An automatic power factor controller (APFC) is designed to transfer data between the system operator and the power unit automatic control systems to ensure power unit participation in the automatic secondary power and frequency control.

APFC terminal structure

  • Panel workstation mounted on the cabinet door
  • 2 built-in fan-free servers (main and backup)
  • 2 commercial-type commutators (main and backup)
  • 2 REGUL R600 programmable logic controllers (main and backup), each with a
  • 24-V DC power supply module
  • R600 CU 00 061 central processor unit
  • Communication processor module with 4 RS-485 ports supporting Modbus RTU and IEC 61870-5-101 protocols
  • 32-channel 24-V DC digital input module with group-input channel galvanic isolation
  • Power supply, protection, and lighting and cooling equipment

REGUL R600 functions

  • Implementation of the automatic secondary power and frequency control and long-term turbine ramping to minimum load algorithms
  • Simultaneous cyclic bilateral teledata exchange via the main and backup RS-485 interfaces from the automatic load control system of combined cycle power plant 1 (CCP1) and CCP2 units via a Modbus RTU protocol at a speed of at least 9,600 bit/s
  • Simultaneous cyclic bilateral teledata exchange via main and backup communication channels with the central automated frequency and power regulation system via IEC 61870-5-104 protocol
  • Reception and processing of long-term turbine ramping commands from the emergency and control signals’ transmission unit alarm system (voltage-free output)
  • Enabling of exchange cycle between automatic load control and computer-controlled information complex in less than 1 s
  • Data transfer to the corresponding servers
  • Internal clock synchronization with the astronomical clock in the power plant’s LAN via the NTP protocol
  • Binding of each telemeasurement and telesignal to the astronomical time with an accuracy of at least 100 ms
  • Monitoring of communication channel status with adjacent systems, channel failure alert logging, and the formation of a communication channel status signal for those systems
  • Automatic switching of data exchange in case of a channel failure alert or blockage of data transfer between adjacent systems, in the event of a two-channel failure operating in the same direction as the data transfer
  • Automatic self-check and generation of a corresponding alert

Server functions

  • Reception of parameters and diagnostic data of the adjacent systems from the REGUL R600 controller via the ARTI3 protocol
  • Reception of diagnostic information from switches via the SNMP protocol
  • Data archiving of changes in the parameter accumulation data from adjacent systems
  • Archiving of events on the appearance and disappearance of non-validated data
  • Archiving of events related to the functioning of the automatic power and frequency control software and hardware, including those related to software and hardware modifications
  • Storage of archived data for a period of at least three months
  • Data redundancy on different servers with automatic synchronization between them
  • Internal clock synchronization with the astronomical clock in the power plant’s LAN via the NTP protocol with an accuracy of at least 100 ms
  • Creation of text files either automatically or upon request in the format approved by the Interregional Dispatch Office, containing rated primary-frequency control parameter changes at a one-second interval
  • Transfer of archived rated primary-frequency control files to the Interregional Dispatch Office through main or backup communication channels via the FTP protocol
  • Systems data representation on the workstations of automatic secondary power and frequency control, rated primary frequency control systems,and the power plant’s SCADA system

Workstation functions
Data showing

  • The system function in the form of tables, graphs, and protocols
  • The status of the automatic secondary power and frequency control terminal software and hardware

Система Orphus