摘要
能够集成有功发电、无功补偿和谐波抑制功能的分布式光伏并网发电系统对改善电网末端地区的供电质量、增加供电可靠性有重要作用。针对传统解耦控制对网络参数敏感的缺陷,旨在提出一种改进的光伏发电并网功率控制策略,即直接控制。该方法考虑了RLC滤波器的阻尼问题,根据分布式光伏发电的并网功率模型得到其运行区域图,并确定运行表,然后参照并网点电压从运行表中选择合理的运行点及对应的控制参量,对输出的有功、无功功率实现直接、统一控制,从而起到调节电网电压的作用。算例表明,直接控制方法原理清晰、控制简便,对配电网供电质量能起到较大的改善作用。
When integrated with the function of active power output, reactive power compensation and harmonic suppression, a distributed grid-tie photovoltaic （PV） generation system is helpful to improve electricity quality at the end of the network, and to enhance power supply reliability. In allusion to defects of traditional decoupling control which is sensitive to network parameters, an improved PV grid-tie power control strategy was introduced, that is the direct control method. In this method, the damp problem of RLC filter was analyzed. The principle of the direct control could be explained as follows. Based on PV grid-tie power model, its working area could be got. Then the operation chart is made, and from which proper working point and corresponding control parameters can be decided according to the actual network voltage. Therefore, output active and reactive power is controlled directly and simultaneously, and the function of regulating network voltages is realized. An example was given to validate that the direct control method is clear in principle, simple in control. It has a good effect on improving power supply quality of the distribution network.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2011年第10期6-11,共6页
Proceedings of the CSEE
关键词
光伏
分布式发电
直接控制
RLC滤波
无功
补偿
并网功率控制
photovoltaic （PV）
direct control
RLC filter
reactive grid-tie power control distributed generation
power compensation
a
