Multi-energy complementary energy system

Abstract

The utility model relates to a multi-energy complementary energy system, which comprises a multi-energy power generation part, a multi-energy complementary converter, an energy storage system and a power grid, the multi-energy power generation part comprises a wind driven generator, a photovoltaic array and a hydroelectric generator; the multi-energy complementary converter comprises two AC / DC rectifiers, a photovoltaic MPPT controller, a bidirectional DC / AC inverter and a DC bus, the two AC / DC rectifiers are electrically connected with the wind driven generator and the hydroelectric generator respectively, the photovoltaic MPPT controller is electrically connected with the photovoltaic array, the energy storage system comprises a bidirectional DC / DC module and a super capacitor, and the super capacitor is connected with the DC bus through the bidirectional DC / DC module; the power grid is connected with the direct current bus through the bidirectional DC / AC inverter; when the system is used for supplying power to the electric equipment, energy conservation and emission reduction can be realized, meanwhile, the power operation cost is greatly reduced, and great economic benefits are brought.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric energy, specifically relates to a multi-energy complementary energy system. BACKGROUND

[0002] Wind power and photovoltaic power generation have strong time and space volatility, how to guarantee power supply stability is a problem widely studied by domestic and foreign scholars. Hydropower is controllable and can effectively suppress wind power generation and photovoltaic power generation, so combining multiple clean energy sources for complementary power generation becomes a better choice. Wind, light, water, these three kinds of energy have natural complementarity in time and space distribution, plus energy storage system, can achieve peak clipping, reduce fluctuation, and make the wind-light-water complementary system more stable. Therefore, the comprehensive utilization of the three kinds of energy to replace part of the thermal power for power load can reduce a large amount of carbon emission and also reduce the power cost.

[0003] There is an urgent need to design an energy system using these three kinds of energy. UTILITY MODEL CONTENT

[0004] Based on the above description, the utility model provides a multi-energy complementary energy system to solve the technical problem that the combustion of traditional fossil energy for power generation causes serious environmental pollution.

[0005] The technical scheme for solving the above technical problem is as follows:

[0006] A multi-energy complementary energy system comprises a multi-energy power generation part, a multi-energy complementary converter, an energy storage system and a power grid.

[0007] The multi-energy power generation part comprises a wind turbine, a photovoltaic array and a water turbine.

[0008] The multi-energy complementary converter comprises two AC / DC rectifiers, a photovoltaic MPPT controller, a bidirectional DC / AC inverter and a DC bus, the two AC / DC rectifiers are electrically connected with the wind turbine and the water turbine respectively, the AC / DC rectifier module is used for converting the alternating current generated by the corresponding wind turbine and the corresponding water turbine into high-voltage direct current and then delivering the high-voltage direct current to the DC bus, the photovoltaic MPPT controller is electrically connected with the photovoltaic array and is used for converting the direct current generated by the photovoltaic array into high-voltage direct current and then delivering the high-voltage direct current to the DC bus.

[0009] The energy storage system comprises a bidirectional DC / DC module and a super capacitor, the super capacitor is connected with the DC bus through the bidirectional DC / DC module.

[0010] The power grid is connected with the DC bus through the bidirectional DC / AC inverter.

[0011] Compared with the prior art, the technical scheme of the application has the following beneficial technical effects:

[0012] The multi-energy complementary energy system provided by the application, during normal operation of the power grid, if the on-site environment has sufficient natural resources such as wind energy and solar energy, the photovoltaic array and the wind turbine generator continuously supply power, the excess energy is transmitted to the super capacitor to charge, energy storage is realized, when the distributed new energy cannot output sufficient power due to insufficient resources or operation failure, the energy storage device is controlled to discharge.

[0013] On the basis of the above technical scheme, the utility model still can make following improvement.

[0014] Further, the water pump is connected with the DC bus through the bidirectional DC / AC inverter.

[0015] Further, the bidirectional DC / DC module is an isolated full-bridge DC / DC converter.

[0016] Further, the bidirectional DC / DC module includes a source side, a transformer and a secondary side, and the source side and the secondary side transfer electric energy through the transformer.

[0017] Further, the energy on the DC bus is charged to the super capacitor through the bidirectional DC / DC module to realize energy storage, and the energy stored in the super capacitor is provided to the DC bus through the bidirectional DC / DC module to realize discharge. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The structure block diagram of the multi-energy complementary energy system in the embodiment of the application is shown in the figure.

[0019] Figure 2 The circuit principle diagram of the bidirectional DC / DC module in the embodiment of the application is shown in the figure. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the application, the application will be described more fully below with reference to the related drawings. The embodiments of the application are shown in the drawings. However, the application can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the application more thorough and comprehensive.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0022] It is understood that spatial relation terms such as "below," "under," "below," "below," "above," "over," etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as "below" or "under" or "below" of other elements or features will be oriented "over" of other elements or features. Therefore, the exemplary terms "below" and "under" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0023] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0024] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0025] like Figure 1 and 2 As shown in the figure, this application provides a multi-energy complementary energy system, which includes a multi-energy power generation section 10, a multi-energy complementary converter 20, an energy storage system 30, and a power grid 40.

[0026] The multi-energy power generation section 10 includes a wind turbine 11, a photovoltaic array 12, and a hydroelectric generator 13.

[0027] The multi-energy complementary converter 20 includes two AC / DC rectifiers, a photovoltaic MPPT controller 23, a bidirectional DC / AC inverter 24, and a DC bus 25.

[0028] The AC / DC rectifiers are commercially available AC / DC rectifiers for high-voltage power transmission, and the two AC / DC rectifiers are a first AC / DC rectifier 21 and a second AC / DC rectifier 22, the first AC / DC rectifier 21 is electrically connected with the wind turbine 11, and is used to convert the alternating current generated by the wind turbine 11 into high-voltage direct current and then transmit the high-voltage direct current to the direct current bus 25, and the second AC / DC rectifier 22 is electrically connected with the hydroelectric generator 13, and is used to convert the alternating current generated by the hydroelectric generator 13 into high-voltage direct current and then transmit the high-voltage direct current to the direct current bus 25.

[0029] The photovoltaic MPPT controller 23 is electrically connected with the photovoltaic array 12, and is used to convert the direct current generated by the photovoltaic array 12 into high-voltage direct current and then transmit the high-voltage direct current to the direct current bus 25; the photovoltaic MPPT controller is a maximum power tracking algorithm controller, which is a commonly used power controller in the current photovoltaic power generation system and is also a commercially available product, and thus will not be described here.

[0030] The energy storage system 30 includes a bidirectional DC / DC module 31 and a super capacitor 32, and the super capacitor 32 is connected with the direct current bus 25 through the bidirectional DC / DC module 31.

[0031] The power grid 40 is connected with the direct current bus 25 through the bidirectional DC / AC inverter 24, and the power grid 40 is accessed by the household power network.

[0032] The bidirectional DC / AC inverter 24 can invert the direct current on the direct current bus 25 into alternating current to supply power to the local power consumption equipment, and can also grid-connected power generation, that is, can realize the functions of inverting grid-connected and inverting off-grid. Meanwhile, the bidirectional DC / AC inverter 24 can also rectify the alternating current of the power grid 40 into direct current and send the direct current to the direct current bus 25 to charge the super capacitor of the energy storage system, that is, realize the rectification function, and this mode is used when it is necessary to cut the peak and fill the valley of the power grid, and also belongs to one of the working modes in the grid-connected mode. In the grid-connected mode, the direct current on the direct current bus is converted into alternating current with the same frequency and phase as the power grid, and the main function is to realize grid-connected power generation, island effect protection, reactive power compensation and the like.

[0033] Among them, the energy on the direct current bus 25 is charged to the super capacitor 32 through the bidirectional DC / DC module 31 to realize energy storage; the energy stored in the super capacitor 32 is provided to the direct current bus 25 through the bidirectional DC / DC module 31 to realize discharging.

[0034] The multi-energy complementary system provided in the application, during normal operation of the power grid, if the on-site environment has sufficient natural resources such as wind energy and solar energy, the photovoltaic array and the wind turbine generator continuously supply power, the excess energy is transmitted to the super capacitor to charge, energy storage is realized, when the distributed new energy cannot output sufficient power due to insufficient resources and operation failure, the energy storage device is controlled to discharge. When the super capacitor energy is discharged to the lower limit of discharge, the water turbine generator set is started to continue to supply power to the terminal load, at this time, when the water turbine generator set fails or the water storage is insufficient, the power grid continues to supply power to the terminal load, realizing the uninterrupted power supply target of the power utilization equipment. Using the system to supply power to the power utilization equipment can realize energy saving and emission reduction, and greatly reduce the power operation cost, bringing great economic benefits.

[0035] Preferably, the system further comprises a water pump 50 connected with the DC bus 25 through the bidirectional DC / AC inverter 24.

[0036] When the electric energy is sufficient, in addition to the use of the power grid and the power utilization equipment, if there is sufficient excess energy, the water pump can be started to store water for subsequent hydroelectric power generation, if the water storage is full at this time, the excess renewable energy is connected to the grid to generate electricity, further reducing energy consumption.

[0037] In the application, the bidirectional DC / DC module 31 is an isolated full-bridge DC / DC converter.

[0038] The bidirectional DC / DC module 31 comprises a source side 311, a transformer Tr and a secondary side 312, the source side 311 and the secondary side 312 transmit electric energy through the transformer Tr.

[0039] Specifically, the source side 311 comprises a No. 1 MOS tube Q1, a No. 2 MOS tube Q2, a No. 3 MOS tube Q3, a No. 4 MOS tube Q4, a first inductor Lrp and a first capacitor Crp, the No. 1 MOS tube Q1 and the No. 2 MOS tube Q2 are connected in series between the positive and negative poles of the DC bus, the No. 3 MOS tube Q3 and the No. 4 MOS tube Q4 are connected in series between the positive and negative poles of the DC bus, the circuit formed by the No. 3 MOS tube Q3 and the No. 4 MOS tube Q4 is connected in parallel with the circuit formed by the No. 1 MOS tube Q1 and the No. 2 MOS tube Q2, the first inductor Lrp and the first capacitor Crp are connected to the source side of the transformer Tr, constituting the energy storage capacitor and the energy storage inductor of the source side 311.

[0040] The secondary side 312 comprises a No. 5 MOS tube Q6, a No. 6 MOS tube Q6, a No. 7 MOS tube Q7, a No. 8 MOS tube Q8, a second inductor Lrs and a second capacitor Crs, the No. 5 MOS tube Q6 and the No. 6 MOS tube Q6 are connected in series between the positive electrode and the negative electrode of the super capacitor, the No. 7 MOS tube Q7 and the No. 8 MOS tube Q8 are connected in series between the positive electrode and the negative electrode of the super capacitor, the circuit composed of the No. 5 MOS tube Q6 and the No. 6 MOS tube Q6 is connected in parallel with the circuit composed of the No. 7 MOS tube Q7 and the No. 8 MOS tube Q8, the second inductor Lrs and the second capacitor Crs are connected on the secondary side of the transformer Tr, and the energy storage capacitor and the energy storage inductor of the secondary side 312 are formed.

[0041] In order to ensure the stability of the input and output voltage, the control circuits of the two parallel circuits need to share a voltage loop, and the output of the voltage loop generates two currents through a circuit distributor.

[0042] The multi-energy complementary energy system formed by the combination of wind, light, water and energy storage is widely applied, and the use of the multi-energy complementary energy system for power supply of the power equipment can realize energy saving and emission reduction, greatly reduce the power operation cost and bring great economic benefits. The multi-energy complementation is a derivative of renewable energy development, and the multi-energy complementation and integration are realized from the energy supply side, the user demand side and the energy transmission and distribution side, so that the coordinated development of energy, economy and environment is realized.

[0043] The above only describes the preferred embodiments of the utility model and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A multi-energy complementary energy system, characterized in that, The multi-energy power generation part, the multi-energy complementary converter, the energy storage system and the power grid are connected in series. The multi-energy power generation part comprises a wind power generator, a photovoltaic array and a hydraulic generator. The multi-energy complementary converter comprises two AC / DC rectifiers, a photovoltaic MPPT controller, a bidirectional DC / AC inverter and a DC bus, the two AC / DC rectifiers are respectively connected with the wind power generator and the hydraulic generator, the AC / DC rectifier module is used for converting the alternating current generated by the corresponding wind power generator and the corresponding hydraulic generator into high-voltage direct current and then transmitting the high-voltage direct current to the DC bus, the photovoltaic MPPT controller is connected with the photovoltaic array and is used for converting the direct current generated by the photovoltaic array into high-voltage direct current and then transmitting the high-voltage direct current to the DC bus. The energy storage system comprises a bidirectional DC / DC module and a super capacitor, the super capacitor is connected with the DC bus through the bidirectional DC / DC module. The power grid is connected with the DC bus through the bidirectional DC / AC inverter.

2. The multi-energy complementary power system of claim 1, wherein, A water pump is further included, the water pump is connected with the DC bus through the bidirectional DC / AC inverter.

3. The multi-energy complementary power system of claim 1, wherein, The bidirectional DC / DC module is an isolated full-bridge DC / DC converter.

4. The multi-energy complementary power system of claim 3, wherein, The bidirectional DC / DC module comprises a source side, a transformer and a secondary side, the source side and the secondary side transmit electric energy through the transformer.

5. The multi-energy complementary power system of claim 3, wherein, The energy on the DC bus is charged to the super capacitor through the bidirectional DC / DC module, so as to realize energy storage; the energy stored in the super capacitor is provided to the DC bus through the bidirectional DC / DC module, so as to realize discharging.

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