Feedforward Harmonic Mitigation Strategy for Single-Phase Voltage Source Converter

Abstract

With the development of distributed generations (DGs), single-phase voltage source converter (SPVSC) has been widely used, but it brings about the problem of harmonic pollution to power grid. Hence, it is significant to explore the mechanism of harmonic injection from SPVSC and propose effective control strategies to mitigate the harmonic pollution. In this paper, a harmonic analysis model of SPVSC based on dynamic phasor (DP) has been established. With the model, the harmonics interaction between the ac side and the dc side can be analyzed with the consideration of the control strategies, which reveals the generation mechanism of the harmonics in SPVSC. Based on the mechanism, a feedforward harmonic mitigation strategy has been presented. The principle of the strategy is to add low-order harmonic signal to the PWM modulation signals to reduce the harmonic current on the ac side. The harmonic mitigation strategy not only has clear physical meaning and fast calculation, but also is robust for the uncertainty of parameters. Finally, the simulation and experiment results demonstrate the correctness of the model and the effectiveness of the harmonic mitigation strategy.

Utilization of Arduino Control in Mitigating the Hybrid Harmonics of DC/AC Inverter

“…While tuning the circuit, a point is normally reached where further tuning does not produce any further improvement in THD. But with proper adjustments in the controller tuning process, however, it is possible to alter which harmonics are suppressed while maintaining the total harmonic distortion reasonably constant [3][4][5][6][7][8][9]. This is mainly because of the interaction between the dynamics of the controller and supply together with line inductance.…”

Shunt Active Power Filter Based on Proportional Integral and Multi Vector Resonant Controllers for Compensating Nonlinear Loads

“…In recent years, with the intensification of the global energy crisis, the renewable energy and power electric technology have been integrated, which has promoted the development of distributed generators (DGs) [1,2]. e speed driver of small motor, voltage source converter, and a large number of nonlinear loads including electric arc furnace, high-power rectifier, transducer, and fluorescent are connected to the grid, which will cause harmonic pollution unavoidably [3][4][5].…”

“…e speed driver of small motor, voltage source converter, and a large number of nonlinear loads including electric arc furnace, high-power rectifier, transducer, and fluorescent are connected to the grid, which will cause harmonic pollution unavoidably [3][4][5]. e power grid operates in this state for a long run, which will bring great harm to power system and power consumers, mainly manifested in the following respects: (1) e line loss of the system is increasing greatly, and the operating efficiency of the grid is reduced. A lot of 3rd harmonics will also increase the neutral current, leading to the damage of the custom power devices.…”