大方式下省地电网无功电压实时趋优控制方法

针对大方式下省地两级电网的无功电压调控需求难以同时兼顾的问题,指出了省地电网无功电压调控失配的一种表现形式——220kV变压器中压侧电压调控失配,提出了一种新的失配风险评估模型,增加了变压器中压侧电压调控失配的判据。据此制定了相应去失配策略,避免了因地调无功电压调控手段配合不当而导致的变压器中压侧电压调控失配问题。进而提出了省地电网无功电压实时趋优控制方法,以兼顾省地电网无功电压调控需求为控制目标,以关口无功、关口电压和变压器中压侧电压为控制特征参数,在不依赖于全网精确严格的优化计算的前提下,实现省地两级电网无功电压调控状态的实时趋优。应用到某区域电网的仿真结果表明,所述方法不仅能够实现系统运行的经济性和安全性的统一,而且具备控制实时性和可靠性高的优点。

Real-time Slack Optimal Method for Voltage and Reactive Control Between Provincial and Prefectural Power Networks in Heavy Load Flow Mode

It is difficult to meet both the voltage and reactive control demands between provincial and prefecture power networks in extreme heavy load flow mode. The voltage mismatch of middle voltage side of the transformer is proposed as a form of the mismatching of voltage and reactive control between provincial and prefectural power networks. A new model to evaluate the mismatch risk is proposed and the voltage mismatch criterion is considered in this model. An anti-mismatching strategy is proposed to avoid the mismatch of control measures in the prefectural dispatch center. A real-time slack control optimal method is proposed to meet both the voltage and reactive control demands between provincial and prefectural power networks. With this method, the getaway reactive power, getaway voltage and voltage of the middle voltage side of the transformer are taken as control parameters to realize real-time slack optimization of the running state of power system without the reactive power optimization of the whole network. Simulation results of applying the proposed method to a certain regional power grid show that the proposed method not only has the advantage of real-time and high reliability, but can ensure security and economics of the power system.