摘要: |
针对动态电压恢复器(Dynamic Voltage Restorer, DVR)在分布式电网中补偿电压暂降出现的延时和控制不稳定等问题,本文提出一种无串联变压器型DVR的预测电压控制策略,该控制方法采用离散模型为一个电压源逆变器和一个用于开关控制逆变器结合生成一个接口滤波器。 在不需要任何线性控制器或调制技术下,通过DVR跟踪参考电压有效预测控制,保持负载电压在各种电压扰动下稳定输出正弦电压值。在DVR补偿控制策略方面,采用最小有功功率补偿控制策略,该方法更为有效地延长DVR补偿时间,降低DVR输出的有功功率,仿真分析与实验结果验证了所提方法的可行性。 |
关键词: 动态电压恢复器 分布式电网 预测电压控制 参考电压 最小有功功率补偿 |
DOI: |
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基金项目:江苏省科技计划项目 |
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Research on compensation control strategy based on DVR in distributed power system |
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Abstract: |
According to the dynamic voltage restorer (Dynamic Voltage Restorer, DVR) in compensation of voltage sag is delay and control the instability problems in distributed network, this paper proposes a transformerless DVR predictive voltage control strategy, the control method of the discrete model for a voltage source inverter and a control switch for inverter are combined to generate a interface filter. Without the need of any linear controller or modulation technology, the DVR is used to track the reference voltage for effective predictive control, and the load voltage is stable to output sinusoidal voltage under various voltage disturbances. In the aspect of DVR compensation control strategy, using the minimum active power compensation control strategy, this method is more effective to extend the DVR compensation time, reduce the active power output of DVR, simulation and experimental results verify the feasibility of the proposed method. |
Key words: Dynamic voltage restorer , Distributed network, Predictive voltage control, Reference voltage, Minimum active power compensation |