为探究影响多端直流系统稳定性的关键因素,针对电压源型换流器、直流线路、可再生能源和直流负荷等部分组成的低压三端直流系统,建立其相应的等效电路,并结合主从控制模式下各换流器控制策略,形成了系统整体的状态空间模型。其次,结合主导特征值对含可再生能源的低压多端直流系统进行小信号稳定性研究,对比分析不同参数变化时主导特征值的移动轨迹,进而确定换流器直流侧电容、控制器外环参数等影响系统稳定性的关键因素。在此基础上,基于Matlab/Simulink搭建含可再生能源的低压多端直流系统仿真模型,验证了理论分析的正确性。
Abstract
With the increasing growth of distributed renewable energy sources such as PV, wind power and energy storage, DC load, low-voltage multi-terminal DC system gradually becomes one of the main network forms of distribution system.To explore the key factors which influence the stability of multi-terminal DC system, this article establishes the corresponding equivalent circuit for a low-voltage three-terminal DC system consisting of voltage-source converter, DC lines, renewable energy and DC loads, combined with the control strategy of each converter in master-slave control mode, a state space model of the system as a whole is formed. Secondly, the small-signal stability study of the low-voltage multi-terminal DC system with renewable energy is carried out by combining the dominant eigenvalues, comparing and analyzing the trajectory of dominant eigenvalues when different parameters are changed, and then determining the key factors affecting the stability of the system, such as the DC-side capacitance of the converter and the outer-loop parameters of the controller. On this basis, a simulation model of low-voltage multi-terminal DC system with renewable energy is built based on Matlab/Simulink to verify the correctness of the theoretical analysis.
关键词
可再生能源 /
低压系统电压控制 /
控制器参数 /
小信号模型信号分析 /
主导特征值 /
主从控制
Key words
renewable energy /
voltage control /
controller parameters /
signal analysis /
dominant eigenvalue /
master-slave control
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基金
中国科学院洁净能源先导科技专项（XDA21050100）; 中国科学院青年创新促进会（2018170）; 中科院前沿科学重点研究（QYZDBSSW-JSC024）
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