Secondly, in the aspect of nonlinear robust control theory and power system application, we have solved two major problems in the international engineering control field: the construction of nonlinear robust controller and the optimal control of non-minimum phase system, and participated in the development of nonlinear robust excitation control device for large generator set, nonlinear robust control device for large hydro-generator set speed regulation system and nonlinear robust control device for superconducting energy storage equipment;
Thirdly, in the theory and application of hybrid control of power system, a sequential algorithm for multi-objective optimization of voltage hybrid control system is proposed, which can realize the hierarchical control of voltage/frequency of the whole system and realize the comprehensive control goal of safe, high-quality and economic operation of power grid. More than 200 papers have been published at home and abroad, including more than 50 SCI papers and more than 50 EI papers 150. 3 patents;
He has published nine books, including two English books published by KLUWER Publishing House in America and Springer Publishing House in Germany.
He has participated in natural science foundation, 863 national sub-projects and 973 national sub-projects and 28 other engineering application projects. Among them, 17 projects have passed the appraisal of relevant departments and obtained high evaluation;
He used to be the chief scientist assistant of the national basic research project (973) "Research on Major Scientific Problems of Large-scale Power System Catastrophe Prevention and Economic Operation in China", and was in charge of the 973 project "Nonlinear Robust Control of Large-scale Power System", the outstanding youth fund project "Transient Analysis of Power System" and the general natural science fund project "Hybrid Voltage Control", the key natural science fund project "Abnormal Dynamic Behavior and Characteristics of Very Large-scale Power System" and the 863 sub-project.
As the backbone, he participated in the national key natural science foundation project, the Ninth Five-Year Plan and the high-tech demonstration project of the National Development and Reform Commission. (1) Assisted Professor Lu Qiang to systematically put forward the basic theoretical framework for disaster prevention and control of large power system, including stability theory, control theory and real-time simulation decision-making command system of large power system. The innovation of this theoretical framework was first confirmed by becoming the first batch of key basic research projects in 1998. Later, with the continuous progress of project research, the theory and technology of power system disaster prevention are more important for China power system to prevent catastrophic accidents like the 8. 14 blackout in the United States and Canada.
(2) The establishment and engineering realization of a new nonlinear robust control theory for power system. For more than ten years, the international engineering control field has been plagued by two difficult problems: first, the construction of nonlinear robust controller must solve HJI inequality (quadratic partial differential inequality), which has no general solution in mathematics; The second is the optimal control problem of non-minimum phase system (such as hydraulic turbine speed regulation system). Firstly, the new theory puts forward the feedback H∞ method and the direct solution of dissipative integral equation, thus avoiding the difficulty of solving HJI inequality. Secondly, a feedback design method of SDM based on state, dynamic and measurement feedback is proposed, and a nonlinear optimal controller is constructed for a class of non-minimum phase systems. Under the guidance of theoretical results, the nonlinear robust excitation controller for large generator sets and the nonlinear controller for turbine speed regulation of Three Gorges Power Station are developed, which can significantly improve the stability of the system and increase the power transmission limit by more than 15%. Among them, the nonlinear robust excitation controller has been successfully put into operation in 300MW unit of Baishan Power Plant of Northeast Power Grid, and won the first prize of scientific and technological progress of State Grid Corporation in 2008. As a part of "nonlinear control of large power system", the above theoretical achievements won the second prize of National Natural Science in 2008.
(3) The theory and application of hybrid automatic voltage control. The concept, model, theoretical framework and methodology of hybrid automatic voltage control system are established for the first time, and a set of theoretical system of hybrid electric power control system is established, which can realize hierarchical voltage regulation of the whole system, thus achieving comprehensive control objectives such as voltage level, voltage dynamic quality, voltage stability and operation economy. The results are applied to the automatic closed-loop control of reactive power/voltage in Northeast China, AEMS 500kv power grid, Shanghai power grid hybrid control system and Shenzhen power grid disaster prevention system, which can effectively improve the voltage control level, enhance the anti-interference ability of power grid, improve voltage stability, rationally distribute reactive power and reduce network loss. This technology is closely combined with the existing technical conditions and actual situation of power grid, such as software and hardware, and has obvious originality and high feasibility.
(4) In the aspect of power grid security, the self-organized criticality theory of power system is established systematically. The main innovations of this theory include: 1. A multi-time scale power grid evolution mechanism model is constructed, which can comprehensively analyze and reveal the power grid blackout mechanism from the perspectives of reactive power, voltage and transient stability. 2. The simulation analysis method of cascading failures and blackouts in power system is put forward, which can accurately evaluate the safe operation level and put forward corresponding prevention and control measures. The research results in this field have been published in IEEE/PWRS, the authoritative journal of international electrical engineering, and the evaluation experts think this work is "a significant progress in cascading failure analysis". This achievement has been applied to the national public security platform. Distributed continuous reactive power generator; The first finisher;
Distributed comprehensive power quality regulating device; The first finisher;
Nonlinear governor controller of 32-bit hydraulic turbine: the second finisher;
Excitation control method based on nonlinear robust power system stabilizer (Ⅱ);
Static mixed voltage automatic control intermediate layer generator set and reactive power compensator adjustment method; A second finisher;
Adjustment method of static hybrid automatic voltage control intermediate layer on-load voltage regulating transformer: second finisher;
Static hybrid automatic voltage control top-level safety regulation method; The fourth destination.