Abstract
This paper presents an investigation of voltage-and-frequency-(VF-) based battery energy storage system (BESS) controller used in micro grid for analyzing the optimum capability of plant. Microgrid is formed by using three hydropower plants feeding three-phase four-wire load. The proposed controller is used for load balancing, harmonic elimination, load leveling, and neutral current compensation. The proposed BESS controller permits the selection of an optimum voltage level of battery and allows independent current control of each phase. The main emphasis is given on maintaining constant voltage and frequency within the micro grid during transient conditions. Micro grid with power plant and its controller is modeled in MATLAB/Simulink using Power System Blockset (PSB) toolboxes.
Highlights
Existing and new generating plants cause depletion of fossil fuels, global warming, and pollution
Microgenerators are operated parallel to the loads, usually through some voltage-source-inverter-(VSI-) based or currentsource-inverter-based system that can operate in controllable systems
Later on the scheme based on power electronics devices with distributed generation (DG) is used to form micro grid [3]
Summary
Existing and new generating plants cause depletion of fossil fuels, global warming, and pollution. A new concept was introduced in which two inverters are used, one in shunt and another in series with individual DG formsing micro grid [4] The former is used for balancing the voltage and the latter is used for balanced the line current. When micro grid is working in Advances in Power Electronics islanded mode proper synchronization between generators is required, if not so large transient current will flow. A concept of soft connection scheme based on classical zero crossing detector was introduced for synchronization of generators forming micro grid [7]. A new concept was developed by Majumder et al [8], in which high gain angle droop control scheme is used for proper load sharing in micro grid. Further the author concluded that the scheme is useful for islanded and reconnected mode [10]
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