Power generation + pumped power generation

It is urgent to carry out the innovation of technical standards and policy system of hydropower generation to ensure the efficient and sustainable development of hydropower generation. In the future, the new power system objectively requires that the innovative development of hydropower generation must be accelerated, and the existing relevant technical standards and policy systems also need to be corresponding to the innovative development in order to promote the efficient development of hydropower generation. In terms of standards and specifications, it is urgent to optimize the standards and specifications of planning, design, operation and maintenance based on the pilot demonstration and verification based on the technical requirements of the new power system for conventional hydropower stations, pumped storage power stations, hybrid power stations, and water transfer pumped storage power stations (including pumping stations), so as to ensure the orderly and efficient innovative development of hydropower generation. In terms of policies and systems, it is urgent to study and formulate incentive policies to guide, support and encourage the innovation and development of hydropower generation, and it is also urgent to make system designs such as market and electricity price for the conversion of new value of hydropower generation into economic benefits, and encourage enterprises to actively carry out innovation and development technology investment, pilot demonstration and large-scale development.

Innovative development path and prospect of hydropower generation

The innovative development of hydropower generation is an urgent need to build a new type of power system, and it is necessary to adhere to the principle of local conditions and comprehensive policies, and adopt different technical solutions for different types of hydropower projects that have been built and planned. It should not only take into account the functional needs of power generation and peak regulation, frequency regulation and phase regulation, but also take into account the comprehensive utilization of water resources and the construction of adjustable power loads. Finally, the optimal scheme is determined by comprehensive benefit evaluation. By improving the regulation capacity of conventional hydropower and building a comprehensive group of cross-basin water transfer pumped storage power stations (pumping stations), it has significant economic benefits compared with new pumped storage power stations. Overall, there are no insurmountable technical obstacles to the innovation and development of hydropower generation, and the development space is huge, and the economic and environmental benefits are outstanding, which deserves great attention and accelerated large-scale development on the basis of pilot practice.

"Power generation + pumping" mode refers to the use of existing hydropower DAMS and other hydraulic buildings and power transmission and transformation facilities, select a suitable place downstream of the hydropower station outlet to build a rolling dam to form a lower reservoir, add pumping pumps, pipelines and other equipment and facilities, take the original reservoir as the upper reservoir, and increase the pumping function during the off-peak load of the power system on the basis of the power generation function of the original hydropower station. In order to increase the pumped storage capacity of the original hydropower station, the regulation capacity of the hydropower station will be improved (see Figure 1). The lower reservoir can also be constructed separately at a suitable location downstream of the hydropower station. When the lower reservoir is built downstream of the outlet of the hydropower station, the water level control should not affect the power generation efficiency of the original hydropower station. Considering the functional requirements such as optimization of operation mode and participation in phase regulation, the pump should be matched with a synchronous motor. This mode is usually suitable for the functional transformation of the hydropower station in operation, the equipment and facilities are flexible and simple, and it has the characteristics of less investment, short construction period and quick effect.

"Power generation + Pumped power Generation"

Compared with the "power generation + pumping" model, the main difference is that the pump is changed into a pumped storage unit, which directly increases the function of pumped storage of the original conventional hydropower station, so as to enhance the regulation capacity of the hydropower station. The setting principle of the lower reservoir is the same as that of the "generation + pumping" mode. In this mode, the original reservoir can be used as the lower reservoir and the upper reservoir can be built in a suitable place. For newly built hydropower stations, pumped storage units of a certain capacity may be installed in addition to certain conventional generating units. If the maximum output of a single hydropower station is assumed to be P1 and the pumped storage power is increased to P2, the power operation interval of the station relative to the power system will be expanded from (0,P1) to (-P2,P1+P2).