UNIFIED POWER QUALITY CONDITIONER

INTRODUCTION

Unified power quality conditioners (UPQCs) allow the mitigation of voltage and current disturbances that could affect sensitive electrical loads while compensating the load reactive power.

It aims at the integration of series-active and shunt-active power filters.

The main purpose of a UPQC is to compensate for voltage imbalance, reactive power, negative-sequence current and harmonics.

BLOCK DIAGRAM 1

BLOCK DIAGRAM

SHUNT ACTIVE FILTER

CONTROL STRATEGY

Cont…….

This theory, also known as instantaneous reactive power theory.

The p-q theory consists of an algebraic transformation (Clarke transformation) of the three-phase voltages and currents in the a-b-c coordinates to the α-β-0 coordinates, followed by the calculation of the p-q theory instantaneous power components:

Cont…….

p0 = v0 ⋅ i0 instantaneous zero-sequence power.

p = vα ⋅ iα + vβ ⋅ iβ instantaneous real power

q = vα ⋅ iβ − vβ ⋅ iα instantaneous imaginary power 

The power components p and q are related to the same α-β voltages and currents, and can be written together.

These quantities are illustrated in Fig. 4 for an electrical system represented in a-b-c coordinates and have the

SO FAR…

Simulation of upqc in matlab

Block description

GRID

Filter control block

Filter block

SIMULATION RESULTS

SIMULATION RESULTS

Simulation results

WHAT TO DO………………

Design and simulation of series active filter.

Simulation of UPQC.

CONCLUSION

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