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Introduction
Series Active Filters
Instantaneous power theory for voltage compensation
Simulation results and discussions Shunt active filter controlled with p-q theory
Series active filter controlled with p-q theory
Voltage distortion compensation under a sinusoidal load
current
Conclusion
A. Javadi 2
Summary
Summary:
EPEC 2011
A. Javadi 3
Introduction:
Summary
Introduction
EPEC 2011
A. Javadi 4
Series Active Filters:
Series active filter is usually proposed to solve voltage distortions and other related issues.
They are more competent than shunt compensators as they are able to compensate current issues.
Series Active Filter
Shunt Active Filter
Summary
Introduction
Series Active
Filters:
EPEC 2011
A. Javadi 5
Series Active Filters:
• Similar structure with shunt active filters + connection transformer.
• SSeriesFilter= 3%-10% SLoad , SShuntFilter=30%-70% SLoad
Ac#ve Filter Solu#ons to Power Quality Problems
Ac#ve Filter Connec#on Effect on supply Effect on load
Shunt
Current harmonic filtering
Reac2ve current compensa2on
Current unbalance
Voltage flicker
Series
Current harmonic filtering Voltage sag/swell
Reac2ve current compensa2on Voltage unbalance
Current unbalance Voltage interrup2on
Voltage flicker Voltage flicker
Voltage unbalance Voltage notching
Summary
Introduction
Series Active
Filters:
EPEC 2011
A. Javadi 6
Instantaneous power theory for voltage compensation:
Summary
Introduction
Series Active
Filters:
P-q Theory
EPEC 2011
A. Javadi 7
Instantaneous power theory for voltage compensation:
Summary
Introduction
Series Active
Filters:
P-q Theory
EPEC 2011
Instantaneous powers are divided into an average value and an oscillating portion:
A. Javadi 8
Instantaneous power theory for voltage compensation:
Summary
Introduction
Series Active
Filters:
P-q Theory
EPEC 2011
A. Javadi 9
Simulation results and discussions:
Summary
Introduction
Series Active
Filters:
P-q Theory
Simulation
EPEC 2011
Specifica2on Parameters (Shunt compensa2on) Source 208V , 60 Hz Load 10 kVA , R=7.5 Ω, L= 50 mH
Load series inductance 1 mH Ac2ve filter series inductance 1 mH
Filter Capacitor 10 μF
Shunt current distortion compensation
A. Javadi 10
Simulation results and discussions:
Summary
Introduction
Series Active
Filters:
P-q Theory
Simulation
EPEC 2011
Shunt current distortion compensation
va vb vc ia ib ic
THDiL=21.76%
THDis=1.4%
A. Javadi 11
Simulation results and discussions:
Summary
Introduction
Series Active
Filters:
P-q Theory
Simulation
EPEC 2011
A. Javadi 12
Simulation results and discussions:
Summary
Introduction
Series Active
Filters:
P-q Theory
Simulation
EPEC 2011
Series voltage distortion compensation (expected results, offline simulation)
Three-phase Load voltage
A. Javadi 13
Simulation results and discussions:
Summary
Introduction
Series Active
Filters:
P-q Theory
Simulation
Sinusoidal current
EPEC 2011
Series voltage distortion compensation
Three-phase Load voltage
Three-phase Source voltage with distortion
If the load draws a sinusoidal wave form (which is not almost the case), the SAF based on the p-q theory inject a voltage in order to have a sinusoidal voltage wave form at the load side despite the presence of any perturbation in the source. It will also compensate all the non-active power, including the reactive an oscillating portion of active power, and the source will only supply a constant active power.
If the non active powers are compensated the voltage is then distorted, so this strategy could not satisfy the critical load.
The “instantaneous p-q theory” could not be used for a series active filter and the constant power strategy is not convenient for the series compensation.
By changing the strategy of compensation from a constant power to a sinusoidal wave strategy it could be possible to overcome the issue.
A. Javadi 14
Conclusion:
Summary
Introduction
Series Active
Filters:
P-q Theory
Simulation
Sinusoidal current
Conclusion
EPEC 2011
A. Javadi
EPEC 2011
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