摘要
分布式发电系统随着规模扩张,其并网后的电网适应性已成为一个核心技术问题,尤其是不同电网故障后如何对电网进行有效的电压支持。针对这个问题,本文提出一种分布式发电逆变器在电网故障时的柔性电压支持控制策略,该控制策略不同于传统的电网支持控制方案,其灵活性体现在若出现三相电压平衡跌落,则注入无功功率提高每相电压,若出现单相或者两相不对称故障,则尽量控制电压平衡,消除电压负序分量,减小相位突变。搭建了试验平台,对2种不同电网故障下的电压支持控制开展了试验研究,试验结果表明在新型柔性电压支持控制策略下,故障后的电网电压得到了有效的支持,控制策略得到了验证。
With the expansion of the scale of the distributed power generation system, its adaptability to the grid after grid connection has become a key technical problem, especially on how to perform effective voltage support to the grid after the fault in different grids. As for this issue,the flexible voltage support and control strategy of a kind of distributed power inverter at grid fault is proposed in this paper. The flexi- bility of the control strategy,unlike the traditional power grid support and control scheme,is reflected in the voltage improvement per phase by way of injecting reactive power in case of three-phase voltage balance sag,control of voltage balance,elimination of negative sequence component of voltage and red- uction of phase mutation in case of one phase or two-phase asymmetrical fault. The test platform is set up, and test research of voltage support and control at two types of power fault is developed. It is shown by the test result that at the support and control strategy of new type of flexible voltage the grid voltage is effectively supported after the fault and the control strategy is verified.
出处
《电力电容器与无功补偿》
北大核心
2016年第6期88-94,共7页
Power Capacitor & Reactive Power Compensation
基金
国家级自然科学基金(51477027)
关键词
分布式发电
逆变器
无功功率控制
电压穿越
电压跌落
电压支持
distributed generation
inverter
reactive power control
voltage ride through
voltage sag
voltage support
