分散光伏并网系统参与电压无功调节的控制策略研究  

STRATEGY RESEARCH OF VOLTAGE REACTIVE POWER OPERATION INVOLVED WITH DISTRIBUTED PV SYSTEM

作　　者：贾清泉[1] 祁希萌 宁思远 于浩[1] 宫龙威 

机构地区：[1]电力电子节能与传动控制河北省重点实验室(燕山大学电气工程学院),秦皇岛066004

出　　处：《太阳能学报》2015年第12期2954-2960,共7页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51177142)

摘　　要：针对光伏和负荷功率波动导致的并网点电压越限和功率因数低下问题,在深入分析光伏系统并网点电压特性的基础上,提出一种电压-功率因数控制策略。控制策略按具体控制需求把光伏逆变器的运行设定为电压调节和功率因数调节两种工作模式,并按照系统所处的7种不同状态使逆变器在两种工作模式下切换运行。在此控制策略下,光伏系统实时响应并网点电压和功率因数的变化,动态分配光伏逆变器的有功、无功输出,保证光伏并网点电压在要求范围内,并最大程度地改善线路功率因数水平。算例结果验证了控制策略的有效性。In order to improve the situation of out-of-limit voltage and low power factor at grid-connected point caused by grid-connection of PV system and power change of load, a voltage-power factor control strategy was proposed base on analyzing the voltage characteristics of grid-connected point of PV power system. According to the specific control requirement, the operation of the PV inverter was set as voltage adjustment work mode and power factor adjustment work mode by the control strategy. According to the seven different states, the inverter was switched to operate in the two work modes. Under this control strategy, the PV system responded real-time the change of voltage and power factor at grid- connected point and distributed the active and reactive power output of the PV inverter dynamically. It ensured the voltage fluctuates within the permitted range and improved best the line power factor levels. The effectiveness of the proposed control strategy was verified by case study results.

关 键 词：光伏系统 高渗透率 电压越限 功率因数 电压-功率因数控制策略 工作模式 七区图 

分 类 号：TM743[电气工程—电力系统及自动化]