Electric control assembly of generator and gas turbine generator set

Abstract

The utility model discloses a generator electric control assembly and a gas turbine generator set, comprising a generator body used for being connected with a gas turbine, a main wire outlet box arranged at the side edge of the generator body, and an auxiliary junction box connected with the generator body and arranged adjacent to the main wire outlet box, an outgoing line copper bar connected with the generator body, a voltage mutual inductance piece connected with the outgoing line copper bar and used for converting high voltage into low voltage, a current mutual inductance piece connected with the outgoing line copper bar and an excitation current transformer used for measuring excitation current and providing feedback signals are arranged in the main outgoing line box; a wiring assembly and an excitation control loop used for excitation control are arranged in the auxiliary junction box. Compared with the prior art, labor cost, material cost and test cost are greatly saved, wiring workload is reduced, construction efficiency is improved, the generator body and the electric control components are integrally arranged, the occupied space is small, and the device is suitable for projects with high space occupation requirements, high in practicability and suitable for wide popularization and application.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas power generation technical field, especially, relate to a kind of generator electric control assembly. In addition, the utility model further relates to a kind of gas turbine generator set comprising above-mentioned generator electric control assembly. BACKGROUND

[0002] Gas turbine generator set is a kind of thermal power plant combining gas turbine and generator, driven by fuel combustion to drive gas turbine to work, to convert the heat energy in fuel into mechanical energy, and then through the synchronous generator dragged by it to convert mechanical energy into electrical energy.

[0003] As Figure 1 As shown in the figure, gas turbine generator set is mainly composed of gas turbine 1, speed reducer 2, generator 3, base 4, box 5, box air intake system 6, box exhaust system 7, gas turbine control room 8, generator control cabinet 9, generator protection cabinet 10, unit MCC cabinet 11 and generator cabinet 12, wherein, gas turbine 1, speed reducer 2, generator 3 and base 4, box 5, box air intake system 6 and box exhaust system 7 are integrated into gas turbine unit, gas turbine control room 8, generator control cabinet 9, generator protection cabinet 10, unit MCC cabinet 11 and generator cabinet 12 are installed in the control room of power station, unit MCC cabinet 11 is installed in the low pressure room of power station, generator cabinet 12 is installed in high pressure room, control room, low pressure room and high pressure room are all spaced about 100 meters from gas turbine unit.

[0004] However, due to a large number of connecting cables between the gas engine control cabinet 8, the generator control cabinet 9, the generator protection cabinet 10, the unit MCC cabinet 11, the generator cabinet 12 and the gas engine unit, for example, the excitation loop in the generator control cabinet 9 needs to be connected with the generator 3 through a low-voltage cable, and the voltage transformer and the current transformer in the generator cabinet 12 need to be connected with the outgoing copper bar of the generator 3 through a high-voltage cable, which results in a large amount of wiring work in the field construction of the existing scheme, a long construction period and a high overall cost, among which the highest cost is the wiring of the high-voltage cable. Since the generator cabinet 12 is installed in the high-voltage room, the distance from the high-voltage room to the gas engine unit is as long as 100 meters, the total length of the two high-voltage cables connected with the outgoing copper bar of the generator is 200 meters, the high-voltage cable heads need to be made at both ends of the high-voltage cable, and the high-voltage test needs to be carried out before the high-voltage cable and the cable head are formally powered on. The process is complex, the test period is relatively long, and the cost is very high. The cost of the high-voltage cable is 800 yuan per meter, the total cost of the 200-meter high-voltage cable is 160,000 yuan, the total cost of the four high-voltage cable heads is 5,000 yuan, the cost of the high-voltage test is 5,000 yuan, and the labor cost of the high-voltage cable laying is 5,000 yuan. A total of 175,000 yuan is needed for each unit, and it takes about one week to lay the cable, make the cable head and carry out the high-voltage test. The wiring work is heavy, the cost is high, the efficiency is low, and it cannot be used in projects with high space occupation requirements such as vehicle-mounted mobile power supply and offshore platform power generation. Practical new type content

[0005] The utility model provides a kind of generator electric control assembly and gas turbine generator unit, to solve the technical problems of the wiring work of existing gas turbine generator unit, high cost, low efficiency, and limited applicable projects.

[0006] According to one aspect of the utility model, a kind of generator electric control assembly is provided, including generator body for being connected with gas turbine, main outgoing line box being laid in the side of generator body and auxiliary wiring box being connected with generator body and being laid in the vicinity of main outgoing line box, outgoing copper bar being connected with generator body is laid in main outgoing line box, voltage mutual inductance piece for converting high voltage into low voltage being connected with outgoing copper bar, current mutual inductor being connected with outgoing copper bar and excitation current transformer for measuring excitation current and providing feedback signal, wiring assembly and excitation control loop for excitation control are laid in auxiliary wiring box.

[0007] As a further improvement of the above technical solution:

[0008] Further, the voltage mutual inductor comprises a first voltage mutual inductor and a second voltage mutual inductor arranged in the main outgoing line box, the A end of the primary winding of the first voltage mutual inductor is used for connecting the A phase of the high-voltage line, the X end of the primary winding of the first voltage mutual inductor is used for connecting the B phase of the high-voltage line, the A end of the primary winding of the second voltage mutual inductor is used for connecting the B phase of the high-voltage line, the X end of the primary winding of the second voltage mutual inductor is used for connecting the C phase of the high-voltage line, the a end of the secondary winding of the first voltage mutual inductor is used for leading out the A phase voltage signal, the a end of the secondary winding of the second voltage mutual inductor is used for leading out the C phase voltage signal, and the b end of the secondary winding of the first voltage mutual inductor and the b end of the secondary winding of the second voltage mutual inductor are used for jointly leading out the B phase voltage signal.

[0009] Further, the excitation current mutual inductor comprises a shell, a core arranged in the shell, a secondary winding arranged on the core, a through hole for the high-voltage cable to pass through arranged on the core, a first insulation layer arranged on the inner wall of the through hole, a second insulation layer arranged on the outer wall of the core, and a wiring terminal arranged on the shell.

[0010] Further, the current mutual inductor is a three-phase current mutual inductor.

[0011] Further, the main outgoing line box is arranged with a lightning arrester connected with the outgoing copper bar for grounding.

[0012] Further, the main outgoing line box is arranged with a lightning arrester connected with the outgoing copper bar for grounding.

[0013] Further, the wiring assembly comprises a voltage mutual inductor secondary wiring, a current mutual inductor secondary wiring, an excitation machine wiring, a permanent magnet machine wiring and a temperature measuring resistor wiring.

[0014] Further, the excitation control loop comprises an excitation regulator for excitation adjustment, which is respectively connected with the voltage mutual inductor, the current mutual inductor, the excitation current mutual inductor, the voltage mutual inductor secondary wiring, the excitation machine wiring and the permanent magnet machine wiring.

[0015] Further, the auxiliary wiring box is further arranged with a radiator.

[0016] According to another aspect of the utility model, a gas turbine generator set is also provided, which comprises the above-mentioned generator electric control assembly.

[0017] The utility model has the advantages of the following beneficial effects:

[0018] This utility model discloses a generator control assembly with a main output box and an auxiliary terminal box arranged on the side of the generator body. The main output box houses the output copper busbars, voltage transformers, current transformers, and an excitation current transformer. The voltage and current transformers work together for power generation control and protection. The generator body is connected to the voltage and current transformers via the output copper busbars, significantly reducing the need for high-voltage cables for power generation control and protection. The auxiliary terminal box houses the excitation control circuit and wiring components. The voltage transformers, excitation current sensor, and excitation control circuit work together for excitation control. The generator body is connected to the excitation current sensor, significantly reducing the need for low-voltage cables for excitation control. Primary components are installed in the main output box, while low-voltage and secondary components are installed in the auxiliary terminal box to prevent electromagnetic interference. Compared to existing technologies, this solution significantly saves labor, material, and testing costs, reduces wiring workload, and improves construction efficiency. Furthermore, the integrated arrangement of the generator body and control components occupies little space, making it suitable for projects with high space requirements. It is highly practical and suitable for widespread promotion and application.

[0019] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structural layout of an existing gas turbine generator set;

[0022] Figure 2 This is a first-view structural schematic diagram of the generator electronic control assembly according to a preferred embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the generator electronic control assembly from a second perspective, representing a preferred embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the internal structure of the main output box in the generator control assembly of a preferred embodiment of the present invention.

[0025] Legend:

[0026] 1. Gas turbine; 2. Gearbox; 3. Generator; 4. Base; 5. Housing; 6. Housing air intake system; 7. Housing exhaust system; 8. Gas turbine control room; 9. Generator control cabinet; 10. Generator protection cabinet; 11. Unit MCC cabinet; 12. Generator cabinet;

[0027] 100, generator body; 200, main outlet box; 210, outlet copper bar; 220, voltage mutual inductance; 230, current mutual inductance; 240, excitation current mutual inductor; 300, auxiliary junction box. DETAILED DESCRIPTION

[0028] The embodiments of the utility model are described in detail below in combination with the drawings, but the utility model can be implemented in multiple different ways limited and covered by the following.

[0029] As Figures 2-4 shown, the generator electric control assembly of the embodiment, including for with gas turbine connection's generator body 100, the main outlet box 200 that is arranged in the side of generator body 100 and with generator body 100 is connected and is arranged in the immediate vicinity with main outlet box 200 of auxiliary junction box 300, main outlet box 200 is arranged with the outlet copper bar 210 that is connected with generator body 100, the voltage mutual inductance 220 for with outlet copper bar 210 connection is used to convert high voltage into low voltage, the current mutual inductance 230 that is connected with outlet copper bar 210 and the excitation current mutual inductor 240 for measuring excitation current and providing feedback signal are connected, auxiliary junction box 300 is arranged with wiring assembly (not shown in drawing) and the excitation control loop (not shown in drawing) for excitation control.

[0030] As Figures 2-4 shown, specifically, the generator electric control assembly of the utility model, the main outlet box 200 and auxiliary junction box 300 are arranged in the side of generator body 100, the outlet copper bar 210, voltage mutual inductance 220, current mutual inductance 230 and excitation current mutual inductor 240 are arranged in main outlet box 200, and the voltage mutual inductance 220 and current mutual inductance 230 cooperate to carry out power generation control and protection, and the generator body 100 is connected with voltage mutual inductor and current mutual inductor through outlet copper bar 210, so that the high-voltage cable required for power generation control and protection is greatly reduced, the excitation control loop and wiring assembly are arranged in auxiliary junction box 300, excitation control is carried out through the cooperation of voltage mutual inductance 220, excitation current sensor and excitation control loop, and the generator body 100 is connected with excitation current sensor, so that the low-voltage cable required for excitation control is greatly reduced, high-voltage primary components are installed in main outlet box 200, and low-voltage and secondary components are installed in auxiliary junction box 300, so as to prevent electromagnetic interference, and the scheme greatly saves labor cost, material cost and test cost, reduces wiring workload, improves construction efficiency, and the generator body and electric control components are integrated and arranged, occupy small space, suitable for projects with high space occupation requirements, strong practicability, and suitable for wide promotion and application.

[0031] As Figure 4As shown, in this embodiment, the voltage transformer 220 includes a first voltage transformer and a second voltage transformer arranged at intervals within the main outgoing box 200. The A end of the primary winding of the first voltage transformer is used to connect to phase A of the high-voltage line, the X end of the primary winding of the first voltage transformer 220 is used to connect to phase B of the high-voltage line, the A end of the primary winding of the second voltage transformer is used to connect to phase B of the high-voltage line, the X end of the primary winding of the second voltage transformer is used to connect to phase C of the high-voltage line, the a end of the secondary winding of the first voltage transformer is used to extract the phase A voltage signal, the a end of the secondary winding of the second voltage transformer is used to extract the phase C voltage signal, and the b ends of the secondary windings of the first and second voltage transformers are used to jointly extract the phase B voltage signal.

[0032] Specifically, excitation and power generation control are achieved by using a VV connection between the first and second voltage transformers. Compared to the existing three-phase voltage transformers, this reduces one voltage transformer, lowers the weight, and saves 3,000 yuan in costs.

[0033] like Figure 4 As shown, in this embodiment, the excitation current transformer 240 includes a housing, an iron core disposed inside the housing, a secondary winding wound on the iron core, a through hole opened on the iron core for a high-voltage cable to pass through, a first insulating layer disposed on the inner wall of the through hole, a second insulating layer disposed on the outer wall of the iron core, and terminals disposed on the housing.

[0034] Specifically, the high-voltage cable connecting the generator body 100 and the outgoing copper busbar 210 passes through the iron core via a through hole to generate a magnetic field as the primary winding, thereby inducing a corresponding electromotive force and current in the secondary winding. By measuring the current in the secondary winding, the current on the primary side can be calculated.

[0035] like Figure 4 As shown, in this embodiment, the current transformer 230 is a three-phase current transformer. Specifically, the three-phase current transformer can simultaneously measure and detect the three-phase current, acquire the magnitude and phase signals of the three-phase current in real time, and promptly detect problems such as three-phase current imbalance, phase loss, and overload. This helps to accurately determine the operating status of the generator and ensure its safe and stable operation. In addition, since the operating conditions of gas turbine generator sets are complex and variable, the three-phase current transformer can adapt to different load changes and fault conditions, quickly and accurately respond to current changes, and provide timely and effective signals for the excitation control circuit, ensuring that the generator body 100 can be reliably protected and stably controlled under various operating conditions.

[0036] In this embodiment, the main outgoing line box 200 is provided with a lightning arrester connected with the outgoing copper bar 210 for grounding. Specifically, the lightning arrester can introduce lightning current into the ground when lightning occurs, or limit the voltage within the range that the generator body 100 can withstand when operating overvoltage, so as to protect the generator body 100 from lightning overvoltage and operating overvoltage.

[0037] In this embodiment, the main outgoing line box 200 is provided with a grounding bolt connected with the lightning arrester. Specifically, the grounding bolt can introduce current on the main outgoing line box 200 into the ground to avoid electric shock injury to the operator and protect personal safety; the grounding bolt cooperates with the lightning arrester to keep the potential of the generator body 100 within a safe range when ground fault occurs or is struck by lightning; it can also provide a low-impedance path for electromagnetic interference in the generator body 100, limit electromagnetic interference within a certain range, provide anti-interference capability of the generator body 100, and ensure its stable operation.

[0038] In this embodiment, the wiring assembly includes voltage transformer secondary wiring, current transformer secondary wiring, exciter wiring, permanent magnet machine wiring, and temperature measurement resistance wiring.

[0039] Specifically, by accommodating the voltage transformer secondary wiring, the current transformer secondary wiring, the exciter wiring, the permanent magnet machine wiring, and the temperature measurement resistance wiring in the auxiliary wiring box 300, the use of low-voltage cables is maximized, thereby reducing wiring workload and saving material costs.

[0040] It should be understood that the voltage transformer secondary wiring refers to the wiring that connects the winding on the secondary side of the voltage transformer with measuring instruments, protection devices, metering devices, and other equipment.

[0041] Optionally, the voltage transformer secondary wiring is led from the voltage transformer 220 to the wiring terminal in the auxiliary wiring box 300.

[0042] It should be understood that the current transformer secondary wiring refers to the wiring that connects the winding on the secondary side of the current transformer with measuring instruments, protection devices, metering devices, and other equipment.

[0043] Optionally, the current transformer secondary wiring is led from the current transformer 230 to the wiring terminal in the auxiliary wiring box 300.

[0044] It should be understood that the permanent magnet machine wiring refers to the wiring that electrically connects the permanent magnet machine with related equipment of the gas turbine generator set.

[0045] It should be understood that the temperature measurement resistance wiring refers to the wiring that electrically connects the temperature measurement resistance with related equipment of the gas turbine generator set.

[0046] In the embodiment, the excitation control circuit comprises an excitation regulator for excitation regulation connected with the voltage transformer 220, the current transformer 230, the excitation current transformer 240, the voltage transformer secondary wiring, the excitation machine wiring and the permanent magnet machine wiring respectively.

[0047] Specifically, the voltage transformer 220, the current transformer 230, the excitation current transformer 240, the voltage transformer secondary wiring, the excitation machine wiring and the permanent magnet machine wiring are connected with the excitation regulator respectively, so that the size of the excitation current is automatically adjusted according to the operating parameters such as the voltage and the current of the generator body 100, so as to maintain the voltage stability of the generator body 100 and meet the requirements of the power system operation.

[0048] It should be understood that the excitation machine wiring refers to the line for electrically connecting the excitation machine with the generator, the excitation regulator and other related devices.

[0049] In the embodiment, the auxiliary wiring box 300 is also provided with a radiator. Specifically, the excitation regulator is cooled by the radiator, so as to ensure the stable operation of the excitation regulator.

[0050] It should be understood that the generator electric control assembly of the embodiment has been applied to two types of gas turbine generator sets, and each set saves 175000 yuan and shortens the construction period by 6 days.

[0051] The gas turbine generator set of the embodiment comprises the above-mentioned generator electric control assembly. Specifically, the technical effects of the gas turbine generator set provided by the embodiment are the same as those of the generator electric control assembly provided by the above-mentioned embodiment, and thus will not be described herein.

[0052] The above only describes the preferred embodiments of the utility model and is not used to limit the utility model. For those skilled in the art, the utility model can be changed and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An electric generator electric control assembly, characterized by, The generator control assembly comprises a generator body (100) connected with a gas turbine, a main outgoing line box (200) arranged at a side of the generator body (100), and an auxiliary terminal box (300) connected with the generator body (100) and arranged adjacent to the main outgoing line box (200), the main outgoing line box (200) is internally arranged with an outgoing line copper bar (210) connected with the generator body (100), a voltage mutual inductor (220) connected with the outgoing line copper bar (210) and used for converting high voltage into low voltage, a current mutual inductor (230) connected with the outgoing line copper bar (210), and an excitation current transformer (240) used for measuring excitation current and providing a feedback signal, and the auxiliary terminal box (300) is internally arranged with a terminal assembly and an excitation control loop used for excitation control.

2. The electric generator electric control assembly according to claim 1, characterized in that, The voltage mutual inductor (220) comprises a first voltage transformer and a second voltage transformer arranged at intervals in the main outgoing line box (200), an A end of a primary winding of the first voltage transformer is used for connecting an A phase of a high voltage line, an X end of the primary winding of the first voltage mutual inductor (220) is used for connecting a B phase of the high voltage line, an A end of a primary winding of the second voltage transformer is used for connecting the B phase of the high voltage line, an X end of the primary winding of the second voltage transformer is used for connecting a C phase of the high voltage line, an a end of a secondary winding of the first voltage transformer is used for leading out an A phase voltage signal, an a end of a secondary winding of the second voltage transformer is used for leading out a C phase voltage signal, and a b end of the secondary winding of the first voltage transformer and a b end of the secondary winding of the second voltage transformer are used for jointly leading out a B phase voltage signal.

3. The electric generator electric control assembly according to claim 1, characterized in that, The excitation current transformer (240) comprises a shell, a core arranged in the shell, a secondary winding wound on the core, a through hole for a high voltage cable to pass through arranged on the core, a first insulation layer arranged on an inner wall of the through hole, a second insulation layer arranged on an outer wall of the core, and a terminal arranged on the shell.

4. The electric generator electric control assembly of claim 1, wherein, The current mutual inductor (230) is a three-phase current transformer.

5. The electric generator control assembly of any of claims 1-4, wherein, The main outgoing line box (200) is internally arranged with a lightning arrester connected with the outgoing line copper bar (210) and used for grounding.

6. The electric generator electric control assembly of claim 5, wherein, The main outgoing line box (200) is provided with a grounding bolt connected with the lightning arrester.

7. The electric generator control assembly of any one of claims 1-4, wherein, The terminal assembly comprises voltage transformer secondary terminal, current transformer secondary terminal, excitation machine terminal, permanent magnet machine terminal, and temperature measuring resistance terminal.

8. The electric generator electric control assembly of claim 7, wherein, The excitation control loop comprises an excitation regulator used for excitation adjustment and connected with the voltage mutual inductor (220), the current mutual inductor (230), the excitation current transformer (240), the voltage transformer secondary terminal, the excitation machine terminal, and the permanent magnet machine terminal.

9. The electric generator control assembly of any of claims 1-4, wherein, The auxiliary terminal box (300) is further internally arranged with a radiator.

10. A gas turbine generator set characterized by, The generator control assembly comprises any one of claims 1-9.

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