基于二分法的本地控制改善含分布式电源配电网电压质量

Voltage performance improvement by dichotomy based local control for power distribution networks with distributed generation

为了改善含分布式电源配电网的电压质量并避免控制策略对通信系统的依赖,提出一种基于本地控制的分布式电源控制方法。根据分布式电源并网点的实时电压采集值,控制相应分布式电源的有功出力和无功出力适当增大或减小,结合控制效果并采用二分法反复调节控制量,最终将并网点电压控制在电压偏差允许范围内。在对分布式电源的本地控制中,在有功功率最大功率跟踪的前提下,优先利用逆变器的剩余容量进行无功功率调节,若仍不奏效再适当削减有功功率输出。密切监视分布式电源的运行环境,一旦条件允许则及时增大有功功率输出以最大限度地利用自然资源。以IEEE33节点的配电网为例,对所建议的方法进行了分析和验证。结果表明了所建议的控制方法的可行性和有效性,对含分布式电源配电网的电压质量的改善效果明显。

To improve the voltage quality of distribution network with Distributed Generations（DG） and make the control independent of the communication system, a local control approach of DGs is put forward. According to the voltage of PCC, the active and reactive power of the corresponding DG are regulated to increase or decrease, the regulation is committed repeatedly with the magnitude of control adjusted based on a dichotomy process so as to make the voltage of PCC of the corresponding DG within the restriction of voltage deviation. In the suggested local control process, the regulation of the reactive power based on the residual capacity of the inverter with MPPT is of priority. The active power of a DG is decreased properly when it is necessary. The condition is monitored in real time to increase the active power output of the DG in time so as to utilize the nature resources as much as possible. The IEEE-33 system is used as an example to verify the proposed control method, showing that its feasibility and the voltage quality of the distribution network with distributed generations can be improved effectively.