Transformation power switching system of charging and discharging device

Abstract

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

Description

Technical Field

[0001] This invention is an operation switching system specifically developed for the charging and discharging devices of power energy storage systems. Power energy storage systems operate in a cyclical manner, performing "charging operation - disconnection - discharging operation - disconnection - charging operation." To ensure high efficiency during both charging and discharging, the energy storage operating voltage and the discharging operating voltage often need to be different. This power switching system achieves different voltage levels by using multiple energy storage units connected in series and parallel configurations. This system belongs to the field of power energy storage optimization technology. Background Technology

[0002] With the vigorous development of new energy power generation, the instability of new energy power is becoming increasingly prominent. Therefore, the importance of power storage is gradually emerging. According to the characteristics of power charging and discharging systems, during charging, the lower the voltage of the energy storage module itself, the higher the operating efficiency, and vice versa; during discharging, the higher the voltage of the energy storage module itself, the higher the operating efficiency, and vice versa. In traditional charging and discharging systems, the voltage of the energy storage module itself is generally the same during charging and discharging, making it difficult to achieve simultaneous high efficiency in both charging and discharging operations. The transformer power switching system of the charging and discharging device, through a multi-stage energy storage design, connects multiple energy storage stages in parallel during charging and in series during discharging, thereby achieving the goal of low voltage during charging and high voltage during discharging. This system ensures simultaneous high efficiency in both charging and discharging. Currently, the transformer power switching system for the charging and discharging device has not yet entered the market, and the corresponding control system has not been developed. Summary of the Invention

[0003] The inventors designed the following new transformer power switching system for a charging and discharging device:

[0004] The system includes a control switch (including a switch controller and switching mechanism), a charging power supply, a multi-stage energy storage system, and a power receiving unit. The multi-stage energy storage system consists of two or more isobaric energy storage modules. The isobaric energy storage modules in the multi-stage energy storage system can be connected in parallel or in series.

[0005] When the switching control switch is turned to charging, the equal-voltage energy storage modules form a parallel structure, and the multi-stage energy storage cells operate at low voltage, forming a low-voltage charging body; when the switching control switch is turned to discharging, the equal-voltage energy storage modules form a series structure, and the multi-stage energy storage cells operate at high voltage, forming a high-voltage discharging body; when the switching control switch is turned to disconnect, both charging and discharging operations are terminated.

[0006] The technical solution of the present invention is as follows:

[0007] A transformer power switching system for a charging and discharging device comprises a switching controller, a charging power supply, a charging contactor, a charging line, a multi-stage energy storage body, a power receiving body, a discharge contactor, and a discharge line. The system is characterized in that: the multi-stage energy storage body consists of two or more equal-voltage energy storage modules; the multi-stage energy storage body is connected to the charging power supply via the charging line and the charging contactor; and the multi-stage energy storage body is connected to the DC power receiving body via the discharge line and the discharge contactor.

[0008] The invention is further characterized in that: the equal-pressure energy storage modules are connected in parallel to form a low-voltage charging body; and the equal-pressure energy storage modules are connected in series to form a high-voltage discharging body.

[0009] A further feature of this invention is that there are no fewer than two isobaric energy storage modules.

[0010] The invention is further characterized in that multiple isobaric energy storage modules are combined in series, parallel, or series-parallel hybrid modes as needed to form a multi-stage energy storage system.

[0011] The present invention is further characterized in that: the DC power receiving body is an inverter AC power grid and a DC input terminal for AC / DC electrical appliances.

[0012] The invention is further characterized in that the switching controller has three sets of contacts for charging, disconnecting, and discharging.

[0013] The invention is further characterized in that the switching contacts between the charging contactor and the discharging contactor can be set on sliding members, rotary contacts, electromagnetic contactors and other operating switches of different shapes.

[0014] The invention is further characterized in that: the action is controlled by the controller, and the synchronous switcher with at least two sets of positive switching contacts and negative conducting contacts constitutes the core component of the system, which is within the protection scope of the invention; the same applies to the exchange of positive and negative positions.

[0015] The invention is further characterized by allowing the switching controller to switch between manual, automatic, and intelligent modes.

[0016] The beneficial effects of this invention are:

[0017] (1) The present invention provides a transformer power switching system for the charging and discharging device of the energy storage system, which provides sufficient possibility for the charging and discharging transformer operation of the energy storage system.

[0018] (2) This invention greatly improves the operating efficiency of energy storage systems.

[0019] (3) This invention establishes a new path for the efficient and energy-saving operation of energy storage systems. Attached Figure Description

[0020] Figure 1 This is a diagram of a transformer power switching system consisting of two isobaric energy storage modules forming a multi-stage energy storage system.

[0021] Figure 2 This is a diagram of a transformer power switching system consisting of three isobaric energy storage modules forming a multi-stage energy storage system.

[0022] Figure 3 This is a diagram of a transformer power switching system consisting of two dual-string equal-voltage energy storage modules forming a multi-stage energy storage system.

[0023] Figure 4 This is a diagram of a transformer power switching system consisting of dual-series and dual-parallel equal-voltage energy storage modules forming a multi-stage energy storage system.

[0024] In the picture:

[0025] 1. Switching controller; 2. Switching mechanism; 2.0. Synchronous electric shock retainer

[0026] 2.11. Isobaric energy storage module ① Charging contact; 2.12. Isobaric energy storage module ① Discharging contact.

[0027] 2.13, Isobaric energy storage module ① and contact point

[0028] 2.21. Charging contact of isobaric energy storage module ② 2.22. Discharging contact of isobaric energy storage module ②

[0029] 2.23, Isobaric energy storage module ② and contact points

[0030] 2.31. Equal-voltage energy storage module ③ Charging contact; 2.32. Equal-voltage energy storage module ③ Discharge contact.

[0031] 2.33, Isobaric energy storage module ③ and contact point

[0032] 3.1 Isobaric Energy Storage Module ① 3.2 Isobaric Energy Storage Module ② 3.3 Isobaric Energy Storage Module ③

[0033] 3.10, Isobaric energy storage module ① Negative contact; 3.11, Isobaric energy storage module ① Positive contact.

[0034] 3.20, Isobaric energy storage module ② negative contact; 3.21, Isobaric energy storage module ② positive contact.

[0035] 3.30, Isobaric energy storage module ③ Negative contact; 3.31, Isobaric energy storage module ③ Positive contact.

[0036] 4. DC charging power supply 5. Power receiving element

[0037] 6.1 Charging Positive Bus, Isobaric Energy Storage Module ① Charging Positive Circuit

[0038] 6.2 Isobaric Energy Storage Module ② Charging Positive Circuit 6.3 Isobaric Energy Storage Module ③ Charging Positive Circuit

[0039] 7.1 Charging Negative Bus, Equivalent Voltage Energy Storage Module ① Charging Negative Circuit

[0040] 7.2, Isobaric Energy Storage Module ② Charging Negative Circuit; 7.3, Isobaric Energy Storage Module ③ Charging Negative Circuit

[0041] 8. Discharge positive bus 9. Discharge negative bus

[0042] 10. Charging series cable Detailed Implementation

[0043] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0044] Figure 1 This is a diagram of a transformer power switching system consisting of two isobaric energy storage modules forming a multi-stage energy storage system. The system's multi-stage energy storage system comprises two isobaric energy storage modules, representing a typical transformer power switching system for charging and discharging devices. The dashed arrows indicate the control relationship between the switching controller and the switching mechanism. The synchronizing contact holder is a component of the switching mechanism. The negative and positive contacts of isobaric energy storage module ①, the negative and positive contacts of isobaric energy storage module ②, are fixed to the synchronizing contact holder. The negative contact of isobaric energy storage module ① is connected to the negative terminal of isobaric energy storage module ① via a wire, and the positive contact of isobaric energy storage module ① is connected to the positive terminal of isobaric energy storage module ① via a wire; the negative contact of isobaric energy storage module ② is connected to the negative terminal of isobaric energy storage module ② via a wire, and the positive contact of isobaric energy storage module ② is connected to the positive terminal of isobaric energy storage module ② via a wire.

[0045] The charging contacts of isobaric energy storage module ① are connected to the positive charging bus via the positive charging line of isobaric energy storage module ①; the charging contacts of isobaric energy storage module ② are connected to the positive charging bus via the positive charging line of isobaric energy storage module ②. The positive charging bus is connected to the positive terminal of the DC charging power supply. The parallel contacts of isobaric energy storage module ① are connected to the negative charging bus via the negative charging line of isobaric energy storage module ①; the parallel contacts of isobaric energy storage module ② are connected to the negative charging bus via the negative charging line of isobaric energy storage module ②. The negative charging bus is connected to the negative terminal of the DC charging power supply.

[0046] The discharge contact of the equal-pressure energy storage module ② is connected to the positive terminal of the power receiving body through a wire; the negative terminal of the equal-pressure energy storage module ① is connected to the negative terminal of the power receiving body through a wire; the discharge contact of the equal-pressure energy storage module ① is connected to the negative terminal of the equal-pressure energy storage module ② through a charging series wire.

[0047] 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.

[0048] 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.

[0049] When controller 1 issues a disconnect command, the synchronous contact retainer returns to its original position, charging stops, and discharging stops.

[0050] The present invention will now be further described with reference to typical embodiments.

[0051] 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 equal-pressure energy storage module ①, the negative contact 3.20 and positive contact 3.21 of the equal-pressure energy storage module ② are fixed to the synchronous contact holder 2.0. The negative contact 3.10 of the equal-pressure energy storage module ① is connected to the negative terminal of the equal-pressure energy storage module ① 3.1 via a wire, and the positive contact 3.11 of the equal-pressure energy storage module ① is connected to the positive terminal of the equal-pressure energy storage module ① 3.1 via a wire; the negative contact 3.20 of the equal-pressure energy storage module ② is connected to the negative terminal of the equal-pressure energy storage module ② 3.2 via a wire, and the positive contact 3.21 of the equal-pressure energy storage module ② is connected to the positive terminal of the equal-pressure energy storage module ② 3.2 via a wire.

[0052] The charging contact 2.11 of the equal-voltage energy storage module ① is connected to the positive charging bus 6 via the positive charging line 6.1 of the equal-voltage energy storage module ①; the charging contact 2.21 of the equal-voltage energy storage module ② is connected to the positive charging bus 6 via the positive charging line 6.2 of the equal-voltage energy storage module ②. The positive charging bus 6 is connected to the positive terminal of the DC charging power supply 4. The parallel contact 2.13 of the equal-voltage energy storage module ① is connected to the negative charging bus 7 via the negative charging line 7.1 of the equal-voltage energy storage module ①; the parallel contact 2.23 of the equal-voltage energy storage module ② is connected to the negative charging bus 7 via the negative charging line 7.2 of the equal-voltage energy storage module ②. The negative charging bus 7 is connected to the negative terminal of the DC charging power supply 4.

[0053] The discharge contact 2.22 of the equal-pressure energy storage module ② is connected to the positive terminal of the power receiving body 5 through a wire; the negative terminal of the equal-pressure energy storage module ① 3.1 is connected to the negative terminal of the power receiving body 5 through a wire; the discharge contact 2.12 of the equal-pressure energy storage module ① is connected to the negative terminal of the equal-pressure energy storage module ② through the charging series wire 10.

[0054] In the diagram, when controller 1 issues a charging command, the synchronous contact retainer 2.0 moves to the left, connecting the negative contact 3.10 of the equal-voltage energy storage module ① with its parallel contact 2.13, the positive contact 3.11 of the equal-voltage energy storage module ① with its charging contact 2.11, the negative contact 3.20 of the equal-voltage energy storage module ② with its parallel contact 2.23, and the positive contact 3.21 of the equal-voltage energy storage module ② with its charging contact 2.21. The equal-voltage energy storage modules ① 3.1 and ② 3.2 are connected in parallel to form a low-voltage charging body, also called a multi-stage energy storage body. The DC charging power supply 4 charges the multi-stage energy storage body.

[0055] In the diagram, when controller 1 issues a discharge command, the synchronous contact retainer 2.0 moves to the right, connecting the positive contact 3.11 of the equal-voltage energy storage module ① with its discharge contact 2.12, and connecting the positive contact 3.21 of the equal-voltage energy storage module ② with its discharge contact 2.22. The equal-voltage energy storage modules ① 3.1 and ② 3.2 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 body 5.

[0056] In the diagram, when controller 1 issues a disconnect command, the synchronous contact retainer 2.0 returns to its original position, charging stops, and discharging stops.

[0057] Example 2: A transformer power switching system consisting of three isobaric energy storage modules forming a multi-stage energy storage system, such as... Figure 2 As shown.

[0058] Compared with Example 1, the multi-stage energy storage system, which consists of three equal-pressure energy storage modules forming a charging and discharging device, adds an equal-pressure energy storage module ③3.3. Correspondingly, it adds the following: equal-pressure energy storage module ③ charging contact 2.31, equal-pressure energy storage module ③ discharging contact 2.32, equal-pressure energy storage module ③ parallel contact 2.33, equal-pressure energy storage module ③ negative contact 3.30, equal-pressure energy storage module ③ positive contact 3.31, equal-pressure energy storage module ③ charging positive line 6.3, equal-pressure energy storage module ③ charging negative line 7.3, and charging series line 10.

[0059] The negative contact 3.30 and positive contact 3.31 of the isobaric energy storage module ③ are fixed on the synchronous contact holder 2.0.

[0060] Compared to Example 1, the energy storage capacity of the energy storage body is increased by 50%.

[0061] Its working principle is the same as that of Example 1, and will not be repeated here.

[0062] Example 3: A transformer power switching system consisting of two dual-string equal-voltage energy storage modules forming a multi-stage energy storage system, such as... Figure 3 As shown.

[0063] The controller structure and operating principle of Example 3 are exactly the same as those of Example 1. The difference is that two equal-pressure energy storage modules are connected in series in the system. Compared with Example 1, the energy storage capacity of the energy storage body is increased by 1 time, and the charging voltage and discharging voltage are also increased by 1 time.

[0064] Example 4: A transformer power switching system consisting of two dual-series, dual-parallel equal-voltage energy storage modules forming a multi-stage energy storage system, such as... Figure 4 As shown.

[0065] The controller structure and operating principle of Example 4 are exactly the same as those of Example 3. The difference is that two cascaded equal-voltage energy storage modules are connected in parallel to the system. Compared with Example 3, the energy storage capacity of the energy storage body is increased by 100%.

[0066] Similarly, the number of equal-pressure energy storage modules can be increased by connecting them in series and parallel, thereby increasing the energy storage capacity and improving the voltage level.

Claims

1. A transformer power switching system for a charging and discharging device, comprising a switching controller, a charging power supply, a charging contactor, a charging line, a multi-stage energy storage system, a power receiving body, a discharging contactor, and a discharging line, characterized in that: The multi-stage energy storage system consists of two or more equal-voltage energy storage modules; the multi-stage energy storage system is connected to the charging power supply through charging lines and charging contactors; the multi-stage energy storage system is connected to the DC power receiver through discharge lines and discharge contactors.

2. The transformer power switching system of the charging and discharging device according to claim 1, characterized in that: The isobaric energy storage modules are connected in parallel to form a low-voltage charging body; the isobaric energy storage modules are connected in series to form a high-voltage discharging body.

3. The transformer power switching system of the charging and discharging device according to claim 1, characterized in that: There should be no fewer than two isobaric energy storage modules.

4. The transformer power switching system of the charging and discharging device according to claim 1, characterized in that: Multiple isobaric energy storage modules can be combined in series, parallel, or series-parallel hybrid configurations to form a multi-stage energy storage system as needed.

5. The transformer power switching system of the charging and discharging device according to claim 1, characterized in that: The DC power receiver is the inverter AC power grid and the DC input terminal of AC / DC electrical appliances.

6. The transformer power switching system of the charging and discharging device according to claim 1, characterized in that: The switching controller has three sets of contacts for charging, disconnecting, and discharging.

7. The transformer power switching system of the charging and discharging device according to claim 1, characterized in that: The switching contacts for charging and discharging contactors can be installed on various types of sliders, rotary contacts, electromagnetic contactors, and other actuated switches.

8. The transformer power switching system of the charging and discharging device according to claim 1, characterized in that: The synchronous switch, which is controlled by the controller and has at least two sets of positive switching contacts and negative conducting contacts, constitutes the core component of the system and is within the scope of protection of this invention; the same applies when the positive and negative poles are switched.

9. The transformer power switching system of the charging and discharging device according to claim 1, characterized in that: The controller can be switched to one of three modes: manual, automatic, or intelligent switching.

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