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Nonlinear adaptive normalized Huber control algorithm for 5-level distribution static compensator

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Abstract

This paper proposes a new normalized Huber adaptive control algorithm for shunt compensation. A 5-level cascaded multilevel inverter (CHB-MLI) is controlled as a shunt active power filter (SAPF) unit for a medium voltage distribution system. The proposed algorithm is designed, modelled, and tested to control the SAPF unit under normal and distorted grid conditions. It is employed to extract the fundamental active power component of load current. This extracted effective component is used to generate source reference currents by multiplying with the unit vector template. Furthermore, the switching of CHB-MLI is performed using phase-shifted PWM scheme. The algorithm helps to mitigate the reactive power and unwanted harmonics generated by the nonlinear load. A single-phase scale-down prototype model is developed for experimental investigation and testing purpose in the laboratory. The associated voltage and current sensors and control circuits are controlled by the dSpace 1104 digital microprocessor. Simulation and experimental results show good performance of the proposed algorithm in steady-state and dynamic load conditions. A fair performance comparison is also done with other conventional adaptive algorithms.

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source current (is), load current (iL) and compensating current (ic) wrt PCC voltage (Vs) THD of 2.8%, 30.1% and 1.8% in is, il, Vs

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source voltage (Vs), source current (is), load current (iL) and compensating current (ic)

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Acknowledgement

The authors are thankful to Department of Science and Technology, India.

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  1. Department of Electrical Engineering, Delhi Technological University, New Delhi, Delhi , 110042, India

    Praveen Bansal & Alka Singh

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  1. Praveen Bansal
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Correspondence to Praveen Bansal.

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Appendix

Appendix

1.1 Simulation parameters

Grid supply voltage, Vs = 110 V, nonlinear load of resistance and inductance, R = 10Ω and L = 50mH, dc bus capacitance = 2500 μF, kp = 1.2, ki = 0.1, Vdc-ref = 200 V, interfacing inductor Lf = 3mH, switching frequency fsw = 10 kHz, sampling time = 4 μs.

1.2 Experimental parameters

Grid supply voltage, Vs = 110 V, 1-phase 2-leg diode rectifier as nonlinear load of resistance and inductance, R = 40Ω and L = 8mH, dc bus capacitance = 3000 μF, kp = 1.2, ki = 0.1, Vdc-ref = 200 V, interfacing inductor, Lf = 3mH, switching frequency fsw = 10 kHz, sampling time = 50 μs.

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Bansal, P., Singh, A. Nonlinear adaptive normalized Huber control algorithm for 5-level distribution static compensator. Electr Eng 104, 1635–1648 (2022). https://doi.org/10.1007/s00202-021-01424-0

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