基于次梯度投影分布式控制法的虚拟电厂经济性一次调频

Economic Primary Frequency Control of Virtual Power Plant Applying Distributed Control Method Based on Sub-Gradient Projection

虚拟电厂(virtual power plant,VPP)是解决大量分布式电源(distributed generation,DG)接入电网调控运行的有效手段。分布式电源通过虚拟电厂参与电力系统的辅助服务市场,为电网提供调峰调频等辅助服务并从中获利,实现电网与分布式电源用户的双赢。文章在基于稀疏通信和点对点信息交互的全分布式协调控制方式的基础上,提出了基于次梯度投影分布式控制的虚拟电厂经济性一次调频方法,在保证自身运行成本最小化的前提下实现虚拟电厂的一次频率控制,提高了其并网友好性和对电网的频率支撑水平。相比传统下垂控制能够实现最优功率分配,避免竞争控制,相比一般分布式次梯度法能够更好地处理分布式电源功率限值的问题,并对通信时延具有较好的适应性。

Virtual power plant(VPP)is an effective means to solve the problem of regulation and operation of abundant distributed generation(DG)access to power grid regulation and operation.DGs’participation in the auxiliary service market of power system through VPPs,provides auxiliary services such as peak shaving and frequency regulation for power grid,and is benefited from them,to realize win-win between power grid and DG users.On the basis of fully distributed coordination control mode based on sparse communication and point-to-point information interaction,an economic primary frequency control method for VPP applying distributed control method based on sub-gradient projection is proposed.On the premise of minimizing its own operation cost of VPP,this method can improve its grid-connected friendliness and frequency support level for power grid.Compared with traditional droop control,this method not only achieves optimal power allocation,but also avoids competitive control,and can better deal with the power limit problem of DGs compared with the common distributed sub-gradient method.It also has better adaptability to communication delay.