【摘要】：隨著對供電可靠性以及供電質(zhì)量要求的不斷提高,動態(tài)無功補償作為穩(wěn)定電壓水平的一種主要方法,其中靜止同步補償器具有許多優(yōu)點成為目前國內(nèi)外研究的熱點并代表了無功補償裝置的發(fā)展趨勢。鏈?zhǔn)絊TATCOM就是將多個H橋模塊在直流輸出側(cè)串聯(lián)而成,提高了電壓等級,同時也增大了設(shè)備的容量。由于每個H橋之間的參數(shù)差異,使得直流側(cè)電容電壓出現(xiàn)不平衡現(xiàn)象,直接影響到裝置輸出電壓和電流波形質(zhì)量,嚴(yán)重時甚至?xí)䦟?dǎo)致整個裝置的崩潰。因此,鏈?zhǔn)絊TATCOM的直流側(cè)電容電壓平衡問題是STATCOM的研究重點和難點之一。本文分析了 STATCOM直流側(cè)電容電壓不平衡的原因以及常用的解決措施,裝置正常發(fā)出無功電流時,可根據(jù)輸出電流采取所需的電容電壓平衡控制方法維持直流側(cè)電容電壓平衡。當(dāng)裝置所發(fā)出的無功電流為零或者特別小時,即零輸出無功狀態(tài)下,鏈?zhǔn)絊TATCOM采用這些電壓平衡控制方法會使電壓平衡能力降低,甚至失去平衡控制能力。針對該問題,本文提出了給STATCOM輸出指令電流中注入三次諧波電流的方法維持直流側(cè)電容電壓平衡,分析了注入的三次諧波電流幅值與平衡可調(diào)最大功率關(guān)系,并對調(diào)控能力進(jìn)行了分析,給出三次諧波電流最小幅值的確定方法,基于有功矢量疊加的平衡控制方法,在MATLAB/Simulink中搭建鏈?zhǔn)絊TATCOM仿真模型,仿真結(jié)果證明了所提方法的可行性。本文設(shè)計了鏈?zhǔn)絊TATCOM實驗平臺的軟件程序。在該實驗平臺上對STATCOM零輸出無功時的直流側(cè)電容電壓平衡控制方法進(jìn)行了實驗驗證,并與傳統(tǒng)的STATCOM直流側(cè)電容電壓控制方法進(jìn)行實驗對比,實驗結(jié)果證明了鏈?zhǔn)絊TATCOM零輸出無功時注入三次諧波電流維持電壓平衡的有效性。
[Abstract]:With the improvement of power supply reliability and power supply quality, dynamic reactive power compensation is regarded as a main method to stabilize voltage level. Among them, static synchronous compensator has many advantages and has become a hot spot at home and abroad and represents the development trend of reactive power compensator. Chain STATCOM is a series of H-bridge modules at the DC output side, which improves the voltage level and increases the capacity of the equipment. Because of the difference of the parameters between each H bridge, the capacitance voltage on the DC side is unbalanced, which directly affects the quality of the output voltage and current waveform of the device, and even leads to the collapse of the whole device. Therefore, the DC-side capacitor voltage balance of chain STATCOM is one of the key and difficult problems in STATCOM research. In this paper, the causes of the voltage imbalance of the DC side capacitor of STATCOM and the common solutions are analyzed. When the device sends out the reactive current normally, the capacitor voltage balance of the DC side can be maintained according to the capacitive voltage balance control method required by the output current. When the reactive current emitted by the device is zero or special, that is, in the state of zero output reactive power, the chain STATCOM will reduce the voltage balance ability and even lose the balance control ability by using these voltage balance control methods. To solve this problem, a method of injecting third-harmonic current into the output instruction current of STATCOM is proposed to maintain the voltage balance of the DC side capacitance. The relationship between the amplitude of the injected third-harmonic current and the balance adjustable maximum power is analyzed. The method of determining the minimum amplitude of the third harmonic current is given. Based on the balance control method of active power vector superposition, the chain STATCOM simulation model is built in MATLAB/Simulink. The simulation results prove the feasibility of the proposed method. The software program of chain STATCOM experimental platform is designed in this paper. The DC side capacitive voltage balance control method of STATCOM with zero output reactive power is verified and compared with the traditional STATCOM DC side capacitor voltage control method. The experimental results demonstrate the effectiveness of voltage balance by injecting third-harmonic current into the chain STATCOM with zero output reactive power.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM761.12

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