Research On Reserve Dispatch Of Rigional Power Grid With Significant Wind Power Generation Penetration

In recent years, along with the fast development of global economy, the increaseduse of non-renewable resources (coal, petroleum, and natural gas, etc) has causedserious environmental problems such as air pollution and global warming. Under suchcircumstances, it is an inevitable trend to exploit renewable and clean energyextensively. Among all kinds of the renewable and clean energy, wind power generationdevelops most rapidly. Along with the widely use of wind power grid integration, andthe randomness, intermittence and anti-peak shaving of wind power generation, thecontroversy between power supply and demand has been intensified, and it is extremelydifficult to use traditional reserve dispatch method to realize active power balance ofelectric power system and real-time control. Therefore, the wind farm cannot generateelectricity for a long time and be low efficient in use of wind energy; the grid cannotfully integrate the wind power. All these problems are closed related to the influence ofwind power generation with high penetration on reserve demand of the grid.Aiming at the randomness and intermittence of the power of wind powergeneration, this paper introduces the net load of the system, quantize the―anti-peakshaving feature‖of wind power generation in use of coefficients, conduct accurate netload expectation based on GRNN (General Regression Neural Network), and determinethe whole reserve demand of the system according to the distribution of net loadexpectation and3principle in probability theoryOn the basis of net load expectation, three-time reserve dispatch mechanism isbuilt to make adjustment collectively. By refining time, the intermittence andrandomness of wind power grid integration is progressively reduced. The first dispatchfollows the principle of―justice, openness, fairness‖, the second utilizes―the swingingwindow algorithm‖to share the pressure of AGC generating sets, and the third appliesthe insensitivity of objective function around the local optimization point, to effectivelysolve the null of the optimized objective function of energy-saving andemission-reduction, and thus to economize the grid operation.According to the third paradigm design theory of database, a database of gridoperation parameters is designed, Matlab GUI and SQL Server are jointed, and amulti-layered on-line reserve dispatch and decision system is built, the foregroundinginterface of which cooperates smoothly with the back-end database. The system hasmany functions, such as data browser, analysis of anti-peak shaving of wind powergeneration, frequency, ACE intermittence analysis, net load expectation, optimizingallocation of the first, second, and third reserve dispatch, evaluation of frequencycontrol function, and decision analysis.At last, the system is tested by the real operation data of the grid in one province, and the test result proves its practicability and feasibility.This paper is sponsored by NSFC Project Research on Coordination andOptimization of Reserve Dispatch for Random Intermittent Perturbation (Project ID：51077027) and National High-tech R&D Program of China (863Program) HighPenetration of Intermittent Energy Research and Demonstration of the KeyTechnologies of the Regional Power Grid (Project ID：2011AA05A105).