Main Participants: ZHANG Jianming, LIU Tongan, WANG Cong, ZHANG Zhiyu, LI Na, ZHAO Wei, ZHENG Chu’ai, HOU Rui
With the further development of China’s hydropower resources, a large number of hydropower plants began to be constructed and gradually put into service, with increasing installed capacity of hydroelectric generating units and single unit capacity. The rapid development of renewable energy also leads to a more frequent participation of the hydroelectric generating units in peak shaving and frequency regulation, which puts forward new requirements for the functions, regulating performance indexes and performance tests of the hydraulic turbine governing system.
In order to strengthen the coordination of power grid and power source, improve power quality and further standardize the functions, performance indexes and test items of hydraulic turbine governing system, the project team has been leading the formulation, revision and translation of technical standards for hydraulic turbine governor and grid-related tests since 2010.
Fig. 1 Core Control Components of Hydraulic Turbine
· Having disclosed a method for measuring the flow inertia time constant Tw of the water diversion system of turbine that solves the problem that the industry has long been unable to measure the Tw; proposed a new test method for the servomotor response time constant Ty of hydraulic turbine governor which has a wide range of applications and is easy to operate; put forward a new speed dead band index of governor static characteristic, replacing the unreasonable previous index that had been used for decades.
· Having established a simulation model of the servo system of hydraulic turbine governor with higher accuracy, improved the simulation model of hydraulic turbine to raise the modeling and simulation accuracy of the turbine and governing system; proposed a test method for primary frequency regulation of hydroelectric generating sets, which is widely used in engineering tests.
· Being the first to propose the verification index and test method of isolated grid performance of hydroelectric generating units. This method reduces the risk of isolated grid test of hydroelectric generating units and improves the units’ isolated grid operation capability.
Ten series standards for hydraulic turbine governing system have been completed, including Technical Guide for Hydraulic Turbine Regulating System in Grid (DL/T 1245-2013), Code of Operation and Maintenance for Hydraulic Turbine Regulating System and Devices (DL/T 792-2013), Design and Application Guide for Hydraulic Turbine Governing System (DL/T 1548-2016), Code of Electro- hydraulic Regulating System and Unit for Hydraulic Turbine(DL/T563-2016), Regulating and Testing Guide of Electro-hydraulic Regulating System and Device for Hydraulic Turbines (DL/T 496-2016), Technical Guide for Modeling and Testing of Hydraulic Turbine Governing System (DL/T 1800-2018), Specification of Test and Real-time Simulation Device for Hydraulic Turbine Governing System(DL/T 1120-2018),Technical Code for Small and Medium-sized Hydraulic Turbine Governing Systems (SL 755-2017), Specification of Hydraulic Turbine Governing Systems (GB/T 9652.1-2019) and Testing Specification of Hydraulic Turbine Governing Systems(GB/T 9652.2-2019), and have been widely used in power dispatching institutions, hydropower plants, governor manufacturers and testing agency. The applications are mainly in the following forms:
1. The hydropower plant evaluates the performance indexes of the turbine governing system according to the standards.
2. The power dispatching institution conducts the grid-related management and evaluation of grid-connected hydropower stations according to the standards.
3. Equipment manufacturers produce qualified products according to the technical indexes required by the standards.
4. The testing agency carries out the performance tests, primary frequency regulating performance optimization and turbine governing system modeling tests according to the test methods specified in the standards.
