18 Questions
What type of control can be added to the governor in an interconnected power system with tie lines?
reset (integral) control
What information is required for a control system to manage power flow in tie lines?
system frequency and net power flowing in or out over the tie lines
How does the control system recognize a load increase outside the system?
If frequency decreased and net interchange power leaving the system increased
What does the area control error (ACE) represent in the context of an interconnected power system?
The required change in generation to restore frequency and net interchange to desired values
In the tie-line frequency control scheme, what are the two parameters that are weighed by the control mechanism?
frequency deviation (Δω) and net interchange power (ΔPnet int)
What happens if frequency decreases and net interchange power leaving the system decreases?
A load increase has occurred inside the system
What is the main objective of the Primary Automatic Load Frequency Control (ALFC) system?
The main objective of the Primary ALFC system is to control real power to match the demand change and maintain system frequency.
What is the purpose of tie-line control in interconnected power systems?
To enable buying and selling power with neighbouring systems for profitability.
What is the purpose of the Supplementary Control Loop in an Automatic Generation Control (AGC) system?
The purpose of the Supplementary Control Loop in an AGC system is to restore the system frequency to the nominal value after a load change has occurred.
Define Automatic Generation Control (AGC) in the context of power systems.
AGC is a control scheme used to adjust the power output of generators to maintain the balance between generation and load.
What are the three major objectives of an Automatic Generation Control (AGC) system?
The three major objectives of an AGC system are: 1) To hold the system frequency at or very close to a specified nominal value, 2) To maintain the correct value of interchange power between control areas, and 3) To maintain each unit's generation at the most economic value.
How does the Supplementary Control Loop (Reset Governor) in an AGC system differ from the Primary ALFC system?
The Primary ALFC system responds quickly to load changes to match generation with demand and maintain frequency, while the Supplementary Control Loop (Reset Governor) acts to restore the frequency to the nominal value after the initial response.
What are the key components of a Frequency Control Scheme in power systems?
Frequency droop, governor action, and automatic generation control (AGC).
Explain the role of the tie-line model in an interconnected power system under Automatic Generation Control (AGC).
The tie-line model in an interconnected power system under AGC is used to maintain the correct value of interchange power between control areas, which is one of the three major objectives of the AGC system.
How does tie-line modeling contribute to the stability of interconnected power systems?
Tie-line modeling helps in analyzing power flows and stability constraints between interconnected systems.
Explain the concept of Frequency Droop in the context of power system control.
Frequency droop is a control strategy where generators adjust their output based on deviations in system frequency.
How does the frequency control scheme in an Automatic Generation Control (AGC) system work to maintain the system frequency at the nominal value?
The frequency control scheme in an AGC system involves the Primary ALFC system responding quickly to load changes to match generation with demand, and the Supplementary Control Loop (Reset Governor) acting to restore the frequency to the nominal value after the initial response.
How does AGC contribute to the overall stability and reliability of interconnected power systems?
AGC ensures that generation matches demand, helping in maintaining system frequency and stability.
Learn about Automatic Generation Control (AGC) in power systems, including the primary ALFC, steady state deviation, and the supplementary control loop. Understand how AGC is used to restore frequency to nominal value.
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