Control of a Stand-Alone Inverter-Based Distributed Generation Source for Voltage Regulation and Harmonic Compensation

Abstract

Abstract-Operation of a distributed-generation (DG) source, producing sinusoidal output voltage and supplying nonlinear loads is characterized by a nonsinusoidal voltage at the point of common coupling (PCC). The situation gets particularly aggravated during the islanding mode, when the grid power is not available. This deteriorates the performance of other loads connected in parallel. A scheme based on nonsinusoidal pulsewidth-modulated control of a stand-alone inverter-based DG source is proposed to regulate and produce a sinusoidal voltage at the PCC. It is demonstrated that without any current sensor or compensating device, the individual harmonic components and THD of the supply voltage at the PCC can be reduced to the desired level. Simulations have been performed to study the viability of the proposed scheme and all of the results are presented.

Optimal Placement and Sizing of Capacitor and Power-Electronic Interfaced Distributed Generation in Heavy Harmonic Polluted Systems

“…So me good control systems are designed and introduced in papers. In this paper, the control system of [13] is used. Fig 3 shows this control system.…”

“…Fig 3 shows this control system. The detail of this system is fully described in [13]. Harmonic calculator and harmonic generator are t wo main parts of this control system.…”

Advanced Repetitive Controller to Improve the Voltage Characteristics of Distributed Generation with Nonlinear Loads

“…To fulfill that goal, several advanced control strategies have been developed [8], [9]. In [8], the authors attempted to improve the PCC voltage performance by using a bank of PI controller where each of the PI controllers is used to regulate the magnitude of a single harmonic voltage. In this control method, many PI controllers and coordinate transformations are required to compensate all of the harmonic voltages, which make the control strategy too complex.…”

An Enhanced Harmonic Voltage Compensator for General Loads in Stand-alone Distributed Generation Systems

“…However, the PI controller is unable to maintain a sinusoidal DG output voltage when unbalanced and/or nonlinear loads are connected to the PCC due to its limitation of the control bandwidth. In order to overcome this issue, several advanced control methods have been proposed such as PI controllers in [8], [9], predictive control [10], [11], adaptive control [12], multiple resonant controllers [13], [14], and repetitive control [15].…”

“…In [8], [9], to supply a pure sinusoidal output voltage at the PCC under a nonlinear load, a bank of PI controllers was used where each PI controller regulated the magnitude of a single harmonic voltage. In these control methods, many PI controllers and coordinate transformations are required to compensate all of the voltage harmonics, which makes this type of control strategy too complex.…”