)to calculate the scope of super capacitor and battery, which bear the part with the larger change rate and the smooth part respectively. And then, the hybrid energy storage batteries acting on the target domain are divided into four groups, and the states are switched according to the charge/discharge power. Finally, a wind farm in Xinjiang was taken as an example for simulation analysis, and a comprehensive comparison of various decomposition methods and energy storage configuration methods was made to prove the effectiveness of the proposed strategy.
RESEARCH ON WIND TURBINE MODELING BASED ON DIGITAL TWIN TECHNOLOGY
Shang Haiyong, Liu Liqiang, Qi Yongsheng, Li Yongting
2023, 44 (5): 391-400.    doi: 10.19912/j.0254-0096.tynxb.2021-1618
Abstract175)      PDF (17966KB)(26)      
In response to the problem that the previous digital twin modeling of the wind turbine is limited by different research purposes or the function of a single software, which makes it challenging to establish the whole model of the wind turbine, a new wind turbine twin modeling method is proposed. The method first relies on the FAST wind performance module to build the steady-state and the random turbulent wind model, the real-time wind speed model of wind farms. Then the aerodynamics module and the structural dynamics module are used to build the geometric and dynamics models of critical components such as wind turbine blade and towers respectively. Finally, the wind turbine electrical system model and control strategy were built in Simulink, which resulted in a complete twin model of the wind turbine. The twin modeling approach was validated for WindPACT 1.5 MW doubly-fed wind turbine and Fuhrländer 2.5 MW doubly-fed wind turbine at a wind farm, and the results showed that the twin model has a high accuracy of all essential production parameters compared to the design standard and actual operation data under different wind speed models. In addition, the feasibility and validity of the twin model were further demonstrated by real-time simulation of the wind turbine digital twin system and twin simulation of the unmeasurable data in the field.
PROGRESS ON RECYCLING METHODS AND REMANUFACTURING TECHNOLOGY OF WASTE WIND TURBINE BLADES
Chen Jipeng, Wang Ji’an, Zhang Yuqiu, Zhou Hongping
2023, 44 (5): 328-335.    doi: 10.19912/j.0254-0096.tynxb.2021-1424
Abstract161)      PDF (3048KB)(32)      
Firstly, the application scale of wind power blades at home and abroad and the trend of decommissioned wind power blades are introduced, and the international common disposal methods of decommissioned wind power blades(stacking, burying, and recycling) and their advantages and disadvantages are described. Secondly, the typical recycling methods of waste blade materials, namely mechanical recycling, thermal recycling, and chemical recycling, are systematically introduced, and the technical characteristics of the above three typical recycling methods are compared. Thirdly, the typical cases of product remanufacturing using retired wind power blades are summarized, including the preparation of recycled composite plates, the manufacture of concrete aggregates, the preparation of 3D printing consumables, etc. Finally, aiming at the difficult cutting performance of common wind power materials such as glass fiber composites and carbon fiber composites, the recycling processing technology and equipment of wind power blades are introduced, including cutting processing technology and equipment, crushing and crushing processing technology and equipment, etc.
HOT SPOT EFFECT FOR PHOTOVOLTAIC MODULES
Wang Le, Chen Xue, Zhang Shu, Wang Faze, Wang Jun
2023, 44 (7): 155-161.    doi: 10.19912/j.0254-0096.tynxb.2022-0301
Abstract156)      PDF (1884KB)(31)      
This paper conducts a test study on the hot spot temperature of modules prepared by current mainstream module products, especially large-size cells, and specifically analyzes the key influencing factors affecting the hot spot temperature. The hot spot temperature of the shaded cells is determined by the power dissipated per unit area Φ q, i.e., it is related to the number of cells in a single string, the cell leakage current, and the distribution of the cell leakage current. The non-uniform heating at the cell leakage point is the main reason for the high local temperature of the hot spot. At the same time, this paper discusses the hot spot risk control of modules with a relatively large number of single-string cells. The control of cell leakage current value at reverse bias voltage can effectively reduce the hot spot temperature. The screening of cells based on the temperature difference between cell leakage point and non-leakage area at reverse bias voltage can further control the hot spot risk.
DYNAMIC RESPONSE ANALYSIS OF SEMI-SUBMERSIBLE FLOATING WIND TURBINE UNDER DIFFERENT WIND CONDITIONS
Li Chang, Wang Yuanbo, Jiang Mingzhen, Zhang Leian, Huang Xuemei, Yang Tingyi
2023, 44 (4): 85-91.    doi: 10.19912/j.0254-0096.tynxb.2021-1509
Abstract153)      PDF (1896KB)(21)      
In order to solve the problem of large motion responses of the existing floating wind turbines under the action of wind and waves, a new type of semi-submersible platform with round table-shaped buoy is proposed. Based on FAST coupling hydrodynamics, aerodynamics and mooring system and other physical fields, combined with the frequency domain parameters calculated by hydrodynamics software AQWA, the dynamic responses of the floating wind turbine under different wind conditions are analyzed, and compared with OC4-DeepCwind floating wind turbine under rated wind condition. The analysis results show that different wind speeds have obvious influence on the surge, pitch and yaw motions of the floating wind turbine, but have little influence on the heave motion. Compared with the OC4 floating wind turbine, the pitch and roll responses of the new floating wind turbine are obviously reduced under various wind conditions, and have good stability.
RESEARCH ON COMBINED SIMULATION AND OPTIMIZATION OF COOLING, HEATING AND POWER SYSTEM WITH SOLAR ENERGY
Kuang Huizi, Li Wei, Wang Xu, Xu Ye, Liu Kaicheng, Tan Junyuan
2023, 44 (5): 80-87.    doi: 10.19912/j.0254-0096.tynxb.2021-1541
Abstract141)      PDF (1884KB)(10)      
Accurate architecture-load prediction and equipment-output calculation are the key to realize the operation optimization of integrated energy system. In this paper, the procedure of “load prediction-device simulation-software simulation-collaborative optimization” was firstly designed. Secondly, DeST software was used to predict the cooling and heating load and PVsyst software was exploited to calculate the photovoltaic power. Next, the power output of gas turbine was estimated by aid of simulation model. Finally, the obtained results based on above three processes were incorporated into pre-established operation optimization model in order to generate reasonable and efficient energy-provision scheme. Compared with traditional optimization model, the schedule pattern based on integrated method was beneficial to achieve balance between energy supply and demand, also was capable of providing a good demonstration for the operation and management of other similar systems.
COMPREHENSIVE ENERGY EFFICIENCY AND PARAMETER OPTIMIZATION RESEARCH OF BIFACIAL PHOTOVOLTAIC VERTICAL SHADING SYSTEM
Yang Zhirui, Peng Jinqing, Wang Meng, Zhou Hao, Song Jiaming, Liu Hong
2023, 44 (12): 9-16.    doi: 10.19912/j.0254-0096.tynxb.2022-1412
Abstract140)      PDF (2178KB)(14)      
In this study, the comprehensive energy efficiency of bifacial photovoltaic vertical shading system is studied experimentally and theoretically. Firstly, a bifacial photovoltaic vertical shading power generation model based on EnergyPlus is established, and the accuracy of the model is verified through experiments. Then, combined with the energy consumption of air conditioning and lighting, a comprehensive energy efficiency model of bifacial photovoltaic vertical shading system is established. Finally, based on the verified model, the impact of climate conditions, overhang width and installation tilt angle on the comprehensive energy efficiency of the system is analyzed by using three evaluation indicators: net energy consumption ( Q NEC), self-consumption rate (SCR) and self-sufficiency rate (SSR). The results show that the net energy consumption decreases with the increase of the inclination angle, and the energy saving rate can reach 71.25% at the maximum. The variation tendency of self-satisfaction rate is basically consistent with photovoltaic power generation, and the trend of self-consumption rate is highly consistent with net energy consumption.
OPTIMAL DESIGN OF VERTICAL AXIS WIND TURBINE SPECIAL AIRFOIL BASED ON MULTI-OBJECTIVE GENETIC ALGORITHM
Zhang Qiang, Miao Weipao, Liu Qingsong, Chang Linsen, Li Chun, Zhang Wanfu
2023, 44 (4): 9-16.    doi: 10.19912/j.0254-0096.tynxb.2021-0610
Abstract137)      PDF (2340KB)(22)      
In order to improve the comprehensive aerodynamic performance of vertical axis wind airfoil, an airfoil optimization design method for multiple operating conditions was established. The CST parameterization method is used to characterize airfoil geometry shape. Through optimizing the Latin hypercube sampling method for space sampling, CFD method is used to calculate airfoil aerodynamic force, and establish the radial basis function (RBF) neural network surrogate model. Taking the optimal of airfoil lift under the small angle of attack and lift-to-drag ratio under small angle of attack as the optimal design target, adopts the multi-objective genetic algorithm optimization on the surrogate model, so as to obtain suitable dedicated airfoil for vertical axis wind turbines to improve its rotation torque under different tip speed ratios. Through optimization of the common airfoil NACA0018 for wind turbine, the results show that the lift coefficient and lift to drag ratio of a single airfoil are not only improved by taking the small angle of attack and the maximum angle of attack of lift to drag ratio as the optimization objectives, but also the torque coefficient of the whole airfoil can be improved when the optimized airfoil is applied to the vertical axis wind turbine.