Yokogawa DCS controls TGC-1’s major hydro power plant

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Executive Summary

The Pal’eozersk hydro power plant in Russia
The Pal’eozersk hydro power plant in Russia
 

The Republic of Karelia is located in the northwest of the Russian Federation and has many hydro power plants making use of the abundant water resources. The Pal’eozersk hydro power plant was built in 1954 close to the Sun River which flows through Girvas city, with two 12.5 MW units. This is a cascade type of hydro power plant which uses the difference in height of the Sun River.

The owner of the plant, Territorial Generating Company number 1 (TGC-1, also referred to as TGK-1 [Territorial'naya Generiruyushchaya Kompaniya No. 1]), is a regional power generation company affiliated with Gazprom, the biggest gas company in Russia.

TGC-1 owns power plants in the northwest of Russia and 40% of its capacity comes from hydro power plants, with a total capacity of 3,000 MW.

suc-paleozersk-002

Due to the aging of existing equipment which had been in use for more than 50 years, TGC-1 decided to modernize the equipment and replace the aging control, monitoring, and protection systems with Yokogawa’s latest CENTUM VP distributed control system and ProSafe-RS safety-instrumented system engineered by Forus, the local agent of Yokogawa.

suc-paleozersk-003

 

The Challenges and the Solutions

As this area is far from the center of the city, load control is required for island operation in case of a grid shutdown due to a natural disaster, which was difficult to achieve with existing old and awkward hydraulic servo drives for turbine wicket control.

To solve this problem, the existing drives were replaced with redundant motor-driven cylinders and new precise controls. This realized stable load control at less than 3 MW power generation and enabled island operation in case of a natural disaster, which used to cause frequent shutdowns. There has been no problem or shutdown since the plant started operation in December 2015 following the replacement by Forus.

Replacement of drives for turbine wicket control
Replacement with redundant motor-driven electric actuators has brought the following advantages over conventional hydraulic servo drives:

  • Eliminated environmental hazards
  • Higher reliability and long-term stability of turbine control in normal and emergency situations
  • Minimized maintenance and routine manual work, maximized service interval
  • Reduced maintenance budget
  • Greatly improved static and dynamic turbine controllability
  • Tuning flexibility of control modes
  • Highly precise control with positioning accuracy of 0.1%

Before replacement: Hydraulic servo drive
Before replacement: Hydraulic servo drive

After replacement: Electric cylinder actuator with redundant motors
After replacement: Electric cylinder actuator with redundant motors

Speed gear and sensors
Speed gear and sensors

Replacement of mechanical hydraulic controls
The existing mechanical hydraulic controls were replaced with digital electric controls implemented in the CENTUM VP. The new control system with newly installed speed gear and sensors has dramatically improved speed and load control. Full integration with excitation, electrical protection, vibration control, and more systems combined with such beneficial electric actuators has delivered the following benefits:

  • Stable turbine control over a long term and minimized total losses resulting from improper operation by the control and safety systems
  • Major improvements in ecological, technical, and financial performance
  • Unstaffed and remote HPP operation capability
  • Redundant, high-precision electromechanical wicket gate control with the ability to function autonomously for at least one hour during loss of power supply, thanks to accumulators (batteries) provided for guaranteed wicket gate closing in emergency situations
  • Unified control platform throughout all system levels: turbines, safety systems, HPP general equipment, whole HPP, regional control centers, and united control center

Island operation test
Island operation test

Full integration with electrical equipment
In addition, the scope of modernization included the supply of new electrical equipment such as variable frequency drives, generator protection relays, and excitation system. This enabled:

  • Full integration with excitation, electrical protection, vibration control, and other systems
  • Active and reactive power group control implemented in a standard field control station without upper-level computer or server
  • Four levels of emergency protection: excitation system and generator electrical safety protection, turbine control system protection, SIL-3 ProSafe-RS system, emergency stop buttons for use at undesirable pressure

Operation graphic window
Operation graphic window

 

Customer Satisfaction

TGC-1 operators are satisfied with the result of the replacement. The HPP cascade general manager Evgeniy Lopatin commented, “Before the replacement, we were skeptical about whether Yokogawa could complete this project or not, but our fears proved to be unfounded. After system replacement, we found no malfunction. Also we have suffered no shutdown during operation even in island operation. We are very satisfied with the new system, and Forus’s and Yokogawa’s work. Various companies visit our hydro power plant to see it working thanks to such a successful project”.

Pal’eozersk HPP operators and project members
Pal’eozersk HPP operators and project members

 

업종

  • 전력

    1970년대 중반, Yokogawa는 EBS 전기 제어 시스템 (EBS Electric Control System)의 출시와 함께 전력 사업에 진출했습니다. 그 이후로 Yokogawa는 전 세계 고객에게 최상의 서비스와 솔루션을 제공하기 위한 기술과 역량의 개발을 꾸준히 지속해 왔습니다.

    Yokogawa는 역동적인 글로벌 전력 시장에서 더욱 적극적인 역할을 수행하기 위해 글로벌 전력 솔루션 네트워크를 운영했습니다. 이로 인해 Yokogawa 내에서 보다 긴밀한 팀워크가 가능해져서 글로벌 리소스와 업계 노하우를 하나로 모았습니다. Yokogawa의 전력 산업 전문가들은 각 고객에게 정교한 요구 사항에 가장 적합한 솔루션을 제공하기 위해 협력합니다.

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Related Products & Solutions

  • SIS (Up to SIL 3) ProSafe-RS

    ProSafe-RS는 IEC 61508에 명시된 SIL(Safety Integrity Level) 3을 충족하는 것으로 독일 인증 기관(TÜV)의 인증을 받은 안전 계측 시스템입니다.

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