An electric regulating valve driving device with redundant function and control method thereof

Abstract

The invention belongs to the technical field of automatic control and measurement of electric regulating valves in nuclear power plants, and specifically relates to an electric regulating valve driving device with redundant function and a control method thereof; the device comprises: a sub-board card A, a sub-board card B, a relay, an output switching module, an X interface and an X interface; the sub-board card A and the sub-board card B are mutually redundantly arranged; the sub-board card A is respectively connected to the relay, the X interface and the X interface, and the relay is respectively connected to the X interface and the X interface; the relay is also connected to the output switching module; the sub-board card B is also respectively connected to the relay, the X interface and the X interface; the output switching module is respectively connected to the sub-board card A and the sub-board card B.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic control and measurement of electric regulating valves in nuclear power plants, and in particular relates to an electric regulating valve driving device with redundant function and a control method thereof. Background Art

[0002] At present, most of the electric control valve drive devices in domestic nuclear power plants are thyristor control devices. The main working circuit of this type of control device is mainly composed of a phase-changing circuit built by four bidirectional thyristors. The forward and reverse rotation of the electric control valve can be achieved by controlling the on and off of the thyristors. The main working circuit of this type of control device has no redundant design, which often leads to the problem that the entire control device is unavailable due to the breakdown of a single thyristor in the main circuit or the imbalance of the three-phase voltage, which affects the control of the electric control valve and is not conducive to the safe and stable operation of the nuclear power plant.

[0003] Therefore, it is necessary to design and develop an electric control valve drive device with redundant function, which can greatly reduce the failure rate of the control valve drive device, effectively improve the reliability of the equipment, and enhance the safety performance of the power station. Summary of the invention

[0004] The purpose of the present invention is to design an electric control valve drive device with redundant function and its control method to solve the technical problem that the working main circuit in the existing electric control valve drive device has no redundant function, which easily leads to the breakdown of a single thyristor in the main circuit of the electric valve drive control of the nuclear power plant or the imbalance of the three-phase voltage causing the whole control device to have a high failure rate or even unavailability.

[0005] The technical solution of the present invention:

[0006] An electric regulating valve driving device with redundant function comprises: a sub-board card A, a sub-board card B, a relay, an output switching module, an X interface and an X interface; the sub-board card A and the sub-board card B are mutually redundantly arranged; the sub-board card A is respectively connected to the relay, the X interface and the X interface, and the relay is respectively connected to the X interface and the X interface; the relay is also connected to the output switching module; the sub-board card B is also respectively connected to the relay, the X interface and the X interface; the output switching module is respectively connected to the sub-board card A and the sub-board card B;

[0007] The sub-board A also includes: a power input interface, a control and logic protection unit, a thyristor commutation circuit and a power output interface; the sub-board A is connected to the X interface through the power input interface, and the power input interface also includes L, L, L three-phase AC branches for providing L, L, L three-phase AC for the thyristor commutation circuit; the thyristor commutation circuit is connected to the power input interface and the power output interface respectively; the thyristor commutation circuit is also provided with a control and logic protection unit;

[0008] The sub-board card B also includes: a sub-board card B power input interface, a sub-board card B control and logic protection unit, a sub-board card B thyristor commutation circuit and a sub-board card B power output interface; the sub-board card B power input interface is connected to the X1 interface, and the sub-board card B power input interface includes L1, L2, L3 three-phase AC branches, which are used to provide L1, L2, L3 three-phase AC for the sub-board card B thyristor commutation circuit; the sub-board card B thyristor commutation circuit is respectively connected to the sub-board card B power input interface and the sub-board card B power output interface; the sub-board card B thyristor commutation circuit is also provided with a control and logic protection unit;

[0009] The sub-board card B and the sub-board card A are redundantly arranged, and the sub-board card B and the sub-board card A have the same structure and function.

[0010] The control and logic protection unit is connected to the X interface and is used to receive control commands and transmit them to the thyristor commutation circuit to control the thyristor on and off; the control commands include: forward, reverse and brake signals;

[0011] The control and logic protection unit also monitors the operating stability of the thyristor commutation circuit, and feeds back the forward and reverse conditions and fault signals to the output switching module, wherein the fault signals include: power supply fault signal, thyristor fault signal and state deviation alarm signal; the power output interface is connected to the relay, and the power output interface also includes: U-phase, V-phase and W-phase output terminals, which are used to provide U, V and W three-phase alternating current to the electric control valve.

[0012] The relay includes two switches K and K, each of which includes a set of normally open contacts and normally closed contacts;

[0013] The normally open contact of the K switch in the relay is connected to the U-phase output end of the power output interface on the daughter board A, the normally closed contact of the K switch is connected to the U-phase output end of the power output interface of the daughter board B, the K normally open contact is connected to the W-phase output end of the power output interface of the daughter board A, and the K normally closed contact is connected to the W-phase output of the power output interface of the daughter board B; the relay receives the control command of the output switching module to control the action of the normally open contact and the normally closed contact, thereby realizing the switching function of the outputs of the two sub-modules;

[0014] The relay is connected to the X interface to transmit the U, V, W three-phase AC power to the electric control valve; the two normally closed contacts K and K in the relay are connected to the output switching module to feedback the main and standby status of the sub-board card B and the sub-board card A.

[0015] The output switching module is connected to the X interface and is used to feed back the redundant module alarm signal;

[0016] The output switching module is connected to the relay. The output switching module diagnoses the fault conditions of the daughter board A and the daughter board B and sends commands to control the on and off of the two groups of contacts inside the relay, thereby realizing the output switching function of the daughter board A and the daughter board B; the output switching module is also used to receive the fault alarm signals of the daughter board A and the daughter board B and perform logical judgment to generate alarm signals.

[0017] The X interface is also connected to the upstream cabinet circuit breaker to receive the L, L and L three-phase AC voltage and send it to the power input interface in the daughter board A and the daughter board B; the X interface is connected to the output switching module,

[0018] When sub-board A and sub-board B fail at the same time, the ACV voltage is output through the protection terminal to the circuit breaker control circuit to disconnect the circuit breaker; the X interface is connected to the relay to receive the three-phase AC voltage of the relay U, V, W and send it to the electric regulating valve.

[0019] The X interface is also connected to the upper DCS control system to receive forward and reverse control commands and transmit the commands to the output switching module;

[0020] The X interface also receives a fault signal of one of the sub-board A or the sub-board B or a signal when both the sub-board A and the sub-board B fail from the output switching module and feeds it back to the upper DCS control system.

[0021] The thyristor commutation circuit includes: bidirectional thyristor A, bidirectional thyristor B, bidirectional thyristor C and bidirectional thyristor D; the bidirectional thyristor A and bidirectional thyristor B are a group, connected to the L alternating current branch in the power input interface of the daughter card A or the daughter card B; the bidirectional thyristor C and bidirectional thyristor D are a group, respectively connected to the L alternating current branch in the power input interface of the daughter card A or the daughter card B;

[0022] When the thyristor commutation circuit receives the forward command from the control and logic protection unit, the bidirectional thyristor B and the bidirectional thyristor C in the thyristor commutation circuit are turned on at the same time. At this time, the corresponding relationship between the three-phase power supply and the power output interface is: L-U, L-V, L-W;

[0023] When the thyristor commutation circuit receives a reversal command from the control and logic protection unit, the bidirectional thyristor A and the bidirectional thyristor D are turned on. At this time, the corresponding relationship between the three-phase power supply and the power output interface is: L-W, L-V, L-U.

[0024] The power output interface in the daughter card A is connected to the relay, and the U and W two-phase AC power are controlled on and off through the K normally open contact and the K normally open contact, and the V phase voltage is directly output to the relay.

[0025] The control method of the electric regulating valve driving device with redundant function as described above comprises the following steps:

[0026] Step 1: When the output switching module detects that the sub-board card A and the sub-board card B have fault signals, analyze whether the sub-board card is currently in the output state; the fault signals of the sub-board card A and the sub-board card B include: internal power supply fault signal, thyristor fault signal and state deviation signal;

[0027] Step 2: If the fault signal sub-board card in step 1 is the main output module, an alarm signal is issued, and at the same time, the control relay changes the contact on and off to disconnect the three-phase power output of the faulty sub-board card and connect the three-phase power output of the hot standby sub-board card to the electric control valve;

[0028] Step 3: If the fault signal sub-board card is in a non-output state in step 1, only an alarm signal is issued;

[0029] Step 4: When the output switching module detects that both daughter boards have fault signals, it transmits them to the X interface to trigger the upstream cabinet circuit breaker of the redundant module to prevent the electric regulating valve from being damaged.

[0030] Beneficial effects of the present invention:

[0031] The electric regulating valve driving device with redundant function designed by the present invention adopts a main board with two sub-boards with the same functions for redundant configuration. During normal operation, one group of the two sub-boards is in working state, and the other group is in hot standby state. A single sub-board can realize the electric regulating valve control function, which can effectively solve the problem that the failure of a single electronic component in the original regulating valve driving device board causes the entire control module to lose function. When a sub-board in working state fails, it can quickly and automatically switch to the standby sub-board output and issue a prompt alarm. The reliability of the regulating valve driving device with redundant function designed by the present invention is greatly improved; by rationally arranging the board structure of the control device, the faulty board of the control device can be replaced online to reduce the replacement cost of the driving device. In addition, the present invention has the following advantages:

[0032] 1) The present invention designs the switching logic of redundant boards, directly switches when a single daughter board fails, and designs a logic protection function when both daughter boards fail;

[0033] 2) The electric adjustment drive device has a reasonable structural design, with an output switching module installed at the front end and two redundant boards installed at the back end, which enables hot swapping of a single board and facilitates board failure inspection and replacement;

[0034] 3) The internal working circuit structure of the board of the present invention adopts a double-layer layout, and the thyristor components are close to the shell, which improves the heat dissipation effect and ensures that the temperature does not exceed the standard during long-term operation.

[0035] 4) The present invention also proposes a method for realizing self-detection of the breakdown state of the thyristor on the daughter card by using a step-down sampling circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the structure of an electric regulating valve driving device with redundant function designed for the present invention;

[0037] Figure 2 This is a schematic diagram of the internal structure of the daughter board A of the present invention;

[0038] Figure 3 This is a schematic diagram of the internal connection method of the relay described in the present invention.

[0039] Figure 4 This is a schematic diagram of the X1 interface connection method of the present invention;

[0040] Figure 5 This is a schematic diagram of the X2 interface connection method of the present invention;

[0041] Figure 6 A flow chart of the output fault alarm function of the output switching module of the electric regulating valve driving device designed for the present invention;

[0042] Figure 7 A flow chart of the output control command function of the output switching module of the electric regulating valve driving device designed for the present invention;

[0043] Among them: 1-sub-board A; 2-sub-board B; 3-output switching module; 4-relay; 5-X1 interface; 6-X2 interface; 7-power input interface; 8-control and protection unit; 9-thyristor commutation circuit; 10-power output interface; 11-sub-board B power output interface. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0045] like Figures 1 to 6 As shown, the present invention adopts a structure of one main board with two daughter boards. The two daughter boards are of fully redundant design. Only one daughter board performs output at the same time, and the daughter board that does not perform output can be replaced online separately.

[0046] The fault detection and alarm signal logic is clear. When an output daughter card fails, the output daughter card is switched. When a failure of the non-output daughter card is detected, only an alarm prompt is given. The module operation is prohibited only when both daughter cards are detected to be faulty.

[0047] The output of the two sub-boards can be self-maintained. If the faulty sub-board returns to normal or is replaced and does not need to be switched back, the current sub-board will continue to output. The two independent sub-boards have manual switching buttons, which can be manually switched from master to slave, which is convenient for self-maintenance and functional testing. Dry contacts are provided for instrumentation and control system alarms when switching between master and slave sub-boards.

[0048] Since the thyristor components are relatively large, it is difficult to design the redundancy of the thyristor commutation circuit board card without changing the size of the original control module, and the redundant daughter board may be detrimental to the heat dissipation of the components. Therefore, the present invention adopts a double-layer layout for the two daughter boards, and the thyristor components are installed close to the shell for heat dissipation. At the same time, the output switching board and the relay are stacked on top of the two daughter boards to maximize the use of the module space.

[0049] Thyristor failure is the most common failure of the daughter board. A self-detection method is designed. The step-down sampling circuit can be used to detect the breakdown state of the thyristor. When the thyristor is turned on, the voltage drop across it is very small. When the thyristor is turned off, the voltage across it is very large. The two ends of the thyristor are sampled through a RC step-down circuit and the output is isolated by an optocoupler to obtain the actual output state of the thyristor. The actual output state is then XORed with the gate level of the thyristor to determine whether the thyristor is broken down.

[0050] Embodiment: An electric regulating valve driving device with redundant function comprises: a sub-board card A1, a sub-board card B2, a relay 4, an output switching module 3, an X1 interface 5 and an X2 interface 6; the sub-board card A1 and the sub-board card B2 are redundantly arranged; the sub-board card A1 is respectively connected to the relay 4, the X1 interface 5 and the X2 interface 6, and the relay 4 is respectively connected to the X1 interface 5 and the X2 interface 6; the relay 4 is also connected to the output switching module 3; the sub-board card B2 is also respectively connected to the relay 4, the X1 interface 5 and the X2 interface 6; the output switching module 3 is respectively connected to the sub-board card A1 and the sub-board card B2;

[0051] The sub-board A1 also includes: a power input interface 7, a control and logic protection unit 8, a thyristor commutation circuit 9 and a power output interface 10; the sub-board A1 is connected to the X1 interface 5 via the power input interface 7, and the power input interface 7 also includes L1, L2, L3 three-phase AC branches, which are used to provide L1, L2, L3 three-phase AC power to the thyristor commutation circuit 9; the thyristor commutation circuit 9 is connected to the power input interface 7 and the power output interface 10 respectively; the thyristor commutation circuit 9 is also provided with a control and logic protection unit 8;

[0052] The sub-board card B2 also includes: a sub-board card B power input interface, a sub-board card B control and logic protection unit, a sub-board card B thyristor commutation circuit and a sub-board card B power output interface 11; the sub-board card B power input interface is connected to the X1 interface 5, and the sub-board card B power input interface includes L1, L2, L3 three-phase AC branches, which are used to provide L1, L2, L3 three-phase AC power for the sub-board card B thyristor commutation circuit; the sub-board card B thyristor commutation circuit is respectively connected to the sub-board card B power input interface and the sub-board card B power output interface 11; the sub-board card B thyristor commutation circuit is also provided with a control and logic protection unit;

[0053] The sub-board card B2 and the sub-board card A1 are redundantly arranged, and the sub-board card B2 has the same structure and function as the sub-board card A1.

[0054] The control and logic protection unit 8 is connected to the X2 interface 6, and is used to receive control commands and transmit them to the thyristor commutation circuit 9 to control the thyristor on and off; the control commands include: forward, reverse and brake signals;

[0055] The control and logic protection unit 8 also monitors the operating stability of the thyristor commutation circuit 9, and feeds back the forward and reverse conditions and fault signals to the output switching module 3, wherein the fault signals include: power supply fault signal, thyristor fault signal and state deviation alarm signal; the power output interface 10 is connected to the relay 4, and the power output interface 10 also includes: U-phase, V-phase and W-phase output terminals, which are used to provide U, V and W three-phase alternating current to the electric control valve.

[0056] The relay 4 includes two switches K1 and K2, each of which includes a set of normally open contacts and normally closed contacts;

[0057] The normally open contact of the K1 switch in the relay 4 is connected to the U-phase output terminal of the power output interface on the daughter board A1, the normally closed contact of the K1 switch is connected to the U-phase output terminal of the power output interface of the daughter board B2, the normally open contact of K2 is connected to the W-phase output terminal of the power output interface of the daughter board A1, and the normally closed contact of K2 is connected to the W-phase output of the power output interface of the daughter board B2; the relay receives the control command of the output switching module 3 to control the action of the normally open contact and the normally closed contact, thereby realizing the switching function of the outputs of the two sub-modules;

[0058] Relay 4 is connected to X1 interface 5 to transmit U, V, W three-phase AC power to the electric control valve; the two normally closed contacts K1 and K2 in the relay 4 are connected to the output switching module 3 to feedback the main and standby status of sub-board B2 and sub-board A1.

[0059] The output switching module 3 is connected to the X2 interface 6 and is used to feed back the redundant module alarm signal;

[0060] The output switching module 3 is connected to the relay 4. The output switching module 3 diagnoses the fault conditions of the sub-board card A1 and the sub-board card B2 and issues commands to control the on and off of the two groups of contacts inside the relay 4, thereby realizing the output switching function of the sub-board card A1 and the sub-board card B2; the output switching module 3 is also used to receive the fault alarm signals of the sub-board card A1 and the sub-board card B2 and perform logical judgment to generate alarm signals.

[0061] The X1 interface 5 is also connected to the upstream cabinet circuit breaker, and is used to receive the three-phase AC voltages of L1, L2 and L3 and send them to the power input interfaces in the sub-board A1 and the sub-board B2; the X1 interface 5 is connected to the output switching module 3,

[0062] When sub-board A1 and sub-board B2 fail at the same time, the AC380V voltage is output through the protection terminal to the circuit breaker control circuit to disconnect the circuit breaker; the X1 interface 5 is connected to the relay 4 to receive the three-phase AC voltage of the relay U, V, W and send it to the electric control valve.

[0063] The X2 interface 6 is also connected to the upper DCS control system to receive forward and reverse control commands and transmit the commands to the output switching module 3;

[0064] The X2 interface 6 also receives a fault signal of one of the sub-board A1 or the sub-board B2 or a signal when both the sub-board A1 and the sub-board B2 fail from the output switching module 3 and feeds it back to the upper-layer DCS control system.

[0065] The thyristor commutation circuit 9 includes: bidirectional thyristor A, bidirectional thyristor B, bidirectional thyristor C and bidirectional thyristor D; the bidirectional thyristor A and bidirectional thyristor B are a group, connected to the L1 AC branch in the power input interface of the daughter board A1 or the daughter board B2; the bidirectional thyristor C and bidirectional thyristor D are a group, respectively connected to the L3 AC branch in the power input interface of the daughter board A1 or the daughter board B2;

[0066] When the thyristor commutation circuit 9 receives the forward rotation command from the control and logic protection unit 8, the bidirectional thyristor B and the bidirectional thyristor C in the thyristor commutation circuit 9 are turned on at the same time. At this time, the corresponding relationship between the three-phase power supply and the power output interface 10 is: L1—U, L2—V, L3—W;

[0067] When the thyristor commutation circuit 9 receives the reversal command from the control and logic protection unit 8, the bidirectional thyristor A and the bidirectional thyristor D are turned on. At this time, the corresponding relationship between the three-phase power supply and the power output interface 10 is: L1-W, L2-V, L3-U.

[0068] The power output interface 10 in the daughter card A1 is connected to the relay 4 , and the U and W two-phase AC power are controlled to be on and off through the K1 normally open contact and the K2 normally open contact, and the V phase voltage is directly output to the relay 4 .

[0069] The control method of the electric regulating valve driving device with redundant function described in the present invention comprises the following steps:

[0070] Step 1: When the output switching module 3 detects that the sub-board card A1 and the sub-board card B2 have fault signals, analyze whether the sub-board card is currently in the output state; the fault signals of the sub-board card A1 and the sub-board card B2 include: internal power supply fault signal, thyristor fault signal and state deviation signal;

[0071] Step 2: If the fault signal sub-board in step 1 is the main output module, an alarm signal is issued, and at the same time, the control relay 4 changes the contact on and off to disconnect the three-phase power output of the faulty sub-board and connect the three-phase power output of the hot standby sub-board to the electric control valve;

[0072] Step 3: If the fault signal daughter board is in a non-output state in step 1, only an alarm signal is issued;

[0073] Step 4: When the output switching module 3 detects that both daughter boards have fault signals, it transmits them to the X1 interface to trigger the upstream cabinet circuit breaker of the redundant module to prevent the electric regulating valve from being damaged.

[0074] The present invention is described in detail above with reference to the accompanying drawings and embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. Any content not described in detail in the present invention can adopt the existing technology.

Claims

1. A control method for an electric regulating valve driving device with redundant function, characterized in that: An electric regulating valve driving device with redundant functions comprises: a sub-board card A (1), a sub-board card B (2), a relay (4), an output switching module (3), an X1 interface (5) and an X2 interface (6); the sub-board card A (1) and the sub-board card B (2) are mutually redundantly arranged; the sub-board card A (1) is respectively connected to the relay (4), the X1 interface (5) and the X2 interface (6); the relay (4) is respectively connected to the X1 interface (5) and the X2 interface (6); the relay (4) is also connected to the output switching module (3); the sub-board card B (2) is also respectively connected to the relay (4), the X1 interface (5) and the X2 interface (6); the output switching module (3) is respectively connected to the sub-board card A (1) and the sub-board card B (2); The sub-board A (1) further comprises: a power input interface (7), a control and logic protection unit (8), a thyristor commutation circuit (9) and a power output interface (10); the sub-board A (1) is connected to the X1 interface (5) via the power input interface (7); the power input interface (7) further comprises L1, L2, L3 three-phase alternating current branches for providing L1, L2, L3 three-phase alternating current to the thyristor commutation circuit (9); the thyristor commutation circuit (9) is respectively connected to the power input interface (7) and the power output interface (10); the thyristor commutation circuit (9) is also provided with a control and logic protection unit (8); The sub-board card B (2) also includes: a sub-board card B power input interface, a sub-board card B control and logic protection unit, a sub-board card B thyristor commutation circuit and a sub-board card B power output interface (11); the sub-board card B power input interface is connected to the X1 interface (5); the sub-board card B power input interface includes L1, L2, L3 three-phase AC branches for providing L1, L2, L3 three-phase AC for the sub-board card B thyristor commutation circuit; the sub-board card B thyristor commutation circuit is connected to the sub-board card B power input interface and the sub-board card B power output interface (11) respectively; the sub-board card B thyristor commutation circuit is also provided with a control and logic protection unit; the sub-board card B (2) and the sub-board card A (1) are redundantly arranged, and the sub-board card B (2) has the same structure and function as the sub-board card A (1); A control method for an electric regulating valve driving device with a redundant function comprises the following steps: Step 1: When the output switching module (3) detects that the sub-board card A (1) and the sub-board card B (2) have fault signals, it analyzes whether the sub-board card is currently in an output state; the fault signals of the sub-board card A (1) and the sub-board card B (2) include: an internal power supply fault signal, a thyristor fault signal and a state deviation signal; Step 2: If the fault signal sub-board card in step 1 is the main output module, an alarm signal is issued, and at the same time, the control relay (4) changes the contact on and off to disconnect the three-phase power output of the faulty sub-board card and connect the three-phase power output of the hot standby sub-board card to the electric control valve; Step 3: If the fault signal daughter board is in a non-output state in step 1, only an alarm signal is issued; Step 4: When the output switching module (3) detects that both daughter boards have fault signals, it transmits them to the X1 interface to trigger the upstream cabinet circuit breaker of the redundant module to prevent the electric control valve from being damaged.

2. The control method of the electric regulating valve driving device with redundant function as claimed in claim 1, characterized in that: The control and logic protection unit (8) is connected to the X2 interface (6) and is used to receive control commands and transmit them to the thyristor commutation circuit (9) to control the thyristor on and off; the control commands include: forward rotation, reverse rotation and brake signals; the control and logic protection unit (8) also monitors the operation stability of the thyristor commutation circuit (9) and feeds back the forward rotation and reverse rotation conditions and fault signals to the output switching module (3); the fault signals include: power supply fault signals, thyristor fault signals and state deviation alarm signals; the power output interface (10) is connected to the relay (4), and the power output interface (10) also includes: U-phase, V-phase and W-phase output terminals, which are used to provide U, V and W three-phase alternating currents to the electric control valve.

3. The control method of the electric regulating valve driving device with redundant function as claimed in claim 2, characterized in that: The relay (4) includes two switches, K1 and K2, each of which also includes a group of normally open contacts and normally closed contacts; the normally open contact of the K1 switch in the relay (4) is connected to the U-phase output end of the power output interface on the daughter board A (1), the normally closed contact of the K1 switch is connected to the U-phase output end of the power output interface of the daughter board B (2), the normally open contact of the K2 switch is connected to the W-phase output end of the power output interface of the daughter board A (1), and the normally closed contact of the K2 switch is connected to the W-phase output of the power output interface of the daughter board B (2); The relay receives the control command of the output switching module (3) to control the action of the normally open contact and the normally closed contact, thereby realizing the switching function of the outputs of the two sub-modules; the relay (4) is connected to the X1 interface (5) to transmit the three-phase alternating current U, V, W to the electric regulating valve; the two normally closed contacts K1 and K2 in the relay (4) are connected to the output switching module (3) to feedback the active and standby status of the sub-board card B (2) and the sub-board card A (1).

4. The control method of the electric regulating valve driving device with redundant function as claimed in claim 3, characterized in that: The output switching module (3) is connected to the X2 interface (6) and is used to feed back redundant module alarm signals; the output switching module (3) is connected to the relay (4), and the output switching module (3) diagnoses the fault conditions of the sub-board card A (1) and the sub-board card B (2) and issues commands to control the on and off of two groups of contacts inside the relay (4), thereby realizing the output switching function of the sub-board card A (1) and the sub-board card B (2); the output switching module (3) is also used to receive the fault alarm signals of the sub-board card A (1) and the sub-board card B (2) and perform logical judgment to generate alarm signals.

5. The control method of the electric regulating valve driving device with redundant function as claimed in claim 4, characterized in that: The X1 interface (5) is also connected to the upstream cabinet circuit breaker, and is used to receive the L1, L2 and L3 three-phase AC voltages and send them to the power input interfaces in the daughter board A (1) and the daughter board B (2); the X1 interface (5) is connected to the output switching module (3), When sub-board card A (1) and sub-board card B (2) fail at the same time, the protection terminal outputs an AC 380V voltage to the circuit breaker control circuit to disconnect the circuit breaker; the X1 interface (5) is connected to the relay (4) to receive the three-phase AC voltage of the relay U, V, W and send it to the electric regulating valve.

6. The control method of the electric regulating valve driving device with redundant function as claimed in claim 5, characterized in that: The X2 interface (6) is also connected to an upper-layer DCS control system, and is used to receive forward and reverse control commands, and transmit the commands to the output switching module (3); the X2 interface (6) also receives a fault signal of one of the sub-board card A (1) or the sub-board card B (2) or a signal when both the sub-board card A (1) and the sub-board card B (2) fail, fed back by the output switching module (3), and feeds back the fault signal to the upper-layer DCS control system.

7. The electric control valve driving device with redundant function as claimed in claim 6, characterized in that: The thyristor commutation circuit (9) comprises: a bidirectional thyristor A, a bidirectional thyristor B, a bidirectional thyristor C and a bidirectional thyristor D; the bidirectional thyristor A and the bidirectional thyristor B form a group and are connected to the L1 alternating current branch in the power input interface of the daughter board A (1) or the daughter board B (2); the bidirectional thyristor C and the bidirectional thyristor D form a group and are respectively connected to the L3 alternating current branch in the power input interface of the daughter board A (1) or the daughter board B (2); When the thyristor commutation circuit (9) receives a forward rotation command from the control and logic protection unit (8), the bidirectional thyristor B and the bidirectional thyristor C in the thyristor commutation circuit (9) are turned on simultaneously. At this time, the corresponding relationship between the three-phase power supply and the power output interface (10) is: L1—U, L2—V, L3—W; When the thyristor commutation circuit (9) receives a reversal command from the control and logic protection unit (8), the bidirectional thyristor A and the bidirectional thyristor D are turned on. At this time, the corresponding relationship between the three-phase power supply and the power output interface (10) is: L1-W, L2-V, L3-U.

8. The control method of the electric regulating valve driving device with redundant function as claimed in claim 7, characterized in that: The power output interface (10) in the daughter card A (1) is connected to the relay (4), and the switching of the U and W two-phase alternating currents is controlled through the K1 normally open contact and the K2 normally open contact, and the V-phase voltage is directly output to the relay (4).

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