低壓配電網(wǎng)不平衡調(diào)補裝置控制系統(tǒng)研究
[Abstract]:A large number of single-phase loads and three-phase asymmetrical loads are connected in low-voltage distribution network. Especially in the three-phase four-wire system, the unbalanced problem of three-phase low-voltage distribution network is becoming increasingly prominent, which has brought serious impact on the safe operation of the low-voltage power network. The management of unbalanced operation of power grid is very important. One of the effective measures to solve this problem is to adopt unbalanced compensator composed of three-phase four-leg power electronic converter. The main contents are as follows: (1) the topology of three-phase four-wire converter is analyzed. The main topology of unbalanced regulator is three-phase four-leg converter and single inductance grid-connected interface. By detecting the non-positive sequence component in the load current of low-voltage distribution network, and injecting the opposite component into the power network by the device, the unbalanced current can be eliminated. (2) the FBD method based on generalized second-order integral is used to detect the non-positive sequence component of the current. In order to improve the detection accuracy and dynamic response speed, a notch filter and a wide band low-pass filter are used. (3) based on the mathematical model of the three-phase four-leg tuning device in 偽 尾 緯 coordinate system, A voltage-current double closed-loop control system based on PI controller and quasi-PR controller is designed. Through theoretical analysis, the designed control system has good steady-state performance and dynamic performance. The three-dimensional space vector modulation algorithm in abc coordinate system is used to effectively improve the DC side voltage utilization ratio and the output current waveform of the converter. The simulation model of unbalanced regulator is built in simulink environment, and the control performance of the system is analyzed and verified under the condition of symmetrical and asymmetric grid voltage respectively. The simulation results show that the improved current detection algorithm has good dynamic performance, the three-phase load imbalance control effect is good, and the designed three-phase load imbalance control scheme is reasonable. According to the design principle, the hardware system of three-phase unbalanced load adjusting and compensating device is built.
【學(xué)位授予單位】:西安科技大學(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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