A distributed power conversion device and method

Abstract

The present invention provides a distributed power conversion device, including a plurality of distributed units, wherein the distributed units independently control the action of each switch, and each of the distributed units is connected via a Can bus communication; each of the distributed units is provided with a single-chip microcomputer connected to a sampling circuit, a switch control circuit, and a switch position monitoring circuit respectively; the single-chip microcomputer has an external EEPROM memory and a power supply; a Can interface, a Modbus communication module, and a human-computer interaction interface are also provided. The distributed power conversion device of the present invention has a simple structure, a long distance between switches, flexible application, an unlimited number of switches, and convenient upgrading. It is applied to distribution systems with different power supply forms, and can complete automatic switching when a power supply fails. Functions can also be adjusted according to user needs to ensure the continuity of power supply to important loads.

Description

Technical Field

[0001] The present invention belongs to the technical field of automatic power supply switching devices and power transmission and distribution, and in particular relates to a distributed power supply conversion device and method. Background Art

[0002] In some industries that require high power supply continuity, it is necessary to select one power source from multiple power sources for load power supply. Therefore, it is necessary to design a simple and efficient power conversion device to meet the needs of different occasions.

[0003] Traditional power conversion devices use a centralized control architecture and must include a controller. The controller first collects voltage, current, and signals, then performs logical operations, and finally sends commands to control the switch to complete the switch. A large number of wiring harnesses are required between the switch and the controller. When the distance between the switches is greater than 20 meters, there is a risk of interference with signal collection. After being put into operation, the power distribution form cannot be adjusted because the power conversion device has a fixed function. Summary of the invention

[0004] In view of this, the purpose of the present invention is to apply to power distribution systems with different power supply forms, which can automatically switch when power failure occurs, and can also adjust functions according to customer needs to ensure the power supply continuity of important loads.

[0005] In a first aspect, an embodiment of the present invention provides a distributed power conversion device, comprising a plurality of distributed units, wherein the distributed units independently control the action of each switch, and each of the distributed units is connected to each other through a Can bus communication;

[0006] Each of the distributed units is provided with a single chip microcomputer which is respectively connected with the sampling circuit, the switch control circuit and the switch position monitoring circuit;

[0007] The single-chip microcomputer is externally provided with an EEPROM memory and a power supply, and the EEPROM memory is preset to store parameters set by the user; a Can interface, a Modbus communication module, and a human-computer interaction interface are also provided, wherein the Can interface is used for information exchange between distributed units, the Modbus communication module provides a communication channel for the user, and the human-computer interaction interface includes an LCD area, an LED area, and a key area;

[0008] Among them, the LCD area is used to display Chinese and English graphic menus, as well as switch and power status information; the LED area is used to indicate the switch position status and power status; the button area is used to select the working mode of the distributed unit and set parameters.

[0009] Preferably, the single chip microcomputer is provided with an input node and an output node, the input node is used to receive a control signal from a user; the output node is used to provide an external output signal.

[0010] Preferably, each of the distributed units includes at least one data structure for storing its own information, and the data structures of each of the distributed units are connected in series to form a linked list.

[0011] Preferably, the data structure includes a data area and an action area, the data area is used to store information of all distributed units in the form of a linked list; the action area is used to manipulate switch actions, including closing, opening, and locking.

[0012] Preferably, the information of the distributed unit includes the number and current working mode of the distributed unit, the current position and current event of the switch, the current state of the power supply, the prerequisites before the current switch action, the address of the previous data structure of the current data structure in the linked list, and the address of the next data structure.

[0013] A precondition strategy is applied in the distributed power conversion, which includes the distributed unit periodically scanning its own preconditions, obtaining the preconditions, detecting whether the distributed unit meets the preconditions, and executing the corresponding switching action if the preconditions are met; after the switching work is completed, all information of the distributed unit is sent to other distributed units to detect whether the next distributed unit meets the preconditions, and if the preconditions are met, the corresponding switching action is executed; until the switching action of the last distributed unit is completed, the power conversion device completes the conversion action.

[0014] Preferably, the preconditions include power status, positions of various switches, and operating modes.

[0015] The embodiments of the present invention bring the following beneficial effects:

[0016] Compared with traditional power conversion devices, the biggest difference between distributed power conversion devices is decentralization. There is no controller in the traditional sense. It consists of one to several distributed units. The distributed unit is installed next to the switch. Each distributed unit controls a switch. The number of switches can be arbitrarily large, breaking away from the constraints of the upper limit of the number of switches in traditional control systems. Can bus communication is used between distributed units, which has strong anti-interference ability. When the transmission rate is 40kbps, the bus length can reach 1000 meters. This distance can meet any form of power distribution system. Since there is no wiring harness connection, when the power distribution form changes, only the software upgrade of the module is required to meet the new needs, reducing the customer's later investment.

[0017] The distributed power conversion device has a simple structure, a long distance between switches, flexible application, unlimited number of switches, and convenient upgrade, and can meet the needs of different users.

[0018] Other features and advantages of the present invention will be described in the following description, and some features will become apparent from the description or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A structural diagram of a distributed power conversion device provided by an embodiment of the present invention;

[0021] Figure 2 A block diagram of the distributed unit provided in an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of a switch control module provided in an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of a switch position module provided in an embodiment of the present invention;

[0024] Figure 5 A data structure diagram provided for an embodiment of the present invention;

[0025] Figure 6 A linked list diagram provided by an embodiment of the present invention;

[0026] Figure 7 A flowchart of a precondition strategy provided by an embodiment of the present invention;

[0027] Figure 8 A diagram of a two-inlet single-bus power distribution system using a distributed power conversion device provided in an embodiment of the present invention;

[0028] Fig. 9 A flow chart of a switch-distributed unit operating according to a precondition strategy provided by an embodiment of the present invention;

[0029] Fig.10 A flow chart of the operation of the switch 2 distributed unit according to the precondition strategy provided by the embodiment of the present invention;

[0030] Fig.11 A diagram of a two-incoming-one-bus distribution system consisting of a distributed power source conversion device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] To facilitate understanding of this embodiment, a distributed power conversion device disclosed in Embodiment 1 of the present invention is first described in detail. Figure 1 As shown, it includes multiple distributed units, each of which controls the action of each switch separately, and each of the distributed units is connected through the Can bus communication; wherein, there is no upper limit on the number of distributed units, which is determined by the actual needs of the power distribution system. All distributed units work together in a unified manner according to the preset priority strategy to complete the power switching of various clock forms.

[0033] like Figure 2-Figure 4 As shown, each of the distributed units is provided with a single-chip microcomputer which is respectively connected with a sampling circuit, a switch control circuit, and a switch position monitoring circuit; the sampling circuit will step down the incoming line voltage, and then convert the voltage signal and input it into the AD port of the processor, so that the processor can calculate the incoming line voltage in real time; the switch control circuit is a control signal sent by the single-chip microcomputer which is amplified by the amplifier circuit and then drives the relay to operate, thereby completing the control of the switch operation; the switch position monitoring circuit converts the switch position signal into a 3.3V high and low level signal through an optical coupler and transmits it to the single-chip microcomputer for identifying the current position of the switch. The single-chip microcomputer is equipped with an external EEPROM memory and a power supply, and the EEPROM memory is preset to store the parameters set by the user; a Can interface, a Modbus communication module, and a human-computer interaction interface are also provided, the Can interface is used for information exchange between distributed units, the Modbus communication module provides a communication channel for users, and the human-computer interaction interface includes an LCD area, an LED area, and a key area.

[0034] The LCD area is used to display Chinese and English graphic menus, as well as switch and power status information; the LED area is used to indicate the switch position status and power status; the key area is used to select the working mode of the distributed unit, set the conversion time, communication, over-voltage and under-voltage values, priority and other parameters. All operations are password protected, and the user must unlock the password before operation, which can completely prevent misoperation.

[0035] Furthermore, the single chip microcomputer is provided with an input node and an output node, the input node is used to receive a control signal from a user and execute some specific logics as required; the output node provides an external output signal when executing certain logics as required.

[0036] like Figure 5-Figure 6 As shown, the distributed unit controls each switch action individually, and the distributed units share information such as switch position, power supply status, and working mode by means of communication. Each distributed unit works in a unified and coordinated manner according to the priority strategy. The specific control logic includes at least one data structure for storing its own information for each distributed unit, and then obtains the information of other distributed units through the Can bus, generates a data structure for each distributed unit, and connects all data structures in series to form a linked list. The data structure includes a data area and an action area. The data area is used to store the information of all distributed units in the form of a linked list; the action area is used to manipulate the switch action, including closing, opening, and locking, and the action will be different according to different switch models. The information of the distributed unit includes the number and current working mode of the distributed unit, the current position and current event of the switch, the current state of the power supply, the preconditions before the current switch action, the address of the previous data structure of the current data structure in the linked list, and the address of the next data structure.

[0037] Among them, the distributed unit numbering is not allowed to be repeated, otherwise the entire distributed power conversion device will be locked; the current power supply status includes four states: undervoltage, overvoltage, normal, and no power; if the current working mode of the distributed unit is inconsistent, the entire distributed power conversion device will be locked; the current events of the switch include four events: action failure, tripping, locking, and controllable.

[0038] like Figure 7 As shown, in order to adapt to various conversion logics, the precondition strategy is applied in the distributed power conversion. No matter how many power sources need to be monitored and how many switches need to be switched when the power conversion device is running, the switching process can be abstracted into a series of actions completed in sequence by a single switch. Specifically,

[0039] Each distributed unit periodically scans its own preconditions and obtains the preconditions. For example, when distributed unit No. 1 finds its own preconditions and meets the settings, it will control the action of switch No. 1. After the action of switch No. 1 is completed, it will send all its information to other distributed units. If all conditions at this time just meet the preconditions of distributed unit No. 2, then distributed unit No. 2 will control the action of switch No. 2. A chain reaction is generated by analogy until the last switch action is completed, and the power conversion device completes the conversion action. The preconditions are determined by the actual application, and each set of preconditions can be bound to three actions: closing, opening, and locking. Among them, the preconditions include the power status, the position of each switch, and the working mode.

[0040] Embodiment 2, a two-inlet single busbar power distribution system or a two-inlet single busbar power distribution system composed of a distributed power conversion device, taking a two-inlet single busbar power distribution system as an example, Figure 8-Figure 10As shown, if the closed state of the switch is represented as 1 and the open state is represented as 0, then the distributed power conversion device will have three states: 10, 00, and 01 when working normally.

[0041] The conversion process when the switch 1 power supply fails is as follows: the initial position is in state 10. If the switch 1 power supply fails and the switch 2 power supply is normal, and the switch 1 distributed unit precondition 1 is met, the switch 1 distributed unit will perform the action of disconnecting the switch 1 switch. After the switch 1 switch is disconnected, if the switch 2 distributed unit precondition 1 is met, the switch 2 distributed unit will perform the action of closing the switch 2 switch. That is, the distributed power conversion device completes the conversion from the switch 1 power supply to the switch 2 power supply.

[0042] The return process after the switch 1 power supply returns to normal is: the initial position is in the 01 state. If the switch 1 power supply is normal at this time and the switch 2 distributed unit precondition 2 is met, the switch 2 distributed unit will perform the action of disconnecting the switch 2 switch; after the switch 2 switch is disconnected, the switch 1 distributed unit precondition 2 is met, and the switch 1 distributed unit will perform the action of closing the switch 1 switch. That is, the distributed power conversion device completes the return from the switch 2 power supply to the switch 1 power supply.

[0043] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0044] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A distributed power conversion device, characterized in that: It includes a plurality of distributed units, each of which controls the action of each switch independently, and each of the distributed units is connected to each other through a Can bus communication; Each of the distributed units is provided with a single chip microcomputer which is respectively connected with the sampling circuit, the switch control circuit and the switch position monitoring circuit; The single-chip microcomputer is externally provided with an EEPROM memory and a power supply, and the EEPROM memory is preset to store parameters set by the user; a Can interface, a Modbus communication module, and a human-computer interaction interface are also provided, wherein the Can interface is used for information exchange between distributed units, the Modbus communication module provides a communication channel for the user, and the human-computer interaction interface includes an LCD area, an LED area, and a key area; Among them, the LCD area is used to display Chinese and English graphic menus, as well as switch and power status information; the LED area is used to indicate the switch position status and power status; the button area is used to select the working mode of the distributed unit and set parameters.

2. The distributed power conversion device according to claim 1, characterized in that: The single chip microcomputer is provided with an input node and an output node. The input node is used to receive a user's control signal; the output node is used to provide an external output signal.

3. The distributed power conversion device according to claim 1, characterized in that: Each of the distributed units includes at least one data structure for storing its own information, and the data structures of each of the distributed units are connected in series to form a linked list.

4. The distributed power conversion device according to claim 3, characterized in that: The data structure includes a data area and an action area. The data area is used to store information of all distributed units in a linked list form; the action area is used to manipulate switch actions, including closing, opening, and locking.

5. The distributed power conversion device according to claim 4, characterized in that: The information of the distributed unit includes the number and current working mode of the distributed unit, the current position and current event of the switch, the current state of the power supply, the preconditions before the current switch action, the address of the previous data structure of the current data structure in the linked list, and the address of the next data structure.

6. The distributed power conversion method according to any one of claims 1 to 5, characterized in that: A precondition strategy is applied in the distributed power conversion, which includes the distributed unit periodically scanning its own preconditions, obtaining the preconditions, detecting whether the distributed unit meets the preconditions, and executing the corresponding switching action if the preconditions are met; after the switching work is completed, all information of the distributed unit is sent to other distributed units to detect whether the next distributed unit meets the preconditions, and if the preconditions are met, the corresponding switching action is executed; until the switching action of the last distributed unit is completed, the power conversion device completes the conversion action.

7. The distributed power conversion method according to claim 6, characterized in that: The preconditions include power supply status, positions of various switches, and working modes.

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