PCS core control module based on CAN FD bus

Abstract

A PCS core control module based on a CAN FD bus is composed of a PCS core control module shell, an input and output expansion ring, a CAN FD bus socket, a PCB A, a PCB B and a PCB C. According to the PCS core control module based on the CAN FD bus, an energy storage battery pack, a public power grid and the PCS core control module organically form a network-forming type energy storage system in a CAN FD local area bus mode. Due to effective intervention of the CAN FD bus, the PCS core module is not a pure control device any more and becomes an information node in regional power grid big data processing, the most important control algorithms of the PCS energy storage converter are all concentrated in the core control module in real time, and the core control module is small, exquisite, flexible and high in reliability. Repeated development of various similar and heavy PCS control cabinets can be completely replaced.

Description

TECHNICAL FIELD

[0001] The present application relates to a PCS core control module based on CAN FD bus, mainly applied to the centralized expansion charging or discharging control of the bidirectional energy storage converter (PCS) between the power grid and the energy storage cell assembly, and the addition of the CAN FD bus greatly promotes the development of the network type energy storage system. BACKGROUND

[0002] The bidirectional energy storage converter (PCS) is an important control device of the new energy storage battery pack. This type of control product connects the PCS controller and the energy storage cell assembly with the public power grid together, converts the AC power in the power grid into DC power during the low valley period of the power grid load, thereby charging the energy storage cell assembly, and converts the DC power in the energy storage cell assembly into AC power meeting the requirements of the power grid during the peak period of the power grid load, and feeds back to the public power grid. Therefore, the PCS control product has the function of bidirectional energy storage converter. Because it is mainly used for bidirectional conversion, it can be widely used in grid-connected and off-grid power systems and realizes the flexible interface between energy storage and the power grid. Under the control of the PCS, the energy storage battery pack is changing into a virtual synchronous power plant or a regional uninterrupted microgrid.

[0003] It is worth pointing out that the size and specifications of the bidirectional energy storage converter (PCS) applied in different scenarios are different, which depends on the application scenarios of the customers and the capacity requirements of the energy storage battery pack. Generally, there are centralized PCS, group string distributed PCS and centralized and distributed PCS. These PCS control systems are heavy and large in appearance, and have complex and numerous connections, thereby providing an opportunity for the present invention. Because everything complicated is not clean and smooth, it is caused by complex manufacturing of hypocrisy, and brings many out-of-control and troubles. Of course, it cannot last long, so the present invention patent application follows the principle of governing the complex by the simple.

[0004] Accordingly, the present application proposes a PCS core control module based on CAN FD network bus, which has the following unique advantages:

[0005] Firstly, it has some properties that the system structure graph and space can remain unchanged after continuously changing shape, that is, the bidirectional energy storage converter (PCS) based on the CAN FD network bus has the stability and safety of the expanded input / output variable control system structure between the power grid and the energy storage cell assembly.

[0006] Second, it combines the CAN FD local control network with the public power grid, and through the online programmable technology of hardware, it becomes the best interface between the public power grid and the energy storage cell assembly, and through the PCS core control module, it serves as the core component of the PCS control box or control cabinet to realize the purpose of core module co-governance and resource sharing, so it is suitable for various dynamic energy storage application occasions, so it opens up the relationship between how to expand functions in limited space to realize the integrity of the system structure, greatly improving the performance and efficiency of the system;

[0007] Third, in view of the characteristics of the large number of energy storage cell assemblies, in order to make the bidirectional energy storage converter (PCS) system the most economical and optimal as a whole, the application boldly implements cross-border innovation in the PCS control module, and introduces the CAN FD local bus which is completely unrelated to the PCS control into the module. Since the control network based on the CAN FD bus is adopted, the development trend of the grid-forming energy storage battery system is further met, which can quickly expand the number of energy storage cell assemblies and timely respond to the requirements of the power grid peak clipping and valley filling and smoothing new energy fluctuations. Since the double-loop control algorithm and SPWM pulse modulation method are adopted in the PCS control module, the AC / DC bidirectional conversion in the four-quadrant operation is realized, and the active support for the grid voltage frequency is strengthened. SUMMARY

[0008] Accordingly, the applicant proposes a PCS core control module design scheme based on CAN FD bus, which is completely different from the traditional technical idea. The specific content is as follows:

[0009] A PCS core control module based on CAN FD bus is composed of a PCS core control module shell, an input / output expansion ring, a CAN FD bus socket and three PCB circuit boards. The PCB circuit boards include PCB circuit board A, PCB circuit board B and PCB circuit board C. The input / output expansion ring includes input / output expansion ring pins. The module shell outer thread is further included in the PCS core control module shell. The key points are as follows:

[0010] The CAN FD bus socket is welded on the PCB circuit board A, and the conductive positioning copper column is connected with the PCB circuit board B after passing through the fixing screw hole on the PCB circuit board A; the single-chip microcomputer chip CAN FD bus interface chip, A / D conversion chip, D / A conversion chip are attached on the upper surface of the PCB circuit board B, and four micro switches are welded, so that the four pin signals of the CAN FD bus socket are transmitted to the PCB circuit board B through the conductive positioning copper column; the input and output expansion ring has an input and output expansion ring inner sleeve positioning hole, and the conductive positioning copper column is connected with the input and output expansion ring inner sleeve positioning hole after passing through the fixing screw hole on the PCB circuit board A and the PCB circuit board B, so as to guide the four pin signals of the CAN FD bus socket to the input and output expansion ring; the PCB circuit board C is installed on the PCB circuit board C support, and the input and output expansion ring pin on the input and output expansion ring is welded on the PCB circuit board C, and the output input expansion socket and the photoelectric isolation chip are welded around the PCB circuit board C, and the on-line programmable chip is attached on the center of the PCB circuit board C, which can change the pin definition of the on-line programmable chip in real time; the center of the PCB circuit board C support has an internal thread, and when assembled, the PCS core control module shell is connected with the PCB circuit board C support through the module shell external thread.

[0011] Further, the PCS core control module shell and the CAN FD bus socket are both made of high-temperature-resistant engineering plastic by injection molding.

[0012] Further, the control module has two expansion modes in the topology structure: one is to support the opening on the next level PCS control cabinet panel, and then embed the PCS core control module based on the CAN FD bus in the opening on the control cabinet panel; the other is to weld the output input expansion socket on the PCB circuit board C on the PCB circuit board in the PCS control box, and then fix the PCS control box with screws through the support fixing hole of the PCB circuit board C support.

[0013] Further, the four micro switches are used for presetting the current CAN FD bus node ID address number.

[0014] Further, the CAN FD bus socket is four-wire, which is CAN+, CAN-, +5V and common ground wire. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings needed in the embodiments. Obviously, the drawings described below only show some of the embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative effort.

[0016] Figure 1 A PCS core control module appearance based on CAN FD bus Figure One ;

[0017] Figure 2 A PCS core control module appearance based on CAN FD bus Figure Two ;

[0018] Figure 3 A PCS core control module based on CAN FD bus is exploded Figure One ;

[0019] Figure 4 A PCS core control module based on CAN FD bus is exploded Figure Two ;

[0020] Figure 5 A PCS core control module based on CAN FD bus is exploded Figure Three ;

[0021] Figure 6 Remove the shell of the PCS core control module after the decomposition Figure One ;

[0022] Figure 7 Remove the shell of the PCS core control module after the decomposition Figure Two ;

[0023] Figure 8 Remove the shell of the PCS core control module after the decomposition Figure Three ;

[0024] Figure 9 Remove the shell of the PCS core control module after the decomposition of the PCS core control module Figure One ;

[0025] Figure 10 Remove the shell of the PCS core control module after the decomposition of the PCS core control module Figure Two .

[0026] 1 PCB circuit board A

[0027] 1-1 fixed screw hole

[0028] 1-2 conductive positioning copper column

[0029] 2 PCB circuit board B

[0030] 2-1 Single-chip microcomputer chip

[0031] 2-2 CAN FD bus interface chip

[0032] 2-3 A / D conversion chip

[0033] 2-4 D / A conversion chip

[0034] 2-5 4-bit micro switch

[0035] 3 PCB circuit board C

[0036] 3-1 Output input expansion socket

[0037] 3-2 Socket pin on output expansion ring

[0038] 3-3 On-line programmable chip

[0039] 3-4 Optoelectronic isolation chip

[0040] 3-5 Input output expansion ring positioning hole

[0041] 3-6 Output input expansion socket pin

[0042] 4 CAN FD bus socket

[0043] 5 PCS core control module shell

[0044] 5-1 Module shell outer thread

[0045] 6 PCB circuit board C bracket

[0046] 6-1 Bracket fixing hole

[0047] 6-2 PCB circuit board C bracket center inner thread

[0048] 7 Input output expansion ring

[0049] 7-1 Input output expansion ring pin DETAILED DESCRIPTION

[0050] The specific embodiments of the present application will be described below in conjunction with the accompanying drawings:

[0051] The application discloses a PCS core control module based on a CAN FD bus, which is composed of a PCS core control module shell (5), an input and output expansion ring (7), a CAN FD bus socket (4) and three PCB circuit boards, wherein the PCB circuit boards comprise a PCB circuit board A (1), a PCB circuit board B (2) and a PCB circuit board C (3), the input and output expansion ring (7) comprises an input and output expansion ring lead (7-1), and the PCS core control module shell (5) further comprises a module shell outer thread (5-1).

[0052] The CAN FD bus socket (4) is welded on the PCB circuit board A (1), the conductive positioning copper column (1-2) of the CAN FD bus socket (4) is connected with the PCB circuit board B (2) after penetrating through the fixed screw hole (1-1) on the PCB circuit board A (1), the single-chip microcomputer chip (2-1), the CAN FD bus interface chip (2-2), the A / D conversion chip (2-3) and the D / A conversion chip (2-4) are attached to the upper surface of the PCB circuit board B (2), and the four microswitches (2-5) are welded, so that the four lead signals of the CAN FD bus socket (4) are transmitted to the PCB circuit board B (2) through the conductive positioning copper column (1-2), the input and output expansion ring (7) is provided with an input and output expansion ring inner sleeve positioning hole (3-5), the conductive positioning copper column (1-2) of the input and output expansion ring (7) is connected with the input and output expansion ring inner sleeve positioning hole (3-5) after penetrating through the fixed screw hole (1-1) on the PCB circuit board A (1) and the PCB circuit board B (2), so as to guide the four lead signals of the CAN FD bus socket (4) to the input and output expansion ring (7), the PCB circuit board C (3) is installed on the PCB circuit board C support (6), the input and output expansion ring lead (7-1) of the input and output expansion ring (7) is welded on the PCB circuit board C (3), the input and output expansion socket (3-1) and the photoelectric isolation chip (3-4) are welded around the PCB circuit board C (3), the on-line programmable chip (3-3) is attached to the center of the PCB circuit board C (3), the pin definition of the on-line programmable chip (3-3) can be changed in real time, and the center of the PCB circuit board C support (6) is provided with an inner thread (6-2), when assembled, the PCS core control module shell (5) is connected with the PCB circuit board C support (6) through the module shell outer thread (5-1).

[0053] Furthermore, the PCS core control module shell (5) and the CAN FD bus socket are all made of high-temperature-resistant engineering plastic by injection molding.

[0054] Further, the control module has two expansion modes in topology: one is to support the opening of the PCS control cabinet panel at the next level, and then embed the PCS core control module based on the CAN FD bus in the opening of the control cabinet panel; the other is to weld the output and input expansion socket (3-1) on the PCB circuit board C (3) on the PCB circuit board in the PCS control box, and then fix the PCS control box together with the PCB circuit board C support (6) through the support fixing hole (6-1) of the support.

[0055] Further, the 4-position micro switch (2-5) is used for presetting the current CAN FD bus node ID address number.

[0056] Further, the CAN FD bus socket (4) is four-wire, CAN+, CAN-, +5V, and common ground. Advantages

[0057] The application proposes a PCS core control module based on CAN FD bus, which meets the low coupling requirement between the core control module of the bidirectional energy storage converter (PCS) and external components, and meets the high cohesion inside the module, so as to improve the stability of the system. Although the network bottom layer protocol of the module follows CAN2.0B, it fully meets the development trend of the grid-forming energy storage system, so that the core module of the controller is no longer a simple PCS terminal control component, and has the function of local area network control and information transmission, effectively forming an important information node in the big data environment of regional power grid.

[0058] The most substantial improvement of the application is to realize the modularization, intelligentization and network expansion in the new energy field, and to carry out the so-called cross-border innovation, and introduce the CAN FD local area bus which is completely not related to the PCS control into the module. As a result, the penetration and integration produce a new concept. Originally, the local area network formed by CAN FD helps us to jump out of the traditional control field, changes the embarrassment of the information island of the non-network PCS control cabinet, and makes the PCS core control module start to expand with tension, that is, multiple PCS core control modules can be cascaded together, and have the function of information broadcasting and communication. Originally, many new market opportunities come from industry, cross-border and integration.

[0059] Secondly, the application adopts a single-chip microcomputer with powerful, multi-core and multi-thread structure and an online programmable chip, so that the real-time operation of multitasking can be performed, and the most important control algorithms of the PCS energy storage converter in peak shaving, valley filling, frequency modulation, phase modulation and emergency standby starting can be completed in the core control module.

[0060] The PCS core control module adopts a double closed-loop control algorithm and a SPWM pulse modulation method, and adopts a field programmable hardware design technology, so that AC / DC bidirectional conversion in four quadrants can be realized, the active support for the grid voltage frequency is strengthened, the requirements of peak shaving and valley filling of the grid and smooth new energy fluctuation can be quickly responded, and the active support for the grid voltage frequency is strengthened.

[0061] Thirdly, the application designs a novel integrated topology structure, so that the whole installation process becomes simple and convenient, especially the embedded multi-platform control software and the online programmable hardware configuration, the real-time control requirements of CAN local area network bus control, energy storage converter (PCS), electromagnetic manager (BMS) and energy manager (EMS) are met, so that the system is most economical and the whole is most optimal.

[0062] Obviously, this century is the century of two networks, the information highway is mainly the international Internet Internet, and the industrial field bus is the CAN bus world, and the CAN bus is the only international standard local area network approved by the ISO organization. The PCS core control module based on the CAN FD bus is an upgraded version of the CAN bus protocol, which organically forms an energy storage system with the energy storage battery pack, the public power grid and the PCS controller through the CAN FD (English CAN with Flexible Data-Rate) local bus mode. In 2012, CAN FD was released by Bosch Company in Germany to meet the demand of high bandwidth and large data field length of unmanned cars under the condition of artificial intelligence. Since the CAN FD bus inherits the advantages of the standard CAN bus, standardizes the compatibility between any two CAN nodes, and upgrades the 8-byte data packet to 64 bytes, has a variable transmission baud rate and a non-destructive arbitration structure, so that its application range has far exceeded the automobile industry, and has developed and penetrated into the fields of new energy battery management, numerical control machine tools, medical instruments, electric locomotives, ships, community security management and the like, and is recognized as one of the most promising industrial field buses, and naturally becomes the interconnection specification of field control equipment. As a result, due to the effective intervention of the CAN FD bus, the PCS core controller is no longer a simple new energy storage battery terminal control device, but an information node in the regional power grid big data processing.

[0063] The most important control algorithm of the PCS energy storage converter in real-time peak shaving, valley filling, frequency modulation, phase modulation and emergency backup is concentrated in the core control module, and the core control module is small and flexible, and can be called at any time, and can completely replace the repeated development of the similar and heavy PCS control cabinet, and the development prospect is quite optimistic.

[0064] It should be pointed out that, in the specification, the principles and operation modes of the application are described through specific implementation examples, and are only used to help understand the core idea of the application, and should not be understood as limiting the application. It is understood by those skilled in the art that various changes made in form and detail to the application without departing from the spirit and scope of the application defined in the appended claims, all belong to the protection scope of the application.

Claims

1. A PCS core control module based on CAN FD bus, which is composed of a PCS core control module shell (5), an input and output expansion ring (7), a CAN FD bus socket (4) and three PCB circuit boards, wherein the PCB circuit boards comprise: PCB circuit board A (1), PCB circuit board B (2), PCB circuit board C (3), the input and output expansion ring (7) includes input and output expansion ring pin (7-1), the PCS core control module shell (5) also includes module shell outer thread (5-1), characterized in that: The CAN FD bus socket (4) is welded on the PCB circuit board A (1), and the conductive positioning copper column (1-2) is connected with the PCB circuit board B (2) after passing through the fixed screw hole (1-1) on the PCB circuit board A (1); The single-chip microcomputer chip (2-1) CAN FD bus interface chip (2-2), A / D conversion chip (2-3), D / A conversion chip (2-4) are attached to the upper surface of the PCB circuit board B (2), and four microswitches (2-5) are welded, so that the four pin signals of the CAN FD bus socket (4) are transmitted to the PCB circuit board B (2) through the conductive positioning copper column (1-2); The input and output expansion ring (7) has an input and output expansion ring inner sleeve positioning hole (3-5), and the conductive positioning copper column (1-2) passes through the fixed screw hole (1-1) on the PCB circuit board A (1) and the PCB circuit board B (2) and is connected with the input and output expansion ring inner sleeve positioning hole (3-5), so as to guide the four pin signals of the CAN FD bus socket (4) to the input and output expansion ring (7); The PCB circuit board C (3) is installed on the PCB circuit board C support (6), and the input and output expansion ring pin (7-1) on the input and output expansion ring (7) is welded on the PCB circuit board C (3). The PCB circuit board C (3) is welded with an input and output expansion socket (3-1) and an opto-isolator chip (3-4) around the PCB circuit board C (3), and an on-line programmable chip (3-3) is attached to the center of the PCB circuit board C (3). The pin definition of the on-line programmable chip (3-3) can be changed in real time; The center of the PCB circuit board C support (6) has an inner thread (6-2), and the PCS core control module shell (5) is connected with the PCB circuit board C support (6) through the module shell outer thread (5-1) during assembly.

2. The PCS core control module based on CAN FD bus according to claim 1, characterized in that: The PCS core control module shell (5) and the CAN FD bus socket are both high-temperature-resistant engineering plastic injection molded.

3. The PCS core control module based on CAN FD bus according to claim 1, characterized in that: The control module has two expansion modes in the topology structure: one is to support the opening on the next level PCS control cabinet panel, and then embed the PCS core control module based on CAN FD bus in the opening of the control cabinet panel; The second is to weld the output and input expansion socket (3-1) on the PCB circuit board C (3) on the PCB circuit board in the PCS control box, and then fix the PCS control box with screws through the support fixing hole (6-1) of the PCB circuit board C support (6).

4. The PCS core control module based on CAN FD bus according to claim 1, characterized in that: The four microswitches (2-5) are used for presetting the current CAN FD bus node ID address number.

5. The PCS core control module based on CAN FD bus according to claim 1, characterized in that: The CAN FD bus socket (4) is four-wire, CAN+, CAN-, +5V, common ground wire.

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