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UPQC with DQ0 and PQ control |DQ0 control | PQ control

UPQC with DQ0 and PQ control |DQ0 control | PQ control

Welcome, viewers, to another insightful session with LMS Solution! Today, we explore the intricacies of controlling the Unified Power Quality Conditioner (UPQC) using two distinct methods: DQ0 control for the series active filter and PQ control for the syntactic filter. We aim to compare the efficacy of both control strategies in terms of Total Harmonic Distortion (THD) and the mitigation of sags and swells.


Simulation Model Overview:

Our simulation model simulates an UPQC system with a grid source voltage of 400V and 50Hz. We introduce disturbances like voltage sags, harmonics, and swells, mimicking real-world scenarios. A series active power filter and a syntactic power filter are employed to address harmonic issues caused by a non-linear load.

Control Logic:

  1. DQ0 Control for Series Active Filter:

  • Measure source and load voltage.

  • Convert to DQ0 using PLL.

  • Generate a reference current using a PI controller.

  • Process DQ0 to abc using inverse transformations.

  • Generate pulses for the voltage source inverter to mitigate harmonic distortions.

  1. PQ Control for Syntactic Filter:

  • Measure load current and apply a low-pass filter.

  • Calculate real and reactive power, and zero sequence power.

  • Generate a reference current using a PQ controller.

  • Transform to abc and process for the voltage source inverter to mitigate harmonic distortions.

Simulation Results:

  1. Harmonic Injection:

  • DQ0 Control: THD reduced to 1.98%.

  • PQ Control: THD reduced to 0.14%.

  1. Voltage Sag:

  • DQ0 Control: THD during sag reduced to 0.93%.

  • PQ Control: THD during sag reduced to 0.94%.

  1. Voltage Swell:

  • DQ0 Control: THD during swell reduced to 2.83%.

  • PQ Control: THD during swell reduced to 2.83%.

Conclusion:

The comparative analysis reveals that both DQ0 control and PQ control are effective in mitigating harmonics during various operating conditions. However, PQ control demonstrates slightly superior performance in terms of THD reduction. Both methods successfully bring the THD levels under the acceptable IEEE/IEC standards of 5%, showcasing their potential for harmonic mitigation in UPQC systems.

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