基于数字锁相环的储能逆变器并网功率控制方法  

Control of grid-connected power for energy storage inverters based on digital phase-locked loop

作　　者：孙钦斐[1] 杨仁刚[1] 周献飞[1] 王文成[1] 何恩超 侯元文[3] 

机构地区：[1]中国农业大学信息与电气工程学院,北京100083 [2]天津市三源电力设备制造有限公司,天津300409 [3]河南济源供电公司,济源454650

出　　处：《农业工程学报》2013年第A01期138-142,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家高技术研究发展计划"863计划"资助项目(2012AA050217)

摘　　要：针对微网系统中各分布式电源,尤其是储能电源有功、无功功率可调度的需求,该文以单相储能逆变器为例,提出了一种基于先进的数字锁相技术的间接功率控制方法。该方法能够精确控制并网逆变器接口处的有功功率、无功功率输出,实现了有功及无功在储能单元与微网系统之间的双向交互。根据该文提出的方法,运用MATLAB/Simulink搭建仿真模型进行仿真验证,结果证明了此方法的正确性。该研究为微网系统的能量优化及调度提供支持。Micro-grid has been becoming a focus all over the world because of its advantages. Usually, energy storage unit plays an important role and battery storage inverter is an integral part as a result. While a micro-grid running in grid-connected mode, it’s necessary to control the power at the point where the inverter joined to the grid. So far, there are two main kinds of strategies for the grid-connected power control： （1） closed-loop control for active and reactive power respectively; （2） closed-loop control for the active and reactive component of the grid-connected current. These methods require calculation of the active and reactive power or active and reactive component before closed-loop control. And the calculation usually is very complex, which lead to slow response. In grid-connected mode, the voltage of the storage inverter will be clamped by the grid. It means the power will be determined by the grid-connected current. As a result, the power can be controlled by indirect control of the grid-connected current. With the background mentioned above, a new strategy of power control for single phase battery storage inverter, based on advanced phase-locked loop, was proposed in this paper. The phase angle and RMS value of the current was used to control the active and reactive power instead of common methods, which use direct power feedback control strategy in this method. Comparatively, this strategy could accelerate the response without complex calculation. The detailed theoretical analysis for the strategy was presented in the paper. Firstly, an introduction for an advanced phase-locked loop method was given this paper. This method could lock the voltage on the grid, which will be the premise for the power control. Then, the detailed step getting the reference phase angle and RMS value of the current was introduced. With this strategy presented, it can control the active and reactive power at the interface of the inverter accurately. As a result, the requirement for power’s bi-directional inte

关 键 词：电 功率控制 储能 变器 数字锁相 并网 

分 类 号：TM926[电气工程—电力电子与电力传动]