Electric power system synchronization control circuit

Abstract

The invention relates to the technical field of electric power systems, in particular to an electric power system synchronous control circuit, which comprises a power generation boosting main loop which comprises a power generator, a main transformer and a bus and is used for realizing electric energy production, voltage conversion and ultrahigh-voltage grid-connected transmission; the voltage acquisition loop comprises a first voltage acquisition sub-loop and a second voltage acquisition sub-loop, and the first voltage acquisition sub-loop is provided with a plurality of groups of buses and voltage transformers and is used for acquiring bus system side voltage signals and converging and transmitting the voltage signals; the second voltage acquisition sub-loop is provided with a generator-side voltage transformer and a branch switch and is used for acquiring and transmitting a generator-side voltage signal; in a signal acquisition link, a double-bus and spacing line collaborative sampling architecture is adopted, independent voltage acquisition is carried out on a first bus, a second bus and an associated spacing line through a voltage transformer, and full-domain voltage signal coverage of a bus body, an auxiliary spacing line and generator output is realized in cooperation with redundant design of a generator-side double-branch branch wire and a switch.

Description

Technical Field

[0001] This invention relates to the field of power system technology, and in particular to a power system synchronization control circuit. Background Technology

[0002] In the field of power system synchronization control, generator grid connection is a crucial link in ensuring a stable power supply. Existing technologies typically include generator and voltage boosting equipment, voltage acquisition circuits, synchronization signal transfer units, and automatic synchronizing devices. By acquiring voltage, frequency, and phase signals from both the generator and system sides, they determine grid connection conditions and execute closing operations to achieve smooth generator grid connection. This architecture has been widely used in traditional thermal power and new energy power generation scenarios, providing fundamental technical support for power system synchronization control.

[0003] However, existing synchronization control circuits have significant shortcomings in signal transmission accuracy: multi-source signals (such as bus-side and generator-side voltage signals) are susceptible to electromagnetic interference during acquisition and switching, and lack sophisticated filtering and conditioning designs, resulting in harmonic distortion and phase deviation in the signals received by the automatic synchronizing device. This can cause errors in the device's determination of grid connection conditions (voltage difference, frequency difference, phase difference), increase the risk of inrush current during generator grid connection, potentially damage critical equipment such as generators and circuit breakers, reduce the reliability and stability of power system synchronization control, and make it difficult to meet the stringent requirements for grid connection accuracy in complex power grid environments. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is that the existing circuit lacks a refined filtering and conditioning design for signal acquisition and conversion. Multi-source signals are easily affected by electromagnetic interference, resulting in harmonic distortion and phase deviation. This leads to large errors in the automatic synchronizing device's determination of grid connection conditions, increases the risk of generator grid connection inrush current, reduces the reliability and stability of system synchronization control, and makes it difficult to adapt to the precise grid connection requirements of complex power grids.

[0005] The above-mentioned technical problems are solved by the following technical solution: The present invention proposes a power system synchronization control circuit, including a power generation step-up main circuit, comprising a generator, a main transformer and a bus, for realizing power generation, voltage transformation and ultra-high voltage grid transmission;

[0006] The voltage acquisition circuit includes a first voltage acquisition sub-circuit and a second voltage acquisition sub-circuit. The first voltage acquisition sub-circuit is configured with multiple sets of buses and voltage transformers to acquire and transmit voltage signals on the bus system side. The second voltage acquisition sub-circuit is configured with generator-side voltage transformers and branch switches to acquire and transmit generator-side voltage signals.

[0007] The synchronization signal transfer circuit aggregates the voltage signals from the bus side and the generator side through a synchronization conversion switch and transfers them to the automatic synchronizing device to achieve accurate transfer of multi-channel signals.

[0008] The automatic synchronizing device receives the voltage signal from the synchronization signal transfer circuit, determines the grid connection conditions, and outputs a closing command. It includes signal processing and control logic in both automatic and manual synchronization modes.

[0009] In a preferred embodiment of the power system synchronization control circuit of the present invention: the power generation boosting main circuit includes:

[0010] dynamo;

[0011] The main transformer, whose input terminal is electrically connected to the generator via a connecting wire;

[0012] The input terminal of the bus-side switch is electrically connected to the output terminal of the main transformer via a connecting wire two;

[0013] The first branch connecting wire and the second branch connecting wire are connected in parallel to the output terminal of the bus-side switch;

[0014] The first branch switch is connected in series on the first branch connecting wire, and the output terminal of the first branch switch is used to connect to the first busbar;

[0015] The second branch switch is connected in series on the second branch connecting wire, and the output terminal of the second branch switch is used to connect to the second busbar.

[0016] In a preferred embodiment of the power system synchronization control circuit of the present invention: the first voltage acquisition sub-circuit includes:

[0017] Voltage transformer 2 has its input terminal connected to the second busbar via connecting wire 3, and connected to the first spacer via connecting wire 4;

[0018] Voltage transformer one, its input terminal is connected to the first busbar through connecting wire five, and connected to the second bay line through connecting wire six;

[0019] Connecting wire seven and connecting wire eight are respectively connected to the output terminals of voltage transformer one and voltage transformer two;

[0020] Connecting wire nine has its input end connected to the output ends of connecting wire seven and connecting wire eight, and its output end is connected to the synchronous signal conversion circuit.

[0021] In a preferred embodiment of the power system synchronization control circuit of the present invention: the first voltage acquisition sub-circuit further includes:

[0022] Connecting wire 10, one end of which is connected to the first spacer wire;

[0023] Connect wire eleven, one end of which is connected to the second spacer wire;

[0024] Connecting wire twelve, the input end of which is connected to the other end of connecting wire ten and connecting wire eleven;

[0025] Synchronization switch one, wherein the output terminals of connecting wire nine and connecting wire twelve are both connected to the input terminal of synchronization switch one.

[0026] In a preferred embodiment of the power system synchronization control circuit of the present invention: the second voltage acquisition sub-circuit includes:

[0027] Connecting wire thirteen, one end of which is connected to connecting wire one;

[0028] Voltage transformer three, the input terminal of which is connected to the other end of the connecting wire thirteen;

[0029] The first generator-side branch connecting wire and the second generator-side branch connecting wire are connected in parallel to the output terminal of the voltage transformer three.

[0030] The third branch switch is connected in series on the branch connection wire of the first generator side;

[0031] The fourth branch switch is connected in series on the branch connection wire of the second generator side;

[0032] The output ends of the first generator-side branch connecting wire and the second generator-side branch connecting wire are both connected to the input end of the synchronization changeover switch.

[0033] In a preferred embodiment of the power system synchronization control circuit of the present invention: the synchronization signal transfer circuit includes: sub-switch one, sub-switch two, sub-switch three, and sub-switch four;

[0034] Connecting wire sixteen is connected between the first output terminal of the synchronous changeover switch one and the input terminal of the sub-changeover switch one;

[0035] Connecting wire seventeen is connected between the second output terminal of the synchronous changeover switch one and the input terminal of the sub-changeover switch two;

[0036] Connecting wire eighteen is connected between the third output terminal of the synchronous changeover switch one and the input terminal of the sub-changeover switch four;

[0037] Connecting wire nineteen is connected between the fourth output terminal of the synchronous changeover switch one and the input terminal of the sub-changeover switch three;

[0038] Wherein, the output terminal of sub-switch one is connected to terminal two of the automatic synchronizing device; the output terminal of sub-switch two is connected to terminal one of the automatic synchronizing device; the output terminal of sub-switch four is connected to terminal three of the automatic synchronizing device; and the output terminal of sub-switch three is connected to terminal four of the automatic synchronizing device.

[0039] In a preferred embodiment of the power system synchronization control circuit of the present invention: the synchronization signal transfer circuit further includes synchronization switch two and synchronization switch three;

[0040] Connecting wire twenty, one end of which is connected to connecting wire sixteen;

[0041] The other end of the connecting wire 20 is connected in sequence to the input terminal of the synchronization changeover switch 2 and the B0 terminal of the TBB synchronization signal adapter box;

[0042] Connecting wire twenty-one, one end of which is connected to connecting wire seventeen;

[0043] The other end of the connecting wire 21 is connected in sequence to the input terminal of the synchronization changeover switch 3 and the A0 terminal of the TBB synchronization signal adapter box.

[0044] In a preferred embodiment of the power system synchronization control circuit of the present invention, it further includes a manual synchronization control branch, which includes: a GLB isolation transformer having an X-end inlet, a Y-end inlet, an X-end outlet, and a Y-end outlet; synchronization changeover switch four and synchronization changeover switch five; voltage monitoring relay one and voltage monitoring relay two;

[0045] Connecting wire 22, one end of which is connected to connecting wire 18, and the other end of which is connected to the Y-terminal inlet of the GLB isolation transformer;

[0046] Connecting wire twenty-three, one end of which is connected to connecting wire nineteen, and the other end of which is connected to the X terminal inlet of the GLB isolation transformer;

[0047] Connecting wire 24, one end of which is connected to the X output port of the GLB isolation transformer, and the other end is connected to the input terminal of the synchronizing switch 4;

[0048] The output terminal of the fourth synchronization switch is connected to terminal A of the TBB synchronization signal adapter box.

[0049] Connecting wire 25, one end of which is connected to the Y output port of the GLB isolation transformer, and the other end is connected to the input terminal of the synchronization changeover switch 5;

[0050] The output terminal of the synchronization switch five is connected to the B terminal of the TBB synchronization signal adapter box.

[0051] Connecting wire twenty-six, one end of which is connected to connecting wire twenty-four;

[0052] Voltage loop wire one, one end of which is connected to the other end of the connecting wire twenty-six, and the other end of which is connected to the terminal of voltage monitoring relay one and the terminal of voltage monitoring relay two;

[0053] Voltage loop wire 2, one end of which is connected to the connecting wire 21, and the other end of which is connected to the terminal of voltage monitoring relay 1 and the terminal of voltage monitoring relay 2;

[0054] Connecting wire 27 has one end connected to connecting wire 25 and the other end connected to the node between the terminal of voltage monitoring relay 1 and the terminal of voltage monitoring relay 2.

[0055] In a preferred embodiment of the power system synchronization control circuit of the present invention: the automatic quasi-synchronization device includes a signal conditioning module; the signal conditioning module includes a filtering circuit and an amplification circuit; the input terminal of the filtering circuit is connected to the output terminal of the synchronization signal transfer circuit; the output terminal of the filtering circuit is connected to the input terminal of the amplification circuit; the output terminal of the amplification circuit is connected to the determination unit of the automatic quasi-synchronization device.

[0056] In a preferred embodiment of the power system synchronization control circuit of the present invention: electromagnetic compatibility protection structures are provided at the connection wires of the synchronization signal transfer circuit and at the connection points between the voltage transformer and the connection wires in the voltage acquisition circuit.

[0057] The electromagnetic compatibility protection structure includes:

[0058] Shielded cable, wrapped around the outside of the connecting wire;

[0059] A filter element is installed at the connection point between the voltage transformer and the connecting wire.

[0060] The beneficial effects of this invention are as follows: The power system synchronization control circuit provided in this application, through the adoption of a dual-bus and bay-line collaborative sampling architecture in the signal acquisition stage, independently acquires voltage from the first and second buses and associated bay lines using voltage transformers. Combined with the redundant design of the generator-side dual-branch conductors and switches, it achieves full-domain voltage signal coverage of the bus body, auxiliary bays, and generator output. Compared to the traditional single-channel acquisition mode, this design avoids multi-source signal aliasing interference, providing a more comprehensive and pure raw data benchmark for synchronization determination.

[0061] At the signal switching and processing level, the multi-channel precise scheduling mechanism of the synchronization switch can flexibly switch the signal paths on the bus side and generator side according to the needs of the automatic synchronizing device, solving the signal adaptation problem in multi-bus scenarios. The built-in signal conditioning module, through the coordinated work of filtering and amplification circuits, effectively filters out harmonic distortion and phase deviation generated during transmission, ensuring the waveform integrity and amplitude stability of the received signal. At the same time, the electromagnetic compatibility protection structure (shielded cables and filtering elements) suppresses electromagnetic interference throughout the entire signal acquisition and switching link, significantly improving the anti-interference capability of signal transmission and reducing the judgment error of the synchronizing device from the source.

[0062] The selective connection scheme between the main transformer and the double busbars supports the dynamic allocation of power transmission paths according to the grid load and operating status, improving the system dispatch flexibility. The manual synchronization control branch provides a reliable manual intervention channel when the automatic mode is abnormal through the coordination of the GLB isolation transformer and the voltage monitoring relay. The dual-mode control scheme with automatic as the main mode and manual redundancy enhances the system's fault tolerance under complex operating conditions. Attached Figure Description

[0063] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein:

[0064] Figure 1 A schematic diagram of the overall circuit of the present invention is shown;

[0065] Figure 2 A circuit diagram of the power generation boost main circuit and voltage acquisition circuit of the present invention is shown;

[0066] Figure 3 The circuit diagram of the automatic quasi-synchronization device and the manual synchronization control branch of the present invention is shown.

[0067] 100. Generator step-up main circuit; 101. Generator; 102. Main transformer; 103. Busbar group; 103a. First busbar; 103b. Second busbar; 103c. First bay line; 103d. Second bay line; 104. Busbar side switch; 200. Voltage acquisition circuit; 201. First voltage acquisition sub-circuit; 202. Second voltage acquisition sub-circuit; 300. Synchronization signal transfer circuit; 400. Automatic quasi-synchronization device; 500. Manual synchronization control branch;

[0068] 301a, Sub-switch 4; 301b, Sub-switch 3; 301c, Sub-switch 2; 301d, Sub-switch 1; 302a, Synchronization Switch 1; 302b, Synchronization Switch 2; 302c, Synchronization Switch 3; 302d, Synchronization Switch 4; 302e, Synchronization Switch 5; 303a, Signal Node 1; 303b, Signal Node 2; 304a, Voltage Loop Wire 1; 304b, Voltage Loop Wire 2;

[0069] 601a, Voltage Transformer 1; 601b, Voltage Transformer 2; 601c, Voltage Transformer 3; 602a, First Branch Switch; 602b, Second Branch Switch; 602c, Third Branch Switch; 602d, Fourth Branch Switch; 603, TBB Synchronization Signal Transfer Box; 604, GLB Isolation Transformer; 605a, Voltage Monitoring Relay 1; 605b, Voltage Monitoring Relay 2; 606a, Terminal 1 of Automatic Synchronization Device; 606b, Terminal 2 of Automatic Synchronization Device; 606c, Terminal 3 of Automatic Synchronization Device; 606d, Terminal 4 of Automatic Synchronization Device;

[0070] S1, Connecting wire one; S2, Connecting wire two; S21, First branch connecting wire; S22, Second branch connecting wire; S31, Connecting wire three; S32, Connecting wire four; S41, Connecting wire five; S42, Connecting wire six; S51, Connecting wire seven; S52, Connecting wire eight; S5, Connecting wire nine; S61, Connecting wire ten; S62, Connecting wire eleven; S6, Connecting wire twelve; S7, Connecting wire thirteen; S71, First generator side branch connecting wire; S72, Second generator side branch connecting wire; S81, Connecting wire sixteen; S82, Connecting wire seventeen; S83, Connecting wire eighteen; S84, Connecting wire nineteen; S91, Connecting wire twentieth; S92, Connecting wire twenty-one; S93, Connecting wire twenty-two; S94, Connecting wire twenty-three; S95, Connecting wire twenty-five; S96, Connecting wire twenty-four; S97, Connecting wire twenty-seven; S98, Connecting wire twenty-six. Detailed Implementation

[0071] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0072] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0073] Reference Figures 1-3 This embodiment provides a power system synchronization control circuit, including a power generation boosting main circuit 100, comprising a generator 101, a main transformer 102, and a busbar group 103 connected in sequence for power generation, voltage transformation, and ultra-high voltage grid connection transmission; a voltage acquisition circuit 200, comprising a first voltage acquisition sub-circuit 201 electrically connected to the busbar group 103, and a second voltage acquisition sub-circuit 202 electrically connected to the generator 101, wherein the first voltage acquisition sub-circuit 201 is used to acquire and transmit voltage signals from the busbar system side; the second voltage acquisition sub-circuit 202 is used to acquire and transmit voltage signals from the generator side; and a synchronization signal transfer circuit 300, comprising a synchronization changeover switch electrically connected to the second voltage acquisition sub-circuit 202, and an automatic quasi-synchronization device 400 electrically connected to the synchronization changeover switch; wherein the synchronization changeover switch is used to collect and transfer voltage signals from the busbar side and the generator side, and the automatic quasi-synchronization device 400 receives voltage signals from the synchronization signal transfer circuit 300, determines grid connection conditions, and outputs a closing command.

[0074] In this embodiment, the main power generation and voltage boosting circuit 100 integrates a generator 101, a main transformer 102, and a connecting busbar group 103. The low-voltage electrical energy (e.g., 10kV) output by the generator 101 is transformed by electromagnetic induction in the main transformer 102 (boosted to 330kV), and then the ultra-high voltage electrical energy is transmitted to the grid through the busbar group 103, thus constructing a complete circuit from "electricity generation to voltage transformation and then to grid-connected output".

[0075] The voltage acquisition circuit 200 adopts a dual-channel acquisition architecture for accurately acquiring voltage signals from the generator 101 side and the system bus side. The first voltage acquisition sub-circuit 201 is configured with bus group 103, including two 330kV bus groups, two bay lines, and voltage transformers 601a and 601a. ​​The voltage transformers, through electromagnetic induction, proportionally convert the high voltage (330kV) on the bus side into a low voltage signal (e.g., 100V). After signal aggregation, the signal is transmitted to subsequent modules, achieving accurate sampling and preprocessing of the system-side voltage. The second voltage acquisition sub-circuit 202 integrates the generator 101 side voltage transformer 601c and a branch switch. The voltage transformer acquires the low-voltage signal (e.g., 10kV) output from the generator 101. The branch switch enables multi-channel acquisition control, ensuring flexible acquisition and transmission of the voltage signal from the generator 101 side, providing raw data for synchronization determination.

[0076] The synchronization signal transfer circuit 300, with the synchronization changeover switch as its core, undertakes the functions of signal aggregation and transfer. Through the path selection of the changeover switch, the multi-source voltage signals from the system bus side and generator side are integrated and accurately transferred to the device port according to the input requirements of the automatic synchronizing device 400, realizing the orderly transmission of complex multi-channel signals and solving the adaptation problem of multi-source acquisition and unified processing of synchronization signals.

[0077] The automatic synchronizing device 400 receives the voltage signal transmitted by the synchronizing signal transfer circuit 300 and has built-in automatic / manual synchronizing dual-mode control logic. In automatic synchronizing mode, based on the acquired voltage signal, it automatically calculates the voltage difference, frequency difference, and phase difference between the generator 101 side and the system side. When the difference meets the grid connection conditions, it triggers a closing command output, achieving precise grid connection without human intervention. In manual synchronizing mode, it provides an intervention channel for maintenance personnel, supporting manual monitoring of the voltage signal and manual adjustment of synchronizing parameters. Under special operating conditions (such as automatic mode failure or testing and debugging), grid connection control can be completed manually, ensuring the flexibility and reliability of system operation.

[0078] Please see Figure 2 Specifically: In the main power generation and voltage boosting circuit 100, the generator 101 is connected to the main transformer 102 via connecting wire S1. The main transformer 102 is connected to the bus-side switch 104 via connecting wire S2, and then branches into two branches: the first branch connecting wire S21 and the second branch connecting wire S22. The first branch connecting wire S21 is equipped with a first branch switch 602a, which is used to connect the first bus 103a. The second branch connecting wire S22 is equipped with a second branch switch 602b, which is used to connect the second bus 103b, and is used to connect the main transformer 102 to the two bus groups 103.

[0079] In the synchronous control circuit of this power system, the branch connection design of the generator step-up main circuit 100 enables flexible and reliable connection between the main transformer 102 and the double busbar group 103. In the generator step-up main circuit 100, the electrical energy output from the generator 101 is transmitted to the main transformer 102 via connecting wire S1, completing the conversion from low-voltage (e.g., 10kV) to ultra-high-voltage (330kV) electrical energy. After the high-voltage side of the main transformer 102 is connected to the busbar side switch via connecting wire S2, it further branches into a first branch connecting wire S21 and a second branch connecting wire S22, forming the physical connection channel between the main transformer and the double busbar group 103.

[0080] Furthermore, the first branch connecting conductor S21 is equipped with a first branch switch 602a, which is directly connected to the first busbar 103a. When it is determined that the main transformer 102 needs to be connected to the first busbar 103a, the first branch switch 602a closes, realizing the directional transmission of power to the first busbar 103a; otherwise, it opens, cutting off the path and preventing power from being mistakenly transmitted. Similarly, the second branch connecting conductor S22 is equipped with a second branch switch 602b, corresponding to the second busbar 103b. Its working logic works in coordination with the second branch switch 602b, flexibly selecting the closing / opening state according to the grid operation requirements (such as load distribution of busbar group 103, maintenance switching), ensuring that the main transformer 102 can accurately connect to the second busbar 103b.

[0081] By employing a dual-path architecture—connecting the busbar side switch of conductor S2 to the first branch connecting conductor S21, and the first branch switch 602a to the first busbar 103a; or connecting the busbar side switch of conductor S2 to the second branch connecting conductor S22, and the second branch switch 602b to the second busbar 103b—the following functions are achieved: When there is a load difference in the 330kV double busbar group 103, by controlling the on / off state of the first branch switch 602a and the second branch switch 602b, the electrical energy output from the main transformer 102 can be directionally distributed to the busbar group 103 with a lighter load. For example, if the first busbar 103a has a high load and the second busbar 103b has a low load, the first branch switch 602a can be opened and the second branch switch 602b can be closed, allowing electrical energy to be preferentially transmitted to the second busbar 103b, thereby balancing the load of the double busbar group 103, optimizing the power distribution of the power grid, and improving the overall operating efficiency. If a busbar group 103 (such as the first busbar 103a) needs to be shut down for maintenance, the power from the main transformer 102 can be quickly switched to the second busbar 103b by opening the first branch switch 602a of the corresponding branch and closing the second branch switch 602b of the other branch. This ensures that the generator-boosting main circuit 100 can continue to supply power to the grid, preventing partial power outages caused by maintenance of a single busbar group 103 and enhancing the reliability and continuity of the system's power supply. When a short circuit or overvoltage fault occurs in a busbar group 103 (such as the first busbar 103a), the first branch switch 602a can be quickly opened, cutting off the electrical connection between the main transformer 102 and the faulty busbar group 103. This effectively prevents the fault from spreading to the main transformer 102 and generator 101, protecting the core equipment of the generator-boosting main circuit 100 (such as the main transformer and generator 101) through physical isolation and reducing the scope of the fault's impact.

[0082] Please see Figure 2 Specifically: In the first voltage acquisition sub-circuit 201, the second bus 103b is connected to voltage transformer 601b via connecting wire 3 S31, and the first interval line 103c is connected to voltage transformer 601b via connecting wire 4 S32; the first bus 103a is connected to voltage transformer 601a via connecting wire 5 S41, and the second interval line 103d is connected to voltage transformer 601a via connecting wire 6 S42; the output signals of voltage transformer 601a and voltage transformer 601b converge into connecting wire 9 S5 via connecting wire 7 S51 and connecting wire 8 S52, and are connected to the synchronization signal transfer circuit 300.

[0083] In the design of the first voltage acquisition sub-circuit 201 of the synchronization control circuit of this power system, a voltage sampling system adapted to the double busbar group 103 architecture is constructed by connecting and processing the signals of multiple busbar groups 103, bay lines, and voltage transformers. Specifically, the signal access of the double busbar group 103 and bay lines addresses the voltage monitoring requirements of the 330kV double busbar group 103 (first busbar 103a, second busbar 103b) and associated bay lines (first bay line 103c, second bay line 103d) in the power system. The sub-circuit adopts a dual busbar group 103 and a dual-interval independent sampling channel design. Specifically, the voltage signal of the second busbar 103b is directly connected to voltage transformer 601b via the third connecting wire. Simultaneously, the voltage signal of the first interval line 103c is also connected to voltage transformer 601b via connecting wire S32, allowing voltage transformer 601b to simultaneously acquire the voltage of the second busbar 103b and the associated voltage of the first interval line 103c, covering the voltage monitoring range of the busbar group 103 and its extended intervals. Similarly, the voltage signal of the first busbar 103a is connected to voltage transformer 601a via connecting wire S41, and the voltage signal of the second interval line 103d is connected to voltage transformer 601a via connecting wire S42, allowing voltage transformer 601a to simultaneously acquire the voltage of the first busbar 103a and the associated voltage of the second interval line 103d, achieving full-range voltage sensing of the dual busbar group 103 and its associated intervals.

[0084] Voltage transformer 601a and voltage transformer 601b, as core components for high-voltage to low-voltage conversion, convert 330kV high-voltage signals into 100V low-voltage signals based on the principle of electromagnetic induction (to meet the sampling requirements of the synchronization control device). Simultaneously, utilizing their electrical isolation characteristics, they disconnect the direct electrical connection between the high-voltage busbar group 103 and the secondary control circuit, ensuring the safe operation of the subsequent synchronization signal transfer circuit 300 and the automatic quasi-synchronization device 400, thus establishing a safe isolation between high-voltage sampling and low-voltage transmission at the hardware level.

[0085] The voltage signals from the first bus 103a and the second spacer 103d output by voltage transformer 601a are transmitted via connecting wire S51; the voltage signals from the second bus 103b and the first spacer 103c output by voltage transformer 601b are transmitted via connecting wire S52. The two signals are finally merged and connected to connecting wire S5, realizing the physical channel integration of four voltage signals from the dual busbar group 103 and the dual spacer. This convergence design is not a simple parallel connection of lines, but rather, based on the synchronous control requirements of the power system, it classifies the voltage signals of the double busbar group 103 and its associated bays into common sources—voltage transformer 1 601a focuses on the voltage associated with the first busbar 103a, voltage transformer 2 601b focuses on the voltage associated with the second busbar 103b, and after being transmitted separately through connecting wire 7 S51 and connecting wire 8 S52, the signal aggregation at the "busbar group 103" level is completed at connecting wire 9 S5, providing the synchronous control device with a clear voltage comparison group signal of the double busbar group 103, making it easier for the device to accurately determine "which busbar group 103 voltage is more matched with the voltage on the generator 101 side".

[0086] The combined voltage signal is connected to the synchronization signal transfer circuit 300 via connecting wire 9S5, becoming the input source of the synchronization changeover switch 302a. This enables deep coordination between the first voltage acquisition sub-circuit 201 and the "signal scheduling center" of the synchronization control: when the automatic quasi-synchronization device 400 needs to determine the grid connection conditions of the generator 101, it can flexibly select the associated voltage signal of the dual bus group 103 transmitted via connecting wire 9S5 through the synchronization changeover switch, and compare it with the signal of the second voltage acquisition sub-circuit 202, thus solving the problem of multiple bus groups 103. The core issue in scenario 03 is "which busbar group 103 to select as the grid connection reference"; at the same time, through the independent transmission of signals from the dual voltage transformers via connecting wire 7 S51 and connecting wire 8 S52, even if one voltage transformer (such as voltage transformer 1 601a) fails, the other (such as voltage transformer 2 601b) can still transmit the associated voltage signal of the second busbar 103b to the synchronizing device through connecting wire 8 S52 and connecting wire 9 S5, ensuring the redundancy of the synchronizing control function and improving the system's fault tolerance capability.

[0087] The design of the first voltage acquisition sub-circuit 201 in this system breaks through the limitations of traditional single busbar group 103, single voltage transformer or multi-busbar group 103 sampling without correlation. Through double busbar group 103, double-interval line full-area coverage sampling, voltage transformer group and converging conductor signal collaborative processing, it realizes full-area voltage monitoring, accurate signal comparison and enhanced system redundancy. Specifically, it not only collects the voltage of the bus group 103 itself, but also extends to the voltage of the interval lines, covering the full voltage scenario of the bus group 103 and auxiliary equipment that need to be referenced when the generator 101 is connected to the grid, providing more complete system-side voltage data for synchronization determination; through the design of dual voltage transformer groups and connecting conductors, a clear voltage comparison group of dual bus groups 103 is constructed, allowing the synchronization device to select the reference bus group 103 for grid connection as needed, solving the adaptation problem of synchronization control of multiple bus groups 103; the independent design of dual voltage transformers and multiple connecting conductors ensures that the transmission of voltage signals of some bus groups 103 can still be guaranteed when any equipment fails, avoiding complete failure of the synchronization control function and improving the reliability of power system synchronization grid connection.

[0088] Please see Figure 2 Specifically: In the first voltage acquisition sub-circuit 201, the first interval line 103c and the second interval line 103d output signals through connecting wire 10 S61 and connecting wire 11 S62 respectively. Connecting wire 10 S61 and connecting wire 11 S62 merge into connecting wire 12 S6. The signals from connecting wire 9 S5 and connecting wire 12 S6 are connected to the synchronous conversion switch 1 302a for the aggregation and conversion of multi-source signals on the bus side.

[0089] In the first voltage acquisition sub-loop 201 of the synchronization control circuit of this power system, the voltage signal processing for the first bay line 103c and the second bay line 103d is also constructed through wire connection and merging logic to build a signal acquisition and transfer system adapted to multi-bay line scenarios. For the first bay line 103c, its voltage signal is directionally transmitted through connecting wire + S61; the voltage signal of the second bay line 103d is independently exported through connecting wire eleven S62. This design of one dedicated wire per bay line can avoid interference between voltage signals of different bay lines in the initial stage of transmission, ensuring the "purity" of voltage data acquired from the source of the bay line, and providing accurate raw signals for subsequent synchronization control. Combining the configuration of voltage transformer 601a and voltage transformer 601b in the circuit, it can be seen that the bay line voltage signals transmitted by connecting wire + S61 and connecting wire eleven S62 are actually an extension and supplement to the acquisition range of the voltage transformers. The voltage of the first bay line 103c is transmitted via connecting wire S61, and can form a bus group 103 and bay line associated signal group with the voltage of the second bus 103b collected by voltage transformer 601b; the voltage of the second bay line 103d is transmitted via connecting wire S62, and can form another associated signal group with the voltage of the first bus 103a collected by voltage transformer 601a, so that the synchronization control device can obtain a more complete electrical status of the bus group 103 and the associated bays.

[0090] The interval line voltage signals transmitted by connecting conductors 10 (S61) and 11 (S62) ultimately converge into connecting conductor 12 (S6). This convergence is not a simple parallel connection of lines, but rather a categorization and aggregation of the dual-interval line voltage signals based on the power system's requirement for synchronous control and comprehensive voltage sensing on the bus side. Connecting conductor 12 (S6), as the converged channel, integrates the voltage information originally scattered across the two interval lines into a single signal stream with comparative value for dual-interval line voltages, providing the synchronous switching switch with richer bus-side voltage reference dimensions. The dual-bus group 103 and dual-interval line associated voltage signals transmitted by connecting conductor 9 (S5), together with the dual-interval line aggregated voltage signal transmitted by connecting conductor 12 (S6), are connected to the synchronous switching switch.

[0091] The synchronization switch 302a acts as the signal scheduling center, flexibly selecting bus-side voltage signals from different sources according to the judgment requirements of the automatic synchronizing device 400: when a comprehensive assessment of the overall voltage status of bus group 103 and bay lines is required, the associated signal group of connecting conductor nine S5 is retrieved; when focusing on the comparison of bay line voltages to assist in determining grid compatibility, the aggregated signal stream of connecting conductor twelve S6 is selected. This design of multi-signal source access and flexible scheduling solves the problem of on-demand sampling and accurate judgment of bus-side voltage by the synchronization control device in complex multi-bay line scenarios. Even if the voltage signal of a certain bay line or bus group 103 fluctuates or becomes abnormal, the continuity and reliability of synchronization judgment can be ensured by switching signal sources.

[0092] Please see Figure 2 Specifically: In the second voltage acquisition sub-circuit 202, connecting wire thirteen S7 connects to connecting wire one S1 and is connected to voltage transformer three 601c. After passing through voltage transformer three 601c, it is divided into two branches: the first generator side branch connecting wire S71 and the second generator side branch connecting wire S72. The first generator side branch connecting wire S71 and the second generator side branch connecting wire S72 are respectively configured with the third branch switch 602c and the fourth branch switch 602d. The branch signals are connected to the synchronizing conversion switch one 302a for branch acquisition and conversion of generator side voltage signals.

[0093] In the design of the second voltage acquisition sub-circuit 202 of the synchronization control circuit of this power system, a technical system was constructed around the requirements of accurate acquisition and flexible transfer of the voltage signal of generator 101, including main line power intake, transformer isolation, dual branch redundancy, and switch scheduling. The voltage acquisition of generator 101 starts from the connecting conductor S1 of the main line connecting generator 101 and main transformer 102. The signal is led out through connecting conductor S7 and connected to the voltage transformer on the generator 101 side. This choice of power intake location avoids interference from the voltage transformation link of main transformer 102, ensuring that the acquired signal truly reflects the voltage amplitude, frequency, and phase state of generator 101, providing a raw voltage reference "without transition processing" for synchronization control, and ensuring the accuracy of synchronization determination from the source.

[0094] The voltage transformer 3601c on the generator 101 side performs two core functions: voltage transformation and electrical isolation. First, it converts the medium-voltage output (e.g., 10kV) from generator 101 into a low-voltage signal (e.g., 100V) adapted to the secondary circuit, matching the sampling threshold of the automatic synchronizing device 400. Second, it uses electromagnetic induction to disconnect the direct electrical connection between the high-voltage side of generator 101 and the secondary control circuit, preventing high-voltage intrusion from damaging subsequent switches, transfer circuits, and the automatic synchronizing device 400, thus establishing safe isolation from high-voltage sampling to low-voltage transmission.

[0095] The voltage signal processed by voltage transformer 601c forms two independent transmission channels through the first generator-side branch connection wire S71 and the second generator-side branch connection wire S72, with each branch equipped with a third branch switch 602c and a fourth branch switch 602d. When one branch (such as the first generator-side branch connection wire S71) experiences signal interruption due to line damage or component failure, the other branch (the second generator-side branch connection wire S72) can continue transmitting the voltage signal by closing the corresponding switch (the fourth branch switch 602d). This dual-branch backup mechanism physically eliminates the risk of synchronization control failure caused by a single channel failure, ensuring the continuity of voltage acquisition on the generator 101 side and improving the system's fault tolerance capability in the face of sudden faults. Maintenance personnel can dynamically switch between single-channel and dual-channel data acquisition by controlling the on / off states of the third branch switch 602c and the fourth branch switch 602d. During the commissioning phase, both channels can be activated simultaneously to compare the consistency of the two signals and verify the reliability of the acquisition system. During stable operation, the backup channel can be shut down to reduce circuit energy consumption. During fault repair, the faulty branch switch can be disconnected to repair the S71 channel of the first generator side branch connection wire without affecting the normal operation of the other branch. This flexible scheduling capability allows the acquisition system to adapt to various working conditions such as commissioning, operation, and maintenance, improving the practicality of the project.

[0096] The two branch signals are ultimately connected to the synchronization transfer switch 302a, forming a comparison group with the system voltage signal acquired from the bus side for the generator 101 side and the system bus side. The synchronization transfer switch 302a can flexibly select either a single-channel or dual-channel generator 101 side voltage signal according to the judgment requirements of the automatic synchronizing device 400, and calculate the voltage difference, frequency difference, and phase difference with the system side signal. This collaborative design not only solves the problem of low fault tolerance of a single acquisition channel, but also improves the accuracy (dual-channel signals can be cross-verified, reducing the error impact of a single signal) and flexibility (adapting to judgment strategies under different operating conditions) of synchronization judgment through the complementarity and scheduling of the two branch signals, providing key technical support for the safe and stable grid connection of generator 101.

[0097] Please see Figure 3Specifically: In the synchronization signal conversion circuit 300, synchronization switch 1 302a is connected to sub-switch 1 301d via connecting wire 16 S81, and after conversion by sub-switch 1 301d, it is connected to terminal 2 606b of the automatic synchronizing device; synchronization switch 1 302a is connected to sub-switch 2 301c via connecting wire 17 S82, and after conversion by sub-switch 2 301c, it is connected to terminal 1 606a of the automatic synchronizing device; synchronization switch 1 302a is connected to sub-switch 4 301a via connecting wire 18 S83, and after conversion by sub-switch 4 301a, it is connected to terminal 3 606c of the automatic synchronizing device; synchronization switch 1 302a is connected to sub-switch 3 301b via connecting wire 19 S84, and after conversion by sub-switch 3 301b, it is connected to terminal 4 606d of the automatic synchronizing device; this is used for the conversion of multi-channel synchronization signals to the automatic synchronizing device 400.

[0098] In the synchronization control circuit of this power system, the synchronization transfer switch 302a serves as the core scheduling node for multi-source signals. It constructs a hierarchical signal transfer system with the sub-transfer switch and the automatic quasi-synchronization device 400 through four independent connecting wires. This design breaks through the traditional crude mode of single-path direct connection.

[0099] Firstly, the anti-interference design features multi-channel independent transmission: After the synchronous transfer switch 302a collects the voltage signals from the bus side and the generator 101 side, it connects to the sub-transfer switches 301d, 301c, 301a, and 301b respectively via connecting wires 16S81, 17S82, 18S83, and 19S84. This design achieves triple isolation: 1. Channel isolation: each signal occupies a dedicated wire (e.g., connecting wire 16S81 only transmits to sub-transfer switch 301d), avoiding interference. 1. To prevent crosstalk between different signals during transmission; 2. Electrical isolation: the switching mechanism of the sub-change switch can cut off a signal during maintenance or fault, preventing the fault from spreading to the synchronous changeover switch 302a or the device side; 3. Functional isolation: connecting wires 16S81, 17S82, 18S83, and 19S84 correspond to different signal sources on the system side and generator 101 side respectively (e.g., connecting wire 16S81 may be associated with the first bus 103a, and connecting wire 18S83 may be associated with the branch on the generator 101 side), clearly defining the signal attributes from the source.

[0100] Secondly, the precise mapping between the sub-change switches and the device terminals: the position configuration of the sub-change switches forms a strict one-to-one correspondence with the multiple terminals of the automatic synchronizing device 400: connecting wire 16 S81 to sub-change switch 1 301d and then to terminal 2 606b of the automatic synchronizing device: carrying the system-side reference voltage signal (such as the core voltage sampling of the 330kV bus group 103), as the "reference benchmark" for synchronization determination; connecting wire 17 S82 to sub-change switch 2 301c and then to terminal 1 606a of the automatic synchronizing device: transmitting system-side redundant voltage signals (such as the voltage associated with the interval line), used for cross-verification with the reference signal; connecting wire 18 S83 to sub-change switch 4 301a and then to terminal 3 606c of the automatic synchronizing device, and connecting wire 19 S84 to sub-change switch 3 301b and then to terminal 4 606d of the automatic synchronizing device: respectively corresponding to the dual-branch voltage signals on the generator 101 side, realizing bidirectional comparison of the generator 101 and bus group 103 systems. This mapping relationship is not a simple line connection, but a signal requirement design based on the synchronization control algorithm: the automatic quasi-synchronization device 400 can simultaneously acquire the main signal on the system side of the bus group 103, the redundant signal on the system side, and the dual branch signal on the generator 101 side through 4 terminals, and construct a four-dimensional signal comparison model, which greatly improves the accuracy of voltage difference, frequency difference, and phase difference determination.

[0101] Please see Figure 3 Specifically: In the synchronization signal transfer circuit 300, one end of the connecting wire 20 S91 is connected to the signal branch of the connecting wire 16 S81, and the other end is connected in sequence to the synchronization changeover switch 2 302b, and transferred to the B0 terminal of the TBB synchronization signal transfer box 603; one end of the connecting wire 21 S92 is connected to the signal branch of the connecting wire 17 S82, and the other end is connected in sequence to the synchronization changeover switch 3 302c, and transferred to the A0 terminal of the TBB synchronization signal transfer box 603; through dual signal transfer, it is used for the access of the generator side / system side voltage signal to the TBB synchronization signal transfer box 603.

[0102] It also includes a manual synchronization control branch 500, in which one end of connecting wire 22S93 is connected to the signal branch of connecting wire 18S83, and the other end is connected to the Y terminal input of GLB isolation transformer 604; one end of connecting wire 23S94 is connected to the signal branch of connecting wire 19S84, and the other end is connected to the X terminal input of GLB isolation transformer 604; the X output port of GLB isolation transformer 604 is connected to synchronization changeover switch 4 302d via connecting wire 24S96, and then transferred to terminal A of TBB synchronization signal adapter box 603; the Y output port of GLB isolation transformer 604 is connected to synchronization changeover switch 5 302e via connecting wire 25S95, and then transferred to terminal B of TBB synchronization signal adapter box 603; one end of connecting wire 26S98 is connected to Connecting wire 24 S96, the other end is connected sequentially to the terminals of voltage monitoring relay 1 605a and voltage monitoring relay 2 605b via voltage loop wire 1 304a, and then connected to signal nodes 1L, 45, and 46 of connecting wire 21 S92 via voltage loop wire 2 304b; connecting wire 27 S97 connects one end to signal nodes 1L, 52, and 53 of connecting wire 25 S95, and the other end is connected to the control loop between the terminals of voltage monitoring relay 1 605a and voltage monitoring relay 2 605b; through the coordination of GLB isolation transformer 604, voltage monitoring relay 1 605a and voltage monitoring relay 2 605b and transfer switch, voltage signal monitoring and path control in manual synchronization mode are realized.

[0103] In the synchronization control circuit of this power system, the TBB synchronization signal transfer box 603 serves as the integration hub for voltage signals from the generator 101 side and the system side. It constructs dual independent transfer channels via connecting wires 20S91 and 21S92. This design not only achieves precise signal splitting but also solves the compatibility and reliability challenges of multi-source voltage signals through a collaborative architecture of power extraction point multiplexing, switch scheduling, and terminal mapping.

[0104] Connecting wire 20, channel S91: Powered by connecting wire 16, channel S81, this point serves as the transmission path for the system-side reference voltage signal (e.g., the voltage of 330kV busbar group 103). Connecting wire 20, channel S91, after being switched by synchronizing switch 2, 302b, connects to terminal B0 of the TBB synchronizing signal transfer box 603. This design splits the system-side voltage signal into two paths: the main path, connecting wire 16, continues transmission to the automatic synchronizing device 400; the branch path, connecting wire 20, channel S91, synchronously connects to the TBB synchronizing signal transfer box 603, achieving dual functions of main device control and transfer box backup. Connecting wire 21, channel S92: Powered by connecting wire 17, channel S82, this point carries redundant system-side voltage signals (e.g., interval line voltage). Connecting wire 21, channel S92, after being switched by synchronizing switch 3, 302c, connects to terminal A0 of the TBB synchronizing signal transfer box 603, forming a functional complement to connecting wire 20, channel S91. Connecting wire 20S91 focuses on the voltage of the main body of bus group 103, while connecting wire 21S92 focuses on the voltage associated with the interval line; the two channels achieve signal partitioning management through the A0 and B0 terminals of the TBB synchronous signal adapter box 603 to avoid confusion of different types of voltage signals.

[0105] The configuration of synchronization transfer switches 2 (302b) and 3 (302c) provides the system with flexible signal scheduling capabilities: In maintenance mode, when the TBB synchronization signal transfer box 603 needs maintenance, the corresponding switch (such as synchronization transfer switch 2 (302b)) is disconnected, cutting off the connecting wire 20 (S91) channel without affecting the synchronization control function of the main path (the line from connecting wire 16 (S81) to terminal 2 (606b) of the automatic synchronizing device); in signal optimization, by switching the on / off state of synchronization transfer switches 2 (302b) and 3 (302c), specific signals (such as only the voltage of bus group 103 or only the voltage of the interval line) can be selectively connected to the TBB synchronization signal transfer box 603 to meet the signal processing requirements under different operating conditions; in fault isolation, if a short circuit or other fault occurs inside the TBB synchronization signal transfer box 603, the switch can quickly disconnect the connection to prevent the fault from flowing back into the main signal circuit and protect the safety of the automatic synchronizing device 400.

[0106] The TBB synchronization signal adapter box 603's A0 and B0 terminals serve as access points for dual signals, undertaking different functional divisions: Terminal B0 receives the system-side reference voltage signal transmitted via connecting wire 20S91. This signal is directly related to the voltage of bus group 103 and is used for "synchronization reference comparison" within the TBB synchronization signal adapter box 603, providing a stable reference for subsequent signal processing. Terminal A0 receives the system-side redundant voltage signal transmitted via connecting wire 21S92. This signal reflects the operating status of the bay line and is used for "full-range monitoring" of the system-side voltage by the TBB synchronization signal adapter box 603, assisting in determining the voltage matching degree between bus group 103 and bay line. The coordinated operation of these two terminals enables the TBB synchronization signal adapter box 603 to simultaneously acquire the voltage of bus group 103 and the associated voltage of bay line, constructing a more complete system-side voltage profile and providing multi-dimensional data support for synchronization control.

[0107] The dual-path switching design is characterized by signal compatibility, fault tolerance, and scalability: by drawing power from connecting wires 16S81 and 17S82, the signal originally flowing to the automatic synchronizing device 400 is losslessly multiplexed to the TBB synchronization signal transfer box 603, achieving dual-system compatibility for main control and auxiliary management; the dual-path independent channel design ensures that if one channel fails, the other channel can still maintain basic synchronization function, avoiding system paralysis caused by single-point failure; the A0 and B0 terminals of the TBB synchronization signal transfer box 603 reserve expansion interfaces, allowing for easy access to more types of voltage signals (such as different voltage level bus groups 103) by adding transfer switches and connecting wires in the future, providing a hardware foundation for power system upgrades. This signal multiplexing intelligent scheduling functional partitioning design not only meets the current accuracy requirements of synchronization control but also reserves space for system evolution.

[0108] Specifically, the automatic synchronizing device 400 is equipped with a signal conditioning module connected to the synchronizing signal transfer circuit 300. The signal conditioning module includes a filtering circuit and an amplifying circuit. The filtering circuit is used to filter out harmonic and interference signals of the primary voltage transmitted from the generator boosting main circuit 100 and the voltage acquisition circuit 200 to the synchronizing signal transfer circuit 300. The amplifying circuit is used to amplify the processed voltage signal to a voltage range suitable for the automatic synchronizing device 400 to improve the accuracy of synchronization control.

[0109] In the signal processing link of the automatic synchronizing device 400, the signal conditioning module is connected to the synchronizing signal transfer circuit 300. For the primary voltage signal transmitted by the generator boosting main circuit 100 and the voltage acquisition circuit 200, a collaborative correction mechanism of the filtering circuit and the amplification circuit is constructed: 1. Clutter suppression logic of the filtering circuit: Electromagnetic coupling of the transformer in the generator boosting main circuit 100, the nonlinear response of the current transformer in the voltage acquisition circuit 200, and electromagnetic radiation from long-distance conductors can cause the voltage signal to carry harmonic components and random interference. The filtering circuit suppresses clutter (such as transformer excitation harmonics and conductor radiation noise) that deviates from the power frequency characteristics through frequency selective attenuation, restoring the fundamental waveform of the voltage signal, eliminating the interference of clutter on subsequent frequency and phase determination, and making the signal waveform more closely match the actual variation of the grid voltage.

[0110] II. Amplitude Adaptation Strategy of the Amplifier Circuit: After voltage signals are converted by current transformers and transmitted over long distances, their amplitude may attenuate or fluctuate due to impedance loss and ambient temperature. The amplifier circuit dynamically adjusts the signal gain based on the signal detection threshold of the automatic synchronizing device 400: when the signal amplitude is too low due to transmission loss, the circuit increases the gain to compensate for the attenuation; when the signal amplitude jumps due to fluctuations in operating conditions, the circuit uses gain constraints to prevent signal overflow and distortion. Through amplitude stabilization processing, the signal is always kept within the optimal detection range of the device, eliminating the interference of amplitude fluctuations on voltage difference determination.

[0111] III. The Synergistic Value of Modules and Synchronization Control: The cooperation between filtering and amplification circuits optimizes synchronization determination from the perspectives of signal authenticity and detection adaptability. The filtering circuit removes noise, making the calculation basis for frequency and phase purer; the amplification circuit stabilizes the amplitude, making the voltage difference judgment more accurate. Their synergistic effect reduces the error propagation of front-end circuit signal defects to synchronization determination, providing reliable signal support for judging voltage, frequency, and phase matching during generator 101 grid connection, and ensuring the smoothness of the grid connection process from a signal processing perspective.

[0112] Specifically: All connecting wires in the synchronous signal conversion circuit 300 and the voltage transformers and connecting wires in the voltage acquisition circuit 200 are equipped with electromagnetic compatibility protection structures; the electromagnetic compatibility protection structures include shielded cables wrapped around the outside of the connecting wires and filter elements installed at the connection between the voltage transformers and the connecting wires; the shielded cables are used to shield external electromagnetic interference, and the filter elements are used to suppress electromagnetic noise generated during signal transmission, ensuring the purity of the signal during voltage signal acquisition and conversion, and improving the system's anti-interference capability and operational stability.

[0113] In the synchronization control circuit of this power system, a collaborative protection system of cable shielding and node filtering was constructed to address electromagnetic interference during voltage signal acquisition and switching. This system achieves full-link electromagnetic noise suppression through targeted protection of connecting wires and voltage transformers.

[0114] All connecting wires in the synchronous signal transfer circuit 300 (such as connecting wires 16S81 to 19S84, and connecting wires 20S91 to 21S92) and the connecting wires in the voltage acquisition circuit 200 (such as connecting wires 3S31 to 12S6) adopt a double-layer shielding structure: the outer braided shielding uses a metal mesh to cover the outer layer of the wires, reflecting external electromagnetic fields (such as high-frequency pulses generated by switch operations in substations) through the Faraday cage effect; the inner aluminum foil shielding is tightly attached to the wire insulation layer, absorbing residual electromagnetic energy that penetrates the outer layer, forming a double protective barrier. This structure effectively blocks the coupling of spatial radiation interference to the voltage signal within the wires, ensuring that the signal maintains its original electrical characteristics during transmission.

[0115] At the connection point between the voltage transformer and the connecting wires, an LC filter network and ferrite beads are configured: The LC filter network, through the high inductive reactance of the inductor and the low capacitive reactance of the capacitor, resonates and absorbs common-mode and differential-mode noise at specific frequencies (such as characteristic harmonics generated by the transformer); the ferrite beads, utilizing the hysteresis effect, convert high-frequency noise energy into heat energy for dissipation, and are particularly effective in suppressing MHz-level switching noise. This design forms a noise filtering barrier at the source of signal transmission and at critical transition nodes, preventing electromagnetic noise generated by internal circuit self-excitation from propagating outwards.

[0116] The combined application of shielded cables and filtering components achieves dual protection of spatial isolation and frequency selection: For external interference, shielded cables weaken the intensity of spatial electromagnetic fields, and filtering components further purify residual interference, forming a multi-level protection of first blocking and then purifying; For internal noise, filtering components suppress noise generation at nodes, and shielded cables prevent noise from spreading to adjacent circuits, constructing a closed-loop control of source control and propagation blocking.

[0117] This systematic protection design ensures that the voltage signal maintains waveform integrity and amplitude stability throughout the entire process of acquisition (e.g., from busbar group 103 to voltage transformer), transmission, and transfer, significantly improving the system's operational reliability in strong electromagnetic environments (e.g., substation switchyards).

[0118] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A power system synchronization control circuit, characterized in that: include, The main power generation and voltage boosting circuit (100) includes a generator (101), a main transformer (102) and a busbar group (103) connected in sequence, and is used for power generation, voltage transformation and ultra-high voltage grid transmission. The voltage acquisition circuit (200) includes a first voltage acquisition sub-circuit (201) electrically connected to the bus group (103), and a second voltage acquisition sub-circuit (202) electrically connected to the generator (101). The first voltage acquisition sub-circuit (201) is used to acquire and transmit the voltage signal on the bus system side; the second voltage acquisition sub-circuit (202) is used to acquire and transmit the voltage signal on the generator side; and, The synchronization signal switching circuit (300) includes a synchronization switch electrically connected to the second voltage acquisition sub-circuit (202) and an automatic quasi-synchronization device (400) electrically connected to the synchronization switch; The synchronizing switch is used to collect and transfer the voltage signals from the bus side and the generator side. The automatic synchronizing device (400) receives the voltage signal from the synchronizing signal transfer circuit (300), determines the grid connection conditions, and outputs a closing command.

2. The power system synchronization control circuit according to claim 1, characterized in that: The power generation boost main circuit (100) includes: Generator (101); The main transformer (102) is electrically connected to the generator (101) via a connecting wire (S1); The input terminal of the bus-side switch (104) is electrically connected to the output terminal of the main transformer (102) via connecting wire two (S2); The first branch connecting wire (S21) and the second branch connecting wire (S22) are connected in parallel to the output terminal of the bus-side switch (104); The first branch switch (602a) is connected in series on the first branch connecting wire (S21), and the output terminal of the first branch switch (602a) is used to connect to the first busbar (103a). The second branch switch (602b) is connected in series on the second branch connecting wire (S22), and the output terminal of the second branch switch (602b) is used to connect to the second busbar (103b).

3. The power system synchronization control circuit according to claim 2, characterized in that: The first voltage acquisition sub-circuit (201) includes: Voltage transformer 2 (601b) has its input terminal connected to the second busbar (103b) via connecting wire 3 (S31) and connected to the first spacer line (103c) via connecting wire 4 (S32). Voltage transformer 1 (601a) has its input terminal connected to the first busbar (103a) via connecting wire 5 (S41) and to the second spacer line (103d) via connecting wire 6 (S42); Connecting wire seven (S51) and connecting wire eight (S52) are respectively connected to the output terminals of voltage transformer one (601a) and voltage transformer two (601b); Connecting wire nine (S5) has its input end connected to the output ends of connecting wire seven (S51) and connecting wire eight (S52), and its output end is connected to the synchronous signal conversion circuit (300).

4. The power system synchronization control circuit according to claim 3, characterized in that: The first voltage acquisition sub-circuit (201) also includes: Connecting wire 10 (S61), one end of which is connected to the first spacer wire (103c); Connect wire eleven (S62), one end of which is connected to the second spacer (103d); Connecting wire twelve (S6), the input end of which is connected to the other end of connecting wire ten (S61) and connecting wire eleven (S62); Synchronization switch one (302a), wherein the output terminal of the connecting wire nine (S5) and the output terminal of the connecting wire twelve (S6) are both connected to the input terminal of the synchronization switch one (302a).

5. The power system synchronization control circuit according to claim 1, characterized in that: The second voltage acquisition sub-circuit (202) includes: Connect wire thirteen (S7), one end of which is connected to connecting wire one (S1); Voltage transformer three (601c), the input terminal of which is connected to the other end of the connecting wire thirteen (S7); The first generator side branch connecting wire (S71) and the second generator side branch connecting wire (S72) are connected in parallel to the output terminal of the voltage transformer three (601c); The third branch switch (602c) is connected in series on the first generator side branch connection wire (S71); The fourth branch switch (602d) is connected in series on the branch connection wire (S72) of the second generator side; The output terminals of the first generator-side branch connecting wire (S71) and the second generator-side branch connecting wire (S72) are both connected to the input terminal of the synchronizing switch (302a).

6. The power system synchronization control circuit according to claim 4 or 5, characterized in that: The synchronous signal switching circuit (300) includes: sub-switch one (301d), sub-switch two (301c), sub-switch three (301b), and sub-switch four (301a); Connecting wire sixteen (S81) is connected between the first output terminal of the first synchronous changeover switch one (302a) and the input terminal of the first sub-changeover switch one (301d); Connecting wire seventeen (S82) is connected between the second output terminal of the first synchronous changeover switch (302a) and the input terminal of the second sub-changeover switch (301c); Connecting wire 18 (S83) is connected between the third output terminal of the first synchronous changeover switch (302a) and the input terminal of the fourth sub-changeover switch (301a); Connecting wire nineteen (S84) is connected between the fourth output terminal of the first synchronous changeover switch (302a) and the input terminal of the third sub-changeover switch (301b); The output terminal of sub-switch one (301d) is connected to terminal two (606b) of the automatic synchronizing device (400); the output terminal of sub-switch two (301c) is connected to terminal one (606a) of the automatic synchronizing device (400); the output terminal of sub-switch four (301a) is connected to terminal three (606c) of the automatic synchronizing device (400); and the output terminal of sub-switch three (301b) is connected to terminal four (606d) of the automatic synchronizing device (400).

7. The power system synchronization control circuit according to claim 6, characterized in that: The synchronization signal switching circuit (300) also includes synchronization switch two (302b) and synchronization switch three (302c); Connecting wire twenty (S91), one end of which is connected to the connecting wire sixteen (S81); The other end of the connecting wire 20 (S91) is connected in sequence to the input terminal of the synchronization changeover switch 2 (302b) and the B0 terminal of the TBB synchronization signal adapter box (603); Connecting wire twenty-one (S92), one end of which is connected to the connecting wire seventeen (S82); The other end of the connecting wire 21 (S92) is connected in sequence to the input terminal of the synchronization changeover switch 3 (302c) and the A0 terminal of the TBB synchronization signal adapter box (603).

8. The power system synchronization control circuit according to claim 7, characterized in that: It also includes a manual synchronization control branch (500), which includes: a GLB isolation transformer (604) having an X-end inlet, a Y-end inlet, an X-end outlet and a Y-end outlet; synchronization changeover switch four (302d) and synchronization changeover switch five (302e); voltage monitoring relay one (605a) and voltage monitoring relay two (605b); Connecting wire twenty-two (S93) has one end connected to the connecting wire eighteen (S83) and the other end connected to the Y-terminal inlet of the GLB isolation transformer (604); Connecting wire twenty-three (S94), one end of which is connected to the connecting wire nineteen (S84), and the other end of which is connected to the X-terminal inlet of the GLB isolation transformer (604); Connecting wire 24 (S96) has one end connected to the X output port of the GLB isolation transformer (604) and the other end connected to the input terminal of the synchronizing changeover switch 4 (302d); The output terminal of the synchronization changeover switch four (302d) is connected to terminal A of the TBB synchronization signal adapter box (603); Connecting wire 25 (S95) has one end connected to the Y output port of the GLB isolation transformer (604) and the other end connected to the input terminal of the synchronization changeover switch 5 (302e); The output terminal of the synchronization changeover switch five (302e) is connected to the B terminal of the TBB synchronization signal adapter box (603); Connecting wire 26 (S98), one end of which is connected to the connecting wire 24 (S96); Voltage loop wire 1 (304a) has one end connected to the other end of the connecting wire 26 (S98), and the other end connected to the terminal of voltage monitoring relay 1 (605a) and the terminal of voltage monitoring relay 2 (605b). Voltage loop wire 2 (304b) has one end connected to the connecting wire 21 (S92) and the other end connected to the terminal of the voltage monitoring relay 1 (605a) and the terminal of the voltage monitoring relay 2 (605b). Connecting wire 27 (S97) has one end connected to connecting wire 25 (S95) and the other end connected to the node between the terminal of voltage monitoring relay 1 (605a) and the terminal of voltage monitoring relay 2 (605b).

9. The power system synchronization control circuit according to claim 1, characterized in that: The automatic synchronizing device (400) includes a signal conditioning module; the signal conditioning module includes a filtering circuit and an amplification circuit; the input terminal of the filtering circuit is connected to the output terminal of the synchronizing signal conversion circuit (300); the output terminal of the filtering circuit is connected to the input terminal of the amplification circuit; the output terminal of the amplification circuit is connected to the determination unit of the automatic synchronizing device (400).

10. The power system synchronization control circuit according to claim 9, characterized in that: Electromagnetic compatibility protection structures are provided at the connection points of the connecting wires of the synchronous signal transfer circuit (300) and the connection points of the voltage transformer and the connecting wires in the voltage acquisition circuit (200). The electromagnetic compatibility protection structure includes: Shielded cable, wrapped around the outside of the connecting wire; A filter element is installed at the connection point between the voltage transformer and the connecting wire.

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