含多种分布式电源的微电网分层控制策略

Hierarchical control strategy of micro-grid with different distributed generation types

随着分布式电源接入微电网数量的增加,微电网系统的稳定性受到了很大的影响;微电源的运行特性及控制方法、微电源的接人点和容量、微电网运行方式和控制方法、电力电子装置、储能设备和负荷特性等都会影响到电能质量。为了改善微电网的电能质量,提出了包括上层中心控制器及下层分布式电源信息交互的微电网分层控制策略。微电网中的分布式电源控制由下垂控制、功率控制、电压和电流控制组成。通过Matlab/simulink仿真,对微电网运行中各分布式电源的功率、电压和频率的变化规律进行了分析。仿真结果表明:分层控制策略能使各分布式电源之间较好地协调,满足了改善电能质量的要求。

The stability of micro-grid system is significant influenced with the increase in the numberof micro- grid interconnected with distributed generation. The power quality of the grid could beaffected by several factors such as the operation characteristics and control method, connection pointand capacity of micro-generation, operation mode and control method of the micro-grid, as well aspower electronic devices, energy storage devices, and load characteristics. To improve power quality ofthe micro-grid, the hierarchical control strategy is proposed including the upper center controller andthe lower information interaction of distributed generation. Distributed generation control in microgridis consisted of the droop control, power control, voltage and current control. By the simulation ofMatlab/simulink, analyzes the changing laws of power, voltage and frequency of each distributedgeneration in the operation of micro- grid. The simulation result shows that hierarchical controlstrategy makes better harmony among each distributed power, meet the demands of improving thequality of power energy.