摘要
传统矢量控制策略下,提高电压源换流器VSC(voltage source converter)的无功输出会使并网点电压升高。为充分发挥VSC参与交流系统无功支撑的能力,同时保证良好的电能质量,提出一种直流电压补偿控制策略。该策略根据VSC的期望无功输出自适应调整直流电压幅值,使VSC在输出大量无功功率的同时,避免因PWM过调制造成的谐波含量激增。通过状态空间模型得出了直流电压补偿控制参数的可行域。基于Matlab/Simulink详细开关模型的仿真结果验证了该策略的有效性。
Under the traditional vector control strategy,increasing the reactive power output from a voltage source converter(VSC)will cause the increase in voltage amplitude at the point of common coupling(PCC).To maintain a satisfying power quality while giving full play to the VSC’s capability in participating the reactive power support for an AC system,a DC voltage compensation control strategy is proposed in this paper.Under this control strategy,the DC voltage magnitude is adaptively adjusted according to the expected reactive power output provided by the VSC,which can avoid a sudden increase in harmonic content due to PWM over-modulation as the VSC outputs a large amount of reactive power.The feasible region of DC voltage compensation control parameters is obtained through a state space model.The simulation results of a detailed switch model based on MATLAB/Simulink verify the effectiveness of the proposed strategy.
作者
王常安
刘俊勇
WANG Chang’an;LIU Junyong(College of Electrical Engineering,Sichuan University,Chengdu 610044,China)
出处
《电力系统及其自动化学报》
CSCD
北大核心
2023年第2期63-74,共12页
Proceedings of the CSU-EPSA
关键词
电压源换流器
无功输出能力
电能质量
PWM调制
直流电压补偿控制
经济性
voltage source converter(VSC)
reactive power output capability
power quality
PWM modulation
DC voltage compensation control
economy
