Photovoltaic integrated power generation and energy storage system

Abstract

The utility model discloses a kind of photovoltaic integrated power generation energy storage systems, including load, PCS bidirectional current transformer, energy storage battery and photovoltaic power generation module, the load is automobile charging module SER, the PCS bidirectional current transformer is connected with automobile charging module SER, the energy storage battery is connected with PCS bidirectional current transformer, the photovoltaic power generation module is connected with PCS bidirectional current transformer, the PCS bidirectional current transformer is used to control the electric energy of photovoltaic power generation module is load power supply or charges energy storage battery.By load, PCS bidirectional current transformer, energy storage battery and photovoltaic power generation module are respectively modularized design, and the control of electric energy is realized by PCS bidirectional current transformer;Photovoltaic power generation module provides electric energy when there is sunlight, uses by PCS for load, if there is surplus, energy storage battery can be charged;When the electric energy provided by photovoltaic module is not enough, energy storage battery is discharged by PCS, and is used for load.

Description

Technical Field

[0001] This utility model relates to the field of energy storage systems, and in particular to a photovoltaic integrated power generation and energy storage system. Background Technology

[0002] In analyzing energy storage processes, the defined area of ​​objects or space used to determine the research object is called the energy storage system. It includes the input and output of energy and matter, and the energy conversion and storage devices. Energy storage systems often involve multiple energy sources, devices, materials, and processes, making them complex energy systems that change over time. Multiple indicators are needed to describe their performance. Commonly used evaluation indicators include energy density, energy storage power, energy storage efficiency, energy storage price, and environmental impact.

[0003] Although there are existing systems that use photovoltaics and grid power to store electrical energy, their structures are relatively complex, such as Chinese patent CN202421469673.7. Utility Model Content

[0004] The main purpose of this invention is to propose a photovoltaic integrated power generation and energy storage system, which aims to improve existing energy storage systems by integrating photovoltaic and grid power.

[0005] To achieve the above objectives, this utility model proposes a photovoltaic integrated power generation and energy storage system, comprising:

[0006] The load is a car charging module SER;

[0007] PCS bidirectional converter, wherein the PCS bidirectional converter is connected to the vehicle charging module SER;

[0008] An energy storage battery, which is connected to the PCS bidirectional converter;

[0009] A photovoltaic power generation module is connected to a PCS bidirectional converter, which is used to control the power of the photovoltaic power generation module to supply power to the load or charge the energy storage battery.

[0010] With the development of energy storage systems, modular design of various components is one of the key factors. Its advantages are that it is replicable, easy to assemble, and thus reduces production costs.

[0011] This application modularizes the load, PCS bidirectional converter, energy storage battery and photovoltaic power generation module, and uses the PCS bidirectional converter to control the power.

[0012] Specifically,

[0013] Photovoltaic power generation modules provide electricity when there is sunlight, which is then supplied to the load via PCS. Any surplus can be used to charge the energy storage battery.

[0014] When the power provided by the photovoltaic module is insufficient, the energy storage battery discharges through the PCS to supply power to the load.

[0015] In this design, the mains power is not connected to the mains power supply, thereby reducing the complexity of switching. Attached Figure Description

[0016] Fig. 1 This is a framework diagram of the present utility model;

[0017] Fig. 2 The circuit diagrams for each module of this utility model are shown below.

[0018] Fig. 3 Circuit diagram of CDQ module for charging gun. Detailed Implementation

[0019] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0020] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0021] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0022] like Figs. 1 to 3 As shown, a photovoltaic integrated power generation and energy storage system includes:

[0023] The load is a car charging module SER;

[0024] PCS bidirectional converter, wherein the PCS bidirectional converter is connected to the vehicle charging module SER;

[0025] An energy storage battery, which is connected to the PCS bidirectional converter;

[0026] A photovoltaic power generation module is connected to a PCS bidirectional converter, which is used to control the power of the photovoltaic power generation module to supply power to the load or charge the energy storage battery.

[0027] With the development of energy storage systems, modular design of various components is one of the key factors. Its advantages are that it is replicable, easy to assemble, and thus reduces production costs.

[0028] This application modularizes the load, PCS bidirectional converter, energy storage battery and photovoltaic power generation module, and uses the PCS bidirectional converter to control the power.

[0029] Specifically,

[0030] Photovoltaic power generation modules provide electricity when there is sunlight, which is then supplied to the load via PCS. Any surplus can be used to charge the energy storage battery.

[0031] When the power provided by the photovoltaic modules is insufficient, the energy storage battery discharges through the PCS to supply power to the load.

[0032] In this design, the mains power is not connected to the mains power supply, thereby reducing the complexity of switching.

[0033] The PCS bidirectional converter includes energy conversion in two directions:

[0034] Rectifier mode: Converts alternating current (AC) to direct current (DC) to charge the battery pack (AC→DC);

[0035] Inverter mode: Converts the direct current (DC) from the battery pack into alternating current (AC) and supplies it to the load (DC→AC).

[0036] Specifically, the load is also connected to an STS switch.

[0037] The STS switch is connected to the ATS switch, which is used to control the connection to mains power or a diesel generator.

[0038] When neither the photovoltaic module nor the energy storage module can provide enough power, the mains power or diesel generator will come into play. If there is any power left over, it can be used to charge the battery.

[0039] ATS can automatically switch between mains power and diesel generator; STS can quickly switch between PCS and mains power or diesel generator.

[0040] ATS (Automatic Transfer Switch)

[0041] Role: "Macro Decision Maker" It monitors the quality of two independent power sources (e.g., mains power (primary) and generator (backup)).

[0042] Action: When the main power supply fails (power outage, abnormal voltage / frequency), the ATS will automatically start the generator (if necessary) and, after the generator stabilizes, mechanically switch the entire load line from the main power supply to the backup power supply. Upon restoration, it will switch back.

[0043] Features: Mechanical action, relatively slow switching time (usually on the order of several seconds).

[0044] STS (Static Transfer Switch)

[0045] The role of the "micro-executor" is typically installed downstream of the ATS, receiving two available power sources from the ATS (such as AC mains and generator, or two different AC mains sources).

[0046] Action: It continuously monitors the quality of both input power supplies. If even a very brief (a few milliseconds) fluctuation or interruption occurs on the power supply that is currently being powered, STS will switch the critical load to the other normal power supply very quickly (usually within 4ms).

[0047] Features: Solid-state electronic switches (such as thyristors) operate at extremely fast speeds, ensuring uninterrupted operation of sophisticated IT equipment (servers, storage, etc.).

[0048] This ensures the safety of the circuit.

[0049] Specifically, the car charging module SER is connected to a switch QF2.

[0050] The switch QF2 is connected to the PCS bidirectional converter and the STS switch respectively, which not only protects electrical safety, but also ensures rapid switching when power supply requirements are different.

[0051] Specifically, the car charging module SER is connected to a charging gun.

[0052] Specifically, the switch QF2 is connected in series with a grounded load LOAD.

[0053] Specifically, a first line and a second line are provided between the charging gun and the car charging module SER.

[0054] The first circuit is connected in series with a fuse FU and a contact switch KM1;

[0055] The second circuit is connected in series with a shunt FL and a contact switch KM2. KM1 and KM2 are power supply control contactors for the charging gun, and FL is the shunt that detects charging parameters. The car charging module SER is a DC power supply.

[0056] Specifically, the charging gun is a CDQ module. (CDQ module is an electrical detection and quality monitoring module.)

[0057] Function: It is the "brain" and "sentinel" of the circuit, responsible for:

[0058] Connection Confirmation: Check if the charging gun is fully connected to the vehicle and locked (CC / CP signal detection);

[0059] Insulation testing: Before and during charging, the insulation performance of the entire circuit to ground is tested to prevent the risk of leakage.

[0060] Fault diagnosis: Real-time monitoring of parameters such as voltage and current; once an abnormality (overvoltage, undervoltage, overcurrent) is detected, KM1 and KM2 are immediately ordered to disconnect.

[0061] Communication: Communicates with the BMS of the electric vehicle to negotiate charging power, voltage, current, etc.

[0062] Specifically, an input switch QF1 is provided between the ATS switch and the STS switch to receive the power supply switching signal.

[0063] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A photovoltaic integrated power generation and energy storage system, characterized in that, include: The load, wherein the load is an automotive charging module SER; PCS bidirectional converter, wherein the PCS bidirectional converter is connected to the vehicle charging module SER; An energy storage battery, which is connected to the PCS bidirectional converter; A photovoltaic power generation module is connected to a PCS bidirectional converter, which is used to control the power of the photovoltaic power generation module to supply power to the load or charge the energy storage battery.

2. The photovoltaic integrated power generation and energy storage system as described in claim 1, characterized in that: The load is also connected to an STS switch. The STS switch is connected to the ATS switch, which is used to control the connection to mains power or a diesel generator.

3. The photovoltaic integrated power generation and energy storage system as described in claim 1, characterized in that: The car charging module SER is connected to a switch QF2. The switch QF2 is connected to the PCS bidirectional converter and the STS switch respectively.

4. The photovoltaic integrated power generation and energy storage system as described in claim 1, characterized in that: The car charging module SER is connected to a charging gun.

5. The photovoltaic integrated power generation and energy storage system as described in claim 3, characterized in that: The switch QF2 is connected in series with a grounded load LOAD.

6. The photovoltaic integrated power generation and energy storage system as described in claim 4, characterized in that: A first line and a second line are provided between the charging gun and the car charging module SER. The first circuit is connected in series with a fuse FU and a contact switch KM1; The second line is connected in series with a shunt FL and a contact switch KM2.

7. The photovoltaic integrated power generation and energy storage system as described in claim 6, characterized in that: The charging gun is a CDQ module.

8. The photovoltaic integrated power generation and energy storage system as described in claim 2, characterized in that: An input switch QF1 is provided between the ATS switch and the STS switch.

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