本文關鍵詞：大規(guī)模風電并網中級聯STATCOM的控制方法研究　出處：《湖南工業(yè)大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 風電場 級聯STATCOM 單極倍頻SPWM 有功功率均等分配 正序-負序解耦PWM

【摘要】：隨著大規(guī)模的風電場投入使用，其并網對電能質量產生的負面影響日趨嚴重。通過在風電場的出口配備無功補償裝置可以動態(tài)補償系統中的無功功率，穩(wěn)定并網接入點電壓，，提高風電機組低電壓和故障穿越能力，減少大規(guī)模風電并網對大電網的沖擊。故本文針對風電場中級聯STATCOM裝置的控制方法進行深入研究。 首先，系統介紹了高壓大容量STATCOM常用主電路拓撲結構，比較它們的優(yōu)缺點后，得出級聯型拓撲的優(yōu)勢所在。利用矢量圖分析級聯STATCOM的工作原理，對系統主電路參數進行了相關設計，詳細分析了單極倍頻SPWM調制策略性質并闡述其優(yōu)點。 其次，針對級聯STATCOM的直流側電壓難以平衡問題，提出基于有功功率均等分配的直流側電容電壓平衡控制方法。通過調節(jié)其交流側吸收的有功功率來控制直流側電壓的大小，采用分層協調控制策略實現級聯STATCOM的整體有功、無功控制，上層采用解耦實現總體有功、無功控制，下層通過模塊控制器實現有功功率均等分配控制。仿真和實驗結果表明，該方法有效解決了級聯STATCOM直流側電容電壓難以平衡的關鍵問題。 再次，針對不平衡工況下級聯STATCOM的控制問題，提出基于正序-負序解耦PWM的控制方法。分析了其在不平衡工況下的工作特性，采用讓級聯STATCOM輸出等效負序電壓的辦法來保證接入點的電壓平衡。推導了系統在正序和負序環(huán)境下的解耦控制方程，分析其延伸出來的無功補償和電壓控制兩種工作模式。根據不平衡度的三個范圍，提出分時段補償控制系統，實現了裝置的最大化利用。仿真和實驗結果表明，該方法有效確保了級聯STATCOM在不平衡工況下的安全穩(wěn)定運行。 最后，對級聯STATCOM控制系統進行了軟硬件設計�？刂朴布脚_為雙DSP+FPGA+CPLD組合系統，分別對主控制板以及功率單元控制系統進行了硬件設計。利用流程圖的方式對控制軟件進行了設計，主要包括DSP1及DSP2的主程序和控制中斷程序、PWM信號生成及監(jiān)測軟件設計。
[Abstract]:With the large-scale wind farm put into use, the negative impact of grid connection on power quality is becoming more and more serious. Reactive power can be dynamically compensated by installing reactive power compensator at the outlet of wind farm. Stable access point voltage, improve wind turbine low voltage and fault traversing ability. To reduce the impact of large-scale wind power grid connection on large power grid, this paper makes a deep research on the control method of wind farm intermediate STATCOM device. Firstly, the main circuit topology of high voltage and large capacity STATCOM is introduced, and their advantages and disadvantages are compared. The advantages of cascade topology are obtained. The main circuit parameters of the system are designed by using vector diagram to analyze the working principle of cascade STATCOM. The properties and advantages of monopole frequency doubling SPWM modulation strategy are analyzed in detail. Secondly, it is difficult to balance the DC voltage of cascaded STATCOM. A DC side capacitor voltage balance control method based on equal distribution of active power is proposed. The magnitude of DC side voltage is controlled by adjusting the active power absorbed by the AC side. The overall active and reactive power control of cascaded STATCOM is realized by hierarchical coordinated control strategy, and the total active and reactive power control is realized by decoupling in upper layer. The simulation and experimental results show that this method can effectively solve the key problem that the capacitor voltage of cascaded STATCOM DC side is difficult to balance. Thirdly, aiming at the control problem of cascaded STATCOM under unbalanced conditions, a control method based on positive and negative sequence decoupling PWM is proposed, and its working characteristics under unbalanced conditions are analyzed. The voltage balance of the access point is ensured by using cascade STATCOM to output equivalent negative sequence voltage. The decoupling control equations of the system in positive sequence and negative sequence environment are derived. The extended reactive power compensation and voltage control modes are analyzed. According to the three ranges of unbalance, the compensation control system is put forward, which realizes the maximum use of the device. The simulation and experimental results show that. This method effectively ensures the safe and stable operation of cascaded STATCOM under unbalanced conditions. Finally, the software and hardware of the cascade STATCOM control system are designed. The control hardware platform is a dual DSP FPGA CPLD integrated system. The main control board and power unit control system are designed respectively. The control software is designed by flow chart, including the main program of DSP1 and DSP2 and the control interrupt program. PWM signal generation and monitoring software design.
【學位授予單位】：湖南工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM614

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本文編號：1431658