Mainly completed by: China Electric Power Research Institute of Electric Power Automation Institute Mainly accomplished: Pu Tianjiao Yu Ting Wang Wei Bi Tian Shu Dong Lei Han Wei Yang Zhan Yong Wang Heng Li Shiguang Prince Introduction to the results Wind power is the largest and fastest-growing non-hydropower renewable energy in the world today and an important driving force behind a new round of energy reform based on clean energy. China plans eight wind power bases with a capacity of 10 million kilowatts, and the grid-connected power generation in each base has exceeded 65 million kilowatts, forming a unique wind power grid-connected mode of "large-scale development and centralized access" in China. Due to the strong volatility and uncertainty of wind power, large-scale wind power centralized access poses a serious challenge to the operation and control of the power grid. The reactive power and voltage problems in wind power convergence area have become increasingly prominent, which has become an important bottleneck restricting the reliable wind power consumption. The project of "R & D and Application of Reactive Power and Voltage Coordination Control System for Grid-connected Large-scale Wind Power" belongs to the field of power system automation and has been supported by a series of projects of State Grid Corporation of China for a period of 4 years with an investment of more than 20 million yuan. Of reactive power optimization control carried out in-depth theoretical research to achieve a breakthrough in key technologies and engineering applications, and has made a series of scientific and technological achievements: proposed based on wind power and load change trend identification and reactive power coordination of reactive power voltage The active control strategy is suitable for on-line accurate assessment of the voltage stability index in the area with weak voltage stability. Based on the non-linear complementary slack dual dual interior point method, the joint optimization model of reactive power optimization and voltage stabilization, the coordinated correction of voltage level and voltage stability Model and other original technologies, both at home and abroad are the first. Based on the above research results, a reactive power and voltage coordination control system that accounts for voltage stability constraints and supports grid-connected operation of large-scale wind power has been developed, which effectively solves the problem of reactive power and voltage control for centralized wind power access and supports reliable large-scale wind power Sent out to improve the voltage quality of the power grid and promote the development of grid reactive power voltage control technology. The project passed the authoritative test of the third party through the power quality testing center of the power system automation equipment. The project passed the appraisal of the achievement organized by the China Electric Power Construction Enterprises Association and concluded that the overall achievements are at the advanced international level. Based on the trend of wind power, Multi-reactive power source voltage coordination and optimization of control applications reached the international advanced level. Key technologies and innovation The first innovation point: for the first time proposed based on the wind power and load trends to identify active reactive voltage control strategy to improve the grid voltage quality and stability margin. Innovation point 2: The first online evaluation index of voltage stability based on branch voltage phasors is presented. Based on the state estimation results or PMU measurement data, the voltage stability weak links in the wind collection area and the load center area can be accurately identified online. Innovative point three: For the first time, the proposed relaxation primitive dual-interior point algorithm based on non-linear complementarity is proposed. It is suitable for large-scale nonlinear reactive power voltage control model that can quickly coexist continuous variables and discrete variables, effectively ensuring the convergence of online optimization calculation and Solving global optimality. Innovative point four: For the first time, based on wind power forecasting results and load forecasting results, a joint optimization model of voltage stability and reactive power optimization is established. Combined with the trend of transmission power and grid load of wind power gathering stations, the whole network with large-scale wind power Reactive voltage real-time coordination and optimization. Innovative point five: for the first time based on the voltage and reactive sensitivity of the relationship between the voltage stability margin and voltage level of the coordinated correction model to achieve the state of the grid failure in the joint can not be optimal control, the minimum reactive power Adjustment of the voltage stability margin of weak links or over-limit node voltage real-time correction. Application prospects The reactive power voltage control system developed based on the project achievements has been put into practical application in a number of dispatching control centers. While reducing the work intensity of personnel, it ensures the reliable sending of power at the wind power base and enhances the consumption of large-scale wind power grid-connected, Reduce the power loss, improve the voltage pass rate, inhibit the voltage fluctuations, improve the system voltage stability margin of the weak area. The practical application of project achievements has also promoted the development of grid reactive power voltage control technology and played an active role in reducing the risk of large-scale fan-out of wind turbines and played a supplementary role in reducing coal consumption. While ensuring the safety and stability of power grids, , Quality and economic operation at the same time, to achieve resource conservation and environmental protection, greatly promoted the harmonious development of economy and society. The project has been applied to a number of provincial and regional grid dispatching control centers in Heilongjiang, Liaoning, Xinjiang, Gansu, Qinghai, Fujian, Fuzhou and Baotou to achieve a new contractual amount of RMB7.14 million. After the project is applied, About 92 million yuan, increasing the wind power sent about 51 million yuan revenue, has made significant economic and social benefits. The project's achievements can be extended to grids connected to other 10-million-kilowatt wind power bases in the country and even to all the grids with large-scale wind power access and operation characteristics in the world. The application prospect is very broad. The project has applied for 9 invention patents (1 authorized), 17 published papers, 3 applied for software copyrights, 1 monograph for publication and 1 enterprise standard for State Grid Corporation of China.