Transformation power switching system of charging and discharging device

Abstract

The variable-voltage power switching system of the charging and discharging device is an unequal-voltage charging and discharging switching system specially designed for the charging and discharging device. By switching the controller, the medium-voltage energy storage modules in the multi-stage energy storage body realize the running states of charging low voltage and discharging high voltage in different series and parallel modes, so that the running efficiency of the charging and discharging system is improved.

Description

TECHNICAL FIELD

[0001] The utility model discloses a running switching system specially developed for the charging and discharging device of the electric power energy storage system. The electric power energy storage system realizes the cycle control of "charging operation-disconnection-discharging operation-disconnection-charging operation" according to a certain period. In order to ensure that the charging and discharging are in the high efficiency state at the same time, the energy storage operation voltage and the discharging operation voltage of the energy storage body are often required to be inconsistent. The electric power switching system realizes the operation of different voltage grades through the different series connection and parallel connection systems of the multi-stage energy storage body. The system belongs to the technical field of electric power energy storage optimization. BACKGROUND

[0002] With the vigorous development of new energy power generation, the defects of unstable new energy power are increasingly prominent. Therefore, the importance of electric power energy storage gradually appears. According to the characteristics of the electric power charging and discharging system, the lower the voltage of the energy storage module itself is during charging, the higher the operation efficiency is, and vice versa. The higher the voltage of the energy storage module itself is during discharging, the higher the operation efficiency is, and vice versa. The voltage of the energy storage module of the traditional charging and discharging system is generally the same during charging and discharging. Therefore, it is difficult to achieve high efficiency during charging and discharging at the same time. The voltage switching system of the charging and discharging device is designed by setting multi-stage energy storage bodies. The multi-stage energy storage bodies are connected in parallel during charging and connected in series during discharging, so as to realize the purpose of low voltage during charging and high voltage during discharging. The system ensures that the charging and discharging are efficient at the same time. The voltage switching system of the charging and discharging device has not entered the market, and the corresponding control system has not been developed. SUMMARY

[0003] The inventor designs a new voltage switching system of a charging and discharging device as follows:

[0004] A control switching switch (including a switching controller and a switching mechanism), a charging power supply, a multi-stage energy storage body and a power receiver are arranged. The multi-stage energy storage body is composed of two or more equal-pressure energy storage modules. Each equal-pressure energy storage module of the multi-stage energy storage body can be connected in parallel or in series.

[0005] When the switching control switch is switched to charging, the equal-pressure energy storage modules are connected in parallel, the working voltage of the multi-stage energy storage body is low, and a low-voltage charging body is formed. When the switching control switch is switched to discharging, the equal-pressure energy storage modules are connected in series, the working voltage of the multi-stage energy storage body is high, and a high-voltage discharging body is formed. When the switching control switch is switched to disconnection, the charging operation and the discharging operation are all terminated.

[0006] The technical scheme of the utility model is as follows:

[0007] The application discloses a voltage power switching system of a charging and discharging device, which is composed of a switching controller, a charging power supply, a charging contactor, a charging circuit, a multi-stage energy storage body, a power receiver, a discharging contactor and a discharging circuit.

[0008] The equal-pressure energy storage module is connected in parallel to form a low-voltage charging body, and is connected in series to form a high-voltage discharging body.

[0009] The equal-pressure energy storage module is not less than two.

[0010] The equal-pressure energy storage module is not less than two.

[0011] The equal-pressure energy storage module is not less than two.

[0012] The equal-pressure energy storage module is not less than two.

[0013] The equal-pressure energy storage module is not less than two.

[0014] The equal-pressure energy storage module is not less than two.

[0015] The equal-pressure energy storage module is not less than two.

[0016] The equal-pressure energy storage module is not less than two.

[0017] (1) The application discloses a voltage power switching system of a charging and discharging device, which is composed of a switching controller, a charging power supply, a charging contactor, a charging circuit, a multi-stage energy storage body, a power receiver, a discharging contactor and a discharging circuit.

[0018] (2) The application discloses a voltage power switching system of a charging and discharging device, which is composed of a switching controller, a charging power supply, a charging contactor, a charging circuit, a multi-stage energy storage body, a power receiver, a discharging contactor and a discharging circuit.

[0019] (3) The application discloses a voltage power switching system of a charging and discharging device, which is composed of a switching controller, a charging power supply, a charging contactor, a charging circuit, a multi-stage energy storage body, a power receiver, a discharging contactor and a discharging circuit. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1Figure of variable voltage power switching system with two equal pressure energy storage modules as multi-stage energy storage

[0021] Figure 2 Figure of variable voltage power switching system with three equal pressure energy storage modules as multi-stage energy storage

[0022] Figure 3 Figure of variable voltage power switching system with two double series equal pressure energy storage modules as multi-stage energy storage

[0023] Figure 4 Figure of variable voltage power switching system with double series and double parallel equal pressure energy storage modules as multi-stage energy storage

[0024] In the figure:

[0025] 1. Switching controller 2. Switching mechanism 2.0. Synchronous contactor fixer

[0026] 2.11. Equal pressure energy storage module 1 charging contact 2.12. Equal pressure energy storage module 1 discharging contact 2.13. Equal pressure energy storage module 1 parallel contact

[0027] 2.21. Equal pressure energy storage module 2 charging contact 2.22. Equal pressure energy storage module 2 discharging contact 2.23. Equal pressure energy storage module 2 parallel contact

[0028] 2.31. Equal pressure energy storage module 3 charging contact 2.32. Equal pressure energy storage module 3 discharging contact 2.33. Equal pressure energy storage module 3 parallel contact

[0029] 3.1. Equal pressure energy storage module 1 3.2. Equal pressure energy storage module 2 3.3. Equal pressure energy storage module 3

[0030] 3.10. Equal pressure energy storage module 1 negative contact 3.11. Equal pressure energy storage module 1 positive contact

[0031] 3.20. Equal pressure energy storage module 2 negative contact 3.21. Equal pressure energy storage module 2 positive contact

[0032] 3.30. Equal pressure energy storage module 3 negative contact 3.31. Equal pressure energy storage module 3 positive contact

[0033] 4. DC charging power supply 5. Power receiver

[0034] 6. Charging positive bus 6.1. Equal pressure energy storage module 1 charging positive line

[0035] 6.2. Equal pressure energy storage module 2 charging positive line 6.3. Equal pressure energy storage module 3 charging positive line

[0036] 7. Charging negative bus 7.1. Equal pressure energy storage module 1 charging negative line

[0037] 7.2, charging negative pole line of equal pressure energy storage module ②

[0038] 8, discharging positive pole bus

[0039] 10, charging series connection line DETAILED DESCRIPTION

[0040] In the following, the technical scheme of the present application is further described with reference to the accompanying drawings.

[0041] Figure 1 is a variable voltage power switching system diagram of two equal pressure energy storage modules constituting a multi-stage energy storage body. The multi-stage energy storage body in the system is composed of two equal pressure energy storage modules, which is a typical variable voltage power switching system of charging and discharging device. The arrow dotted line represents the control relationship of the switching controller to the switching mechanism. The synchronous contact fixed device is a component of the switching mechanism. The negative pole contact of the equal pressure energy storage module ①, the positive pole contact of the equal pressure energy storage module ①, the negative pole contact of the equal pressure energy storage module ②, and the positive pole contact of the equal pressure energy storage module ② are fixed on the synchronous contact fixed device. The negative pole contact of the equal pressure energy storage module ① is connected with the negative pole of the equal pressure energy storage module ① through a wire, and the positive pole contact of the equal pressure energy storage module ① is connected with the positive pole of the equal pressure energy storage module ① through a wire; the negative pole contact of the equal pressure energy storage module ② is connected with the negative pole of the equal pressure energy storage module ② through a wire, and the positive pole contact of the equal pressure energy storage module ② is connected with the positive pole of the equal pressure energy storage module ② through a wire.

[0042] The charging contact of the equal pressure energy storage module ① is connected with the charging positive pole bus through the charging positive pole line of the equal pressure energy storage module ①; the charging contact of the equal pressure energy storage module ② is connected with the charging positive pole bus through the charging positive pole line of the equal pressure energy storage module ②. The charging positive pole bus is connected with the positive pole of the direct current charging power supply. The parallel contact of the equal pressure energy storage module ① is connected with the charging negative pole bus through the charging negative pole line of the equal pressure energy storage module ①; the parallel contact of the equal pressure energy storage module ② is connected with the charging negative pole bus through the charging negative pole line of the equal pressure energy storage module ②. The charging negative pole bus is connected with the negative pole of the direct current charging power supply.

[0043] The discharging contact of the equal pressure energy storage module ② is connected with the positive pole of the power receiver through a wire; the negative pole of the equal pressure energy storage module ① is connected with the negative pole of the power receiver through a wire; the discharging contact of the equal pressure energy storage module ① is connected with the negative pole of the equal pressure energy storage module ② through the charging series connection line.

[0044] When the controller issues a charging command, the synchronous contact retainer moves to the left, connecting the negative contact of equal-voltage energy storage module ① to its parallel contact point, and the positive contact of equal-voltage energy storage module ① to its charging contact point. Similarly, the negative contact of equal-voltage energy storage module ② connects to its parallel contact point, and the positive contact of equal-voltage energy storage module ② connects to its charging contact point. Equal-voltage energy storage modules ① and ② are connected in parallel to form a low-voltage charging body, also called a multi-stage energy storage system. The DC charging power supply charges the multi-stage energy storage system.

[0045] When the controller issues a discharge command, the synchronizing contact retainer moves to the right, connecting the positive contact of equal-voltage energy storage module ① with its discharge contact, and simultaneously connecting the positive contact of equal-voltage energy storage module ② with its discharge contact. Equal-voltage energy storage modules ① and ② are connected in parallel to form a high-voltage discharge body, also called a multi-stage energy storage body. The multi-stage energy storage body discharges, outputting electrical energy to the receiving device.

[0046] When controller 1 issues a disconnect command, the synchronous contact retainer returns to its original position, charging stops, and discharging stops.

[0047] The present invention will be further described below with reference to typical embodiments.

[0048] Example 1: A transformer-power switching system consisting of two isobaric energy storage modules forming a multi-stage energy storage system. For example... Figure 1 As shown, the energy storage device consists of two isobaric energy storage modules, which is a typical transformer power switching system for a charging and discharging device. Figure 1 In the diagram, the dashed arrows indicate the control relationship between the switching controller 1 and the switching mechanism 2. The synchronous contact holder 2.0 is a component of the switching mechanism 2. The negative contact 3.10 and positive contact 3.11 of the isobaric energy storage module ①, the negative contact 3.20 and positive contact 3.21 of the isobaric energy storage module ② are fixed to the synchronous contact holder 2.0. The negative contact 3.10 of the isobaric energy storage module ① is connected to the negative terminal of the isobaric energy storage module ① 3.1 via a wire, and the positive contact 3.11 of the isobaric energy storage module ① is connected to the positive terminal of the isobaric energy storage module ① 3.1 via a wire; the negative contact 3.20 of the isobaric energy storage module ② is connected to the negative terminal of the isobaric energy storage module ② 3.2 via a wire, and the positive contact 3.21 of the isobaric energy storage module ② is connected to the positive terminal of the isobaric energy storage module ② 3.2 via a wire.

[0049] The charging contact 2.11 of the isobaric energy storage module 1 is connected with the charging positive bus 6 through the charging positive line 6.1 of the isobaric energy storage module 1; the charging contact 2.21 of the isobaric energy storage module 2 is connected with the charging positive bus 6 through the charging positive line 6.2 of the isobaric energy storage module 2. The charging positive bus 6 is connected with the positive pole of the direct current charging power supply 4. The parallel contact 2.13 of the isobaric energy storage module 1 is connected with the charging negative bus 7 through the charging negative line 7.1 of the isobaric energy storage module 1; the parallel contact 2.23 of the isobaric energy storage module 2 is connected with the charging negative bus 7 through the charging negative line 7.2 of the isobaric energy storage module 2. The charging negative bus 7 is connected with the negative pole of the direct current charging power supply 4.

[0050] The discharging contact 2.22 of the isobaric energy storage module 2 is connected with the positive pole of the power receiver 5 through a wire; the negative pole of the isobaric energy storage module 1 3.1 is connected with the negative pole of the power receiver 5 through a wire; the discharging contact 2.12 of the isobaric energy storage module 1 is connected with the negative pole of the isobaric energy storage module 2 through the charging series line 10.

[0051] In the figure, when the controller 1 issues a charging instruction, the synchronous contact fixer 2.0 moves left, the negative pole contact 3.10 of the isobaric energy storage module 1 is connected with the parallel contact 2.13 of the isobaric energy storage module 1, the positive pole contact 3.11 of the isobaric energy storage module 1 is connected with the charging contact 2.11 of the isobaric energy storage module 1, the negative pole contact 3.20 of the isobaric energy storage module 2 is connected with the parallel contact 2.23 of the isobaric energy storage module 2, and the positive pole contact 3.21 of the isobaric energy storage module 2 is connected with the charging contact 2.21 of the isobaric energy storage module 2. The isobaric energy storage module 1 3.1 and the isobaric energy storage module 2 3.2 are connected in parallel to form a low-voltage charging body, also called a multi-stage energy storage body. The direct current charging power supply 4 charges the multi-stage energy storage body.

[0052] In the figure, when the controller 1 issues a discharging instruction, the synchronous contact fixer 2.0 moves right, the positive pole contact 3.11 of the isobaric energy storage module 1 is connected with the discharging contact 2.12 of the isobaric energy storage module 1, and the positive pole contact 3.21 of the isobaric energy storage module 2 is connected with the discharging contact 2.22 of the isobaric energy storage module 2. The isobaric energy storage module 1 3.1 and the isobaric energy storage module 2 3.2 are connected in parallel to form a high-voltage discharging body, also called a multi-stage energy storage body. The multi-stage energy storage body discharges to output electric energy to the power receiver 5.

[0053] In the figure, when the controller 1 issues a disconnection instruction, the synchronous contact fixer 2.0 returns to the original position, the charging stops, and the discharging stops.

[0054] Example 2: A variable voltage power switching system in which three isobaric energy storage modules form a multi-stage energy storage body, as shown in Figure 2 .

[0055] Multi-stage energy storage body is composed of three equal-pressure energy storage modules. Compared with embodiment 1, one equal-pressure energy storage module ③ 3.3 is added, and the equal-pressure energy storage module ③ charging contact 2.31, the equal-pressure energy storage module ③ discharging contact 2.32, the equal-pressure energy storage module ③ parallel contact 2.33, the equal-pressure energy storage module ③ negative electrode contact 3.30, the equal-pressure energy storage module ③ positive electrode contact 3.31, the equal-pressure energy storage module ③ charging positive electrode line 6.3, the equal-pressure energy storage module ③ charging negative electrode line 7.3, and the charging series connection line 10 are also added.

[0056] The equal-pressure energy storage module ③ negative electrode contact 3.30 and the equal-pressure energy storage module ③ positive electrode contact 3.31 are fixed on the synchronous contact fixer 2.0.

[0057] Compared with embodiment 1, the energy storage capacity of the energy storage body is increased by 50%.

[0058] The working principle is the same as that of embodiment 1, which is not described here.

[0059] Embodiment 3: Two double-string equal-pressure energy storage modules constitute a multi-stage energy storage body variable voltage power switching system, as shown in Figure 3 .

[0060] The controller structure, action principle and method of embodiment 3 are completely the same as those of embodiment 1. The difference is that two equal-pressure energy storage module string-level access systems are connected, and compared with embodiment 1, the energy storage capacity of the energy storage body is increased by 1 times, and the charging voltage and discharging voltage are increased by 1 times.

[0061] Embodiment 4: Two double-string, double-parallel equal-pressure energy storage modules constitute a multi-stage energy storage body variable voltage power switching system, as shown in Figure 4 .

[0062] The controller structure, action principle and method of embodiment 4 are completely the same as those of embodiment 3. The difference is that two string-level equal-pressure energy storage modules are connected in parallel. Compared with embodiment 3, the energy storage capacity of the energy storage body is increased by 1 times.

[0063] By analogy, the number of equal-pressure energy storage modules can be increased by series-parallel connection, so as to increase the capacity of the energy storage body and improve the voltage level.

Claims

1. A variable voltage power switching system for a charge-discharge device, comprising a switching controller, a charging power source, a charging contactor, a charging line, a multi-stage energy accumulator, a DC power receiver, a discharging contactor, and a discharging line, characterized in that: The multi-stage energy accumulator is composed of two or more equal-pressure energy storage modules; the multi-stage energy accumulator is connected with the charging power source through a charging circuit and a charging contactor; the multi-stage energy accumulator is connected with the direct-current power receiver through a discharging circuit and a discharging contactor; the equal-pressure energy storage modules are connected in parallel to form a low-voltage charging body; the equal-pressure energy storage modules are connected in series to form a high-voltage discharging body; and the direct-current power receiver is an alternating-current power grid and a direct-current input terminal of an alternating-current and direct-current electrical appliance.

2. The voltage conversion power switching system of claim 1, wherein: The equal-pressure energy storage module is not less than two.

3. The voltage conversion power switching system of claim 1, wherein: The plurality of equal-pressure energy storage modules are combined to form the multi-stage energy accumulator in three modes of series connection, parallel connection and series-parallel hybrid connection according to needs.

4. The voltage conversion power switching system of claim 1, wherein: The switching controller has three groups of contacts of charging, disconnecting and discharging.

5. The system according to claim 1, wherein: The switching contacts of the charging contactor and the discharging contactor are allowed to be arranged on different sliding members, rotating contact members, electromagnetic contactors and other action switches.

6. The system according to claim 1, wherein: The system core component is composed of a synchronous switch with at least two groups of positive switching contacts and negative conduction contacts controlled by the controller; the positive and negative switching positions are also exchanged.

7. The system according to claim 1, wherein: The action of the switching controller is allowed to be one of manual, automatic and intelligent switching.

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