Is it true that the more allowable water consumption of hydropower plants, the smaller the water-coal conversion coefficient?

The water-coal conversion coefficient is actually the ratio of coal and water consumed by power plants to generate the same electricity, so the greater the allowable water consumption, the smaller the water-coal conversion coefficient.

The output formula of hydropower generation is as follows:

P=9.8 1ηHQ

P: Output unit: kW power transmitted by the machine end of the unit.

H: Head unit: m (meter) is the effective head acting on the turbine, which is equal to the difference between the water level of the reservoir and the downstream water level (i.e. the gross head) minus the head loss of the diversion part. The head loss is △ H, which is generally 3%~ 10% of Hg (gross head) according to experience, and the water conveyance channel is short.

Q: Flow unit: cubic meter per second (m3/s). Rated flow of hydraulic turbine in hydropower station.

η: Efficiency of hydro-generator set, including efficiency of hydro-turbine and generator. η is not only related to the types and parameters of turbines and generators, but also varies with the operating conditions of units, and is not a constant value.

Extended data:

In the power system, power plants generally include thermal power plants, hydropower plants, nuclear power plants, wind farms, solar power plants and so on. In areas with poor water resources, thermal power plants account for a large proportion, while in areas with rich water resources and high development level, hydropower plants account for a large proportion, and wind farms and solar energy belong to new energy sources. The main functions of hydropower plants in the power system are as follows:

(1) provides power. The main tasks of hydropower plants are.

(2) Peak shaving. Major hydropower plants with regulating capacity.

(3) frequency modulation. The large unit with reservoir has strong regulation ability, and the frequency in China is 50±0.2hz.

(4) Phase modulation. Have the ability of phase modulation operation, and can participate in reactive power balance of the system according to the requirements of the power grid.

(5) as an accident standby. Because the hydro-generator set has the characteristics of quick start and grid-connected power generation, when the power system suddenly has an accident, it is in urgent need of supplementary power, and the hydro-generator set is often used as an emergency standby unit.

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