Multi-strategy intelligent load management device and method

Abstract

The invention provides a multi-strategy intelligent load management device, which is based on two transformers and comprises a main control module, a sub-control module, a section switch module and an interconnection switch module, the main control module is in communication connection with the sub-control module, the interconnection switch module is connected with the main control module, and the section switch module is connected with the sub-control module. The main control module is in communication connection with the sub-control module through a Can bus, the main control module receives voltage and current values and switch states sent by the sub-control module and sends a control command to the sub-control module, and the sub-control module sends the command to a corresponding section switch. According to the invention, three-level loads of two sections of buses can be unloaded twice under the condition that the inlet wire I and the inlet wire II run separately. And when a single incoming line is provided with two sections of buses, three-level loads of the two sections of buses can be managed in a unified manner, and unloading is carried out twice.

Description

Technical Field

[0001] The present invention belongs to the field of dynamic power supply switching devices and power transmission and distribution technology, and in particular, relates to a multi-strategy intelligent load management device and method. Background Art

[0002] In some industries that have high requirements for power supply continuity, a two-incoming-one-busbar power supply is used. To prevent transformer overload, multiple strategies are needed to unload the third-level load in sections to ensure the power supply continuity of the first and second-level loads. Summary of the invention

[0003] In view of this, the purpose of the present invention is to complete automatic switching when a power failure occurs, and to perform segmented unloading of the tertiary loads during peak power consumption to ensure the power supply continuity of important loads.

[0004] In a first aspect, an embodiment of the present invention provides a strategic intelligent load management device, based on two transformers, including a main control module, a sub-control module, a section switch module, and a tie switch module, wherein the main control module is communicatively connected to the sub-control module, the tie switch module is connected to the main control module, and the section switch module is connected to the sub-control module;

[0005] The segment switch module includes a line one switch, a line two switch, and a three-level load switch, and the sub-control module switches the power supply by controlling the line one switch, the line two switch, and the three-level load switch;

[0006] The main control module includes a main control single-chip unit, a human-computer interaction unit, a fault alarm output unit, an LED display unit, a main control storage unit, a generator start-stop control unit, a main control programmable node unit, a communication unit, and an electric selection unit. The communication unit includes Modbus protocol communication and Can bus communication; the main control single-chip unit is respectively connected to the human-computer interaction unit, the fault alarm output unit, the LED display unit, the main control storage unit, the generator start-stop control unit, the main control programmable node unit, the communication unit, and the electric selection unit;

[0007] The sub-control module includes a sub-control single-chip unit, a current sampling unit, a voltage sampling unit, a sub-control programmable node unit, a sub-control storage unit, a closing and opening control unit, and a switch position unit. The sub-control single-chip unit is respectively connected to the current sampling unit, the voltage sampling unit, the sub-control programmable node unit, the sub-control storage unit, the closing and opening control unit, and the switch position unit. The sub-control single-chip unit is also provided with a Can bus interface;

[0008] The main control module is connected to the sub-control module via a Can bus communication. The main control module receives the voltage, current and switch status sent by the sub-control module and sends a control command to the sub-control module. The sub-control module sends the command to the corresponding segment switch.

[0009] Preferably, it also includes a power module, which provides working power to the entire device.

[0010] Preferably, the master control programmable node unit is configured with a supplementary unloading node for line one or line two; and the sub-control programmable node unit is configured with an additional combining and splitting control node.

[0011] Preferably, the main control storage unit stores events and user data; the sub-control storage unit stores verification values ​​of current and voltage.

[0012] Preferably, the human-computer interaction unit includes a display area and a key area; the display area uses LCD liquid crystal to display Chinese and English graphic menus, switches and all status information of power supplies; the key area is used to set various working parameters.

[0013] Preferably, the current sampling unit and the voltage sampling unit monitor, sample and calculate the line current and the incoming line voltage.

[0014] Preferably, the intelligent load management device includes two load management modes: independent unloading and joint unloading.

[0015] In a first aspect, an embodiment of the present invention provides a strategic intelligent load management method, comprising:

[0016] When the voltages of transformer 1 and transformer 2 are normal, the switches of line 1 and line 2 are closed, the tie switch is disconnected, and the two lines are powered independently. At this time, if the current of line 1 is greater than the rated capacity of transformer 1, line 1 is overloaded, and the main control module starts the delay; when the delay ends, line 1 is still overloaded, and the first section of the three-level load of line 1 is unloaded; after the unloading is completed, the current of line 1 will continue to be detected. At this time, if line 1 is still overloaded, the main control module will start the delay again. When the delay ends, line 1 is still overloaded, and the second section of the three-level load of line 1 is unloaded again; after two unloadings, line 1 is still overloaded, and the intelligent load management device sends an alarm signal; among them, if the overload of line 1 disappears during the delay period, the intelligent load management device maintains the status quo and does not take any action;

[0017] When transformer 2 fails, the main control module calculates the sum of the current current of line 1 and the current of line 2 before the fault. If the total current is less than the rated capacity of transformer 1, the intelligent load management device converts the switch of line 1, line 2 and the connecting switch from 101 to 110. If the total current is greater than the rated capacity of transformer 1, the main control module starts the delay. If the current current of line 1 decreases during the delay, making the total current less than the rated capacity of transformer 1, the intelligent load management device converts the switch of line 1, line 2 and the connecting switch from 101 to 110. If the delay ends, the calculated total current is greater than the rated capacity of transformer 1. capacity, the third-level load section 1 of line 1 and the third-level load section 1 of line 1 are unloaded at the same time, and then the line 1 switch, line 2 switch and connecting switch are converted from 101 state to 110 state; after the conversion, if the current of line 1 is greater than the rated capacity of transformer 1, line 1 is overloaded, and the main control module starts the delay again; during the delay period, the overload of line 1 disappears, and the intelligent load management device maintains the status quo and does not take any action; when the delay ends, line 1 is still overloaded, and the third-level load section 2 of line 1 and the third-level load section 2 of the faulty line are unloaded at the same time; after two unloadings, line 1 is still overloaded, and the load management device sends an alarm signal.

[0018] The embodiments of the present invention bring the following beneficial effects:

[0019] This device can complete automatic switching when power fails, that is, control the line one switch, line two switch, and contact switch to switch the power supply. It can also calculate the load of the transformer under different working conditions by monitoring the current value of line one and line two, and unload the three-level load in sections during the peak period of power consumption to ensure the safe operation of the transformer and the power supply continuity of the first and second level loads. The intelligent load management device can unload the three-level load of the two busbars twice when the incoming line one and the incoming line two are running separately. It can also unload the three-level load of the two busbars in a unified manner when a single incoming line carries two busbars.

[0020] 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.

[0021] 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

[0022] Figure 1 A system application diagram of a multi-strategy intelligent load management device provided by an embodiment of the present invention;

[0023] Figure 2 A block diagram of a main control module provided by an embodiment of the present invention;

[0024] Figure 3 A block diagram of a sub-control module provided in an embodiment of the present invention;

[0025] Figure 4 A current sampling circuit diagram in a sub-control module provided in an embodiment of the present invention;

[0026] Figure 5 A voltage sampling circuit diagram in a sub-control module provided in an embodiment of the present invention;

[0027] Figure 6 An operation diagram of independent unloading provided by an embodiment of the present invention;

[0028] Figure 7 An operation diagram of common unloading provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0029] 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.

[0030] To facilitate understanding of this embodiment, a multi-strategy intelligent load management device disclosed in Embodiment 1 of the present invention is first described in detail. Based on two transformers, such as Figure 1 As shown, it includes a main control module, a sub-control module, a segment switch module, and a connecting switch module. The main control module is communicatively connected with the sub-control module, the connecting switch module is connected with the main control module, and the segment switch module is connected with the sub-control module.

[0031] Among them, the interconnecting switch module is controlled by the main control module directly sending closing and opening commands; the main control module is responsible for the logical control of the load management device, receives the voltage and current values ​​and switch status sent by the sub-control module, and sends control commands to the sub-control module; the sub-control module is responsible for the distribution of control commands, and transmits the collected switch status, line current, and incoming line voltage to the main control module.

[0032] The segmented switch module includes a line one switch, a line two switch, and a three-level load switch. The sub-control module switches the power supply by controlling the line one switch, the line two switch, and the three-level load switch.

[0033] It also includes a power module, which provides working power to the entire device.

[0034] like Figure 2 As shown, the main control module includes a main control single-chip unit, a human-machine interaction unit, a fault alarm output unit, an LED display unit, a main control storage unit, a generator start-stop control unit, a main control programmable node unit, a communication unit, and an electric selection unit. The main control single-chip unit is respectively connected to the human-machine interaction unit, the fault alarm output unit, the LED display unit, the main control storage unit EEPROM, the generator start-stop control unit, the main control programmable node unit, the communication unit, and the electric selection unit;

[0035] Among them, the LED display unit is used to indicate the position and alarm status of the switch; the main control storage unit EEPROM stores events and user data; the alarm output unit is used to output an alarm signal when a load management device fails; the generator start and stop control unit is used to control the start and stop of the generator; the main control programmable node unit is used to be configured as a supplementary unloading node for line one or line two according to customer requirements; the power selection unit is used to select one of the two incoming power sources to supply power to the switch's electrical operation.

[0036] Furthermore, the communication unit includes Modbus protocol communication and Can bus communication, the Modbus protocol communication is used for user communication, and the Can bus communication is used for communication with the sub-control module.

[0037] Furthermore, the human-computer interaction unit includes a display area and a key area; the display area uses LCD liquid crystal to display Chinese and English graphic menus, switches and all status information of power supplies; the key area is used to set various working parameters;

[0038] In this embodiment, the key area includes a function selection key area, a function setting key area and a manual control key area. The function key area can switch between functions such as automatic switching and automatic recovery, automatic switching without automatic recovery, manual, local, and parallel conversion. The keys in the parameter setting area can set parameters such as conversion time, communication, over-voltage and under-voltage values, parallel conditions, and unloading conditions. The system has password protection, and the user must unlock the password before operating the controller. Compared with the traditional hardware logic switching circuit, the reliability is greatly improved and can completely prevent misoperation.

[0039] like Figure 3 As shown, the sub-control module includes a sub-control single-chip unit, a current sampling unit, a voltage sampling unit, a sub-control programmable node unit, a sub-control storage unit EEPROM, a closing and opening control unit, and a switch position unit; the sub-control single-chip unit is respectively connected to the current sampling unit, the voltage sampling unit, the sub-control programmable node unit, the sub-control storage unit, the closing and opening control unit, and the switch position unit;

[0040] Among them, the closing and opening control unit is used to issue closing and opening commands to control the switch action; the switch position unit is used to receive the position signals of each switch; the sub-control programmable node unit is used to be configured into additional closing and opening control nodes according to user needs; the sub-control storage unit EEPROM stores the verification values ​​of current and voltage.

[0041] Furthermore, the sub-control single-chip unit is also provided with a CAN bus interface, and the position signal, voltage value, and current value are uploaded to the main control module through the CAN bus, and the control commands and parameter setting information of the main control module are also sent to the sub-control module through the CAN bus.

[0042] Furthermore, the current sampling unit and the voltage sampling unit monitor and sample the line current and the incoming line voltage and calculate them. Specifically, Figure 4 The current sampling circuit shown in the figure converts the current signal collected by the current transformer and inputs it into the AD port of the processor, so that the processor can calculate the line current in real time. Figure 5 The voltage sampling circuit shown in the figure steps down the incoming line voltage through a transformer, and then converts the voltage signal and inputs it into the AD port of the processor, so that the processor can calculate the incoming line voltage in real time.

[0043] In the second embodiment, the device according to the first embodiment provides an independent unloading load management method, and its operation process is as follows:

[0044] Independent unloading: When the voltage of transformer 1 and transformer 2 output lines are normal, the switch of line 1 and the switch of line 2 are closed, the tie switch is disconnected, and the two lines are powered independently. Figure 6 As shown, taking line 1 as an example,

[0045] Determine whether the current current of line 1 is greater than the rated capacity of transformer 1;

[0046] If yes, it means that once the line is overloaded, the main control module will start the T1 delay; if no, the intelligent load management device maintains the status quo and does not take any action.

[0047] If the overload on line 1 disappears during the T1 delay period, the intelligent load management device maintains the status quo and does not take any action, and waits until the T1 delay period ends to determine whether the overload on line 1 disappears;

[0048] If so, the intelligent load management device will maintain the status quo and take no action; if not, the third-level load of line one will be unloaded.

[0049] After the unloading is completed, continue to detect the current of line 1 to determine whether the current current of line 1 is greater than the rated capacity of transformer 1, that is, to determine whether line 1 is still overloaded.

[0050] If yes, the main control module will start the T2 delay, if no, the intelligent load management device will maintain the status quo and take no action.

[0051] If the overload on line 1 disappears during the T2 delay period, the intelligent load management device maintains the status quo and does not take any action. It waits until the T2 delay period ends to determine whether the overload on line 1 disappears.

[0052] If so, the intelligent load management device will maintain the status quo and take no action; if not, the second-stage incoming line of the third-level load of line one will be unloaded.

[0053] After two unloadings, continue to detect the current of line 1 to determine whether the current current of line 1 is greater than the rated capacity of transformer 1, that is, to determine whether line 1 is still overloaded.

[0054] If yes, the load management device will send out an alarm signal; if no, the intelligent load management device will maintain the status quo and take no action.

[0055] Embodiment 3, according to the device described in embodiment 1, provides a common unloading load management method, and its operation process is as follows:

[0056] Taking the voltage fault of transformer 2 as an example, to ensure the continuity of power supply, the load management device will convert the line 1 switch, line 2 switch, and tie switch from 101 to 110 (1 represents the switch is closed, 0 represents the switch is open). Before the conversion, the main control module will calculate the sum of the current current of line 1 and the current of line 2 before the fault. Figure 7 As shown,

[0057] Determine whether the total current is greater than the rated capacity of transformer 1;

[0058] If yes, the main control module will start the T3 delay; if no, it means that the transformer will not be overloaded after the conversion, and the conversion switch will convert from state 101 to state 110.

[0059] During the T3 delay period, the current in line 1 decreases, making the total current less than the rated capacity of transformer 1, and the state 101 to 110 state is directly switched. When the T3 delay ends and the total current is greater than the rated capacity of transformer 1, the third-level load section 1 of line 1 and the third-level load section 1 of line 2 are unloaded at the same time, and then the transfer switch is switched from 101 to 110.

[0060] After the conversion is completed, determine whether the current current of line 1 is greater than the rated capacity of transformer 1.

[0061] If yes, it means that the line is overloaded and the main control module will start the T4 delay; if no, it will maintain the status quo and take no action.

[0062] If the overload on line 1 disappears during the T4 delay period, the status quo will be maintained without any action. If line 1 is still overloaded after the T4 delay ends, the second section of the third-level load on line 1 and the second section of the third-level load on line 2 will be unloaded simultaneously.

[0063] After two unloadings, continue to detect the current of line 1 to determine whether line 1 is still overloaded, that is, continue to determine whether the current current of line 1 is greater than the rated capacity of transformer 1.

[0064] If yes, the load management device will send out an alarm signal; if no, the status quo will be maintained without taking any action.

[0065] In this embodiment, when the incoming line 1 and the incoming line 2 are operated separately, the three-level loads of the two bus sections are unloaded twice. It is also possible to unload the three-level loads of the two bus sections uniformly when a single incoming line carries two bus sections.

[0066] 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.

[0067] 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 multi-strategy intelligent load management device based on two transformers, characterized in that: It includes a main control module, a sub-control module, a segment switch module, and a contact switch module, wherein the main control module is connected to the sub-control module for communication, the contact switch module is connected to the main control module, and the segment switch module is connected to the sub-control module; The segment switch module includes a line one switch, a line two switch, and a three-level load switch, and the sub-control module switches the power supply by controlling the line one switch, the line two switch, and the three-level load switch; The main control module includes a main control single-chip unit, a human-computer interaction unit, a fault alarm output unit, an LED display unit, a main control storage unit, a generator start-stop control unit, a main control programmable node unit, a communication unit, and an electric selection unit. The communication unit includes Modbus protocol communication and Can bus communication; the main control single-chip unit is respectively connected to the human-computer interaction unit, the fault alarm output unit, the LED display unit, the main control storage unit, the generator start-stop control unit, the main control programmable node unit, the communication unit, and the electric selection unit; The sub-control module includes a sub-control single-chip unit, a current sampling unit, a voltage sampling unit, a sub-control programmable node unit, a sub-control storage unit, a closing and opening control unit, and a switch position unit. The sub-control single-chip unit is respectively connected to the current sampling unit, the voltage sampling unit, the sub-control programmable node unit, the sub-control storage unit, the closing and opening control unit, and the switch position unit. The sub-control single-chip unit is also provided with a Can bus interface; The main control module is connected to the sub-control module via a Can bus communication. The main control module receives the voltage, current and switch status sent by the sub-control module and sends a control command to the sub-control module. The sub-control module sends the command to the corresponding segment switch.

2. The multi-strategy intelligent load management device according to claim 1, characterized in that: It also includes a power module, which provides working power to the entire device.

3. The multi-strategy intelligent load management device according to claim 1, characterized in that: include, The master control programmable node unit configures a supplementary unloading node for line one or line two; The sub-control programmable node unit is configured with additional split control nodes.

4. The multi-strategy intelligent load management device according to claim 1, characterized in that: include, The main control storage unit stores events and user data; The sub-control storage unit stores the calibration values ​​of current and voltage.

5. The multi-strategy intelligent load management device according to claim 1, characterized in that: The human-computer interaction unit includes a display area and a key area; The display area uses LCD liquid crystal to display Chinese and English graphic menus, all status information of switches and power supplies; The key area is used to set various working parameters.

6. The multi-strategy intelligent load management device according to claim 1, characterized in that: The current sampling unit and the voltage sampling unit monitor, sample and calculate the line current and the incoming line voltage.

7. The multi-strategy intelligent load management device according to claim 1, characterized in that: The intelligent load management device includes two load management modes: independent unloading and common unloading.

8. The intelligent load management method based on the multi-strategy intelligent load management device according to any one of claims 1 to 7 is characterized in that: When the voltages of transformer 1 and transformer 2 are normal, the switches of line 1 and line 2 are closed, the tie switch is disconnected, and the two lines are powered independently. At this time, if the current of line 1 is greater than the rated capacity of transformer 1, line 1 is overloaded, and the main control module starts the delay. When the delay ends and line 1 is still overloaded, the third-level load of line 1 is unloaded. After the unloading is completed, the current of line 1 will continue to be detected. If line 1 is still overloaded at this time, the main control module will start the delay again. When the delay ends and line 1 is still overloaded, the second-stage incoming line of the third-level load of line 1 will be unloaded again. After two unloadings, line 1 is still overloaded, and the intelligent load management device will send out an alarm signal. Among them, if the overload of line 1 disappears during the delay period, the intelligent load management device maintains the status quo and does not take any action. When transformer 2 fails, the main control module calculates the sum of the current current of line 1 and the current of line 2 before the fault. If the total current is less than the rated capacity of transformer 1, the intelligent load management device converts the switch of line 1, line 2 and the connecting switch from 101 to 110. If the total current is greater than the rated capacity of transformer 1, the main control module starts the delay. If the current current of line 1 decreases during the delay, making the total current less than the rated capacity of transformer 1, the intelligent load management device converts the switch of line 1, line 2 and the connecting switch from 101 to 110. When the delay ends, if the total current is greater than the rated capacity of transformer 1, the main control module starts the delay. If the current of line one is greater than the rated capacity of transformer one, line one overloads the first section of the third-level load and the first section of the third-level load of line one at the same time, and then the switch of line one, the switch of line two and the connecting switch are changed from 101 to 110; after the conversion, if the current of line one is greater than the rated capacity of transformer one, line one is overloaded, and the main control module starts the delay again; during the delay period, the overload of line one disappears, and the intelligent load management device maintains the status quo and does not take any action; when the delay ends, line one is still overloaded, and the third-level load second section of line one and the third-level load second section of the faulty line are unloaded at the same time; after two unloadings, line one is still overloaded, and the load management device sends an alarm signal.

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