可消除无功振荡的分布式电源本地电压控制策略

Local Voltage Control Algorithm for Distributed Generators with the Ability to Eliminate Reactive Power Oscillation

为了消除分布式电源本地电压控制中潜在的无功振荡,提出了一种新的本地电压控制策略,并给出了相关控制参数的整定方法。首先,分析了分布式电源本地电压控制中无功振荡的特点,在此基础上引入阻尼系数和缓冲系数,提出了一种新型分布式电源的本地电压控制策略。然后,给出了阻尼系数和缓冲系数整定方法,分析了阻尼系数与控制系统稳定性的关系,并且基于蒙特卡罗模拟法提出了阻尼系数的选取方法。以IEEE 33测试系统为算例,验证了所提出方法的有效性。算例结果显示,阻尼系数和缓冲系数的选取可以显著影响控制系统的稳定特性,合理选取控制系统参数有利于提高本地电压控制系统的控制性能,不合理的参数有可能使系统一直处于振荡状态。

In order to eliminate the reactive power oscillation underlying the local voltage control of distributed generation, we proposed an innovative algorithm for local voltage control, and investigated a method to select control parameters.First, the relationship between the adjustment of power and voltage was analyzed, and the features of control objective and controlled variables were investigated. Based on the introduced damping factors and buffer factor, a novel local voltage control strategy was proposed. Then, the set-up method of damping factors and buffer factor was presented, where buffer factor were given with the relationship to the maximal voltage fluctuation, and the damping factors were obtained from the Monte Carlo simulation. Moreover, the IEEE 33-Bus system was applied to verify the proposed local voltage control strategy. The numerical test results show that damping factors and buffer factor tend to impact the convergence of the control system. Meanwhile, choosing control parameters reasonably is capable of improving the performances of the control system, and unreasonable parameters may lead to oscillation.