High-reliability rod power supply system

Abstract

The invention relates to a high-reliability rod power supply system, which comprises two rectifiers, two storage battery cabinets, a parallel output cabinet and a system monitoring unit, and is characterized in that the output end of one rectifier is electrically connected with one storage battery cabinet to form a power supply circuit; the output ends of the two rectifiers and the output ends of the two storage battery cabinets are electrically connected to the parallel output cabinet respectively, the parallel output cabinet is electrically connected with a load, and the system monitoring unit is used for monitoring and controlling the running states of the rectifiers, the storage battery cabinets and the parallel output cabinet in real time.

Description

Technical Field

[0001] The invention relates to the field of nuclear power plant electrical systems, and in particular to a high-reliability rod power supply system. Background Art

[0002] The rod power system is a DC power system that provides a stable power supply to the control rod drive mechanism (CRDM) and is not affected by transient disturbances of the upstream input power supply.

[0003] At present, the rod power supply system at home and abroad mainly adopts the form of asynchronous motor-energy storage flywheel-synchronous generator, outputting AC power, and then providing stable DC power for the control rod drive mechanism through the rectifier. Due to the use of energy storage flywheel, the rod power supply system can meet the continuous supply of electricity under power failure conditions.

[0004] The existing rod power supply system has the following disadvantages:

[0005] 1. Since motors and generators are both rotating mechanical equipment, they produce a lot of noise and vibration;

[0006] 2. The power loss is large, which is not energy-saving and environmentally friendly;

[0007] 3. Since the motor cannot adjust the speed, it is difficult to parallel the vehicle without load;

[0008] 4. The rod power supply system is relatively complex, occupies a large area, has poor reliability, requires a lot of maintenance, and is expensive. Summary of the invention

[0009] Aiming at the defects of the rod power supply system of the existing nuclear power plant, the present invention provides a rod power supply system.

[0010] The rod power supply system comprises: 2 rectifiers, 2 battery cabinets, 1 parallel output cabinet, and 1 system monitoring unit. The output end of the 1 rectifier is electrically connected to the 1 battery cabinet to form a power supply circuit. The output ends of the 2 rectifiers and the output ends of the 2 battery cabinets are electrically connected to the parallel output cabinet, which is electrically connected to the load. The system monitoring unit is used to monitor and control the operating status of the rectifier, the battery cabinet, and the parallel output cabinet in real time.

[0011] The rectifier comprises: a dual power switching unit and a rectifying unit, wherein the dual power switching unit is connected to two external AC power supplies and is electrically connected to the rectifying unit, and the output end of the rectifying unit is the output end of the rectifier;

[0012] The parallel output cabinet comprises two DC / DC voltage stabilizing units, two anti-backflow diodes, three isolating knife switches and a DC insulation monitoring unit, wherein one DC / DC voltage stabilizing unit, one anti-backflow diode and one isolating knife switch are connected in series into one branch, thereby forming two branches, the two branches are connected in parallel and connected in series with the DC insulation monitoring unit and the third isolating knife switch, and the DC insulation monitoring unit is located between the two parallel branches and the third isolating knife switch.

[0013] Among them, the rectifier also includes a comprehensive processing unit, which is used to collect the AC voltage, battery voltage, control mother voltage, combined mother voltage, control mother current, battery current, as well as switch input and switch output of the rod power supply system, and send the collected data to the system monitoring unit.

[0014] The rectifier unit adopts multiple parallel AC / DC modules, and each AC / DC module includes: an input EMI filter, a three-phase Vienna AC / DC circuit, a high-frequency DC / DC circuit, an output filter circuit, and a control circuit. The input end of the input EMI filter is connected to a 380V three-phase alternating current, the output end of the input EMI filter is electrically connected to the input end of the three-phase Vienna AC / DC circuit, the output end of the three-phase Vienna AC / DC circuit is connected to the input end of the high-frequency DC / DC circuit, the output end of the high-frequency DC / DC circuit is connected to the input end of the output filter circuit, and the output end of the filter circuit outputs a 110V DC voltage. The control circuit is respectively connected to an AC voltage of 380V and a DC voltage of 110V, and is respectively electrically connected to the three-phase Vienna AC / DC circuit and the high-frequency DC / DC circuit.

[0015] Wherein, the input EMI filter includes: a first-stage π-type filter circuit and a second-stage π-type filter circuit connected in series, and three phase lines A, B and C providing 380V three-phase AC power are respectively connected to the first-stage π-type filter circuit, the first-stage π-type filter circuit includes: a first capacitor component, a second capacitor component, a third capacitor component, a fourth capacitor component and a first inductor component, and the second-stage π-type filter circuit includes: a third capacitor component, a fourth capacitor component, a fifth capacitor component, a sixth capacitor component and a second inductor component, wherein: the first capacitor component, the third capacitor component and the fifth capacitor component each include 3 identical capacitors, the second capacitor component, the fourth capacitor component and the sixth capacitor component each include 3 identical capacitors, the first inductor component and the second inductor component each include 3 identical inductors, and the first-stage π-type filter circuit and the second-stage π-type filter circuit share the third capacitor component and the fourth capacitor component.

[0016] Beneficial effects:

[0017] 1) The rod power supply system implemented by the present invention eliminates the need for motors and generators, and has relatively low noise and vibration;

[0018] 2) The rod power supply system implemented by the present invention is composed of power electronic equipment, with low power loss, energy saving and environmental protection;

[0019] 3) The rod power supply system realized by the present invention is easy to connect to the vehicle without load;

[0020] 4) The rod power supply system implemented by the present invention has a relatively simple structure, occupies a small area, is low in price, and adopts multiple redundancy and backup designs, has high reliability, and is easy to operate and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the circuit schematic diagram of the rod power supply system;

[0022] Figure 2 It is the schematic diagram of a single AC / DC module in the rectifier unit;

[0023] Figure 3 This is the schematic diagram of the input EMI filter;

[0024] Figure 4 It is the schematic diagram of the three-phase Vienna AC / DC circuit in the EMI filter;

[0025] Figure 5 This is the schematic diagram of the high-frequency DC / DC circuit in the EMI filter. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The following is combined with Figure 1-5 The present invention is described in detail with specific examples.

[0028] Figure 1 The schematic diagram of the rod power system is shown in Figure 2. Figure 1 As shown, the high-reliability rod power supply system provided by the present invention comprises: two rectifiers 1 and 2, two battery cabinets 1 and 2, a parallel output cabinet, and a system monitoring unit, wherein the output end of the one rectifier is electrically connected to the one battery cabinet to form a power supply circuit, the output ends of the two rectifiers and the output ends of the two battery cabinets are electrically connected to the parallel output cabinet respectively, and the parallel output cabinet is electrically connected to the load, and the system monitoring unit is used to monitor and control the operating status of the rectifier, the battery cabinet, and the parallel output cabinet in real time;

[0029] The rectifier comprises: a dual power switching unit and a rectifying unit, wherein the dual power switching unit is connected to two external AC power supplies and is electrically connected to the rectifying unit, and the output end of the rectifying unit is the output end of the rectifier;

[0030] The parallel output cabinet comprises two DC / DC voltage stabilizing units, two anti-backflow diodes, three isolation knife switches Q1, Q2 and Q3, and a DC insulation monitoring unit, wherein one DC / DC voltage stabilizing unit, one anti-backflow diode and one isolation knife switch Q1 are connected in series to form a branch, another DC / DC voltage stabilizing unit, another anti-backflow diode and the second isolation knife switch Q2 are connected in series to form a branch, thereby forming two branches, the two branches are connected in parallel and connected in series with the DC insulation monitoring unit and the third isolation knife switch Q3, and the DC insulation monitoring unit is located between the two parallel branches and the third isolation knife switch Q3.

[0031] The system monitoring unit is used to monitor and control the operating status of each module of the rod power system in real time, which can be achieved by using existing known technologies.

[0032] The main function of the parallel output cabinet is to connect the outputs of the two rectifiers in parallel and realize the on-off function of the load. Among them, the isolation knife switches Q1 and Q2 are used as switches to control the on-off of the output circuit, and the isolation knife switch Q3 is used as a switch to control the output aggregation of the two rectifiers. The DC / DC voltage stabilizing unit is used to convert a voltage with a larger fluctuation range (fluctuation range of about 10%) into a voltage with a smaller fluctuation range (fluctuation range less than 5%) to meet the higher steady-state accuracy requirements of the output voltage of the rod power system.

[0033] The DC / DC voltage stabilizing unit uses multiple parallel DC / DC modules. The DC / DC module adopts a mature phase-shifted full-bridge topology junction solution to output a stable DC voltage.

[0034] The anti-backflow diode is used to prevent current backflow when the load is abnormal.

[0035] The DC insulation monitoring unit is used to monitor the DC insulation impedance of the rod power supply system in real time and to issue an alarm when it exceeds a limit value. This can be achieved using existing known technologies.

[0036] The rod power supply system receives two relatively independent three-phase AC380V power supplies through a dual power switching unit, and provides one DC110V power output after power electronic conversion.

[0037] The capacity of a single rectifier and a single battery cabinet is designed to meet the total load power. In the event of a rectifier failure, the other rectifier can continue to operate to provide a stable DC110V power output to ensure the normal operation of the control rod drive mechanism, thereby achieving 100% redundancy. If both rectifiers fail, the battery cabinet can still supply power to the load within the required time, and the battery cabinet will continue to supply power to the load for at least 2.2 seconds through the parallel output cabinet.

[0038] Under normal circumstances, the two rectifiers each receive two three-phase AC380V power supplies, convert them into DC110V, and provide DC power to the load through the parallel output cabinet; at the same time, the two battery groups are charged. If one power supply fails, the two rectifiers can still be powered by the other power supply and output DC110V power normally.

[0039] The control system of the rod power system monitors the input AC voltage in real time. Once it determines that the AC power is lost, it starts timing and issues a command to stop the rectifier, and the battery pack discharges to supply power to the load. If the input AC power is restored within 2.2s, the rectifier will start running again. The rectifier will provide energy to the load on the one hand and charge the battery pack on the other hand; if the input AC power is not restored within 2.2s, the control system will drive the output circuit breaker to disconnect after the set maximum discharge time of the battery pack (this time is less than 5s), and the rod power system will stop outputting.

[0040] For example, when the input AC power is normal, rectifier 1 and rectifier 2 are connected in parallel to supply power to the load. If the mains power (input AC power) of rectifier 1 or itself fails, rectifier 2 will supply power to the load independently. If the mains power (input AC power) of rectifier 2 or itself also fails, the load will be powered by the battery pack. If the mains power is restored within 2.2s, rectifier 1 and rectifier 2 will be immediately switched back to supply power to the load in parallel; if the mains power is not restored within 2.2s, the load will be powered by the battery pack for the set time T, for example, the battery will continuously output between 2.2s and 5s; if the set time T (for example, 5s) is exceeded, the battery will stop outputting. The set time T should be greater than 2.2s and less than or equal to 5s.

[0041] The AC input side of the rectifier is equipped with a dual power switching unit. The dual power switching unit is connected to two AC power sources and monitors the two power sources in real time. It can cut off the faulty AC input power source and automatically connect to the normal AC power source to improve the power supply continuity of the rectifier. The dual power switching unit can be a product sold on the market, such as dual power switching units produced by ABB, Schneider, etc.

[0042] The rectifier unit uses multiple parallel AC / DC modules, which not only improves system reliability through N+1 redundancy, but also facilitates the expansion of system capacity.

[0043] Figure 2 The schematic diagram of a single AC / DC module in a rectifier unit.

[0044] The rectifier unit adopts multiple parallel AC / DC modules, and each AC / DC module includes: an input EMI filter, a three-phase Vienna AC / DC circuit, a high-frequency DC / DC circuit, an output filter circuit, and a control circuit, wherein the input end of the input EMI filter is connected to a 380V three-phase alternating current, the output end of the input EMI filter is electrically connected to the input end of the three-phase Vienna AC / DC circuit, the output end of the three-phase Vienna AC / DC circuit is connected to the input end of the high-frequency DC / DC circuit, the output end of the high-frequency DC / DC circuit is connected to the input end of the output filter circuit, the output end of the filter circuit outputs a 110V DC voltage, the control circuit is respectively connected to an AC voltage of 380V and a DC voltage of 110V, and is respectively electrically connected to the three-phase Vienna AC / DC circuit and the high-frequency DC / DC circuit.

[0045] The control circuit adopts DSP (digital signal processor) and is implemented in combination with corresponding peripheral circuits, and utilizes existing technologies to realize various functions such as driving, controlling, detecting, logical judgment, protecting, fault diagnosis, alarming, and communicating of the AC / DC module.

[0046] Figure 3 This is the schematic diagram of the input EMI filter.

[0047] The input EMI filter comprises: a first-stage π-type filter circuit and a second-stage π-type filter circuit connected in series, three phase lines A, B and C providing 380V three-phase AC power are respectively connected to the first-stage π-type filter circuit, the first-stage π-type filter circuit comprises: a first capacitor component, a second capacitor component, a third capacitor component, a fourth capacitor component and a first inductor component, the second-stage π-type filter circuit comprises: a third capacitor component, a fourth capacitor component, a fifth capacitor component, a sixth capacitor component and a second inductor component, wherein: the first capacitor component, the third capacitor component and the fifth capacitor component each include three identical capacitors, the second capacitor component, the fourth capacitor component and the sixth capacitor component each include three identical capacitors, the first inductor component and the second inductor component each include three identical inductors, and the first-stage π-type filter circuit and the second-stage π-type filter circuit share the third capacitor component and the fourth capacitor component.

[0048] Depend on Figure 3As shown, the first capacitor component, the second capacitor component, the third capacitor component, the fourth capacitor component, the fifth capacitor component, the sixth capacitor component, and the first inductor component and the second inductor component are obtained by sorting from left to right, wherein the three capacitors included in the first capacitor component form a Y capacitor, the three capacitors included in the third capacitor component form a Y capacitor, and the three capacitors included in the fifth capacitor component form a Y capacitor. The three capacitors included in the second capacitor component form an X capacitor, the three capacitors included in the fourth capacitor component form an X capacitor, and the three capacitors included in the sixth capacitor component form an X capacitor.

[0049] The first capacitor component as a Y capacitor, the first inductor component and the third capacitor component as a Y capacitor constitute a first-stage π-type common-mode filter module in the first-stage π-type filter circuit, and the second capacitor component as an X capacitor, the first inductor component and the fourth capacitor component as an X capacitor constitute a first-stage π-type differential-mode filter module in the first-stage π-type filter circuit.

[0050] The third capacitor component as a Y capacitor, the second inductor component and the fifth capacitor component as a Y capacitor constitute a second-stage π-type common-mode filter module in the second-stage π-type filter circuit, and the fourth capacitor component as an X capacitor, the second inductor component and the sixth capacitor component as an X capacitor constitute a second-stage π-type differential-mode filter module in the second-stage π-type filter circuit.

[0051] based on Figure 3From the circuit structure shown, it can be seen that the connection relationship between the first capacitor component, the second capacitor component, the third capacitor component, the fourth capacitor component, the fifth capacitor component, the sixth capacitor component, and the first inductor component and the second inductor component is that: the three capacitors of the second capacitor component are respectively connected between the corresponding three phase lines A, B and C and the ground, that is, the first capacitor in the second capacitor component is connected between the phase line A and the ground, the second capacitor is connected between the phase line B and the ground, and the third capacitor is connected between the phase line C and the ground; the first capacitor of the three capacitors of the first capacitor component is connected between the two phase lines A and B, the second capacitor is connected between the two phase lines B and C, and the third capacitor is connected between the two phase lines A and C, and the three phase lines A, B and C are respectively connected to the three capacitors of the first inductor component. The first ends of the three inductors of the first inductor assembly are connected to the corresponding first ends of the three inductors, that is, the phase line A is connected to the first end of the first inductor of the first inductor assembly, the phase line B is connected to the first end of the second inductor of the first inductor assembly, and the phase line C is connected to the first end of the third inductor of the first inductor assembly; the three capacitors of the fourth capacitor assembly are respectively connected between the corresponding second ends of the three inductors of the first inductor assembly and the ground, that is, the first capacitor of the fourth capacitor assembly is connected between the second end of the first inductor of the first inductor assembly and the ground, the second capacitor of the fourth capacitor assembly is connected between the second end of the second inductor of the first inductor assembly and the ground, and the third capacitor of the fourth capacitor assembly is connected between the second end of the third inductor of the first inductor assembly and the ground; the second ends of the three inductors of the first inductor assembly are also connected to The first ends of the three inductors of the second inductor assembly, that is, the second end of the first inductor in the first inductor assembly is connected to the first end of the first inductor in the second inductor assembly, the second end of the second inductor in the first inductor assembly is connected to the first end of the second inductor in the second inductor assembly, and the second end of the third inductor in the first inductor assembly is connected to the first end of the third inductor in the second inductor assembly; the three capacitors of the sixth capacitor assembly are respectively connected between the corresponding second ends of the three inductors in the second inductor assembly and the ground, that is, the first capacitor in the sixth capacitor assembly is connected between the second end of the first inductor in the second inductor assembly and the ground, the second capacitor in the sixth capacitor assembly is connected between the second end of the second inductor in the second inductor assembly and the ground, and the third capacitor in the sixth capacitor assembly is connected between the second end of the second inductor in the second inductor assembly and the ground. The third capacitor is connected between the second end of the third inductor in the second inductor component and the ground; the three capacitors of the third capacitor component are located between the second end of the first inductor component and the first end of the second inductor component, and the first capacitor in the third capacitor component is connected between the two phase lines A and B, the second capacitor is connected between the two phase lines B and C, and the third capacitor is connected between the two phase lines A and C. The corresponding second ends of the three inductors of the second inductor component are also connected to the corresponding output terminals, that is, the second end of the first inductor in the second inductor component is connected to the output terminal PFC_A, the second end of the second inductor in the second inductor component is connected to the output terminal PFC_B, and the second end of the third inductor in the second inductor component is connected to the output terminal PFC_C;The three capacitors of the fifth capacitor assembly are located between the second end of the second inductor assembly and the sixth capacitor assembly, and the first capacitor of the fifth capacitor assembly is connected between the two phase lines A and B, the second capacitor is connected between the two phase lines B and C, and the third capacitor is connected between the two phase lines A and C.;

[0052] The input EMI filter adopts a two-stage filtering structure to eliminate the differential mode interference and common mode interference of the three-phase AC. The three-phase AC first passes through the first stage π-type filter circuit to mainly filter out the differential mode interference of the low-frequency part; then passes through the second stage π-type filter circuit to mainly filter out the differential mode interference of the high-frequency part. The common mode interference is also handled in the same way, passing through two stages of π-type filter circuits to filter out the high-frequency and low-frequency parts.

[0053] Figure 4 This is the schematic diagram of the three-phase Vienna AC / DC circuit in the EMI filter.

[0054] Figure 4 The three-phase Vienna AC / DC circuit shown is a known circuit structure and will not be described in detail here. The three-phase Vienna AC / DC circuit converts three-phase AC380V into a flat DC650V. Compared with the three-phase full-bridge PWM rectifier circuit, the three-phase Vienna AC / DC circuit has the advantages of low cost, high efficiency, simple control, high reliability, no bridge arm direct-through danger, light weight, small size, small input current harmonics, and low output voltage ripple.

[0055] Figure 5 This is the schematic diagram of the high-frequency DC / DC circuit in the EMI filter.

[0056] Figure 5 The high-frequency DC / DC circuit shown is a known circuit structure and will not be described in detail here. The high-frequency DC / DC circuit adopts a phase-shifted full-bridge DC / DC topology to convert the DC650V output of the three-phase Vienna AC / DC circuit into a set output voltage of DC110V. The high-frequency DC / DC circuit adjusts the pulse width of the power device drive signal under the control of the pulse width modulation (PWM) circuit to achieve voltage regulation. The DC / DC circuit based on the phase-shifted full-bridge has the advantages of simple structure, low switching loss, high efficiency, and low output current ripple.

[0057] In a preferred embodiment, the rectifier further includes a comprehensive processing unit, which is used to collect the AC voltage, battery voltage, control bus voltage, combined bus voltage, control bus current, battery current, and switch input and switch output of the rod power system, and send the collected data to the system monitoring unit. The comprehensive processing unit can be implemented using existing technology.

[0058] The battery cabinet is connected to the output end of the rectifier, includes a battery pack, and may also include a battery pack balance monitor, etc. It can be implemented using existing technologies and will not be described in detail here.

[0059] The battery pack of the rod power system is connected to the load through a parallel output cabinet, and the battery pack is in a charging and discharging state for a long time.

[0060] According to the actual use scenario and requirements, the output specification of a single rectifier is selected as DC110V / 500A. Considering that when two AC inputs are powered off and one of the two battery groups is under maintenance, only one battery group is working, it must meet the requirement of full load operation for 5s. According to this requirement and the reliability of the output voltage of the power supply system, 2V single cells are selected. When a 2V single cell is damaged, it will not cause a large fluctuation in the output voltage.

[0061] The main function of the battery pack balance monitor is to monitor the voltage of the battery cells. At the same time, through the comparison of the monitoring module, an alarm is issued for abnormal cell voltage. This can be achieved using existing technology.

[0062] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, some simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the scope of protection determined by the claims submitted for the present invention.

Claims

1. A highly reliable rod power supply system, comprising: 2 rectifiers, 2 battery cabinets, 1 parallel output cabinet, and 1 system monitoring unit. The output end of the 1 rectifier is electrically connected to the 1 battery cabinet to form a power supply circuit. The output ends of the 2 rectifiers and the output ends of the 2 battery cabinets are electrically connected to the parallel output cabinet, which is electrically connected to the load. The system monitoring unit is used to monitor and control the operating status of the rectifier, the battery cabinet, and the parallel output cabinet in real time. The rectifier comprises: a dual power switching unit and a rectifying unit, wherein the dual power switching unit is connected to two external AC power supplies and is electrically connected to the rectifying unit, and the output end of the rectifying unit is the output end of the rectifier; The parallel output cabinet comprises two DC / DC voltage stabilizing units, two anti-backflow diodes, three isolating knife switches and a DC insulation monitoring unit, wherein one DC / DC voltage stabilizing unit, one anti-backflow diode and one isolating knife switch are connected in series into one branch, thereby forming two branches, the two branches are connected in parallel and connected in series with the DC insulation monitoring unit and the third isolating knife switch, and the DC insulation monitoring unit is located between the two parallel branches and the third isolating knife switch.

2. The high-reliability rod power supply system according to claim 1, characterized in that: The rectifier also includes a comprehensive processing unit, which is used to collect the AC voltage, battery voltage, control mother voltage, combined mother voltage, control mother current, battery current, and switch input and switch output of the rod power system, and send the collected data to the system monitoring unit.

3. The high-reliability rod power supply system according to claim 1, characterized in that: The rectifier unit adopts multiple parallel AC / DC modules, and each AC / DC module includes: an input EMI filter, a three-phase Vienna AC / DC circuit, a high-frequency DC / DC circuit, an output filter circuit, and a control circuit, wherein the input end of the input EMI filter is connected to a 380V three-phase alternating current, the output end of the input EMI filter is electrically connected to the input end of the three-phase Vienna AC / DC circuit, the output end of the three-phase Vienna AC / DC circuit is connected to the input end of the high-frequency DC / DC circuit, the output end of the high-frequency DC / DC circuit is connected to the input end of the output filter circuit, the output end of the filter circuit outputs a 110V DC voltage, the control circuit is respectively connected to an AC voltage of 380V and a DC voltage of 110V, and is respectively electrically connected to the three-phase Vienna AC / DC circuit and the high-frequency DC / DC circuit.

4. The high-reliability rod power supply system according to claim 3, characterized in that: The input EMI filter comprises: a first-stage π-type filter circuit and a second-stage π-type filter circuit connected in series, three phase lines A, B and C providing 380V three-phase AC power are respectively connected to the first-stage π-type filter circuit, the first-stage π-type filter circuit comprises: a first capacitor component, a second capacitor component, a third capacitor component, a fourth capacitor component and a first inductor component, the second-stage π-type filter circuit comprises: a third capacitor component, a fourth capacitor component, a fifth capacitor component, a sixth capacitor component and a second inductor component, wherein: the first capacitor component, the third capacitor component and the fifth capacitor component each include three identical capacitors, the second capacitor component, the fourth capacitor component and the sixth capacitor component each include three identical capacitors, the first inductor component and the second inductor component each include three identical inductors, and the first-stage π-type filter circuit and the second-stage π-type filter circuit share the third capacitor component and the fourth capacitor component.

5. The high-reliability rod power supply system according to claim 4, characterized in that: The three capacitors of the second capacitor assembly are respectively connected between the corresponding three phase lines A, B and C and the ground. The first capacitor of the three capacitors of the first capacitor assembly is connected between the two phase lines A and B, the second capacitor is connected between the two phase lines B and C, and the third capacitor is connected between the two phase lines A and C. The three phase lines A, B and C are respectively connected to the corresponding first ends of the three inductors of the first inductor assembly. The three capacitors of the fourth capacitor assembly are respectively connected between the corresponding second ends of the three inductors in the first inductor assembly and the ground. The respective second ends of the three inductors of the first inductor assembly are also connected to the respective first ends of the three inductors of the second inductor assembly. The three capacitors of the sixth capacitor assembly are respectively connected to the three inductors in the second inductor assembly. The corresponding second ends of the three inductors of the second inductor component are also connected to the corresponding output terminals, the three capacitors of the fifth capacitor component are located between the second end of the second inductor component and the ground, the three capacitors of the third capacitor component are located between the second end of the first inductor component and the first end of the second inductor component, and the first capacitor in the third capacitor component is connected between the two phase lines A and B, the second capacitor is connected between the two phase lines B and C, and the third capacitor is connected between the two phase lines A and C. The corresponding second ends of the three inductors of the second inductor component are also connected to the corresponding output terminals, the three capacitors of the fifth capacitor component are located between the second end of the second inductor component and the sixth capacitor component, and the first capacitor in the fifth capacitor component is connected between the two phase lines A and B, the second capacitor is connected between the two phase lines B and C, and the third capacitor is connected between the two phase lines A and C.

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