CN211557161U - Frequency conversion device for researching load current conversion starting mode of gas turbine - Google Patents
Frequency conversion device for researching load current conversion starting mode of gas turbine Download PDFInfo
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- CN211557161U CN211557161U CN201922188290.8U CN201922188290U CN211557161U CN 211557161 U CN211557161 U CN 211557161U CN 201922188290 U CN201922188290 U CN 201922188290U CN 211557161 U CN211557161 U CN 211557161U
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Abstract
A frequency conversion device for researching a load current conversion starting mode of a gas turbine belongs to the technical field of semiconductor switches. Comprises a front part, a middle part and a rear part, wherein the front part is a phase change absorption and pulse adapter plate (4); the middle part comprises 6 alternating current input busbars, 3 alternating current output busbars, 2 intermediate circuit direct current busbars and a busbar bracket; the rear part comprises a rectification module (6), a cooling fan (3) and a radiator (12); the phase-change absorption and pulse adapter plate (4) at the front part of the device is fixed on a bent bracket at the side surface of the box body (2), nine phase-change absorption resistors and capacitors of the rectifier module (6) are arranged on the box body (2), and a pulse adapter terminal row from a control system is also arranged. The device has the advantages that the device is the miniaturization of a power loop of a gas turbine load commutation starting mode, the topological structure of the load commutation 12/6 is integrated in a small box, and the structure is simple and compact.
Description
Technical Field
The utility model belongs to the technical field of the semiconductor switch, a research gas turbine load current conversion starting mode's frequency conversion device is provided, applicable in the starting of 3 ~ 250 kW's synchronous machine group, the device starts aspect principle and application problem to research and solution gas turbine load current conversion, has practical meaning.
Background
The gas turbine generator set equipment has large usage amount in China and plays an important role in the fields of power generation, power grid regulation and the like. At present, the starting mode of the gas turbine mostly adopts a load commutation mode to start, so that the capacity of a starting frequency converter can be reduced, and the requirement on the change of the rotating speed in the starting process can be met. The capacity of the starting device of the gas turbine is usually about 4-7.5 MW, the 12/6 topological structure is adopted, the output voltage is 0-1.8 kV, and the frequency is 0-35 Hz. However, most of the existing gas turbine starting devices rely on foreign imported products, and in order to develop a domestic gas turbine load conversion starting frequency conversion device, a small-capacity test platform needs to be built, so that the principle and practical application problems of the technology are researched in a targeted manner. The utility model is used for realize this purpose.
SUMMERY OF THE UTILITY MODEL
The utility model provides a research gas turbine load current conversion starting mode's frequency conversion device builds a small capacity's test platform for the analysis and the research of this technique localization in-process.
The utility model comprises a front part, a middle part and a rear part, wherein the front part is a phase-change absorption and pulse adapter plate 4; the middle part comprises 6 alternating current input busbars, 3 alternating current output busbars, 2 intermediate circuit direct current busbars and a busbar bracket; the rear part comprises a rectifying module 6, a cooling fan 3 and a radiator 12, the cooling fan 3 is arranged above the radiator 12, and the radiator 12 and the cooling fan take away heat loss generated when the rectifying module 6 works, so that the temperature rise of the rectifying module is effectively controlled.
The commutation absorption and pulse adapter plate 4 at the front part of the device is fixed on a bent bracket at the side surface of the box body 2, and nine commutation absorption resistors and capacitors of the rectifier module 6 and a pulse adapter terminal bank from a control system are arranged on the box body 2.
The middle part of the device is a busbar, and for the purposes of compact structure and convenient wiring, the busbar is divided into an upper layer and a lower layer, wherein the upper layer is an alternating current input 1L1 busbar 13, a 2L1 busbar 14, a 1L2 busbar 15, a 2L2 busbar 16, a 1L3 busbar 17, a 2L3 busbar 18 and a middle 1L + direct current busbar which are all fixed on an upper busbar bracket 20; the lower layer is an alternating current output U bus bar 8, a V bus bar 9, a W bus bar 10 and a middle 2L + direct current bus bar which are all fixed on a lower bus bar bracket 21. Nine thyristors are distributed into 3 rows, and the second binding post 2A and the third binding post 3A of each row of three rectifying modules 6 are connected by a busbar to form a direct-current short-circuit busbar 7.
Nine thyristor rectifier modules 6 at the rear part of the frequency conversion device are fixed on a radiator 12, and the radiator 12 is fixed with the machine shell through four fixing screws 22. The fan mounting plate 5 is arranged above the radiator 12, 2 cooling fans 3 are mounted on the fan mounting plate 5, the radiator 12, the fan mounting plate 5 and the cooling fans 3 form a heat dissipation air channel, the fans are in an air draft mode from the top, heat loss during the work of the rectifier module is guaranteed to be timely dissipated into the air through the heat dissipation air channel, and the rectifier module is guaranteed to normally work.
The utility model discloses a 12/6's topological structure divide into rectification part, middle direct current return circuit and contravariant part, and the rectification part comprises 12 looks commutations by two three-phase full-bridge rectification series connection, and wherein V1 ~ V3 constitute the three-phase full-bridge rectification of D group, and V4 ~ V6 constitute the three-phase full-bridge rectification of Y group, and D group and Y group power supply transformer will differ 30 degrees angle differences, and 12 looks commutations will exchange and change into the direct current. The intermediate direct current loop is provided with a smoothing reactor to reduce the current change rate. The direct current loop is converted into 3-phase alternating current power which meets the requirement through a 6-phase inverter circuit formed by V7-V9 and is supplied to a generator stator winding of the gas turbine.
The utility model has the advantages that:
(1) the problem of load commutation starting of the gas turbine is researched by establishing a small test platform, so that the investment is low, and the operation is practical and efficient.
(2) The 12/6 topological structure of the load commutation frequency conversion mode is intensively arranged in a small box body, the structure is simple and compact, the commutation absorption and pulse adapter plate is arranged on the rectifier module, the layout is reasonable, the wiring is nearest, the system is stable and reliable, and the failure rate is low.
Drawings
Fig. 1 is a side view of a frequency converter for studying a load commutation starting mode of a gas turbine according to the present invention.
Fig. 2 is a front view of the frequency converter for studying the load commutation starting mode of the gas turbine according to the present invention.
Fig. 3 is a side view of an oblique axis of the frequency converter of the present invention for studying the load commutation starting mode of the gas turbine.
Fig. 4 is a plan view of an oblique axis of the frequency converter according to the present invention for studying the load commutation starting mode of the gas turbine.
Fig. 5 is a schematic circuit diagram of a frequency converter for studying a load commutation starting mode of a gas turbine according to the present invention.
Fig. 6 is a circuit schematic of a rectifier module.
In the figure, a front cover plate 1, a box body 2, a fan 3, a commutation absorption and pulse adapter plate 4, a fan mounting plate 5, a rectifier module 6, a direct current short-circuit busbar 7, an alternating current output U busbar 8, an alternating current output V busbar 9, an alternating current output W busbar 10, a middle 2L + direct current busbar 11, a radiator 12, an alternating current input 1L1 busbar 13, an alternating current input 2L1 busbar 14, an alternating current input 1L2 busbar 15, an alternating current input 2L2 busbar 16, an alternating current input 1L3 busbar 17, an alternating current input 2L3 busbar 18, a 19-middle 1L + busbar, an upper busbar support 20, a lower busbar support 21, a fixing screw 22, a thyristor first terminal 1A, a thyristor second terminal 2A and a thyristor third terminal 3A.
V1-V3 are D groups of rectifier modules, R11-R16 and C11-C16 are phase-change absorption resistors and capacitors, V4-V6 are Y groups of rectifier modules, R21-R26 and C21-C26 are phase-change absorption resistors and capacitors, V7-V9 are inverter modules, R31-R36 and C31-C36 are phase-change absorption resistors and capacitors.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
The utility model relates to a frequency conversion equipment of research gas turbine load conversion of current, applicable in the starting of 3 ~ 250 kW's synchronous machine group, to research and solve gas turbine load conversion of current start aspect principle and application problem.
The utility model discloses a load current conversion frequency conversion mode's 12/6 topological structure divide into rectification part, middle direct current return circuit and contravariant part, and the rectification part comprises 12 looks commutations by two three-phase full-bridge rectification series connections, and middle direct current return circuit has the smoothing reactor, through the 6 looks inverter circuit that V7 ~ V9 constitute, changes the direct current into the 3 looks alternating currents that satisfy needs.
As shown in fig. 1 to 4, the box is placed in a frame with the box size of 450mm by 330mm by 230mm in height by width by depth.
The device is divided into a front part, a middle part and a rear part, and the front part is provided with a phase change absorption and pulse adapter plate 4. The middle part is an alternating current input busbar, an alternating current output busbar, a middle circuit direct current busbar and a busbar bracket. The rear part is provided with a rectifying module 6 and a radiator 12, a cooling fan 3 is arranged above the radiator, and the radiator and the cooling fan take away heat loss generated when the rectifying module works, so that the temperature rise of the rectifying module is effectively controlled.
The front of the device is a commutation absorption and pulse adapter plate 4 which is fixed on a bending bracket on the side surface of the box body 2, and the upper part is a commutation absorption resistor and a capacitor of nine rectifier modules 6 and a pulse adapter terminal row from a control system.
The middle part of the device is a busbar, and for the purposes of compact structure and convenient wiring, the busbar is divided into an upper layer and a lower layer, wherein the upper layer is an alternating current input 1L1 busbar 13, a 2L1 busbar 14, a 1L2 busbar 15, a 2L2 busbar 16, a 1L3 busbar 17, a 2L3 busbar 18 and a middle 1L + direct current busbar which are all fixed on an upper busbar bracket 20; the lower layer is an alternating current output U bus bar 8, a V bus bar 9, a W bus bar 10 and a middle 2L + direct current bus bar which are all fixed on a lower bus bar support 21, nine thyristors are distributed into 3 rows, and a second binding post 2A and a third binding post 3A of each row of three rectifying modules 6 are connected through the bus bars to form a direct current short circuit bus bar 7.
The back of the device is nine thyristor rectifier modules 6 fixed on a radiator 12, and the radiator is fixed with the machine shell through four fixing screws 22. The fan mounting plate 5 is arranged above the radiator, 2 cooling fans 3 are mounted on the fan mounting plate 5, the radiator 12, the fan mounting plate 5 and the cooling fans 3 form a heat dissipation air channel, the fans are in an air draft mode from the top, heat loss when the rectifier module works is guaranteed to be timely dissipated into air through the heat dissipation air channel, and the rectifier module is guaranteed to normally work.
As shown in the schematic circuit diagrams of fig. 5 and 6, the specific connections are that V1-V9 are rectifier modules, each rectifier module comprises two thyristors connected in series, and each rectifier module has three terminal posts, the second terminal post 2A is the cathode K of the first thyristor, the third terminal post 3A is the anode a of the second thyristor, and the first terminal post 1A is an ac incoming line end. G1, K1 are pulse trigger terminals of the first thyristor, and G2, K2 are pulse trigger terminals of the second thyristor.
3 rows of rectification modules are distributed on the radiator, and the three middle rectification modules are V1-V3 rectification modules; the three upper parts are V4-V6 rectifying modules; the three rectifier modules from V7 to V9 are arranged below.
The V1-V3 rectifier modules form a D group three-phase full-bridge rectifier, a terminal 2A and a terminal 3A of the V1-V3 rectifier modules are connected by a busbar, and a terminal 1A of the V1-V3 rectifier modules is respectively connected with a 1L1, a 1L2 and a 1L3 alternating-current busbar of the D group.
The V4-V6 rectifier modules form Y groups of three-phase full-bridge rectifiers, a binding post 2A and a binding post 3A of the V4-V6 rectifier modules are connected through busbars, and a binding post 1A of the V4-V6 rectifier modules is respectively connected with 2L1, 2L2 and 2L3 alternating-current busbars of the Y groups.
The terminal 2A (cathode K) of the V1-V3 rectifying module is connected with the terminal 3A (anode A) of the V4-V6 rectifying module through a busbar to form 12-phase rectification, alternating current is converted into direct current, and power is supplied to a V7-V9 inverter loop. The binding post 3A (anode A) of the V1-V3 rectifying module is connected with the binding post 2A (cathode K) of the V7-V9 rectifying module through a busbar.
The V7-V9 rectification modules form a three-phase full-bridge inversion circuit, a binding post 2A and a binding post 3A of the V7-V9 rectification modules are connected through a busbar, direct current is converted into alternating current through the inversion circuit, the binding posts 1A of the V7-V9 rectification modules are respectively connected with a U, V, W alternating current busbar, and the U, V and W alternating current busbars are connected with a stator winding of a gas turbine generator.
A binding post 3A (anode A) of the V7-V9 rectifying module leads out a direct current bus bar 2L + to be connected with a direct current reactor LA, a binding post 2A (cathode K) of the V4-V6 rectifying module leads out a direct current bus bar 1L + to be connected with the direct current reactor LA, and the direct current reactor is installed outside a box body.
R11-R16 and C11-C16 are commutation absorption resistors and capacitors of a rectifier module from V1-V3, R21-R26 and C21-C26 are commutation absorption resistors and capacitors of a rectifier module from V4-V6, and R31-R36 and C31-C36 are commutation absorption resistors and capacitors of a rectifier module from V7-V9.
Claims (2)
1. A frequency conversion device for researching a load commutation starting mode of a gas turbine is characterized by comprising a front part, a middle part and a rear part, wherein the front part is a commutation absorption and pulse adapter plate (4); the middle part comprises 6 alternating current input busbars, 3 alternating current output busbars, 2 intermediate circuit direct current busbars and a busbar bracket; the rear part comprises a rectification module (6), a cooling fan (3) and a radiator (12);
the phase-change absorption and pulse adapter plate (4) at the front part of the device is fixed on a bending bracket at the side surface of the box body (2), nine phase-change absorption resistors and capacitors of the rectifier module (6) are arranged on the box body (2), and a pulse adapter terminal row from a control system is also arranged on the box body;
the middle part of the device is a busbar which is divided into an upper layer and a lower layer, the upper layer is an alternating current input 1L1 busbar (13), a 2L1 busbar (14), a 1L2 busbar (15), a 2L2 busbar (16), a 1L3 busbar (17), a 2L3 busbar (18), and the middle 1L + direct current busbar is fixed on an upper busbar bracket (20); the lower layer is an alternating current output U bus bar (8), a V bus bar (9), a W bus bar (10) and a middle 2L + direct current bus bar which are all fixed on a lower bus bar bracket (21), nine thyristors are distributed into three rows, and a second binding post 2A and a third binding post 3A of each row of three rectifying modules (6) are connected by the bus bars to form a direct current short circuit bus bar (7);
nine thyristor rectifier modules (6) at the rear part of the frequency conversion device are fixed on a radiator (12), and the radiator (12) is fixed with the shell through four fixing screws (22); a fan mounting plate (5) is arranged above the radiator (12), 2 cooling fans (3) are mounted on the fan mounting plate (5), and the radiator (12), the fan mounting plate (5) and the cooling fans (3) form a heat dissipation air duct.
2. The frequency conversion device for researching the load commutation starting mode of the gas turbine as claimed in claim 1, wherein the structure of the device is 12/6 topology structure, and the frequency conversion device is divided into a rectification part, an intermediate direct current loop and an inversion part, the rectification part is formed by connecting two three-phase full-bridge rectifiers in series to form a 12-phase rectification, wherein V1-V3 form a D group of three-phase full-bridge rectification, V4-V6 form a Y group of three-phase full-bridge rectification, the D group and the Y group of power supply transformers have an angle difference of 30 degrees, and the 12-phase rectification converts alternating current into direct current; the intermediate direct current loop is provided with a smoothing reactor, and the direct current loop converts direct current into required 3 alternating current to be supplied to a generator stator winding of the gas turbine through a 6-phase inverter circuit formed by V7-V9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922188290.8U CN211557161U (en) | 2019-12-09 | 2019-12-09 | Frequency conversion device for researching load current conversion starting mode of gas turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922188290.8U CN211557161U (en) | 2019-12-09 | 2019-12-09 | Frequency conversion device for researching load current conversion starting mode of gas turbine |
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| Publication Number | Publication Date |
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| CN211557161U true CN211557161U (en) | 2020-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922188290.8U Active CN211557161U (en) | 2019-12-09 | 2019-12-09 | Frequency conversion device for researching load current conversion starting mode of gas turbine |
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