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Application Cases of the Comprehensive Monitoring System for Hydropower Stations
Release date:
2020-05-14
The Dahhekou Hydropower Station is located on the Datan section of the Apeng River, within the territory of Cangling Town, Youyang County, Chongqing Municipality. It is the eighth hydropower station planned for the main stream of the Apeng River, with the Xizangyan Power Station upstream and the Tizidong Power Station downstream. The station connects to the tailrace of the Xizangyan Hydropower Plant and has an installed capacity of 3 × 27.5 MW, with its primary function being power generation.
Application Case – Dahhekou Hydropower Station
Project Overview >>>
The Dahhekou Hydropower Station is located on the Datan section of the Apeng River, within the territory of Cangling Town, Youyang County, Chongqing Municipality. It is the eighth hydropower station planned along the main stream of the Apeng River, with the Xiangziyan Power Station serving as the upper cascade and the Tizidong Power Station as the downstream one. The station connects to the tailrace of the Xiangziyan Hydropower Station, and its installed capacity is 3 × 27.5 MW, with the primary task of power generation.
The power station is the largest among the nine-stage development projects on the Apeng River, serving as the eighth-level facility (with the seventh-level Xiangziyan Power Station, the sixth-level Qilitang Power Station—currently planned—, the fifth-level Yutan Power Station, and the fourth-level Zhoubai Power Station). The basin area is Covering an area of 4,619 square kilometers, the river boasts a multi-year average flow rate of 133 cubic meters per second and an annual runoff volume of 4.2 billion cubic meters. The project features a concrete hollow gravity dam with an underground powerhouse, housing three generator units each rated at 27.5 megawatts. The river-blocking dam is of the sluice-gate type, standing 85 meters high with a reservoir capacity of 115 million cubic meters. Its crest is equipped with five spillway gates measuring 11 meters by 15 meters each, capable of safely discharging a once-in-500-year super-flood event. The power station operates at a normal reservoir elevation of 385.0 meters, with a minimum operating level of 369.0 meters. The designed head is 55 meters, ensuring a guaranteed output of 13.6 megawatts and generating an annual electricity production of 375 million kilowatt-hours.
Electrical Main Connection: Three hydro-generators (each with a capacity of 27.5 MW) are connected in unit configuration with three main transformers, each rated at 31,110 kVA. The generators operate at a rated voltage of 10.5 kV. The power station’s outgoing line voltage is 110 kV, with a total of four circuits leading to Jumuling Substation, Longtan Substation, Tizidong Hydropower Station, and Ziziyuan Hydropower Station, respectively. On the 110 kV side, a single-busbar sectionalized connection scheme is employed.
This power station has undergone an automated technological upgrade based on the principle of "unmanned (minimal staffing) operation and monitoring." After the automation transformation, it should fully align with the overall design concept of "unmanned (minimal staffing) operation and monitoring." The station now features a fully computerized monitoring system for control purposes. Once the cascade hydropower station control center for the entire river basin is completed, centralized monitoring and operation of this power station will be seamlessly integrated into the basin-wide control system.
Cost-effective redundancy solution >>>
- The system employs a dual-CPU hot-standby redundancy scheme, achieving both CPU and network redundancy to meet the PLC system redundancy requirements of medium- to large-scale power plants. The hot-standby redundant CPUs are housed within a single rack, effectively addressing control cabinet space constraints while also reducing system costs.
- Adopting PPM pulse modulation and MODBUS TCP network time synchronization;
- The auxiliary system employs a standalone CPU equipped with an Ethernet interface, enabling seamless interconnection and communication across the entire plant system.
Application Case – Yunnan Jidu River Second-Stage Hydropower Station
Project Overview >>>
The Jidu River Second Hydropower Station, operated by Yunnan Lushui County Xinyuan Jidu River Power Generation Co., Ltd., is located on the lower reaches of the Jidu River in Chenggan Township, Lushui County, Nujiang Lisu Autonomous Prefecture, Yunnan Province. The power station's main facility is approximately 3 km from Chenggan Township and about 42 km from Liuku Town, the seat of the Nujiang Prefecture government. The project site is situated on the left bank of the Nujiang River. This hydropower station employs an intake-type development approach, with a diversion flow rate of 6.0 m³/s and a designed head of 254.30 meters. It is capable of delivering a guaranteed output of 4.33 MW, generating an annual electricity output of 66.037 million kWh, corresponding to an annual utilization rate of 5,241 hours.
Single-CPU Dual-Network Solution >>>
Application Case – Guizhou Moziwan Hydropower Station
Project Overview >>>
The Moziwan Power Station is located within the territory of Yanhe Tujia Autonomous County, on the lower reaches of Batuo River—the first-level tributary on the right bank of the Wujiang River. It is the third stage in the cascade development of the Batuo River and also the last power station within Yanhe County, situated a certain distance from the county seat. 30 km. The Moziwan Power Station is designed as a Class IV, Grade IV structure. The reservoir area upstream of the dam site covers a watershed of 589.7 square kilometers, with a total storage capacity of 11.4 million cubic meters. The station is designed for a head of 30.5 meters and a rated flow rate of 9.5 cubic meters per second. It features two turbine-generator units, each with a capacity of 2,500 kW, generating an annual output of 2,490,000 kWh. Electricity is transmitted via a single 35 kV transmission line, spanning 12 km in length, to the 35 kV substation located in Zhongjie Township, Yanhe County.
Single-CPU Single-Network Solution >>>
Application Case – State Grid Sichuan Aba Prefecture Yuanyangqiao and Yuntun Power Stations
Project Overview >>>
By the end of 2004, Songpan County had developed hydropower resources and completed its "Rural Grid Upgrade" project. The county now boasts 24 small hydropower stations with a total of 35 generating units. Among these, four power plants are interconnected, contributing 8 installed units totaling 6,375 kW to the county's grid, generating an annual output of 3,086 MWh. Notably, the county’s key hydropower facilities include the Yuanyangqiao Station (with two 600-kW units), the Yuntun Station (equipped with two 1,250-kW units), the Hongqiaoguan Station (featuring two 250-kW units), and the Shuzhuba Station (boasting three 250-kW units).
Cost-effective single-CPU dual-network solution >>>
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