基于S函数的分布式电网并网方法仿真研究  

A Simulation Study on the Connection of a Micro-distributed Generation with the Grid

作　　者：罗建中[1] 吴政球[1] 骆君[1] 鲍鑫[1] 

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《计算机仿真》2010年第4期284-288,共5页Computer Simulation

摘　　要：以燃气内燃机驱动的同步电机作为分布式电源,对小型孤岛分布式微型电网并网进行了研究,根据同步电机的四阶基本方程提出利用PI控制方法,将频率和相位差反馈到励磁电压,对其进行励磁控制,以改变分布式孤岛微型电网的频率与相位,使孤岛微型电网与大电网近似满足并网条件。在不能调节分布式电源有功增加孤岛微电网频率的情况下,在不切除负荷、不中断供电的情况下,采用上述方法。通过励磁控制,能够降低微电网电压,减少负荷消耗功率,提高微网频率。在MATLAB中编写S函数进行仿真,可以证明在保持原动机功率不变的情况下,调节PI参数,可使孤岛微型电网与无穷大电网的频率和相位保持一致。结果验证了方法的可行性。The connection operation of small islanded micros - grid network is studied for the distributed genera- tion （DG） units with small energy source, such as synchronous machines driven by combustion engines. Based on the four - order basic equation of the synchronous machine, using PI control, the frequency and phase difference are fed back to the excitation voltage to change the frequency and phase between the micro - distributed generation and the infinite grid. If the active power of DG can not be adjusted to increase the frequency of the islanded micro - grid without curtailing the load and interrupting power supply, the proposed method can be used to reduce the DG＇s volt- age and the load power, on the other way, it can adjust the DG＇s frequency and phase angle, which is the main ad- vantages of the proposed method. The simulations by the S funciton in the MATLAB show that by choosing PI param- eters, the frequency and phase of the Island mini - grid can be kept the same as that of the infinite grid while the out- put of the generator governor is kept unchanged. Results validate the feasibility of the method.

关 键 词：发电机并网 机电暂态模型 励磁 仿真 函数 

分 类 号：TM619[电气工程—电力系统及自动化]