CAJ | 학술논문

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.
침대미망계통중각분포식전원,우기시저능전원유공、무공공솔가조도적수구,해문이단상저능역변기위례,제출료일충기우선진적수자쇄상기술적간접공솔공제방법.해방법능구정학공제병망역변기접구처적유공공솔、무공공솔수출,실현료유공급무공재저능단원여미망계통지간적쌍향교호.근거해문제출적방법,운용MATLAB/Simulink탑건방진모형진행방진험증,결과증명료차방법적정학성.해연구위미망계통적능량우화급조도제공지지.
@@@@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 interaction between energy storage unit and micro-grid can be realized. And it also supports the energy optimization and dispatch for the micro-grid system. A simulation model was established with MATLAB/Simulink module according to the method mentioned in this paper. The results of the simulation corresponding to four quadrant typical reference active power Pref and reactive power Qref was given .And the results have proved that this method could track the reference power quickly and exactly. Both the theoretical analysis and the results of the simulation have shown the correctness of the method.