Double closed loop PI control with full compensation arc elimination based on zero sequence voltage of neutral point
Hongwen Liu, Xiangjun Zeng, Qing yang, Chenchao Chai
TL;DR
This paper proposes a dual-closed-loop PI control method to eliminate arcs during grounding faults by stabilizing the neutral point voltage and fault phase residual voltage.
Contribution
The novel dual-closed-loop PI control algorithm improves arc suppression by using neutral point and fault phase voltage feedback for controllable voltage sources.
Findings
The dual-closed-loop PI control stabilizes the controllable voltage source's output waveform during grounding faults.
The proposed method reduces fault phase residual voltage to below 10 V, ensuring reliable arc extinction.
Simulation and low-voltage tests confirm the algorithm's stability and feasibility across varying transition resistances.
Abstract
Aiming at the problem of zero sequence voltage generated by unbalance parameters of line to ground, which affects arc suppression effect of grounding fault of controllable voltage source. By analyzing the influence of ground unbalance parameters on the arc suppression effect of controllable voltage source under different grounding modes, the mechanism of full compensation arc suppression based on zero sequence voltage of neutral point is revealed, and on this basis, a fully compensated arc suppression model of controllable voltage source controlled by double closed loop PI is established, and the deviation control is carried out by using the neutral voltage of distribution network and the voltage of fault phase supply. The residual voltage ring adopts the ground fault phase residual voltage for closed loop control. The simulation results show that the dual-closed-loop PI control…
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Taxonomy
TopicsElectrical Fault Detection and Protection · Power Systems Fault Detection · Electric Power Systems and Control