The stability of the isolated grid with high penetration of renewable energy sources is becoming more and more serious. This paper studies the control strategy of stabilizing the fluctuation of renewable energy by high energy consumption load based on an actual industrial power system in the east of Mongolia. The model of a coupling relationship between active power consumed by electrolytic aluminum and DC voltage is built. The control strategy of using static var compensator (SVC) to adjust the voltage to change the active power of the aluminum load is proposed based on the voltage regulation principle of SVC. The primary frequency modulation of the thermal power unit is fully considered in the control strategy. The adjustment ability of the load is deeply excavated so that the fluctuation of wind power can be offset effectively. A calculation method of compensation capacity of SVC is proposed, which can provide capacity reference of SVC for the actual site installation. The simulation model is built on the RTDS,and the power system can maintain stability in the case of high or low permeability and extreme fluctuation of wind power, which verifies the effectiveness of the proposed control strategy.%高渗透率的可再生能源接入使得孤立电网的稳定性问题日益突出.文章以蒙东某实际工业电力系统为例开展了高耗能负荷平抑可再生能源发电波动的控制策略研究.首先,建立了电解铝负荷消耗功率与直流电压的耦合关系模型.其次,基于静止无功补偿器(static var compensator,SVC)的调压原理,提出了利用SVC电压调整实现电解铝负荷调节的控制策略.所提控制策略在考虑火电机组一次调频的基础上,深度挖掘了负荷调节能力,有效平抑孤立电网中风电的有功波动.同时提出了一种SVC补偿容量的计算方法,为实际现场装设SVC提供容量参考.最后在RTDS (real time digital simulator)上搭建仿真模型,在风电高、低渗透率以及风电极端波动的情况下系统都能维持稳定,验证了所提出的控制策略的有效性.
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