New energy coupling thermal power generating unit power generation, energy storage and peak regulation combined system and operation method

Abstract

The invention discloses a new energy coupling thermal power generating unit power generation, energy storage and peak regulation combined system and an operation method. The system comprises a solar power generation device, a wind power generation device, a lithium battery, a power station boiler, a high-pressure turbine, a low-pressure turbine, a generator, a low-temperature heater, a high-temperature heater and a power grid. The solar power generation device is divided into two paths, one path is communicated with the lithium battery, and the other path is communicated with the grid; the wind power generation device is divided into two paths, one path is communicated with the lithium battery, and the other path is communicated with the power grid; an outlet of the power station boiler sequentially communicates with the high-pressure turbine and the low-pressure turbine, and an outlet of the low-pressure turbine is sequentially communicated with the low-temperature heater and the high-temperature heater; the generator is connected with the low-pressure turbine; the output end of the generator is divided into two paths, one path is communicated with a power grid and the other pathis communicated with lithium batteries. Under the condition that wind power generation or solar power generation is sufficient and stable, according to the first scheme, all power generation capacities are directly sent into a power grid to be used by users, and according to the second scheme, part of electric quantity is input into the lithium battery for energy storage through the inverter.

Description

technical field [0001] The invention belongs to the field of deep peak regulation in thermal power plants, and in particular relates to a new energy coupled thermal power unit power generation and energy storage peak regulation combined system and operation method. Background technique [0002] With the changes in the national power policy in recent years, the main functions of thermal power plants have also changed at the same time, from the main force of power supply to participating in deep peak regulation in cooperation with the power grid. At the same time, the state has issued a deep peak-shaving electricity price subsidy policy, which has greatly stimulated the enthusiasm of thermal power plants to carry out deep peak-shaving transformation of units. At present, thermal power is facing the risk of structural overcapacity, and new energy is facing great consumption pressure. Thermal power is bound to make way for the development of new energy. Thermal power units are...

AI Technical Summary

Problems solved by technology

For the "Three Norths" region, the conflict between wind and fire is particularly prominent during the heating period. The period of the best wind resources coincides with the winter heating period. In addition, the proportion of thermal power units in some provinces is too high, and other types of peak-shaving power sources are relatively scarce. The increasing demand for heat supply and the continuous increase in installed capacity of clean energy have resulted in very limited peak shaving space

Especially in Northeast China, the majority of thermal power is combined heat and power units, and the peak-shaving capacity is only 10%, which affects the consumption of new energy stocks and the incremental development of new energy. The hard gap in peak-shaving capacity has caused severe power shortages in some areas. , so that the thermal power unit can only achieve deep peak regulation through transformation

[0003]At present, the units involved in deep peak regulation deviate from the design value for a long time, resulting in a decrease in the safety and economy of the units

Judging from the technologies adopted and the practice of transformation, the transformed units have to varying degrees the problems of boiler low-load stable combustion and the safety of hydrodynamic cycle, the problems of full-load operation of denitrification devices and low-load cooling of steam turbines, long-term low-load and rapid The flexibility of the control system when the load changes, the problem of equipment operation cycle and life attenuation, and the thermoelectric decoupling of the heating unit all need further research and optimization.

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