FREQUENCY ACTUATED LOAD
SHEDDING WITH AUTO TRIPPING
During the last few years, there has been expanded effort throughout t...
It is an elementary case of ‘power economics’, load demand versus generation
supply. When a power system is in stable oper...
Proposed System:
To overcome the above mentioned scenario We have implemented a
Embedded system based frequency actuated l...
Block Diagram:

RS232

Power
Supply
Unit

PIC
Microcontroller
PIC 16F877

Signal Conditioning
Unit (FWPR)

Alarm
Driver

P...
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-IEEE PROJECTS EEE ABSTRACT-Frequency actuated load shedding with auto tripping

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-IEEE PROJECTS EEE ABSTRACT-Frequency actuated load shedding with auto tripping

  1. 1. FREQUENCY ACTUATED LOAD SHEDDING WITH AUTO TRIPPING During the last few years, there has been expanded effort throughout the country to install frequency actuated load shedding programs for the purpose of providing means to safeguard a power system should a condition of declining frequency occur. Hand in hand with a load shedding program a convenient means must be provided for restoring load after the system returns to a normal state. To ensure system stability and availability during disturbances, industrial facilities equipped with on-site generation, generally utilize some type of load shedding scheme. In recent years, conventional underfrequency and PLC-based load shedding schemes have been integrated with computerized power management systems to provide an “automated” load shedding system
  2. 2. It is an elementary case of ‘power economics’, load demand versus generation supply. When a power system is in stable operation at normal frequency, the total mechanical power input from the prime movers to the generators is equal to the sum of all running loads, plus all real power losses in the system. The frequency conditions of the overall system will directly depend on the amount of active power that the generator prime movers could deliver to the system. Also, the stored energy of the prime movers plays an important roll on the system behavior. This stored energy varies drastically from gas, thermal, to hydro units. To halt the drop in frequency, it is necessary to intentionally, and automatically disconnect a portion of the load equal to or greater than the generation deficiency in order to achieve balanced power economics while maintaining system stability. Automated load shedding systems are necessary for industrial power systems since sudden disturbances can plunge a system into a hazardous state much faster than an operator can react. These automated schemes must be designed and implemented to possess in-depth knowledge of system operating parameters and must rely on time sensitive monitoring and control communication networks in order to achieve the desired outcome of fast and optimal load shedding at the onset of a disturbance.
  3. 3. Proposed System: To overcome the above mentioned scenario We have implemented a Embedded system based frequency actuated load shedding scheme, which constantly monitors the change in frequency in the substation, and disconnects the loads according to the priority. Hardware modules 1. PIC Microcontroller 2. PT and CT for Voltage and current sensing 3. PT for Frequecny sensing 4. Processing circuits 5. Relays for Tripping loads 6. RS232 interface Software 1. MPLAB IDE 2. Hitech C 3. Visualbasic 6.0
  4. 4. Block Diagram: RS232 Power Supply Unit PIC Microcontroller PIC 16F877 Signal Conditioning Unit (FWPR) Alarm Driver POWER Alarm Relay Drivers PT CT PT Load 3 Voltage Current Frequency Load 1 Load 2

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