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提出一种新颖的三相并联型负荷特性模拟装置及其相应的主电路拓扑结构。该装置采用分相控制,其基波和谐波电流采用解耦控制,级联H桥模块采用三角载波移相控制,通过连接电抗器实现基波和谐波电流的注入及装置功率的调节。提出调节逆变器输出基波电压相角和幅值来调节注入系统的有功和无功功率,并给出装置有功和无功功率的数学表达式。分析装置在不同工况下的等效电路,得到系统电抗、基波连接电抗和谐波滤波电抗对装置注入电流精度的影响。对低频电流波动、电流谐波和功率因数调节分别进行仿真研究,仿真结果表明了主电路拓扑及控制策略对负荷特性模拟的可行性和有效性。
Proposed a novel three-phase parallel load characteristics simulation device and its corresponding main circuit topology. The device uses phase-separated control, the fundamental and harmonic current decoupling control, cascaded H-bridge module triangular carrier phase-shifting control, through the connection reactor to achieve fundamental and harmonic current injection and device power regulation. It is proposed to adjust the phase angle and amplitude of the fundamental voltage of the inverter output to adjust the active and reactive power injected into the system and give the mathematical expression of the active and reactive power of the device. By analyzing the equivalent circuit of the device under different operating conditions, the influence of the system reactance, fundamental connection reactance and harmonic filter reactance on the injection current accuracy of the device is obtained. Simulation of low frequency current ripple, current harmonic and power factor regulation are carried out respectively. The simulation results show the feasibility and effectiveness of the main circuit topology and control strategy for load characteristics simulation.