西北电网风电与光伏紧急功率控制系统设计

Design of a wind power and photovoltaic emergency power control system for Northwest China Grid

我国已形成新能源基地集群通过特高压直流群外送格局,新能源消纳受直流送电能力和新能源并网功率约束。为提高新能源消纳能力,区别于传统的馈线刚性切除控制,首先分析了利用新能源(风电、光伏)逆变器的快速控制特性,将新能源功率控制纳入电网紧急控制的必要性。新能源功率控制可有效降低冲击,提高控制精细水平,实现有功和无功解耦控制能力。其次针对新能源设备控制、通信现状和有功、无功控制能力,研究将新能源纳入紧急控制的通信时延和可控功率实时感知的技术需求,设计了系统架构,研究了适用场景,并提出了具体的实现方法及相应的控制策略。最后基于实际电网,仿真验证了所提控制架构和控制方法的有效性,其能够有效提高直流送电能力和新能源并网功率。

China has formed a cluster of renewable energy bases through the UHV DC group delivery mode,and the renewable energy consumption is constrained by the DC power transmission capacity and the new energy grid-connected power.Firstly,in order to improve the ability to absorb new energy and distinguish it from the traditional rigid cut-off control of the feeder,the necessity of using the rapid control characteristics of new energy(wind power,photovoltaic)inverters to incorporate new energy power control into the emergency control of the grid is analyzed.New energy power control can effectively reduce the impact,improve the fine level of control,and realize the decoupling control ability of active and reactive power.Secondly,for new energy equipment control,communication status and active and reactive power control capabilities,the technical requirements for including new energy in emergency control communication delay and controllable power real-time sensing are studied,the system architecture is designed,the applicable scenarios are studied,and the application scenarios are proposed.The specific implementation methods and corresponding control strategies are presented.Finally,based on the actual power grid,simulations verify the effectiveness of the proposed control architecture and control method,which can effectively improve the DC transmission capacity and the grid-connected power of renewable energy.