Anti-islanding Detection Method for Grid-Connected Inverter Based on Current Vector Control

Abstract

Due to the Global Warming and environment pollution issue, the world increases rapidly Distributed Generations(DG) [1]-[4]. Power is supplied to the load through the DG, which reduces the power supply from the main grid. If the DGs supply rating power of the load, the operation of circuit breakers can’t be detected even though the circuit breakers between the grid and the load operate. ‘Islanding’ is a situation that the load is disconnected from the grid, and detecting the disconnection is called ‘anti-islanding detection’ [5]-[8], [12]. Various methods are suggested. Most of them deal with a single-phase or steady state. As the research has been conducted in single-phase loads and steady state, the conventional methods are difficult to adopt three-phase loads and have too slow responsiveness. In this paper, a new method is proposed to detect anti-islanding using current vector control and deals with three-phase and transient state. The proposed method detects islanding faster than some papers that deal with three-phase load and more effectively than others that inject reactive power. It is proceeded by analysis of load and simulation. It is verified in an experiment with an inverter, DSP, RLC load.