Control of Parallel Voltage Source Inverters in AC Variable-speed Drive Systems

Nonlinear Control of Voltage Source Inverters in Microgrids

Microgrids represent a new and flexible form of electrical networks. This form is based on the use of Distributed Generators which are connected to a microgrid through Voltage Source Inverters (VSI). In this paper, we propose a nonlinear controller that allows the regulation of the output voltage and frequency of a VSI. The system consists of a VSI and an LC filter associated to a coupling indu...

Current Regulator Instabilities on Parallel Voltage Source Inverters

Parallel inverters are often used to meet system power requirements beyond the capacity of the largest single structure. They have also been used to reduce harmonics, reduce PWM switching frequency and increase available output voltage or frequency. The type of parallel structure depends on the construction of the load motor, the most prevalent are dual three phase machines, split-phase machine...

Load Sharing Control of Parallel Inverters with Uncertainty in the Output Filter Impedances for Islanding Operation of AC Micro-Grid

Parallel connection of inverter modules is a solution to increase reliability, efficiency and redundancy of inverters in Micro-Grid system. Proper load sharing among parallel inverters is a key point. The circulating current among the inverters can greatly reduce the efficiency or even cause instability of the system. In this paper, a control strategy for improving the load sharing performance ...

Design and Simulation of Double Loop Control for Power Converter Fed Variable Speed DC Drive

Simplified control method for parallel-connected DC/AC inverters

The parallel operation of several low-capacity inverters is better than a singular highcapacity inverter owing to the advantages of better extensibility and reliability. A simplified control method for parallel-connected inverters is proposed, which can balance the current distribution among the parallel-connected inverters with no interconnected communication lines. To verify the performance o...