SRF based current controller using PI and HC regulators for DSTATCOM with SPWM switching

•Compensation of unbalanced nonlinear loads by DSTATCOM with dq0 current controller using PI and HC regulators.•Reduced tracking error between reference and actual filter currents (injected by VSI) using harmonic compensation regulator.•Load neutral current compensation with 0-axis current controlle...

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Bibliographic Details
Published in:International journal of electrical power & energy systems 2015-05, Vol.67, p.87-100
Main Authors: Geddada, Nagesh, Mishra, Mahesh K., Manoj Kumar, M.V.
Format: Article
Language:English
Subjects:
Compensation
DC link voltage
DSTATCOM
Harmonics
HC regulator
Integrators
Inverters
Matlab
Power quality
Pulse duration modulation
Regulators
SPWM
Switches
Switching
Voltage source inverter
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Summary:•Compensation of unbalanced nonlinear loads by DSTATCOM with dq0 current controller using PI and HC regulators.•Reduced tracking error between reference and actual filter currents (injected by VSI) using harmonic compensation regulator.•Load neutral current compensation with 0-axis current controller to achieve balanced compensated source currents.•VSI switching pulses at 10kHz frequency using SPWM control and LC filter for eliminating ripple from source voltage, current. This paper presents Distribution Static Compensator (DSTATCOM) for compensation of unbalanced nonlinear load with dq0 current controller (using proportional integrator and harmonic compensation regulators) and Sinusoidal Pulse Width Modulation (SPWM) switching. The dq0 current controller is implemented in Synchronous Reference Frame (SRF) rotating at fundamental frequency and consists of Harmonic Compensation (HC) regulator (realized by sum of Sinusoidal Signal Integrators (SSI)) in parallel to Proportional Integrator (PI) regulator. The SSI provides high gain to specified tuned harmonic frequency and helps in improving filter current tracking performance for harmonic load current compensation. Each SSI in fundamental rotating dq0 reference frame can simultaneously compensate for two load current harmonics and thereby reducing the computational effort compared to SSI in stationary reference frame. Neutral current compensation, which is required for compensating unbalance in load, is carried out through 0-axis controller. SPWM switching strategy results in switching of inverter switches at constant frequency. This will simplify the design of inverter output filter (L/LC), reduces stress on switches and switching noise. Simulation studies of DSTATCOM load compensation using dq0 current controller with interface L and LC filters is carried out in Matlab/Simulink and the corresponding results are presented. Experimental studies are carried out on three phase DSTATCOM prototype using dSPACE 1104 with Matlab Real Time Interface (RTI).
ISSN:0142-0615
1879-3517
DOI:10.1016/j.ijepes.2014.11.016