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Supply and installation of speed control equipment for Song Pha units – Song Pha Hydropower Plant

Supply and installation of speed control equipment for Song Pha units – Song Pha Hydropower Plant

Table of Content

Project overview

  • Client: Da Nhim Hydropower Joint Stock Company – Ham Thuan – Da Mi.
  • Scope of the project: Supply and installation of speed control equipment for Song Pha units.
  • Solution: Replace the entire old hydraulic and analog electronic speed control system with a new generation of intelligent numerical control system and hydraulic mechanics.
  • Implementation period: September, October, 2022.

Nhà máy thủy điện sông Pha

Pha . River Hydropower Plant

Da Nhim – Ham Thuan – Da Mi Hydropower Joint Stock Company (hereinafter referred to as DDD Company), formerly Da Nhim – Ham Thuan – Da Mi Hydropower Plant, was established on May 21, 2001 facility to merge 2 clusters of Da Nhim – Song Pha Hydropower Plants and Ham Thuan – Da Mi. The project plays an important role in the development of economic activities for the South Central Coast region. Annually, the plant provides an average of 40 million kWh of electricity to the national electricity grid, providing domestic water and serving intensive agricultural farming for the delta of Ninh Thuan province with an area of about 16,000 hectares.

Condition of the factory before the project implementation

Current status before upgrading the speed regulation system of units H1, H3 of Song Pha Hydropower Plant:
  • Units H1 and H3 are over 30 years old, so they are degraded, difficult to operate and cannot meet the current demand.
  • The speed control system of units H1 and H3 is designed by old technology, so it is very difficult to find replacement and repair components.
  • Units H1, H3 of Song Pha hydropower plant with a small capacity of 1.5 MW are not currently required to perform primary frequency regulation, however, according to the requirements of dispatching levels, the plant also needs to be available. ready the primary frequency control function and control modes as another modern speed regulation system, to put this function into operation immediately upon request from dispatching levels in the future.

The solution S5T provides to solve customer problems

From the actual situation of the factory, DHD Company realizes that upgrading and renovating units H1 and H3 is essential and important in this period. In addition, considering that unit 2 has installed the Nexus Oncore speed control system in 2019, it is easy to use, operate stably, efficiently, and convenient for maintenance. After carefully reviewing the bids, the General Meeting of Shareholders decided to continue signing a contract with S5T Company for the bidding package to upgrade the speed control system of the H1 and H3 units in 2022 – with the Nexus Oncore speed control system of the company. Nexus Controls as unit H2. After 1 month of implementation, the construction, testing and commissioning work was completed by the end of October, 2022.
Hướng dẫn vận hành hệ thống điều tốc Nexus Oncore
S5T trains operator manual of Nexus Oncore speed control system for operators of Pha River Hydropower Plant

Results, evaluation after upgrading the speed control system of units H1 and H3

After the project, Song Pha hydropower plant was equipped with a new speed control system for units H1, H3. When put into operation, it can be seen that the existing problems of the plant have been improved clearly, the efficiency is shown by:

  • The new speed control system works quickly, shortening the startup time.
  • The factory’s additional design of Modbus communication with DCS helps to increase the ability to monitor and control the governor system from DCS: direct power from DCS through communication, this direct power setting control mode (MW mode) in parallel with DCS (ALR mode) pulse control mode, so the operator can easily select MW mode to put power directly into the speed control system through Modbus communication or use the same pulse control mode (ALR mode).
  • Units H1 and H3 are equipped with primary frequency modulation for future backup, so whenever there is a request to participate in primary frequency control, units H1, H3 are ready immediately. .
  • The experimental results show that the load shedding when cutting the machine, cutting the pole or simulating the cutting of the grid cutter, the unit responds well, and at the same time does not exceed the large capacity (< 140%) compared to the system without upgrade.
  • Sharp, modern touch screen, very convenient for management, operation, and breakdown analysis.

Đào tạo hướng dẫn sửa chữa hệ thống điều tốc Nexus Oncore

Nexus Oncore Accelerator Repair Manual Training
Not only does it help to upgrade the new modern speed regulator product with the above effects, but the technology transfer training is also highly valued by the S5T contractor. At the end of the project, we were honored to receive positive feedback from customers about product quality and care and support services.
Tổ máy H1, H2, H3 sau khi được nâng cấp hệ thống điều tốc
Units H1, H2, H3 after being upgraded with the speed regulation system
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  • Address: S5T Vietnam Technology and Solution Joint Stock Company.
  • Lot B15, Duong Noi Resettlement Area, Duong Noi, Ha Dong, Hanoi.
  • Tel: 0243 540 1858 – Fax: 0243 540 1859
  • Email:

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