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. Through effective intervention of the CAN FD bus, a PCS core module is not a pure control device any more and becomes an information node in regional power grid big data processing, and most important control algorithms of a PCS energy storage converter in the aspects of peak shaving, valley filling, frequency modulation, phase modulation and accident standby are concentrated in the core control module in real time. The core control module is small and flexible, and can completely replace repeated development of various similar and heavy PCS control cabinets.

Description

Technical Field

[0001] The present invention relates to a PCS core control module based on a CAN FD bus, which is mainly used for centralized extended charging or discharging control of a bidirectional energy storage converter (PCS) between a power grid and an energy storage cell assembly. Background Art

[0002] Bidirectional energy storage converter (PCS) is an important control device for new energy storage battery packs. This type of control product connects the PCS controller and energy storage battery components to the public power grid. During the low load period of the power grid, the AC power in the power grid is converted into DC power to charge the energy storage battery components. During the peak load period of the power grid, the DC power in the energy storage battery components is converted into AC power that meets the requirements of the power grid and fed back to the public power grid. Therefore, the PCS control product has the function of a bidirectional energy storage converter. Because it is based on bidirectional conversion as its main working purpose, it can be widely used in grid-connected and off-grid power systems, and realizes a flexible interface between energy storage and the power grid. With the support of PCS control, energy storage battery packs are transforming into virtual synchronous power plants or regional uninterrupted microgrids.

[0003] It is worth pointing out that the size and specifications of the bidirectional energy storage converter (PCS) used in different scenarios are different, which depends entirely on the customer's application scenario and the requirements for the capacity of the energy storage battery pack. Generally, there are centralized PCS, string-distributed PCS and distributed PCS. These PCS control systems are heavy and large in appearance, with complex and numerous connections, which also provides an opportunity for this invention innovation application, because everything complicated seems to be not clean and tidy, and complexity creates hypocrisy, and also brings a lot of loss of control and trouble, which of course cannot last long. Therefore, this invention patent application follows the principle of simplifying the complex.

[0004] Accordingly, the concept of a PCS core control module based on a CAN FD network bus proposed in the present invention has the following unique advantages: First, it has some properties that the system structure graph and space can remain unchanged after continuous shape change, that is, this bidirectional energy storage converter (PCS) based on the CAN FD network bus has the stability and security of the expanded control system structure with multiple input / output variables between the grid and the energy storage cell components; Second, it combines the CAN FD local control network with the public power grid, and through the hardware online programmable technology, it becomes the best interface between the public power grid and the energy storage battery components. The PCS core control module is used as the core component of the PCS control box or control cabinet to achieve the purpose of core module co-governance and resource sharing, so it is suitable for various dynamic energy storage applications. Therefore, it opens up the relationship of how to expand functions in a limited space to achieve the integrity of the system structure, greatly improving the performance and efficiency of the system; Third, in view of the characteristics of numerous energy storage battery components, in order to make the bidirectional energy storage converter (PCS) system the most economical and optimal overall, the present invention boldly implements cross-border innovation in the PCS control module, and introduces the CAN FD local bus, which has nothing to do with PCS control, into the module. Since a control network based on the CAN FD bus is adopted, the development trend of grid-forming energy storage battery systems is further met. It can quickly expand the number of energy storage battery components and respond to the requirements of peak shaving and valley filling of the power grid and smoothing fluctuations of new energy in a timely manner. Since a dual closed-loop control algorithm and an SPWM pulse modulation method are adopted in the PCS control module, AC / DC bidirectional conversion in four-quadrant operation can be realized, thereby strengthening the active support for the voltage and frequency of the power grid. Summary of the invention

[0005] Based on this, the applicant proposed a PCS core control module design based on the CAN FD bus that is completely different from the traditional technical ideas.

[0006] The specific contents are as follows: A PCS core control module based on a CAN FD bus is composed of a PCS core control module housing, an input / output expansion ring, a CAN FD bus socket, and three PCB circuit boards, wherein 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, and the PCS core control module housing also includes module housing external threads. The main points are: The CAN FD bus socket is welded on the PCB circuit board A, and its conductive positioning copper column passes through the fixing screw hole on the PCB circuit board A and is connected to the PCB circuit board B; The PCB circuit board B is surface-mounted with a single-chip microcomputer chip CAN FD bus interface chip, an A / D conversion chip, and a D / A conversion chip, and is welded with a 4-position micro switch, 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 pillars; The input / output expansion ring is provided with an input / output expansion ring inner bushing positioning hole, and the conductive positioning copper column passes through the fixing screw hole on the PCB circuit board A and the PCB circuit board B, and then is connected to the input / output expansion ring inner bushing positioning hole, thereby guiding the four pin signals of the CAN FD bus socket to the input / output expansion ring; The PCB circuit board C is mounted on the PCB circuit board C bracket, the input and output expansion ring pins on the input and output expansion ring are welded on the PCB circuit board C, the PCB circuit board C is welded with output and input expansion sockets and photoelectric isolation chips around it, and an online programmable chip is mounted on the center of the PCB circuit board C, and the pin definition of the online programmable chip can be changed in real time; The center of the PCB circuit board C bracket is provided with an internal thread. During assembly, the PCS core control module housing is connected to the PCB circuit board C bracket as a whole through the module housing external thread.

[0007] Furthermore, the PCS core control module housing and the CAN FD bus socket are both injection-molded high-temperature resistant engineering plastics.

[0008] Furthermore, the control module has two expansion modes in terms of topological structure: one is to support opening a hole on the panel of the PCS control cabinet at the next level, and then embed and install the PCS core control module based on the CAN FD bus in the hole on the control cabinet panel; the other is to directly weld it to the PCB circuit board in the PCS control box through the output and input expansion socket on the PCB circuit board C, and then use screws to pass through the bracket fixing holes of the PCB circuit board C bracket to fix it to the PCS control box.

[0009] Furthermore, the 4-position micro switch is used to preset the current CAN FD bus node ID address number.

[0010] Furthermore, the CAN FD bus socket is a four-wire system, namely CAN+, CAN-, +5V, and a common ground wire.

[0011] Furthermore, the CAN FD bus protocol and the control algorithm program code for real-time peak shaving, valley filling, frequency modulation, phase modulation and emergency backup are solidified in the single-chip microcomputer chip, and the CAN FD bus interface chip provides an electrical level interface compatible with the CAN FD local area network. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, without paying creative labor, they can also draw inferences from one example and obtain other similar drawings based on these drawings.

[0013] Figure 1 A PCS core control module based on CAN FD bus Figure 1 ; Figure 2 A PCS core control module based on CAN FD bus Figure 2 ; Figure 3 A PCS core control module decomposition based on CAN FD bus Figure 1 ; Figure 4 A PCS core control module decomposition based on CAN FD bus Figure 2 ; Figure 5 A PCS core control module decomposition based on CAN FD bus Figure 3 ; Figure 6 Disassembly after removing the PCS core control module housing Figure 1 ; Figure 7 Disassembly after removing the PCS core control module housing Figure 2 ; Figure 8 Disassembly after removing the PCS core control module housing Figure 3 ; Fig. 9 PCS core control module disassembly after removing the PCS core control module housing Figure 1 ; Fig.10 PCS core control module disassembly after removing the PCS core control module housing Figure 2 .

[0014] 1 PCB circuit board A 1-1 Fixing screw hole 1-2 Conductive positioning copper pillars 2 PCB circuit board B 2-1 MCU chip 2-2 CAN FD bus interface chip 2-3 A / D conversion chip 2-4 D / A conversion chip 2-5 4-position micro switch 3 PCB circuit board C 3-1 Input / output expansion socket 3-2 Socket pins on output expansion ring 3-3 Online Programmable Chip 3-4 Photoelectric isolation chip 3-5 Input and output expansion ring positioning hole 3-6 Input / output expansion socket pins 4 CAN FD bus sockets 5 PCS core control module housing 5-1 External thread of module housing 6 PCB circuit board C bracket 6-1 Bracket fixing hole 6-2 PCB circuit board C bracket center internal thread 7 Input and output expansion ring 7-1 Input and output expansion ring pins DETAILED DESCRIPTION The specific implementation of the present invention is described below in conjunction with the accompanying drawings: A PCS core control module based on a CAN FD bus, comprising a PCS core control module housing (5), an input / 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 / output expansion ring (7) comprises an input / output expansion ring pin (7-1), and the PCS core control module housing (5) further comprises a module housing external thread (5-1). The main points are: The CAN FD bus socket (4) is welded on the PCB circuit board A (1), and its conductive positioning copper pillar (1-2) passes through the fixing screw hole (1-1) on the PCB circuit board A (1) and is connected to the PCB circuit board B (2); The PCB circuit board B (2) is provided with a single-chip microcomputer chip (2-1), a CAN FD bus interface chip (2-2), an A / D conversion chip (2-3), and a D / A conversion chip (2-4) mounted on the surface thereof, and is also welded with a 4-position micro switch (2-5), so that the four pin signals of the CAN FD bus socket (4) are transmitted to the PCB circuit board B (2) via the conductive positioning copper pillars (1-2); The input / output expansion ring (7) is provided with an input / output expansion ring inner bushing positioning hole (3-5), and the conductive positioning copper column (1-2) passes through the fixing screw hole (1-1) on the PCB circuit board A (1) and the PCB circuit board B (2), and then is connected to the input / output expansion ring inner bushing positioning hole (3-5), thereby guiding the four pin signals of the CAN FD bus socket (4) to the input / output expansion ring (7); The PCB circuit board C (3) is mounted on a PCB circuit board C bracket (6); the input / output expansion ring pins (7-1) on the input / output expansion ring (7) are welded to the PCB circuit board C (3); the PCB circuit board C (3) is welded with input / output expansion sockets (3-1) and photoelectric isolation chips (3-4) around the PCB circuit board C (3); an online programmable chip (3-3) is surface-mounted at the center of the PCB circuit board C (3); and the pin definition of the online programmable chip (3-3) can be changed in real time; The center of the PCB circuit board C bracket (6) is provided with an internal thread (6-2). During assembly, the PCS core control module housing (5) is connected to the PCB circuit board C bracket (6) via the module housing external thread (5-1).

[0015] Furthermore, the PCS core control module housing (5) and the CAN FD bus socket are both injection-molded high-temperature resistant engineering plastics.

[0016] Furthermore, the control module has two expansion modes in terms of topological structure: one is to support opening a hole on the panel of the next-level PCS control cabinet, and then embed and install the PCS core control module based on the CAN FD bus in the hole on the panel of the control cabinet; the other is to directly weld it to the PCB circuit board in the PCS control box through the output and input expansion socket (3-1) on the PCB circuit board C (3), and then use screws to pass through the bracket fixing hole (6-1) of the PCB circuit board C bracket (6) to fix it together with the PCS control box.

[0017] Furthermore, the 4-position micro switch (2-5) is used to preset the ID address number of the current CAN FD bus node.

[0018] Furthermore, the CAN FD bus socket (4) is a four-wire system, namely CAN+, CAN-, +5V, and a common ground wire.

[0019] Furthermore, the CAN FD bus protocol and control algorithm program codes for real-time peak regulation, valley filling, frequency modulation, phase modulation and emergency standby are solidified in the single-chip microcomputer chip (2-1), and the CAN FD bus interface chip (2-2) provides an electrical level interface compatible with the CAN FD local area network. Beneficial Effects

[0020] The present invention proposes a PCS core control module based on CAN FD bus. The core control module of this bidirectional energy storage converter (PCS) meets the low coupling requirements with external components, and the internal of the module meets the high cohesion 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 grid-forming energy storage system, so that the core module of this controller is no longer a simple PCS terminal control component, and it has local network control and information transmission functions, effectively forming an important information node in the big data environment under the regional power grid.

[0021] The most substantial improvement of the present invention is that it realizes modularization, intelligence and networking expansion in the field of new energy, and carries out so-called cross-border innovation, and introduces the CAN FD local bus, which has nothing to do with PCS control, into the module. As a result, this permeable fusion has produced a new concept, and by the way, it also allows the inventor to understand Mr. Hegel's famous assertion: "Familiarity is not equal to true knowledge". It turns out that the local network formed by CAN FD helps us jump out of the traditional control field, changes the embarrassment of the information island where the non-networked PCS control cabinet is located, and enables the PCS core control module to begin a full expansion, that is, multiple PCS core control modules can also be cascaded together, and have the function of broadcasting information to the outside. It turns out that many new market opportunities come from industries, thrive in cross-borders, and succeed in integration.

[0022] Secondly, the present invention adopts a powerful, multi-core, multi-threaded single-chip microcomputer and online programmable chip, so it can perform real-time operations of multiple tasks at the same time, and can concentrate the most important control algorithms of the PCS energy storage inverter in peak regulation, valley filling, frequency modulation, phase modulation and emergency standby startup in the core control module in real time. This core control module is small and adopts an embedded installation mode, which can completely replace the repeated development of similar and bulky PCS control cabinets.

[0023] The PCS core control module adopts a dual closed-loop control algorithm and SPWM pulse modulation method, and uses field-programmable hardware design technology to achieve AC / DC bidirectional conversion in four-quadrant operation, strengthen the active support for grid voltage and frequency, and can quickly respond to the requirements of grid peak shaving and valley filling and smoothing new energy fluctuations, thereby strengthening the active support for grid voltage and frequency.

[0024] Secondly, the present invention has designed a new integrated topology structure, making the entire installation process simple and convenient, especially the embedded multi-platform control software and online programmable hardware configuration, which combines the real-time control requirements of CAN local area network bus control, energy storage converter (PCS), electromagnetic manager (BMS) and energy manager (EMS), thereby ensuring the most economical system and the best overall performance.

[0025] Obviously, this century is the century of two major networks. The information highway is dominated by the Internet, while the industrial field bus is dominated by the CAN bus. The CAN bus is also the only international standard local area network approved by the ISO organization. The present invention introduces a PCS core control module based on the CAN FD bus, which is an upgraded version of the CAN bus protocol. It organically forms a network-type energy storage system with energy storage battery packs, public power grids and PCS controllers through the extended CAN FD (CAN with Flexible Data-Rate) local bus mode. In 2012, CAN FD was released by Bosch of Germany to meet the needs of unmanned vehicles under artificial intelligence conditions for high bandwidth and large data volume data field length. 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, with a variable transmission baud rate and a non-destructive arbitration structure, its application range has far exceeded the automotive industry, and has penetrated into the fields of new energy battery management, CNC machine tools, medical instruments, electric locomotives, ships, and community security management. It is recognized as one of the most promising industrial field buses and has naturally become the interconnection specification of field control equipment. As a result, it is precisely because of the effective intervention of the CAN FD bus that the PCS core controller is no longer a simple new energy storage battery terminal control device, but has become an information node in the regional power grid big data processing. The present invention concentrates the most important control algorithms of the PCS energy storage converter in real-time peak regulation, valley filling, frequency modulation, phase modulation and accident standby in the core control module. This core control module is small and flexible and can be called at any time. It can completely replace the repeated development of similar and bulky PCS control cabinets, and its development prospects are quite optimistic.

[0026] It should be pointed out that in this specification, the principles and operation modes of the present invention are described through specific implementation examples, which are only used to help understand the core idea of ​​the present invention and should not be understood as limiting the present invention. Those skilled in the art will understand that various changes made to the present invention in form and details without departing from the spirit and scope of the present invention defined in the attached claims are within the scope of protection of the present invention.

Claims

1. A PCS core control module based on a CAN FD bus, comprising a PCS core control module housing (5), an input / output expansion ring (7), a CAN FD bus socket (4) and three PCB circuit boards, wherein the PCB circuit boards include: PCB circuit board A (1), PCB circuit board B (2), PCB circuit board C (3), the input and output expansion ring (7) includes an input and output expansion ring pin (7-1), and the PCS core control module housing (5) also includes a module housing external thread (5-1), characterized in that: The CAN FD bus socket (4) is welded on the PCB circuit board A (1), and its conductive positioning copper pillar (1-2) passes through the fixing screw hole (1-1) on the PCB circuit board A (1) and is connected to the PCB circuit board B (2); The PCB circuit board B (2) is provided with a single-chip microcomputer chip (2-1), a CAN FD bus interface chip (2-2), an A / D conversion chip (2-3), and a D / A conversion chip (2-4) mounted on the surface thereof, and is also welded with a 4-position micro switch (2-5), so that the four pin signals of the CAN FD bus socket (4) are transmitted to the PCB circuit board B (2) via the conductive positioning copper pillars (1-2); The input / output expansion ring (7) is provided with an input / output expansion ring inner bushing positioning hole (3-5), and the conductive positioning copper column (1-2) passes through the fixing screw hole (1-1) on the PCB circuit board A (1) and the PCB circuit board B (2), and then is connected to the input / output expansion ring inner bushing positioning hole (3-5), thereby guiding the four pin signals of the CAN FD bus socket (4) to the input / output expansion ring (7); The PCB circuit board C (3) is mounted on a PCB circuit board C bracket (6); the input / output expansion ring pins (7-1) on the input / output expansion ring (7) are welded to the PCB circuit board C (3); the PCB circuit board C (3) is welded with input / output expansion sockets (3-1) and photoelectric isolation chips (3-4) around the PCB circuit board C (3); an online programmable chip (3-3) is surface-mounted at the center of the PCB circuit board C (3); and the pin definition of the online programmable chip (3-3) can be changed in real time; The center of the PCB circuit board C bracket (6) is provided with an internal thread (6-2). During assembly, the PCS core control module housing (5) is connected to the PCB circuit board C bracket (6) via the module housing external thread (5-1).

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

3. A PCS core control module based on CAN FD bus according to claim 1, characterized in that: The control module has two expansion modes in terms of topological structure: one is to support opening a hole on the panel of the next-level PCS control cabinet, and then embed and install the PCS core control module based on the CAN FD bus in the hole on the panel of the control cabinet; the other is to directly weld it to the PCB circuit board in the PCS control box through the output and input expansion socket (3-1) on the PCB circuit board C (3), and then use screws to pass through the bracket fixing holes (6-1) of the PCB circuit board C bracket (6) to fix it to the PCS control box.

4. The PCS core control module based on the CAN FD bus according to claim 1, characterized in that: The 4-position micro switch (2-5) is used to preset the ID address number of the current CAN FD bus node.

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

6. A PCS core control module based on CAN FD bus according to claim 1, characterized in that: The CAN FD bus protocol and control algorithm program codes for real-time peak regulation, valley filling, frequency modulation, phase modulation and emergency standby are solidified in the single-chip microcomputer chip (2-1), and the CAN FD bus interface chip (2-2) provides an electrical level interface compatible with the CAN FD local area network.

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