微型燃气轮机的并网控制仿真与分析

Simulation and Analysis of Grid-Connected Control of Micro-Turbine

摘要: 本文对微型燃气轮机并网系统的仿真与建模进行研究。选用综合控制方式对微网并网进行控制，对相关的参数进行了设定。对开关K5 (PCC)处的电流、各个DG输出有功功率、各个DG输出无功功率、母线上电压幅值、微电网系统频率变化情况进行了仿真分析。仿真结果表明，当微电网在并入到主电网的时刻，其冲击电流的产生，可能是处于孤网运行状态时的微电网频率与主电网的频率之间略有差异等原因造成。主电网在向微电网输送有功功率，同时也说明了由于DG2、DG3采用Droop控制方式，因而可以通过合理地调节输出功率，为微电网提供电压以及频率支撑。Droop控制中的Q-U解耦控制(目的为微电网提供电压支撑)，则母线的电压幅值会有相应的增加。Droop控制中的P-f解耦控制(目的为微电网提供频率支撑)，则微电网系统频率会相应上升。

Abstract: In this paper, the simulation and modeling of micro-turbine grid-connected system are studied. Selection of integrated control mode for the control of the micro-network and the relevant parameters were set. The simulation results show that the current at the switch K5 (PCC), the output power of each DG output, the reactive power of each DG output, the voltage amplitude on the bus and the frequency of the microgrid system are simulated and analyzed. When the microgrid is incorporated into the main grid, the reason for its inrush current may due to a slight difference between the frequency of the microgrid and the frequency of the mains in the orphan operation. The main power does not only line in the transmission of active power to the micro-grid, but also show that DG2, DG3 using Droop control can be adjusted by the reasonable output power for the micro-grid to provide voltage and frequency support. The Q-U decoupling control in the Droop control (which provides the voltage support for the microgrid), the voltage amplitude of the bus will increase accordingly. Droop control in the P-f decoupling control (the purpose of micro-grid to provide frequency support), the micro-grid system frequency will rise accordingly.