风电机组控制参数设置不当会引起风电机组阻尼变弱而发生自由振荡。为采取合理措施抑制风电机组的振荡,需要研究风电机组控制参数对机组阻尼的影响机理。以直驱风电机组为例,首先计及锁相环控制的比例系数Kppll和积分系数Kipll、网侧变流器内环控制的比例系数Kp1和积分参数Ki1,推导直驱风电机组暂态能量函数,分析不同控制参数对机组暂态能量及阻尼的影响机理;定义机组耗能功率及阻尼影响因子,定量分析不同控制参数对机组阻尼的影响;最后,在PSCAD/EMTDC平台上建模分析,通过耗能功率的变化深入分析控制参数对机组阻尼的影响。仿真结果表明,一定范围内变流器控制参数减小,直驱机组耗能功率增大,阻尼变弱;锁相环控制参数增大,机组耗能功率增大,阻尼变弱;控制参数Kp1、Ki1、Kppll、Kipll单位变化率相同时,对机组阻尼的影响按照从大到小的顺序为Ki1、Kp1、Kppll、Kipll。
Abstract
Improper setting of wind turbine control parameters can cause the damping of the wind turbine to weaken and cause free oscillation. In order to take reasonable measures to suppress the oscillation of wind turbines, it is necessary to study the mechanism of the influence of wind turbine control parameters on unit damping. Taking a direct-drive wind turbine as an example, firstly, taking into account the proportional coefficient Kppll and integral coefficient Kipll of the phase-locked loop control, the proportional coefficient Kp1 and integral parameter Ki1 of the internal loop control of the grid side converter, the transient energy function of the direct-drive wind turbine is derived, and the influence mechanism of different control parameters on the transient energy and damping of the unit is analyzed; Define the energy consumption power and damping influencing factors of the unit, and quantitatively analyze the impact of different control parameters on the damping of the unit; Finally, model and analyze on the PSCAD/EMTDC platform, and deeply analyze the impact of control parameters on unit damping through changes in energy consumption power. The simulation results show that within a certain range, the control parameters of the inverter decrease, the energy consumption power of the direct drive unit increases, and the damping weakens; As the control parameters of the phase-locked loop increase, the energy consumption power of the unit increases, and the damping weakens; When the unit change rates of control parameters Kp1,Ki1,Kppll,and Kipll are the same, the impact on unit damping is in descending order of Ki1,Kp1,Kppll and Kipll.
关键词
风电场 /
稳定性 /
控制 /
暂态能量函数 /
阻尼特性
Key words
wind farm /
stability /
control /
transient energy function /
damping characteristic
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基金
山东省自然科学基金（ZR2016EEM13）; 国家电网有限公司总部科技项目（XTB17201800166）：“基于多沙堆理论的互联电网停电事故预警技术及系统研发”; 国家电网有限公司总部科技项目（5100-202155482A-0-5-ZN）：“基于总体国家安全观的大停电事件全链条演化机理与战略防御框架研究”
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