Light-storage-electricity integrated energy management system

Abstract

The utility model discloses a light-storage-electricity integrated energy management system, which comprises an inversion module, an energy storage module, a control module, a first switch, a second switch, a third switch and a fourth switch, the first switch is connected between the photovoltaic equipment and the inversion module so as to start or stop voltage conversion; the second switch is connected between the inversion module and the energy storage module so as to start or stop charging or discharging the energy storage module; the third switch is connected between the inversion module and the AC bus to open or close power supply to the AC bus; the fourth switch is connected between the third switch and the municipal power grid to open or close access of the municipal power grid; the control module can also be connected with the first switch, the second switch, the third switch and the fourth switch. According to the utility model, energy flow among the photovoltaic device, the energy storage module, the municipal power grid and the load can be coordinated, an effective power supply micro-grid is formed, stable operation of the system is ensured, and the demand of the load is satisfied.

Description

Technical Field

[0001] The utility model relates to the field of energy storage, in particular to a photovoltaic and electricity storage integrated energy management system. Background Art

[0002] Photovoltaic, energy storage, direct current and flexible power distribution refers to the application of photovoltaic, energy storage, direct current power distribution and flexible interaction in the field of buildings. It is a new type of power system constructed to improve the local absorption rate of photovoltaic power after a high proportion of buildings are connected to photovoltaic power. It is an important technical method for zero-carbon energy in buildings. This technology uses photovoltaic modules laid on the surface of buildings, takes buildings as photovoltaic installation scenes and energy producers, uses electrochemical energy storage, cold and heat storage, and electric vehicles parked around to achieve energy storage and regulation, and realizes efficient interconnection of photovoltaic direct current, energy storage direct current and building electrical appliances mainly based on direct current through direct current conversion. Finally, the adjustable characteristics of building loads are used to achieve flexible interaction with photovoltaic power and power grid.

[0003] Due to the complexity of the PV-storage-direct-flexible system and the high demand for safety and reliability in building scenarios, the design and implementation of the existing PV-storage-direct-flexible system requires multi-disciplinary collaboration, which is difficult and requires a high level of professionalism from the designer. The existing PV-storage-direct-flexible system is mainly powered by DC, while the common building electrical appliances in my country are still powered by AC, which is not applicable in the DC system; the existing PV-storage-direct-flexible system is cross-used with the conventional building electrical system, with unclear boundaries, mutual interference, unsafety, and instability, and it has not formed an effective power supply microgrid. Summary of the invention

[0004] The main purpose of the utility model is to overcome the defects of the existing photovoltaic storage direct-flexible system, and propose an integrated photovoltaic storage and electricity energy management system, which is combined with the municipal power grid and introduces AC power supply to form an effective power supply microgrid.

[0005] The utility model adopts the following technical solutions:

[0006] A photovoltaic and electricity storage integrated energy management system is connected to a municipal power grid and a photovoltaic device, and includes an inverter module, an energy storage module and a control module; the control module is connected to the inverter module and the energy storage module, and also includes a first switch, a second switch, a third switch and a fourth switch; the first switch is connected between the photovoltaic device and the inverter module to turn on or off voltage conversion; the second switch is connected between the inverter module and the energy storage module to turn on or off charging or discharging of the energy storage module; the third switch is connected between the inverter module and the AC bus to turn on or off power supply to the AC bus; the fourth switch is connected between the third switch and the municipal power grid to turn on or off access to the municipal power grid; the control module can also be connected to the first switch, the second switch, the third switch and the fourth switch.

[0007] The control module controls the first switch and the second switch to close, and controls the third switch and the fourth switch to open so that the photovoltaic device can charge the energy storage module; or the control module controls the second switch, the third switch, and the fourth switch to close, and controls the first switch to open so that the municipal power grid can charge the energy storage module.

[0008] The control module controls the first switch and the third switch to be closed, and controls the second switch and the fourth switch to be disconnected to realize the photovoltaic device supplying power to the AC bus; or the control module controls the fourth switch to be closed, and controls the first switch, the second switch, and the third switch to be disconnected to realize the municipal power grid supplying power to the AC bus; or the control module controls the second switch and the third switch to be closed, and controls the first switch and the fourth switch to be disconnected to realize the energy storage module supplying power to the AC bus.

[0009] The control module controls the first switch, the third switch and the fourth switch to close and controls the second switch to open to realize the photovoltaic device to supply power to the AC bus and the municipal power grid or to realize the photovoltaic device and the municipal power grid to supply power to the AC bus; or the control module controls the second switch, the third switch and the fourth switch to close and controls the first switch to open to realize the energy storage module to supply power to the AC bus and the municipal power grid.

[0010] The control module controls the first switch, the second switch and the third switch to close and controls the fourth switch to open so that the photovoltaic device can supply power to the energy storage module and the AC bus; or the control module controls the first switch, the second switch, the third switch and the fourth switch to close so that the photovoltaic device can supply power to the energy storage module, the municipal power grid and the AC bus.

[0011] The first switch is an intelligent switch, a photoresistor, a photodiode, a transistor switch, an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor, an electromagnetic switch or a magnetic contact switch.

[0012] The second switch is an intelligent switch, a transistor switch, an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor, an electromagnetic switch or a magnetic contact switch.

[0013] The third switch is an intelligent switch, a transistor switch, an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor, an electromagnetic switch or a magnetic contact switch.

[0014] The fourth switch is an intelligent switch, a transistor switch, an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor, an electromagnetic switch or a magnetic contact switch.

[0015] The energy storage module includes a battery cell, a charge and discharge circuit and a battery management unit. The battery cell includes a lithium-ion battery or a lead-acid battery. The charge and discharge circuit is connected to the battery cell for charging or discharging. The battery management unit is connected to the charge and discharge circuit and the battery.

[0016] It can be seen from the above description of the utility model that compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The system of the utility model includes an inverter module, an energy storage module, a control module, a first switch, a second switch, a third switch and a fourth switch, etc.; by controlling the states of the first switch, the second switch, the third switch and the fourth switch, the energy flow between the photovoltaic equipment, the energy storage module, the municipal power grid and the load is coordinated to form an effective power supply microgrid, ensure the stable operation of the system and meet the needs of the load.

[0018] 2. The system of the utility model highly integrates the control module, the inverter module and the energy storage module in the architecture, providing a physical basis for the energy centralization and intelligent control of the entire photovoltaic storage system.

[0019] 3. The system of the utility model controls the states of the first switch, the second switch, the third switch and the fourth switch through the control module to realize charging of the energy storage module by the photovoltaic device or the municipal power grid, power supply of the photovoltaic device or the municipal power grid or the energy storage module to the AC bus, power supply of the photovoltaic device to the AC bus and the municipal power grid or power supply of the photovoltaic device and the municipal power grid to the AC bus, power supply of the energy storage module to the AC bus and the municipal power grid, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the structural diagram of the utility model;

[0021] Figure 2 This is the circuit diagram of the inverter module;

[0022] Figure 3 This is a system composition diagram of the utility model. DETAILED DESCRIPTION

[0023] The present invention is further described below through specific implementation methods.

[0024] The terms "first" and "second" appearing in the present invention are only for the convenience of description to distinguish different components with the same name, and do not indicate a sequence or primary and secondary relationship.

[0025] In the description of the present invention, the directions or positional relationships indicated by “up”, “down”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention.

[0026] In addition, in the description of this application, unless otherwise specified, "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0027] See also Figure 1 and Figure 3 , a photovoltaic power storage integrated energy management system is connected to a municipal power grid and a photovoltaic device 10, and includes an inverter module 20, an energy storage module 30, a control module 40, a first switch K1, a second switch K2, a third switch K3, and a fourth switch K4. The first switch K1 is connected between the photovoltaic device 10 and the inverter module 20 to turn on or off the conversion of the DC voltage, and the first switch K1 is used to turn on or off the passage between the photovoltaic device 10 and the inverter module 20. The second switch K2 is connected between the inverter module 20 and the energy storage module 30 to turn on or off the charging or discharging of the energy storage module 30, that is, the second switch K2 is used to turn on or off the passage between the energy storage module 30 and the inverter module 20. The third switch K3 is connected between the inverter module 20 and the AC bus to turn on or off the power supply to the AC bus, and the third switch K3 is used to turn on or off the passage between the inverter module 20 and the AC bus, and the AC bus is used to connect the load. The fourth switch K 4 is connected between the third switch K 3 and the municipal grid to open or close the access to the municipal grid. The fourth switch K 4 is used to open or close the passage between the municipal grid and the AC bus or the inverter module 20 .

[0028] The photovoltaic device 10 uses a solar photovoltaic panel, etc. The inverter module 20 includes an inverter circuit and a rectifier circuit. The inverter circuit uses a high-frequency switching power supply technology to convert a DC voltage into an AC voltage, and the rectifier circuit converts the AC voltage into a DC voltage. The inverter module 20 converts the DC power output by the photovoltaic device 10 and the energy storage module 30 into AC power, and outputs it to the AC bus or the municipal power grid, or converts the AC power output by the municipal power grid into DC power, and outputs it to the energy storage module 30.

[0029] Specifically, the rectifier circuit can be implemented using a common rectifier, and the inverter circuit can be found in Figure 2It adopts the Heric topology structure and introduces a freewheeling loop on the basis of the full-bridge circuit to achieve a better effect of eliminating common-mode current. It includes capacitor C1, capacitor C2, switch tube Q1, switch tube Q2, switch tube 3, switch tube Q4, switch tube Q5, switch tube Q6, inductor L1, inductor L2, etc.

[0030] In the utility model, the first switch K1 adopts an intelligent switch, a photoresistor, a photodiode, a transistor switch, an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor, an electromagnetic switch or a magnetic contact switch, etc. The second switch K2 adopts an intelligent switch, a transistor switch, an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor, an electromagnetic switch or a magnetic contact switch, etc. The third switch K3 adopts an intelligent switch, a transistor switch, an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor, an electromagnetic switch or a magnetic contact switch, etc. The fourth switch K4 adopts an intelligent switch, a transistor switch, an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor, an electromagnetic switch or a magnetic contact switch, etc.

[0031] Among them, magnetic contact switches control the connection state through magnetic attraction or repulsion. Transistor switches use the amplification and cutoff states of transistors to control the flow of current. Electromagnetic switches switch the connection state by controlling electromagnetic coils. Photodiodes control the connection state through light. Photoresistors change resistance through light, affecting the circuit state. Insulated gate bipolar transistors (IGBTs) are used to convert direct current (DC) input to alternating current (AC) output. Metal oxide semiconductor field effect transistors (MOSFETs) are used in high-frequency inverter circuits and are suitable for DC to AC conversion. In energy management systems, smart switches can be used for remote or automatic control to manage energy more efficiently.

[0032] In the utility model, the energy storage module 30 includes a battery unit, a charge and discharge circuit and a battery management unit. The battery unit includes a lithium-ion battery or a lead-acid battery. The charge and discharge circuit is connected to the battery unit for charging or discharging. The charge and discharge circuit is also connected to the second switch K2. The battery management unit is connected to the charge and discharge circuit and the battery unit. The battery management unit is implemented by a common BMS management unit, and the battery management unit is also connected to the control module 40.

[0033] The control module 40 is connected to the inverter module 20 and the energy storage module 30, and is used to coordinate the energy flow between the photovoltaic device 10, the energy storage module 30, the municipal power grid and the AC bus, etc., to ensure stable operation of the system while meeting the needs of the AC bus.

[0034] The control module 40 can also be connected to the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4, and is used to control the states of each switch to switch different working states. Specifically, it includes the following:

[0035] The control module 40 controls the first switch K1 and the second switch K2 to close, and controls the third switch K3 and the fourth switch K4 to open, so that the path between the photovoltaic device 10 and the inverter module 20 is connected, and the path between the energy storage module 30 and the inverter module 20 is also connected, so that the photovoltaic device 10 can charge the energy storage module 30.

[0036] The control module 40 controls the second switch K2, the third switch K3 and the fourth switch K4 to close and controls the first switch K1 to open, so that the path between the photovoltaic device 10 and the inverter module 20 is cut off, and the path between the inverter module 20 and the energy storage module 30 and the municipal power grid is connected, so that the municipal power grid can charge the energy storage module 30.

[0037] The control module 40 controls the first switch K1 and the third switch K3 to close, and controls the second switch K2 and the fourth switch K4 to open, so that the path between the photovoltaic device 10 and the inverter module 20 is connected, the path between the AC bus and the inverter module 20 is connected, and the path between the energy storage module 30 and the inverter module 20 and the path between the municipal power grid and the AC bus is cut off, thereby realizing the power supply of the photovoltaic device 10 to the AC bus.

[0038] The control module 40 controls the fourth switch K4 to close and controls the first switch K1, the second switch K2 and the third switch K3 to open, so that the passage between the municipal power grid and the AC bus is connected, and the passage between the inverter circuit and the photovoltaic device 10, the energy storage module 30 and the AC module is cut off, thereby realizing the power supply of the municipal power grid to the AC bus.

[0039] The control module 40 controls the second switch K2 and the third switch K3 to close and controls the first switch K1 and the fourth switch K4 to open, so that the path between the energy storage module 30 and the inverter module 20 is connected, the path between the inverter module 20 and the AC module is connected, and the path between the photovoltaic device 10 and the inverter module 20 is cut off, and the path between the municipal power grid and the AC bus is cut off, so that the energy storage module 30 can supply power to the AC bus.

[0040] The control module 40 controls the first switch K1, the third switch K3 and the fourth switch K4 to close and controls the second switch K2 to open, so that the path between the photovoltaic module and the inverter module 20 is connected, the path between the inverter module 20 and the AC bus is connected, and the path between the AC bus and the municipal power grid is also connected. Only the path between the energy storage module 30 and the inverter module 20 is disconnected. In this way, the photovoltaic device 10 can supply power to the AC bus and the municipal power grid, or the photovoltaic device 10 and the municipal power grid can supply power to the AC bus.

[0041] The control module 40 controls the second switch K2, the third switch K3 and the fourth switch K4 to close and controls the first switch K1 to open, so that the path between the photovoltaic module and the inverter module 20 is disconnected, and the path between the inverter module 20 and the energy storage module 30, and the AC bus and the AC bus is connected, so that the energy storage module 30 can supply power to the AC bus and the municipal power grid.

[0042] The control module 40 controls the first switch K1, the second switch K2 and the third switch K3 to close and controls the fourth switch K4 to open, so that the path between the inverter module 20 and the photovoltaic module, the energy storage module 30 and the AC bus is connected, while the path between the municipal power grid and the inverter module 20 and the AC bus is disconnected, thereby realizing the photovoltaic device 10 to supply power to the energy storage module 30 and the AC bus.

[0043] The control module 40 controls the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 to close, that is, the paths between the inverter module 20 and the photovoltaic module, the energy storage module 30, the AC bus and the municipal power grid module are connected, so that the photovoltaic equipment 10 can supply power to the energy storage module 30, the municipal power grid and the AC bus.

[0044] The control module 40 may include a sampling unit, a communication unit, a control unit, etc., which are used to collect data such as voltage, current, power, etc. of each part of the photovoltaic device 10, the energy storage module 30, the inverter module 20, the AC bus and the load. The control unit is also connected to the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4, etc., and is used to control the state of each switch according to parameters and instructions. The control module 40 can use the EM2130H01QI chip or other chips with similar functions to complete its main functions. The EM2130H01QI chip is an intelligent energy management chip with energy monitoring, intelligent control and energy optimization functions.

[0045] The above is only a specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any non-substantial changes to the utility model using this concept shall be deemed as an infringement of the protection scope of the utility model.

Claims

1. A photovoltaic power storage integrated energy management system, connected to a municipal power grid and photovoltaic equipment, comprising an inverter module, an energy storage module and a control module; the control module is connected to the inverter module and the energy storage module, Features: It also includes a first switch, a second switch, a third switch and a fourth switch; the first switch is connected between the photovoltaic device and the inverter module to turn on or off the voltage conversion; the second switch is connected between the inverter module and the energy storage module to turn on or off the charging or discharging of the energy storage module; the third switch is connected between the inverter module and the AC bus to turn on or off the power supply to the AC bus; the fourth switch is connected between the third switch and the municipal power grid to turn on or off the access to the municipal power grid; the control module can also be connected to the first switch, the second switch, the third switch and the fourth switch.

2. A photovoltaic and electricity storage integrated energy management system as claimed in claim 1, Features: The control module controls the first switch and the second switch to close, and controls the third switch and the fourth switch to open so that the photovoltaic device can charge the energy storage module; or the control module controls the second switch, the third switch, and the fourth switch to close, and controls the first switch to open so that the municipal power grid can charge the energy storage module.

3. The photovoltaic and electricity storage integrated energy management system according to claim 1, Features: The control module controls the first switch and the third switch to be closed, and controls the second switch and the fourth switch to be disconnected to realize the photovoltaic device supplying power to the AC bus; or the control module controls the fourth switch to be closed, and controls the first switch, the second switch, and the third switch to be disconnected to realize the municipal power grid supplying power to the AC bus; or the control module controls the second switch and the third switch to be closed, and controls the first switch and the fourth switch to be disconnected to realize the energy storage module supplying power to the AC bus.

4. The photovoltaic and electricity storage integrated energy management system according to claim 1, Features: The control module controls the first switch, the third switch and the fourth switch to close and controls the second switch to open to realize the photovoltaic device to supply power to the AC bus and the municipal power grid or to realize the photovoltaic device and the municipal power grid to supply power to the AC bus; or the control module controls the second switch, the third switch and the fourth switch to close and controls the first switch to open to realize the energy storage module to supply power to the AC bus and the municipal power grid.

5. The photovoltaic and electricity storage integrated energy management system according to claim 1, Features: The control module controls the first switch, the second switch and the third switch to close and controls the fourth switch to open so that the photovoltaic device can supply power to the energy storage module and the AC bus; or the control module controls the first switch, the second switch, the third switch and the fourth switch to close so that the photovoltaic device can supply power to the energy storage module, the municipal power grid and the AC bus.

6. The photovoltaic and electricity storage integrated energy management system according to claim 1, Features: The first switch is an intelligent switch, a photoresistor, a photodiode, a transistor switch, an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor, an electromagnetic switch or a magnetic contact switch.

7. The photovoltaic and electricity storage integrated energy management system according to claim 1, Features: The second switch is an intelligent switch, a transistor switch, an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor, an electromagnetic switch or a magnetic contact switch.

8. The photovoltaic and electricity storage integrated energy management system according to claim 1, Features: The third switch is an intelligent switch, a transistor switch, an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor, an electromagnetic switch or a magnetic contact switch.

9. The photovoltaic and electricity storage integrated energy management system according to claim 1, Features: The fourth switch is an intelligent switch, a transistor switch, an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor, an electromagnetic switch or a magnetic contact switch.

10. The photovoltaic and electricity storage integrated energy management system according to claim 1, Features: The energy storage module includes a battery cell, a charge and discharge circuit and a battery management unit. The battery cell includes a lithium-ion battery or a lead-acid battery. The charge and discharge circuit is connected to the battery cell for charging or discharging. The battery management unit is connected to the charge and discharge circuit and the battery cell; the second switch is connected to the charge and discharge circuit; and the control module is connected to the battery management unit.

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