Method used for balancing three phases of direct current side voltages of chain power regulating device
A DC side voltage and power adjustment technology, applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc. Limits and other issues, to achieve the effect of being beneficial to engineering practice, less control parameters, and less calculation.
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[0026] The invention proposes a method for balancing the three-phase DC side voltage of a chain-type power regulating device. The detailed process of solving the negative sequence voltage is as follows: figure 1 shown, including the following steps:
[0027] (1) Obtain the DC side voltage of each H-bridge unit of the chain-type power regulator through the voltage sensor, denoted as: V du1 ..V dwn , V dv1 ..V dvn , V dw1 ..V dwn , where n represents the cascade number of each phase;
[0028] (2) According to the above DC side voltage, use the filter formula to filter out the 2ω ripple in the DC side voltage, and obtain the DC side voltage after filtering the ripple Among them, ω is the electrical angle of the power supply voltage;
[0029] (3) Using the formula Find the three-phase DC side voltage
[0030] (4) According to the DC side voltage of the above three phases use the formula Get the average value V of the three-phase DC side voltage d ;
[0031] (5)...
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