Long-distance power transmission stability protection system
By introducing compensation modules and reactor modules into long-distance power transmission systems, reactive power is monitored and compensated, solving the voltage rise problem caused by submarine cable-to-ground capacitance and ensuring the stability and safety of the power system.
Patent Information
- Application Number
- CN202423322224.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-03-06
- Estimated Expiration
- 2034-12-31
AI Technical Summary
During long-distance power transmission, especially with submarine cables, the capacitance to ground of the submarine cable generates reactive power, which leads to an increase in voltage at the end of the line, affecting the stability of the power supply system and damaging the insulation of the submarine cable and the load at the end.
The system employs compensation modules and reactor modules, including incoming line circuit breaker cabinets, feeder circuit breaker cabinets, and reactor cabinets, to monitor and compensate for the reactive power of the power system, thereby reducing the line operating voltage and preventing voltage rise at the end of the line.
It effectively maintains the stability of the power system during long-distance power transmission, protects the main lines and submarine data center lines from damage, and ensures the stable operation of the power system.
Smart Images
Figure CN223978428U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power equipment technology, specifically to a long-distance power transmission stability protection system. Background Technology
[0002] Currently, submarine data centers utilize offshore wind power to provide computing power. Some offshore wind farms are tens of kilometers away from shore stations, and submarine data center construction sites are typically located near these wind farms. To save on structural costs, diesel generators are placed on shore. When both wind and mains power are interrupted, the diesel generators are activated to feed power back to the submarine data center. During long-distance power transmission, especially when submarine cables are involved, the capacitance to ground of the submarine cable is a significant factor. This capacitance generates reactive power, leading to voltage increases at the line's end. During the diesel generator power transmission back to the submarine data center, the capacitive capacitance of the long-distance submarine cable transmission to ground causes voltage increases at the end of the cable when lightly loaded, affecting the stability of the power supply system and potentially damaging the cable insulation and the end load. Utility Model Content
[0003] In view of this, the present invention provides a long-distance power transmission stability protection system to improve the stability of the power system during long-distance power transmission.
[0004] In a first aspect, a long-distance power transmission stability protection system is provided, comprising a compensation module and a reactor module; the compensation module includes an incoming line circuit breaker cabinet, a feeder circuit breaker cabinet, and a reactor cabinet; a first port of the incoming line circuit breaker cabinet is connected to the incoming cable; a second port of the incoming line circuit breaker cabinet is connected to the first port of the feeder circuit breaker cabinet and the first port of the reactor cabinet; a second port of the feeder circuit breaker cabinet is connected to the port of the data cabin transformer; and a second port of the reactor cabinet is connected to the reactor module.
[0005] This utility model discloses a long-distance power transmission stability protection system, comprising a compensation module and a reactor module. The compensation module includes an incoming line circuit breaker cabinet, a feeder circuit breaker cabinet, and a reactor cabinet, effectively maintaining the stability of the power system during long-distance power transmission. The first port of the incoming line circuit breaker cabinet connects to the incoming cable, and the second port connects to the first ports of the feeder circuit breaker cabinet and the reactor cabinet, protecting the main line. The second port of the feeder circuit breaker cabinet connects to the port of the data cabin transformer, protecting the submarine data center lines. The second port of the reactor cabinet connects to the reactor module, compensating for the submarine cable's capacitance to ground, thereby reducing the line's operating voltage and preventing voltage spikes at the end of the line.
[0006] In one alternative implementation, the incoming circuit breaker cabinet includes a first circuit breaker, a first current transformer, a first voltage transformer, and a first meter.
[0007] In one alternative implementation, the feeder circuit breaker cabinet includes a second circuit breaker, a second current transformer, a second voltage transformer, and a second meter.
[0008] In one optional implementation, the reactor cabinet includes a third circuit breaker, a third current transformer, a third voltage transformer, a disconnecting switch, a reactor, and a power cabinet.
[0009] The optional components of the incoming line circuit breaker cabinet, feeder circuit breaker cabinet, and reactor cabinet in the above embodiments together constitute the core of the long-distance power transmission stability protection system. They ensure the stable operation of the power system by monitoring, protecting, and compensating for the reactive power of the power system.
[0010] In one alternative implementation, the reactor capacity Q in the reactor cabinet is... L The value of Qc is set to 0.9 times, where Qc is the capacitance of the incoming cable to ground.
[0011] This embodiment specifies the reactor capacity Q in the reactor cabinet. L Setting Qc to 0.9 times is an effective reactive power compensation strategy that can significantly improve the stability and efficiency of the power system during long-distance power transmission.
[0012] In one alternative implementation, the Qc formula is as follows:
[0013] Qc=ωC0LU 2
[0014] Where ω is the rate of change of the alternating current, C0 is the capacitance to ground per unit length of the incoming cable, L is the length of the incoming cable, and U is the effective value of the voltage of the incoming cable.
[0015] This implementation method comprehensively considers the rate of change of AC power, the capacitance to ground per unit length of the incoming cable, the length of the incoming cable, and the effective voltage value of the incoming cable to ensure accurate compensation of reactive power, thereby improving the stability and efficiency of the power system.
[0016] The above solution, through the coordinated operation of the compensation module and the reactor module, solves the problem of voltage rise at the end of long-distance power transmission in underwater data centers, and improves the stability of the power system during long-distance power transmission. Attached Figure Description
[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 This is a structural block diagram of a long-distance power transmission stability protection system according to an embodiment of the present utility model. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0020] This embodiment provides a long-distance power transmission stability protection system. Figure 1 This is a structural block diagram of a long-distance power transmission stability protection system according to an embodiment of the present utility model, as shown below. Figure 1 As shown, the system includes a compensation module 10 and a reactor module 20; the compensation module 10 includes an incoming line circuit breaker cabinet 101, a feeder circuit breaker cabinet 102, and a reactor cabinet 103; the first port of the incoming line circuit breaker cabinet 101 is connected to the incoming cable; the second port of the incoming line circuit breaker cabinet 101 is connected to the first port of the feeder circuit breaker cabinet 102 and the first port of the reactor cabinet 103; the second port of the feeder circuit breaker cabinet 102 is connected to the port of the data cabin transformer; the second port of the reactor cabinet 103 is connected to the reactor module 20.
[0021] This utility model's long-distance power transmission stability protection system mainly comprises two core modules: a compensation module and a reactor module. These two modules work together to ensure the stability of the power system during long-distance power transmission.
[0022] The compensation module is responsible for monitoring and adjusting the reactive power of the power system to maintain stable system operation. The compensation module consists of three sub-modules: incoming circuit breaker cabinet, feeder circuit breaker cabinet, and reactor cabinet.
[0023] The incoming circuit breaker cabinet is the entry point of the power system, responsible for receiving power input from the external incoming cable. The first port of the incoming circuit breaker cabinet connects to the incoming cable, receiving external power. The second port of the incoming circuit breaker cabinet connects to both the first port of the feeder circuit breaker cabinet and the first port of the reactor cabinet, distributing power to both. The incoming circuit breaker cabinet has a built-in circuit breaker that can quickly disconnect the power supply in the event of overload, short circuit, or other faults, protecting the main line from damage.
[0024] The feeder circuit breaker cabinet is responsible for transmitting power from the incoming circuit breaker cabinet to the data cabin transformer in the subsea data center. The first port of the feeder circuit breaker cabinet connects to the second port of the incoming circuit breaker cabinet, receiving power from it. The second port of the feeder circuit breaker cabinet connects to the port of the data cabin transformer, transmitting power to the data cabin transformer in the subsea data center. The feeder circuit breaker cabinet also has a built-in circuit breaker, which can quickly cut off power in the event of overload, short circuit, or other faults in the subsea data center's lines, protecting the lines from damage.
[0025] The reactor cabinet connects to the reactor modules, providing reactive power compensation to the power system. The first port of the reactor cabinet connects to the second port of the incoming circuit breaker cabinet, receiving power from it. The second port of the reactor cabinet connects to the reactor modules, transmitting power to them for reactive power compensation.
[0026] The reactor module connects to the reactor cabinet via its second port, receives power from the cabinet, and performs reactive power compensation. By compensating for the reactive power generated by the submarine cable's capacitance to ground, the reactor module can reduce the line operating voltage, especially when the system is under light load or no load, effectively preventing voltage rise at the end and thus protecting the stable operation of the entire power system.
[0027] In summary, during long-distance power transmission, the incoming circuit breaker cabinet receives power input from the outside and distributes it to the feeder circuit breaker cabinet and reactor cabinet through its second port. The feeder circuit breaker cabinet transmits power to the data cabin transformer of the submarine data center, while the reactor cabinet compensates for reactive power in the power system through reactor modules. When the power system experiences faults such as current overload or short circuit, the circuit breakers in the incoming and feeder circuit breaker cabinets can quickly disconnect the power supply, protecting the main line and the submarine data center lines from damage. Simultaneously, the reactor modules compensate for the reactive power generated by the capacitance between the submarine cable and the ground, reducing the line operating voltage and preventing voltage rise at the end, thereby ensuring the stable operation of the power system.
[0028] Optionally, the incoming circuit breaker cabinet includes a first circuit breaker, a first current transformer, a first voltage transformer, and a first meter.
[0029] The optional components of the incoming line circuit breaker cabinet may include:
[0030] As the main protective component of the incoming line circuit breaker cabinet, the first circuit breaker can quickly cut off the power supply when faults such as current overload and short circuit are detected, protecting the main line from damage. When the current exceeds the set rated value, the thermal or magnetic elements inside the circuit breaker will trigger the mechanism to operate, causing the circuit breaker to trip and disconnect the circuit.
[0031] The first current transformer is used to measure the current in the incoming cable and convert the high current into a low current signal for use by the protection system.
[0032] The first voltage transformer is used to measure the voltage in the incoming cable, converting the high voltage into a low voltage signal for use by the protection system. Based on the principle of electromagnetic induction, it converts the high voltage on the primary side into the low voltage on the secondary side for easy measurement and protection.
[0033] The first meter displays electrical parameters such as current and voltage in the incoming cable, allowing maintenance personnel to monitor the power system status. It receives output signals from current transformers and voltage transformers, converting the electrical parameters into visual digital or pointer displays.
[0034] Optionally, the feeder circuit breaker cabinet includes a second circuit breaker, a second current transformer, a second voltage transformer, and a second meter.
[0035] The optional components of the feeder circuit breaker cabinet may include:
[0036] The second circuit breaker, as the main protective component of the feeder circuit breaker cabinet, can quickly cut off the power supply when it detects faults such as current overload or short circuit on the submarine data center lines, protecting the submarine data center lines from damage. Similar to the first circuit breaker, when the current exceeds the set rated value, the circuit breaker will trigger a mechanism to operate, causing the circuit breaker to trip.
[0037] The second current transformer is used to measure the current in the feeder cable for use by the protection system. Similar to the first current transformer, it converts high current into a low current signal based on the principle of electromagnetic induction.
[0038] The second voltage transformer is used to measure the voltage in the feeder cable for use by the protection system. Similar to the first voltage transformer, it converts high voltage into a low voltage signal based on the principle of electromagnetic induction.
[0039] The second meter displays electrical parameters such as current and voltage in the feeder cable, allowing maintenance personnel to monitor the status of the submarine data center's lines. Similar to the first meter, it displays the data by receiving output signals from current transformers and voltage transformers.
[0040] Optionally, the reactor cabinet includes a third circuit breaker, a third current transformer, a third voltage transformer, a disconnecting switch, a reactor, and a power cabinet.
[0041] The optional components of the reactor cabinet may include:
[0042] The third circuit breaker, as a protective element of the reactor cabinet, can quickly cut off the power supply when it detects faults such as current overload or short circuit on the reactor module or connecting lines, protecting the reactor module and connecting lines from damage. Similar to the first and second circuit breakers, the circuit breaker will trigger its mechanism to operate when the current exceeds the set rated value.
[0043] The third current transformer is used to measure the current in reactor modules or connecting lines for use by protection systems. Similar to the first and second current transformers, it converts high current into a low current signal based on the principle of electromagnetic induction.
[0044] The third voltage transformer is used to measure the voltage in reactor modules or connecting lines for use by the protection system. Similar to the first and second voltage transformers, it converts high voltage into a low voltage signal based on the principle of electromagnetic induction.
[0045] Disconnecting switches are used to disconnect reactors from the power system when necessary for maintenance or replacement of reactor modules. The disconnecting switch is operated manually or electrically to open or close, thereby cutting off or connecting the reactor to the power system.
[0046] As a reactive power compensation element, the reactor can compensate for the reactive power generated by the capacitance between the submarine cable and the ground, reduce the operating voltage of the line, and avoid the problem of voltage rise at the end. Through its inductive characteristics, the reactor can absorb or release reactive power to balance the reactive power of the power system.
[0047] Power cabinets are used to house and protect reactors and their related control components, such as contactors and relays. Power cabinets typically have sealing, dustproof, and moisture-proof functions to ensure the normal operation of reactors and their related control components.
[0048] In summary, the optional components of the incoming line circuit breaker cabinet, feeder circuit breaker cabinet, and reactor cabinet together constitute the core of the long-distance power transmission stability protection system. They ensure the stable operation of the power system by monitoring, protecting, and compensating for the reactive power of the power system.
[0049] In one alternative implementation, the reactor capacity Q in the reactor cabinet is... L The value of Qc is set to 0.9 times, where Qc is the capacitance of the incoming cable to ground.
[0050] Qc represents the reactive power generated by the capacitance between the submarine cable and the ground.
[0051] A reactor is a component capable of generating inductive reactive power. Through its inductive characteristics, it can absorb or release reactive power to balance the reactive power of the power system. In this embodiment, the reactor's capacity Q... L It is 0.9 times Qc.
[0052] The reactor capacity Q L Setting Qc to 0.9 times allows for precise compensation of reactive power generated by the submarine cable's capacitance to ground. This compensation strategy minimizes line operating voltage and avoids voltage spikes at the ends. Simultaneously, it ensures effective compensation while preventing overcompensation.
[0053] In one alternative implementation, the Qc formula is as follows:
[0054] Qc=ωC0LU 2
[0055] Where ω is the rate of change of the alternating current, C0 is the capacitance to ground per unit length of the incoming cable, L is the length of the incoming cable, and U is the effective value of the voltage of the incoming cable.
[0056] Specifically:
[0057] The rate of change of alternating current (AC) is represented by its angular frequency ω. The angular frequency ω is related to the power supply frequency f, specifically ω = 2πf. In a power system, the rate of change of AC affects the reactive power compensation effect of a reactor. The impedance of a reactor is proportional to the angular frequency ω; therefore, as the rate of change of AC increases, the impedance of the reactor also increases, thus affecting its reactive power compensation capability.
[0058] The capacitance to ground per unit length of the incoming cable refers to the capacitive effect generated by the cable to ground per unit length. This value is a physical characteristic parameter related to factors such as the cable's material, structure, and surrounding environment. The capacitance to ground per unit length of the incoming cable determines the amount of reactive power generated by the cable to ground. Reactive power is directly proportional to the capacitance value; therefore, as the capacitance to ground per unit length increases, the reactive power generated by the cable to ground also increases. To maintain the reactive power balance of the power system, the capacity of the reactor can be increased accordingly to compensate for this reactive power.
[0059] The length of the incoming cable refers to the cable length from the power source to the submarine data center. The longer the cable, the greater the reactive power generated by the ground capacitance. Because reactive power is directly proportional to cable length, the capacity of the reactor can be increased to compensate for more reactive power as the cable length increases.
[0060] The effective voltage (RMS) of an incoming cable refers to the average voltage of the alternating current flowing through the cable, reflecting the magnitude of the voltage. The RMS voltage affects the reactive power generated by the cable's capacitance to ground. Reactive power is proportional to the square of the voltage; therefore, as the RMS voltage increases, the reactive power generated by the cable to ground also increases significantly. To maintain the reactive power balance of the power system, the capacity of the reactor can be increased accordingly to compensate for this increased reactive power.
[0061] In summary, the rate of change of alternating current, the capacitance to ground per unit length of the incoming cable, the length of the incoming cable, and the effective voltage of the incoming cable all affect the reactor capacity Q. L The settings, as well as the balance of reactive power and voltage stability in the power system.
[0062] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.
Claims
1. A long distance power transmission stability protection system, characterized by, The system comprises a compensation module and a reactor module; The compensation module comprises an incoming line circuit breaker cabinet, a feeder circuit breaker cabinet and a reactor cabinet; The first port of the incoming line circuit breaker cabinet is connected with an incoming line cable; the second port of the incoming line circuit breaker cabinet is connected with the first port of the feeder circuit breaker cabinet and the first port of the reactor cabinet; The second port of the feeder circuit breaker cabinet is connected with a port of a data pod transformer; The second port of the reactor cabinet is connected with the reactor module.
2. The system of claim 1, wherein, The incoming line circuit breaker cabinet comprises a first circuit breaker, a first current transformer, a first voltage transformer and a first electric meter.
3. The system of claim 1, wherein, The feeder circuit breaker cabinet comprises a second circuit breaker, a second current transformer, a second voltage transformer and a second electric meter.
4. The system of claim 1, wherein, The reactor cabinet comprises a third circuit breaker, a third current transformer, a third voltage transformer, a disconnector, a reactor and a power cabinet.
5. The system of claim 4, wherein, The reactor capacity Q in the reactor cabinet L Qc is the line cable-to-ground capacitance value 6. The system of claim 5, wherein, The Qc formula is as follows: Qc = ωC0LU 2 wherein ω is the rate of alternating current change, C0 is the ground capacitance per unit length of the incoming line cable, L is the length of the incoming line cable, and U is the voltage effective value of the incoming line cable.