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This paper presents work related to management of active and reactive power exchange between a distributed generation (DG) source and the grid to which it is connected; for improved utilization of electricity generated by the DG source such as solar energy. This is based on the recently introduced Availability Based Tariff (ABT) concept for the consumer loads, where conventional power grid is available...
Renewable energy sources are still increasing their penetration in the electric energy system. Their connection to the grid is being done at continuously reduced power. So, a robust current controller is one of the main requirements in a grid-connected voltage source converter, namely in distributed energy sources where the connection can be made to weak grids. Additionally, achieving unity power...
The Dynamic Voltage Restorer (DVR) is a custom power device that is mainly used for mitigation of voltage sags. The aim of this paper is to investigate and compare different control techniques for this device. In particular, the main focus of the paper is on optimal use of the energy storage. First, the adopted control structure for the DVR will be presented. Then, different strategies for voltage...
This paper deals with the application of enhanced phase locked loop (EPLL) technique for the voltage and frequency controller (VFC) in a stand-alone wind energy conversion system (WECS) using an isolated asynchronous generator (IAG) feeding three-phase four-wire loads. The fundamental component of three-phase load currents is extracted using EPLL. The EPLL is also used for estimation of the frequency...
The STATCOM (synchronous static compensator) based on voltage source converter (VSC) has gained wide attentions due to its outstanding performance and is used for voltage regulation in transmission and distribution systems. It can supply dynamic VAR's all over system faults for voltage support. The STATCOM operation can be adversely affected to voltage source converter (VSC) over-currents and trips,...
This paper investigates how different approaches to grid synchronization and reference frame orientation can improve the control performance of a voltage source inverter operating in a weak grid. It is first shown how voltage-sensor-less operation based on Virtual Flux allows for flexibility in how to choose the reference frame orientation of the control system. The different possible orientations...
The STATCOM (Synchronous Static Compensator) based on VSC (Voltage Source Converter) is used for voltage regulation in transmission and distribution systems. The STATCOM can rapidly generate or absorb dynamic reactive power during system faults for voltage regulation. Strict requirements of STATCOM loss and total system loss penalty preclude the use of PWM (Pulse-Width Modulation) for STATCOM applications...
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