Abstract
This paper involves the investigation of new techniques for the automatic load frequency control of islanded Microgrids. Microgrids are being established as a part of smart grid environment. In modern power systems, smart grid represents the solution for many of traditional power system problems such as frequency fluctuations. Frequency fluctuations have negative consequences in terms of electrical equipment life, production cost and production losses relative to costumers and electricity producers. So, the frequency of power system must be kept in acceptable range. In order to operate a power system with fixed frequency, it is necessary to always maintain a balance between the generation and the consumption of active power. The frequency droop control methods are widely used to control active power and frequency of the parallel synchronous generators in the traditional power grid. At present, this method has also been applied to the control of parallel inverters to share the load demand in proportion to their ratings. In order to improve the frequency control of traditional droop control technique applied in islanded microgrid, It is proposed to investigate the Decoupled Trigonometric Saturated (DTS) and fuzzy droop control techniques on islanded microgrids which uses meshed parallel inverter systems. To verify the performance of the proposed ALFC based on Decupled trigonometric saturated controller, fuzzy PI controller the MATLAB/SIMULINK environment is used.
Highlights
Structure” as shown in Fig. 1 (a)
Guerrerod [10] have proposed a novel droop control based on Decoupled Trigonometric Saturated (DTS) controller for stable power sharing applied to meshed parallel inverter systems in islanded microgrids
When the instantons active power measured between P0 and P1, the droop coefficient adjustment follows the linear droop characteristic just like conventional droop controller. but when the load is cut at a large load and the instantons power measured between P1 and Pmax, the proposed method can adaptively change the droop coefficient, and effectively prevent the frequency from crossing the boundary compared with the conventional droop characteristic and destabilizes the system
Summary
Microgrids (MG) are discrete electric networks consisting of small scale power sources, distribution network, load, storage element, MG controller and power conversion system (PCS)[1]. This method uses traditional droop control method to simulate the operation characteristics of the parallel synchronous generators in the traditional power grid, using the frequency of the generator terminal voltage At present, this method is applied to the control of parallel inverters to share the load demand without communication infrastructure. Guerrerod [10] have proposed a novel droop control based on Decoupled Trigonometric Saturated (DTS) controller for stable power sharing applied to meshed parallel inverter systems in islanded microgrids. It is proposed to investigate the effectiveness of the Decoupled Trigonometric Saturated (DTS) and the fuzzy droop control techniques in the load-frequency control of islanded microgrids using meshed parallel inverter systems.
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