电工技术学报2018，Vol.33Issue(6)：1400-1409,10.DOI:10.19595/j.cnki.1000-6753.tces.L70691
基于分层控制的微电网并网谐波电流主动抑制控制策略
An Active Harmonic Grid-Connecting Current Suppression Strategy for Hierarchical Control Based Microgrid
摘要
Abstract
Given that the droop controlled inverters based grid-connected microgrid (DCIGC-MG) presents low equivalent output impedance when connecting to the grid, the grid-connecting current (GCC) is distorted easily by the harmonic voltage components at the point of common coupling (PCC), and results in the increase of THDnof GCC. An active harmonic GCC suppression strategy for DCGC-MG based on hierarchical theory was proposed in this paper. Firstly, the voltage error between bus of DCGC-MG and PCC of grid was transferred to dq frame by the Park transformation. Then, an additional compensator consisting of multiple resonant voltage regulators was added into the secondary control to generate the harmonic voltage reference for inverters in the primary level. PI and multiple resonant controllers were adopted as voltage controller in the original primary level to improve the voltage tracking performance of inverter. As a result, the voltage difference between the PCC and system bus decreased, and the GCC is purified. The proposed control strategy not only reduces the steady-state hormonic current injected into the grid by the microgrid, but also suppressed the harmonic inrush currents when the microgrid connects to the distorted grid for protecting inverter. Finally, the simulation and experimental results from scaled-down laboratory prototype have verified the proposed control strategy.关键词
谐波电流/电压源逆变器/下垂控制/微电网Key words
Harmonic current/voltage source inverter/droop control/microgrid分类
信息技术与安全科学引用本文复制引用
冯伟,孙凯,关雅娟,Josep M.Guerrero,肖曦..基于分层控制的微电网并网谐波电流主动抑制控制策略[J].电工技术学报,2018,33(6):1400-1409,10.基金项目
国家高技术研究发展计划(863计划)(2015AA050606)和北京市科技计划(Z161100002616039)资助项目. （863计划）
