【摘要】：DSTATCOM作為一種重要的用戶電力裝置，能綜合解決配電網(wǎng)中電壓波動與閃變、電流畸變、三相電壓不平衡等電能質(zhì)量問題，且隨著配電網(wǎng)負荷的增加，對DSTATCOM的容量提出了更高的要求，而H橋級聯(lián)型DSTATCOM以其易于模塊化設(shè)計、易于向高壓拓展等優(yōu)點，成為了國內(nèi)外電力領(lǐng)域的研究熱點。本文以H橋級聯(lián)型DSTATCOM的控制系統(tǒng)為研究對象，重點對PWM調(diào)制算法、補償電流控制以及直流側(cè)電容電壓平衡控制進行了系統(tǒng)和深入的研究。 本文對DSTATCOM的工作原理和主電路拓撲結(jié)構(gòu)進行了分析，在此基礎(chǔ)上，建立了ABC坐標系、坐標系以及dq同步旋轉(zhuǎn)坐標系下的數(shù)學(xué)模型。然后詳細介紹了載波移相脈寬調(diào)制技術(shù)，主要是雙極性CPS-PWM和單極倍頻CPS-PWM，并對H橋級聯(lián)型拓撲的結(jié)構(gòu)進行了研究，然后借鑒CPS-PWM和SVM技術(shù)的優(yōu)點，，得到了適合H橋級聯(lián)型DSTATCOM控制的相移空間矢量脈寬調(diào)制技術(shù)(PS-SVM)，仿真驗證了其正確性。 在對DSTATCOM數(shù)學(xué)模型進一步分析的基礎(chǔ)上，建立了系統(tǒng)模型，并引入線性PI控制器對無功電流和有功電流進行解耦，得到了功率前饋解耦控制模型。此外，采用虛擬磁鏈技術(shù)對電網(wǎng)電壓進行定向，實現(xiàn)了無網(wǎng)側(cè)電動勢傳感器的控制，且對虛擬磁鏈觀測的積分初值問題進行了研究。采用廣義積分迭代控制算法對一些特征諧波進行抑制。在對直流側(cè)電容電壓不平衡原因分析的基礎(chǔ)上，對直流側(cè)電容電壓采用三級平衡控制策略。仿真驗證了上述方法的正確性。 最后，對H橋級聯(lián)型DSTATCOM裝置的軟硬件結(jié)構(gòu)進行了介紹，并給出了主電路器件選型計算方法以及系統(tǒng)軟件流程圖。最后，搭建了實驗平臺對本文所提理論進行驗證，結(jié)果表明本文所提理論的正確性和有效性。
[Abstract]:As an important user power device, DSTATCOM can comprehensively solve the power quality problems such as voltage fluctuation and flicker, current distortion, three-phase voltage imbalance and so on. Higher requirements for the capacity of DSTATCOM have been put forward, and H-bridge cascaded DSTATCOM has become a research hotspot in the field of electric power at home and abroad because of its advantages of easy modularization design and easy to expand to high voltage. In this paper, the H-bridge cascaded DSTATCOM control system is taken as the research object. The PWM modulation algorithm, compensation current control and DC capacitive voltage balance control are studied systematically and deeply. In this paper, the working principle of DSTATCOM and the topology structure of main circuit are analyzed. On this basis, the mathematical models of ABC coordinate system, coordinate system and dq synchronous rotation coordinate system are established. Then, the carrier phase-shifted pulse width modulation technology is introduced in detail, including bipolar CPS-PWM and unipolar frequency doubling CPS-PWM, and the structure of H-bridge cascaded topology is studied. Then the advantages of CPS-PWM and SVM are used for reference. A phase-shifted space vector pulse width modulation (PS-SVM) technique suitable for H-bridge cascaded DSTATCOM control is obtained and its correctness is verified by simulation. Based on the further analysis of the DSTATCOM mathematical model, the system model is established, and the reactive current and active current are decoupled by the linear PI controller, and the power feedforward decoupling control model is obtained. In addition, the virtual flux technique is used to orient the grid voltage to realize the control of the gridless electromotive force sensor, and the integral initial value problem of the virtual flux observation is studied. The generalized integral iterative control algorithm is used to suppress some characteristic harmonics. Based on the analysis of the reasons for the unbalance of the capacitor voltage in the DC side, the three-stage balance control strategy is adopted for the capacitor voltage in the DC side. The correctness of the above method is verified by simulation. Finally, the hardware and software structure of H-bridge cascaded DSTATCOM device is introduced, and the calculation method of main circuit device selection and the system software flow chart are given. Finally, the experimental platform is built to verify the proposed theory, and the results show that the proposed theory is correct and effective.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM761.12

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本文編號：2209502