Remote control of distributed generation system

Shirin Lina, Farhana (2009) Remote control of distributed generation system. Masters thesis, Memorial University of Newfoundland.

[English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (3MB)

Abstract

The dynamic nature of distributed generation (e.g. from wind) makes to design a control system for wind turbines that utilize wind energy. The design of a wind turbine control system becomes more difficult when the system is operated in grid-connected mode. The major issues include connection standard, control system complexity, cost and required instrumentation. A low cost control system and its associated instrumentation development is very important for commercial success of a small grid connected inverter based wind turbine. The proposed grid connected inverter based remote control system is a good candidate for distributed generation system such as a small wind turbine. -- The main purpose of this research is to present a novel remote power control for a small single phase grid connected inverter using a DC-DC converter and an ADR101 serial data acquisition card. Before grid connection characteristics of the inverter are programmed for a desired input DC voltage for generating the output electrical power. Input dc voltage of the inverter is adjusted by controlling the DC-DC converter. A PC is employed to receive the required output power signal from a dispatch center via the Internet. The PC determines the power being fed by the inverter to the grid and uses an ADR101 to control the dc-dc converter to adjust the power flow to the grid. -- The performance of the developed control system investigated both in simulation and experiment. DC power supply is used at generation side and inverter output at grid side is adjusted based on an existing data file in PC. A PI controller is designed which makes sure that power flow is always the same as required by the electrical power dispatch center. -- The applicability of the proposed remote control system based on a 250 watts grid connected inverter is demonstrated through a number of lab tests. The results show the designed control system is capable of remotely controlling the system power of the grid tie inverter.

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