基于主从控制的微电网电压质量改善策略
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TM464

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内蒙古自治区自然科学基金资助项目(2020LH05019)


Strategy for improving voltage quality of microgrid based on master-slave control
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    摘要:

    针对非线性不平衡混合负载易导致微电网母线电压质量下降的问题,文中利用并联在微电网母线上的多个逆变器对母线电能质量进行治理。以单台逆变器为例,对非线性不平衡混合负载造成逆变器输出电压质量下降的原因进行分析,并提出一种主从控制策略。主逆变器充当电压源,从逆变器充当电流源,利用从逆变器剩余可用容量来补偿负载中的谐波、负序电流分量,而负载中的基波电流和零序电流分量则由主从逆变器共同分担。该策略有效降低了逆变器输出侧电压的畸变率和不平衡度,将电能质量治理功能嵌入到从逆变器中,避免增加额外的电能质量治理装置,降低了系统成本。最后,在PSCAD仿真环境下搭建仿真模型验证了该控制策略的有效性和可行性。

    Abstract:

    To solve the problem of voltage distortion and unbalance caused by non-linear and unbalanced load, several inverters connected in parallel to micro-grid bus are used to control the bus quality. Taking a single inverter as an example, the causes of the output voltage quality degradation caused by the nonlinear unbalanced mixed load are analyzed. A master-slave control strategy is proposed, in which the master inverter acts as the voltage source and the slave inverter acts as the current source. The remaining available capacity of the slave inverter is used to compensate the harmonic and negative sequence current of the load, while the fundamental current and zero sequence current of the load are shared by the master-slave inverter. The control strategy effectively reduces the distortion rate and unbalance degree of the output voltage of the inverter, and embeds the power quality control function into the slave inverter, which avoids adding additional power quality control devices and reduces the system cost. Finally, the effectiveness and feasibility of the proposed control strategy are verified by building a simulation model in PSCAD environment.

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李彪,菅永,曹雪源,连勃,高超.基于主从控制的微电网电压质量改善策略[J].电力工程技术,2020,39(6):117-123

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  • 收稿日期:2020-05-13
  • 最后修改日期:2020-06-27
  • 录用日期:2020-09-21
  • 在线发布日期: 2020-12-01
  • 出版日期: 2020-11-28