Dual-loop compound control method of unified power quality controller
A compound control and power quality technology, applied in AC network voltage adjustment, electrical components, circuit devices, etc., can solve problems such as low compensation accuracy, poor tracking ability of PI control, and inability to accurately track UPQC compensation commands, etc.
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[0048] A dual-loop compound control method for a unified power quality regulator includes the following steps:
[0049] ⑴ Such as figure 1 The shown three-phase three-wire UPQC topology diagram consists of a series three-phase converter circuit and a parallel three-phase converter circuit sharing a DC side capacitor; the series three-phase converter circuit is connected in series through a coupling transformer Between the load and the power grid, it plays the role of compensating for the distortion voltage in the power grid and adjusting the amplitude of the load voltage, supplying the load with a three-phase balanced sinusoidal voltage. The parallel three-phase converter circuit is connected in parallel to the nonlinear load, and is mainly used to compensate the harmonic current and reactive current caused by the nonlinear load being connected to the grid, and to maintain the stability of the DC side capacitor voltage to ensure that the grid input current is three-phase balanced ...
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