CN105186555B - Switch, digital and analog mixed island signal delivery method - Google Patents
Switch, digital and analog mixed island signal delivery method Download PDFInfo
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- CN105186555B CN105186555B CN201510505125.4A CN201510505125A CN105186555B CN 105186555 B CN105186555 B CN 105186555B CN 201510505125 A CN201510505125 A CN 201510505125A CN 105186555 B CN105186555 B CN 105186555B
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Abstract
The invention provides a switch, digital and analog mixed island signal delivery method. The method comprises the steps that island state and network operation signals which are determined by a converter station island discriminating device are delivered to a converter station secure device through a cable in a switch manner; the converter station secure device receives the signals, and determined island state, network operation and direct current outage signals are delivered to a power station secure device through an optical fiber in a digital manner; the power station secure device converts the received digital signals into switch signals, and delivers the switch signals to a power station island information delivery device through the cable; and the digital signals received by the power station island information delivery device are delivered in two manners. A power station island actuator converts the received digital signals into switch signals, and delivers the switch signals to a power station unit excitation regulator and a unit speed governor through the cable. A power station switch station monitoring system converts the received switch signals into digital signals, and delivers the digital signals to a power station monitoring host computer through the optical fiber. According to the invention, the island signals are delivered to the speed governor and excitation, monitoring and other systems; quick response is realized; and safe and stable operation of each system is ensured.
Description
Technical field
A kind of switching value of the present invention, digital quantity and analog quantity mixed type isolated island signal transfer method, are related to current conversion station and send out
Monitoring power station field.
Background technology
The direct access area bulk power grid operation of generator or power station, referred to as networking operation mode.The now regional power grid
Frequency and voltage it is relatively stable, unit load is easy to adjust, and scheduling is flexible.But alternating-current switch rupturing capacity, protected mode,
Stable Measures program is complicated.Generator or power station are not directly accessed main electrical network, but access an area load operation, referred to as
For decoupled mode, this is decoupled mode generalized definition.Decoupled mode described in direct current transportation, only refers to generator
The method of operation or power station is directly accessed current conversion station, with local main grid disconnection.Decoupled mode reduces small stream Lip river and crosses direct current
Impact to bulk power grid safety, reduces influencing each other for AC and DC system, it is to avoid straight-flow system and Northeastern Yunnan large electric power plant
The sub-synchronous oscillation problem of unit, effectively improves cloud electricity ability to send outside.But it is relatively weak that decoupled mode faces system, directly
Stream failure brings stablizing for system, and transformer unit speed regulator, the stable etc. of excitation are all huge challenges.How phase is transmitted more quickly
The information of pass is most important for problem above is solved.
Isolated island device is mainly made up of isolated island signal identification device and isolated island apparatus for transmitting signal.Isolated island signal identification device
Mainly by current conversion station isolated island discriminating gear and power station isolated island discriminating gear.Power station isolated island discriminating gear collection power station switch operation shape
State signal, is island state or networking state to help current conversion station isolated island discriminating gear to confirm.Isolated island apparatus for transmitting signal master
To be made up of power station isolated island information transfer device and power station isolated island performs device, while being related to stability control equipment and monitoring system etc..
Stability control equipment refers to that the emergent control measure such as machine, cutting load is cut in execution, is carried when electrical network is subject to large disturbances and the state of emergency occurs
High safe stability of power system, take precautions against stabilization of power grids accident, prevent large area blackout, be maintain power system peace
The complete stable and requisite 2nd road defence line of reliability service.Stability control equipment receives the orphan that current conversion station isolated island discriminating gear is sent
After island state or networking operation signal, carry out that corresponding strategy switching is carried out after judgement confirmation simultaneously, and judge whether direct current stops
Fortune signal.Isolated island signal includes that island state, networking operation and direct current are stopped transport.Isolated island signal is delivered to electricity through stability control equipment
Stand after layer, need many systems in power station to transmit, each system will make corresponding reaction.Main system is the monitoring in power station
System, speed regulator system and excitation system.The monitoring system in power station is by the data acquisition to the major-minor equipment in power station and concentrates prison
Control, realizes the automation of power station production run process and full factory's optimal control function, it is ensured that equipment safety reliability service.Monitoring system
System needs the signal that island state, networking operation and direct current are stopped transport.When island state and networking operation switch, due to system shape
State change is very fast, and frequency and voltage pulsation are larger, and monitoring system AGC and AVC are out of service.When islet operation and direct current stoppage in transit
When, the active closed loop of power station unit, Reactance Closed Loop are exited.Meanwhile, monitoring system needs the related alarm signal of transmission and reality
When signal.
The generating unit speed that power station governing system causes according to load variations（Frequency）Change, adjust into the hydraulic turbine stream
Amount（That is water energy）, change the active power of generator output（That is electric energy）, the requirement of load variations is adapted to, generated electricity at any time with reaching
With the power balance of electricity consumption, it is ensured that supply, electricity consumption frequency and its deviation are less than tolerance, maintain generating unit speed（Frequency）In volume
Determine in the prescribed limit of rotating speed.Governing system needs the signal that island state, networking operation and direct current are stopped transport.When speed regulator is received
To after island state signal, primary frequency modulation dead band switches to ± 0.15Hz by the ± 0.05Hz for networking；Frequency set-point no longer with
On the basis of busbar voltage frequency, but remain 50Hz；The pid parameter of power adjustment is switched to and is adapted under island state
Parameter.Direct current is stopped transport during islet operation, and when detecting frequency and increasing to over threshold value, is instantaneously reduced to zero load by aperture is given
Aperture, fast cutback.
Power station excitation regulator system is the voltage for maintaining generator or other control points in given level, control and through transport
The reasonable distribution of row unit reactive power, improves the stability of power system.Excitation system need island state, networking operation and
The signal that direct current is stopped transport.Field regulator is received after islet operation and direct current stoppage in transit signal, PSS is automatically exited from, in order to prevent
Voltage, after the set-point of set end voltage is reduced to into 0.95, quick regulation voltage.
In islet operation and after direct current stoppage in transit, power station will get rid of big load.When big load is got rid of in power station, for power station and electrical network
Stability is all a very acid test.Active and frequency how is rapidly adjusted especially for the speed regulator of unit, is encouraged
How magnestat rapidly adjusts idle and voltage, most important for stablizing for unit.If believed according to conventional isolated island
Number transfer mode：It is stable to receive after signal, the host computer of monitoring is passed to, unit monitoring system is then passed to, finally reach
The speed regulator and field regulator of unit.If using such transfer mode, the problems such as due to monitoring the sampling period, call duration time
Up to the 2-3 seconds, it is impossible to the safe and stable operation of power station equipment when meeting islet operation.
The content of the invention
The present invention provides a kind of switching value, digital quantity and analog quantity mixed type isolated island signal transfer method, and the method passes through
Optimized bang path and most quick signal transmission mode, be to speed regulator, excitation, monitoring etc. by isolated island signal transmission
System, so that it carries out quick response, it is ensured that the safe and stable operation of each system.
The technical solution adopted in the present invention is：
A kind of switching value, digital quantity and analog quantity mixed type isolated island signal transfer method, comprise the following steps：
Step 1：Island state, the networking operation signal that current conversion station isolated island discriminating gear is judged is by cable with switching value
Mode pass to current conversion station stability control equipment；
Step 2：Current conversion station stability control equipment receives signal, and the island state, networking operation, direct current after being judged is stopped transport
Signal passes to power station stability control equipment by way of optical fiber is with digital quantity；
Step 3：The data signal of reception is converted into on-off model by power station stability control equipment, and by cable power station is passed to
Isolated island information transfer device；
Step 4：The data signal that power station isolated island information transfer device is received, by two kinds of transfer modes：It is a kind of to speed
The signal having high demands directly passes to power station isolated island performs device by way of optical fiber is with data signal；Another kind passes through cable
Power station switchyard monitoring system is passed in the way of switching value；
Step 5：The data signal of reception is converted into on-off model by power station isolated island performs device, is passed to by cable
Power station unit field regulator and machine unit speed regulating device.
Step 6：DCgenerator motor field adjuster and machine unit speed regulating device receive unlike signal and carry out respective handling：Receive isolated island
State and direct current stoppage in transit signal, the rapid voltage and frequency for adjusting unit, keep set steady；Receive island state or networking
Signal, carries out corresponding regulation parameter switching；
Step 7：The on-off model of reception is converted into data signal by power station switchyard monitoring system, is transmitted by optical fiber
Give monitoring power station host computer；
Step 8：While the signal of reception is forwarded to power station unit monitoring by monitoring power station host computer, is reported to the police, drawn
Face shows, AVC is adjusted and AGC is adjusted etc..
Step 9：The signal of reception is converted into analog quantity by power station unit monitoring, is acted on DCgenerator motor field by cable and is adjusted
Device and speed regulator, realize that AVC is adjusted and AGC is adjusted.
A kind of switching value of the present invention, digital quantity and analog quantity mixed type isolated island signal transfer method, the transmission method has
Advantages below：
1）：The transfer mode of isolated island signal flexibly, i.e., realizes precise control using digital communication, and using hard contact side
Formula has avoided communication disruption problem, finally also carries out accurate adjustment to AGC, AVC using analog quantity.
2）：The transfer mode of isolated island signal is optimum and is easily achieved, and is mainly realized by modal cable and optical fiber.
3）：While the transfer mode satisfaction of isolated island signal is required, engineering cost is saved, isolated island signal utilizes stability control equipment
Optical-fibre channel, saves the optical fiber of two 4 90km of covering device.
4）：The passing time of isolated island signal is short, and only the field regulator and speed regulator of 500ms or so generating sets just can be with
Isolated island signal is received, can react rapidly to meet the safe and stable operation of unit and power system.
Description of the drawings
Fig. 1 is the signal transmission schematic diagram of the embodiment of the present invention 1.
Specific embodiment
Embodiment 1：
A kind of switching value, digital quantity and analog quantity mixed type isolated island signal transfer method, the method is by a certain current conversion station
The signal that isolated island discriminating gear is judged, current conversion station and certain power station using optimum transmission method, as shown in figure 1, including with
Lower step：
Step 1：Island state, the networking operation signal that current conversion station isolated island discriminating gear is judged is by cable with switching value
Mode pass to current conversion station stability control equipment.Current conversion station isolated island discriminating gear is main frame, and power station isolated island discriminating gear is slave.
The switch operation shape that current conversion station isolated island discriminating gear is mainly provided using itself collection and power station isolated island discriminating gear
State signal, judges that power station is island state or networking operation.Current conversion station isolated island discriminating gear is pacified with current conversion station stability control equipment
Same equipment room is mounted in, short distance is through cable connection.Current conversion station isolated island discriminating gear judges island state or networking operation
Signal driving means output node, in the way of the amount of opening the light pass to current conversion station stability control equipment by cable.
Step 2：Current conversion station stability control equipment receives signal, and the island state, networking signals, direct current after being judged is stopped transport
Signal passes to power station stability control equipment by way of optical fiber is with digital quantity.
Current conversion station stability control equipment and power station stability control equipment constitute the stable system of electrical network, primarily serve the purpose of when electrical network is disturbed greatly
When dynamic, the emergent control measure such as machine, cutting load is cut in execution, is improved safe stability of power system, is prevented large-area power-cuts
Accident, is to maintain the requisite 2nd road defence line of power system safety and stability.Current conversion station stability control equipment receives current conversion station isolated island
After island state that discriminating gear is sent or networking operation signal, carry out carrying out corresponding strategy after judgement confirmation switching simultaneously, and
Judge whether direct current stops transport signal.Isolated island signal includes：Island state, networking operation and direct current are stopped transport.The stable dress of current conversion station
Put and isolated island signal is converted into into digital quantity power station stability control equipment is passed to by the optical fiber of 90km.
Step 3：The data signal of reception is converted into on-off model by power station stability control equipment, and by cable power station is passed to
Isolated island information transfer device.
Step 4：The data signal that power station isolated island information transfer device is received, by two kinds of transfer modes：It is a kind of to speed
The signal having high demands directly passes to power station isolated island performs device by way of optical fiber is with data signal；Another kind passes through cable
Power station switchyard monitoring system is passed in the way of switching value.
Power station isolated island information transfer device, Main Function is that the isolated island signal transmission for receiving current conversion station gives power station related system
" intermediary " device.Isolated island signal includes that island state, networking operation and direct current are stopped transport.It is straight when occurring under island operation state
When stream is stopped transport, power station will get rid of big load voltage and frequency fluctuation is big, face power station unit and lose stable risk.At this moment signal is passed
That what is passed is faster, and field regulator and speed regulator carry out adjusting faster accordingly, and it is less that unit loses stable risk.9 units
Field regulator and speed regulator are remote with power station isolated island information transfer device distance, need through power station isolated island performs device transfer.
Power station isolated island information transfer device is remote with power station isolated island performs device distance, is connected using optical fiber.Power station isolated island information transmission dress
Put and receive isolated island signal, the signal high for rate request directly passes to power station isolated island by way of optical fiber is with data signal
Performs device, after pass to DCgenerator motor field adjuster and speed regulator.Power station isolated island information transfer device is pacified with switchyard monitoring system
Same equipment room is mounted in, short distance is through cable connection.Relatively low to rate request passes to power station switchyard through cable
Monitoring system.
Step 5：The data signal of reception is converted into on-off model by power station isolated island performs device, is passed to by cable
Power station 10-18 DCgenerator motor fields adjuster and 10-18 machine unit speed regulating devices.
Power station isolated island performs device, Main Function is that isolated island signal is directly passed to into field regulator and speed regulator etc. to hold
Luggage is put.Power station isolated island performs device is arranged in the middle of 9 units, with 10-18 DCgenerator motor fields adjuster and speed regulator distance
It is not far, by cable connection.The isolated island signal that power station isolated island performs device will be received, by cable the machine of power station 9 numbers is passed to
Group field regulator and speed regulator.
Step 6：DCgenerator motor field adjuster and speed regulator receive unlike signal and carry out respective handling：Receive island state
And direct current stoppage in transit signal, the rapid voltage and frequency for adjusting unit, keep set steady；Receive island state or networking letter
Number, carry out corresponding regulation parameter switching.
DCgenerator motor field adjuster is to maintain generator voltage in given level, and maintenance voltage is stable.Field regulator is received
After islet operation and direct current stoppage in transit signal, PSS is automatically exited from, after the set-point of set end voltage is reduced to into 0.95, quick regulation electricity
Pressure.The rotating speed that machine unit speed regulating device causes according to load（Frequency）Change, adjust the hydraulic turbine flow, maintain generating unit speed in volume
Determine in the prescribed limit of rotating speed.After speed regulator receives island state signal, primary frequency modulation dead band is by ± the 0.05Hz for networking
Switch to ± 0.15Hz；Frequency set-point remains 50Hz no longer on the basis of busbar voltage frequency；Receive orphan
Island state and direct current stoppage in transit signal, aperture is instantaneously given be reduced to no-load opening, fast cutback.
Step 7：The on-off model of reception is converted into data signal by power station switchyard monitoring, and by optical fiber electricity is passed to
Stand and monitor host computer；
Step 8：While the signal of reception is forwarded to power station 10-18 unit monitoring by monitoring power station host computer, carry out
Warning, picture show, AVC is adjusted and AGC is adjusted etc..
Power station 10-18 unit monitoring Main Functions are to unit real-time data acquisition, monitoring and control.On monitoring power station
Position machine monitors distant with 10-18 units, is connected by optical fiber.
Step 9：The signal of reception is converted into analog quantity by power station 10-18 unit monitoring, and by cable unit is acted on
Field regulator and speed regulator, realize that AVC is adjusted and AGC is adjusted.
In step 3-9, isolated island signal includes that island state, networking operation and direct current are stopped transport.In these steps, power station is stable
Device is only forwarding capability after on-off model to data signal simple conversion.Power station stability control equipment and power station isolated island information are passed
Delivery device is arranged on same equipment room, and short distance is through cable connection.Isolated island signal passes to power station isolated island information through cable
Transfer device.
Step 7-9 is relatively low to rate request（Second level）Signal transmission mode.Due to follow-up isolated island signal transacting master
If warning, picture show, AVC is adjusted and AGC is adjusted etc., the stability problem of unit is not related to, rate request can not had
Have so high.The equipment at power station switchyard monitoring Real-time Collection, monitoring and controlling switch station, monitoring power station host computer is to full power station
Equipment carries out real-time data acquisition, monitoring and controls.Power station switchyard monitoring is distant with monitoring power station host computer, by light
Fibre connection.
AVC（Automatism voltage control Automatic Voltage Control）, monitoring system is by each node electricity of collection
Pressure is analyzed and calculates, and carries out on-Line Voltage Reactive power control, to realize that generator reactive is exerted oneself optimum, rate of qualified voltage
Highest.
AGC（Automatic Generation Control Automatic Generation Control）Monitoring system specifies in generating set
Exert oneself in adjusting range, the instruction that issues of power scheduling is tracked, according to certain regulations speed real-time adjustment generated output, with full
Sufficient power system frequency and dominant eigenvalues control are required.The signal that power station 10-18 unit monitoring is received is converted into 4-20mA
Analog quantity, in island state or networking operation, DCgenerator motor field adjuster and speed regulator are realized AVC adjust and AGC adjust.
The transfer mode of isolated island signal of the present invention flexibly, i.e., realizes precise control using digital communication, adopts again and connects firmly
Point mode has avoided communication disruption problem.Meanwhile, to adopt in this way, call duration time is short, only 600ms or so 10-18 units
Field regulator and speed regulator can just receive isolated island signal, can react rapidly to meet the peace of unit and power system
Full stable operation.
Claims (1)
1. a kind of switching value, digital quantity and analog quantity mixed type isolated island signal transfer method, it is characterised in that comprise the following steps：
Step 1：Island state, the networking operation signal that current conversion station isolated island discriminating gear is judged is by cable with the side of on-off model
Formula passes to current conversion station stability control equipment；
Step 2：Current conversion station stability control equipment receives signal, the island state, networking operation, direct current stoppage in transit signal after being judged
Power station stability control equipment is passed to by way of optical fiber is with digital quantity signal；
Step 3：The digital quantity signal of reception is converted into on-off model by power station stability control equipment, passes to power station by cable lonely
Island information transfer device；
Step 4：The digital quantity signal that power station isolated island information transfer device is received, by two kinds of transfer modes：One kind is to directly joining
The signal adjusted with unit voltage-regulation and frequency directly passes to power station isolated island by way of optical fiber is with digital quantity signal and holds
Luggage is put；Another kind passes to power station switchyard monitoring system by way of cable is with on-off model；
Step 5：The digital quantity signal of reception is converted into on-off model by power station isolated island performs device, and by cable electricity is passed to
Stand DCgenerator motor field adjuster and machine unit speed regulating device；
Step 6：DCgenerator motor field adjuster and machine unit speed regulating device receive unlike signal and carry out respective handling：Receive island state
And direct current stoppage in transit signal, the rapid voltage and frequency for adjusting unit, keep set steady；Receive island state or networking letter
Number, carry out corresponding regulation parameter switching；
Step 7：The on-off model of reception is converted into digital quantity signal by power station switchyard monitoring system, is passed to by optical fiber
Monitoring power station host computer；
Step 8：While the digital quantity signal of reception is forwarded to power station unit monitoring by monitoring power station host computer, reported to the police,
Picture shows, AVC is adjusted and AGC is adjusted；
Step 9：Power station unit monitoring the signal of reception is converted into into analog quantity, by cable act on DCgenerator motor field adjuster and
Speed regulator, realizes that AVC is adjusted and AGC is adjusted.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510505125.4A CN105186555B (en) | 2015-08-18 | 2015-08-18 | Switch, digital and analog mixed island signal delivery method |
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| CN201510505125.4A CN105186555B (en) | 2015-08-18 | 2015-08-18 | Switch, digital and analog mixed island signal delivery method |
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| CN105186555A CN105186555A (en) | 2015-12-23 |
| CN105186555B true CN105186555B (en) | 2017-05-10 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109995055A (en) * | 2019-04-26 | 2019-07-09 | 中国长江电力股份有限公司 | A kind of unit real power control method of anti-power grid " direct current stoppage in transit " signal jitter |
| CN110729753A (en) * | 2019-07-03 | 2020-01-24 | 中国南方电网有限责任公司 | Unit frequency and voltage control method suitable for high-voltage direct current sending end island operation |
| CN111463817B (en) * | 2020-04-07 | 2023-05-09 | 中国南方电网有限责任公司 | Interface of dual stability control and island discrimination system and information processing system and method |
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| CN102332709A (en) * | 2011-09-13 | 2012-01-25 | 中国电力科学研究院 | Equivalent high-voltage direct-current transmission direct-current protection digital simulation method and system |
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| CN102332709A (en) * | 2011-09-13 | 2012-01-25 | 中国电力科学研究院 | Equivalent high-voltage direct-current transmission direct-current protection digital simulation method and system |
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