In the Balance of Plant (BOP) auxiliary systems of pumped-storage power stations, the medium-pressure compressed air system serves as the core power source. It supports critical technological processes, including water depression for synchronous condenser operation, leakage compensation during runner rotation in air, and gas charging for governor and inlet spherical valve oil pressure tanks. The transient gas supply response, rapid repressurization capability, and weather resistance during extended standby periods are paramount to ensuring 24/7 grid-connection safety and efficient peak-shaving operations.
For domestic large-scale pumped-storage power stations (single-unit capacity ≥300 MW), standard medium-pressure operating conditions require a discharge pressure of approximately 8.0 MPa (80 barg) and a single-unit displacement of 10–13 m³/min. Built with heavy-duty industrial design and engineered for high reliability under harsh operating conditions, the SAUER 6000 series WP6310 water-cooled high-pressure reciprocating compressor from Sauer Compressors represents the ideal solution for these medium-pressure systems. As a strategic partner of Sauer, Greatall provides original imported compressors, localized system integration, and comprehensive lifecycle services.
Core Technical Advantages of SAUER 6000 Series WP6310
Three-Stage Compression and Twin-W Configuration: Optimizing Thermodynamic Efficiency and Mechanical Stress
The WP6310 utilizes a three-stage compression architecture to optimize inter-stage pressure gradients and balance compression ratios. Integrated with a high-efficiency interstage water-cooling system, the discharge temperature of each stage is strictly confined within safe thresholds. The symmetrical layout of the twin-W cylinders, combined with a highly rigid monolithic crankshaft, achieves ideal inertial force balance. This configuration significantly suppresses low-frequency vibration during high-pressure operation, effectively mitigating the risk of mechanical fatigue caused by the station's long-term "standby-to-transient start/stop" cycles.
Heavy-Duty Design and High Dynamic Response: Matching Frequent Synchronous Condenser and Rapid Repressurization Requirements
Pumped-storage units in modern power systems demand frequent transitions among power generation, pumping, and synchronous condenser modes. During water depression for synchronous condenser operation, the compressed air system must inject high-pressure air into the runner chamber within an ultra-short window to evacuate water. The WP6310 features an industrial heavy-duty design capable of continuous operation. Its dynamic pressure regulation system monitors air grid fluctuations in real-time, maintaining discharge pressure variance within ±0.02 MPa. Furthermore, the digital control system, coupled with direct-drive technology, enables second-level loading/unloading responses, perfectly satisfying the transient high-flow air requirements during black starts and emergency standby states.
Localized Lifecycle Lifecycle Assurance
Sauer guarantees original spare parts traceability and availability for over 25 years. Leveraging extensive localized integration experience and a dedicated team of professional engineers, Greatall delivers highly responsive dynamic maintenance and overhaul services, significantly optimizing the Total Cost of Ownership (TCO) for power stations.
Typical Engineering Applications and Proven Track Record
The SAUER 6000 series WP6310 reciprocating compressor packages have demonstrated exceptional operational adaptability and high lifecycle availability across multiple landmark pumped-storage projects in China. Their weather resistance and system stability have been rigorously validated under diverse hostile environments:
● Qingyuan Pumped-Storage Power Station, Guangdong (4×320 MW): As a key energy storage project for China Southern Power Grid, this facility is equipped with four WP6310 compressor packages and complete air storage systems. It provides a robust air source for the pumping and synchronous condenser systems, efficiently matching air demands across the entire process—including unit startup, water depression, and emergency shutdown—thereby enabling efficient energy storage and release.
● Yangjiang Pumped-Storage Power Station (3×400 MW): This ultra-large-scale project features a high hydraulic head (700-meter class) and large single-unit capacity. Operating in a coastal environment characterized by high salt mist and humidity, the WP6310 compressors utilize premium corrosion-resistant materials and precise surface protection technologies. This ensures outstanding resistance to marine corrosion, minimizing environment-induced failure rates and maintenance costs over long-term operations.
● Zhouning Pumped-Storage Power Station (4×300 MW): Serving as the core of the medium-pressure BOP system, the WP6310 compressors fulfill rigid demands for frequent water depression and transient pressure stabilization of the governor system, with all performance metrics exceeding design expectations.
Currently, WP6310 units are widely deployed in numerous national key pumped-storage projects (both operational and under construction), including Shenzhen, Nanning, Zhongdong, Lushan, Yunxiao, Dawu, Lianghekou, Taishan, Yongan, and Mulan. In the construction of modern power systems, they continue to provide steadfast power support for the "stabilizers" and "regulators" of national clean energy.
