Control system and control method for commissioning of emergency diesel generators of nuclear power plants

Abstract

The application discloses a control system and a control method for debugging of an emergency diesel generator of a nuclear power plant, and the control system comprises a diesel generator, an analog DCS control device, an on-site control system of a diesel generator set, a medium-voltage circuit breaker, a shutdown mechanism and a plurality of hot standby devices; the analog DCS control device is integrated with control logic of process information and control systems, safety level interface control systems, process automation systems, safety automation systems and reactor protection systems in the nuclear power plant, so that when the process information and control systems, the safety level interface control systems, the process automation systems, the safety automation systems and the reactor protection systems in the nuclear power plant are unavailable, the debugging of the emergency diesel generator can still be normally carried out.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of nuclear power plant commissioning, and in particular to a control system and control method for commissioning of emergency diesel generators of a nuclear power plant. BACKGROUND

[0002] The main function of the emergency diesel generator set of a nuclear power plant is to start up in emergency when the external power supply is lost (LOOP, Loss of off-site Power) to provide emergency power supply for downstream emergency loads, to ensure that the systems related to residual heat removal and reactivity control can work normally, so that the unit can be normally shut down, and nuclear safety can be ensured.

[0003] At present, the conventional pressurized water reactor nuclear power unit used in China is equipped with 4 nuclear island 10kV diesel generator sets, i.e. LHP, LHQ, LHR and LHS systems, which respectively supply power to the emergency medium-voltage busbars LHA, LHB, LHC and LHD of the corresponding column. The configuration mode of the 4 nuclear island 10kV emergency diesel generators is shown in the following table: Figure 1

[0004] Figure 1 In the table, LGA represents the 1st column of conventional island 10kV normal distribution system (CI 10kV normal distribution system train 1), LGB represents the 2nd column of conventional island 10kV normal distribution system (CI 10kV normal distribution system train 2), LGC represents the 3rd column of conventional island 10kV normal distribution system (CI 10kV normal distribution system train 3), and LGD represents the 4th column of conventional island 10kV normal distribution system (CI 10kV normal distribution system train 4).

[0005] ​Accordingly, LHA represents 10kV emergency supplied distribution system - train 1, LHB represents 10kV emergency supplied distribution system - train 2, LHC represents 10kV emergency supplied distribution system - train 3, and LHD represents 10kV emergency supplied distribution system - train 4.

[0006] Accordingly, LHP represents 10kV Emergency Diesel Generator Train 1, LHQ represents 10kV Emergency Diesel Generator Train 2, LHR represents 10kV Emergency Diesel Generator Train 3, and LHS represents 10kV Emergency Diesel Generator Train 4.

[0007] In the prior art, the overall control architecture of the nuclear island 10kV emergency diesel generator set is as shown in Figure 2 Figure 2 Each of the nuclear island 10kV emergency diesel generator set overall control architecture in

[0008] ​The prior art needs to make all DCS systems related to the emergency diesel generator ready for use before the emergency diesel generator set debugging test is carried out, and the signal channel and control logic need to realize corresponding functions, so as to meet the test requirements of the diesel generator.

[0009] However, if the process information and control system PICS, the safety level interface control system SICS, the process automation system PAS, the safety automation system SAS and the reactor protection system RPR are not ready for use before the nuclear island 10kV diesel generator set debugging, the following signal functions related to the diesel generator set will not be available, and the affected control signals are: (1) diesel generator non-priority protection signal (to realize corresponding protection tripping function of the diesel generator), (2) control instruction (to realize corresponding control function of the diesel generator), (3) control signal of non-safety level auxiliary system of the diesel generator set (to put the diesel generator into hot standby state), (4) synchronization medium voltage circuit breaker interface signal (to feed back the tripping state and accept the tripping instruction). After these control signals are affected, the debugging of the emergency diesel generator of the nuclear power plant cannot be normally carried out.

[0010] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0011] The main purpose of the present application is to provide a control system and control method for the debugging of the emergency diesel generator of the nuclear power plant, which aims to solve the technical problem that when the process information and control system PICS, the safety level interface control system SICS, the process automation system PAS, the safety automation system SAS and the reactor protection system RPR in the nuclear power plant are not available, the four function control signals of the single test of the emergency diesel generator (EDG, Emergency Diesel Generator) are also not available, and the debugging of the emergency diesel generator cannot be normally carried out.

[0012] The present application provides a control system for the debugging of the emergency diesel generator of the nuclear power plant, which comprises a diesel generator, an analog DCS control device, a diesel generator set local control system, a medium voltage circuit breaker, a shutdown mechanism and a plurality of hot standby devices.

[0013] The diesel generator set local control system is used for acquiring a preset non-priority protection signal generated based on the working state of the diesel generator, and transmitting the preset non-priority protection signal to the analog DCS control device.

[0014] The analog DCS control device is configured to generate a protection tripping signal based on the preset non-priority protection signal, and transmit the protection tripping signal to the diesel generator set local control system, so that the diesel generator set local control system responds to the protection tripping signal and informs the shutdown mechanism to perform a shutdown operation.

[0015] The analog DCS control device is further configured to transmit a diesel generator start-stop instruction input by a user to the diesel generator set local control system.

[0016] The analog DCS control device is further configured to receive a hot standby device state signal fed back by each hot standby device, and transmit the hot standby device state signal to the diesel generator set local control system after processing.

[0017] The diesel generator set local control system is further configured to generate a function protection signal based on the hot standby device state signal, and feed back the function protection signal to a target hot standby device to protect the target hot standby device.

[0018] The analog DCS control device is further configured to acquire a medium-voltage circuit breaker opening signal of the diesel generator set local control system, generate an opening instruction after logical operation on the medium-voltage circuit breaker opening signal, and transmit the opening instruction to the medium-voltage circuit breaker to realize a tripping function.

[0019] Correspondingly, the diesel generator start-stop instruction includes at least one of an emergency start instruction, a remote start instruction, and a remote shutdown instruction.

[0020] Correspondingly, the analog DCS control device is further configured to, in response to an emergency start instruction input by a user, convert the emergency start instruction to an emergency start signal when it is detected that there is no reset signal blocking and no priority protection tripping signal blocking, and transmit the emergency start signal to the diesel generator set local control system to realize emergency start of the diesel generator.

[0021] Correspondingly, the analog DCS control device is further configured to, in response to a remote shutdown instruction input by a user, convert the remote shutdown instruction to a remote shutdown signal when it is detected that there is no reset signal blocking, and transmit the remote shutdown signal to the diesel generator set local control system to realize remote shutdown of the diesel generator.

[0022] Correspondingly, the analog DCS control device is further configured to, in response to a user input remote start instruction, convert the remote start instruction into a remote start signal when it is detected that there is no reset signal lockout, no priority protection tripping signal lockout, no remote shutdown signal, and no priority protection signal lockout, and transmit the remote start signal to the diesel generator set local control system to achieve remote start of the diesel generator.

[0023] Correspondingly, the hot standby device comprises a pre-lubrication pump, a feed water pump, a pre-heating circulating water pump, and a pre-heating heater.

[0024] The analog DCS control device is further configured to receive a pre-lubrication pump state signal fed back by the pre-lubrication pump corresponding switchboard, and generate a pre-lubrication pump start signal when it is detected that the pre-lubrication pump state signal represents no fault, and send the pre-lubrication pump start signal to the pre-lubrication pump corresponding switchboard to achieve protection of the pre-lubrication pump.

[0025] The analog DCS control device is further configured to receive a feed water pump state signal fed back by the feed water pump corresponding switchboard, and generate a feed water pump start signal when it is detected that the feed water pump state signal represents no fault, and send the feed water pump start signal to the feed water pump corresponding switchboard to achieve protection of the feed water pump.

[0026] The analog DCS control device is further configured to receive a pre-heating circulating water pump state signal fed back by the pre-heating circulating water pump corresponding switchboard, and generate a pre-heating circulating water pump start signal when it is detected that the pre-heating circulating water pump state signal represents no fault, and send the pre-heating circulating water pump start signal to the pre-heating circulating water pump corresponding switchboard to achieve protection of the pre-heating circulating water pump.

[0027] The analog DCS control device is further configured to receive a pre-heating heater state signal fed back by the pre-heating heater corresponding switchboard, and generate a pre-heating heater start signal when it is detected that the pre-heating heater state signal represents no fault, and send the pre-heating heater start signal to the pre-heating heater corresponding switchboard to achieve protection of the pre-heating heater.

[0028] Correspondingly, the circuit breaker signal comprises a shutdown opening signal, a manual opening signal, an over-frequency opening signal, an under-frequency opening signal, and an overload opening signal; and the opening instruction comprises a shutdown opening instruction, a manual opening instruction, an over-frequency opening instruction, an under-frequency opening instruction, and an overload opening instruction.

[0029] Correspondingly, the medium voltage circuit breaker comprises a normally synchronized medium voltage circuit breaker and a backup synchronized medium voltage circuit breaker.

[0030] Optionally, the preset non-priority protection signals include at least one of a generator reverse power protection signal, a generator negative sequence protection signal, a generator loss of field protection signal, a generator differential protection signal, a generator low voltage protection signal, a generator over voltage protection signal, an excitation over current protection signal, a generator over current protection signal, a generator rotating diode fault signal, a generator stator winding temperature signal, a high temperature water pump outlet pressure signal, an electrical overspeed signal, a low temperature water expansion tank liquid level signal, a turbocharger inlet lubricating oil pressure signal, a diesel engine bearing temperature signal, a diesel engine cooling water circuit leakage signal, a low temperature water driven pump pressure signal, an overspeed air tank pressure signal, a generator bearing temperature signal, a high temperature water expansion tank liquid level signal, a lubricating oil inlet engine temperature signal, a lubricating oil liquid level signal, a lubricating oil inlet engine pressure signal, and a high temperature water outlet engine temperature signal.

[0031] In addition, to achieve the above object, the application further provides a control method for debugging an emergency diesel generator of a nuclear power plant, which comprises the following steps:

[0032] The diesel generator set local control system acquires preset non-priority protection signals generated based on the working state of the diesel generator, and transmits the preset non-priority protection signals to the analog DCS control device;

[0033] The analog DCS control device generates a protection tripping signal based on the preset non-priority protection signals, and transmits the protection tripping signal to the diesel generator set local control system, so that the diesel generator set local control system responds to the protection tripping signal and informs the shutdown mechanism to perform a shutdown operation;

[0034] The analog DCS control device responds to a diesel generator start-stop instruction input by a user, and transmits the diesel generator start-stop instruction to the diesel generator set local control system;

[0035] The analog DCS control device receives a hot standby device state signal fed back by each hot standby device, and sends the hot standby device state signal to the diesel generator set local control system after processing;

[0036] The diesel generator set local control system generates a function protection signal according to the hot standby device state signal, and feeds back the function protection signal to a corresponding target hot standby device, so as to protect the target hot standby device;

[0037] The analog DCS control device acquires a medium voltage circuit breaker opening signal of the diesel generator set local control system, generates an opening instruction after logical operation, and sends the opening instruction to the medium voltage circuit breaker, so as to realize a tripping function.

[0038] The application provides a control system for debugging of an emergency diesel generator of a nuclear power plant, and the control system comprises an analog DCS control device, wherein control interfaces and control logics of a process information and control system (PICS), a safety level interface control system (SICS), a process automation system (PAS), a safety automation system (SAS) and a reactor protection system (RPR) are integrated in the analog DCS control device, corresponding control loops and control logics are built by using relays in the analog DCS control device, the control functions of the corresponding DCS are realized, and thus the PICS system, the SICS system, the PAS system, the SAS system and the RPR system in the nuclear power plant can still be normally debugged when the systems are unavailable. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is an electrical connection schematic diagram of four 10kV emergency diesel generators configured in a conventional pressurized water reactor nuclear power unit in the prior art;

[0040] Figure 2 It is a whole control architecture schematic diagram of a single nuclear island 10kV diesel generator unit in the prior art;

[0041] The application is based on the structure schematic diagram of the first embodiment;

[0042] Figure 3 It is a signal flow direction schematic diagram of a non-priority protection signal of a diesel generator in the prior art;

[0043] Figure 4 It is a signal flow direction schematic diagram of a control signal for controlling a diesel generator in the prior art;

[0044] Figure 5 It is a signal flow direction schematic diagram of a control signal of a non-safety level auxiliary system of a diesel generator unit in the prior art;

[0045] Figure 6 It is a signal flow direction schematic diagram of an interface signal between a diesel generator and a synchronous medium voltage circuit breaker in the prior art;

[0046] Figure 7 It is a structure schematic diagram of a control system for debugging of an emergency diesel generator of a nuclear power plant in the embodiment of the application;

[0047] Figure 8 It is a signal flow direction diagram of a DCS control device processing a non-priority protection signal in the embodiment of the application;

[0048] Figure 9 It is a logic control diagram of an analog DCS control device processing a non-priority protection signal in the embodiment of the application;

[0049] Figure 10 A signal flow direction diagram for sending control instructions by the analog DCS control device in an embodiment of the present application;

[0050] Figure 11 A logic control diagram for processing control instructions by the analog DCS control device in an embodiment of the present application;

[0051] Figure 12 A signal flow direction diagram for sending hot standby equipment state signals by the analog DCS control device in an embodiment of the present application;

[0052] Figure 13 A logic control diagram for processing function protection signals of hot standby equipment state by the analog DCS control device in an embodiment of the present application;

[0053] Figure 14 A signal flow direction diagram for processing circuit breaker signals and tripping instructions by the analog DCS control device in an embodiment of the present application;

[0054] Figure 15 A logic control diagram for processing tripping instructions by the analog DCS control device in an embodiment of the present application;

[0055] Figure 16 A flowchart of a control method for debugging an emergency diesel generator of a nuclear power plant according to an embodiment of the present application.

[0056] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0057] It should be understood that the specific embodiments described herein are merely intended to explain the present application and are not intended to limit the present application.

[0058] To solve the above technical problems, the present embodiment provides a control system for debugging an emergency diesel generator of a nuclear power plant, which refers to Figure 7 , Figure 7 A structure diagram of a control system for debugging an emergency diesel generator of a nuclear power plant according to an embodiment of the present application.

[0059] The system comprises a diesel generator, an analog DCS control device 10, a diesel generator set local control system 20, a plurality of hot standby equipment 30, a medium voltage circuit breaker 40 and a shutdown mechanism 50.

[0060] The diesel generator set local control system 20 is configured to acquire a preset non-priority protection signal generated based on the working state of the diesel generator, and transmit the preset non-priority protection signal to the analog DCS control device 10.

[0061] The analog DCS control device 10 is used for generating a protection tripping signal based on the preset non-priority protection signal, transmitting the protection tripping signal to the diesel generator set local control system 20, so that the diesel generator set local control system 20 responds to the protection tripping signal and informs the shutdown mechanism 50 to perform the shutdown operation;

[0062] The analog DCS control device 10 is also used for transmitting the diesel generator start-stop instruction input by a user to the diesel generator set local control system 20;

[0063] The analog DCS control device 10 is also used for receiving the hot standby equipment state signal fed back by each hot standby equipment 30 and sending the hot standby equipment state signal to the diesel generator set local control system 20 after processing;

[0064] The diesel generator set local control system 20 is also used for generating a function protection signal according to the hot standby equipment state signal and feeding back the function protection signal to a corresponding target hot standby equipment to realize protection of the target hot standby equipment;

[0065] The analog DCS control device is also used for acquiring the medium-voltage circuit breaker tripping signal of the diesel generator set local control system, generating a tripping instruction after logical operation of the medium-voltage circuit breaker tripping signal, and sending the tripping instruction to the medium-voltage circuit breaker 40 to realize the tripping function.

[0066] It should be noted that the analog DCS control device in the application is only used to solve the problem that the emergency diesel generator cannot normally carry out debugging due to the unavailability of the formal DCS (PICS system, SICS system, PAS system, SAS system and RPR system) in the early stage of debugging, and the control system using the application promotes the smooth progress of the single system test, the first start test and the grid-connected load test in the early stage of diesel generator debugging. After the formal DCS (PICS system, SICS system, PAS system, SAS system and RPR system) of the nuclear power unit has the available condition, all related DCS tests of the diesel generator will be re-verified.

[0067] Specifically, in an embodiment, since there are 25 non-priority protection signals of the nuclear island 10kV emergency diesel generator set in the prior art, all of which flow from the diesel generator to the standard automatic control system, the non-priority protection signals of the diesel generator are used for comprehensively protecting the diesel engine and the generator in the test mode, and the non-priority protection signals of the diesel generator are as shown in Table 1:

[0068]

[0069] In the prior art, in the normal DCS logic, the non-priority protection signal is transmitted to the safety automation system after being triggered by the diesel generator on site, the protection signal is sent to the reactor protection system after being processed by the safety automation system logic, and finally the diesel generator trip signal is triggered by the reactor protection system to realize the corresponding protection trip function, and the signal flow is as shown in Figure 3

[0070] The present embodiment improves the above technology with reference to Figure 8 , and the diesel generator set on-site control system 20 obtains a preset non-priority protection signal generated based on the working state of the diesel generator, and transmits the preset non-priority protection signal to the analog DCS control device 10.

[0071] The analog DCS control device 10 is used to generate a protection trip signal based on the preset non-priority protection signal, and transmit the protection trip signal to the diesel generator set on-site control system 20, so that the diesel generator set on-site control system 20 responds to the protection trip signal and notifies the shutdown mechanism 50 to execute the shutdown operation.

[0072] After any non-priority protection signal is triggered, the diesel generator on-site control system transmits the signal to the analog DCS control device, realizes corresponding logic processing in the device, and then the device sends a shutdown instruction signal to the diesel generator on-site control system. The on-site control system sends the shutdown instruction to the shutdown execution mechanism (hydraulic actuator + shutdown solenoid valve) to execute the shutdown action.

[0073] In the present embodiment, the logic processing process in the analog DCS control device can refer to Figure 9 When some non-priority protections are forced to be put into the analog DCS device, only 10 protection signals of generator overvoltage (Ⅱ section) protection, generator differential protection, generator low voltage protection, high temperature water pump outlet pressure low, low temperature water driven pump pressure low, overspeed air tank pressure low, electrical overspeed (3 to 1), high temperature water outlet temperature high (3 to 1), generator overcurrent protection (3 to 1) are effective. When all non-priority protections are forced to be put into the analog DCS device, 25 protection signals will be effective, and the protection trip command will be transmitted to the diesel generator on-site control system to realize the protection shutdown action.

[0074] Further, in an embodiment, the control instructions received by the diesel generator on-site control system in the prior art are as shown in Table 2:

[0075]

[0076]

[0077] ​Under normal conditions, the signal flow of the control instruction signals in Table 2 is as shown in Figure 4 Figure 4 When the process information and control system PICS, the safety level interface control system SICS, the process automation system PAS, the safety automation system SAS or the reactor protection system RPR does not have available conditions, the signals in Table 2 cannot be normally transmitted to the diesel generator on-site control system, and the diesel generator set cannot normally carry out the preliminary debugging work.

[0078] The embodiment improves the above technology, and reference is made to Figure 10 Figure 10 Fig. 1 is a schematic diagram of the signal flow of the control instruction sent by the analog DCS control device of the embodiment. The analog DCS control device will respond to the diesel generator start-stop instruction input by the user, and transmit the diesel generator start-stop instruction to the diesel generator on-site control system 20.

[0079] It can be understood that the original PICS, SICS, PAS, SAS and RPR related instruction control signals are integrated on the buttons of the analog DCS control device in the embodiment. In the field diesel generator debugging process, the corresponding pulse signal instructions are sent to the diesel generator on-site control system by the buttons to realize the corresponding functions.

[0080] In the embodiment, the logic processing process in the analog DCS control device can refer to Figure 11

[0081] The analog DCS control device 10 responds to the emergency start instruction input by the user, and when it is detected that there is no reset signal and no priority protection tripping signal blocking, the emergency start instruction is converted into an emergency start signal, and the emergency start signal is transmitted to the 10kV diesel generator set on-site control system 20 to realize the emergency start of the diesel generator.

[0082] The analog DCS control device 10 responds to the remote shutdown instruction input by the user, and when it is detected that there is no reset signal blocking, the remote shutdown instruction is converted into a remote shutdown signal, and the remote shutdown signal is transmitted to the 10kV diesel generator set on-site control system 20 to realize the remote shutdown operation of the diesel generator.

[0083] The analog DCS control device 10 responds to the remote start instruction input by the user, and when it is detected that there is no reset signal blocking, no priority protection tripping signal blocking, no remote shutdown signal, and no priority protection signal blocking, the remote start instruction is converted into a remote start signal, and the remote start signal is transmitted to the 10kV diesel generator set on-site control system 20 to realize the remote start of the diesel generator.​​​

[0084] The embodiment realizes the beneficial effect that when the PICS system, the SICS system, the PAS system, the SAS system and the RPR system in the nuclear power plant are unavailable, the remote control instruction can be normally transmitted to the diesel generator set on-site control system, and then the debugging of the emergency diesel generator can still be carried out.

[0085] Further, in an embodiment, for the prior art, the start-stop control instruction of the non-safety level auxiliary system of the diesel generator set is sent from the diesel generator on-site control cabinet to the SAS system, and then sent to the load distribution interval control room by the SAS system, and at the same time, the SAS system also sends the running, stopping and fault state feedback signals of the preheating circulating water pump, the preheating heater and the pre-lubrication pump to the diesel generator on-site control cabinet for on-site monitoring, and the signal flow diagram is as shown in Figure 5 From the above analysis, it can be known that when the SAS system is unavailable, the start-stop instruction of the hot standby equipment (the makeup water pump, the preheating circulating water pump, the preheating heater and the pre-lubrication pump) of the diesel generator cannot be normally issued, resulting in that the diesel generator cannot be put into the hot standby state. At the same time, the corresponding running, stopping and fault state cannot be normally transmitted to the diesel generator on-site control system, affecting the debugging work of the diesel generator.

[0086] The control signals of the non-safety level auxiliary system of the diesel generator set are as shown in Table 3, wherein EDG represents the emergency diesel generator:

[0087]

[0088]

[0089] The embodiment improves the above technology, and reference is made to Figure 12 , Figure 12 The signal flow direction diagram for sending the hot standby equipment state signal by the analog DCS control device of the embodiment is shown in FIG. 1;

[0090] In the embodiment, the hot standby equipment includes a pre-lubrication pump, a makeup water pump, a preheating circulating water pump and a preheating heater;

[0091] The analog DCS control device is also used for receiving the pre-lubrication pump state signal fed back by the distribution panel corresponding to the pre-lubrication pump, generating a pre-lubrication pump start signal when it is detected that the pre-lubrication pump state signal represents no fault, and sending the pre-lubrication pump start signal to the distribution panel corresponding to the pre-lubrication pump, so as to realize the protection of the pre-lubrication pump;

[0092] The analog DCS control device is further configured to receive a feed water pump state signal fed back by a switch board corresponding to the feed water pump, generate a feed water pump start signal when detecting that the feed water pump state signal represents no fault, and send the feed water pump start signal to the switch board corresponding to the feed water pump, thereby protecting the feed water pump.

[0093] The analog DCS control device is further configured to receive a preheating circulating water pump state signal fed back by a switch board corresponding to the preheating circulating water pump, generate a preheating circulating water pump start signal when detecting that the preheating circulating water pump state signal represents no fault, and send the preheating circulating water pump start signal to the switch board corresponding to the preheating circulating water pump, thereby protecting the preheating circulating water pump.

[0094] The analog DCS control device is further configured to receive a preheating heater state signal fed back by a switch board corresponding to the preheating heater, generate a preheating heater start signal when detecting that the preheating heater state signal represents no fault, and send the preheating heater start signal to the switch board corresponding to the preheating heater, thereby protecting the preheating heater.

[0095] It can be understood that the start-stop instruction signal in the diesel generator local control system covers automatic start-stop and manual start-stop, and is sent to the interval corresponding to the 400V switch board of the auxiliary load after being processed by the analog DCS control device, thereby realizing the start-stop function. Figure 12

[0096] The state feedback signals of the pre-lubrication pump, the preheating circulating water pump and the preheating heater are sent by the switch board corresponding interval, and are sent to the diesel generator local control system after being processed by the analog DCS control device, thereby realizing the state monitoring function.

[0097] In this embodiment, the logic processing process of the function protection signal of the hot standby device state of the analog DCS control device can refer to Figure 13 The analog DCS control device of this embodiment mainly realizes the locking function of the pre-lubrication pump, the preheating circulating water pump and the preheating heater start signal.

[0098] When there is no fault state signal of the pre-lubrication pump, the pre-lubrication pump start signal sent from the diesel generator local control system can be normally sent to the low-voltage switch board corresponding thereto, thereby protecting the pre-lubrication pump.

[0099] When there is no fault state signal of the preheating circulating water pump, the preheating circulating water pump start signal sent from the diesel generator local control system can be normally sent to the low-voltage switch board corresponding thereto, thereby protecting the preheating circulating water pump.

[0100] ​When there is no fault status signal in the preheater, the preheater start signal from the local control system of the diesel generator can be sent normally to its corresponding low-voltage switchboard, thereby protecting the preheater.

[0101] This embodiment enables the start / stop commands of the hot standby equipment corresponding to the emergency diesel generator to still be issued normally when the SAS system in the nuclear power plant is unavailable, so that the diesel generator can be put into hot standby state, and thus the commissioning of the emergency diesel generator can still be carried out.

[0102] Furthermore, in one embodiment, the existing diesel generator synchronizing medium-voltage circuit breaker includes two components: a normal synchronizing medium-voltage circuit breaker and a backup synchronizing medium-voltage circuit breaker. The main interface signals between the diesel generator and the synchronizing medium-voltage circuit breaker are shown in Table 4.

[0103]

[0104]

[0105] refer to Figure 6 ,Depend on Figure 6 It is known that when the SAS system and RPR system are unavailable, the tripping signal from the diesel generator to the two synchronizing medium-voltage circuit breakers cannot be sent normally, and the tripping status feedback signal of the two synchronizing medium-voltage circuit breakers cannot be sent normally to the local control cabinet of the diesel generator through the reactor protection system (RPR), affecting the grid-connected load test of the diesel generator.

[0106] This embodiment improves upon the above-mentioned technology, referring to... Figure 14 and Figure 15 The circuit breaker signals include shutdown trip signal, manual trip signal, over-frequency trip signal, under-frequency trip signal, and overload trip signal;

[0107] The shutdown trip signal, manual trip signal, over-frequency trip signal, under-frequency trip signal, and overload trip signal are generated by the local control system of the diesel generator set and sent to the simulated DCS control device. After being processed by the simulated DCS control device, a trip command is generated and sent to the medium-voltage circuit breaker to realize the tripping function. Accordingly, the trip command includes the shutdown trip command, manual trip command, over-frequency trip command, under-frequency trip command, and overload trip command.

[0108] This embodiment achieves the beneficial effect that when the SAS system and RPR system in the nuclear power plant are unavailable, the tripping signal from the emergency diesel generator to the medium-voltage circuit breaker can be sent normally, thereby enabling the commissioning of the emergency diesel generator to still be carried out normally.

[0109] Example 2

[0110] In addition, to achieve the above object, the present application further provides a control method for debugging an emergency diesel generator of a nuclear power plant. Figure 16 Figure 16 The present application is a flowchart of a control method for debugging an emergency diesel generator of a nuclear power plant. In this embodiment, the control method comprises:

[0111] Step S101: The diesel generator set local control system acquires a preset non-priority protection signal generated based on the working state of the diesel generator, and transmits the preset non-priority protection signal to the analog DCS control device.

[0112] Step S102: The analog DCS control device generates a protection tripping signal based on the preset non-priority protection signal, and transmits the protection tripping signal to the diesel generator set local control system, so that the diesel generator set local control system responds to the protection tripping signal and notifies the shutdown mechanism to perform shutdown operation.

[0113] Step S200: The analog DCS control device responds to the diesel generator start-stop instruction input by the user, and transmits the diesel generator start-stop instruction to the diesel generator set local control system.

[0114] Step S301: The analog DCS control device receives the hot standby equipment state signal fed back by each hot standby equipment, and sends the hot standby equipment state signal to the diesel generator set local control system after processing.

[0115] Step S302: The diesel generator set local control system generates a function protection signal according to the hot standby equipment state signal, and feeds back the function protection signal to the corresponding target hot standby equipment, so as to protect the target hot standby equipment.

[0116] Step S400: The analog DCS control device acquires the medium-voltage circuit breaker opening signal of the diesel generator set local control system, generates an opening instruction after logical operation, and sends the opening instruction to the medium-voltage circuit breaker to realize the tripping function.

[0117] ​It should be noted that the control method provided in the embodiment is applied to the control system, and when the PICS system, the SICS system, the PAS system, the SAS system and the RPR system in the nuclear power plant are unavailable, the four function control signals / commands of the single test of the emergency diesel generator can still be used, and the functions corresponding to the function control signals can be realized; the four function control signals are a preset non-priority protection signal, a diesel generator start-stop command (signal), a hot standby device state signal and a synchronization medium voltage circuit breaker tripping signal.

[0118] The steps S101 to S102 of the control method in the embodiment normally process the preset non-priority protection signal, and realize the shutdown protection function based on the preset non-priority protection signal.

[0119] The step S200 of the control method in the embodiment normally processes the manually input diesel generator start-stop command, realizes the function of starting the emergency diesel generator based on the manually input diesel generator start-stop command, and realizes the function of remotely starting the diesel generator.

[0120] The steps S301 to S302 of the control method in the embodiment can process the hot standby device state signals fed back by each hot standby device in the nuclear power plant, and protect the corresponding hot standby device based on the hot standby device state signals; the hot standby device in the embodiment includes a pre-lubrication pump, a feed water pump, a pre-heating circulating water pump and a pre-heating heater.

[0121] The step S400 of the control method in the embodiment can process the synchronization medium voltage circuit breaker tripping signal, and realize the corresponding tripping function based on the synchronization medium voltage circuit breaker tripping signal. The control method in the embodiment is applied to the control system in the first embodiment, and under the action of the control method in the embodiment, the four function control signals related to the PICS system, the SICS system, the PAS system, the SAS system and the RPR system can be normally processed; even if the PICS system, the SICS system, the PAS system, the SAS system and the RPR system in the nuclear power plant are unavailable, the corresponding functions can still be realized based on the above four function control signals, so that the debugging of the diesel generator can be normally performed.

[0122] It should be noted that in this document, the terms "comprise", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or systems including a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such processes, methods, articles or systems. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of another identical element in the process, method, article or system including the element.

[0123] The above-mentioned embodiment numbers of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0124] Through the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be realized by means of software and the necessary general hardware platform, of course, they can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as a ROM / RAM, a magnetic disk, or an optical disc) as described above, and includes a plurality of instructions for causing a terminal device (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in the various embodiments of the present application.

[0125] The above is only a preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent flow transformation made by using the content of the specification and drawings, or directly or indirectly applied to other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A control system for commissioning of emergency diesel generators of a nuclear power plant, characterized in that, The system comprises a diesel generator, an analog DCS control device, a diesel generator set local control system, a medium voltage circuit breaker, a shutdown mechanism and a plurality of hot standby devices; The diesel generator set local control system is configured to acquire a preset non-priority protection signal generated based on an operating state of the diesel generator, and transmit the preset non-priority protection signal to the analog DCS control device; The analog DCS control device is configured to generate a protection tripping signal based on the preset non-priority protection signal, and transmit the protection tripping signal to the diesel generator set local control system, so that the diesel generator set local control system responds to the protection tripping signal and informs the shutdown mechanism to perform a shutdown operation; The analog DCS control device is further configured to transmit a diesel generator start-stop instruction input by a user to the diesel generator set local control system; The analog DCS control device is further configured to receive a hot standby device state signal fed back by each hot standby device, and transmit the hot standby device state signal to the diesel generator set local control system after processing; The diesel generator set local control system is further configured to generate a function protection signal based on the hot standby device state signal, and feed back the function protection signal to a target hot standby device, so as to protect the target hot standby device; The analog DCS control device is further configured to acquire a medium voltage circuit breaker tripping signal of the diesel generator set local control system, generate a tripping instruction after logical operation on the medium voltage circuit breaker tripping signal, and transmit the tripping instruction to the medium voltage circuit breaker, so as to realize a tripping function.

2. The system of claim 1, wherein, The diesel generator start-stop instruction comprises at least one of an emergency start instruction, a remote start instruction and a remote shutdown instruction.

3. The system of claim 2, wherein, The analog DCS control device is further configured to, in response to an emergency start instruction input by a user, convert the emergency start instruction to an emergency start signal when it is detected that there is no reset signal blocking and there is no priority protection tripping signal blocking, and transmit the emergency start signal to the diesel generator set local control system, so as to realize emergency start of the diesel generator.

4. The system of claim 2, wherein, The analog DCS control device is further configured to, in response to a remote shutdown instruction input by a user, convert the remote shutdown instruction to a remote shutdown signal when it is detected that there is no reset signal blocking, and transmit the remote shutdown signal to the diesel generator set local control system, so as to realize remote shutdown of the diesel generator.

5. The system of claim 4, wherein, The analog DCS control device is further configured to, in response to a remote start instruction input by a user, convert the remote start instruction to a remote start signal when it is detected that there is no reset signal blocking, there is no priority protection tripping signal blocking, there is no remote shutdown signal and there is no priority protection signal blocking, and transmit the remote start signal to the diesel generator set local control system, so as to realize remote start of the diesel generator.

6. The system of claim 1, wherein, The hot standby devices comprise a pre-lubrication pump, a feed water pump, a pre-heating circulating water pump and a pre-heating heater; The analog DCS control device is further configured to receive a pre-lubrication pump state signal fed back by the pre-lubrication pump corresponding switchboard, generate a pre-lubrication pump starting signal when detecting that the pre-lubrication pump state signal represents no fault, and send the pre-lubrication pump starting signal to the pre-lubrication pump corresponding switchboard to realize protection of the pre-lubrication pump. The analog DCS control device is further configured to receive a make-up water pump state signal fed back by the make-up water pump corresponding switchboard, generate a make-up water pump starting signal when detecting that the make-up water pump state signal represents no fault, and send the make-up water pump starting signal to the make-up water pump corresponding switchboard to realize protection of the make-up water pump. The analog DCS control device is further configured to receive a pre-heating circulating water pump state signal fed back by the pre-heating circulating water pump corresponding switchboard, generate a pre-heating circulating water pump starting signal when detecting that the pre-heating circulating water pump state signal represents no fault, and send the pre-heating circulating water pump starting signal to the pre-heating circulating water pump corresponding switchboard to realize protection of the pre-heating circulating water pump. The analog DCS control device is further configured to receive a pre-heating heater state signal fed back by the pre-heating heater corresponding switchboard, generate a pre-heating heater starting signal when detecting that the pre-heating heater state signal represents no fault, and send the pre-heating heater starting signal to the pre-heating heater corresponding switchboard to realize protection of the pre-heating heater.

7. The system of claim 1, wherein, The medium voltage circuit breaker opening signals include a shutdown opening signal, a manual opening signal, an over-frequency opening signal, an under-frequency opening signal, and an overload opening signal; and the opening instructions include a shutdown opening instruction, a manual opening instruction, an over-frequency opening instruction, an under-frequency opening instruction, and an overload opening instruction.

8. The system of claim 7, wherein, The medium voltage circuit breaker includes a normally-synchronized medium voltage circuit breaker and a backup-synchronized medium voltage circuit breaker.

9. The system of any one of claims 1-8, wherein, The preset non-priority protection signals include at least one of a generator reverse power protection signal, a generator negative sequence protection signal, a generator loss-of-field protection signal, a generator differential protection signal, a generator low voltage protection signal, a generator overvoltage protection signal, an excitation overcurrent protection signal, a generator overcurrent protection signal, a generator rotating diode fault signal, a generator stator winding temperature signal, a high-temperature water pump outlet pressure signal, an electrical overspeed signal, a low-temperature water expansion tank liquid level signal, a turbocharger inlet lubricating oil pressure signal, a diesel engine bearing temperature signal, a diesel engine cooling water circuit leakage signal, a low-temperature water driven pump pressure signal, an overspeed air tank pressure signal, a generator bearing temperature signal, a high-temperature water expansion tank liquid level signal, a lubricating oil inlet engine temperature signal, a lubricating oil liquid level signal, a lubricating oil inlet engine pressure signal, and a high-temperature water outlet engine temperature signal.

10. A control method for commissioning of emergency diesel generators of nuclear power plants, characterized in that, The control method comprises: The diesel generator set on-site control system acquires preset non-priority protection signals generated based on the working state of the diesel generator, and transmits the preset non-priority protection signals to the analog DCS control device. The analog DCS control device generates a protection tripping signal based on the preset non-priority protection signal, transmits the protection tripping signal to the diesel generator set local control system, so that the diesel generator set local control system responds to the protection tripping signal and informs the shutdown mechanism to execute a shutdown operation; The analog DCS control device transmits the diesel generator start-stop instruction to the diesel generator set local control system in response to the user input diesel generator start-stop instruction; The analog DCS control device receives the hot standby equipment state signal fed back by each hot standby equipment, and sends the hot standby equipment state signal to the diesel generator set local control system after processing; The diesel generator set local control system generates a function protection signal according to the hot standby equipment state signal, and feeds back the function protection signal to the corresponding target hot standby equipment to realize protection of the target hot standby equipment; The analog DCS control device obtains the medium-voltage circuit breaker opening signal of the diesel generator set local control system, generates an opening instruction after logical operation, and sends the opening instruction to the medium-voltage circuit breaker to realize the tripping function.

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