Control power supply circuit of generator excitation system
By constructing the control power supply circuit of the excitation system of a nuclear power plant and adopting a circuit design composed of isolation modules and voltage stabilizing modules, the problems of single-point grounding and insufficient redundancy in the control power supply design of the excitation system are solved. This achieves the independence and redundancy of the excitation power supply circuit, avoids the risk of tripping, and improves the reliability of the system.
Patent Information
- Application Number
- CN202520058187.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-01-09
AI Technical Summary
The existing control power supply design of the excitation system in nuclear power plants has problems such as single-point grounding, non-independent channel power supply configuration, and insufficient power redundancy, which lead to the risk of tripping. The control power supply design of the excitation system needs to be improved to ensure independence and redundancy.
The control power supply circuit of the generator excitation system is constructed, including an isolation module, a power coupling module, a voltage stabilizing module, a connection module, a power distribution module, and a main control module. Electrical isolation is achieved through multiple isolation transformers to prevent cross-current circuits, increase redundant power supply, and facilitate online maintenance through air switches and terminal blocks.
Achieving complete independence of the excitation power supply circuit avoids the risk of tripping due to single-point grounding, ensures the independence and redundancy of the control power supply and important load power supply of the excitation system channel, and improves system reliability.
Smart Images
Figure CN223829245U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of excitation systems for nuclear power plant units, and more specifically, to a control power supply circuit for a generator excitation system. Background Technology
[0002] The excitation system of a nuclear power plant unit provides direct current to the field windings of a synchronous generator, directly affecting the stable operation of the generator. The reliability of the generator excitation system equipment directly affects the stable operation of the generator; a superior excitation regulation system can not only ensure the safe operation of the generator but also improve the stability of the power system.
[0003] In recent years, nuclear power plants have experienced numerous failures, trips, or reactor trips caused by design flaws in the excitation power supply circuit. The excitation system power supply design suffers from numerous hidden dangers that pose trip risks, such as single-point grounding, non-independent power supply configurations for different channels, and insufficient power redundancy. Therefore, it is necessary to improve the design of the generator excitation system's control power supply to ensure the independence and redundancy of the control power supply, critical load power supply, and common load power supply for the excitation system channels. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a control power supply circuit for a generator excitation system, addressing the problems existing in the prior art.
[0005] The technical solution adopted by this utility model to solve its technical problem is: to construct a control power supply circuit for a generator excitation system, including: an isolation module, a power coupling module, a voltage stabilizing module, a connection module, a power distribution module, a main control module, and an input / output module;
[0006] The input terminal of the isolation module is connected to the secondary winding of the excitation transformer of the excitation system, the output terminal of the isolation module is connected to the power coupling module, the input terminal of the voltage regulator module is connected to the power coupling module, the output terminal of the voltage regulator module is connected to the power distribution module through the connection module, and the main control module and the input / output module are respectively connected to the power distribution module.
[0007] The isolation module includes multiple isolation transformers, and the multiple isolation transformers prevent the formation of series circuits;
[0008] The power coupling module is used to couple the three input power supplies.
[0009] The voltage regulator module is used to output a stable DC voltage based on the power signal output by the power coupling module;
[0010] The connection module is used to connect the voltage regulator module and the power distribution module;
[0011] The power distribution module is used to distribute power downstream;
[0012] The main control module is used to perform measurement, PID adjustment and control of the excitation system, and the main control module is powered by the power distribution module.
[0013] The input / output module is used to input / output analog or digital signals, and the input / output module is powered by the backup output interface of the power distribution module.
[0014] In the control power supply circuit of the generator excitation system of this utility model, the isolation module includes: a first isolation transformer and a second isolation transformer;
[0015] The primary winding of the first isolation transformer is connected to the secondary winding of the excitation transformer, and the secondary winding of the first isolation transformer is connected to the first sub-power supply coupling module.
[0016] The primary winding of the second isolation transformer is connected to the secondary winding of the excitation transformer, and the secondary winding of the second isolation transformer is connected to the second sub-power supply coupling module.
[0017] The control power supply circuit of the generator excitation system described in this utility model further includes: a first DC power supply, a second DC power supply, a first air switch, a second air switch, a third air switch, and a fourth air switch;
[0018] The first air switch is located between the first DC power supply and the first input terminal of the first sub-power supply coupling module; the second air switch is located between the second DC power supply and the first input terminal of the second sub-power supply coupling module; the third air switch is located between the secondary winding of the first isolation transformer and the second input terminal of the first sub-power supply coupling module; and the fourth air switch is located between the secondary winding of the second isolation transformer and the second input terminal of the second sub-power supply coupling module. The first and second output terminals of the first sub-power supply coupling module and the first and second output terminals of the second sub-power supply coupling module are independently connected to the voltage regulator module.
[0019] In the control power supply circuit of the generator excitation system described in this utility model, the power coupling module further includes a third output terminal, which is connected to the monitoring module under the plant power supply.
[0020] In the control power supply circuit of the generator excitation system of this utility model, the voltage stabilizing module includes: multiple voltage stabilizing power supplies, and the output terminal of each voltage stabilizing power supply is connected to the power distribution module through the connection module.
[0021] In the control power supply circuit of the generator excitation system of this utility model, the voltage stabilizing module includes: a first voltage stabilizing power supply, a second voltage stabilizing power supply, a third voltage stabilizing power supply and a fourth voltage stabilizing power supply;
[0022] The input terminal of the first regulated power supply is connected to the first output terminal of the first sub-power coupling module, and the output terminal of the first regulated power supply is connected to the connection module; the input terminal of the second regulated power supply is connected to the first output terminal of the second sub-power coupling module, and the output terminal of the second regulated power supply is connected to the connection module; the input terminal of the third regulated power supply is connected to the second output terminal of the first sub-power coupling module, and the output terminal of the third regulated power supply is connected to the connection module; the input terminal of the fourth regulated power supply is connected to the second output terminal of the second sub-power coupling module, and the output terminal of the fourth regulated power supply is connected to the connection module.
[0023] In the control power supply circuit of the generator excitation system of this utility model, the connection module includes: a first connection component, a second connection component, a third connection component, and a fourth connection component;
[0024] The input terminal of the first connection component is connected to the output terminal of the first regulated power supply, and the output terminal of the first connection component is connected to the power distribution module;
[0025] The input terminal of the second connection component is connected to the output terminal of the second regulated power supply, and the output terminal of the second connection component is connected to the power distribution module;
[0026] The input terminal of the third connection component is connected to the output terminal of the third regulated power supply, and the output terminal of the third connection component is connected to the power distribution module.
[0027] The input terminal of the fourth connection component is connected to the output terminal of the fourth regulated power supply, and the output terminal of the fourth connection component is connected to the power distribution module.
[0028] In the control power supply circuit of the generator excitation system of this utility model, the first connection component includes: a first connection switch and a first terminal block; the second connection component includes: a second connection switch and a second terminal block; the third connection component includes: a third connection switch and a third terminal block; and the fourth connection component includes: a fourth connection switch and a fourth terminal block.
[0029] The input terminal of the first connection switch is connected to the output terminal of the first regulated power supply, and the output terminal of the first connection switch is connected to the power distribution module through the first terminal block;
[0030] The input terminal of the second connection switch is connected to the output terminal of the second regulated power supply, and the output terminal of the second connection switch is connected to the power distribution module through the second terminal block;
[0031] The input terminal of the third connection switch is connected to the output terminal of the third regulated power supply, and the output terminal of the third connection switch is connected to the power distribution module through the third terminal block;
[0032] The input terminal of the fourth connection switch is connected to the output terminal of the fourth regulated power supply, and the output terminal of the fourth connection switch is connected to the power distribution module through the fourth terminal block.
[0033] In the control power supply circuit of the generator excitation system described in this utility model, the first connection switch, the second connection switch, the third connection switch and the fourth connection switch are air switches.
[0034] The control power supply circuit of the generator excitation system implementing this utility model has the following beneficial effects: it includes an isolation module, a power coupling module, a voltage stabilizing module, a connection module, a power distribution module, a main control module, and an input / output module; the input terminal of the isolation module is connected to the secondary winding of the excitation transformer of the excitation system, the output terminal of the isolation module is connected to the power coupling module, the input terminal of the voltage stabilizing module is connected to the power coupling module, the output terminal of the voltage stabilizing module is connected to the power distribution module through the connection module, and the input / output module is connected to the power distribution module; the isolation module includes multiple isolation transformers, and the multiple isolation transformers prevent the formation of series circuits; the input / output module is powered by the spare output interface of the power distribution module. This utility model can achieve complete independence of the excitation power supply circuit, effectively avoid the risk of tripping due to single-point grounding, and ensure the independence and redundancy of the control power supply, important load power supply, and common load power supply of the excitation system channel. Attached Figure Description
[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:
[0036] Figure 1 This is a schematic block diagram of the control power supply circuit of the generator excitation system provided by this utility model;
[0037] Figure 2 This is a circuit diagram of the control power supply circuit for the generator excitation system provided by this utility model. Detailed Implementation
[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0039] To address the issues of DC circuit crosstalk and lack of independence of control channels and power supply for critical loads in existing excitation power supply designs, this invention provides a control power supply circuit for a generator excitation system. This circuit enables complete independence of the excitation power supply circuit and effectively avoids the risk of tripping due to single-point grounding.
[0040] refer to Figure 1 , Figure 1 A schematic diagram of the control power supply circuit for the generator excitation system provided by this utility model.
[0041] Specifically, such as Figure 1 As shown, the control power supply circuit of the generator excitation system includes: an isolation module 11, a power coupling module 12, a voltage stabilizing module 13, a connection module 14, a power distribution module 15, a main control module 16, and an input / output module 17.
[0042] The input terminal of isolation module 11 is connected to the secondary winding of excitation transformer 10 in the excitation system, and the output terminal of isolation module 11 is connected to power coupling module 12. The input terminal of voltage regulator module 13 is connected to power coupling module 12, and the output terminal of voltage regulator module 13 is connected to power distribution module 15 via connection module 14. Input / output module 17 is connected to power distribution module 15. Isolation module 11 includes multiple isolation transformers, which reduce the voltage of the secondary winding of the excitation transformer to the allowable input voltage of power coupling module 12, while simultaneously achieving electrical isolation between the two control power supply circuits and preventing the formation of cross-current loops.
[0043] In this embodiment of the invention, the power coupling module 12 is used to couple the three input power supplies; the voltage stabilizing module 13 is used to output a stable DC voltage based on the power signal output by the power coupling module 12; the connection module 14 is used to connect the voltage stabilizing module 13 and the power distribution module 15; the power distribution module 15 is used to distribute power downstream; the main control module 16 is used to perform measurement, PID regulation and control of the excitation system, and the main control module 16 is powered by the power distribution module 15; the input / output module 17 is used to input / output analog or digital signals, and the input / output module 17 is powered by the spare output interface of the power distribution module 15. Specifically, by adding an isolation transformer downstream of the excitation transformer 10 (i.e., the excitation transformer 10 in the generator static excitation system), the empirical feedback of DC circuit crosstalk can be effectively implemented, that is, the crosstalk circuit is isolated to avoid the phenomenon of DC circuit crosstalk. At the same time, the original power supply method of the input / output module 17 is eliminated, and the power is supplied by the spare output interface of the power distribution module 15.
[0044] In a preferred embodiment, such as Figure 2 As shown, the isolation module 11 includes: a first isolation transformer T61 and a second isolation transformer T62.
[0045] The primary winding of the first isolation transformer T61 is connected to the secondary winding of the excitation transformer 10, and the secondary winding of the first isolation transformer T61 is connected to the first sub-power supply coupling module; the primary winding of the second isolation transformer T62 is connected to the secondary winding of the excitation transformer 10, and the secondary winding of the second isolation transformer T62 is connected to the second sub-power supply coupling module.
[0046] In this embodiment, the control power supply circuit of the generator excitation system further includes: a first DC power supply, a second DC power supply, a first air switch Q80, a second air switch Q81, a third air switch Q61, and a fourth air switch Q62. Figure 2 In this design, 220V DC1 is the first DC power supply, 220V DC2 is the second DC power supply, V80 is the first sub-power supply coupling module, V81 is the second sub-power supply coupling module, and A10 / A20 / A30 is the main control module 16. The main control module 16 adopts the original design, and this utility model does not impose any specific limitations on it.
[0047] The first air switch Q80 is located between the first DC power supply and the first input terminal of the first sub-power supply coupling module V80. The second air switch Q81 is located between the second DC power supply and the first input terminal of the second sub-power supply coupling module V81. The third air switch Q61 is located between the secondary winding of the first isolation transformer T61 and the second input terminal of the first sub-power supply coupling module V80. The fourth air switch Q62 is located between the secondary winding of the second isolation transformer T62 and the second input terminal of the second sub-power supply coupling module V81. The first and second output terminals of the first sub-power supply coupling module V80 and the second sub-power supply coupling module V81 are independently connected to the voltage regulator module 13.
[0048] Furthermore, the power coupling module 12 also includes a third output terminal, which is connected to the monitoring module under the plant power supply. By connecting the monitoring module under the 220V plant power supply to the third output terminal (i.e., OUT3 of V80 and V81) of the power coupling module 12, the monitoring signal under the 220V plant power supply can be moved to OUT3 of the first sub-power coupling module V80 and the second sub-power coupling module V81, thereby increasing the redundancy of the power supply.
[0049] In this embodiment of the present invention, the voltage regulator module 13 includes multiple voltage regulators, and the output terminal of each voltage regulator is connected to the power distribution module 15 through the connection module 14.
[0050] In a preferred embodiment, the voltage regulator module 13 includes: a first voltage regulator G80, a second voltage regulator G81, a third voltage regulator G80 (G83) and a fourth voltage regulator G81 (G84).
[0051] The input terminal of the first regulated power supply G80 is connected to the first output terminal of the first sub-power coupling module V80, and the output terminal of the first regulated power supply G80 is connected to the connection module 14; the input terminal of the second regulated power supply G81 is connected to the first output terminal of the second sub-power coupling module V81, and the output terminal of the second regulated power supply G81 is connected to the connection module 14; the input terminal of the third regulated power supply G80 (G83) is connected to the second output terminal of the first sub-power coupling module V80, and the output terminal of the third regulated power supply G80 (G83) is connected to the connection module 14; the input terminal of the fourth regulated power supply G81 (G84) is connected to the second output terminal of the second sub-power coupling module V81, and the output terminal of the fourth regulated power supply G81 (G84) is connected to the connection module 14.
[0052] In this embodiment of the present invention, the connection module 14 includes: a first connection component, a second connection component, a third connection component, and a fourth connection component.
[0053] The input terminal of the first connection component is connected to the output terminal of the first regulated power supply G80, and the output terminal of the first connection component is connected to the power distribution module 15; the input terminal of the second connection component is connected to the output terminal of the second regulated power supply G81, and the output terminal of the second connection component is connected to the power distribution module 15; the input terminal of the third connection component is connected to the output terminal of the third regulated power supply G80 (G83), and the output terminal of the third connection component is connected to the power distribution module 15; the input terminal of the fourth connection component is connected to the output terminal of the fourth regulated power supply G81 (G84), and the output terminal of the fourth connection component is connected to the power distribution module 15. Figure 2 In this diagram, Q80* (i.e., Q801, Q802, Q803, Q811, Q812, Q813) are the power distributors in the power distribution module. Each power distributor has 4 channels, or 4 output interfaces, which can be operated independently and have their operating current set independently. Figure 2 In this configuration, A51, A53, A54, A55, and A56 are five input / output boards (i.e., five input / output modules). These input / output boards (CIO boards) provide the necessary general analog and digital interfaces for the excitation control system, enabling analog and digital input / output. Figure 2 The CCI in the text refers to the rectifier bridge control interface board, which can be used to collect relevant data from the rectifier bridge and can also serve as the control interface for the main control board.
[0054] Optionally, in this embodiment of the present invention, the first connection component includes: a first connection switch K81 and a first terminal block; the second connection component includes: a second connection switch K82 and a second terminal block; the third connection component includes: a third connection switch K83 and a third terminal block; and the fourth connection component includes: a fourth connection switch K84 and a fourth terminal block. The input terminal of the first connection switch K81 is connected to the output terminal of the first regulated power supply G80, and the output terminal of the first connection switch K81 is connected to the power distribution module 15 via the first terminal block; the input terminal of the second connection switch K82 is connected to the output terminal of the second regulated power supply G81, and the output terminal of the second connection switch K82 is connected to the power distribution module 15 via the second terminal block; the input terminal of the third connection switch K83 is connected to the output terminal of the third regulated power supply G83, and the output terminal of the third connection switch K83 is connected to the power distribution module 15 via the third terminal block; the input terminal of the fourth connection switch K84 is connected to the output terminal of the fourth regulated power supply G81 (G84), and the output terminal of the fourth connection switch K84 is connected to the power distribution module 15 via the fourth terminal block.
[0055] Optionally, in this embodiment of the present invention, the first connecting switch K81, the second connecting switch K82, the third connecting switch K83, and the fourth connecting switch K84 are air switches.
[0056] Specifically, this utility model facilitates online maintenance of the system by adding an air switch and terminals (i.e., terminal blocks) between the regulated power supply and the power distributor, effectively solving the problem of inconvenient maintenance in the existing design.
[0057] like Figure 2 As shown, this utility model adds a transformer T62 downstream of the excitation transformer 10, which connects the three input power supplies of the excitation regulator (i.e., the first DC power supply, the second DC power supply, and the secondary side of the excitation transformer 10) through the first sub-power supply coupling module V80 and the second sub-power supply coupling module V81, and realizes electrical isolation between the two control power supply circuits, effectively avoiding the occurrence of DC circuit cross-current. The monitoring signal under the 220V plant power supply is moved to OUT3 of the first sub-power supply coupling module V80 and the second sub-power supply coupling module V81, increasing the redundant power supply. By adding an air switch and terminal between the G8* series and the Q80* series, online maintenance is facilitated. The termination piece between Q801 and Q802 is removed. The regulated power supply of G8* is connected to the air switch and terminal respectively through the termination. The original power supply method of CIO is removed. Except for A51, the four CIO boards (i.e., input / output modules 17) are powered by the spare output interface of the power distributor.
[0058] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They do not limit the scope of protection of this utility model. All equivalent changes and modifications made within the scope of the claims of this utility model should fall within the scope of the claims of this utility model.
Claims
1. A control power supply circuit for an excitation system of an electric generator, characterized by The application relates to a power supply system for an excitation system, which comprises an isolation module, a power supply coupling module, a voltage stabilizing module, a connecting module, a power supply distribution module, a main control module and an input / output module. The input end of the isolation module is connected with the secondary winding of an excitation transformer of the excitation system, the output end of the isolation module is connected with the power supply coupling module, the input end of the voltage stabilizing module is connected with the power supply coupling module, the output end of the voltage stabilizing module is connected with the power supply distribution module through the connecting module, and the main control module and the input / output module are respectively connected with the power supply distribution module. The isolation module comprises a plurality of isolation transformers, and the plurality of isolation transformers prevent the formation of a series electric circuit. The power supply coupling module is used for coupling three input power supplies. The voltage stabilizing module is used for outputting stable direct-current voltage based on the power supply signal output by the power supply coupling module. The connecting module is used for connecting the voltage stabilizing module and the power supply distribution module. The power supply distribution module is used for distributing power supply to downstream. The main control module is used for performing measurement, PID adjustment and control on the excitation system, and the main control module is provided with electric energy by the power supply distribution module. The input / output module is used for inputting / outputting analog signals or digital signals, and the input / output module is provided with electric energy by a standby output interface of the power supply distribution module. The isolation module comprises a first isolation transformer and a second isolation transformer.
2. The control power supply circuit of an excitation system of a generator according to claim 1, characterized by The primary winding of the first isolation transformer is connected with the secondary winding of the excitation transformer, and the secondary winding of the first isolation transformer is connected with the first sub power supply coupling module. The primary winding of the second isolation transformer is connected with the secondary winding of the excitation transformer, and the secondary winding of the second isolation transformer is connected with the second sub power supply coupling module. The application further comprises a first direct-current power supply, a second direct-current power supply, a first air switch, a second air switch, a third air switch and a fourth air switch.
3. The control power supply circuit of an excitation system of a generator according to claim 2, characterized by, The first air switch is arranged between the first direct-current power supply and the first input end of the first sub power supply coupling module, the second air switch is arranged between the second direct-current power supply and the first input end of the second sub power supply coupling module, the third air switch is arranged between the secondary winding of the first isolation transformer and the second input end of the first sub power supply coupling module, the fourth air switch is arranged between the secondary winding of the second isolation transformer and the second input end of the second sub power supply coupling module, and the first and second output ends of the first sub power supply coupling module and the first and second output ends of the second sub power supply coupling module are respectively independently connected with the voltage stabilizing module. The power supply coupling module further comprises a third output end, and the third output end of the power supply coupling module is connected with a monitoring module under factory power.
4. The control power supply circuit of an excitation system of a generator according to claim 3, characterized by The voltage stabilizing module comprises a plurality of voltage stabilizing power supplies, and the output end of each voltage stabilizing power supply is connected with the power supply distribution module through the connecting module.
5. The control power supply circuit of an excitation system of a generator according to claim 1, characterized by, The voltage stabilizing module comprises a first voltage stabilizing power supply, a second voltage stabilizing power supply, a third voltage stabilizing power supply and a fourth voltage stabilizing power supply.
6. The control power supply circuit of an excitation system of a generator according to claim 3, characterized by The input end of the first voltage stabilizing power supply is connected with the first output end of the first sub-power supply coupling module, and the output end of the first voltage stabilizing power supply is connected with the connecting module; the input end of the second voltage stabilizing power supply is connected with the first output end of the second sub-power supply coupling module, and the output end of the second voltage stabilizing power supply is connected with the connecting module; the input end of the third voltage stabilizing power supply is connected with the second output end of the first sub-power supply coupling module, and the output end of the third voltage stabilizing power supply is connected with the connecting module; the input end of the fourth voltage stabilizing power supply is connected with the second output end of the second sub-power supply coupling module, and the output end of the fourth voltage stabilizing power supply is connected with the connecting module.
7. The control power supply circuit of an excitation system of a generator according to claim 6, characterized by The connecting module comprises a first connecting component, a second connecting component, a third connecting component and a fourth connecting component. The input end of the first connecting component is connected with the output end of the first voltage stabilizing power supply, and the output end of the first connecting component is connected with the power supply distribution module. The input end of the second connecting component is connected with the output end of the second voltage stabilizing power supply, and the output end of the second connecting component is connected with the power supply distribution module. The input end of the third connecting component is connected with the output end of the third voltage stabilizing power supply, and the output end of the third connecting component is connected with the power supply distribution module. The input end of the fourth connecting component is connected with the output end of the fourth voltage stabilizing power supply, and the output end of the fourth connecting component is connected with the power supply distribution module.
8. The control power supply circuit of an excitation system of a generator according to claim 7, characterized by, The first connecting component comprises a first connecting switch and a first terminal row; the second connecting component comprises a second connecting switch and a second terminal row; the third connecting component comprises a third connecting switch and a third terminal row; and the fourth connecting component comprises a fourth connecting switch and a fourth terminal row. The input end of the first connecting switch is connected with the output end of the first voltage stabilizing power supply, and the output end of the first connecting switch is connected with the power supply distribution module through the first terminal row. The input end of the second connecting switch is connected with the output end of the second voltage stabilizing power supply, and the output end of the second connecting switch is connected with the power supply distribution module through the second terminal row. The input end of the third connecting switch is connected with the output end of the third voltage stabilizing power supply, and the output end of the third connecting switch is connected with the power supply distribution module through the third terminal row. The input end of the fourth connecting switch is connected with the output end of the fourth voltage stabilizing power supply, and the output end of the fourth connecting switch is connected with the power supply distribution module through the fourth terminal row.
9. The control power supply circuit of an excitation system of a generator according to claim 8, characterized by, The first connecting switch, the second connecting switch, the third connecting switch and the fourth connecting switch are air switches.