CN116418032A - Turbine power generation high-voltage asynchronous grid connection method and device - Google Patents
Turbine power generation high-voltage asynchronous grid connection method and device Download PDFInfo
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- CN116418032A CN116418032A CN202211311256.5A CN202211311256A CN116418032A CN 116418032 A CN116418032 A CN 116418032A CN 202211311256 A CN202211311256 A CN 202211311256A CN 116418032 A CN116418032 A CN 116418032A
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- 238000010248 power generation Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 7
- 238000004146 energy storage Methods 0.000 claims description 9
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
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- 238000004519 manufacturing process Methods 0.000 abstract description 6
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- 239000002918 waste heat Substances 0.000 description 5
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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Abstract
The invention discloses a high-voltage asynchronous grid-connected method and device for turbine power generation. The high-voltage asynchronous grid-connected cabinet circuit is interlocked with the high-voltage outlet cabinet circuit, namely, a high-voltage circuit breaker of the high-voltage outlet cabinet is not switched on, and the high-voltage asynchronous grid-connected cabinet high-voltage grid-connected circuit breaker cannot be switched on; the high-voltage circuit breaker of the high-voltage outlet cabinet trips, and the high-voltage grid-connected circuit breaker of the high-voltage asynchronous grid-connected cabinet trips simultaneously. The grid connection process reduces impact on the power grid by setting the automatic grid connection judgment logic of the high-voltage asynchronous power generation grid connection cabinet and setting the grid connection rotating speed condition, and the power grid is automatically and quickly integrated, so that the operation of other existing devices in a production plant is not affected.
Description
Technical Field
The invention relates to the technical field of turbine power generation, in particular to a high-voltage asynchronous grid-connected method and device for turbine power generation.
Background
With the increasing emphasis of residual pressure waste heat utilization, especially the project demand of adopting turbine to generate electricity increases in a large scale, moreover, the generating power of a single generating set is also increased, the capacity of the power grid designed by factory electricity of a production device is generally limited, the larger the power of the generating set is, the larger the disturbance to the power grid is, the larger the adaptability of the power grid to the generating set is, the worse the power of the generating set is, the power grid is possibly impacted when the generating system is integrated into the power grid, and the generating system cannot be safely, automatically and quickly integrated into the power grid.
In order to respond to the energy conservation and emission reduction policies, the residual pressure waste heat utilization degree of some production device factories in the production line which is finished or operated for many years is high, and the residual pressure waste heat power generation becomes a direction for technically changing the production line. Because the residual pressure waste heat is utilized, an engineering design main body which often generates the residual pressure waste heat is finished or operated for many years, the existing high-voltage distribution device cannot be changed too much in the process of implementing grid connection, the operation of other existing devices in a production plant cannot be influenced, and the rapid and friendly access of the generated power to a high-voltage power grid through a high-voltage cabinet is always a urgent problem to be solved.
On the other hand, the types of the high-voltage cabinets are various, and the structural details of the high-voltage cabinets of different types are different. In the face of different types of high-voltage cabinets, operators have a screen assembly obstacle without knowing the cabinet structure. When the structural drawing of the high-voltage distribution device to be combined is lost, the connection of the high-voltage cabinet and the high-voltage distribution device to be combined becomes a difficult problem.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the turbine power generation high-voltage asynchronous grid-connected device which is reliable, simple, safe and stable in operation, capable of being automatically integrated into a power grid quickly and friendly, simple and convenient to operate and maintain, capable of reducing the power load of a plant, and capable of saving energy and reducing consumption.
The technical scheme of the invention is as follows: a turbine power generation high-voltage asynchronous grid-connected method is characterized in that a high-voltage circuit breaker is in a switching-on state through a second control circuit of a high-voltage outlet cabinet; the turbine inlet valve in the turbine power generation unit is started to rotate the turbine through the control system, the speed reducer is driven to rotate so as to drag the high-voltage asynchronous motor to rotate, the control system collects data of the speed measuring sensor, the pressure measuring sensor and the temperature measuring sensor, corresponding set values are arranged in the control system, an interlocking signal is triggered when the set values are exceeded, the turbine inlet valve is closed, and the high-voltage grid-connected circuit breaker trips; the corresponding set value refers to the rated rotation speed of the turbine; when a speed measurement sensor acquired by a control system reaches a speed set value of the control system, the speed set value refers to that the turbine speed is greater than 95% of the rated turbine speed and less than 99% of the rated turbine speed, the control system sends a starting signal of the high-voltage asynchronous motor to a first control circuit of the high-voltage asynchronous power generation grid-connected cabinet, the starting signal refers to a switching-on signal sent by the control system, the first switching-on circuit of the control circuit sends a switching-on signal, a high-voltage grid-connected breaker switches on, the high-voltage asynchronous motor is connected with a 10KV power grid, and a starting grid-connected process is completed; the high-voltage asynchronous power generation grid-connected cabinet is isolated from a 10KV power grid through a high-voltage outlet cabinet; the high-voltage comprehensive protection device collects a voltage signal of a PT small bus on the top of the cabinet, collects a current signal of a current transformer, collects a current signal of a zero-sequence current transformer, judges whether overvoltage, low voltage, overcurrent, overload and zero-sequence overcurrent conditions exist or not, and trips a high-voltage grid-connected breaker if a protection trip signal exists; the high-voltage comprehensive protection device collects a voltage signal of a PT small bus on the top of the cabinet, collects a current signal of a current transformer and judges whether overvoltage, low voltage and overcurrent conditions exist or not, if the overvoltage, low voltage and overcurrent conditions exist, a tripping signal is sent to trip the high-voltage circuit breaker, and meanwhile, the tripping signal is sent to a tripping circuit of the control circuit, and the high-voltage grid-connected circuit breaker is tripped.
The first control circuit of the high-voltage asynchronous generation grid-connected cabinet is provided with a switching-on permission loop, and comprises a 220VAC power supply provided by a cabinet top control small bus, a working position signal of the high-voltage asynchronous generation grid-connected cabinet, an energy storage signal of a high-voltage grid-connected circuit breaker, a switching-on state signal of a high-voltage outlet cabinet, a grounding knife position signal, a control system permission signal and a switching-on permission intermediate relay; when the working position signal of the high-voltage asynchronous power generation grid-connected cabinet is in a working position, namely a signal closing state, the energy storage signal of the high-voltage grid-connected circuit breaker is stored, namely a signal closing state, the closing state signal of the high-voltage outlet cabinet is in a closing state, namely a signal closing state, the grounding knife position signal is in a separating state, namely a signal closing state, and the control system allows the signal to be in a permission state, namely a signal closing state, and the closing permission intermediate relay is in a power-on state; the closing allowable loop is used as a precondition for the high-voltage grid-connected breaker to be closed.
The first control circuit of the high-voltage asynchronous generation grid-connected cabinet is provided with a switching-on circuit, and comprises a 220VAC power supply provided by a small bus controlled by a cabinet top, a switching-on signal, a first high-voltage comprehensive protection, an auxiliary contact of a switching-on allowable intermediate relay and a switching-on coil of a high-voltage grid-connected circuit breaker, wherein when the switching-on signal of the control system is in a signal switching-on state, the auxiliary contact of the switching-on allowable intermediate relay is in a signal switching-on state, the high-voltage comprehensive protection has no tripping signal, and the switching-on coil of the high-voltage grid-connected circuit breaker is switched on; the first control circuit of the high-voltage asynchronous generation grid-connected cabinet is provided with a tripping circuit, and comprises a 220VAC power supply provided by a small bus controlled by a cabinet top, a tripping signal of a high-voltage comprehensive protection device II, a tripping coil of a high-voltage grid-connected circuit breaker which are connected with each other, wherein when the tripping signal of the control system is in a signal closing state or the tripping signal of the high-voltage comprehensive protection device II is in a tripping action of the tripping coil of the high-voltage grid-connected circuit breaker.
The PT voltage transformer takes 10KV voltage A, B, C of the second high-voltage cable and reduces the voltage to 100V to form a cabinet top PT small bus, and the cabinet top PT small bus is respectively connected with the first high-voltage comprehensive protector and the second high-voltage comprehensive protector to provide three-phase voltage signals; the small PT bus on the top of the cabinet is used for providing a 10KV system voltage signal converted by a PT voltage transformer for the first high-voltage comprehensive protection and the second high-voltage comprehensive protection; the control transformer takes the 10KV voltage A, C of the second high-voltage cable to be reduced to 220V, and is connected with a UPS power supply to form a cabinet top control busbar, and the cabinet top control busbar is respectively connected with the first high-voltage comprehensive protection device, the second high-voltage comprehensive protection device, the first control circuit and the second control circuit to provide 220VAC control power supply. The cabinet top control busbar functions to form a cabinet top busbar arrangement structure, so that PT signals and operation power supply splicing cabinet installation wiring are facilitated.
The high-voltage asynchronous grid-connected device for turbine power generation comprises a high-voltage outlet cabinet, a high-voltage asynchronous power generation grid-connected cabinet, a turbine power generation unit, a control system, a high-voltage cable and a 10KV power grid; the turbine power generation unit comprises a turbine expander, a turbine air inlet valve is connected with a turbine inlet, a turbine shaft work output end is connected with a high-speed end of a speed reducer, a low-speed end of the speed reducer is connected with a high-voltage asynchronous motor, the power generation output of the high-voltage asynchronous motor is connected with a high-voltage asynchronous power generation grid-connected cabinet through a high-voltage cable and a grid-connected breaker input end, the high-voltage asynchronous power generation grid-connected cabinet grid-connected breaker output end is connected with a high-voltage circuit breaker input end of a high-voltage outlet cabinet through a high-voltage busbar, and the high-voltage circuit breaker output end of the high-voltage outlet cabinet is connected with a 10KV high-voltage power grid through a high-voltage cable II; the turbine power generation unit further comprises a speed measuring sensor, a pressure measuring sensor and a temperature measuring sensor which are connected with the control system; the control system is a PLC or DCS system and is connected with a first control circuit in the high-voltage asynchronous power generation grid-connected cabinet.
The high-voltage asynchronous power generation grid-connected cabinet comprises a high-voltage cabinet body, a grounding knife, a zero sequence transformer, a charge indicator, a high-voltage comprehensive protection device, a cabinet top PT small bus, a cabinet top control small bus, a current transformer, a high-voltage grid-connected circuit breaker, a high-voltage main bus bar and a first control circuit, wherein the first control circuit is used for controlling the switching-on and switching-off of the first high-voltage grid-connected circuit breaker; the high-voltage outlet cabinet comprises a high-voltage cabinet body, a high-voltage circuit breaker, a high-voltage main busbar, an overvoltage protector, a charged indicator, a high-voltage comprehensive protection device, a PT voltage transformer, a cabinet top PT small busbar, a current transformer, a control transformer, a UPS power supply and a cabinet top control small busbar control circuit II, wherein the control circuit II is used for performing switching-on and switching-off control on the high-voltage circuit breaker.
A control system, characterized by: when the turbine rotating speed is greater than 90% of the turbine rated rotating speed for more than 5S, the grid-connected automatic input signal is '1' for 1S, the RS trigger is triggered to be '1', and at the moment, if the turbine rotating speed is greater than 95% of the turbine rated rotating speed and less than 99% of the turbine rated rotating speed, the control system sends a switching-on signal 41 to be '1' for 1S, so that a first 18 switching-on circuit of the control circuit is switched on, and when the switching-on is completed, 2S is completed, namely, the switching-on state signal of the high-voltage asynchronous generation grid-connected cabinet is '1' for 2S or the grid-connected automatic switching-off signal is '1', and the RS trigger is reset to be '0'. The automatic input signal of the grid connection is an input signal in the control system 9; the operator selects to input a grid-connected automatic input signal, namely '1', and selects an automatic mode.
The invention adopts a form of not assembling a screen and is independently placed; forming an independent cabinet top PT signal by using a PT voltage transformer; and forming a cabinet top control busbar by using a control transformer. According to the invention, the grid connection speed condition is set by setting the automatic grid connection judgment logic of the high-voltage asynchronous power generation grid connection cabinet, so that the impact on the power grid in the grid connection process is reduced, and the power grid is automatically and quickly integrated. The invention has the following characteristics:
1. the high-voltage asynchronous power generation grid-connected cabinet is isolated from the 10KV high-voltage power grid through the high-voltage outlet cabinet, and the high-voltage asynchronous grid-connected cabinet can be maintained under the condition of 10KV uninterrupted power supply.
2. And forming an independent cabinet top PT small bus by using a PT voltage transformer.
3. And forming an independent cabinet top control busbar by using a control transformer.
4. The high-voltage asynchronous grid-connected cabinet circuit is interlocked with the high-voltage outlet cabinet circuit. Interlocking means: 1. the high-voltage circuit breaker of the high-voltage outlet cabinet is not switched on, and the high-voltage grid-connected circuit breaker of the high-voltage asynchronous grid-connected cabinet cannot be switched on; 2 tripping the high-voltage circuit breaker of the high-voltage outlet cabinet, and tripping the high-voltage grid-connected circuit breaker of the high-voltage asynchronous grid-connected cabinet at the same time.
5. The high-voltage asynchronous power generation grid-connected cabinet works and the high-voltage asynchronous motor reaches a set rotating speed condition to generate a motor starting command, so that the time for the high-voltage asynchronous motor to be integrated into a power grid is shortened, and the high-voltage asynchronous power generation grid-connected cabinet can enable the motor to be automatically friendly and integrated into the power grid without impact.
Compared with other methods, the method has the advantages of low requirements on motor rotation speed control, high adjustment margin, simpler operation, capability of limiting the time of starting current when being integrated into a power grid, almost no impact on the power grid, good economy and good single machine high-capacity adaptability.
Drawings
FIG. 1 is a block diagram of a turbine power generation high voltage asynchronous grid-connected device;
FIG. 2 is a schematic diagram of PT busbar formation;
FIG. 3 is a schematic diagram of a control power supply formation;
FIG. 4 is a schematic diagram of a closing allowing loop of the high-voltage asynchronous power generation grid-connected cabinet;
FIG. 5 is a schematic diagram of a switching-on and tripping circuit of the high-voltage asynchronous power generation grid-connected cabinet;
fig. 6 is a logic diagram of automatic grid connection judgment of the high-voltage asynchronous power generation grid connection cabinet.
Detailed Description
The technical solutions of the embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings, which are simplified schematic diagrams illustrating the basic structure of the present invention by way of illustration only.
In fig. 1: 1. a turbine power generation unit; 2. a turbine; 3. a speed reducer; 4. a high-voltage asynchronous motor; 5. a turbine intake valve; 6. a speed sensor; 7. a pressure sensor; 8. a temperature sensor; 9. a control system; 10. a first high-voltage cable; 11. a high-voltage asynchronous power generation grid-connected cabinet; 12. a high voltage grid-connected circuit breaker; 13. a first current transformer; 14. a grounding knife; 15. a zero sequence transformer; 16. an overvoltage protector I; 17. a first high-voltage charge indicator; 18. a first control circuit; 19. high-voltage comprehensive protection is carried out; 20. a high-voltage outlet cabinet; 21. a high voltage circuit breaker; 22. a second current transformer; 23. PT voltage transformer; 24. a cabinet top PT small bus; 25. a control transformer; 26. a UPS power supply; 27. the cabinet top controls the small bus; 28. a second control circuit; 29. high-pressure comprehensive protection II; 30. an overvoltage protector II; 31. a second high-voltage charge indicator; 32. a high-voltage main busbar; 33. a second high-voltage cable; 34. 10KV high-voltage power grid.
In fig. 2: the PT voltage transformer 23 takes 10KV voltage A, B, C of the second high-voltage cable 33 to reduce the three-phase voltage to 100V to form a cabinet top PT small bus 24, and the cabinet top PT small bus 24 is respectively connected with the first high-voltage comprehensive protection and the second high-voltage comprehensive protection to provide three-phase voltage signals.
In fig. 3, the control transformer 25 takes the 10KV voltage A, C of the second high-voltage cable 33 to be reduced to 220V, and is connected with the UPS power supply 26 to form a cabinet top control busbar 27, the cabinet top control busbar 27 is respectively connected with the first high-voltage comprehensive protection 19 and the second high-voltage comprehensive protection 29, and the first control circuit 18, the second control circuit 28 and the 220VAC control power supply are respectively provided.
In fig. 4: 35. a working position signal of the high-voltage asynchronous generation grid-connected cabinet; 36. and the high-voltage grid-connected circuit breaker stores energy signals.
37. A high-voltage outlet cabinet closing state signal; 38. a ground blade position signal; 39. a control system enable signal; 40. closing allows for an intermediate relay.
The first control circuit 18 of the high-voltage asynchronous generation grid-connected cabinet 11 is provided with a switching-on permission loop, and the switching-on permission loop comprises a 220VAC power supply provided by a cabinet top control small bus 27, a working position signal 35 of the high-voltage asynchronous generation grid-connected cabinet, an energy storage signal 36 of a high-voltage grid-connected breaker, a switching-on state signal 37 of a high-voltage outlet cabinet, a grounding knife position signal 38, a control system permission signal 39 and a switching-on permission intermediate relay 40. 35 is the position signal of the breaker of the high-voltage grid-connected cabinet, and an operator uses a rotary handle to shake the breaker into a working position; the energy storage signal 36 of the high-voltage grid-connected circuit breaker is an energy storage signal of the high-voltage grid-connected circuit breaker, namely the state of energy storage of a switching-on spring, and has the function of switching-on energy after the high-voltage grid-connected circuit breaker receives a switching-on instruction; 37 is a self-carried closing state signal of the high-voltage circuit breaker of the high-voltage outlet cabinet; 38 is a position signal of a grounding knife of the high-voltage asynchronous generation grid-connected cabinet; 39 is an enable signal in the closing loop from the control system. An operator uses a rotary handle to shake the high-voltage asynchronous generation grid-connected cabinet breaker into a working position and then closes the breaker 35; switching on a control power supply, working the energy storage motor of the circuit breaker of the high-voltage grid-connected cabinet, storing energy by a switching-on spring, and closing 36; the high voltage outlet cabinet circuit breaker is in the closed state, 37 is closed, and a signal is provided to the circuit Xu Gezha in fig. 4, i.e. the high voltage outlet cabinet is connected with the high voltage power network at this time.
In fig. 5: 41. the control system is used for switching on signals; 42. closing the auxiliary contact 43 of the intermediate relay and the closing coil of the high-voltage grid-connected circuit breaker; 44. controlling the system to trip the signal; 45. a high voltage comprehensive protection secondary tripping signal; 46. trip coil of high-voltage grid-connected breaker.
The first control circuit 18 of the high-voltage asynchronous power generation grid-connected cabinet 11 is provided with a switching-on circuit, and comprises a 220VAC power supply provided by a cabinet top control small bus 27, a control system switching-on signal 41, a high-voltage comprehensive protection one 19, a switching-on allowable intermediate relay auxiliary contact 42 and a high-voltage grid-connected circuit breaker switching-on coil 43, wherein when the control system switching-on signal 41 is in a signal switching-on state, the switching-on allowable intermediate relay auxiliary contact 42 is in a signal switching-on state, and the high-voltage comprehensive protection 19 does not have tripping signals, the switching-on action of the high-voltage grid-connected circuit breaker switching-on coil 43 is realized.
The first control circuit 18 of the high-voltage asynchronous generation grid-connected cabinet 11 is provided with a tripping circuit, and comprises a 220VAC power supply provided by a cabinet top control busbar 27, a control system tripping signal 44, a high-voltage comprehensive protection secondary tripping signal 45, a high-voltage comprehensive protection primary 19 and a high-voltage grid-connected circuit breaker tripping coil 46, wherein when the control system tripping signal 44 is in a signal closing state or the high-voltage comprehensive protection secondary tripping signal 45 is in a signal closing state or the high-voltage comprehensive protection primary 19 has a tripping signal, the tripping action of the high-voltage grid-connected circuit breaker tripping coil 46 is performed.
Fig. 6 is: the automatic grid-connected judging logic of the high-voltage asynchronous power generation grid-connected cabinet is characterized in that grid-connected rotating speed judging logic is arranged on the control system 9, when the rotating speed of a turbine is higher than 90% of the rated rotating speed of the turbine for more than 5 seconds, a grid-connected automatic input signal is '1' for more than 1 seconds, an RS trigger is triggered to be '1', the RS trigger is a part of the control system 9), at the moment, if the rotating speed of the turbine is higher than 95% of the rated rotating speed of the turbine and is lower than 99% of the rated rotating speed of the turbine, the control system 9 sends a control system to switch on a switching-on signal 41 to be '1' for more than 1 seconds, the control circuit is switched on by an 18 switching-on circuit, and when switching-on is completed, namely, a switching-on state signal of the high-voltage asynchronous power generation grid-connected cabinet is '1' for more than 2 seconds or a grid-connected automatic switching-off signal is '1', and the RS trigger is reset to '0'.
The using process comprises the following steps:
the high-voltage circuit breaker 21 is in a closing state by the second control circuit 28 of the high-voltage outlet cabinet 20.
The turbine power generation unit 1 is started by the control system 9, the turbine air inlet valve in the turbine power generation unit 1 is turned on to drive the speed reducer 3 to rotate so as to drag the high-voltage asynchronous motor 4 to rotate, the control system 9 collects data of the speed measuring sensor 6, the pressure measuring sensor 7 and the temperature measuring sensor 8, corresponding set values are arranged in the control system 9, and the set values are exceeded to trigger the interlocking signals.
When the speed sensor 6 collected by the control system 9 reaches a set value of the rotating speed of the control system, the control system 9 sends a starting signal of the high-voltage asynchronous motor 4 to the first control circuit 18 of the high-voltage asynchronous power generation grid-connected cabinet 11, the first control circuit 18 is switched on, the switching-on signal refers to the action of the switching-on coil 43 of the high-voltage grid-connected circuit breaker in fig. 5, the high-voltage grid-connected circuit breaker 12 is switched on, the high-voltage asynchronous motor is connected with the 10KV power grid, and the starting grid-connected process is completed.
Meanwhile, the high-voltage comprehensive protection one 19 collects voltage signals of the small PT bus 24 on the top of the cabinet, collects current signals of the current transformer one 13 and collects current signals of the zero-sequence current transformer 15, the high-voltage comprehensive protection one 19 judges whether overvoltage, low voltage, overcurrent, overload and zero-sequence overcurrent conditions exist, if yes, the high-voltage comprehensive protection one 19 sends protection tripping signals, and the high-voltage grid-connected circuit breaker 12 is disconnected and separated from a 10KV high-voltage power grid. The second high-voltage comprehensive protection 29 collects voltage signals of the small PT bus 24 on the top of the cabinet, collects current signals of the second current transformer 22, judges whether overvoltage, low-voltage and overcurrent conditions exist or not according to the second high-voltage comprehensive protection 29, and if yes, the first high-voltage comprehensive protection 19 sends a protection tripping signal to trip the high-voltage circuit breaker 21 and simultaneously sends a tripping signal to the first control circuit 18.
Claims (6)
1. A turbine power generation high-voltage asynchronous grid-connected method is characterized by comprising the following steps of:
control circuit II through high-voltage outlet cabinet (20) 28) putting the high-voltage circuit breaker (21) in a closed state;
the turbine air inlet valve (5) in the turbine power generation unit (1) is opened through the control system (9) to flush the turbine (2), the speed reducer (3) is driven to rotate so as to drag the high-voltage asynchronous motor (4) to rotate, the control system (9) collects data of the speed measuring sensor (6), the pressure measuring sensor (7) and the temperature measuring sensor (8), corresponding set values are arranged in the control system (9), an interlocking signal is triggered when the set values are exceeded, the turbine air inlet valve (5) is closed, and the high-voltage grid-connected circuit breaker (12) trips;
when a speed measuring sensor (6) collected by a control system (9) reaches a rotating speed set value of the control system, the control system (9) sends a starting signal of a high-voltage asynchronous motor (4) to a first control circuit (18) of a high-voltage asynchronous power generation grid-connected cabinet (11), the first control circuit (18) is switched on, a high-voltage grid-connected breaker (12) is switched on, the high-voltage asynchronous motor (4) is connected with a 10KV power grid, and a starting grid-connected process is completed; the high-voltage asynchronous power generation grid-connected cabinet is isolated from a 10KV power grid through a high-voltage outlet cabinet;
the high-voltage comprehensive protection one (19) collects voltage signals of a PT small bus (24) on the top of the cabinet, collects current signals of a first current transformer (13) and collects current signals of a zero-sequence current transformer (15), and the high-voltage comprehensive protection one (19) judges whether overvoltage, low voltage, overcurrent, overload and zero-sequence overcurrent conditions exist or not, and if a protection tripping signal exists, the high-voltage grid-connected circuit breaker (12) is tripped; the high-voltage comprehensive protection II (29) collects voltage signals of the PT small bus (24) on the top of the cabinet and current signals of the current transformer II (22), the high-voltage comprehensive protection II (29) judges whether overvoltage, low voltage and overcurrent conditions exist, if the overvoltage, low voltage and overcurrent conditions exist, the high-voltage circuit breaker (21) is tripped by a tripping signal, and meanwhile, the tripping signal is sent to a tripping circuit of the control circuit I (18) to trip the high-voltage grid-connected circuit breaker (12).
2. The turbine power generation high-voltage asynchronous grid-connection method according to claim 1, wherein: a first control circuit (18) of the high-voltage asynchronous generation grid-connected cabinet (11) is provided with a switching-on permission loop, and the switching-on permission loop comprises a 220VAC power supply provided by a cabinet top control busbar (27) and a working position signal (35) of the high-voltage asynchronous generation grid-connected cabinet, an energy storage signal (36) of a high-voltage grid-connected circuit breaker, a switching-on state signal (37) of a high-voltage outlet cabinet, a grounding knife position signal (38), a control system permission signal (39) and a switching-on permission intermediate relay (40) which are connected; when the working position signal (35) of the high-voltage asynchronous power generation grid-connected cabinet is in a working position, namely a signal closed state, the energy storage signal (36) of the high-voltage grid-connected circuit breaker is stored, namely a signal closed state, the closing state signal (37) of the high-voltage outlet cabinet is in a closing state, namely a signal closed state, the grounding knife position signal (38) is in a separating state, namely a signal closed state, the control system permission signal (39) is in a permission state, namely a signal closed state, and the closing permission intermediate relay (40) is in a power-on state;
the first control circuit (18) of the high-voltage asynchronous power generation grid-connected cabinet (11) is provided with a switching-on circuit, and comprises a 220VAC power supply provided by a cabinet top control busbar (27) and a control system switching-on signal (41), a high-voltage comprehensive protection switch (19), a switching-on allowable intermediate relay auxiliary contact (42) and a high-voltage grid-connected breaker switching-on coil (43) which are connected, wherein when the control system switching-on signal (41) is in a signal closing state, the switching-on allowable intermediate relay auxiliary contact (42) is in a signal closing state, the high-voltage comprehensive protection switch (19) has no tripping signal, and the high-voltage grid-connected breaker switching-on coil (43) performs switching-on action;
the high-voltage asynchronous power generation grid-connected cabinet (11) control circuit I (18) is provided with a tripping circuit, and comprises a 220VAC power supply provided by a cabinet top control busbar (27) and a tripping signal (44) of a control system, a high-voltage comprehensive protection II tripping signal (45), a high-voltage comprehensive protection I (19) and a tripping coil (46) of a high-voltage grid-connected circuit breaker, wherein when the tripping signal (44) of the control system is in a signal closed state or the tripping signal (45) of the high-voltage comprehensive protection II is in a signal closed state or the tripping signal (19) of the high-voltage comprehensive protection I is in a tripping action of the tripping coil (46) of the high-voltage grid-connected circuit breaker.
3. The turbine power generation high-voltage asynchronous grid-connection method according to claim 1, wherein: the PT voltage transformer (23) takes 10KV voltage A, B, C of the high-voltage cable II (33) to be reduced to 100V to form a cabinet top PT small bus (24), and the cabinet top PT small bus (24) is respectively connected with the high-voltage comprehensive protection I and the high-voltage comprehensive protection II to provide three-phase voltage signals;
the control transformer (25) takes the 10KV power grid voltage A, C of the high-voltage cable II (33) to be reduced to 220V, and is connected with the UPS power supply (26) to form a cabinet top control busbar (27), and the cabinet top control busbar (27) is respectively connected with the high-voltage comprehensive protection I (19), the high-voltage comprehensive protection II (29), the control circuit I (18) and the control circuit II (28) to provide 220VAC control power supply.
4. The utility model provides a turbine electricity generation high pressure asynchronization is incorporated into power networks device which characterized in that: the system comprises a high-voltage outlet cabinet, a high-voltage asynchronous power generation grid-connected cabinet, a turbine power generation unit, a control system, a high-voltage cable and a 10KV power grid;
the turbine power generation unit comprises a turbine expander (2), a turbine air inlet valve (5) is connected with an inlet of the turbine (2), a shaft work output end of the turbine is connected with a high-speed end of a speed reducer, a low-speed end of the speed reducer is connected with a high-voltage asynchronous motor, a power generation output of the high-voltage asynchronous motor is connected with a high-voltage asynchronous power generation grid-connected cabinet through a high-voltage cable and a grid-connected breaker input end, a grid-connected breaker output end of the high-voltage asynchronous power generation grid-connected cabinet is connected with a high-voltage breaker input end of a high-voltage outlet cabinet through a high-voltage busbar, and a high-voltage breaker output end of the high-voltage outlet cabinet is connected with a 10KV power grid through a high-voltage cable II (33);
the turbine power generation unit further comprises a speed measuring sensor, a pressure measuring sensor and a temperature measuring sensor which are connected with the control system;
the control system is a PLC or DCS system and is connected with a first control circuit (18) in the high-voltage asynchronous power generation grid-connected cabinet (11).
5. The turbine power generation high-voltage asynchronous grid-connected device according to claim 4, wherein: the high-voltage asynchronous power generation grid-connected cabinet (11) comprises a high-voltage cabinet body, a grounding knife, a zero sequence transformer, a charged indicator, a high-voltage comprehensive protection device, a cabinet top PT small bus, a cabinet top control small bus, a current transformer, a high-voltage grid-connected circuit breaker, a high-voltage main bus bar and a first control circuit (18), wherein the first control circuit (18) is used for controlling the switching-on and switching-off of the high-voltage grid-connected circuit breaker (12);
the high-voltage outlet cabinet comprises a high-voltage cabinet body, a high-voltage circuit breaker, a high-voltage main busbar, an overvoltage protector, a charged indicator and a high-voltage comprehensive protection device, a PT voltage transformer, a cabinet top PT small busbar, a current transformer, a control transformer, a UPS power supply and a cabinet top control small busbar control circuit II (28), wherein the control circuit II is used for performing switching-on and switching-off control on the high-voltage circuit breaker.
6. A control system, characterized by: when the turbine rotating speed is greater than 90% of the turbine rated rotating speed for more than 5S, the grid-connected automatic input signal is '1' for 1S, the RS trigger is triggered to be '1', and at the moment, if the turbine rotating speed is greater than 95% of the turbine rated rotating speed and less than 99% of the turbine rated rotating speed, the control system sends a switching-on signal 41 to be '1' for 1S, so that a first 18 switching-on circuit of the control circuit is switched on, and when the switching-on is completed, 2S is completed, namely, the switching-on state signal of the high-voltage asynchronous generation grid-connected cabinet is '1' for 2S or the grid-connected automatic switching-off signal is '1', and the RS trigger is reset to be '0'.
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