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The DC link reactor has a capacity of 2 hp (1.5 kW) and a rated current of 8A, and is suitable for DC system voltage levels of 220V/380V/400V. Single-phase DC smoothing reactors offer high filtering performance and low energy consumption, commonly used in inverters, rectifiers, and power converters to improve DC power quality and protect equipment.
Q1: Where are DC reactors installed?
DC link reactors are typically installed on the DC bus (DC Link) between the rectifier and inverter. Inside a frequency converter (VFD), DC reactor is located between the rectifier bridge output and the DC capacitor; some designs also connect it in series in the DC bus circuit. Simply put, DC line reactor is the intermediate link between AC-to-DC and DC-to-AC conversion, used to regulate and optimize the DC-side current.
Q2: How do DC reactors improve power quality?
Dual DC link reactors, through their inductive characteristics, can suppress the rate of change of current (di/dt), effectively reducing ripple current in the DC bus. Simultaneously, they reduce harmonic propagation to the grid side, improving the input current waveform to be closer to a sine wave. Furthermore, DC link chokes limit inrush current and surge current, reducing the impact on the rectifier and capacitor, thus improving overall system stability and power quality.