Photo-thermal and photovoltaic complementary cooperative power generation system and operation method

Abstract

The invention discloses a photo-thermal photovoltaic complementary cooperative power generation system and an operation method, the photo-thermal photovoltaic complementary cooperative power generation system comprises a photovoltaic power station, a photo-thermal power station, an electric heating system, a confluence system, a control system and a power grid, the photovoltaic power station comprises a photovoltaic array and an inverter, and the photo-thermal power station comprises a photo-thermal heat collection system, a heat storage system and a power generation system; and the output endof the photovoltaic array is connected with a power interface of the electric heating system and the confluence system through the inverter, the photo-thermal heat collection system is connected withthe heat storage system, the heat storage system is connected with the power generation system, the output end of the power generation system is connected with the confluence system, and the controlsystem is connected with the control end of the confluence system. The output end of the confluence system is connected with the power grid. According to the photo-thermal photovoltaic complementary cooperative power generation system and the operation method, photovoltaic and photo-thermal complementary cooperative power generation can be achieved, and the self-adjusting capacity is high.

Description

technical field [0001] The invention belongs to the technical field of solar power generation, and relates to a photothermal photovoltaic complementary synergistic power generation system and an operating method. Background technique [0002] As the proportion of renewable energy installed capacity and power generation in the overall power installed capacity and power generation continues to increase, about 150 countries around the world have set specific targets for renewable energy power generation, mainly focusing on wind power and solar power. In order to achieve the goal of increasing the installed capacity of non-fossil energy to 50% at the end of the "14th Five-Year Plan" period, the greenhouse gas emissions (maybe) reach a peak, and then the emissions will decrease year by year, and the quality of wind power and solar power will be improved. The consumption ratio of wind power and solar power is an important issue to be solved at present. [0003] Solar power genera...

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Problems solved by technology

[0007] Chinese patent CN110429667A proposes a cuckoo search-based capacity allocation method for photothermal photovoltaic bundling power generation systems, which can achieve the smallest output standard deviation of photovoltaic photothermal bundling power generation systems. The output forecast of the operator, with the minimum standard deviation of the output, optimizes the output configuration of the two. The optimization process does not consider the power price factor, and does not optimize the maximum revenue of the power station. It is different from the complementary and coordinated power generation system and operation method described in this patent.

[0008] Chinese patent CN202872690U proposes a device that uses light-transmitting photovoltaic cells combined with photothermal power generation, and uses high-transmittance photovoltaic cells and concentrating equipment to realize photovoltaic photothermal comprehensive utilization. This system is also a component-level innovation. Photovoltaic thermal system is not mentioned, it is different from the complementary synergistic power generation system described in this patent

[0009] Chinese patent CN105007038A proposes a photovoltaic auxiliary power generation system of a photothermal power station, which realizes photovoltaic auxiliary photothermal power generation by installing photovoltaic panels above the Fresnel secondary reflection surface. In this system, photovoltaic and photothermal operate independently. Complementary and synergistic functions

[0010] Chinese patent CN106330093A proposes a photovoltaic photothermal integrated power generation system, which heats water through photovoltaic power generation, and then passes the water into the photothermal heat collection system to achieve hybrid power generation. In addition, the photovoltaic photothermal system operates independently. In this system It is not feasible to pour water into the photothermal heat collection system above 1000 °C in engineering. A large amount of water with uneven temperature will cause uneven heating of the photothermal heat collection system and reduce the life of the equipment

In addition, when the photovoltaic and solar thermal power generation systems operate independently, they cannot coordinate and optimize their respective on-grid power according to the dispatching needs of the grid.

[0011] Chinese patent CN205051623U proposes a photovoltaic solar-thermal integrated power generation system, which installs photovoltaic modules and solar-thermal modules on a support at the same time to realize integrated power generation. In this system, photovoltaic solar-thermal energy still operates independently, and only heat collection As for the components on the same support, they still generate electricity independently, and do not have the function of coordinating and optimizing their respective on-grid power according to the grid dispatching requirements

[0012] To sum up, there are few researches on solar-thermal-photovoltaic complementary power generation at present, and they are still mainly in the theoretical stage. Complementary synergistic power generation systems and operating methods with high self-regulation capabilities that fully utilize the respective characteristics of photothermal photovoltaics, which have not been mentioned in the current patent achievements

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