中国电机工程学报2016，Vol.36Issue(22)：6086-6095,10.DOI:10.13334/j.0258-8013.pcsee.152442
不平衡与非线性混合负载下的虚拟同步发电机控制策略
A Control Strategy for Unbalanced and Nonlinear Mixed Loads of Virtual Synchronous Generators
摘要
Abstract
Voltage source inverters based on virtual synchronous generator (VSG) control are usually used for all kinds of distributed generation interfaces in a microgrid, but the voltage and frequency of the microgird can be deteriorated under unbalanced and nonlinear mixed loads when the utility fails. A voltage unbalance and harmonics compensation strategy for the VSG in islanded microgrids was proposed. Firstly, the VSG equivalent impedance model was built to illustrate the effect of the output impedance on the system power quality in a two-phase stationary reference frame (αβ- SRF). Besides, a cascaded general-integrator (CGI) scheme was proposed to implement the virtual impedance to improve the compensation effect, which can avoid performing the time derivative function of output currents and increasing the dynamic response speed of the system significantly. Furthermore, the PI plus multi-resonant (PIR) voltage controller was used to compensate for the unbalanced and distorted output voltages of the VSG. Finally, the proposed strategy was demonstrated in detail and validated with a two 100-kVA VSGs parallel system under unbalanced and nonlinear loads.关键词
虚拟同步发电机/混合负载/虚拟阻抗/不平衡电压抑制/谐波电压抑制Key words
virtual synchronous generator (VSG)/mixed load/virtual impedance/unbalanced voltage compensation/harmonic voltage compensation分类
信息技术与安全科学引用本文复制引用
石荣亮,张兴,刘芳,徐海珍,胡超,余勇,倪华..不平衡与非线性混合负载下的虚拟同步发电机控制策略[J].中国电机工程学报,2016,36(22):6086-6095,10.基金项目
国家863高技术基金项目(2015AA050607)；国家科技支撑计划资助项目(2014BAA04B02)。The National High Technology Research and Development of China 863 Program (2015AA050607) （2015AA050607）
Project Supported by National Science and Technology Support Program (2014BAA04B02) （2014BAA04B02）
