Renewable energy wind-solar complementary coupling power generation and hydrogen production system

Abstract

The utility model relates to a renewable energy wind-solar complementary coupling power generation and hydrogen production system, which can effectively realize the technical problem of coordination control of the whole system according to the supply and demand conditions of a power grid, and adopts the technical scheme that the output end of a wind power generation array is electrically connected with a direct-current bus through a rectifier, and the direct-current bus is electrically connected with the input end of an inverter; the output end of the inverter is electrically connected with the input end of the boosting transformer, the output end of the boosting transformer is electrically connected with the input end of the power grid, the output end of the photovoltaic power generation array is electrically connected with the input end of the direct current-direct current converter, the output end of the direct current-direct current converter is electrically connected with the direct current bus, and the output end of the energy storage system is electrically connected with the direct current bus through the bidirectional DC / DC converter. The water electrolysis hydrogen production system has the advantages that the power generation efficiency is greatly improved, the comprehensive utilization rate of energy is increased, and the water electrolysis hydrogen production system is an innovation of a renewable energy hydrogen production system.

Description

1. Technical Field

[0001] The utility model relates to the field of wind-solar complementary power generation, hydrogen production and energy storage, in particular to a renewable energy wind-solar complementary coupling power generation and hydrogen production system. 2. Background Technology

[0002] my country has a vast territory and has the terrain advantages of wind and solar power generation, but wind power generation and photovoltaic power generation are restricted by location, season, weather and time. Wind power generation has a larger output in autumn and winter and at night, and a smaller output in spring and summer and during the day, while photovoltaic power generation has a larger output in summer and autumn and during the day, and a smaller output in spring and winter, and almost no power output at night. If they can be combined, a stable power system will be formed, and the advantages of the two will complement each other. Since the output power of wind power generation system and photovoltaic power generation system is unstable, resulting in serious wind and light abandonment, how to effectively use this electricity is particularly important.

[0003] Against the backdrop of the dual carbon goals and energy crisis, the global photovoltaic market demand is continuing to grow rapidly. According to the International Renewable Energy Agency (IRENA), by 2050, photovoltaic power generation capacity will exceed 14,000GW; wind energy, as the fastest growing clean energy among renewable energy sources, is the renewable energy with the most promising prospects for large-scale development and commercial development, and is easy for people to use effectively. According to statistics from the Global Wind Energy Council (GWEC), by 2050, the annual new market will reach 208GW, and the cumulative market capacity will reach 5,806GW. The value of abandoned wind and photovoltaic power in the future will be very high. If it is utilized, it will bring huge economic and social benefits.

[0004] The rapid development of wind power generation and photovoltaic power generation has highlighted the difficulties in power transmission and comprehensive consumption. Because wind power generation and photovoltaic power generation have the characteristics of randomness and irregularity, the quality of electric energy is relatively poor, and some traditional energy storage technologies cannot meet the storage of renewable energy, so in most cases they are forced to abandon wind and light; it is difficult to store energy for wind and light power generation, and traditional energy storage technologies such as electrochemical energy storage, electromagnetic energy storage and physical operation costs are high, and cannot meet the requirements of large-scale energy storage and future pure green energy development. Hydrogen energy, which has the characteristics of cleanliness and high energy, is regarded as the most promising secondary energy in contemporary times. In modern society, hydrogen energy has great development potential in transportation, power generation, and petrochemical industries. Energy storage technology is the main part of the future development of renewable energy, and it is also the key technology to achieve the development of "smart energy". Therefore, it can be said that among the current energy storage technologies, hydrogen energy is the most suitable for green development, more suitable for popularization and breakthroughs in the field of technology. Therefore, it is imperative to invent a renewable energy wind and light complementary coupling power generation hydrogen production system. III. Summary of the invention

[0005] In view of the above situation, in order to solve the defects of the prior art, the purpose of the utility model is to provide a renewable energy wind-solar complementary coupling power generation and hydrogen production system, which can effectively achieve the technical problem of coordinated control of the entire system according to the supply and demand of the power grid.

[0006] The technical solution solved by the utility model is that it includes a photovoltaic power generation array, a wind power generation array, a water electrolysis hydrogen production system, an energy storage system and a power grid, the output end of the wind power generation array is electrically connected to a DC bus through a rectifier, the DC bus is electrically connected to an inverter input end, the inverter output end is electrically connected to a step-up transformer input end, the step-up transformer output end is electrically connected to a power grid input end, the photovoltaic power generation array output end is electrically connected to a DC-DC converter input end, the DC-DC converter output end is electrically connected to a DC bus, the energy storage system output end is electrically connected to a DC bus through a bidirectional DC / DC converter, and the DC bus is electrically connected to an input end of the water electrolysis hydrogen production system.

[0007] The utility model provides a wind-solar complementary power generation and hydrogen production system based on the complementary energy supply technology of wind power generation and photovoltaic power generation. The wind-solar complementary power generation is preferentially supplied to the power grid, and the excess electric energy is supplied to the water electrolysis hydrogen production system for hydrogen production and the energy storage system for charging. When the wind-solar complementary power generation is insufficient, the energy storage system supplies power to the system. The system greatly improves the power generation efficiency and increases the comprehensive utilization rate of energy. It is an innovation in the renewable energy hydrogen production system. IV. Description of the drawings

[0008] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0009] Figure 2 It is a simulation schematic diagram of the utility model. V. Specific implementation methods

[0010] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0011] Depend on Figure 1-2 It is given that the utility model includes a photovoltaic power generation array, a wind power generation array, a water electrolysis hydrogen production system, an energy storage system and a power grid. The output end of the wind power generation array is electrically connected to the DC bus via a rectifier, the DC bus is electrically connected to the input end of the inverter, the output end of the inverter is electrically connected to the input end of the step-up transformer, the output end of the step-up transformer is electrically connected to the input end of the power grid, the output end of the photovoltaic power generation array is electrically connected to the input end of the DC-DC converter, the output end of the DC-DC converter is electrically connected to the DC bus, the output end of the energy storage system is electrically connected to the DC bus via a bidirectional DC / DC converter, and the DC bus is electrically connected to the input end of the water electrolysis hydrogen production system.

[0012] In order to ensure the use effect, the water electrolysis hydrogen production system is composed of an aqueous solution electrolyzer and a hydrogen storage tank connected together.

[0013] The energy storage system is composed of a battery / supercapacitor and a bidirectional DC / DC converter. The positive electrode of the battery / supercapacitor is electrically connected to the inductor L of the bidirectional DC / DC converter. The inductor L is electrically connected to the T1 diode and the T2 diode respectively. The T1 diode and the T2 diode are respectively connected in parallel with the capacitor C and the resistor R and are electrically connected to the positive electrode of the DC bus. The negative electrode of the battery / supercapacitor is electrically connected to the negative electrode of the DC bus via the T1 diode, the T2 diode, the capacitor C, and the negative electrode of the resistor R.

[0014] The positive pole of the photovoltaic power generation array is electrically connected to the energy storage system diode and the positive pole of the DC bus respectively, and the negative pole of the photovoltaic power generation array is electrically connected to the RLC series branch 1 pin of the energy storage system and the negative pole of the DC bus respectively.

[0015] A voltmeter is provided between the positive and negative poles of the DC bus, the voltmeter is electrically connected to the oscilloscope, and a wire between the voltmeter and the oscilloscope is electrically connected to a pin V-dc of the energy storage system.

[0016] The positive and negative electrodes of the wind power generation array are electrically connected to the positive and negative electrodes of the DC bus respectively; the positive and negative electrodes of the water electrolysis hydrogen production system are electrically connected to the positive and negative electrodes of the DC bus respectively.

[0017] The power grid is composed of an IGBT (insulated gate bipolar transistor), a three-phase power parameter tester, a three-phase series RLC branch, and a three-phase series RLC load. The positive and negative poles of the DC bus are electrically connected to the positive and negative poles of the IGBT, respectively. The g pin of the IGBT is electrically connected to the pulse generator. The A, B, and C pins of the IGBT are electrically connected to the A, B, and C pins of the three-phase power parameter tester. The a, b, and c pins of the three-phase power parameter tester are electrically connected to the A, B, and C pins of the three-phase series RLC branch. The a, b, and c pins of the three-phase series RLC branch are electrically connected to the A, B, and C pins of the three-phase series RLC load.

[0018] The wind power generation array is a wind power generator, and the photovoltaic power generation array is a photovoltaic generator.

[0019] The photovoltaic cell array is composed of photovoltaic cell monomers in series and packaged in parallel (which is a well-known prior art).

[0020] The use of the utility model is that the output ends of the photovoltaic power generation array and the wind power generation array are connected to the DC bus, the output end of the energy storage system is connected to the DC bus, the input end of the water electrolysis hydrogen production system is the DC bus, and the input end of the power grid is the DC bus. The water electrolysis hydrogen production system includes a water electrolysis hydrogen production machine and a hydrogen storage tank. The energy storage system includes a super capacitor and a battery, and is coordinated and controlled through a DC / DC converter according to the supply and demand conditions of the power grid. The electric energy generated by the photovoltaic power generation array and the wind power generation array is converted into AC power through the DC bus through the AC / DC conversion module, and then supplied to the power grid through a step-up transformer. The photovoltaic power generation array and the wind power generation array give priority to supplying the generated electric energy to the power grid for use, and the excess electric energy is supplied to the water electrolysis system. The water solution electrolyzer of the hydrogen system, the electricity generated by the photovoltaic array and the wind power array are put on the DC bus, and the electricity on the DC bus is used to electrolyze water to produce hydrogen (the electrolyzer produces hydrogen by electrolyzing water), and the produced hydrogen is stored in the hydrogen storage tank. When the wind power and photovoltaic output are higher than the load (grid) power demand, the energy storage system absorbs the excess power through the battery or supercapacitor through the bidirectional DC / DC converter. When the wind power and photovoltaic output are lower than the load (grid) power demand, the battery or supercapacitor makes up for the system's insufficient power (electricity) to smooth the power. In the Boost state of the bidirectional DC / DC converter, the T1 tube is turned off and the T2 tube is working. The discharge of the energy storage element is achieved by modulating the duty cycle D of the T2 tube. In the Buck state, the T1 tube is working and the T2 tube is off. It is only necessary to control the duty cycle D' of the T1 tube to charge the energy storage element.

[0021] The utility model produces the required hydrogen by wind-solar complementary power generation and water electrolysis. The photovoltaic power generation array and the wind power generation array generate electricity complementary to each other, and power is supplied to the power grid preferentially through a DC / AC inverter and then a step-up transformer. The excess electric energy is used to power the energy storage system for energy storage or flows to the water electrolysis hydrogen production system to electrolyze water to produce hydrogen. The produced hydrogen flows to the hydrogen tank for storage. When the wind-solar complementary power generation is insufficient, the energy storage system supplies power to the system. The energy storage system is optimized by using a bidirectional DC / DC converter, and hydrogen is produced by using excess electric energy, thereby improving the energy utilization rate and truly realizing energy conversion by using the abandoned wind and abandoned light electricity. It is an innovation in the renewable energy hydrogen production system and has good economic and social benefits.

[0022] It should be pointed out that the above is only a preferred embodiment of the utility model, and does not impose any form of limitation on the utility model. Any technician familiar with the profession can use the technical content disclosed above to make changes or modify it into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the utility model, which all fall within the protection scope of the utility model.

Claims

1. A renewable energy wind-solar complementary coupling power generation hydrogen production system, characterized in that: It includes a photovoltaic power generation array, a wind power generation array, a water electrolysis hydrogen production system, an energy storage system and a power grid. The output end of the wind power generation array is electrically connected to the DC bus through a rectifier, the DC bus is electrically connected to the input end of the inverter, the output end of the inverter is electrically connected to the input end of the step-up transformer, the output end of the step-up transformer is electrically connected to the input end of the power grid, the output end of the photovoltaic power generation array is electrically connected to the input end of the DC-DC converter, the output end of the DC-DC converter is electrically connected to the DC bus, the output end of the energy storage system is electrically connected to the DC bus through a bidirectional DC / DC converter, and the DC bus is electrically connected to the input end of the water electrolysis hydrogen production system.

2. The renewable energy wind-solar complementary coupling power generation hydrogen production system according to claim 1 is characterized in that: The water electrolysis hydrogen production system is composed of an aqueous solution electrolyzer and a hydrogen storage tank connected together.

3. The renewable energy wind-solar complementary coupling power generation and hydrogen production system according to claim 1 is characterized in that: The energy storage system is composed of a battery / supercapacitor and a bidirectional DC / DC converter. The positive electrode of the battery / supercapacitor is electrically connected to the inductor L of the bidirectional DC / DC converter. The inductor L is electrically connected to the T1 diode and the T2 diode respectively. The T1 diode and the T2 diode are respectively connected in parallel with the capacitor C and the resistor R and are electrically connected to the positive electrode of the DC bus. The negative electrode of the battery / supercapacitor is electrically connected to the negative electrode of the DC bus via the T1 diode, the T2 diode, the capacitor C, and the negative electrode of the resistor R.

4. The renewable energy wind-solar complementary coupling power generation and hydrogen production system according to claim 1 is characterized in that: The positive pole of the photovoltaic power generation array is electrically connected to the energy storage system diode and the positive pole of the DC bus respectively, and the negative pole of the photovoltaic power generation array is electrically connected to the RLC series branch 1 pin of the energy storage system and the negative pole of the DC bus respectively.

5. The renewable energy wind-solar complementary coupling power generation and hydrogen production system according to claim 1 is characterized in that: A voltmeter is provided between the positive and negative poles of the DC bus, the voltmeter is electrically connected to the oscilloscope, and a wire between the voltmeter and the oscilloscope is electrically connected to a pin V-dc of the energy storage system.

6. The renewable energy wind-solar complementary coupling power generation hydrogen production system according to claim 1 is characterized in that: The positive and negative electrodes of the wind power generation array are electrically connected to the positive and negative electrodes of the DC bus respectively; the positive and negative electrodes of the water electrolysis hydrogen production system are electrically connected to the positive and negative electrodes of the DC bus respectively.

7. The renewable energy wind-solar complementary coupling power generation hydrogen production system according to claim 1 is characterized in that: The power grid is composed of an IGBT, a three-phase power parameter tester, a three-phase series RLC branch, and a three-phase series RLC load. The positive and negative poles of the DC bus are electrically connected to the positive and negative poles of the IGBT respectively, the g pin of the IGBT is electrically connected to the pulse generator, the A, B, and C pins of the IGBT are electrically connected to the A, B, and C pins of the three-phase power parameter tester, the a, b, and c pins of the three-phase power parameter tester are electrically connected to the A, B, and C pins of the three-phase series RLC branch, and the a, b, and c pins of the three-phase series RLC branch are electrically connected to the A, B, and C pins of the three-phase series RLC load.

8. The renewable energy wind-solar complementary coupling power generation and hydrogen production system according to claim 1 is characterized in that: The wind power generation array is a wind power generator, and the photovoltaic power generation array is a photovoltaic generator.

9. The renewable energy wind-solar complementary coupling power generation and hydrogen production system according to claim 1 is characterized in that: The photovoltaic power generation array is composed of photovoltaic battery monomers that are packaged in series and in parallel.

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