Medium-voltage direct-hanging digital converter system
By designing a medium-voltage direct-hook digital converter system with a multi-level control architecture, the problems of control complexity and inefficiency in the existing technology are solved, and efficient control of the medium-voltage direct-hook digital converter and the stability and flexibility of the system are realized.
Patent Information
- Application Number
- CN202510295571.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2025-06-06
AI Technical Summary
The lack of an effective control architecture in the prior art to manage medium voltage direct-mounted digital converters, resulting in problems of control complexity and inefficiency in practical applications.
A medium-voltage direct-mounted digital converter system is designed, adopting a multi-level control architecture, including a computer, a synchronous control box, a high-voltage AC control box, a low-voltage DC control box, a multi-channel high-voltage AC module control board and a multi-channel low-voltage DC module control board. The system achieves precise control of each module of the medium voltage direct-mounted digital converter through hierarchical control signal allocation and synchronization.
It realizes efficient control of medium voltage direct-mounted digital converters, improves the stability and flexibility of the system, and can meet the needs of the integrated automation system of the substation.
Smart Images
Figure CN120110178A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of electric power technology, and in particular to a medium voltage direct-mounted digital converter system. Background Art
[0002] The energy storage converter (PCS, Power Conversion System) can control the charging and discharging process of the battery, perform AC-DC conversion, and directly supply power to the AC load when there is no power grid. Some energy storage converters adopt a modular architecture, which can be called a medium-voltage direct-mounted digital converter. It is necessary to provide an available control architecture for the medium-voltage direct-mounted digital converter. Summary of the invention
[0003] Based on this, it is necessary to provide a medium voltage direct-mounted digital converter system to address the above technical issues.
[0004] The present application provides a medium voltage direct-mounted digital converter system, the system comprising a medium voltage direct-mounted digital converter and a control system, wherein the control system comprises:
[0005] The host computer and synchronous control box at the first level, the high-voltage AC control box and low-voltage DC control box at the second level, and the multi-channel high-voltage AC module control board and multi-channel low-voltage DC module control board at the third level;
[0006] The host computer is used to send control signals to the high-voltage AC control box and the low-voltage DC control box;
[0007] The high voltage AC control box is used to divide the control signal into multiple control signals;
[0008] The low voltage DC control box is used to divide the control signal into multiple control signals;
[0009] Under the synchronization action of the synchronization control box, the high-voltage AC control box sends multiple control signals to each high-voltage AC module control board, and the low-voltage DC control box sends multiple control signals to each low-voltage DC module control board;
[0010] Each high-voltage AC module control board sends the received control signal to the corresponding high-voltage AC module in the medium-voltage direct-mounted digital converter;
[0011] Each low-voltage DC module control board sends the received control signal to the corresponding low-voltage DC module in the medium-voltage direct-mounted digital converter.
[0012] In one embodiment, the high-voltage AC module control board is connected to the high-voltage AC modules in the medium-voltage direct-mounted digital converter in a one-to-one correspondence.
[0013] In one of the embodiments, the low voltage DC module control board is connected to the low voltage DC modules in the medium voltage direct-mounted digital converter in a one-to-one correspondence.
[0014] In one of the embodiments, the high-voltage AC control box and the industrial computer interact with each other through a switch, and the low-voltage DC control box and the industrial computer interact with each other through a switch.
[0015] In one of the embodiments, the protocol used for communication between the industrial computer and the high-voltage AC control box is a protocol with fast frames and small data volume.
[0016] In one of the embodiments, the protocol used for communication between the industrial computer and the low-voltage DC control box is a protocol with fast frames and small data volume.
[0017] In one of the embodiments, the protocol used for communication between the medium voltage direct-mounted digital converter and the monitoring system in the substation integrated automation system is a protocol with slow frames and large data volume.
[0018] In one of the embodiments, the protocol used for communication between the medium voltage direct-mounted digital converter and the control and protection system in the substation integrated automation system is a protocol with fast frames and small data volume.
[0019] In one of the embodiments, the high voltage AC control box in the control system communicates with the voltage and current merging unit, and the low voltage DC control box communicates with the voltage and current merging unit.
[0020] In one embodiment, the number of the high-voltage AC module control boards is consistent with the number of the high-voltage AC modules; the number of the low-voltage DC module control boards is consistent with the number of the low-voltage DC modules.
[0021] The control system provided by the present application includes: a host computer and a synchronous control box located at the first level, a high-voltage AC control box and a low-voltage DC control box located at the second level, and a multi-channel high-voltage AC module control board and a multi-channel low-voltage DC module control board located at the third level; the host computer is used to send control signals to the high-voltage AC control box and the low-voltage DC control box; the high-voltage AC control box is used to divide the control signal into multiple control signals; the low-voltage DC control box is used to divide the control signal into multiple control signals; under the synchronization action of the synchronous control box, the high-voltage AC control box sends the multiple control signals to each high-voltage AC module control board respectively, and the low-voltage DC control box sends the multiple control signals to each low-voltage DC module control board; each high-voltage AC module control board sends the received control signal to the corresponding high-voltage AC module in the medium-voltage direct-mounted digital converter; each low-voltage DC module control board sends the received control signal to the corresponding low-voltage DC module in the medium-voltage direct-mounted digital converter, thereby realizing the control of the medium-voltage direct-mounted digital converter. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0023] Figure 1 It is an architecture diagram of a medium voltage direct-mounted digital converter system in one embodiment;
[0024] Figure 2 It is a structural schematic diagram of a medium voltage direct-mounted digital converter in one embodiment;
[0025] Figure 3 A schematic diagram of the structure of a control system in one embodiment;
[0026] Figure 4 It is a structural schematic diagram of external communication of a medium voltage direct-mounted digital converter system in one embodiment;
[0027] Figure 5 It is a schematic diagram of the structure of internal communication of a medium voltage direct-mounted digital converter system in one embodiment. DETAILED DESCRIPTION
[0028] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0029] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.
[0030] The medium voltage direct-mounted digital converter system provided in this application includes: Figure 1 The medium voltage direct-mounted digital converter and control system are shown.
[0031] Among them, the topological structure of the medium voltage direct-mounted digital converter is as follows: Figure 2 As shown, the medium voltage direct-mounted digital converter includes three parts: input stage, isolation stage and output stage. The input stage adopts a multi-stage high-voltage AC module series structure, which includes 15 parallel high-voltage AC modules corresponding to A, 15 parallel high-voltage AC modules corresponding to B and 15 parallel high-voltage AC modules corresponding to C. Each module is a rectifier H bridge, which converts AC power into DC power. The input high-voltage AC power (which can be AC10kV) is evenly distributed to each high-voltage AC module, thereby reducing the voltage borne by the switching device on each high-voltage AC module; the isolation stage converts DC power into a high-frequency square wave, which is coupled to the secondary side through a high-frequency transformer, and then the secondary sides of all modules are connected through a common high-frequency bus, and then the capacitor of the low-voltage DC module is charged through a rectifier H bridge, and finally the DC side voltage is parallelly collected to the DC bus and connected to the energy storage battery. Among them, the low-voltage DC module can be a DC750V port module.
[0032] This topology adopts a new common high-frequency bus structure. The number of high-voltage AC modules and low-voltage DC modules can be different, which has high flexibility and convenient design. Because the number of high-voltage AC modules and low-voltage DC modules can be different, the port expansion is convenient and plug-and-play can be achieved.
[0033] The control system includes: a host computer and a synchronous control box at the first level, a high-voltage AC control box and a low-voltage DC control box at the second level, and a multi-channel high-voltage AC module control board and a multi-channel low-voltage DC module control board at the third level;
[0034] The upper computer is used to send control signals to the high-voltage AC control box and the low-voltage DC control box; the high-voltage AC control box is used to divide the control signal into multiple control signals; the low-voltage DC control box is used to divide the control signal into multiple control signals; under the synchronization action of the synchronization control box, the high-voltage AC control box sends the multiple control signals to each high-voltage AC module control board respectively, and the low-voltage DC control box sends the multiple control signals to each low-voltage DC module control board; each high-voltage AC module control board sends the received control signal to the corresponding high-voltage AC module in the medium-voltage direct-mounted digital converter; each low-voltage DC module control board sends the received control signal to the corresponding low-voltage DC module in the medium-voltage direct-mounted digital converter.
[0035] Reference Figure 3 , Figure 3 The HVAC (high voltage alternating current) control box is a high voltage AC control box, and the LVDC (low voltage direct current) control box is a low voltage DC control box; if the medium voltage direct-mounted digital converter includes Figure 2 As shown in FIG. 1 , 15 high-voltage AC modules connected in parallel corresponding to A, 15 high-voltage AC modules connected in parallel corresponding to B, 15 high-voltage AC modules connected in parallel corresponding to C, and 18 low-voltage DC modules are shown in FIG. 1 . The control system includes: 15 HVAC module control boards corresponding to A (referred to as A-phase 1#-15# HVAC module control boards), 15 HVAC module control boards corresponding to B (referred to as B-phase 1#-15# HVAC module control boards), 15 HVAC module control boards corresponding to C (referred to as C-phase 1#-15# HVAC module control boards), and 18 low-voltage DC modules are shown in FIG. 1 . 5#HVAC module control board), 18 LVDC module control boards (recorded as 1#-18#LVDC module control boards); among them, the 15 HVAC module control boards corresponding to A are respectively connected to the 15 high-voltage AC modules corresponding to A, the 15 HVAC module control boards corresponding to B are respectively connected to the 15 high-voltage AC modules corresponding to B, the 15 HVAC module control boards corresponding to C are respectively connected to the 15 high-voltage AC modules corresponding to C, and the 18 LVDC module control boards are respectively connected to the 18 low-voltage DC modules.
[0036] The host computer sends control signals to the HVAC control box and the LVDC control box. The HVAC control box divides the control signals into 15 control signals for phase A, 15 control signals for phase B, and 15 control signals for phase C. The LVDC control box divides the control signals into 18 control signals.
[0037] The synchronous control box HVAC control box and the LVDC control box send clock signals. Under the synchronization of the clock signals, the HVAC control box and the LVDC control box send the obtained multi-channel control signals to the corresponding control boards. Specifically, the HVAC control box sends 15 control signals of phase A to 1#-15#HVAC module control boards of phase A respectively, the HVAC control box sends 15 control signals of phase B to 1#-15#HVAC module control boards of phase B respectively, the HVAC control box sends 15 control signals of phase C to 1#-15#HVAC module control boards of phase C respectively, and the LVDC control box sends 18 control signals to 18 LVDC module control boards respectively;
[0038] Each control board sends the received control signal to the corresponding module of the medium-voltage direct-mounted digital inverter. For example, the A-phase 1#HVAC module control board sends the received control signal to the A-phase HVAC module connected to it in the medium-voltage direct-mounted digital inverter, thereby realizing the control of the medium-voltage direct-mounted digital inverter.
[0039] In one embodiment, the high-voltage AC module control board is connected to the high-voltage AC modules in the medium-voltage direct-mounted digital converter in a one-to-one correspondence.
[0040] Exemplarily, the A-phase 1#-15# HVAC module control boards are respectively connected one-to-one with the 15 HVAC modules corresponding to A in the medium-voltage direct-mounted digital inverter.
[0041] In one embodiment, the low voltage DC module control board is connected to the low voltage DC modules in the medium voltage direct-mounted digital converter in a one-to-one correspondence.
[0042] Exemplarily, 18 LVDC module control boards are connected to 18 LVDC modules in the medium voltage direct-mounted digital converter in a one-to-one correspondence.
[0043] In one embodiment, the number of high-voltage AC module control boards is consistent with the number of high-voltage AC modules; the number of low-voltage DC module control boards is consistent with the number of low-voltage DC modules.
[0044] In one of the embodiments, the protocol used for communication between the medium voltage direct-mounted digital converter and the monitoring system in the substation integrated automation system is a protocol with slow frames and large data volume.
[0045] Reference Figure 4 The substation integrated automation system is referred to as the integrated automation system, CTL1 is the HVAC control box, and CTL2 is the LVDC control box; the protocol used for communication between the medium-voltage direct-mounted digital converter and the monitoring system in the integrated automation system is a slow frame and large data volume protocol, and specifically the IEC61850 MMS communication protocol can be used.
[0046] MMS (Manufacturing Message Specification) is an application layer protocol that enables interoperability between devices from different manufacturers.
[0047] In one of the embodiments, the protocol used for communication between the medium voltage direct-mounted digital converter and the control and protection system in the substation integrated automation system is a protocol with fast frames and small data volume.
[0048] Reference Figure 4 The protocol used for communication between the medium voltage direct-mounted digital converter and the control and protection system in the integrated automatic system is a fast frame and small data volume protocol, and specifically the IEC61850 GOOSE communication protocol can be used.
[0049] IEC61850 GOOSE (generic object oriented substation event) is a mechanism for general object-oriented substation events to meet the fast message requirements of substation automation systems. GOOSE can transmit inputs (regular inputs of smart terminals, etc.), outputs (tripping, remote control, start failure, interlocking, self-test information, etc.), analog quantities with low real-time performance (ambient temperature and humidity, DC quantities), and transmit Boolean quantities, integers, floating-point types, and bit strings.
[0050] In one of the embodiments, the high voltage AC control box in the control system communicates with the voltage and current merging unit, and the low voltage DC control box communicates with the voltage and current merging unit.
[0051] Among them, the voltage and current merging unit can be recorded as a PT / CT merging unit, the high-voltage AC control box communicates with the voltage and current merging unit, and the low-voltage DC control box communicates with the voltage and current merging unit. The adopted protocol can be the IEC60044-8 communication protocol to collect the voltage signal and current signal of the PT / CT merging unit.
[0052] In one of the embodiments, the medium voltage direct-mounted digital converter communicates with the PT / CT merging unit, and the adopted protocol may be the SMV communication protocol.
[0053] The SMV (Sampled Measured Value) communication protocol is used for sampled measured values, also known as SV. It is a communication service for real-time transmission of digital sampled information. From the development history, SMV has gone through: IEC60044-7 / 8 (electronic sensor), IEC61850-9-1 (point-to-point), 9-2 (networking).
[0054] In one of the embodiments, the high-voltage AC control box and the industrial computer interact with each other through a switch, and the low-voltage DC control box and the industrial computer interact with each other through a switch.
[0055] Reference Figure 5 The medium voltage direct-mounted digital converter system may also include a switch, an industrial computer and a display, wherein the high voltage AC control box and the industrial computer interact through the switch, and the low voltage DC control box and the industrial computer interact through the switch.
[0056] In one embodiment, the protocol used for communication between the industrial computer and the high-voltage AC control box is a fast frame protocol with a small data volume, and specifically, the IEC61850 GOOSE communication protocol may be used.
[0057] In one embodiment, the protocol used for communication between the industrial computer and the low voltage DC control box is a fast frame protocol with a small data volume, and specifically, the IEC61850 GOOSE communication protocol may be used.
[0058] Among them, the industrial computer can communicate with the monitoring system in the integrated system, and the protocol used is the IEC61850 MMS communication protocol.
[0059] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.
[0060] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.
Claims
1. A medium voltage direct-mounted digital converter system, characterized in that: The system includes a medium voltage direct-mounted digital converter and a control system, wherein the control system includes: The host computer and synchronous control box at the first level, the high-voltage AC control box and low-voltage DC control box at the second level, and the multi-channel high-voltage AC module control board and multi-channel low-voltage DC module control board at the third level; The host computer is used to send control signals to the high-voltage AC control box and the low-voltage DC control box; The high voltage AC control box is used to divide the control signal into multiple control signals; The low voltage DC control box is used to divide the control signal into multiple control signals; Under the synchronization action of the synchronization control box, the high-voltage AC control box sends multiple control signals to each high-voltage AC module control board, and the low-voltage DC control box sends multiple control signals to each low-voltage DC module control board; Each high-voltage AC module control board sends the received control signal to the corresponding high-voltage AC module in the medium-voltage direct-mounted digital converter; Each low-voltage DC module control board sends the received control signal to the corresponding low-voltage DC module in the medium-voltage direct-mounted digital converter.
2. The system according to claim 1, characterized in that The high-voltage AC module control board is connected to the high-voltage AC modules in the medium-voltage direct-mounted digital converter in a one-to-one correspondence.
3. The system according to claim 1, characterized in that The low-voltage DC module control board is connected to the low-voltage DC modules in the medium-voltage direct-mounted digital converter in a one-to-one correspondence.
4. The system according to claim 1, characterized in that The high-voltage AC control box and the industrial computer interact with each other via a switch, and the low-voltage DC control box and the industrial computer interact with each other via a switch.
5. The system according to claim 4, characterized in that The protocol used for communication between the industrial computer and the high-voltage AC control box is a fast frame protocol with a small data volume.
6. The system according to claim 4, characterized in that The protocol used for communication between the industrial computer and the low-voltage DC control box is a fast frame protocol with a small data volume.
7. The system according to claim 1, characterized in that The protocol used for communication between the medium voltage direct-mounted digital converter and the monitoring system in the substation integrated automation system is a protocol with slow frames and large data volume.
8. The system according to claim 1, characterized in that The protocol used for communication between the medium voltage direct-mounted digital converter and the control and protection system in the substation integrated automation system is a protocol with fast frames and small data volume.
9. The system according to claim 1, characterized in that The high-voltage AC control box in the control system communicates with the voltage-current merging unit, and the low-voltage DC control box communicates with the voltage-current merging unit.
10. The system according to claim 1, characterized in that The number of the high-voltage AC module control boards is consistent with the number of the high-voltage AC modules; the number of the low-voltage DC module control boards is consistent with the number of the low-voltage DC modules.