Multi-strategy intelligent load management device and method

Abstract

The application provides a multi-strategy intelligent load management device based on two transformers, which comprises a master control module, a sub-control module, a sectional switch module and a tie switch module, the master control module is in communication connection with the sub-control module, the tie switch module is connected with the master control module, and the sectional switch module is connected with the sub-control module. The master control module and the sub-control module are in communication connection through a Can bus, the master control module receives voltage and current values and switch states sent by the sub-control module, sends control commands to the sub-control module, and the sub-control module sends the commands to corresponding sectional switches. The application can unload the three-level loads of two bus sections twice respectively under the condition that incoming line one and incoming line two are separately operated. Also, the application can manage the three-level loads of two bus sections uniformly and unload them twice when a single incoming line is used to supply two bus sections.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of power supply switching device and power transmission and distribution, in particular to a multi-strategy intelligent load management device and method. BACKGROUND

[0002] In some industries with high requirements for power supply continuity, two incoming lines and one bus tie are used for power supply. In order to prevent transformer overload, multi-strategy is used to segmentally unload the three-level load to ensure the power supply continuity of the first and second level loads. SUMMARY

[0003] Therefore, the purpose of the present application is to automatically switch when the power supply fails, and to segmentally unload the three-level load during the peak period to ensure the power supply continuity of the important load.

[0004] In the first aspect, the embodiment of the present application provides a strategy intelligent load management device based on two transformers, which comprises a master control module, a sub-control module, a segmented switch module and a tie switch module, the master control module is in communication connection with the sub-control module, the tie switch module is connected with the master control module, and the segmented switch module is connected with the sub-control module.

[0005] The segmented switch module comprises a line one switch, a line two switch and a three-level load switch, and the sub-control module controls the power supply switching by controlling the line one switch, the line two switch and the three-level load switch.

[0006] The master control module comprises a master control single-chip microcomputer unit, a man-machine interaction unit, a fault alarm output unit, an LED display unit, a master control storage unit, a generator start-stop control unit, a master control programmable node unit, a communication unit and a power selection unit, the communication unit comprises Modbus protocol communication and Can bus communication, and the master control single-chip microcomputer unit is connected with the man-machine interaction unit, the fault alarm output unit, the LED display unit, the master control storage unit, the generator start-stop control unit, the master control programmable node unit, the communication unit and the power selection unit respectively.

[0007] The sub-control module comprises a sub-control single-chip microcomputer unit, a current sampling unit, a voltage sampling unit, a sub-control programmable node unit, a sub-control storage unit, a combination and division control unit and a switch position unit, the sub-control single-chip microcomputer unit is connected with the current sampling unit, the voltage sampling unit, the sub-control programmable node unit, the sub-control storage unit, the combination and division control unit and the switch position unit respectively, and the sub-control single-chip microcomputer unit is further provided with a Can bus interface.

[0008] The main control module and the sub-control module are connected through a Can bus, the main control module receives the voltage and current values and the switch state 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 the corresponding sectional switch.

[0009] Preferably, the power supply module provides working power for the whole device.

[0010] Preferably, the main control programmable node unit configures a supplementary unloading node of line one or line two, and the sub-control programmable node unit configures an additional sectional control node.

[0011] Preferably, the main control storage unit stores event and user data, and the sub-control storage unit stores the check values of the current and voltage.

[0012] Preferably, the human-computer interaction unit comprises a display area and a key area, the display area adopts an LCD liquid crystal to display all state information of the switch and power supply, and the key area sets various working parameters.

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

[0014] Preferably, the intelligent load management device comprises two load management modes of independent unloading and common unloading.

[0015] In the first aspect, an embodiment of the present application provides a strategy intelligent load management method, comprising,

[0016] When the outgoing voltages of transformer one and transformer two are normal, the line one switch and the line two switch are closed, and the tie switch is disconnected, and two lines are independently powered, at this time, if the line one current is greater than the rated capacity of transformer one, the line one is overloaded, the main control module starts a delay, when the delay ends and the line one is still overloaded, the third load one section incoming line of the line one is unloaded, after the unloading is completed, the line one current is continuously detected, at this time, if the line one is still overloaded, the main control module starts the delay again, when the delay ends and the line one is still overloaded, the third load two section incoming line of the line one is unloaded, after two times of unloading, if the line one is still overloaded, the intelligent load management device sends an alarm signal, wherein, if the line one overload disappears during the delay, the intelligent load management device maintains the present situation without any action.

[0017] When the transformer two fails, the main control module calculates the sum of the current of line one and the current of line two before the failure of line two, if the total current is less than the rated capacity of transformer one, the intelligent load management device converts the line one switch, the line two switch and the tie switch from the state 101 to the state 110, if the total current is greater than the rated capacity of transformer one, the main control module starts the delay, if the current of line one decreases during the delay period, so that the total current is less than the rated capacity of transformer one, the intelligent load management device converts the line one switch, the line two switch and the tie switch from the state 101 to the state 110, if the delay ends and the total current is greater than the rated capacity of transformer one, the third load one of line one and the third load one of line one are unloaded at the same time, and then the line one switch, the line two switch and the tie switch are converted from the state 101 to the state 110, if the current of line one is greater than the rated capacity of transformer one after the conversion, line one is overloaded, the main control module starts the delay again, during the delay period, the overload of line one disappears, the intelligent load management device maintains the present situation without any action, when the delay ends and line one is still overloaded, the third load two of line one and the third load two of the fault line are unloaded at the same time, after two times of unloading, if line one is still overloaded, the load management device sends an alarm signal.

[0018] The embodiment of the present application has the following beneficial effects:

[0019] The device can complete automatic switching when the power fails, that is, the line one switch, the line two switch and the tie switch are controlled to switch the power. The current value of line one and the current value of line two are monitored, the load of different working conditions of the transformer is calculated, and the third load is segmented and unloaded during the power consumption peak period, so that the safe work of the transformer and the power supply continuity of the first and second loads are ensured. The intelligent load management device can unload the third load of two sections of bus bars twice under the condition that the incoming line one and the incoming line two are separately operated. The third load of two sections of bus bars can be managed and unloaded twice under the condition that a single incoming line is used to supply power to two sections of bus bars.

[0020] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application will be realized and achieved 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 application more obvious and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are referred to for detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The system application diagram of the multi-strategy intelligent load management device provided by the embodiment of the present application is shown in the figure.

[0023] Figure 2 The main control module block diagram provided for the embodiment of the present application;

[0024] Figure 3 The sub-control module block diagram provided for the embodiment of the present application;

[0025] Figure 4 The current sampling circuit diagram in the sub-control module provided for the embodiment of the present application;

[0026] Figure 5 The voltage sampling circuit diagram in the sub-control module provided for the embodiment of the present application;

[0027] Figure 6 The running diagram of independent unloading provided for the embodiment of the present application;

[0028] Figure 7 The running diagram of common unloading provided for the embodiment of the present application. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0030] For the convenience of understanding the present embodiment, first, a multi-strategy intelligent load management device disclosed in the embodiment of the present application is introduced in detail, which is based on two transformers, as shown in the figure, including a main control module, a sub-control module, a sectionalizing switch module and a tie switch module, the main control module is in communication connection with the sub-control module, the tie switch module is connected with the main control module, and the sectionalizing switch module is connected with the sub-control module. Figure 1

[0031] Among them, the tie switch module is controlled by the closing and opening commands directly sent by the main control module; the main control module is responsible for the logical control of the load management device, receives the voltage and current values and switch states 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 states, line currents and incoming line voltages to the main control module.

[0032] The sectionalizing switch module includes a line one switch, a line two switch and a three-level load switch, and the sub-control module controls the power supply switching 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 for the entire device. ​

[0034] As Figure 2 shown, the master control module includes a master control single-chip microcomputer unit, a man-machine interaction unit, a fault alarm output unit, an LED display unit, a master control storage unit, a generator start-stop control unit, a master control programmable node unit, a communication unit, and a power selection unit. The master control single-chip microcomputer unit is connected with the man-machine interaction unit, the fault alarm output unit, the LED display unit, the master control storage unit EEPROM, the generator start-stop control unit, the master control programmable node unit, the communication unit, and the power selection unit, respectively.

[0035] The LED display unit is used to indicate the position of the switch and the alarm state; the master control storage unit EEPROM stores events and user data; the alarm output unit is used to output an alarm signal when the load management device fails; the generator start-stop control unit is used to control the start and stop of the generator; the master control programmable node unit is used to configure a supplementary unloading node according to customer needs, which is line one or line two; and the power selection unit is used to select one of the two incoming line power supplies to power the electric operation of the switch.

[0036] Further, 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] Further, the man-machine interaction unit includes a display area and a key area. The display area uses an LCD liquid crystal to display Chinese and English graphical menus, all state information of the switch and the power supply. The key area sets 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 and manual recovery, manual, on-site, and parallel conversion. The keys in the parameter setting area can set parameters such as conversion time, communication, overvoltage and undervoltage values, parallel condition, and unloading condition. The system has password protection, and the user must enter the password to unlock the controller before operating it. Compared with traditional hardware logic switching circuits, the reliability is greatly improved, and it can completely prevent misoperation.

[0039] As Figure 3 shown, the sub-control module includes a sub-control single-chip microcomputer unit, a current sampling unit, a voltage sampling unit, a sub-control programmable node unit, a sub-control storage unit EEPROM, a combination and division control unit, and a switch position unit. The sub-control single-chip microcomputer unit is connected with the current sampling unit, the voltage sampling unit, the sub-control programmable node unit, the sub-control storage unit, the combination and division control unit, and the switch position unit, respectively.

[0040] The combined control unit is configured to send a combined control command to control the switch action; the switch position unit is configured to receive a position signal of each switch; the sub-control programmable node unit is configured to be configured as an additional combined control node according to user needs; and the sub-control storage unit EEPROM stores the calibration values of the current and voltage.

[0041] Further, the sub-control single-chip microcomputer unit is further provided with a Can bus interface, and the position signal, the voltage value and the current value are transmitted to the master control module through the can bus, and the control command and the parameter setting information of the master control module are also transmitted to the sub-control module through the can bus.

[0042] Further, the current sampling unit and the voltage sampling unit monitor and sample the line current and the incoming line voltage and calculate. Specifically, as shown in the current sampling circuit, Figure 4 the current signal collected by the current transformer is converted and input to the AD port of the processor, and the processor can calculate the line current in real time. As shown in the voltage sampling circuit, Figure 5 the incoming line voltage is stepped down by the transformer, and then the voltage signal is converted and input to the AD port of the processor, and the processor can calculate the incoming line voltage in real time.

[0043] Embodiment two, the device according to embodiment one provides an independent load shedding management mode, and the running process is,

[0044] When the outgoing voltages of transformer one and transformer two are normal, the line one switch and the line two switch are closed, and the tie switch is open, the two lines are independently powered. As shown in the figure, Figure 6 take line one as an example,

[0045] determine whether the current of line one is greater than the rated capacity of transformer one;

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

[0047] During the T1 delay period, the overload of line one disappears, the intelligent load management device maintains the status and does not take any action, and after the T1 delay period ends, it is determined whether the overload of line one disappears;

[0048] If yes, the intelligent load management device maintains the status and does not take any action; if no, the three-level load one incoming line of line one is unloaded.

[0049] After the unloading is completed, the current of line one is continuously detected, it is determined whether the current of line one is greater than the rated capacity of transformer one, that is, it is determined whether line one is still overloaded,

[0050] If yes, the main control module will start T2 delay, if no, the intelligent load management device will maintain the status quo without any action.

[0051] During T2 delay, if the line overload disappears, the intelligent load management device will maintain the status quo without any action, and after T2 delay ends, it will determine whether the line overload disappears,

[0052] If yes, the intelligent load management device will maintain the status quo without any action; if no, it will unload the second section of the third load of line one.

[0053] After two times of unloading, it will continue to detect the current of line one, and determine whether the current of line one is greater than the rated capacity of transformer one, i.e. whether line one is still overloaded,

[0054] If yes, the load management device will send an alarm signal; if no, the intelligent load management device will maintain the status quo without any action.

[0055] In example three, the device according to example one provides a common unloading load management mode, and the operation process is as follows,

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

[0057] determine whether the total current is greater than the rated capacity of transformer one;

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

[0059] During T3 delay, the current of line one decreases, so that the total current is less than the rated capacity of transformer one, and it will directly convert from 101 state to 110 state. When T3 delay ends, if the total current is greater than the rated capacity of transformer one, it will simultaneously unload the first section of the third load of line one and the first section of the third load of line two, and then convert the conversion switch from 101 to 110.

[0060] After conversion, it will determine whether the current of line one is greater than the rated capacity of transformer one,

[0061] If yes, it means that line one is overloaded, and the main control module will start T4 delay; if no, it will maintain the status quo without any action.

[0062] ​If the overload of line 1 disappears during the T4 delay, the system remains unchanged. If the overload of line 1 still exists after the T4 delay, the second section of the third load of line 1 and the second section of the third load of line 2 are unloaded simultaneously.

[0063] After the two times of unloading, the current of line 1 is detected again to determine whether the line 1 is still overloaded, i.e. whether the current of line 1 is greater than the rated capacity of transformer 1,

[0064] If yes, the load management device sends an alarm signal; if no, the system remains unchanged.

[0065] In this embodiment, the third loads of the two sections of bus are unloaded twice respectively when line 1 and line 2 are operated separately. The third loads of the two sections of bus can also be managed uniformly and unloaded twice when a single line is used to supply power to the two sections of bus.

[0066] It is to be understood that the terminology "including", "comprising", or any other variation thereof, is intended to cover a non-exclusive inclusion, such that processes, methods, articles, or apparatuses that comprise a list of elements are not to be construed as consisting only of those elements but can include other elements not expressly listed or inherent to such processes, methods, articles, or apparatuses.

[0067] Although the embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A multi-strategy intelligent load management device based on two transformers, characterized by, The utility model relates to an intelligent load management device, including main control module, branch control module, sectional switch module, contact switch module, main control module with branch control module communication connection, contact switch module with main control module connection, sectional switch module with branch control module connection, The sectional switch module includes line one switch, line two switch, three level load switch, and the branch control module switches power supply by controlling the line one switch, line two switch and three level load switch; The main control module includes main control singlechip unit, man-machine interaction unit, fault alarm output unit, LED display unit, main control storage unit, generator start-stop control unit, main control programmable node unit, communication unit and power selection unit, the communication unit includes Modbus protocol communication and Can bus communication, the main control singlechip unit is connected with man-machine interaction unit, fault alarm output unit, LED display unit, main control storage unit, generator start-stop control unit, main control programmable node unit, communication unit and power selection unit respectively, The branch control module includes branch control singlechip unit, current sampling unit, voltage sampling unit, branch control programmable node unit, branch control storage unit, combination and division control unit and switch position unit, the branch control singlechip unit is connected with current sampling unit, voltage sampling unit, branch control programmable node unit, branch control storage unit, combination and division control unit and switch position unit respectively, and the branch control singlechip unit is further provided with Can bus interface, The main control module is connected with the branch control module through Can bus communication, receives voltage and current value and switch state sent by the branch control module, sends control command to the branch control module, and the branch control module sends the command to corresponding sectional switch, When the transformer one and transformer two outgoing line voltage are normal, the line one switch and line two switch are closed, the contact switch is disconnected, two lines are independently powered, if the line one current is greater than the rated capacity of transformer one, the line one is overloaded, the main control module starts delay, when the delay ends, the line one is still overloaded, and the three level load one section of line one is unloaded, after unloading, the line one current is detected, if the line one is still overloaded, the main control module starts delay again, when the delay ends, the line one is still overloaded, and the three level load two section of line one is unloaded, after two times of unloading, the line one is still overloaded, and the intelligent load management device sends alarm signal, if the line one overload disappears during the delay, the intelligent load management device maintains the present situation and does not take any action. When transformer two fails, the main control module calculates the sum of line one current and line two pre-fault current, if the total current is less than the rated capacity of transformer one, the intelligent load management device changes the line one switch, line two switch and tie switch from state 101 to state 110, if the total current is greater than the rated capacity of transformer one, the main control module starts a delay; if the line one current drops during the delay period, so that the total current is less than the rated capacity of transformer one, the intelligent load management device changes the line one switch, line two switch and tie switch from state 101 to state 110; when the delay ends, if the total current is greater than the rated capacity of transformer one, the intelligent load management device simultaneously unloads the third level load one segment of line one and the third level load one segment of line two, and then changes the line one switch, line two switch and tie switch from state 101 to state 110; after the change, if the line one current is greater than the rated capacity of transformer one, line one is overloaded, the main control module starts a delay again; during the delay period, if the line one overload disappears, the intelligent load management device maintains the status quo without any action; when the delay ends, if line one is still overloaded, the intelligent load management device simultaneously unloads the third level load two segment of line one and the third level load two segment of the fault line; after two times of unloading, if line one is still overloaded, the intelligent load management device sends an alarm signal; Wherein, 1 represents the switch is closed, and 0 represents the switch is opened.

2. The multi-policy intelligent load management device of claim 1, wherein, The power module provides working power for the whole device.

3. The multi-policy intelligent load management device of claim 1, wherein, The main control module includes, The main control programmable node unit configures the supplementary unloading node of line one or line two. The sub-control programmable node unit configures an additional on-off control node.

4. The multi-policy intelligent load management device of claim 1, wherein, The main control storage unit stores event and user data. The sub-control storage unit stores the check value of current and voltage. The human-computer interaction unit includes a display area and a key area.

5. The multi-policy intelligent load management device of claim 1, wherein, The display area adopts LCD liquid crystal to display English and Chinese graphic menu, all state information of switches and power supply. The key area sets various working parameters.

6. The multi-strategy intelligent load management device according to claim 1, wherein, The current sampling unit and voltage sampling unit monitor and sample line current and incoming line voltage and calculate. The intelligent load management device includes two load management modes, independent unloading and common unloading.

7. The multi-policy intelligent load management device of claim 1, wherein, ​

Images