王逸超 欧明勇 陈仲伟 马伏军

摘   要：为了满足新能源电站的无功需求，提出了一种LC串联滤波型变换器. 以三相380 V/30 kW并网变换器为例，相比传统的L和LC型滤波器结构，所提变换器结构能够在保持变换器输出无功功率能力的同时，降低系统直流工作电压约为原变换器的71%，释放了系统12%的有源容量，同时效率相比原滤波结构有6%的提升. 此外，基于LC变换器的离散状态模型，提出了一种基于LC串联滤波器型变换器的状态控制方法，有效地提升了LC串联滤波器在谐振频率处的系统阻尼.最后在PSIM中搭建了LC型变换器的仿真模型，验证了LC滤波型变换器的优势和状态反馈控制策略的可行性.

关键词：储能变换器;LC串联滤波;状态反馈控制;PR控制

Abstract：In order to meet the reactive power demand of new energy power stations， an LC series filter converter is proposed in this paper. Taking the three-phase 380 V / 30 kW grid converter as an example， compared with the traditional L and LC filter structure， the proposed converter structure can reduce about 71% of the original converter system DC voltage and release 12% of  the active capacity while maintaining the converter output reactive power capacity. And the efficiency is improved by 6% when compared with the original filter structure. In addition，based on the discrete state model of LC converter， a state control method based on LC series filter type converter is proposed， which effectively improves the system damping of LC series filter at the resonant frequency. Finally， a simulation model of LC converter is established in PSIM to verify the advantages of LC filter converter and the feasibility of the state feedback control strategy.

Key words：energy storage converter;LC series filtering;state feedback control;PR control

随着国家大力倡导新能源的发展，越来越多的电力电子装置接入大电网. 分布式发电的大量渗透，严重损害了配电网的电能质量，产生了一系列的负面影响. 如：电流的剧烈变化引起的瞬变;发电机有功和无功功率变化引起的长时间电压变动;谐波频率范围扩大甚至产生谐振等[1-4].

针对以上问题，文献[5]采用多台APF并联运行来抑制微网谐波问题. 文献[6]提出了APF、SVC联合运行的方式完成系统的无功补偿和谐波治理，保证了分布式电源系统并网的可靠性. 文献[7-8]则提出可以通过静止同步补偿器（STATCOM）动态地向电网注入感性或容性无功功率，快速抑制电压扰动，适用于风电场的无功补偿. 文献[9-12]则指出微电网中可以通过微电源……