Control system and control method of security power supply

Abstract

The invention provides a control system and a control method of a security power supply, and the system comprises a diesel generator PLC which is used for controlling the switching of a security three-power supply incoming line and carrying out the automatic switching of a working incoming line and a standby incoming line of a motor control section when the bus voltage becomes low; the diesel generator control system is in communication connection with the diesel generator PLC and is used for providing a diesel generator starting signal for the diesel generator PLC during automatic input, so that the diesel generator PLC automatically starts a diesel generator set after receiving the diesel generator starting signal; and during automatic quitting, the diesel generator control system provides a power supply recovery signal for the diesel generator PLC, so that the diesel generator PLC automatically controls the diesel generator set and the corresponding security section to be in the same period after receiving any one power supply recovery signal. The control system can improve the working stability and reliability of the diesel generating set, eliminate hidden dangers, and effectively guarantee the emergency security power supply of the set.

Description

Technical Field

[0001] This application belongs to the technical field of diesel generator control, and relates to a control system, in particular to a control system and control method for an emergency power supply. Background Art

[0002] At present, for diesel generator sets that have been in production for a long time, the electronic components of the control system have aged, and the working stability and reliability cannot be guaranteed. In addition, electronic products are updated rapidly, and important components such as PLCs and controllers in the control system of diesel generator sets may face production stoppages.

[0003] In the emergency power supply switching logic of existing diesel generator controls, there are potential safety hazards: the emergency section circuit breaker is currently controlled by DCS (Distributed Control System), and the diesel generator PLC (Programmable Logic Controller) automatically closes. When the busbar voltage is low, the working power supply and the hot standby power supply of the emergency power supply motor control cannot be automatically switched. When starting the diesel generator, it is necessary to manually disconnect the circuit breaker of the emergency power supply motor control on-site before other circuit breakers can be closed, which causes great inconvenience to operation and thus there are potential safety hazards. Summary of the Invention

[0004] This application provides a control system and control method for an emergency power supply, which is used to solve the problem of how to achieve the automatic switching of the working power supply and the hot standby power supply of the emergency power supply motor control.

[0005] In a first aspect, this application provides a control system for an emergency power supply, which is used for the switching control of relevant circuit breakers for three emergency power inlets; the system includes: a diesel generator PLC, which is used to control the switching of the three emergency power inlets and, when the busbar voltage becomes low, automatically switch the working inlet and the standby inlet of the motor control section; a diesel generator control system, which is communicatively connected to the diesel generator PLC and is used to provide a signal for starting the diesel generator for the first motor in the emergency section and a signal for starting the diesel generator for the second motor in the emergency section to the diesel generator PLC when automatically put into operation, so that the diesel generator PLC automatically starts the diesel generator set when receiving any one of the starting signals; when automatically withdrawn, the diesel generator control system provides signals for restoring power supply to the working power supply of the first motor control section in the emergency section, restoring power supply to the standby power supply of the first motor control section in the emergency section, restoring power supply to the working power supply of the second motor control section in the emergency section, and restoring power supply to the standby power supply of the second motor control section in the emergency section to the diesel generator PLC, so that the diesel generator PLC automatically controls the synchronization of the diesel generator set and the corresponding emergency section when receiving any one of the signals.

[0006] In an implementation of the first aspect, after the diesel generator set starts successfully, the diesel generator PLC automatically closes the power generation outlet circuit breaker, disconnects the main and standby power supply inlet circuit breakers of the corresponding motor control bus section, and closes the feeder circuit breaker of the corresponding motor control bus section after confirming the successful tripping of the main and standby power supply inlet circuit breakers; after the diesel generator set is synchronized with the corresponding security section successfully, the diesel generator PLC closes and restores the main and standby power supply inlet circuit breakers of the motor control bus section, and then disconnects the feeder circuit breaker of the corresponding motor control bus section.

[0007] In an implementation of the first aspect, in response to any one of the signals of the restoration of the working power supply of the first motor control section of the security section, the restoration of the standby power supply of the first motor control section of the security section, the restoration of the working power supply of the second motor control section of the security section, and the restoration of the standby power supply of the second motor control section of the security section by the diesel generator PLC resulting in a synchronization failure, the diesel generator PLC issues a synchronization failure signal.

[0008] In an implementation of the first aspect, the system further includes: an intelligent charging cabinet; the intelligent charging cabinet is communicatively connected to the diesel generator PLC, and the intelligent charging cabinet includes a touch display device configured to display charging voltage, charging current, status parameters, and charging alarm information.

[0009] In an implementation of the first aspect, the local control cabinet of the diesel generator PLC has the function of testing the grid connection of the commercial power and, on the basis of grid-connected operation, enables the adjustable load power; the controller panel of the local control cabinet displays the actual load carried by the diesel generator.

[0010] In an implementation of the first aspect, the diesel generator PLC is used to start the diesel generator when the security motor control section loses voltage; communication transmission of switch position signals, bus voltage signals, and diesel engine fault signals is maintained between the diesel generator control system and the security motor control section, so that when the diesel generator control system determines that the situation is urgent based on the switch position signal, the bus voltage signal, and the diesel engine fault signal, the diesel generator can be started remotely with one key.

[0011] In an implementation of the first aspect, the controller of the diesel generator control system has the functions of remote signaling, remote measurement, remote control, and fault recording, and the display panel of the controller of the diesel generator control system displays the operating state of the diesel engine at any time.

[0012] In an implementation of the first aspect, the controller of the diesel generator control system is used to monitor the rotational speed, frequency, voltage, current, oil pressure, and water temperature of the diesel generator; the display panel of the controller of the diesel generator control system displays the real-time monitored operation status information, historical fault information, and real-time displays engine alarms and automatic shutdown protection, which is convenient for maintenance reference.

[0013] In an implementation of the first aspect, the system further includes: an interface operation device; the interface operation device is used to present the operation status and alarm information of the security section system to the operation personnel and maintenance personnel, so that the operation personnel and maintenance personnel can understand the alarm information and handle it in a timely manner; the interface operation device uses a communication interface to communicate with the diesel generator PLC, the controller of the diesel generator control system, and the intelligent charging cabinet in real time, and displays the status of each switch in the security section system, the parameter status of the diesel generator set, the alarms and historical records of the diesel generator control system, and the parameters and alarms of the intelligent charging cabinet, so that the operation personnel can operate and the maintenance personnel can handle the faults.

[0014] In the second aspect, the present application provides a control method for a security power supply, which is used for the switching control of the relevant circuit breakers of the three security power inlets; the method includes: controlling the switching of the three security power inlets through the diesel generator PLC and automatically switching the working inlet and the standby inlet of the motor control section when the bus voltage becomes low; when automatically putting into operation, providing the diesel generator PLC with the starting signal of the first motor in the security section and the starting signal of the second motor in the security section through the diesel generator control system, so that the diesel generator PLC automatically starts the diesel generator set when receiving any starting signal; when automatically withdrawing, providing the diesel generator PLC with the signals of the restoration of the power supply of the working power supply of the first motor control section in the security section, the restoration of the power supply of the standby power supply of the first motor control section in the security section, the restoration of the power supply of the working power supply of the second motor control section in the security section, and the restoration of the power supply of the standby power supply of the second motor control section in the security section through the diesel generator control system, so that the diesel generator PLC automatically controls the synchronization of the diesel generator set and the corresponding security section when receiving any one signal.

[0015] As described above, the control system and control method of the security power supply according to the present application have the following beneficial effects:

[0016] This application can achieve the logical automatic switching of the three power inlets of the security power supply (Security ESS MCC113, Security ESS MCC123, and Diesel Generator ESSPC) within the PLC of the diesel generator, and when the busbar voltage is low, it can achieve the automatic switching function between the working inlet and the standby inlet on the Security ESS MCC (Motor Control Center) section, improving the safety, reliability, and automation level during the switching process. This application reforms the control system of the diesel generator set to improve the working stability and reliability of the diesel generator set, eliminate potential hazards, and effectively guarantee the emergency security power supply of the unit. This application realizes the function that the two incoming power supplies of the Security MCC113 section and the Security MCC123 section are mutually backup, and the diesel generator can quickly self-start and operate with load as the emergency power supply. Brief Description of the Drawings

[0017] Figure 1 It shows the structural schematic diagram of the control system of the security power supply described in the embodiment of this application.

[0018] Figure 2 It shows the electrical wiring diagram of the diesel generator of the control system of the security power supply described in the embodiment of this application.

[0019] Figure 3 It shows the first logic schematic diagram of the diesel generator self-start of the control system of the security power supply described in the embodiment of this application.

[0020] Figure 4 It shows the second logic schematic diagram of the diesel generator self-start of the control system of the security power supply described in the embodiment of this application.

[0021] Figure 5 It shows the third logic schematic diagram of the diesel generator self-start of the control system of the security power supply described in the embodiment of this application.

[0022] Figure 6 It shows the fourth logic schematic diagram of the diesel generator self-start of the control system of the security power supply described in the embodiment of this application.

[0023] Figure 7 It shows the principle flowchart of the control method of the security power supply described in the embodiment of this application.

[0024] Description of Component Labels

[0025] 1 Control System of Security Power Supply

[0026] 11 PLC of Diesel Generator

[0027] 12 Control System of Diesel Generator

[0028] Steps S71 - S73 Detailed Embodiment

[0029] The following describes the implementation manners of the present application through specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0030] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner. Therefore, only the components related to the present application are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The types, quantities, and proportions of the components in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0031] Next, the technical solutions in the embodiments of the present application will be described in detail with reference to the accompanying drawings in the embodiments of the present application.

[0032] Please refer to Figure 1 , which shows the structural schematic diagram of the control system of the emergency power supply described in the embodiments of the present application. As Figure 1 shown, this embodiment provides a control system for an emergency power supply, which is used for the switching control of the relevant circuit breakers of the three emergency power inlets; the system 1 includes: a diesel generator PLC 11 and a diesel generator control system 12.

[0033] The diesel generator PLC 11 is used to control the switching of the three emergency power inlets and, when the bus voltage becomes low, automatically switch the working inlet and the standby inlet of the motor control section.

[0034] The diesel generator control system 12 is communicatively connected to the diesel generator PLC 11 and is used to provide the first motor start diesel generator signal of the emergency section and the second motor start diesel generator signal of the emergency section to the diesel generator PLC 11 when automatically put into operation, so that the diesel generator PLC 11 automatically starts the diesel generator set when receiving any start diesel generator signal; when automatically withdrawn, the diesel generator control system 12 provides signals for the restoration of power supply of the working power supply of the first motor control section of the emergency section, the restoration of power supply of the standby power supply of the first motor control section of the emergency section, the restoration of power supply of the working power supply of the second motor control section of the emergency section, and the restoration of power supply of the standby power supply of the second motor control section of the emergency section to the diesel generator PLC 11, so that the diesel generator PLC 11 automatically controls the synchronization of the diesel generator set and the corresponding emergency section when receiving any one of the signals.

[0035] Please refer to Figure 2, showing the electrical wiring diagram of the diesel generator of the control system of the emergency power supply described in the embodiments of the present application.

[0036] As Figure 2 shown, the switch information in the normal operation mode of the diesel generator set is as follows:

[0037] (1) Closing state: MCC 1130 and MCC 1230 (working incoming line switches of the emergency section) are controllable. 52-0013 and 52-0015 (feeder switches from the diesel generator PC to the emergency MCC) are uncontrollable.

[0038] (2) Hot standby state: 52-0014 (outgoing line switch of the diesel generator), MCC1132 and MCC1232 (incoming line switches of the emergency section from the diesel generator), MCC 1131 and MCC1231 (standby incoming line switches of the emergency section).

[0039] Specifically, the diesel generator PLC11 is used to control the switching of the three emergency power inlets ((emergency ESS MCC113, emergency ESS MCC123, diesel generator ESS PC)) of the security and, when the bus voltage becomes low, to perform the automatic switching between ESS MCC 1130 (working power supply) and 1131 (hot standby), and between ESS MCC1231 (working power supply) and 1232 (hot standby).

[0040] Specifically, during automatic startup, the diesel generator control system DCS provides the signal to start the diesel generator for the #1 emergency MCC (the first motor in the emergency section) and the signal to start the diesel generator for the #2 emergency MCC (the second motor in the emergency section). The diesel generator PLC program control cabinet automatically starts the generator set when receiving the signal to start the diesel generator on any section of the bus. After the unit starts successfully, it automatically closes the power generation outlet circuit breaker 52-0014 and disconnects the main and standby power incoming line circuit breakers of the corresponding MCC bus section (regardless of whether the circuit breaker is in the closed state or the open state). After confirming that the main and standby power incoming line circuit breakers are successfully disconnected (the main and standby power incoming line circuit breakers provide passive status signals), it closes the corresponding feeder circuit breaker of the MCC bus section (MCC1132 or MCC1232).

[0041] Specifically, during automatic shutdown, the diesel generator control system DCS respectively provides the restoration of the working power supply for the #1 emergency MCC, the restoration of the standby power supply for the #1 emergency MCC, the restoration of the working power supply for the #2 emergency MCC, and the restoration of the standby power supply for the #2 emergency MCC. Only the first instruction is valid. When the diesel generator PLC program control cabinet receives any one of the signals, it automatically controls the unit to be synchronized with the corresponding emergency section. After successful synchronization, it closes the restored corresponding incoming line circuit breaker and then disconnects the corresponding MCC feeder circuit breaker.

[0042] In one embodiment, after the diesel generator set starts successfully, the PLC of the diesel generator automatically closes the power generation outlet circuit breaker, disconnects the main and standby power supply inlet circuit breakers of the corresponding motor control bus section, and after confirming the successful disconnection of the main and standby power supply inlet circuit breakers, closes the feeder circuit breaker of the corresponding motor control bus section.

[0043] In one embodiment, after the diesel generator set is synchronized successfully with the corresponding security section, the PLC of the diesel generator closes the main and standby power supply inlet circuit breakers of the motor control bus section to resume power supply, and then disconnects the feeder circuit breaker of the corresponding motor control bus section.

[0044] Combined with Figures 3 to 6 the content shown below, taking Security MCC123 (Security MCC113 is the same by analogy) as an example, the control logic is as follows:

[0045] When the bus of Security MCC123 loses voltage, the PLC of the diesel generator is controlled by the bus voltage measurement and control device of the security section (low voltage signal with a 1-second delay) and the switch closing position feedback to start the diesel generator set. At the same time, the current power supply switch is opened. If there is no low voltage signal in the standby power supply, the standby power supply inlet switch is closed. Within 2 seconds, if the low voltage signal of the MCC123 bus voltage measurement and control device still exists, the standby power supply inlet switch is opened. After the diesel generator starts successfully, the PLC of the diesel generator closes the diesel generator outlet switch, Switch 0014, and the Security Section 1132 inlet switch, and the diesel generator starts to supply power to the Security Section MCC123 of the unit. If the standby power supply inlet switch is closed and the low voltage signal of the MCC123 bus voltage measurement and control device disappears within 2 seconds, after 1 minute, the diesel generator enters the cold engine state and shuts down, and the Security Section MCC123 is powered by the standby power supply.

[0046] In one embodiment, in response to any one of the signals of the PLC of the diesel generator indicating that the synchronization fails when the working power supply of the first motor control section of the security section resumes power supply, the standby power supply of the first motor control section of the security section resumes power supply, the working power supply of the second motor control section of the security section resumes power supply, and the standby power supply of the second motor control section of the security section resumes power supply, the PLC of the diesel generator issues a synchronization failure signal.

[0047] Specifically, if a synchronization failure occurs during the synchronization process of the signals of the working power supply resuming power supply of the Security MCC of Unit #1, the standby power supply resuming power supply of the Security MCC of Unit #1, the working power supply resuming power supply of the Security MCC of Unit #2, and the standby power supply resuming power supply of the Security MCC of Unit #2, the diesel generator program control cabinet issues a synchronization failure signal, which does not affect the execution of other power supply resumption instructions.

[0048] In one embodiment, the system further includes: an intelligent charging cabinet; the intelligent charging cabinet is communicatively connected to the diesel generator PLC, and the intelligent charging cabinet includes a touch display device configured to display charging voltage, charging current, status parameters, and charging alarm information.

[0049] Specifically, the rated charging current of the charging module of the intelligent charging cabinet is 40A (for a parallel battery pack of 20A * 2, module configuration needs to be based on N + 1 or more. For example, for 20A modules, more than 3 units need to be configured; for 10A modules, more than 5 units need to be configured). The intelligent charging cabinet has a function of automatically switching between equalizing charge and floating charge at regular intervals, which can be set through the touch display device. The intelligent charging cabinet also has the functions of detecting the voltage and internal resistance of the storage battery, facilitating the understanding of the internal resistance of each storage battery, and has an online detection function for the storage battery.

[0050] In one embodiment, the local control cabinet of the diesel generator PLC has a function of testing the grid connection of the commercial power and, on the basis of grid-connected operation, realizes adjustable load power; the controller panel of the local control cabinet displays the actual load carried by the diesel generator. In addition, the diesel generator PLC system has a function that the short-term power failure program is not lost, an external display panel, and the panel has functions such as status viewing and event reading.

[0051] In one embodiment, the diesel generator PLC is used to start the diesel generator when the voltage of the security motor control section is lost; the DCS of the diesel generator control system maintains communication transmission of switch position signals, bus voltage signals, and diesel engine fault signals with the security motor control section, so that when the diesel generator control system determines that the situation is urgent based on the switch position signal, the bus voltage signal, and the diesel engine fault signal, the diesel generator can be remotely started with one key.

[0052] In one embodiment, the controller of the diesel generator control system has functions of remote signaling, remote measurement, remote control, and fault recording, and the display panel of the controller of the diesel generator control system displays the operating state of the diesel engine at any time.

[0053] In one embodiment, the controller of the diesel generator control system is used to monitor the speed, frequency, voltage, current, oil pressure, and water temperature of the diesel generator; the display panel of the controller of the diesel generator control system displays the real-time monitored operating state information, historical fault information, and real-time displays engine alarm and automatic shutdown protection for easy reference during maintenance. In addition, the display panel (such as a touch screen) of the controller of the diesel generator control system has an event recording function and saves at least more than 200 fault records, which is convenient for maintenance personnel to check historical records.

[0054] Specifically, the front panel buttons of the display panel of the diesel generator control system controller are used to set data for the module. It can also be set through other setting software, and the corresponding setting software needs to be provided. Digital input and digital output can be set by the user for input and output alarms. The controller is equipped with a PROFINET interface to transmit data to the interface operation device for centralized display.

[0055] In one embodiment, the system further includes: an interface operation device.

[0056] The interface operation device is used to present the operation status and alarm information of the security section system to the operating personnel and maintenance personnel, so that the operating personnel and maintenance personnel can understand the alarm information and handle it in a timely manner.

[0057] The interface operation device uses communication interfaces to communicate with the diesel generator PLC, the controller of the diesel generator control system, and the intelligent charging cabinet in real time, and displays the status of each switch in the security section system, the parameter status of the diesel generator set, the alarms and historical records of the diesel generator control system, and the parameters and alarms of the intelligent charging cabinet, so that the operating personnel can operate and the maintenance personnel can handle faults.

[0058] Combined with Figures 2 to 6 the content shown, the process of the loss-of-voltage switching test for MCC113 and MCC123 sections is as follows:

[0059] A. Loss-of-voltage switching test for MCC113 section, the automatic logic knob of MCC113 is in the "input" position

[0060] A1. 1130 trips unexpectedly and automatically switches to 1131

[0061] 1) 1130 is in the closed position, 1131 is in the open position, 1132 is in the open position, the voltage of MCC113 is normal, 0013 is in the closed position, the diesel generator PLC control panel in the 380V common section switch room is placed in the "automatic mode", and the on-site control panel of the diesel generator body is placed in the "AUTO" position;

[0062] Manually separate the upper power switch of 1130 locally, the hard-wired interlock separates the 1130 switch, the diesel generator PLC immediately closes 1131, and manually restore the closing of the upper power switch of 1130.

[0063] A2. 1131 trips unexpectedly and automatically switches to 1130

[0064] (Connected to the previous item) Manually separate the upper power switch of 1131 locally, the hard-wired interlock separates the 1131 switch, the diesel generator PLC immediately closes 1130, and manually restore the closing of the upper power switch of 1131.

[0065] A3. MCC113 is powered by 1130, and the bus low voltage automatically switches to 1131. After the switching fails, it is powered by the diesel generator

[0066] 1) When 1130 is in the closed position, 1131 is in the open position, 1132 is in the open position, the MCC113 voltage is normal, 0013 is in the closed position, the diesel generator PLC control panel in the 380V common section switch room is set to "automatic mode", and the on-site control panel of the diesel generator body is set to the "AUTO" position;

[0067] 2) Manually disconnect the primary fuse of the MCC113 bus PT. The standby MCC113 loses voltage. After a 1-second delay, the diesel generator PLC opens 1130 and then closes 1131. Within 2 seconds, the standby MCC113 loss-of-voltage signal still exists. The diesel generator PLC opens 1131 and simultaneously starts the diesel generator. After the diesel generator starts successfully, it issues a closing command for the outlet switch. After the outlet switch closes, it issues a closing command for 0014. After 0014 closes, it issues a closing command for 1132, and the standby MCC113 is powered by the diesel generator.

[0068] 3) Manually restore the primary fuse of the MCC113 bus PT. Press the "1131 switch synchronization" button on the diesel generator PLC control panel in the 380V common section switch room. The diesel generator PLC closes 1131 after synchronization. After 5 seconds, 1132 opens.

[0069] 4) Manually stop the diesel generator.

[0070] A4. The MCC113 is powered by 1131, and the bus low voltage automatically switches to 1130. After the switching fails, it is powered by the diesel generator

[0071] 1) When 1131 is in the closed position, 1130 is in the open position, 1132 is in the open position, the MCC113 voltage is normal, 0013 is in the closed position, the diesel generator PLC control panel in the 380V common section switch room is set to "automatic mode", and the on-site control panel of the diesel generator body is set to the "AUTO" position;

[0072] 2) Manually disconnect the primary fuse of the MCC113 bus PT. The standby MCC113 loses voltage. After a 1-second delay, the diesel generator PLC opens 1131 and then closes 1130. Within 2 seconds, the standby MCC113 loss-of-voltage signal still exists. The diesel generator PLC opens 1130 and simultaneously starts the diesel generator. After the diesel generator starts successfully, it issues a closing command for the outlet switch. After the outlet switch closes, it issues a closing command for 0014. After 0014 closes, it issues a closing command for 1132, and the standby MCC113 is powered by the diesel generator.

[0073] 3) Manually restore the primary fuse of the MCC113 bus PT. Press the "1130 switch synchronization" button on the diesel generator PLC control panel in the 380V common section switch room. The diesel generator PLC closes 1130 after synchronization. After 5 seconds, 1132 opens.

[0074] 4) Manually stop the diesel generator.

[0075] B. Loss of voltage switching test for MCC123 section, the automatic logic knob of MCC123 is in the "input" position

[0076] B1. 1230 trips unexpectedly and automatically switches to 1231

[0077] 1) 1230 is in the closed position, 1231 is in the open position, 1232 is in the open position, the voltage of MCC123 is normal, 0015 is in the closed position, the PLC control panel of the diesel generator in the 380V common section switch room is set to "automatic mode", and the on-site control panel of the diesel generator body is set to the "AUTO" position;

[0078] Manually separate the upper power switch of 1230 locally, the hard-wired interlock separates the 1230 switch, the diesel generator PLC immediately closes 1231, and manually restore the closing of the upper power switch of 1230.

[0079] B2. 1231 trips unexpectedly and automatically switches to 1230

[0080] (Connected to the previous item) Manually separate the upper power switch of 1231 locally, the hard-wired interlock separates the 1231 switch, the diesel generator PLC immediately closes 1230, and manually restore the closing of the upper power switch of 1231.

[0081] B3. MCC123 is powered by 1230, and the bus low voltage automatically switches to 1231. After the switching fails, it is powered by the diesel generator

[0082] 1) 1230 is in the closed position, 1231 is in the open position, 1232 is in the open position, the voltage of MCC123 is normal, 0015 is in the closed position, the PLC control panel of the diesel generator in the 380V common section switch room is set to "automatic mode", and the on-site control panel of the diesel generator body is set to the "AUTO" position;

[0083] 2) Manually pull out the primary fuse of the MCC123 bus PT. The security MCC123 loses voltage. After a 1-second delay, the diesel generator PLC separates 1230 and then closes 1231. Within 2 seconds, the loss of voltage signal of the security MCC123 still exists. The diesel generator PLC separates 1231 and simultaneously starts the diesel generator. After the diesel generator starts successfully, it issues a closing command for the outlet switch. After the outlet switch closes, it issues a closing command for 0014. After 0014 closes, it issues a closing command for 1232. The security MCC123 is powered by the diesel generator.

[0084] 3) Manually restore the primary fuse of the MCC123 bus PT. Press the "1231 switch synchronization" button on the diesel generator PLC control panel in the 380V common section switch room. The diesel generator PLC closes 1231 after synchronization. After 5 seconds, 1232 opens.

[0085] 4) Manually stop the diesel generator.

[0086] B4.MCC123 is powered by 1231. When the busbar voltage is low, it automatically switches to 1230. After the switching fails, it is powered by the diesel generator.

[0087] 1) 1231 is in the closed position, 1230 is in the open position, 1232 is in the open position, the voltage of MCC123 is normal, 0015 is in the closed position, the diesel generator PLC control panel in the 380V common section switch room is set to "automatic mode", and the on-site control panel of the diesel generator body is set to "AUTO" position;

[0088] 2) Manually pull out the primary fuse of the MCC123 busbar PT. The security MCC123 loses voltage. After a 1-second delay, the diesel generator PLC opens 1231 and then closes 1230. Within 2 seconds, the voltage loss signal of the security MCC123 still exists. The diesel generator PLC opens 1230 and starts the diesel generator at the same time. After the diesel generator starts successfully, it issues a closing command for the outlet switch. After the outlet switch closes, it issues a closing command for 0014. After 0014 closes, it issues a closing command for 1232. The security MCC123 is powered by the diesel generator.

[0089] 3) Manually restore the primary fuse of the MCC123 busbar PT. Press the "1230 switch synchronization" button on the diesel generator PLC control panel in the 380V common section switch room. The diesel generator PLC closes 1230 after synchronization. After 5 seconds, 1232 opens.

[0090] 4) Manually stop the diesel generator.

[0091] C. When both MCC113 and MCC123 lose voltage, the diesel generator starts automatically to supply power to the two sections of the security MCC. The automatic logic knob of MCC113 is in the "in" position, and the automatic logic knob of MCC123 is in the "in" position

[0092] 1) The diesel generator PLC control panel in the 380V common section switch room is set to "automatic mode", and the on-site control panel of the diesel generator body is set to "AUTO" position;

[0093] 2) 1130 is in the closed position, the upper power supply switch of 1131 is in the open position, 1131 is in the open position, 1132 is in the open position, the voltage of MCC113 is normal, and 0013 is in the closed position;

[0094] 3) 1230 is in the closed position, the upper power supply switch of 1231 is in the open position, 1231 is in the open position, 1232 is in the open position, the voltage of MCC123 is normal, and 0015 is in the closed position;

[0095] 4) Pull the primary fuses of the MCC113 bus PT and the MCC123 bus PT simultaneously. The standby MCC113 and MCC123 lose voltage simultaneously, with a 1-second delay. The diesel generator PLC starts the diesel generator. At the same time, 1130 and 1230 are separated. After the diesel generator starts successfully, a closing command for the outlet switch is issued. After the outlet switch closes, a 0014 closing command is issued. After 0014 closes, 1132 and 1232 closing commands are issued (the closing times of 1132 and 1232 are staggered by 6 seconds). The standby MCC113 and MCC123 are powered by the diesel generator, and the primary fuses of the MCC113 bus PT and the MCC123 bus PT are restored.

[0096] 5) Start the important loads of the standby MCC113 and standby MCC123, and check the load-carrying capacity of the diesel generator.

[0097] 6) The standby MCC113 is restored to power supply from 1130 through synchronization.

[0098] 7) The standby MCC123 is restored to power supply from 1230 through synchronization.

[0099] 8) Manually stop the diesel generator.

[0100] Please refer to Figure 7 for the principle flowchart showing the control method of the standby power supply described in the embodiments of the present application. As Figure 7 shown, this embodiment provides a control method for a standby power supply, which is used for the switching control of relevant circuit breakers of the three power inlets of the standby power supply; the method specifically includes the following steps:

[0101] S71, control the switching of the three power inlets of the standby power supply through the diesel generator PLC, and automatically switch the working inlet and the standby inlet of the motor control section when the bus voltage drops.

[0102] S72, when automatically putting into operation, provide the first motor start diesel generator signal of the standby section and the second motor start diesel generator signal of the standby section to the diesel generator PLC through the diesel generator control system, so that the diesel generator PLC automatically starts the diesel generator set when receiving any one of the start diesel generator signals.

[0103] S73, when automatically withdrawing, provide signals for the restoration of the working power supply of the first motor control section of the standby section, the restoration of the standby power supply of the first motor control section of the standby section, the restoration of the working power supply of the second motor control section of the standby section, and the restoration of the standby power supply of the second motor control section of the standby section to the diesel generator PLC through the diesel generator control system, so that the diesel generator PLC automatically controls the synchronization of the diesel generator set and the corresponding standby section when receiving any one of the signals.

[0104] The protection scope of the control method of the emergency power supply described in the embodiments of the present application is not limited to the execution order of the steps listed in this embodiment. Any solution achieved by adding or reducing steps of the prior art or replacing steps according to the principle of the present application is included in the protection scope of the present application.

[0105] The control system of the emergency power supply described in the embodiments of the present application can implement the control method of the emergency power supply described in the present application. However, the implementation device of the control method of the emergency power supply described in the present application includes but is not limited to the structure of the control system of the emergency power supply listed in this embodiment. Any structural deformation and replacement of the prior art made according to the principle of the present application are included in the protection scope of the present application.

[0106] In several embodiments provided by the present application, it should be understood that the disclosed system, device or method can be implemented in other ways. For example, the system embodiments described above are only illustrative. For example, the division of modules / units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules or units can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of devices or modules or units can be in electrical, mechanical or other forms.

[0107] The modules / units described as separate components may or may not be physically separated. The components displayed as modules / units may or may not be physical modules, that is, they can be located in one place or distributed to multiple network units. Some or all of the modules / units can be selected according to actual needs to achieve the purpose of the embodiments of the present application. For example, in each embodiment of the present application, the functional modules / units can be integrated in a processing module, or each module / unit can exist physically alone, or two or more modules / units can be integrated in one module / unit.

[0108] Those of ordinary skill in the art should also be further aware that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0109] The descriptions of the processes or structures corresponding to the above-mentioned respective drawings each have their own focuses. For parts not elaborated in a certain process or structure, reference may be made to the relevant descriptions of other processes or structures.

[0110] The above embodiments are only illustrative of the principles and effects of the present application and are not intended to limit the present application. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present application should still be covered by the claims of the present application.

Claims

1. A control system for an emergency power supply, characterized in that, For the switching control of the circuit breakers related to the three power inlets for security; The system includes: A diesel generator PLC, which is used to control the switching of the three power inlets for security and, when the bus voltage drops, automatically switch the working power inlet and the standby power inlet of the motor control section; A diesel generator control system, which is communicatively connected to the diesel generator PLC. When automatically put into operation, it provides the diesel generator PLC with a signal for starting the diesel generator by the first motor in the security section and a signal for starting the diesel generator by the second motor in the security section, so that the diesel generator PLC automatically starts the diesel generator set when receiving any starting diesel generator signal. When automatically withdrawn, the diesel generator control system provides the diesel generator PLC with signals for restoring power supply to the working power supply of the first motor control section in the security section, restoring power supply to the standby power supply of the first motor control section in the security section, restoring power supply to the working power supply of the second motor control section in the security section, and restoring power supply to the standby power supply of the second motor control section in the security section, so that the diesel generator PLC automatically controls the synchronization of the diesel generator set and the corresponding security section after receiving any one of the signals.

2. The system according to claim 1, wherein: After the diesel generator set starts successfully, the diesel generator PLC automatically closes the power generation outlet circuit breaker, disconnects the main and standby power inlet circuit breakers of the corresponding motor control bus section, and after confirming the successful disconnection of the main and standby power inlet circuit breakers, closes the feeder circuit breaker of the corresponding motor control bus section; After the diesel generator set is successfully synchronized with the corresponding security section, the diesel generator PLC closes the main and standby power inlet circuit breakers of the restored motor control bus section, and then disconnects the feeder circuit breaker of the corresponding motor control bus section.

3. The system according to claim 1, wherein: In response to any one of the signals for restoring power supply to the working power supply of the first motor control section in the security section, restoring power supply to the standby power supply of the first motor control section in the security section, restoring power supply to the working power supply of the second motor control section in the security section, and restoring power supply to the standby power supply of the second motor control section in the security section resulting in synchronization failure according to the diesel generator PLC, the diesel generator PLC issues a synchronization failure signal.

4. The system according to claim 1, characterized in that, The system further includes: an intelligent charging cabinet; The intelligent charging cabinet is communicatively connected to the diesel generator PLC. The intelligent charging cabinet includes a touch display device, which is configured to display charging voltage, charging current, status parameters, and charging alarm information.

5. The system according to claim 1, wherein: The local control cabinet of the diesel generator PLC has a function of testing grid connection with the commercial power and, on the basis of grid-connected operation, realizes adjustable load power; The controller panel of the local control cabinet displays the actual load carried by the diesel generator.

6. The system according to claim 1, wherein: The diesel generator PLC is used to start the diesel generator when the voltage of the security motor control section is lost; The diesel generator control system maintains communication transmission of switch position signals, bus voltage signals, and diesel engine fault signals with the security motor control section, so that when the diesel generator control system determines an emergency based on the switch position signals, the bus voltage signals, and the diesel engine fault signals, it can remotely start the diesel generator with one key.

7. The system according to claim 1, wherein: The controller of the diesel generator control system has functions of remote signaling, remote measurement, remote control, and fault recording, and the display panel of the controller of the diesel generator control system displays the operating state of the diesel engine at any time.

8. The system according to claim 7, wherein: The controller of the diesel generator control system is used to monitor the diesel generator speed, frequency, voltage, current, oil pressure, and water temperature; the display panel of the controller of the diesel generator control system displays the real-time monitored operating state information, historical fault information, and real-time displays engine alarms and automatic shutdown protection for convenient maintenance reference.

9. The system according to claim 1, characterized in that The system further includes: an interface operation device; The interface operation device is used to present the operating conditions and alarm information of the security section system to the operating personnel and maintenance personnel, so that the operating personnel and maintenance personnel can understand the alarm information and handle it in a timely manner; The interface operation device uses a communication interface to communicate with the diesel generator PLC, the controller of the diesel generator control system, and the intelligent charging cabinet in real time, and displays the states of each switch of the security section system, the parameter states of the diesel generator set, the alarms and historical records of the diesel generator control system, and the parameters and alarms of the intelligent charging cabinet, so as to facilitate the operation of the operating personnel and the handling of faults by the maintenance personnel.

10. A control method for a security power supply, characterized in that, For the switching control of the relevant circuit breakers of the security three power inlets; the method includes: Controlling the switching of the security three power inlets through the diesel generator PLC and automatically switching the working inlet and the standby inlet of the motor control section when the bus voltage drops; When automatically putting into operation, providing the diesel generator PLC with the starting diesel generator signal of the first motor in the security section and the starting diesel generator signal of the second motor in the security section through the diesel generator control system, so that the diesel generator PLC automatically starts the diesel generator set when receiving any starting diesel generator signal; When automatically withdrawing, providing the diesel generator PLC with signals of the restoration of power supply to the working power supply of the first motor control section in the security section, the restoration of power supply to the standby power supply of the first motor control section in the security section, the restoration of power supply to the working power supply of the second motor control section in the security section, and the restoration of power supply to the standby power supply of the second motor control section in the security section through the diesel generator control system, so that the diesel generator PLC automatically controls the synchronization of the diesel generator set and the corresponding security section when receiving any one of the signals.

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