CONTROL DESIGN OF STANDALONE DISTRIBUTION GENERATION SYSTEM IN QUATERNION DOMAIN

Abstract

Relevance. The present paper is devoted to the practical issues of ensuring uninterrupted and quality power supply for standalone industrial facilities and quick response of power supply systems that become increasingly important in the context of continuously growing portion of renewable generation, such as wind turbines, solar photovoltaic arrays, tidal power units, characterized by inconsistency and randomness of power generation periods. At same time, the load also has an unpredictable nature of consumption, which consists in unbalanced connection, abrupt power drops and surges, and the introduction of non-linear consumers, which affects the quality of the voltage in the power supply system. The main aim. The paper presents a method to develop a quick-response control strategy for a standalone three-phase power supply system for mineral mining and processing facilities to ensure the generated balanced voltages with sinusoidal waveforms. Objects: standalone power supply system; PWM four-leg full-bridge inverter, single-/three-phase load. Methods: quaternion algebra, noncommutative multiplication rules for imaginary units, closed-loop control, cascade systems. Results. The authors have developed basic concept covering the organization and implementation of a standalone AC generation system based on three-phase voltage quaternion decomposition into a balanced sinusoidal component and other components caused by amplitude-phase unbalance and nonlinear loads. The described continuous law provides a high speed of instantaneous compensation of distortions at abruptly variable load. Experimental studies were carried out on various kinds and configurations of loads: single-phase, three-phase symmetric, and also two-phase, one phase of which has a non-linear character of current consumption.

Keywords

• standalone power supply system
• voltage source inverter
• single-phase load
• three-phase load
• voltage quaternion