H桥级联型DSTATCOM研究

发布时间：2018-08-28 13:18

【摘要】：DSTATCOM作为一种重要的用户电力装置，能综合解决配电网中电压波动与闪变、电流畸变、三相电压不平衡等电能质量问题，且随着配电网负荷的增加，对DSTATCOM的容量提出了更高的要求，而H桥级联型DSTATCOM以其易于模块化设计、易于向高压拓展等优点，成为了国内外电力领域的研究热点。本文以H桥级联型DSTATCOM的控制系统为研究对象，重点对PWM调制算法、补偿电流控制以及直流侧电容电压平衡控制进行了系统和深入的研究。 本文对DSTATCOM的工作原理和主电路拓扑结构进行了分析，在此基础上，建立了ABC坐标系、坐标系以及dq同步旋转坐标系下的数学模型。然后详细介绍了载波移相脉宽调制技术，主要是双极性CPS-PWM和单极倍频CPS-PWM，并对H桥级联型拓扑的结构进行了研究，然后借鉴CPS-PWM和SVM技术的优点，，得到了适合H桥级联型DSTATCOM控制的相移空间矢量脉宽调制技术(PS-SVM)，仿真验证了其正确性。 在对DSTATCOM数学模型进一步分析的基础上，建立了系统模型，并引入线性PI控制器对无功电流和有功电流进行解耦，得到了功率前馈解耦控制模型。此外，采用虚拟磁链技术对电网电压进行定向，实现了无网侧电动势传感器的控制，且对虚拟磁链观测的积分初值问题进行了研究。采用广义积分迭代控制算法对一些特征谐波进行抑制。在对直流侧电容电压不平衡原因分析的基础上，对直流侧电容电压采用三级平衡控制策略。仿真验证了上述方法的正确性。 最后，对H桥级联型DSTATCOM装置的软硬件结构进行了介绍，并给出了主电路器件选型计算方法以及系统软件流程图。最后，搭建了实验平台对本文所提理论进行验证，结果表明本文所提理论的正确性和有效性。
[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.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761.12

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