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Small Signal Stability Analysis Of Electric Power System In Respect Of Large Wind Farm Connection

Posted on:2016-11-07Degree:MasterType:Thesis
Country:ChinaCandidate:J C ZhangFull Text:PDF
GTID:2272330470475671Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
Wind power is the fastest-emerging renewable alternatives for the electrical supply around the world and makes up a growing percentage of power system of China. As installed capacity of wind power increases, large-scale wind power will have a growing impact on the stability of power system. Among them, the small signal stability problem attracts many concerns. China’s wind power development strategy is to build large million kilowatt wind power bases and large-scale wind power transmission. This may have a more serious impact on the system small signal stability. The primary contents can be summarized as follows:Firstly, the mathematical models of double-fed induction generator and direct-driven permanent magnet synchronous generator are established. The models include the electrical system models, the mechanical system models and the network interface model. The appropriate state variables, output variables and input variables are selected and the dynamic model is linearized around an initial operating point. The linear model for the small signal stability analysis is obtained.Secondly, The small signal stability of electric power system with large wind power connection has been studied in detail. Two-area four-machine power system model is established by using DIg SILENT/Power Factory software. The DFIG-based wind farm and PMSG-based wind farm are respectively connected to the system model. Based on the different operation conditions of wind farm the analysis is divided into five parts to discuss.Thirdly, the principle of dynamic active power injection and dynamic reactive power injection to improve the system damping was analyzed. A supplementary damping controller of DFIG and PMSG was investigated according to this principle. The voltage phase angles difference was selected as the input signal, the supplementary damping controller was added to the active power control loop and reactive power control loop separately.Fourthly, the proposed controller’s performance was testified through eigenvalue analysis and time domain simulation.
Keywords/Search Tags:power system, wind power generation, DFIG, DDPMSG, small signal stability, damping control
PDF Full Text Request
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