Abstract
A Unified Power Quality Conditioner (UPQC) is designed using a Neutral Point Clamped (NPC) multilevel inverter to improve the power quality. When designed for high/medium voltage and power applications, the voltage stress across the switches and harmonic content in the output voltage are increased. A 3-phase 4-wire NPC inverter system is developed as Power Quality Conditioner using an effectual three dimensional Space Vector Modulation (3D-SVM) technique. The proposed system behaves like a UPQC with shunt and series active filter under balanced and unbalanced loading conditions. In addition to the improvement of the power quality issues, it also balances the neutral point voltage and voltage balancing across the capacitors under unbalanced condition. The hardware and simulation results of proposed system are compared with 2D-SVM and 3D-SVM. The proposed system is stimulated using MATLAB and the hardware is designed using FPGA. From the results it is evident that effectual 3D-SVM technique gives better performance compared to other control methods.
Highlights
In the past few years research on power converters to produce quality supplies with renewable energy systems has been increasing [1]
A Space Vector Modulation system acting as predictive control scheme for the shunt power quality compensator in a three phase three wire and four wire system can reduce the switching losses, minimise the capacitor balancing problem and reduce the total harmonic content in the output [11,12]
In conventional 3-Dimensional Space Vector Modulation (3D-SVM), the 3D cubic plane for 3-level 3-leg Neutral Point Clamped (NPC) inverter has 27 switching vectors placed in 27 vertex points, which has harder switching due to non-redundant switching vectors
Summary
In the past few years research on power converters to produce quality supplies with renewable energy systems has been increasing [1]. In past research on unbalanced systems the neutral current compensation is achieved by using two split capacitors and using 4-leg power converters in place of conventional two level inverters [2]. For medium and large voltage/power compensators, multilevel inverters are more appropriate [3] These multilevel inverters, apart from improving the power quality of the system, minimise the voltage stress across the switches. A three phase four leg NPC inverter system with improved power quality and lesser voltage stress across the switches has not been reported yet. A Space Vector Modulation system acting as predictive control scheme for the shunt power quality compensator in a three phase three wire and four wire system can reduce the switching losses, minimise the capacitor balancing problem and reduce the total harmonic content in the output [11,12]. The series converter injects voltage and the shunt converter injects the current into the system to regulate the voltage and current during unbalanced conditions
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