UNIFIED POWER QUALITY CONDITIONER INTRODUCTION Unified power quality

UNIFIED POWER QUALITY CONDITIONER

INTRODUCTION Ø 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. Ø It aims at the integration of series-active and shunt-active power filters. Ø 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……. Ø This theory, also known as instantaneous reactive power theory. Ø The p-q theory consists of an algebraic transformation (Clarke transformation) of the three-phase voltages and currents in the a-bc coordinates to the α-β-0 coordinates, followed by the calculation of the p-q theory instantaneous power components:

Cont……. Ø p 0 = v 0 ⋅ i 0 instantaneous zero-sequence power. Ø p = vα ⋅ iα + vβ ⋅ iβ instantaneous real power Ø q = vα ⋅ iβ − vβ ⋅ iα instantaneous imaginary power Ø The power components p and q are related to the same α-β voltages and currents, and can be written together. Ø 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 Ø GRID

Ø Filter control block

Filter block

SIMULATION RESULTS

SIMULATION RESULTS

Simulation results

WHAT TO DO……………… Ø Design and simulation of series active filter. Ø Simulation of UPQC.

CONCLUSION