孤岛微电网电压谐波补偿及电流均衡控制策略
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摘要
孤岛微电网由于接入大量非线性负荷,导致微电网易出现电压谐波现象,以及谐波电流因线路阻抗各异无法按分布式电源(DG)容量比例分配问题。为此,提出一种采用分层协同控制策略以实现电压谐波补偿及谐波电流均衡控制的方法。在分布式二次控制中,通过与邻域节点交换各主要次谐波电流和谐波畸变率信息,采用一致性算法获得全网的谐波电流和电压谐波畸变率平均值,自适应调节功率下垂控制的电压谐波补偿参考值,以实现电压谐波补偿和谐波电流均衡协同控制。最后,通过仿真和实验结果验证了所提控制策略的有效性和可行性。
Due to the large number of non-linear loads connected to the island microgrid,it is prone to occur the voltage harmonics, and harmonic current can not be allocated according to the distributed generation(DG) capacity of distributed power source due to different line impedance.To solve this problem, a hierarchical cooperative control strategy is proposed to realize voltage harmonic compensation and harmonic current sharing control.In the distributed secondary control, through the exchange of major sub-harmonic current and harmonic distortion rate information with neighboring nodes, a consensus algorithm is used to evaluate the global average of the harmonic current and the voltage harmonic distortion ratio, and adaptive regulates voltage harmonics to compensate for reference values of power droop control to achieve voltage harmonic compensation and harmonic current sharing control.Finally, the feasibility and effectiveness of the proposed control strategy are verified by simulation and experimental results.
Due to the large number of non-linear loads connected to the island microgrid,it is prone to occur the voltage harmonics, and harmonic current can not be allocated according to the distributed generation(DG) capacity of distributed power source due to different line impedance.To solve this problem, a hierarchical cooperative control strategy is proposed to realize voltage harmonic compensation and harmonic current sharing control.In the distributed secondary control, through the exchange of major sub-harmonic current and harmonic distortion rate information with neighboring nodes, a consensus algorithm is used to evaluate the global average of the harmonic current and the voltage harmonic distortion ratio, and adaptive regulates voltage harmonics to compensate for reference values of power droop control to achieve voltage harmonic compensation and harmonic current sharing control.Finally, the feasibility and effectiveness of the proposed control strategy are verified by simulation and experimental results.
引文
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[4]乔和,关紫微,苏佰超,等.非理想电网下级联信号延迟对消锁相方法研究[J].电力电子技术,2016,50(5):105-108.
[2]曾正,赵荣祥,杨欢,等.多功能并网逆变器及其在微电网电能质量定制中的应用[J].电网技术,2012,36(5):58-67.
[3]王鹤,李国庆,李耀峰.多逆变型分布式电源协调的微电网谐波控制方法[J].电力系统自动化,2014,38(23):33-39.
[4]乔和,关紫微,苏佰超,等.非理想电网下级联信号延迟对消锁相方法研究[J].电力电子技术,2016,50(5):105-108.