负荷频率变化时IPC及其两侧电网的动态行为

DYNAMIC BEHAVIOR OF IPC AND POWER SYSTEM ON BOTH SIDES CONSIDERING THE VARIATION OF LOAD FREQUENCY

研究了负荷频率变化时,相间功率控制器(IPC)及两侧电网的动态行为,着重探究了带IPC联络线的两侧电网是否会轻易地在负荷频率变化时落入异步运行状态。建立了研究这一特殊问题的数学模型,该模型将计及两侧频率差异的动态潮流、IPC电压电流基本方程与电网跟踪等值技术三者适当地结合,为突破技术难点铺平道路。以实际联网为背景的研究结果表明,在IPC联络线两侧电网负荷常规变化的条件下,并不会因频率变化步调上的差异,由较明显的相位相对滑移,轻易地转入异步运行状态。文中指出,运行工作点处于P-d 曲线适应性区段时,带IPC联络线的功率变动能适应两侧电网负荷需求上的变化,同时两侧电网能以较小的频差平稳地运行。

This paper studies the dynamic behavior of both sides network and IPC, when the load and frequency vary. Whether both sides of the tie line with IPC are easy to fall into the state of asynchronism is explored emphatically. The dynamic load flow with frequency difference, the basic equations of voltage and current of IPC, and the tracking equivalent technology of network are combined for a special mathematical model to break through the technical difficulty. On the background of practical interconnected network, the research results show that the state of the relative phase slippage can not easily be turned into asynchronous state because of the difference of the frequency variable step, while the loads of the two sides normally vary. It is indicated that the power variety of tie-line with IPC can adapt to the change need of network load ,and that both sides of interconnected network can run placidly with small frequency difference, if the operation point lies on the adaptability section of the P-d curve.