本文關(guān)鍵詞：大規(guī)模風(fēng)電并網(wǎng)中級(jí)聯(lián)STATCOM的控制方法研究　出處：《湖南工業(yè)大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 風(fēng)電場(chǎng) 級(jí)聯(lián)STATCOM 單極倍頻SPWM 有功功率均等分配 正序-負(fù)序解耦PWM

【摘要】：隨著大規(guī)模的風(fēng)電場(chǎng)投入使用，其并網(wǎng)對(duì)電能質(zhì)量產(chǎn)生的負(fù)面影響日趨嚴(yán)重。通過(guò)在風(fēng)電場(chǎng)的出口配備無(wú)功補(bǔ)償裝置可以動(dòng)態(tài)補(bǔ)償系統(tǒng)中的無(wú)功功率，穩(wěn)定并網(wǎng)接入點(diǎn)電壓，，提高風(fēng)電機(jī)組低電壓和故障穿越能力，減少大規(guī)模風(fēng)電并網(wǎng)對(duì)大電網(wǎng)的沖擊。故本文針對(duì)風(fēng)電場(chǎng)中級(jí)聯(lián)STATCOM裝置的控制方法進(jìn)行深入研究。 首先，系統(tǒng)介紹了高壓大容量STATCOM常用主電路拓?fù)浣Y(jié)構(gòu)，比較它們的優(yōu)缺點(diǎn)后，得出級(jí)聯(lián)型拓?fù)涞膬?yōu)勢(shì)所在。利用矢量圖分析級(jí)聯(lián)STATCOM的工作原理，對(duì)系統(tǒng)主電路參數(shù)進(jìn)行了相關(guān)設(shè)計(jì)，詳細(xì)分析了單極倍頻SPWM調(diào)制策略性質(zhì)并闡述其優(yōu)點(diǎn)。 其次，針對(duì)級(jí)聯(lián)STATCOM的直流側(cè)電壓難以平衡問(wèn)題，提出基于有功功率均等分配的直流側(cè)電容電壓平衡控制方法。通過(guò)調(diào)節(jié)其交流側(cè)吸收的有功功率來(lái)控制直流側(cè)電壓的大小，采用分層協(xié)調(diào)控制策略實(shí)現(xiàn)級(jí)聯(lián)STATCOM的整體有功、無(wú)功控制，上層采用解耦實(shí)現(xiàn)總體有功、無(wú)功控制，下層通過(guò)模塊控制器實(shí)現(xiàn)有功功率均等分配控制。仿真和實(shí)驗(yàn)結(jié)果表明，該方法有效解決了級(jí)聯(lián)STATCOM直流側(cè)電容電壓難以平衡的關(guān)鍵問(wèn)題。 再次，針對(duì)不平衡工況下級(jí)聯(lián)STATCOM的控制問(wèn)題，提出基于正序-負(fù)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(jí)聯(lián)STATCOM輸出等效負(fù)序電壓的辦法來(lái)保證接入點(diǎn)的電壓平衡。推導(dǎo)了系統(tǒng)在正序和負(fù)序環(huán)境下的解耦控制方程，分析其延伸出來(lái)的無(wú)功補(bǔ)償和電壓控制兩種工作模式。根據(jù)不平衡度的三個(gè)范圍，提出分時(shí)段補(bǔ)償控制系統(tǒng)，實(shí)現(xiàn)了裝置的最大化利用。仿真和實(shí)驗(yàn)結(jié)果表明，該方法有效確保了級(jí)聯(lián)STATCOM在不平衡工況下的安全穩(wěn)定運(yùn)行。 最后，對(duì)級(jí)聯(lián)STATCOM控制系統(tǒng)進(jìn)行了軟硬件設(shè)計(jì)�？刂朴布脚_(tái)為雙DSP+FPGA+CPLD組合系統(tǒng)，分別對(duì)主控制板以及功率單元控制系統(tǒng)進(jìn)行了硬件設(shè)計(jì)。利用流程圖的方式對(duì)控制軟件進(jìn)行了設(shè)計(jì)，主要包括DSP1及DSP2的主程序和控制中斷程序、PWM信號(hào)生成及監(jiān)測(cè)軟件設(shè)計(jì)。
[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(xué)位授予單位】：湖南工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM614

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