CN212305206U - Photo-thermal photovoltaic complementary cooperative power generation system - Google Patents

Photo-thermal photovoltaic complementary cooperative power generation system Download PDF

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CN212305206U
CN212305206U CN202021636653.6U CN202021636653U CN212305206U CN 212305206 U CN212305206 U CN 212305206U CN 202021636653 U CN202021636653 U CN 202021636653U CN 212305206 U CN212305206 U CN 212305206U
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朱勇
曹曦
刘大为
徐若晨
刘明义
裴杰
曹传钊
郑建涛
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Huaneng Clean Energy Research Institute
Huaneng Group Technology Innovation Center Co Ltd
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Huaneng Group Technology Innovation Center Co Ltd
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

The utility model discloses a photo-thermal photovoltaic complementary cooperative power generation system, which comprises a photovoltaic power station, a photo-thermal power station, an electric heating system, a confluence system, a control system and a power grid, wherein 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; the output end of 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 with the 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, the control system is connected with the control end of the confluence system, the output end of the confluence system is connected with a power grid, the system can realize complementary cooperative power generation of photovoltaic and photo-thermal, and the self-regulation capacity is strong.

Description

Photo-thermal photovoltaic complementary cooperative power generation system
Technical Field
The utility model belongs to the technical field of solar energy power generation, a complementary power generation system in coordination of light and heat photovoltaic is related to.
Background
With the continuous improvement of the proportion of renewable energy installation and generating capacity in the total electric installation and generating capacity, about 150 countries around the world set specific targets for renewable energy power generation, mainly focusing on wind power generation and solar power generation. The method aims to achieve the aims that the non-fossil energy power generation installed proportion can reach 50% in the last stage of fourteen-five in China, the greenhouse gas emission (possibly) reaches a peak value, and then the emission is reduced year by year, so that the quality of wind power and solar energy electric energy is improved, and the wind power and solar energy power generation consumption proportion is improved.
The solar power generation mainly comprises two technical forms of photovoltaic and photo-thermal power generation, the photovoltaic power generation is weaker in self-adjusting capacity, a certain proportion of light abandoning rate is usually generated during consumption, a related supporting file of photovoltaic power distribution and energy storage is provided in partial areas at present, a pure photovoltaic power station can realize the low price or the low price on-line, but the existing pure photovoltaic energy storage mode is difficult to have economy due to the fact that the cost of a battery energy storage system is higher. The photo-thermal power station has strong adjusting capacity due to the arrangement of the heat storage system, and the adjusting range of the photo-thermal power station is approximately from 0% to 100%. If combine together photovoltaic and light and heat system, can utilize the regulating power of light and heat to stabilize photovoltaic electric energy fluctuation in the system, or realize the off-peak electricity generation, also can utilize low-cost photovoltaic power plant electric energy to reduce light and heat power plant generating cost economically, or (partial) replace light and heat power plant station power consumption. Through the complementary cooperation electricity generation with photovoltaic and light and heat system, can maximize performance both's regulating power, realize the profit maximize.
At present, many scholars and enterprises have studied photovoltaic photo-thermal complementary power generation, and the conditions of main related research results are as follows:
chinese patent CN203984349U proposes a fast-reforming photovoltaic and photo-thermal integrated distributed system, chinese patent CN107702194A proposes a photovoltaic and photo-thermal power generation and heating system and a control method, and chinese patent CN205754215U proposes a photovoltaic and photo-thermal integrated system. Above-mentioned three patents all realize photovoltaic light and heat through spotlight photovoltaic technology and generate electricity jointly, are that component level photovoltaic light and heat power generation technology combines, and the main technical route is still photovoltaic power generation, with this patent the photo-thermal turbine power generation system is different completely.
Chinese patent CN209692366U proposes a solar photovoltaic and photo-thermal complementary power generation system for power isolated network, which realizes the complementary power generation of photovoltaic photo-thermal power station by a complementary control system, in the system, the photovoltaic and photo-thermal independently operate except for the meteorological prediction system, which is different from the complementary cooperative power generation system described in this patent.
Chinese patent CN110429667A proposes a capacity allocation method for a photovoltaic-thermal photovoltaic bundling power generation system based on cuckoo search, which can realize minimum output standard deviation of the photovoltaic-thermal bundling power generation system, in the system, photovoltaic and thermal independently operate, based on output prediction of the photovoltaic and thermal, the output allocation of the photovoltaic and thermal bundling power generation system is optimized with the goal of minimum output standard deviation, the optimization process does not consider electricity price factors, and the maximum income of a power station is not optimized, which is different from the complementary cooperative power generation system and the operation method described in the present patent.
Chinese patent CN202872690U proposes a device for comprehensive utilization of photovoltaic cells combined with photo-thermal power generation, which utilizes high-transmittance photovoltaic cells and light-gathering equipment to realize comprehensive utilization of photovoltaic and photo-thermal power.
Chinese patent CN105007038A proposes a photovoltaic auxiliary power generation system for photo-thermal power station, which realizes photovoltaic auxiliary photo-thermal power generation by adding a photovoltaic cell panel above a fresnel secondary reflecting surface, wherein the photovoltaic and photo-thermal independently operate in the system, and the system structure has no complementary synergistic function.
Chinese patent CN106330093A proposes a photovoltaic and photo-thermal integrated power generation system, adds hot water through photovoltaic power generation, lets in water into photo-thermal collection system again, realizes hybrid power generation, and in addition photovoltaic photo-thermal system independent operation, in the photo-thermal collection system that this system was hit into water more than 1000 ℃, the feasibility is relatively poor in the engineering, and the unbalanced water of a large amount of temperatures can cause photo-thermal collection system to be heated unevenly, reduces equipment life. In addition, when the photovoltaic power generation system and the photo-thermal power generation system operate independently, the respective internet power cannot be optimized comprehensively according to the dispatching requirement of the power grid.
Chinese patent CN205051623U proposes a photovoltaic and photo-thermal integrated power generation system, which installs photovoltaic module and photo-thermal module on a support simultaneously, realizes integrated power generation, and photovoltaic and photo-thermal still operate independently in the aspect of energy in this system, and only thermal-arrest module is on same support, then actually still independent power generation, and does not possess the function of overall planning and optimizing the power of surfing the internet separately according to the power grid dispatching demand.
In summary, at present, research related to photo-thermal photovoltaic complementary power generation is less, and mainly still stays in a theoretical stage, related achievements cannot meet the requirement of power grid dispatching on system flexibility during solar power generation and absorption, and a complementary cooperative power generation system and an operation method which give full play to respective characteristics of photo-thermal photovoltaic and have high self-regulation capability need to be designed, which are not mentioned in the existing patent achievements.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a complementary power generation system in coordination of light and heat photovoltaic, this system can realize the complementary power generation in coordination of photovoltaic and light and heat, and self-interacting ability is stronger.
In order to achieve the above object, the photo-thermal and photovoltaic complementary cooperative power generation system of the present invention comprises a photovoltaic power station, a photo-thermal power station, an electric heating system, a converging system, a control system and a power grid, wherein the photovoltaic power station comprises a photovoltaic array and an inverter, and the photo-thermal power station comprises a photo-thermal heat collecting system, a heat storage system and a power generation system;
the output end of 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 with the 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, the control system is connected with the control end of the confluence system, and the output end of the confluence system is connected with the power grid.
The heat storage system comprises a high-temperature heat storage system and a low-temperature heat storage system, wherein an outlet of the high-temperature heat storage system is communicated with an inlet of the power generation system, an outlet of the power generation system is communicated with an inlet of the low-temperature heat storage system, an outlet of the low-temperature heat storage system is communicated with an inlet of the photo-thermal heat collection system, an outlet of the photo-thermal heat collection system is communicated with an inlet of the high-temperature heat storage system, a heater is arranged in the high-temperature heat storage system, and the electric heating.
The power generation system comprises a heat exchanger, a steam turbine and a generator, wherein the heat release side of the heat exchanger is communicated with the heat storage system, the heat absorption side inlet of the heat exchanger is communicated with the outlet of the steam turbine, the heat absorption side outlet of the heat exchanger is communicated with the inlet of the steam turbine, and the output shaft of the steam turbine is connected with the driving shaft of the generator.
Be provided with photovoltaic electric energy meter and light and heat electric energy meter on the system that converges, light and heat electric energy meter is connected with power generation system, and photovoltaic electric energy meter is connected with the dc-to-ac converter.
The utility model discloses following beneficial effect has:
complementary collaborative power generation system of light and heat photovoltaic when concrete operation, the power scheduling instruction of electric wire netting can be followed to the power station, photo-thermal power and photovoltaic power are optimized to the prediction condition that combines the present photo-thermal power generation power of power station and photovoltaic power generation power and future time quantum in photo-thermal power generation power and photovoltaic power generation power, make the whole power scheduling requirement of being incorporated into the power networks of power station, avoid because of the examination that generated power and dispatch deviation are great and cause, make the power station reach the profit maximize, in addition, the electric quantity that photovoltaic power station surpassed is saved in the heat-retaining system through electric heating system, make photo-thermal power station and photovoltaic power station can the degree of depth merge, save the energy storage system that photovoltaic power station drops into for steady operation, further improve the economic nature and the flexibility of whole power station, realize the complementary collaborative power generation of photovoltaic and light and.
Drawings
FIG. 1 is a schematic diagram of the present invention;
fig. 2 is a schematic structural diagram of the present invention.
The solar energy heat collection system comprises a solar heat collection system 1, a heat storage system 2, a power generation system 3, a confluence system 4, a photovoltaic array 5, an inverter 6, a control system 7, a power grid 8, an electric heating system 9, a high-temperature heat storage system 201, a low-temperature heat storage system 202, a heat exchanger 301, a steam turbine 302, a power generator 303, a solar heat electric energy meter 401 and a photovoltaic electric energy meter 402.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1 and 2, the photo-thermal and photovoltaic complementary cooperative power generation system of the present invention includes a photovoltaic power station, a photo-thermal power station, an electric heating system 9, a converging system 4, a control system 7 and a power grid 8, the photovoltaic power station includes a photovoltaic array 5 and an inverter 6, and the photo-thermal power station includes a photo-thermal heat collecting system 1, a heat storage system 2 and a power generation system 3; the output end of the photovoltaic array 5 is connected with a power interface of an electric heating system 9 and a confluence system 4 through an inverter 6, the photo-thermal heat collection system 1 is connected with the heat storage system 2, the heat storage system 2 is connected with the power generation system 3, the output end of the power generation system 3 is connected with the confluence system 4, the control system 7 is connected with the control end of the confluence system 4, and the output end of the confluence system 4 is connected with a power grid 8.
The heat storage system 2 comprises a high-temperature heat storage system 201 and a low-temperature heat storage system 202, wherein an outlet of the high-temperature heat storage system 201 is communicated with an inlet of the power generation system 3, an outlet of the power generation system 3 is communicated with an inlet of the low-temperature heat storage system 202, an outlet of the low-temperature heat storage system 202 is communicated with an inlet of the photo-thermal heat collection system 1, an outlet of the photo-thermal heat collection system 1 is communicated with an inlet of the high-temperature heat storage system 201, a heater is arranged in the high-temperature heat storage system 201, and the electric heating system.
The power generation system 3 comprises a heat exchanger 301, a steam turbine 302 and a generator 303, wherein the heat release side of the heat exchanger 301 is communicated with the heat storage system 2, the heat absorption side inlet of the heat exchanger 301 is communicated with the outlet of the steam turbine 302, the heat absorption side outlet of the heat exchanger 301 is communicated with the inlet of the steam turbine 302, and the output shaft of the steam turbine 302 is connected with the driving shaft of the generator 303.
The confluence system 4 is provided with a photovoltaic electric energy meter 402 and a photo-thermal electric energy meter 401, the photo-thermal electric energy meter 401 is connected with the power generation system 3, and the photovoltaic electric energy meter 402 is connected with the inverter 6.
The working mode of the utility model comprises a confluence grid-connected cooperative operation mode and a photo-thermal photovoltaic heat storage cooperative operation mode;
the specific operation process in the confluence grid-connected cooperative operation mode is as follows:
1a) the control system 7 obtains a power dispatching instruction, detects the photo-thermal power generation power of the current photo-thermal power station and the photovoltaic power generation power of the photovoltaic power station, simultaneously predicts the power generation power of the photo-thermal power station and the photovoltaic power generation power of the photovoltaic power station in a future preset time period, and ensures that the integral grid-connected power of the power station meets the requirement of the power dispatching instruction, namely the integral grid-connected power of the power stationThe relative deviation is smaller than the allowable deviation of the power grid 8PI.e. by
Figure BDA0002623574340000071
Wherein G isplantFor the power of the plant as a whole, GcspFor grid-connected power of photothermal power stations, GpvFor grid-connected power of photovoltaic plants, GgridIn order to be able to schedule the power command,Pthe relative deviation between the integral grid-connected power of the power station and the power dispatching instruction is obtained;
2b) based on the historical data of the generated power and the time-of-use electricity price, the time-of-use grid-connected power of the photo-thermal power station and the photovoltaic power station is optimized by using an optimization algorithm, so that the one-day overall income I of the power station is maximized.
Figure BDA0002623574340000072
Wherein n is the division of a day into n time segments, Gcsp·tAnd Gpv·tThe photothermal grid-connected power and the photovoltaic grid-connected power in the t-th time period in a day, Pcsp·tAnd Ppv·tThe solar heat electricity price and the photovoltaic electricity price in the t-th time period in the day respectively, A is whenPThe requirement of the power grid 8 on allowable deviation is not met, and the assessment cost of the power market is received;
the specific operation process of the photo-thermal photovoltaic heat storage coordination operation mode comprises the following steps:
when the generated power of the photovoltaic power station is higher than the optimized required photovoltaic grid-connected power, the residual electric energy is used for heating the energy storage medium in the heat storage system 2 by using the electric heating system 9, when the generated power of the photovoltaic power station is less than or equal to the optimized required photovoltaic grid-connected power, the electric heating system 9 is stopped, and the specific process is as follows:
heating power G of the electric heating system 9hAutomatically adjusted according to the photovoltaic grid-connected power and photovoltaic generated power conditions, i.e.
Figure BDA0002623574340000073
Wherein G ishFor electric heating power, GiThe electric power is output from the photovoltaic power station inverter 6;
in the process that the electric heating system 9 heats the heat storage medium in the heat storage system 2, the flow of the heat storage medium entering the heat storage system 2 is adjusted in real time, and the temperature of the heat storage medium output from the photo-thermal heat collection system 1 to the heat storage system 2 is adjusted at the same time, so that the temperature of the heat storage medium output from the photo-thermal heat collection system 1 to the heat storage system 2 and heated by the electric heating system 9 is the preset temperature, namely the temperature is the preset temperature
Figure BDA0002623574340000081
Wherein c is the specific heat of the heat storage medium,
Figure BDA0002623574340000082
flow rate of heat storage medium, T, output from the photothermal heat collecting system 1setTo a predetermined temperature, ToutThe temperature of the heat storage medium output by the photo-thermal heat collection system 1, and eta is the comprehensive efficiency of the electric heating system 9 and the heating process.
It is explicated at last, the utility model provides a calculation process all adopts hardware realization such as multiplier, subtracter, multiplier and comparator, the utility model discloses an innovation point lies in the integration.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.

Claims (4)

1. The photo-thermal photovoltaic complementary cooperative power generation system is characterized by comprising a photovoltaic power station, a photo-thermal power station, an electric heating system (9), a confluence system (4), a control system (7) and a power grid (8), wherein the photovoltaic power station comprises a photovoltaic array (5) and an inverter (6), and the photo-thermal power station comprises a photo-thermal heat collection system (1), a heat storage system (2) and a power generation system (3);
the output end of the photovoltaic array (5) is connected with a power interface of an electric heating system (9) and a confluence system (4) through an inverter (6), the photothermal heat collection system (1) is connected with the heat storage system (2), the heat storage system (2) is connected with the power generation system (3), the output end of the power generation system (3) is connected with the confluence system (4), the control system (7) is connected with the control end of the confluence system (4), and the output end of the confluence system (4) is connected with a power grid (8).
2. The photo-thermal photovoltaic complementary cooperative power generation system according to claim 1, wherein the heat storage system (2) comprises a high-temperature heat storage system (201) and a low-temperature heat storage system (202), an outlet of the high-temperature heat storage system (201) is communicated with an inlet of the power generation system (3), an outlet of the power generation system (3) is communicated with an inlet of the low-temperature heat storage system (202), an outlet of the low-temperature heat storage system (202) is communicated with an inlet of the photo-thermal heat collection system (1), an outlet of the photo-thermal heat collection system (1) is communicated with an inlet of the high-temperature heat storage system (201), a heater is arranged in the high-temperature heat storage system (201), and an electric heating system (9) is connected with the heater.
3. The photothermal and photovoltaic complementation synergy power generation system according to claim 1, wherein the power generation system (3) comprises a heat exchanger (301), a steam turbine (302) and a power generator (303), wherein the heat release side of the heat exchanger (301) is communicated with the heat storage system (2), the heat absorption side inlet of the heat exchanger (301) is communicated with the outlet of the steam turbine (302), the heat absorption side outlet of the heat exchanger (301) is communicated with the inlet of the steam turbine (302), and the output shaft of the steam turbine (302) is connected with the driving shaft of the power generator (303).
4. The photo-thermal photovoltaic complementary cooperative power generation system according to claim 1, wherein the confluence system (4) is provided with a photovoltaic electric energy meter (402) and a photo-thermal electric energy meter (401), the photo-thermal electric energy meter (401) is connected with the power generation system (3), and the photovoltaic electric energy meter (402) is connected with the inverter (6).
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