基于耦合点定功率控制的微网频率调整  

Frequency Regulation of Microgrid Based on Definable Power Control at Point of Common Connection

作　　者：肖宏飞[1] 林艳艳[1] 戴鑫 陈磊磊 吴晨曦[1] 

机构地区：[1]杭州电子科技大学自动化研究所,浙江省杭州市310018 [2]浙江宇视科技有限公司,浙江省杭州市310051 [3]天地电研(北京)科技有限公司杭州分公司,浙江省杭州市310007

出　　处：《电网技术》2016年第4期1147-1154,共8页Power System Technology

基　　金：国家自然科学基金青年基金项目(51407052)~~

摘　　要：随着可再生能源发电技术的商用化及推广,微网系统在规模和数量上都得以发展,微网与公用电网的联合运行成为必然趋势。对微网频率控制问题进行了研究,提出以背靠背型换流器作为并网装置的微网频率控制策略,通过微网功率管理器实现调节功率的计算、修正及分配。提出滚动平均法、分段平均法用于调节功率的计算,从而调整微网DG出力恢复频差,实现耦合点的定功率控制。研究表明,在大幅阶跃扰动和小幅随机扰动下,所提频率控制策略均可维持微网系统的频率稳定,有效控制耦合点功率。Evolutionary changes have taken place in operational climate of traditional electric utilities. Emergence of microgrid systems has opened new opportunities for commercialization and popularization of renewable power generation technology. Connection of microgrids to utility has raised concern. This paper studies frequency control for microgrid with back-to-back converters as connection devices and proposes a new control strategy. Frequency control is realized through microgrid power management system（PMS）. A rolling average method and a segmental average method are proposed to calculate regulated power, which is further corrected and distributed among DGs. Power at PCC is maintained constant, making the microgrid to present itself to utility as a controlled unit. Simulation results show that the proposed strategy can effectively control microgrid frequency and stabilize power at PCC during step or random disturbance.

关 键 词：微网 耦合点 定功率控制 二次调频 滚动平均法 分段平均法 

分 类 号：TM72[电气工程—电力系统及自动化]