分布式光伏就地自适应电压控制策略研究

随着分布式光伏发电系统规模化、多点接入配电网,其对配电网的运行控制、调度管理等方面的影响也逐渐凸显,其中无功电压控制问题是较为显著的问题之一。分布式光伏发电系统的输出电能受到光照、气候等自然因素的影响,具有较强的随机性、间歇性与波动性,难以准确预测。另外,分布式光伏海量接入,难以对所有光伏额外整合测量设备和控制设备,部分光伏难以观测和控制。鉴于此,针对分布式光伏规模化并网场景,综合考虑并网分布式光伏的不可控和不可调度特性,提出分布式光伏就地自适应电压控制策略。针对配电网多种运行工况提出电压期望值自适应调整方案,进而采用就地的、智能的自适应方法来调节电压。利用PSCAD/EMTDC电磁暂态仿真平台,在多种仿真场景下仿真分析和比较了就地自适应电压控制策略的电压控制恢复效果,验证了所提电压控制策略的有效性和鲁棒性。

Research on local adaptive voltage control strategy based on distributed PV

As distributed photovoltaic systems (DPVS) connected to the distribution network, its associated influences on operation, control and dispatching management also gradually highlight, among them the reactive voltage control is one of the more significant problems. The power output of the DPVS is affected by the light, climate and other natural factors, which makes it have strong randomness and intermittent and volatility and be difficult to predict. In addition, it is hard to measure equipment and control equipment for each DPVS when huge number of DPVSs access to distributed network, thus parts of DPVSs cannot be observed and scheduled. In view of this, considering the unobservable and un-dispatching ability, a local adaptive voltage control strategy is proposed for the DPVS, correspondingly a voltage expectations adaptive adjustment scheme is proposed for various operation modes of distribution networks to achieve local voltage control in an intelligent and adaptive manner. Based on PSCAD/EMTDC electromagnetic transient, simulation results of many cases show the effectiveness and robustness of the proposed scheme.