电气弹簧双环解耦控制及有效运行范围研究

Research of the Electric Spring about Dual-Loop Decoupling Control and Effective Operation Range

电气弹簧(ES)是一种应用于负载侧的变流器装置,和非关键性负载组成智能负载调节负载功率稳定关键性负载电压,其主要应用于存在大量新能源的分布式系统,解决新能源的间歇性和不稳定性所带来的问题。该文首先介绍电气弹簧的应用背景和基本运行原理,然后针对电气弹簧能够调节电压的机理进行理论分析。随后分析已有控制方法的不足,并提出基于同步多旋转坐标系下的双环解耦控制方法,该方法能够使电气弹簧的直流侧电压和关键性负载电压都能稳定在给定值,具有解耦的效果。最后根据单相电气弹簧在系统中的电路模型,推导出关键性负载电压和其他电路参数的关系式,用Matlab分析得出非关键性负载、关键性负载和网侧电源电压对电气弹簧有效运行范围的影响。并且搭建实验平台,分别对电气弹簧工作在容性模式和感性模式两种情况下提出的控制方法进行验证,证明了控制方法的正确性和有效性。

Electric Spring, a converter applied in load side, forms the smart load with the noncritical load to regualte load power consumption and stabilize the critical load voltage. It is mainly embeded in the distributed power systems with large amounts of renewable energy sources, and can effectively deal with the issues resulting from the intermittency and instability of renewable energy source. In this paper, the application background and the basic operation principle were introduced firstly. Moreover the theoretical analysis of the reason why the electric spring can adjust the voltage was carried out. Then the shortcomings of the existing control method were introduced. A control method based on the synchronous rotating coordinate system was proposed, which can make the DC-side voltage of ES and the critical voltage stabilize at the reference value and has the decoupling effects. Finally according to the circuit model of single-phase ES in the system, the equation about the relationship between the critical load voltage and other circuit parameters was derived. The influence of noncritical load and supply voltage on the effective operation range of the ES was analyzed through the Matlab. And the experimental platform was also set up to verify the proposed control method under the capacitive mode and the inductive mode respectively, which proved the correctness and effectiveness of the control method.