Abstract
In high power medium voltage applications, the utilization of 5-H Bridge Multi-Level Inverter (MLI) has grown vastly in recent years. The 5-H Bridge MLI can effectively control link voltage as well as power factor. However, the inverter imparts harmonics owing to the high switching frequency. Hence Inductance Capacitance Inductance (LCL) filter is implemented at its output to mitigate harmonics in presence of non-linear load. It’s of highly important to choose LCL parameters wisely in order to attain good filtering effect. This work investigates the application of 5-H Bridge MLI with LCL filter at the output for efficient integration of renewable energy sources on to the grid. A modified fuzzy heuristic approach is used to solve LCL power filter optimization problem at output of 5-H Bridge Multi-Level Inverter. Subject to the constraint’s harmonic distortion and losses of the inverter, multi objective optimization problem is solved to obtain LCL filter optimal values. The optimized LCL filter design was applied to a grid connected cascaded H-bridge MLI of rating 4.5 MW, 11 kV. MATLAB-Simulink is utilized for modelling and simulating the system. The results showed that the system is more efficient and generic. dSPACE Hardware in Loop (HIL) test system was used to verify the efficacy of the prototype system.
Highlights
Other than ever increasing global power demand, shift towards electric vehicles to reduce greenhouse effect plays a key role in increased deployment of solar and wind energy systems in future [1]
Fuzzy- GA based optimization was applied for LCL filter design in order to integrate renewable energy optimally
Once the optimized LCL filter was introduced the individual harmonics of the output voltage was reduced below 1% apart from the 3rd harmonics which was under 2%
Summary
The world energy demand keeps increasing whereas the availability of conventional sources is on down trend. In order to maintain the system stability, it is highly essential to maintain the system harmonics within a standard limit as mentioned in IEEE-519 This in turn mandates effective designing of output filter and inverter for optimal grid connection of renewable energy sources [2]. Voltage source based Multi-level inverter can be applied for effective renewable energy integration to the grid in high power-medium voltage applications. The third order LCL filter which doesn’t have any of the above stated issues associated with the other two topologies is preferred for high power medium voltage applications [4,5]. This work proposes a simple optimization model using improved fuzzy – genetic algorithm [12] approach to design LCL filter at the output of 5-H BMI for effective integration of renewable energy system on to the grid
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