distributed power flow controller
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Transcript of distributed power flow controller
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DISTRIBUTED POWER FLOW CONTROLLER FOR COMPENSATING REACTIVE POWER IN
TRANSMISSION SYSTEMS
PRESENTER:KESAVA VARMA
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OBJECTIVES
• To compensate reactive power in transmission line.
• To overcome the disadvantages of Unified Power Flow controller(UPFC).
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INTRODUCTIONThe growing demand and the aging of networks make it desirable to control the power flow in power-transmission systems fast and reliably.The FACTS is defined by “power electronic based system and other static equipment that provide control of one or more ac-transmission system parameters to enhance controllability and increase power transfer capability’’,and can be utilized for power flow control.
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Unified Power Flow Controller
UPFC is a combination of static synchronous compensator (STATCOM)and static synchronous series compensator(SSSC).
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Function Of UPFC:
• The active power exchange takes place through dc link provided in the UPFC.
• The shunt converter controls the voltage of dc capacitor by absorbing or generating active power from the bus.
• The series converter injects voltage with controllable magnitude and phase.
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THE DPFC
Main difference of UPFC and DPFC
1. Eliminating the common dc link2.Distributing the series converter
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DPFC Configuration
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Active Power Exchange Between DPFC Converters
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Simplified Representation Of DPFC
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Operation Of DPFC:
• The shunt converter converts active power in at fundamental frequency to active power at harmonic frequency and gives back to the transmission line.
• Now the series converter converts this active power at harmonic frequency to active power at fundamental frequency.
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DPFC connected to a simple power system
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Additional devices for DPFC
• A delta to star and star to delta transformer is essentailly needed for DPFC.
• Several series converters are neededfor DPFC with individual capacitors.
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DPFC control scheme:
• To control multiple converters, DPFC consists of three type of controllers
• Central control• Shunt control• Series control
• Central converter generates the reference signals for both series and shunt converter
• Each series converter and shunt converter has its own controller. `
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Simulink Model Of DPFC:
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Simulink Model Of Series Converter
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Advantages Of DPFC
• High Control Capability: All the parameters like line impedance , transmission angle and controlled voltage with specific phase angle and magnitude.
• High Reliability: Usage of number of series converters
• Low cost
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