CN110401194A - A kind of fast cutting system of three power supply of Combined cycle gas-steam turbine distributed energy and method - Google Patents
A kind of fast cutting system of three power supply of Combined cycle gas-steam turbine distributed energy and method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
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Abstract
The present invention discloses a kind of fast cutting system of three power supply of Combined cycle gas-steam turbine distributed energy and method; including three units; every unit is respectively arranged with a high-voltage auxiliary bus and for providing the working power inlet wire of work incoming power; working power inlet wire is connected to main transformer low-pressure side through current-limiting reactor, and current-limiting reactor both ends are parallel with high speed current-limiting protection switch；It is connected respectively by different backup power source incoming switches between the high-voltage auxiliary bus of any two units, the connection between the high-voltage auxiliary bus between unit is controlled by the on-off of backup power source incoming switch；Make full use of Combined cycle gas-steam turbine distributed energy station-service electric load in interim distribution, the feature that unit number is more, capacity is small, working power is derived from main transformer low-pressure side, double spare power supply is derived from adjacent unit high-voltage auxiliary bus, it solves existing station service and cuts the problems such as investment in allocation plan is more, and land occupation is wide and generator rotor angle is big fastly.
Description
Technical field
The invention belongs to the electrical design fields in Combined cycle gas-steam turbine distributed energy power station, and in particular to a kind of combustion
The fast cutting system of three power supply of gas Steam Combined Cycle distributed energy and method.
Background technique
" large and medium-sized thermal power plant design specification " regulation: personal or important equipment safety will be directly influenced by having a power failure
Load, it is necessary to which the backup power source automatically engaged is set.The fast cutting system design of conventional station service, usual working power are derived from this TV station
The HV Auxiliary Transformer of unit, backup power source are derived from the starting spare transformer being separately provided, and auxiliary power change-over refers to
The switching to work between incoming switch and standby inlet switch.Three kinds of switching mode point: normal switching, improper switching and accident
Switching.The fast cutting system of this set needs to be separately provided HV Auxiliary Transformer, the spare change of starting and enclosed busbar.This system footprint
It is more；It invests larger；Working power and backup power source generator rotor angle are big, and normal switching can only select series connection switching mode；Backup power source
For external power supply, spend higher.A kind of foundation of Combined cycle gas-steam turbine cold, heat and power triple supply system is general in energy cascade utilization
On the basis of thought, integrate a kind of distributed energy resource system of refrigeration, heat supply (heating and supplying hot water) and power generation process, there is machine
The advantages that pool-size is small, takes up little area, number of units is more, flexible arrangement, high-efficient, is the main way of realization of China's distributed energy.
But the fast cutting system implementation of traditional station service is not able to satisfy the needs in distributed energy power station.
Summary of the invention
In order to solve the problems in the existing technology, the object of the present invention is to provide a kind of Combined cycle gas-steam turbines point
The fast cutting system of three power supply of the cloth energy and method make full use of Combined cycle gas-steam turbine distributed energy station-service electric load in rank
The distribution of section property, the feature that unit number is more, capacity is small, working power are derived from main transformer low-pressure side, and double spare power supply is derived from adjacent unit
High-voltage auxiliary bus solves existing station service and cuts the problems such as investment in allocation plan is more, and land occupation is wide and generator rotor angle is big fastly.
To achieve the goals above, the technical solution adopted by the present invention is that: a kind of Combined cycle gas-steam turbine distribution energy
The fast cutting system of three power supply of source, which is characterized in that including three units, every unit is respectively arranged with a high-voltage auxiliary bus and use
In providing the working power inlet wire of work incoming power, working power inlet wire is connected to main transformer low-pressure side through current-limiting reactor, limits
Stream reactor both ends are parallel with high speed current-limiting protection switch；Respectively by spare between the high-voltage auxiliary bus of any two units
Electric power incoming line switch connection controls the company between the high-voltage auxiliary bus between unit by the on-off of backup power source incoming switch
Connect situation；When the work incoming switch of a certain unit is in "on" position, high-voltage auxiliary bus and other two unit
Backup power source incoming switch between high-voltage auxiliary bus have one in quartile, and the standby electricity connected between other two unit
Source incoming switch is in quartile.
When systems are functioning properly, high speed current-limiting protection switch is in "on" position, and current-limiting reactor no current passes through, and becomes
Now to be lossless, no pressure drop does not generate magnetic flux leakage；When short trouble occurs for system, high speed current-limiting protection switch quick-speed turning on-off,
Current-limiting reactor is put into, achievees the effect that limiting short-circuit current.
Further, when the work incoming switch of a certain unit is in "on" position, high-voltage auxiliary bus in addition
Backup power source incoming switch between the high-voltage auxiliary bus of two units have one in quartile.
Further, a fast switching device is respectively arranged in each unit, in three units, for the height of some unit
For pressing auxiliary bus bar, the high-voltage auxiliary bus of other two unit is standby by fast switching device realization two as backup power source
With the setting of power supply priority.
Further, main transformer low-pressure side is to working power inlet wire using bus connection is poured, and backup power source inlet wire is using electricity
Cable connection, working power and backup power source come from the same substation, using the identical mode of connection.
Further, the high-pressure side of the current-limiting reactor be provided with for overhaul isolation disconnecting switch, any two
The backup power source incoming switch connected between the high-voltage auxiliary bus of unit is also in series with isolation switch.
The present invention also provides a kind of three power supply quick switch methods of Combined cycle gas-steam turbine distributed energy, including walk as follows
It is rapid:
Step 1) combines the power output comprehensive analysis of gas turbine start up curve and different phase auxiliary system to go out different phase
Station-service power load distributing situation, including the Combined cycle gas-steam turbine unit factory different with the unit on-load stage in the high disk of unit
Power load distribution situation；Make full use of the characteristics of Combined cycle gas-steam turbine unit station-service load is in interim distribution, selection
2) capacity of work incoming switch and standby inlet switch, enters step after determining；
The voltage that HV auxiliary power s ystem is arranged in step 2) is identical as generator voltage and main transformer low-pressure side voltage, enters after determining
Step 3)；
Reactor is arranged between main transformer low-pressure side and work inlet wire in step 3), enters step 4) after determining；
Double spare power transfer device is arranged in electric room in step 4), cuts closing circuit fastly in electric power incoming line switch
Middle setting latching logic prevents the three unit operations of same unit HV auxiliary power s ystem while load, enters step 5) after determining；
Step 5) double spare power supply fast switching device selects the priority of backup power source, realizes working power and backup power source one
Between two-way switching or working power and backup power source two between two-way switching, improve the secondary circuit of fast cutting system.
Further, the station-service total load for counting every set unit, for confirming the capacity of work incoming switch；It calculates different
Station-service maximum load under operating condition, for determining the capacity of standby inlet switch.
Further, in step 1) the station-service total load of every set unit be all high-tension motors and low pressure factory varying capacity it
With；Work incoming switch capacity is the requirement for different phase station-service load and there are the allowances for being not less than 10%.
Further, step 2) mesohigh station service work incoming power is derived from main transformer low-pressure side, and double spare power supply is derived from
The high-voltage auxiliary bus of adjacent unit.
Further, pass through the impedance of power system capacity, system impedance and main transformer in step 3), calculate main transformer low-pressure side short circuit
Electric current is calculated the short circuit current of main transformer low-pressure side using nodal method, determines current-limiting reactor according to main transformer low-pressure side short circuit current
Capacity.
Station service fast switching device mentioned in the present invention is worked as realizing auxiliary power change-over, fast switching device for judging
Preceding operating status, and according to different orders execute it is different cut operation fastly, the analog quantity that fast switching device acquires has work
The voltage of power supply, backup power source inlet wire and bus, the switch state of work incoming switch and standby inlet switch, working power
The electric current of inlet wire and backup power source inlet wire, these are used to judge the operating status of station service electrical system；It is opened for executing work inlet wire
It closes and the command drcuit of standby inlet switch breaking-closing operating, Fast Switch with Large Capacity FSR is known as high speed current-limiting protection switch,
Main function is before short circuit current does not rise to peak value, and by its high-speed breaking, Fast Switch with Large Capacity has switch off time
The features such as short, connecting-disconnecting function is strong, cheap.
Compared with prior art, the invention has the following beneficial technical effects: according to normal duty setting work into
Wiretap has biggish allowance to can satisfy the oepration at full load simultaneously of two sets of units, does not need that high factory's change and Qi Beibian is arranged,
It eliminates to open and is derived from problem where for variable power source, only increase reactor and large capacity switch, both reduce equipment investment,
Occupied area is saved again.
Further, station service all is from spontaneous electricity, has saved the price difference of outer power purchase and self-generated electricity.
Further, working power and backup power source come from the same substation, due to using the identical mode of connection, solution
Working power of having determined and the big problem of backup power source generator rotor angle.
Further, this system uses the fast butt formula of station service of double spare power supply, and is provided with special latching logic,
High reliablity, flexible operation.
Detailed description of the invention
Fig. 1 is in the prior art containing the fast cutting system schematic diagram of station service for opening standby change；
Fig. 2 is the station-service load chart under Combined cycle gas-steam turbine distributed energy unit different conditions；
Fig. 3 is the fast cutting system schematic diagram of three power supplys of the invention；
Fig. 4 is the fast cutting system circuit breaker lock logic chart of three power supplys of the invention；
Fig. 5 is the fast cutting system of three power supplys of the invention and method flow diagram.
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
As shown in Figure 1, needing to be arranged special high pressure factory in the fast cutting system of traditional station service and becoming offer work inlet wire electricity
Source is arranged special open and provides starting backup power source for change, and opening standby change high side power can be derived from and the same boosting of main transformer
It stands or is derived from special route.The usual equipment arrangement of Combined cycle gas-steam turbine distributed energy project is concentrated, and unit number is more,
Land occupation is few；For Combined cycle gas-steam turbine distributed energy project, there are deficiencies below for the fast cutting system of traditional station service:
Fast cutting system needs to be separately provided HV Auxiliary Transformer, the spare change of starting and enclosed busbar, no matter opens standby variable power source and is derived from this
Factory's booster stations or independent route, this system land occupation is more, invests larger；Working power and backup power source use different wiring
Mode, two power supply generator rotor angles are big, and normal switching can only select series connection switching mode, have of short duration power loss during auxiliary Power switching, no
Conducive to stable operation of unit；Backup power source is external power supply, is spent higher；And open standby variable power source and belong to outer power purchase, it is costly.
As shown in Fig. 2, the station-service load of typical Combined cycle gas-steam turbine distributed energy project is in interim distribution；
First load peak appears in height and makes an inventory during fire, during about 60% revolving speed；Another load peak appear in it is grid-connected after
During unit oepration at full load；The high load peak during fire of making an inventory is maximum.According to design specification, " large and medium-sized thermal power plant is set
Meter specification " GB 50660-2011 design work incoming switch capacity be consider all station-service loads requirement and there are
10% or more allowance, therefore the capacity of the switch can meet two unit station-service loads simultaneously.
As shown in figure 3, being one embodiment of the invention, work incoming switch is mounted on working power inlet wire, is connected to
Between high-voltage auxiliary bus and current-limiting reactor, in the present embodiment:
For No. 1 fast cutting system of unit station service: switch 9101 is work incoming switch, and 9100 be one inlet wire of backup power source
Switch, 9300 be two incoming switch of backup power source；
For No. 2 fast cutting systems of unit station service: switch 9201 is work incoming switch, and 9200 be one inlet wire of backup power source
Switch, 9100 be two incoming switch of backup power source；
For No. 3 fast cutting systems of unit station service: switch 9301 is work incoming switch, and 9300 be one inlet wire of backup power source
Switch, 9200 be two incoming switch of backup power source；
Wherein 9100G, 9200G and 9300G are isolation switch；9101G, 9201G and 9301G disconnecting switch.
The fast cutting system of three power supply of Combined cycle gas-steam turbine distributed energy, Voltage Classes of HV Electrical Auxiliary and generator go out
Mouth voltage and main transformer low-pressure side voltage are identical, and HV auxiliary power s ystem working power is derived from main transformer low-pressure side, and double spare power supply is derived from
Reactor is arranged for limiting short-circuit electricity in the high-voltage auxiliary bus of adjacent unit between main transformer low-pressure side and working power inlet wire
Stream.
As shown in figure 4, the station service of same unit while three units of band, work incoming switch and standby inlet switch
It is easy overload, in addition excessive station-service load contact is unfavorable for stable operation of unit；Therefore, it is provided with latching logic, is prevented
The station service of a certain unit while the station-service load of three units of band, in the present embodiment, the latching logic pass through DCS or hard
Wiring realizes, latching logic as shown in Figure 4, first set fast cutting system by fast switching device, 9101 switches, 9100 switches and
9300 switch constitute, fast switching device be used for be responsible for 9101 switches and 9100 switch between being switched fast or 9101 switch and
Handoff relation is not present between 9100 switches and 9300 switches in being switched fast between 9300 switches；Switch latching logic with the
For a set of:
The combined floodgate condition of 9101 switches are as follows: when 9100 switch separating brakes and 9300 switches close a floodgate；9300 switch separating brakes and 9100
Switch closes a floodgate；9100 switches and the 9300 equal separating brakes of switch, the setting of this latching logic effectively avoid 9100 switches and 9300 from opening
When Guan Jun closes a floodgate, fast switching device closes a floodgate to 9101 switches, causes the high-voltage Auxiliary system while three units of band of first set unit
House load operation.
The combined floodgate conditions of 9100 switches are as follows: 9200 and 9300 switches in gate-dividing state, because if 9200 switches and
Any one switch of 9300 switches reforms into the high-voltage Auxiliary system of first set unit simultaneously after 9100 switches close a floodgate in coincidence
House load operation with three units.
The combined floodgate condition of 9300 switches is such that 9100 and 9200 switches in gate-dividing state, because if 9100 open
It closes and reforms into the high-voltage Auxiliary system of first set unit after 9300 switches close a floodgate in coincidence with any one switch of 9200 switches
The House load operation of three units of band simultaneously.
In addition, the closing locking logic of the closing locking reference logic switch 9101 of switch 9201 and switch 9301.
The present invention takes full advantage of that Combined cycle gas-steam turbine distributed energy project unit capacity is small, and voltage is low, unit
The characteristics of number is more, and station-service load is in interim distribution.Working power and backup power source are taken respectively from main transformer low-pressure side and adjacent
Unit bus does not need setting and opens standby become and the change of high factory.
Specifically as shown in figure 5, a kind of fast cutting system of three power supply of Combined cycle gas-steam turbine distributed energy and method, real
Now include the following steps:
Step 1: counting the station-service total load (the sum of all high-tension motors and low pressure factory varying capacity) of every set unit, be used for
The capacity for confirming work incoming switch, passes through the power output comprehensive analysis to gas turbine start up curve and different phase auxiliary system
The station-service maximum load under different operating conditions is calculated, for determining the capacity of standby inlet switch, as shown in Fig. 2, through multiple
Gas-steam combined cycle power plant calculates and actual measurement, and maximum load appears in unit height and makes an inventory during fire.High disk load is that SFC is dragged
Dynamic combustion engine height makes an inventory fire to the station-service peak load of unit before set grid-connection, mainly includes SFC system loading, water system, oil system
The sub-load of system and waste heat boiler.Work becomes, water system becomes, complex building becomes 25% estimation according to capacity.SFC transformer is pressed
According to 90% estimation of capacity, excitation-transformation variable considers according to 30% power output.Height two water circulating pumps satisfactions of starting during fire of making an inventory are followed
The requirement of ring water.
Step 2: selection Voltage Classes of HV Electrical Auxiliary is identical with generator outlet.High-voltage Auxiliary working power is derived from main transformer
Low-pressure side, high-voltage Auxiliary backup power source one and power supply two are derived from the high-voltage auxiliary bus of adjacent unit.Main transformer low-pressure side extremely works
Electric power incoming line uses cable connection using bus connection, backup power source inlet wire is poured, and setting disconnecting switch is for overhauling isolation.
Step 3: by the impedance of power system capacity, system impedance and main transformer, main transformer low-pressure side short circuit current is calculated, according to this
Electric current determines that the capacity of reactor, reactor are used for limiting short-circuit current.
Step 4: for security reasons, not allowing the service power of three sets of units to be derived from same section of bus, therefore set
Special latching logic is counted, which can realize by DCS or hardwire.
Step 5: fast switching device selects the fast switching device of double spare power supply, and device can select standby electricity with a distant place or on the spot
After selection, normal switching, improper switching and the judging accident of work, backup power source may be implemented, two is spare in the priority in source
Handoff relation is not present between power supply.Improve the secondary circuit of fast cutting system.
In the present embodiment, which uses three sets of one-to-one Combined cycle gas-steam turbine units, realizes cold
Thermoelectricity trilogy supply is typical Combined cycle gas-steam turbine distributed energy project.Based on the considerations of economy and convenience, factory
It is 550 meters of the head of district, 80 meters wide, the design of the fast cutting system of station service is put forward new requirements.Gas electricity generator capacity is 51MW, electricity
Pressure is 10.5kV, and GCB is arranged in generator outlet.Based on the considerations of economy and practicability, the grade that HV auxiliary power s ystem is arranged is
10.5kV is identical as generator outlet voltage and main transformer low-pressure side voltage.According to station-service load statistical form, statistics obtains single set machine
Group station-service total load 11920kW selects work incoming switch, capacity 721A according to 10% allowance；It unites according to the above principle
Meter, peak load 7340kW select interconnection switches 9100 and 9300, capacity 444A according to 10% allowance.
As shown in figure 3, high-voltage Auxiliary working power is derived from main transformer low-pressure side, high-voltage Auxiliary backup power source one and power supply two are taken
From the high-voltage auxiliary bus of adjacent unit.Main transformer low-pressure side to working power inlet wire using pours bus connection, backup power source into
Line uses cable connection, and setting disconnecting switch is for overhauling isolation.
Setting reactor parallel connection large capacity, which switchs, between main transformer low-pressure side and work inlet wire is used for limiting short-circuit current.According to
On the basis of being 100MVA according to power system capacity, system impedance Z1=0.0349, Z2=0.0349, Z3=0.0508, main transformer capacity is
100000kVA, Ud=13.88% calculate the short circuit current of main transformer low-pressure side using nodal method, according to " power engineering is electrically set
Count handbook: electrical primary part " selection reactor model, select reactor for 0.303 Ω, reactance Rate 5%.Full factory's setting
Three sets of fast switching devices, every set fast switching device realize the auxiliary Power switching of this TV station unit.
Every set system is made of working power, backup power source one and backup power source two.One is arranged on every set fast switching device
Conversion handle is used to select the priority of backup power source, can also select backup power source in the priority of DCS selection backup power source
One is two-way switching between working power and backup power source one when being main, and backup power source two is selected to refer to working power and spare
Two-way switching between power supply two, backup power source one and backup power source two do not have handoff relation.As shown in figure 3, in figure most
No. 1 unit in left side, working power are derived from 1 main transformer low-pressure side, and backup power source one is No. 2 unit high voltage bus section bus, that is, 10kV
II sections, backup power source two be No. 3 unit high voltage bus section bus, that is, III sections of 10kV, first set fast switching device by switch 9101,
9100 and 9300 compositions, busbar voltage are derived from voltage transformer 91PT, and work primary voltage is derived from voltage transformer 9101PT, standby
The voltage transformer 92PT of II sections of buses of 10kV connection is derived from one voltage of inlet wire, spare two voltage of inlet wire is derived from 10kV III
The voltage transformer 93PT of section bus connection；
When it is main for selecting backup power source one, refer to the switching between switch 9101 and 9100；
When it is main for selecting backup power source two, refer to the switching between switch 9101 and 9300.
By taking above-mentioned distribution Combined cycle gas-steam turbine distributed energy project as an example, the station service designed using this method is fast
Cutting system saves full factory and saves three Tai Gao factories change expense (about 720,000 yuan of separate unit 12500KVA transformer) altogether, saves one
Platform opens standby change expense (about 1,050,000 yuan of separate unit 25000KVA transformer), an interval 110kV GIS (400,000), and increase expense is
Three sets of reactors and large capacity switch (20,000+large capacity of reactor switch 200,000), it is total to save money about 2,950,000.In addition it saves
Liao Santaigao factory becomes, opens the construction land at standby change and an interval GIS, effectively alleviates the situation of soil anxiety.Station service
It all is from spontaneous electricity, has saved the price difference of outer power purchase and self-generated electricity.Working power and backup power source come from the same power transformation
It stands, due to using the identical mode of connection, solves the problems, such as that working power and backup power source generator rotor angle are big.Further, this system
Using the fast butt formula of the station service of double spare power supply, and be provided with special latching logic, improve station service reliability and
The flexibility of operation.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification to the above embodiments, change and equivalent structural changes, still fall within skill of the present invention
In the protection scope of art scheme.
Claims (10)
1. a kind of fast cutting system of three power supply of Combined cycle gas-steam turbine distributed energy, which is characterized in that including three units, often
Platform unit is respectively arranged with a high-voltage auxiliary bus and for providing the working power inlet wire of work incoming power, working power into
Line is connected to main transformer low-pressure side through current-limiting reactor, and current-limiting reactor both ends are parallel with high speed current-limiting protection switch；Any two
It is connected respectively by backup power source incoming switch between the high-voltage auxiliary bus of unit, passes through the on-off of backup power source incoming switch
Control the connection between the high-voltage auxiliary bus between unit.
2. a kind of fast cutting system of three power supply of Combined cycle gas-steam turbine distributed energy according to claim 1, feature
It is, when the work incoming switch of a certain unit is in "on" position, the height of high-voltage auxiliary bus and other two unit
Pressure auxiliary bus bar between backup power source incoming switch have one in quartile.
3. a kind of fast cutting system of three power supply of Combined cycle gas-steam turbine distributed energy according to claim 1, feature
Be, be respectively arranged with a fast switching device in each unit, in three units, for some unit high-voltage auxiliary bus and
Speech, the high-voltage auxiliary bus of other two unit realize two backup power source priority by fast switching device as backup power source
Setting.
4. a kind of fast cutting system of three power supply of Combined cycle gas-steam turbine distributed energy according to claim 1, feature
It is, main transformer low-pressure side to working power inlet wire uses cable connection, work electricity using bus connection, backup power source inlet wire is poured
Source and backup power source come from the same substation, using the identical mode of connection.
5. a kind of fast cutting system of three power supply of Combined cycle gas-steam turbine distributed energy according to claim 1, feature
It is, the high-pressure side of the current-limiting reactor is provided with the disconnecting switch for overhauling isolation, the high pressure factory of any two units
Isolation switch is also in series with the backup power source incoming switch connected between bus.
6. a kind of three power supply quick switch method of Combined cycle gas-steam turbine distributed energy, which comprises the steps of:
Step 1) goes out the factory of different phase in conjunction with the power output comprehensive analysis of gas turbine start up curve and different phase auxiliary system
With power load distributing situation, including the Combined cycle gas-steam turbine unit station service different with the unit on-load stage in the high disk of unit
Power load distributing situation；The characteristics of Combined cycle gas-steam turbine unit station-service load is in interim distribution is made full use of, work is selected
2) capacity of incoming switch and standby inlet switch enters step after determining；
The voltage that HV auxiliary power s ystem is arranged in step 2) is identical as generator voltage and main transformer low-pressure side voltage, enters step after determining
3)；
Reactor is arranged between main transformer low-pressure side and work inlet wire in step 3), enters step 4) after determining；
Double spare power transfer device is arranged in electric room in step 4), sets in cutting in closing circuit fastly for electric power incoming line switch
Latching logic is set, the three unit operations of same unit HV auxiliary power s ystem while load is prevented, is entered step 5) after determining；
Step 5) double spare power supply fast switching device selects the priority of backup power source, realizes between working power and backup power source one
Two-way switching or working power and backup power source two between two-way switching, improve the secondary circuit of fast cutting system.
7. three power supply quick switch method of a kind of Combined cycle gas-steam turbine distributed energy according to claim 6, feature
It is, the station-service total load of every set unit is counted, for confirming the capacity of work incoming switch；It calculates under different operating conditions
Station-service maximum load, for determining the capacity of standby inlet switch.
8. three power supply quick switch method of a kind of Combined cycle gas-steam turbine distributed energy according to claim 6, feature
It is, the station-service total load of every set unit is the sum of all high-tension motors and low pressure factory varying capacity in step 1)；Work inlet wire
Contact capacity is the requirement for different phase station-service load and there are the allowances for being not less than 10%.
9. three power supply quick switch method of a kind of Combined cycle gas-steam turbine distributed energy according to claim 6, feature
It is, step 2) mesohigh station service work incoming power is derived from main transformer low-pressure side, and double spare power supply is derived from the height of adjacent unit
Press auxiliary bus bar.
10. three power supply quick switch method of a kind of Combined cycle gas-steam turbine distributed energy according to claim 6, feature
It is, passes through the impedance of power system capacity, system impedance and main transformer in step 3), main transformer low-pressure side short circuit current is calculated, using section
Point method calculates the short circuit current of main transformer low-pressure side, and the capacity of current-limiting reactor is determined according to main transformer low-pressure side short circuit current.
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