摘要
针对微电网孤岛运行模式,传统分布式电源网侧逆变控制策略对微电网频率变化响应不足,分别提出微电网整流与逆变的新型控制策略。分析微电网频率变化下分布式电源的暂态特性,设计一种改进的分布式电源发电侧控制策略,保证分布式电源直流母线电压稳定。变换器网侧采用基于虚拟同步发电机控制策略,并对励磁电流进行补偿,协助孤岛电网频率恢复稳定。用PSCAD/EMTDC对分布式发电系统进行了建模仿真,验证了所提控制策略的有效性和可靠性。研究结果实现了分布式电源在微电网频率变化下的及时响应,所提控制策略对微电网频率波动具有较好的抑制作用。
Against island operation mode of micro-grid, traditional grid-side control strategy of distributed generator is difficult to meet the needs with micro-grid frequency change, and new control strategies of rectifier and inverter of micro-grid were proposed transient characteristics of distributed generators were analyzed with micro-grid frequency change. An improved generate-side inverter control strategy of distributed generator was posed to stabilize the DC bus voltage. Grid-side control strategy is based on the virtual synchronous generator, and the field current is compensated to assist island grid frequency with restoring stability. Distributed generation system was modeled and simulated by PSCAD/EMTDC, and validity and reliability of the proposed control strategy are verified. The results realized timely responses of distributed generators with micro-grid frequency change. The bias of grid frequency is significantly reduced through the proposed control strategy.
出处
《电气传动》
北大核心
2015年第8期32-35,40,共5页
Electric Drive
基金
山西省教育教学改革项目(J2012113)
关键词
分布式电源
微电网
虚拟同步发电机
下垂控制
频率变化
distributed generator（DG）
micro-grid
virtual synchronous generator
droop control
frequency change
