CN109245563B - Power cabinet for static frequency conversion starting of large-capacity synchronous machine - Google Patents
Power cabinet for static frequency conversion starting of large-capacity synchronous machine Download PDFInfo
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- CN109245563B CN109245563B CN201811357103.8A CN201811357103A CN109245563B CN 109245563 B CN109245563 B CN 109245563B CN 201811357103 A CN201811357103 A CN 201811357103A CN 109245563 B CN109245563 B CN 109245563B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Motor And Converter Starters (AREA)
Abstract
The invention discloses a power cabinet for static variable frequency starting of a large-capacity synchronous machine, and belongs to the field of semiconductor current transformation technology and electric transmission. The power cabinet comprises a flat wave direct current reactor cabinet, one side of the flat wave direct current reactor cabinet is fixedly connected with a three-phase fully-controlled thyristor rectifier cabinet, the other side of the flat wave direct current reactor cabinet is fixedly connected with a thyristor inverter cabinet, the structures of the three-phase fully-controlled thyristor rectifier cabinet and the thyristor inverter cabinet are completely the same, and a rectifier circuit in the three-phase fully-controlled thyristor rectifier cabinet and an inverter circuit in the thyristor inverter cabinet are connected through two flat wave direct current reactors in the flat wave direct current reactor cabinet; the power cabinet provided by the invention has the advantages of reasonable layout, compact and simple structure, the thyristor module is a whole, the later maintenance is simple, and the requirement of series connection or parallel connection of high-voltage and high-current thyristor modules required by the starting of a large-capacity synchronous motor can be met.
Description
Technical Field
The invention belongs to the field of semiconductor current transformation technology and electric transmission, and particularly relates to a power cabinet for static variable-frequency starting of a high-capacity synchronous machine.
Background
At present, a large synchronous motor is a key device of national economy, and a static frequency conversion starting (LCI) device is generally adopted for soft starting of the large synchronous motor, namely a Load Commutated current source type frequency converter, so that the large synchronous motor is switched and connected to the grid after running to a synchronous rotating speed. A static frequency conversion starting (LCI) device is characterized in that three-phase alternating current is rectified through a thyristor full bridge to be changed into intermediate direct current voltage, and the intermediate direct current voltage is changed into three-phase alternating current with variable voltage and frequency through a thyristor inversion bridge group to be supplied to a motor stator winding, so that the purposes of starting a motor and running the motor to synchronous rotating speed are achieved. For the starting of a large-capacity synchronous motor, the voltage is high, the current is large, and the rectifier modules are required to be connected in series or in parallel, so that the frequency conversion starting system has more equipment, large floor area, high failure rate and large maintenance amount.
Disclosure of Invention
In view of the above problems, the present invention provides a power cabinet for static variable frequency starting of a large capacity synchronous machine, which employs a static variable frequency starting (LCI) device for variable frequency speed control of a large power synchronous machine.
The utility model provides a power cabinet for static frequency conversion of large capacity synchronous machine starts, includes flat wave direct current reactor cabinet, flat wave direct current reactor cabinet one side fixed connection three-phase full control thyristor rectifier cabinet, flat wave direct current reactor cabinet opposite side fixed connection thyristor inverter cabinet, wherein the structure in three-phase full control thyristor rectifier cabinet and the thyristor inverter cabinet is the same completely, includes two flat wave direct current reactors in the flat wave direct current reactor cabinet, gets up with the contravariant return circuit in the thyristor inverter cabinet with the rectification return circuit in the three-phase full control thyristor rectifier cabinet through flat wave direct current reactor.
Taking the thyristor inversion cabinet as an example, the thyristor inversion cabinet comprises a cabinet body, a thyristor module, a fan, a trigger and signal adapter plate, a capacitor, a resistor, a detection module and a wind collector; wherein trigger and signal keysets, electric capacity and resistance are located the upper portion of the internal portion of cabinet, thyristor module, detection module and wind collector are located the middle part of the internal portion of cabinet, the fan is located the lower part of the internal portion of cabinet.
The invention has the advantages that:
1. the power cabinet for static variable frequency starting of the large-capacity synchronous motor, provided by the invention, has a compact and simple structure, the thyristor module is an integral body, the later maintenance is simple, and the requirements of series connection or parallel connection of the high-voltage large-current thyristor modules required by starting of the large-capacity synchronous motor can be met.
2. The power cabinet for static variable frequency starting of the high-capacity synchronous machine, which is provided by the invention, adopts the thyristor as the main component of the thyristor power unit, and has low price and reliable performance; the optical pulse triggering system is adopted for the pulse triggering of the thyristor, the optical pulse triggering system takes the optical fiber as a medium for signal transmission, the isolation of high-voltage and low-voltage potentials is realized, the triggering and state monitoring of the thyristor are easier to realize, and meanwhile, the optical pulse triggering system has higher anti-interference performance and improves the reliability of the power cabinet.
3. The power cabinet for static variable frequency starting of the high-capacity synchronous machine, provided by the invention, has the advantages of reasonable layout, reasonable design of the ventilation duct and low failure rate of equipment, and improves the reliability and stability of soft starting of the synchronous machine.
Drawings
FIG. 1 is a side view distribution diagram of a power cabinet for static variable frequency starting of a high-capacity synchronous machine according to the present invention;
FIG. 2 is a front side view of a power cabinet for stationary variable frequency starting of a large capacity synchronous machine according to the present invention;
fig. 3 is a right side view of a power cabinet for static variable frequency starting of a large-capacity synchronous machine.
In the figure:
1. a cabinet body; 2. A thyristor module; 3. A fan;
4. a trigger and signal transfer board; 5. A capacitor; 6. A resistance;
7. a detection module; 8. An air collector; 9. A smoothing DC reactor.
Detailed Description
The power cabinet provided by the invention is described in detail below with reference to the accompanying drawings and embodiments.
The invention provides a power cabinet for static variable frequency starting of a large-capacity synchronous machine, which adopts a static variable frequency starting (LCI) device for variable frequency speed regulation of a high-power synchronous motor, is an AC-DC-AC current source type frequency converter, has simple structure and economic cost, and is widely applied to multi-megawatt high-power speed regulation transmission, in particular to high-voltage and high-speed high-power transmission. The thyristors used by the three-phase full-control thyristor rectifier cabinet and the thyristor inverter cabinet adopt optical pulse triggering systems to isolate high and low voltage sides, so that the power cabinet system has strong anti-interference capability. Due to the circuit configuration, the power cabinet itself is suitable for four-quadrant operation without any additional circuitry, i.e.: forward and reverse running and braking.
The invention provides a power cabinet for static variable frequency starting of a large-capacity synchronous machine, which comprises a flat wave direct current reactor cabinet, wherein one side of the flat wave direct current reactor cabinet is fixedly connected with a three-phase fully-controlled thyristor rectifier cabinet, the other side of the flat wave direct current reactor cabinet is fixedly connected with a thyristor inverter cabinet, the structures of the three-phase fully-controlled thyristor rectifier cabinet and the thyristor inverter cabinet are completely the same, a rectifier circuit is formed in the three-phase fully-controlled thyristor rectifier cabinet through electrical connection, an inverter circuit is formed in the thyristor inverter cabinet, two flat wave direct current reactors are arranged in the flat wave direct current reactor cabinet, and the rectifier circuit in the three-phase fully-controlled thyristor rectifier cabinet is connected with the inverter circuit in the thyristor inverter cabinet through the flat wave direct current reactors, as shown in figure 1.
As shown in fig. 2 and 3, taking the thyristor inverter cabinet as an example, the thyristor inverter cabinet includes a cabinet body 1, a thyristor module 2, a fan 3, a trigger and signal adapter plate 4, a capacitor 5, a resistor 6, a detection module 7 and a wind collector 8, the thyristor module 2 includes a bolt, a belleville spring, a screw sleeve, a bolt top support block, a thin insulator, a thyristor, a copper radiator, a thick insulator and a support frame; wherein trigger and signal keysets 4, electric capacity 5 and resistance 6 are located the upper portion of the internal portion of cabinet 1, thyristor module 2, detection module 7 and wind collector 8 are located the middle part of the internal portion of cabinet 1, fan 3 is located the lower part of the internal portion of cabinet 1, upper portion is the resistance-capacitance absorption district, and the middle part is wind collector 8 and thyristor work area in the thyristor module 2, and wind collector 8 forms the air-out passageway, cools off the thyristor that generates heat in the thyristor module 2, and the lower part is fan 3 cooling air inlet area. The cabinet body is formed by welding KB cabinet frames.
The thyristor module 2 comprises a support frame and three complete press piles; the supporting frame comprises a frame lower bracket, a frame side insulating support, a frame middle insulating support and a frame upper cover plate; the lower frame bracket is formed by welding steel plates and is used for placing a complete press pile; two insulating supports are arranged on the side surface of the frame and are respectively inserted into the fixing holes at the two ends of the lower bracket of the frame in a bilateral symmetry mode; two insulating supports are arranged in the middle of the frame and are respectively inserted into fixing holes at two trisection points on the lower bracket of the frame. The frame side insulating support and the frame middle insulating support divide the supporting frame into three spaces of left, middle and right. The inner side surface of the frame side surface insulation support is provided with a horizontal groove for supporting a copper radiator; the left surface and the right surface of the insulating support in the middle of the frame are both provided with horizontal grooves for supporting a copper radiator; the upper cover plate of the frame is formed by welding steel plates and is fixedly connected with the top of the side insulating support of the frame and the top of the middle insulating support of the frame to form a complete supporting frame.
The thyristor module 2 is characterized in that the medium-pressure stack comprises a bolt, a disc spring, a screw rod external member, a bolt top supporting block, a thin insulator, a thyristor, a copper radiator and a thick insulator, wherein a complete pressure stack is respectively arranged in three spaces of the left, the middle and the right of a supporting frame, the three complete pressure stacks are totally three, each complete pressure stack is respectively connected with the supporting frame, the structural layout of the three complete pressure stacks of the left, the middle and the right is completely the same, the specific layout takes the complete pressure stack of the left side as an example, the disc spring is placed on a through hole on the upper surface of a frame lower bracket in the space of the left side of the supporting frame, the middle of the disc spring is provided with a spring through; the screw rod sleeve is inserted into the spring through hole in the middle of the disc spring, and the upper half part of the screw rod sleeve reversely buckles the disc spring; the lower half part of the screw sleeve is axially provided with a flat groove which is matched with a surface through hole of a lower bracket of the frame and ensures that the screw sleeve does not rotate, and the screw sleeve can move up and down relative to the surface through hole; the middle of the screw rod suite is provided with a threaded through hole, a bolt is screwed into the threaded through hole in the middle of the screw rod suite from the lower surface of the lower bracket of the frame, the bolt is screwed out of the threaded through hole in the middle of the screw rod suite until the bolt is exposed out of the upper part of the screw rod suite for a certain distance, a bolt top supporting block is arranged at the top end of the bolt, one surface of the bolt top supporting block, which is contacted with the bolt, is a spherical concave surface, the top surface of the bolt top supporting block is a plane, then a thin insulator is horizontally arranged on the plane of the bolt top supporting block, and; the thin insulator is used for insulating a copper radiator with the electrified lowest end and a bolt top supporting block, all the copper radiators are identical in size, and all the thyristors are identical in size. Finally, a thick insulator is placed on the upper end face of the copper radiator positioned at the uppermost end, and the thick insulator is used for insulating the copper radiator with the charged uppermost end and the upper cover plate of the frame; and continuously rotating the bolt, and pressing all the copper radiators and all the thyristors together to form a complete press stack through the matching among the bolt, the screw sleeve and the disc spring. The invention uses the thyristor (controllable silicon) as a module unit of the power device, has reasonable layout, compact structure, high power density and strong output current capability, and can be used as a rectification module and an inversion module.
After the thyristor module 2 is fixed in the middle of the cabinet body 1, the fan 3 is installed on the lower portion of the cabinet body 1, when the fan 3 works, cooling air is blown into the air collector 8 in the vertical direction, the cooling air in the air collector 8 transversely passes through the sheet-shaped gaps of the copper radiators, hot air is taken to the rear and the upper portion of the thyristor module 2, and the hot air is discharged through shutters at the top and the rear of the cabinet body, so that the aims of low temperature rise and good heat dissipation of the thyristor during working are fulfilled.
The trigger and signal adapter plate 4 is used for controlling the thyristor to be triggered in a pulse mode, the thyristor adopts an optical pulse trigger system, the optical fiber is used as a signal transmission medium, the isolation of high-voltage and low-voltage potentials is achieved, the triggering and state monitoring of the thyristor are achieved more easily, meanwhile, the optical pulse trigger system has higher anti-interference performance, and the reliability of the power cabinet is improved.
In fig. 3, a capacitor 5 and a resistor 6 form a resistance-capacitance absorption loop, which is located at the upper part of the cabinet body 1 and used for overvoltage protection, and the heat generated by the resistance-capacitance absorption loop and the heat generated by the thyristor can be exhausted out of the cabinet through an air duct.
The detection module 7 is a machine side current detection element, is directly connected to the AC busbar, and transmits detected current data to the thyristor control system after current detection.
The thyristor in the three-phase fully-controlled thyristor rectifier cabinet is completely the same as the thyristor in the thyristor inverter cabinet, the structural layout is also the same, a rectification loop with a rectification function is formed in the three-phase fully-controlled thyristor rectifier cabinet and an inversion loop with an inversion function is formed in the thyristor inverter cabinet through different electrical connection modes, two flat wave direct current reactors 9 are arranged in the flat wave direct current reactor cabinet, the rectification loop in the three-phase fully-controlled thyristor rectifier cabinet is connected with the inversion loop in the thyristor inverter cabinet through the flat wave direct current reactors 9, the current rise rate of a direct current bus in the flat wave direct current reactor cabinet is limited, and flat wave current limiting is realized.
By analyzing and grasping the structural characteristics of the power cabinet for high-capacity static variable frequency starting, the power cabinet is designed for the static variable frequency starting (LCI) of a high-capacity synchronous machine, has high power density, compact structure, strong output current capability and reasonable air duct design and layout, and can well meet the requirements of replacing and maintaining the fan 3.
Claims (5)
1. A power cabinet for static frequency conversion starting of a large-capacity synchronous machine is characterized by comprising a flat wave direct current reactor cabinet, wherein one side of the flat wave direct current reactor cabinet is fixedly connected with a three-phase fully-controlled thyristor rectifier cabinet, the other side of the flat wave direct current reactor cabinet is fixedly connected with a thyristor inverter cabinet, the three-phase fully-controlled thyristor rectifier cabinet and the thyristor inverter cabinet have the same structure, two flat wave direct current reactors are arranged in the flat wave direct current reactor cabinet, and a rectifying loop in the three-phase fully-controlled thyristor rectifier cabinet is connected with an inverter loop in the thyristor inverter cabinet through the flat wave direct current reactors;
the thyristor inversion cabinet comprises a cabinet body, a thyristor module, a fan, a trigger and signal adapter plate, a capacitor, a resistor, a detection module and a wind collector; the trigger and signal adapter plate, the capacitor and the resistor are positioned at the upper part of the interior of the cabinet body, the thyristor module, the detection module and the wind collector are positioned at the middle part of the interior of the cabinet body, and the fan is positioned at the lower part of the interior of the cabinet body;
the thyristor module comprises a support frame and three complete press piles; the supporting frame comprises a frame lower bracket, a frame side insulating support, a frame middle insulating support and a frame upper cover plate; the lower frame bracket is formed by welding steel plates and is used for placing a complete press pile; two insulating supports are arranged on the side surface of the frame and are respectively inserted into the fixing holes at the two ends of the lower bracket of the frame in a bilateral symmetry mode; two insulating supports are arranged in the middle of the frame and are respectively inserted into fixing holes at two trisection points on the lower bracket of the frame; the frame side insulating support and the frame middle insulating support divide the support frame into a left space, a middle space and a right space; the inner side surface of the frame side surface insulation support is provided with a horizontal groove for supporting a copper radiator; the left surface and the right surface of the insulating support in the middle of the frame are both provided with horizontal grooves for supporting a copper radiator; the upper cover plate of the frame is formed by welding steel plates and is fixedly connected with the side insulating supports of the frame and the top of the middle insulating support of the frame to form a complete supporting frame;
the thyristor module medium-pressure stack comprises a bolt, a disc spring, a screw rod external member, a bolt top supporting block, a thin insulator, a thyristor, a copper radiator and a thick insulator, wherein a complete pressure stack is respectively arranged in three spaces of the left, the middle and the right of a supporting frame, the three complete pressure stacks are totally arranged, each complete pressure stack is respectively connected with the supporting frame, the structural layout of the three complete pressure stacks of the left, the middle and the right is completely the same, the specific layout takes the complete pressure stack on the left side as an example, the disc spring is placed on a through hole on the upper surface of a frame lower bracket in the space on the left side of the supporting frame, and a spring through hole is formed in the middle; the screw rod sleeve is inserted into the spring through hole in the middle of the disc spring, and the upper half part of the screw rod sleeve reversely buckles the disc spring; the lower half part of the screw sleeve is axially provided with a flat groove which is matched with a surface through hole of the lower bracket of the frame, the screw sleeve does not rotate, and the screw sleeve can move up and down relative to the surface through hole; the middle of the screw rod suite is provided with a threaded through hole, a bolt is screwed into the threaded through hole in the middle of the screw rod suite from the lower surface of the lower bracket of the frame, the bolt is screwed out of the threaded through hole in the middle of the screw rod suite until the bolt is exposed out of the upper part of the screw rod suite for a certain distance, a bolt top supporting block is arranged at the top end of the bolt, one surface of the bolt top supporting block, which is contacted with the bolt, is a spherical concave surface, the top surface of the bolt top supporting block is a plane, then a thin insulator is horizontally arranged on the plane of the bolt top supporting block, and; the thin insulator is used for insulating a copper radiator with the electrified lowest end and a bolt top supporting block, the sizes of all the copper radiators are completely the same, and the sizes of all thyristors are completely the same; finally, a thick insulator is placed on the upper end face of the copper radiator positioned at the uppermost end, and the thick insulator is used for insulating the copper radiator with the charged uppermost end and the upper cover plate of the frame; and continuously rotating the bolt, and pressing all the copper radiators and all the thyristors together to form a complete press stack through the matching among the bolt, the screw sleeve and the disc spring.
2. The power cabinet for high-capacity synchronous machine static frequency conversion starting as claimed in claim 1, wherein the thyristor adopts a light pulse triggering mode and uses an optical fiber as a signal transmission medium.
3. The power cabinet for high capacity synchronous machine stationary variable frequency starting as claimed in claim 1, wherein when the fan is operated, the cooling air is blown vertically into the air collector, the cooling air in the air collector is then passed transversely through the slots of the copper radiator, and the hot air is brought behind and above the thyristor module and exhausted through the top and rear of the cabinet.
4. The power cabinet for high capacity synchronous machine stationary variable frequency starting as claimed in claim 1, wherein said cabinet body is welded by KB cabinet frame.
5. The power cabinet for high-capacity synchronous machine static frequency conversion starting as claimed in claim 1, wherein the detection module is directly connected to the AC busbar, and transmits detected current data to the thyristor control system after current detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811357103.8A CN109245563B (en) | 2018-11-15 | 2018-11-15 | Power cabinet for static frequency conversion starting of large-capacity synchronous machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811357103.8A CN109245563B (en) | 2018-11-15 | 2018-11-15 | Power cabinet for static frequency conversion starting of large-capacity synchronous machine |
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| Publication Number | Publication Date |
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| CN109245563A CN109245563A (en) | 2019-01-18 |
| CN109245563B true CN109245563B (en) | 2020-06-23 |
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| CN201811357103.8A Active CN109245563B (en) | 2018-11-15 | 2018-11-15 | Power cabinet for static frequency conversion starting of large-capacity synchronous machine |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020017033A1 (en) * | 2018-07-20 | 2020-01-23 | 東芝三菱電機産業システム株式会社 | Electric power converter |
| CN112152424B (en) * | 2020-08-10 | 2022-02-08 | 常州博瑞电力自动化设备有限公司 | Compact air-cooled static frequency converter power cabinet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8254076B2 (en) * | 2009-06-30 | 2012-08-28 | Teco-Westinghouse Motor Company | Providing modular power conversion |
| CN102097941B (en) * | 2010-12-30 | 2012-12-26 | 冶金自动化研究设计院 | Dual PWM (pulse width modulation) integrated gate commutated thyristor three-level power cabinet |
| CN203590000U (en) * | 2013-09-30 | 2014-05-07 | 天津瑞能电气有限公司 | Full power frequency converter |
| CN204349814U (en) * | 2014-12-18 | 2015-05-20 | 江苏方程电力科技有限公司 | A kind of photovoltaic DC-to-AC converter of integrated DC distribution |
| CN207677619U (en) * | 2017-12-13 | 2018-07-31 | 武汉合康电驱动技术有限公司 | A kind of parallel frequency changer of low-voltage module |
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