Abstract
This paper presents an adaptive sliding mode control (ASMC) of an improved power quality standalone single phase microgrid system. The proposed microgrid system integrates a governor-less micro-hydro turbine driven single- phase two winding self-excited induction generator (SEIG) with a wind driven permanent magnet brushless DC (PMBLDC) generator, solar photo-voltaic (PV) array and a battery energy storage system (BESS). These renewable energy sources are integrated using only one single-phase voltage source converter (VSC). The ASMC based control algorithm is used to estimate the reference source current which controls the single-phase VSC and regulates the voltage and frequency of the microgrid in addition to harmonics current mitigation. The proposed ASMC estimates the reference real and reactive powers of the system, which is adaptive to the fluctuating loads. The sliding mode control is used to estimate the reference real power of the system to maintain the energy balance among wind, micro-hydro, solar PV power and BESS, which controls the frequency of standalone microgrid. The proposed microgrid is implemented in real time using a DSP (Digital Signal Processor) controller. Test results of proposed microgrid shows that the grid voltage and frequency are maintained constant while the system is following a sudden change in loads and under intermittent penetration of wind and solar energy sources.
Highlights
HE benefits of an integration of renewable energy sources like wind, solar and micro-hydro with battery energy storage system (BESS) (Battery Energy Storage System) are currently well recognized
If the power demanded by the load is less than the power generated by the self-excited induction generator (SEIG) than the surplus generated power is converted into the DC power using voltage source converter (VSC) and stored into the BESS
The proposed algorithm controls the VSC such that it balances the flow of power among the various energy sources (SEIG, permanent magnet brushless DC (PMBLDC) generator, solar PV-array and BESS), which in turn controls the frequency of the microgrid system
Summary
HE benefits of an integration of renewable energy sources like wind, solar and micro-hydro with BESS (Battery Energy Storage System) are currently well recognized. The design and implementation of an adaptive sliding mode control (ASMC) algorithm [24] of single-phase microgrid system is proposed It consists of three main renewable energy sources such as micro-hydro, wind and solar PV based generation. SEIGs have many advantages over other generators, like simple, brushless, low unit cost, low maintenance, high power/weight ratio, absence of DC excitation etc.In the proposed system the governor-less control of small hydro uncontrolled turbine driven SEIG and wind driven PMBLDC generators, reduces the overall cost and size of the generators significantly It makes the system frequency independent of the mechanical inertia of turbine generator.The proposed single-phase microgrid integrates the renewable energy sources of low power capacities for their optimum utilization. The proposed microgrid is suitable for low power generation using hydro, wind and solar energy to cater to modern nonlinear loads
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