Power Quality Enhancement in Residential Smart Grids through Power Factor Correction Stages

Power Quality Enhancement titles

ABSTRACT:

The multiplication of non-direct loads and the expanding entrance of Distributed Energy Resources (DER) in Medium-Voltage (MV) and Low-Voltage (LV) appropriation frameworks, make it progressively hard to keep up the power quality dimensions in private electrical matrices, particularly on account of frail networks. Most family unit apparatuses contain a regular Power Factor Corrector (PFC) rectifier, which augments the heap Power Factor (PF) however does not add to the control of the voltage Total Harmonic Distortion (THDV ) in private electrical matrices. This original copy proposes an alteration for PFC controllers by adjusting the activity mode relying upon the deliberate THDV . Accordingly, the PFCs work either in a low current Total Harmonic Distortion (THDI ) mode or in the customary resistor emulator mode and add to the direction of the THDV and the PF at the conveyance feeders. To demonstrate the idea, the alteration is connected to a current sensorless Non-Linear Controller (NLC) connected to a solitary stage Boost rectifier. Trial results demonstrate its execution in a PFC front-end arrange working in Continuous Conduction Mode (CCM) associated with the lattice with various THDV

 

BLOCK DIAGRAM:

 

 Fig. 1. Residential LV grid with household appliances feed through conventional AC/DC stages (without the proposed operation mode selector) and the proposed PQE controller.

 EXPECTED SIMULATION RESULTS:

 

 

Fig. 2. Experimental results of PQE PFC at 50 Hz. Voltage and current waveforms in a) resistor emulator mode (k = 0), b) sinusoidal current mode (k = 1) and c) measured spectra in both operation modes.

Fig. 3. Experimental results of PQE PFC at 60 Hz. Voltage and current waveforms in a) resistor emulator mode (k = 0), b) sinusoidal current mode (k = 1) and c) measured spectra in both operation modes.

Fig. 4. Experimental results of PQE PFC at 400 Hz. Voltage and current waveforms in a) resistor emulator mode (k = 0), b) sinusoidal current mode (k = 1) and c) measured spectra in both operation modes.

CONCLUSION:

The outcome on the electrical power nature of associating family unit apparatuses to the matrix through PFC stages has been surveyed considering distinctive THDV situations. As has been appeared (17) and (23), there are conditions under which sinusoidal current utilization results in preferable PF at the PCC over with resistor emulator conduct, regularly thought to be perfect for PFC stages. An alteration of the transporter flag of NLC controllers connected to PFC stages is intended to inspire sinusoidal information current in spite of the information voltage bending. The line current estimation with no communication with the power arrange executes the NLC with high commotion invulnerability. The advanced execution of the non-straight controller is suitable to characterize the bearer and to incorporate extra decrease of the present twisting relying upon the application. The power quality enhancement controller can be connected to relieve the impact of nonlinear loads inside family apparatuses on private electrical frameworks. The task method of the computerized controller can be self-governingly balanced through the privately estimated THDV , without additional hardware. The client or a THDV edge identification chooses the helpful conduct (either resistor emulator or unadulterated sinusoidal current). Test results acquired with high THDV (over 5 %) affirm the practicality of the power quality enhancement controller in both sinusoidal present and resistive emulator modes.

 

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