AC / DC output static rod power supply and control method

Abstract

The invention discloses an AC / DC output static rod power supply and a control method, and relates to the field of reactor rod power supply systems, and the technical scheme is characterized in that an AC assembly comprises two step-down transformers, two AC switches and a switching controller; wherein the two medium-voltage step-down transformers are used for reducing the voltage of the two paths of buses to rated voltage required by the operation of the rod control cabinet, the switching controller controls the two alternating-current switches to feed to the rod control cabinet in an on-off manner, an alternating-current loop is monitored according to the voltage, the frequency and the state of the alternating-current switches, and when the monitoring result of the alternating-current loop is abnormal, the alternating-current loop is switched off. Switching the power supply loop to another normal AC loop to supply power to the rod control cabinet; and the direct current assembly comprises at least one direct current energy storage cabinet formed by connecting a group of super capacitors, a charger and a direct current switch in series, and is used for providing direct current electric energy for the rod control cabinet during the switching period of the alternating current assembly or when two alternating current loops are both interrupted, so as to ensure the power supply of the rod control cabinet.

Description

Technical Field

[0001] The present invention relates to the field of power supply for a rod control rod position system, and more specifically, to a static rod power supply with AC and DC output and a control method. Background Art

[0002] The rod power system is mainly used to supply power to the reactor rod control system (RPC) so that it can drive the control rods to adjust the reactivity of the reactor. In order to ensure the reliability of power supply and prevent the short-term failure of the power grid from causing the RPC power supply to be interrupted and then the reactor to stop, redundant power supply design and energy storage devices are required.

[0003] In nuclear power plants, most of them are powered by two electric generator sets with flywheel energy storage in parallel. This solution has the main problems of large noise and vibration, low efficiency, complex protection, complex mechanical and electrical structure, large maintenance workload, and large size. Second, during the normal operation of the nuclear power plant, the rod power system mainly supplies power to the coils of the reactor control rod drive mechanism (CRDM). A failure in the rod power system will cause the CRDM magnetic coil to lose power. At this time, the drive rod and control rod fall into the core by their own gravity, causing the reactor to shut down urgently, which directly affects the reliable and economic operation of the nuclear power plant. Therefore, it is crucial to ensure the reliability of the main equipment of the static rod power system.

[0004] Although some existing technologies have adopted a rectification-energy storage DC static rod power supply system to optimize the above problems, the DC static rod power supply system still needs to adopt complex power electronic devices for power conversion, and has the problems of large number of electrical components and high consistency requirements for parallel devices, which leads to a decrease in the power supply efficiency and power supply reliability of the control rod drive mechanism power supply. Summary of the invention

[0005] The object of the present invention is to provide a static rod power supply with AC and DC output and a control method, so as to solve the problem of insufficient power supply efficiency and power supply reliability of the existing power supply.

[0006] In a first aspect of the present application, there is provided a static rod power supply with AC and DC outputs, the static rod power supply comprising a DC component and an AC component;

[0007] The AC component includes two step-down transformers, two AC switches and a switching controller. Each step-down transformer is connected to a busbar, and each AC switch is connected to a step-down transformer, thereby forming two AC circuits. The switching controller is connected to the two AC switches. Among them, the two medium-voltage step-down transformers are used to step down the voltage of the two buses to the rated voltage required for the operation of the rod control cabinet. The switching controller controls the two AC switches to switch on and off to feed power to the rod control cabinet, and monitors the AC circuit according to the voltage, frequency, and AC switch status. When the monitoring result of the AC circuit is abnormal, the power supply circuit is switched to another normal AC circuit to supply power to the rod control cabinet.

[0008] The DC component includes at least one DC energy storage cabinet composed of a group of super capacitors, a charger and a DC switch connected in series, which is used to provide DC power to the rod control cabinet during the switching of the AC component or when both AC circuits are interrupted to ensure the power supply of the rod control cabinet;

[0009] The output of the AC component is connected to the input of the AC unit of the rod control cabinet, and the output of the DC component is connected to the DC unit of the rod control cabinet.

[0010] In one implementation, the AC component further includes a bypass switch, which is interlocked with the two AC switches and cannot be closed simultaneously with the AC switches of different AC circuits.

[0011] In one implementation, two AC switches are mechanically and electrically interlocked, so that only one AC switch can be closed to provide AC power to the rod control cabinet.

[0012] In one implementation, the step-down transformer is a Δ / Z type transformer with a zigzag connection on the secondary side.

[0013] In one implementation, when the number of DC energy storage cabinets is greater than one, multiple DC energy storage cabinets are connected in parallel.

[0014] In one implementation, a self-powered circuit is provided in the DC energy storage cabinet, which is used to utilize part of the energy of the supercapacitor to provide backup power for the control circuit, and maintain normal operation of the control circuit when the external AC power is lost.

[0015] In a second aspect of the present application, a control method for a static rod power supply with AC / DC output is provided, which is applied to a static rod power supply with AC / DC output provided in the first aspect of the present application, and the method comprises:

[0016] Detect whether the bus is available and whether the AC switch can be closed by switching the controller;

[0017] When the switching controller detects that the voltage or frequency of one AC circuit is abnormal and exceeds the time threshold, and the other AC circuit is normal, the switching controller controls the AC switch of the other AC circuit to open, and controls the AC switch to close after the arc is extinguished;

[0018] If the AC output is abnormal, the DC energy storage cabinet will discharge externally according to the voltage change of the rod control cabinet to maintain the operation of the rod control cabinet;

[0019] When the AC power input is switched and the output AC voltage is restored, the DC energy storage cabinet stops discharging according to the voltage of the rod control cabinet, and determines whether the remaining capacity meets the next switching requirement. If not, the charger is controlled to replenish power until the DC voltage of the DC energy storage cabinet returns to the rated value.

[0020] In one implementation, the method further includes: if one AC circuit is unavailable, and the switching controller detects that another AC circuit is also abnormal or an AC switch associated therewith fails, an alarm signal of power loss is issued.

[0021] In one implementation, when the DC voltage of the DC energy storage cabinet returns to a rated value, the charger is controlled to stop running.

[0022] In one implementation, the AC output abnormality period includes two AC circuit abnormalities and two AC switch switching periods.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The static rod power supply provided in this application is normally powered by a transformer for the rod control system, which has high efficiency. The DC energy storage cabinet does not need to be connected to the power supply. Only when the power grid fails, the DC energy storage cabinet provides power during the AC switching period or the short-term AC interruption period. Since the probability of failure of the power plant power grid is low, the DC energy storage cabinet is in standby state for a long time, which helps to extend the service life of the energy storage equipment. Secondly, two normal plant AC busbars are used for power supply, and the external interface is simple and the demand is small. The main power components such as transformers, circuit breakers, and supercapacitors in the static rod power supply are all non-active components, and no forced heat dissipation is required. The structure is simple, the efficiency is high, the reliability is high, the noise is low, and the economy is good. It can meet the power supply requirements of the control rod drive mechanism of various types of nuclear power plants. During normal operation, only one AC switch (AC switch 1 or AC switch 2) is closed to provide AC power to the rod control cabinet. The switching controller detects the two AC power supplies in real time and switches to the other power supply when one fails. The supercapacitor in the energy storage cabinet provides DC power to the rod control cabinet during the transient period of AC power failure. A DC outlet switch is provided for connecting two energy storage cabinets in parallel. When a fault occurs, the faulty circuit can be cut off in time. One DC energy storage cabinet is sufficient to meet the needs of normal operation of the load. A charger is provided to charge the supercapacitor group to maintain its rated operating state. A bypass switch is designed for the AC power supply switch, and the switching controller and switch can be tested during the overhaul of the power plant. Therefore, the static rod power supply provided in the embodiment of the present application can solve the problem of insufficient power supply efficiency and power supply reliability of the existing power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0026] Figure 1 A schematic diagram of the structure of a static rod power supply with AC and DC output provided in an embodiment of the present application;

[0027] Figure 2 A control flow chart of a control method for a static rod power supply with AC / DC output provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0029] It should be noted that the terms "include" or "may include" used in various embodiments of the present application indicate the presence of the function, operation or element applied for, and do not limit the addition of one or more functions, operations or elements. In addition, as used in various embodiments of the present application, the terms "include", "have" and their cognates are only intended to indicate specific features, numbers, steps, operations, elements, components or a combination of the foregoing items, and should not be understood as first excluding the presence of one or more other features, numbers, steps, operations, elements, components or a combination of the foregoing items or the possibility of adding one or more features, numbers, steps, operations, elements, components or a combination of the foregoing items.

[0030] In various embodiments of the present application, the expression "or" or "at least one of B or / and C" includes any combination or all combinations of the words listed at the same time. For example, the expression "B or C" or "at least one of B or / and C" may include B, may include C, or may include both B and C. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0031] In nuclear power plants, most of them are powered by two electric generator sets with flywheel energy storage in parallel. This solution has the main problems of large noise and vibration, low efficiency, complex protection, complex mechanical and electrical structure, large maintenance workload, and large size. Second, during the normal operation of the nuclear power plant, the rod power system mainly supplies power to the coils of the reactor control rod drive mechanism (CRDM). A failure in the rod power system will cause the CRDM magnetic coil to lose power. At this time, the drive rod and control rod fall into the core by their own gravity, causing the reactor to shut down urgently, which directly affects the reliable and economic operation of the nuclear power plant. Therefore, it is crucial to ensure the reliability of the main equipment of the static rod power system.

[0032] Although some existing technologies have adopted a rectification-energy storage DC static rod power supply system to optimize the above problems, the DC static rod power supply system still needs to adopt complex power electronic devices for power conversion, and has the problems of large number of electrical components and high consistency requirements for parallel devices, which leads to a decrease in the power supply efficiency and power supply reliability of the control rod drive mechanism power supply.

[0033] Therefore, in order to solve the problem of insufficient power supply efficiency and power supply reliability of the existing power supply, this embodiment provides a static rod power supply with AC and DC output. Under normal circumstances, the static rod power supply uses a transformer to power the rod control system, which has high efficiency. The DC energy storage cabinet does not need to be connected to the power supply. Only when the power grid fails, the DC energy storage cabinet provides power during the AC switching period or the short-term AC interruption period. Since the probability of failure of the power plant power grid is low, the DC energy storage cabinet is in standby state for a long time, which helps to extend the service life of the energy storage equipment. Secondly, two normal plant AC busbars are used for power supply, and the external interface is simple and the demand is small. The main power components such as transformers, circuit breakers, and supercapacitors in the static rod power supply are all non-active components, and no forced heat dissipation is required. They have a simple structure, high efficiency, high reliability, low noise, and good economy, which can meet the power supply requirements of the control rod drive mechanism of the nuclear power plant.

[0034] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a static rod power supply with AC and DC output provided in an embodiment of the present application, such as Figure 1 As shown, the static rod power supply includes a DC component and an AC component;

[0035] The AC component includes two step-down transformers, two AC switches and a switching controller, each step-down transformer is connected to a bus, and each AC switch is connected to a step-down transformer, so as to form two AC circuits; the switching controller is connected to the two AC switches; wherein the two medium-voltage step-down transformers are used to step down the voltage of the two buses to the rated voltage required for the operation of the rod control cabinet, and the two AC switches are controlled by the switching controller to feed power to the rod control cabinet, and the AC circuit is monitored according to the voltage, frequency and AC switch status. When the monitoring result of the AC circuit is abnormal, the power supply circuit is switched to another normal AC circuit to supply power to the rod control cabinet; the DC component includes at least one DC energy storage cabinet composed of a super capacitor, a charger and a DC switch connected in series, which is used to provide DC power to the rod control cabinet during the switching of the AC component or when both AC circuits are interrupted to ensure the power supply of the rod control cabinet; wherein the output of the AC component is connected to the AC unit of the rod control cabinet and the input of the DC component, and the output of the DC component is connected to the DC unit of the rod control cabinet.

[0036] In some embodiments, the AC component also includes a bypass switch, which is interlocked with the two AC switches and cannot be closed at the same time as the AC switches of different AC circuits. The two AC switches are mechanically and electrically interlocked, and only one AC switch can be closed to provide AC power to the rod control cabinet. The step-down transformer adopts a △ / Z type transformer with a zigzag connection on the secondary side. When the number of DC energy storage cabinets is greater than one, multiple DC energy storage cabinets are connected in parallel. A self-powered circuit is provided in the DC energy storage cabinet, which is used to utilize part of the energy of the supercapacitor to provide backup power for the control circuit, and maintain the normal operation of the control circuit when the external AC power is lost.

[0037] Specifically, this embodiment is a static rod power supply with AC and DC output capabilities, which is composed of two transformers, two AC switches, a switching controller, and at least one DC energy storage cabinet. It is mainly composed of a △ / Z type medium voltage step-down transformer, an AC power supply switch, a switching controller, a charger, a super capacitor, a DC outlet switch, etc.

[0038] For example, the AC power source can be a 10 kV AC source for providing AC power. Figure 1 As shown, the AC power supply consists of two busbars, wherein the output end of the busbar is connected to a step-down transformer to step down the busbar voltage to the rated voltage required for the operation of the rod control cabinet, such as 175V. Then, the output end of the transformer is connected to one end of the AC switch 1, and the other end of the AC switch 1 is connected to the AC unit of the rod control cabinet. The structure of the supercapacitor is mainly composed of positive and negative electrode materials, diaphragms and electrolytes. Its working principle is based on the double layer principle or the Faraday pseudocapacitor principle. The double layer capacitor is generated by the confrontation of charges caused by the directional arrangement of electrons or ions at the electrode / solution interface, while the Faraday pseudocapacitor generates capacitance through highly reversible chemical adsorption and desorption and redox reactions of electroactive substances on the electrode surface and near the surface. The charger is mainly based on the rectification principle of power devices. By controlling the changes in current and voltage, it converts alternating current (AC) into direct current (DC), and accurately adjusts the output voltage and current to meet the charging needs of batteries or supercapacitors. The charger usually adopts a three-stage charging method of constant current / constant voltage / small constant current intelligence. The pre-charging stage is used to activate the internal chemical substances of the battery or supercapacitor to prevent large current from directly impacting the battery or supercapacitor; the constant current charging stage is used to charge with a constant current until the battery or supercapacitor voltage reaches a preset value; then it enters the constant voltage charging stage, keeping the voltage constant and gradually reducing the current until the battery or supercapacitor is fully charged; finally, the charger automatically terminates charging by detecting the status of the battery or supercapacitor to prevent overcharging.

[0039] A switching controller usually refers to a device that can automatically or manually switch the AC power supply. It ensures that when one power supply fails, it can quickly and reliably switch to another power supply to ensure the continuous operation of the equipment.

[0040] The number of DC energy storage cabinets can be one or more. This embodiment takes two as an example for explanation, mainly to avoid that when one DC energy storage cabinet is abnormal, it cannot provide enough energy for the control rod to operate normally during the power transient period. It can be understood that the input of the charger is connected to the output of the AC switch 1, the AC switch 2 and the bypass switch.

[0041] The transformer adopts a △ / Z type medium voltage step-down transformer, which provides AC voltage that meets the needs of the load rod control cabinet while reducing the harmonic impact of the load on the power grid. The transformer outputs AC in normal operation and supercapacitor DC output in abnormal operation. It is suitable for AC and DC input rod control equipment, with high working efficiency, simple structure, less intervention of DC energy storage equipment, low noise and long service life.

[0042] The AC power switching circuit with bypass is composed of AC switch 1, AC switch 2 and a control switch. It has the ability to maintain load power supply and test the AC switching function when the power supply demand is not high during power plant overhaul.

[0043] The DC energy storage cabinet adopts a supercapacitor-based solution with the advantages of large output current, rapid output response, good safety and simple maintenance. It can also adopt a hybrid battery solution such as capacitors and batteries to increase the energy storage capacity and extend the discharge time.

[0044] A self-powered circuit is provided in the DC energy storage cabinet, which can use part of the energy of the supercapacitor to provide backup power for the system control circuit. When the external power supply is lost, the normal operation of the system control circuit is maintained, reducing the external power supply requirements. Therefore, this embodiment can effectively improve the reliability of the rod power supply system, the maintainability and economy of the equipment, and can meet the power supply requirements of the control rod drive mechanism of various types of nuclear power plants.

[0045] The working principle of the static rod power supply provided in this embodiment is as follows: During normal operation, only one AC switch (AC switch 1 or AC switch 2) is closed to provide AC power to the rod control cabinet. The switching controller detects two AC power supplies in real time and switches to the other power supply when one fails. The supercapacitor in the energy storage cabinet provides DC power to the rod control cabinet during the transient period of AC power failure. A DC outlet switch is provided for connecting two energy storage cabinets in parallel. When a fault occurs, the faulty circuit can be cut off in time. One DC energy storage cabinet is sufficient to meet the needs of normal operation of the load. A charger is provided to charge the supercapacitor group to maintain its rated operating state. A bypass switch is designed for the AC power supply switch, so that the switching controller and switch can be tested during the overhaul of the power plant.

[0046] In summary of the embodiments described above, the static rod power supply designed by the present invention is powered by a transformer for the rod control system under normal circumstances, which is highly efficient. The energy storage cabinet does not need to be connected to the power supply. Only when the power grid fails, the energy storage cabinet provides power during the AC switching period or the short AC interruption period. Since the probability of failure of the power plant power grid is low, the energy storage cabinet is in standby state for a long time, which helps to extend the service life of the energy storage equipment.

[0047] The rod power supply adopts two normal plant AC busbars for power supply, with simple external interface and small requirements. The main power components in the system, such as transformer, circuit breaker, super capacitor, etc., are all passive components, without forced heat dissipation, simple structure, high efficiency, high reliability, low noise, good economy, and can meet the power supply requirements of various types of nuclear power plant control rod drive mechanisms.

[0048] Please refer to Figure 2 , Figure 2 A control flow chart of a control method of a static rod power supply with AC and DC output provided in an embodiment of the present application, wherein the static rod power supply includes a DC component and an AC component;

[0049] The AC component includes two step-down transformers, two AC switches and a switching controller, each step-down transformer is connected to a bus, and each AC switch is connected to a step-down transformer, so as to form two AC circuits; the switching controller is connected to the two AC switches; wherein the two medium-voltage step-down transformers are used to step down the voltage of the two buses to the rated voltage required for the operation of the rod control cabinet, and the two AC switches are controlled by the switching controller to feed power to the rod control cabinet, and the AC circuit is monitored according to the voltage, frequency and AC switch status. When the monitoring result of the AC circuit is abnormal, the power supply circuit is switched to another normal AC circuit to supply power to the rod control cabinet; the DC component includes at least one DC energy storage cabinet composed of a group of super capacitors, a charger and a DC switch connected in series, which is used to provide DC power to the rod control cabinet during the switching of the AC component or when both AC circuits are interrupted to ensure the power supply of the rod control cabinet; wherein the output of the AC component is connected to the input of the AC unit of the rod control cabinet, and the output of the DC component is connected to the DC unit of the rod control cabinet.

[0050] like Figure 2 As shown, the method includes:

[0051] Detect whether the bus is available and whether the AC switch can be closed by switching the controller;

[0052] When the switching controller detects that the voltage or frequency of one AC circuit is abnormal and exceeds the time threshold, and the other AC circuit is normal, the switching controller controls the AC switch of the other AC circuit to open, and controls the AC switch to close after the arc is extinguished;

[0053] If the AC output is abnormal, the DC energy storage cabinet will discharge externally according to the voltage change of the rod control cabinet to maintain the operation of the rod control cabinet;

[0054] When the AC power input is switched and the output AC voltage is restored, the DC energy storage cabinet stops discharging according to the voltage of the rod control cabinet, and determines whether the remaining capacity meets the next switching requirement. If not, the charger is controlled to replenish power until the DC voltage of the DC energy storage cabinet returns to the rated value.

[0055] For more information, see Figure 2 In this embodiment, the control process of switching the AC circuit 1 formed by the AC switch 1 to the AC circuit 2 formed by the AC switch 2 is as follows:

[0056] First, switch the controller to detect that both normal AC factory busbars are available. The controller can manually or automatically close the AC power supply switch 1, and the system is ready for AC output.

[0057] At this time, the operator manually charges the energy storage cabinet, and the energy storage cabinet automatically stops charging when it detects that the rated DC voltage has been reached;

[0058] When the energy storage self-test is fault-free, the operator can manually close the DC switch in the energy storage cabinet. At this point, the rod power supply system is ready to provide AC and DC power to the load;

[0059] When the switching controller detects that the voltage or frequency of AC circuit 1 is abnormal for more than 1s (adjustable) and AC circuit 2 is normal, the switching controller automatically opens AC power supply switch 1 and automatically closes AC power supply switch 2 after the arc is extinguished;

[0060] If one AC circuit is unavailable, and the switching controller detects that another AC circuit is also abnormal or the AC switch associated with it is faulty, a power loss alarm signal is issued. For example, if AC circuit 1 is unavailable, and the switching controller detects that AC circuit 2 is also abnormal or AC power switch 2 is faulty, the system issues a "rod power AC power loss alarm" to the main control room;

[0061] During the period of abnormal AC output of the system (including the abnormality of two AC circuits and the switching period of two AC switches), the energy storage cabinet automatically discharges to the outside according to the voltage change at the load end to maintain the operation of the load;

[0062] When the system AC input completes switching and the output AC voltage is restored, the DC energy storage cabinet automatically ends discharging according to the load end voltage, and automatically determines whether the remaining capacity meets the next switching requirements. If not, the charger is controlled to automatically replenish power until the DC voltage returns to the maximum rated value.

[0063] This embodiment also provides a control process of switching the AC circuit 2 formed by the AC switch 2 to the AC circuit 1 formed by the AC switch 1, which is specifically as follows:

[0064] First, switch the controller to detect that both normal AC factory busbars are available. The controller can manually or automatically close the AC power supply switch 2, and the system is ready for AC output.

[0065] At this time, the operator manually charges the energy storage cabinet, and the energy storage cabinet automatically stops charging when it detects that the rated DC voltage has been reached;

[0066] When the energy storage self-test is fault-free, the operator can manually close the DC switch in the energy storage cabinet. At this point, the rod power supply system is ready to provide AC and DC power to the load;

[0067] When the switching controller detects that the voltage or frequency of AC circuit 2 is abnormal for more than 1s (adjustable) and AC circuit 1 is normal, the switching controller automatically opens AC switch 2 and automatically closes AC switch 1 after the arc is extinguished;

[0068] If one AC circuit is unavailable, and the switching controller detects that another AC circuit is also abnormal or the AC switch associated with it is faulty, a power loss alarm signal is issued. For example, if AC circuit 2 is unavailable, and the switching controller detects that AC circuit 1 is also abnormal or AC power switch 1 is faulty, the system issues a "rod power AC power loss alarm" to the main control room;

[0069] During the period of abnormal AC output of the system (including the abnormality of two AC circuits and the switching period of two AC switches), the energy storage cabinet automatically discharges to the outside according to the voltage change at the load end to maintain the operation of the load;

[0070] When the system AC input completes switching and the output AC voltage is restored, the DC energy storage cabinet automatically ends discharging according to the load end voltage, and automatically determines whether the remaining capacity meets the next switching requirements. If not, the charger is controlled to automatically replenish power until the DC voltage returns to the maximum rated value.

[0071] It can be seen that based on the control method provided in this embodiment, the static rod power supply is powered by a transformer for the rod control system under normal circumstances, and the efficiency is relatively high. During normal operation, only one AC switch (AC switch 1 or AC switch 2) is closed to provide AC power to the rod control cabinet. The switching controller detects the two AC power supplies in real time and switches to the other power supply when one fails. The supercapacitor in the energy storage cabinet provides DC power to the rod control cabinet during the transient period of AC power failure. A DC outlet switch is provided for connecting two energy storage cabinets in parallel. When a fault occurs, the fault circuit can be cut off in time. One DC energy storage cabinet is sufficient to meet the needs of normal operation of the load. A charger is provided to charge the supercapacitor group to maintain its rated operating state. A bypass switch is designed for the AC power supply switch, and the switching controller and switch can be tested during the overhaul of the power plant.

[0072] The embodiment of the present application also provides a computer-readable storage medium, which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the control method of a static rod power supply with AC and DC output in the above embodiment. Those skilled in the art should understand that the embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0073] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A static rod power supply with AC and DC output, characterized in that: The static rod power supply includes a DC component and an AC component; The AC component includes two step-down transformers, two AC switches and a switching controller. Each step-down transformer is connected to a busbar, and each AC switch is connected to a step-down transformer, thereby forming two AC circuits. The switching controller is connected to the two AC switches. Among them, the two medium-voltage step-down transformers are used to step down the voltage of the two buses to the rated voltage required for the operation of the rod control cabinet. The switching controller controls the two AC switches to switch on and off to feed power to the rod control cabinet, and monitors the AC circuit according to the voltage, frequency, and AC switch status. When the monitoring result of the AC circuit is abnormal, the power supply circuit is switched to another normal AC circuit to supply power to the rod control cabinet. The DC component includes at least one DC energy storage cabinet composed of a group of super capacitors, a charger and a DC switch connected in series, which is used to provide DC power to the rod control cabinet during the switching of the AC component or when both AC circuits are interrupted for a short time to ensure the power supply of the rod control cabinet; The output of the AC component is connected to the input of the AC unit of the rod control cabinet, and the output of the DC component is connected to the DC unit of the rod control cabinet.

2. The static rod power supply with AC and DC output according to claim 1, characterized in that: The AC component also includes a bypass switch, which is interlocked with the two AC switches and cannot be closed simultaneously with the AC switches of different AC circuits.

3. The static rod power supply with AC and DC output according to claim 2, characterized in that: The two AC switches are mechanically and electrically interlocked, and only one AC switch can be closed to provide AC power to the rod control cabinet.

4. The static rod power supply with AC and DC output according to claim 1, characterized in that: The step-down transformer adopts a △ / Z type transformer with a secondary side zigzag connection.

5. The static rod power supply with AC and DC output according to claim 1, characterized in that: When the number of DC energy storage cabinets is greater than one, multiple DC energy storage cabinets are connected in parallel.

6. The static rod power supply with AC and DC output according to claim 1, characterized in that: The DC energy storage cabinet is equipped with a self-powered circuit, which is used to utilize part of the energy of the supercapacitor to provide backup power for the control circuit, and maintain normal operation of the control circuit when the external AC power is lost.

7. A control method for a static rod power supply with AC and DC output, characterized in that: Applied to a static rod power supply with AC / DC output as claimed in any one of claims 1 to 6, the method comprises: Detect whether the bus is available and whether the AC switch can be closed by switching the controller; When the switching controller detects that the voltage or frequency of one AC circuit is abnormal and exceeds the time threshold, and the other AC circuit is normal, the switching controller controls the AC switch of the other AC circuit to open, and controls the AC switch to close after the arc is extinguished; If the AC output is abnormal, the DC energy storage cabinet will discharge externally according to the voltage change of the rod control cabinet to maintain the operation of the rod control cabinet; When the AC power input is switched and the output AC voltage is restored, the DC energy storage cabinet stops discharging according to the voltage of the rod control cabinet, and determines whether the remaining capacity meets the next switching requirement. If not, the charger is controlled to replenish power until the DC voltage of the DC energy storage cabinet returns to the rated value.

8. The control method of a static rod power supply with AC and DC output according to claim 7, characterized in that: The method also includes: if one AC circuit is unavailable, and the switching controller detects that another AC circuit is also abnormal or an AC switch associated therewith fails, an alarm signal of power loss is issued.

9. The control method of a static rod power supply with AC and DC output according to claim 7, characterized in that: When the DC voltage of the DC energy storage cabinet returns to the rated value, the charger is controlled to stop running.

10. The control method of a static rod power supply with AC and DC output according to claim 7, characterized in that: The AC output abnormality period includes two AC circuit abnormalities and two AC switch switching periods.

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