CN109510227A - Converter station bus steady state voltage determines method and apparatus after a kind of locking of direct current - Google Patents
Converter station bus steady state voltage determines method and apparatus after a kind of locking of direct current Download PDFInfo
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- CN109510227A CN109510227A CN201811087052.1A CN201811087052A CN109510227A CN 109510227 A CN109510227 A CN 109510227A CN 201811087052 A CN201811087052 A CN 201811087052A CN 109510227 A CN109510227 A CN 109510227A
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
Converter station bus steady state voltage determines method and apparatus after the present invention provides a kind of locking of direct current, after direct current, which is latched, to be occurred, calculates converter station and exchanges idle amount with AC system；Judge that converter station exchanges whether idle amount meets predetermined reactive power exchange dead zone section with AC system, when being unsatisfactory for reactive power exchange dead zone section, exchanges idle amount with AC system by putting into or cutting off alternating current filter adjustment converter station；Idle amount, which is exchanged, with AC system based on converter station determines converter station bus steady state voltage；The reactive power exchange dead zone section of converter station is determined based on the reactive power exchange reference value of converter station.This method considers alternating current filter action situation in converter station, is consistent with actual conditions, calculates gained converter station bus steady state voltage and actual deviation is smaller, accuracy is high.
Description
Technical field
The present invention relates to power system automatic fields, and in particular to converter station bus steady state voltage after a kind of locking of direct current
Determine method and apparatus.
Background technique
The concentration of extra-high voltage alternating current-direct current power transmission engineering is gone into operation so that great change occurs for power grid pattern and operation characteristic.Direct current
Locking failure is the most common failure form of direct current system, and direct current locking is in addition to sending receiving end electric network active frequency to generate impact
Outside, also converter station steady state voltage will be caused to significantly change, may cause direct current sending end new energy plant stand high pressure off-grid or direct current by
Collapse of voltage electric grid large area power cut is held, direct current is latched single failure and there is the possibility that development is cascading failure.Therefore scheduling fortune
It is necessary to accurately analyze converter station bus steady state voltage situation of change after direct current is latched in row, management and running personnel is facilitated to slap in advance
Power networks risk is held, formulates failure handling program in advance.Alternating current filter is failure to actuate after DC Line Fault occurs for direct current system, because
This is all loaded on the filter of system due to the System Reactive Power after DC Line Fault, and is fully transferred to exchange by filter
System leads to the idle increase of AC system, and voltage is substantially increased, and AC system is likely to occur the risk of voltage ride-through, jeopardizes and is
System safe and stable operation.Fault point and network can be accurately calculated according to the change in topology after failure by on-line analysis software
Trend distribution, it is interior in short-term after a failure to consider steady-state process and provide analysis as a result, ensureing the stable operation of adjacent power grid, it is ensured that
Relevant device is not judged by accident and malfunction.But alternating current filter action situation is not considered when analyzing direct current locking forecast failure, with
Actual conditions are not inconsistent, and the converter station bus steady state voltage deviation caused is larger, and accuracy is low.
Summary of the invention
In order to overcome the shortcomings of that the above-mentioned bus of converter station in the prior art steady state voltage deviation is larger and accuracy is low, this hair
It is bright a kind of locking of direct current is provided after converter station bus steady state voltage determine method and apparatus, after direct current, which is latched, to be occurred, calculating is changed
Stream station exchanges idle amount with AC system；Judge converter station exchanged with AC system idle amount whether meet it is predetermined idle
Exchange dead zone section, when being unsatisfactory for reactive power exchange dead zone section, by put into or cut off alternating current filter adjust converter station with
AC system exchanges idle amount；Idle amount, which is exchanged, with AC system based on the converter station determines converter station bus steady state voltage；
The reactive power exchange dead zone section of converter station is determined based on the reactive power exchange reference value of converter station, it is contemplated that ac filter in converter station
Device action situation, is consistent with actual conditions, and obtained converter station bus steady state voltage deviation is smaller, and accuracy is high.
In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme that:
On the one hand, converter station bus steady state voltage determines method after the present invention provides a kind of locking of direct current, comprising:
After direct current, which is latched, to be occurred, calculates converter station and exchange idle amount with AC system；
Judge that the converter station exchanges whether idle amount meets predetermined reactive power exchange dead zone section with AC system,
When being unsatisfactory for reactive power exchange dead zone section, nothing is exchanged with AC system by putting into or cutting off alternating current filter adjustment converter station
Function amount；
Idle amount, which is exchanged, with AC system based on the converter station determines converter station bus steady state voltage；
The reactive power exchange dead zone section of the converter station is determined based on the reactive power exchange reference value of converter station.
The reactive power exchange dead zone section of the converter station includes:
[Q0-Qthreshold,Q0+Qthreshold]
In formula, QthresholdIndicate the reactive power exchange threshold value of converter station；Q0It indicates converter station reactive power exchange reference value, presses
Following formula determines:
In formula, P0Indicate the active power value of converter station transmission, PuplimIndicate the active power upper limit value of converter station,
PdownlimIndicate the active power upper limit value of converter station, m is conversion coefficient.
The converter station exchanges the determination of idle amount, such as following formula with AC system:
In formula, QtransIndicate that converter station exchanges idle amount, Q with AC systemlniIndicate connect with converter station bus i-th
Inlet wire reactive power exchange amount, QlnjIndicate the j-th strip outlet reactive power exchange amount connecting with converter station bus, n is indicated into number of lines, m
Represent number of lines.
It is described when exchanging idle amount when converter station with AC system and being unsatisfactory for reactive power exchange dead zone section, by putting into or cutting
Except alternating current filter adjustment converter station exchanges idle amount with AC system, comprising:
Work as Qtrans> Q0+QthresholdWhen, the alternating current filter in converter station is put into, adjustment converter station and AC system are handed over
Change idle amount；
Work as Qtrans< Q0-QthresholdWhen, the alternating current filter in converter station is cut off, adjustment converter station and AC system are handed over
Change idle amount.
It is described idle amount is exchanged with AC system based on converter station to determine converter station bus steady state voltage, comprising:
Idle amount is exchanged with AC system based on converter station, and converter station bus stable state is calculated using steady parameter algorithm
Voltage.
It is exchanged based on converter station with AC system after idle amount determines converter station bus steady state voltage, comprising:
The state of converter station bus is determined based on converter station bus steady state voltage；
State based on converter station bus provides prompt information.
The determination of the state of the converter station bus, comprising:
Work as Ubus_after> (1+ σ) UnormalWhen, determine that the state of converter station bus is to get over upper limit state；
Work as Ubus_after< (1- σ) UnormalWhen, determine that the state of converter station bus is to get over lower limit state；
As (1- σ) Unormal≤Ubus_after≤(1+σ)UnormalWhen, determine that the state of converter station bus is normal condition；
Wherein, UnormalIndicate the reference voltage of converter station bus, Ubus_afterIndicate converter station bus after direct current is latched
Voltage, σ indicate the out-of-limit percent coefficient of setting.
The state based on converter station bus provides prompt information, comprising:
Converter station bus based on more upper limit state and more the converter station bus of lower limit state provide prompt information.
It is described to be exchanged based on converter station with AC system after idle amount determines converter station bus steady state voltage, further includes:
Idle amount is exchanged with AC system based on converter station, determines that the maximum pressure of electric system rises using steady-state load flow algorithm
And maximum pressure drop；
Determine that maximum pressure rises bus based on the maximum pressure liter of electric system, and determining most based on the maximum pressure drop of electric system
Big pressure drop bus；
Liter bus and maximum pressure drop bus is pressed to provide prompt information based on maximum.
The maximum pressure of the electric system rises and the determination of maximum pressure drop, such as following formula:
ΔUmax=max (Uafter-Ubefore)
ΔUmin=min (Uafter-Ubefore)
In formula, Δ UmaxThe maximum of electric system presses liter, Δ U after indicating direct current lockingminPower train after expression direct current locking
The maximum pressure drop of system, UafterIndicate the steady state voltage of any bus in electric system after direct current is latched, UbeforeIndicate direct current locking
The steady state voltage of any bus in preceding electric system.
On the other hand, the present invention also provides converter station bus steady state voltage determining devices after a kind of locking of direct current, comprising:
Computing module, for calculating converter station and exchanging idle amount with AC system after direct current is latched generation；
Adjust module, exchange for judging the converter station with AC system idle amount whether meet it is predetermined idle
Exchange dead zone section, when being unsatisfactory for reactive power exchange dead zone section, by put into or cut off alternating current filter adjust converter station with
AC system exchanges idle amount；Reactive power exchange reference value of the reactive power exchange dead zone section of the converter station based on converter station is true
It is fixed.
Determining module determines converter station bus stable state electricity for exchanging idle amount with AC system based on the converter station
Pressure.
The adjustment module determines the reactive power exchange dead zone section of converter station as the following formula:
[Q0-Qthreshold,Q0+Qthreshold]
In formula, QthresholdIndicate the reactive power exchange threshold value of converter station；Q0It indicates converter station reactive power exchange reference value, presses
Following formula determines:
In formula, P0Indicate the active power value of converter station transmission, PuplimIndicate the active power upper limit value of converter station,
PdownlimIndicate the active power upper limit value of converter station, m is conversion coefficient.
The computing module determines that converter station exchanges idle amount with AC system as the following formula:
In formula, QtransIndicate that converter station exchanges idle amount, Q with AC systemlniIndicate connect with converter station bus i-th
Inlet wire reactive power exchange amount, QlnjIndicate the j-th strip outlet reactive power exchange amount connecting with converter station bus, n is indicated into number of lines, m
Represent number of lines.
The adjustment module is specifically used for:
Work as Qtrans> Q0+QthresholdWhen, the alternating current filter in converter station is put into, adjustment converter station and AC system are handed over
Change idle amount；
Work as Qtrans< Q0-QthresholdWhen, the alternating current filter in converter station is cut off, adjustment converter station and AC system are handed over
Change idle amount.
The determining module is specifically used for:
Idle amount is exchanged with AC system based on converter station, and converter station bus stable state is calculated using steady parameter algorithm
Voltage.
Described device further include:
State determining module, for determining the state of converter station bus based on converter station bus steady state voltage；
First cue module provides prompt information for the state based on converter station bus.
The state determining module is specifically used for:
Work as Ubus_after> (1+ σ) UnormalWhen, determine that the state of converter station bus is to get over upper limit state；
Work as Ubus_after< (1- σ) UnormalWhen, determine that the state of converter station bus is to get over lower limit state；
As (1- σ) Unormal≤Ubus_after≤(1+σ)UnormalWhen, determine that the state of converter station bus is normal condition；
Wherein, UnormalIndicate the reference voltage of converter station bus, Ubus_afterIndicate converter station bus after direct current is latched
Voltage, σ indicate the out-of-limit percent coefficient of setting.
First cue module is specifically used for:
Converter station bus based on more upper limit state and more the converter station bus of lower limit state provide prompt information.
Described device further include:
Maximum differential pressure determining module, for exchanging idle amount with AC system based on converter station, using steady-state load flow algorithm
Determine the maximum pressure liter and maximum pressure drop of electric system；
Maximum differential pressure bus determining module rises for the maximum pressure based on electric system and determines that maximum pressure rises bus, and base
Maximum pressure drop bus is determined in the maximum pressure drop of electric system；
Second cue module, for providing prompt information based on maximum pressure liter bus and maximum pressure drop bus.
The maximum differential pressure determining module determines the maximum pressure liter and maximum pressure drop of electric system as the following formula:
ΔUmax=max (Uafter-Ubefore)
ΔUmin=min (Uafter-Ubefore)
In formula, Δ UmaxThe maximum of electric system presses liter, Δ U after indicating direct current lockingminPower train after expression direct current locking
The maximum pressure drop of system, UafterIndicate the steady state voltage of any bus in electric system after direct current is latched, UbeforeIndicate direct current locking
The steady state voltage of any bus in preceding electric system.
Compared with the immediate prior art, technical solution provided by the invention is had the advantages that
Converter station bus steady state voltage determines method after direct current locking provided by the invention, after direct current, which is latched, to be occurred, meter
It calculates converter station and exchanges idle amount with AC system；Judge converter station exchanged with AC system idle amount whether meet it is predetermined
Reactive power exchange dead zone section adjusts the change of current by putting into or cutting off alternating current filter when being unsatisfactory for reactive power exchange dead zone section
It stands and exchanges idle amount with AC system；Idle amount, which is exchanged, with AC system based on the converter station determines converter station bus stable state electricity
Pressure；The reactive power exchange dead zone section of converter station is determined based on the reactive power exchange reference value of converter station, it is contemplated that is exchanged in converter station
Filter action situation, is consistent with actual conditions, and obtained converter station bus steady state voltage deviation is smaller, and accuracy is high；
Converter station bus steady state voltage determining device includes computing module, adjustment module after direct current locking provided by the invention
And determining module, computing module, for calculating converter station and exchanging idle amount with AC system after direct current is latched generation；Adjustment
Module exchanges whether idle amount meets predetermined reactive power exchange dead zone section with AC system for judging converter station, when
When being unsatisfactory for reactive power exchange dead zone section, by put into or cut off alternating current filter adjust converter station exchange with AC system it is idle
Amount；Determining module determines converter station bus steady state voltage for exchanging idle amount with AC system based on the converter station；The change of current
The reactive power exchange dead zone section stood is determined based on the reactive power exchange reference value of converter station, it is contemplated that alternating current filter is dynamic in converter station
Make situation, be consistent with actual conditions, obtained converter station bus steady state voltage deviation is smaller, and accuracy is high；
Technical solution provided by the invention guarantees converter station bus steady state voltage accuracy, simple and efficient and practical,
And it can ensure the safe and stable operation of bulk power grid.
Detailed description of the invention
Fig. 1 is that converter station bus steady state voltage determines method flow diagram after direct current locking in the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Embodiment 1
Converter station bus steady state voltage determines method, detailed process after the embodiment of the present invention 1 provides a kind of locking of direct current
Figure is as shown in Figure 1, detailed process is as follows:
S101: it after direct current, which is latched, to be occurred, calculates converter station and exchanges idle amount with AC system；
S102: judge that converter station exchanges whether idle amount meets predetermined reactive power exchange dead zone area with AC system
Between, if converter station exchanges the reactive power exchange dead zone section that idle amount meets converter station with AC system, without to converter station with
AC system exchanges idle amount and is adjusted, and is unsatisfactory for reactive power exchange dead zone section when converter station exchanges idle amount with AC system
When, idle amount is exchanged with AC system by putting into or cutting off alternating current filter adjustment converter station；
S103: idle amount is exchanged with AC system based on converter station and determines converter station bus steady state voltage.
The reactive power exchange dead zone section of above-mentioned converter station is determined based on the reactive power exchange reference value of converter station.
The reactive power exchange dead zone section of above-mentioned converter station includes:
[Q0-Qthreshold,Q0+Qthreshold]
In formula, QthresholdIndicate the reactive power exchange threshold value of converter station；Q0Indicate converter station reactive power exchange reference value；
According to the performance number size of route conveying before and after direct current forecast failure, converter station reactive power exchange reference value is divided
Grade setting, converter station reactive power exchange reference value need to comprehensively consider converter station voltage class, alternating current filter configuring condition and ground
The characteristics of area's Net Frame of Electric Network, is configured, therefore converter station reactive power exchange reference value determines as the following formula:
In formula, P0Indicate the active power value of converter station transmission, PuplimIndicate the active power upper limit value of converter station,
PdownlimIndicate the active power upper limit value of converter station, m is conversion coefficient.
Above-mentioned converter station exchanges the determination of idle amount, such as following formula with AC system:
In formula, QtransIndicate that converter station exchanges idle amount, Q with AC systemlniIndicate connect with converter station bus i-th
Inlet wire reactive power exchange amount, QlnjIndicate the j-th strip outlet reactive power exchange amount connecting with converter station bus, n is indicated into number of lines, m
Represent number of lines.
In above-mentioned S102, when converter station, which exchanges idle amount with AC system, is unsatisfactory for reactive power exchange dead zone section, pass through
Investment or excision alternating current filter adjustment converter station exchange idle amount with AC system, are specifically divided into following two situation:
Work as Qtrans> Q0+QthresholdWhen, the alternating current filter in converter station is put into, adjustment converter station and AC system are handed over
Change idle amount；
Work as Qtrans< Q0-QthresholdWhen, the alternating current filter in converter station is cut off, adjustment converter station and AC system are handed over
Change idle amount.
In above-mentioned S102, when converter station, which exchanges idle amount with AC system, is unsatisfactory for reactive power exchange dead zone section, pass through
After investment or excision alternating current filter adjustment converter station exchange idle amount with AC system, following information is obtained: before direct current locking
Alternating current filter number, converter station cut off exchange after absorbing idle amount, reactive power exchange dead zone section, direct current locking from AC system
After number of filter, failure converter station from AC system absorb idle amount, failure after reactive power exchange dead zone section.
In above-mentioned S103, idle amount is exchanged with AC system based on converter station and determines converter station bus steady state voltage, specifically
Process is as follows:
Idle amount is exchanged with AC system based on converter station, and converter station bus stable state is calculated using steady parameter algorithm
Voltage.
It is exchanged based on converter station with AC system after idle amount determines converter station bus steady state voltage, it is also necessary to continue such as
Lower operation:
The state of converter station bus is determined based on converter station bus steady state voltage；
State based on converter station bus provides prompt information.
The determination of the state of above-mentioned converter station bus is specifically divided into following three kinds of situations:
Work as Ubus_after> (1+ σ) UnormalWhen, determine that the state of converter station bus is to get over upper limit state；
Work as Ubus_after< (1- σ) UnormalWhen, determine that the state of converter station bus is to get over lower limit state；
As (1- σ) Unormal≤Ubus_after≤(1+σ)UnormalWhen, determine that the state of converter station bus is normal condition；
Wherein, UnormalIndicate the reference voltage of converter station bus, Ubus_afterIndicate converter station bus after direct current is latched
Voltage, σ indicate the out-of-limit percent coefficient of setting.
The above-mentioned state based on converter station bus provides prompt information, specifically the converter station bus based on more upper limit state
The converter station bus of more lower limit state provides prompt information.
Above-mentioned S103's is exchanged with AC system based on converter station after idle amount determines converter station bus steady state voltage, also
It can perform the following operations:
Idle amount is exchanged with AC system based on converter station, determines that the maximum pressure of electric system rises using steady-state load flow algorithm
And maximum pressure drop；
Determine that maximum pressure rises bus based on the maximum pressure liter of electric system, and determining most based on the maximum pressure drop of electric system
Big pressure drop bus；
Liter bus and maximum pressure drop bus is pressed to provide prompt information based on maximum.
The maximum pressure of above-mentioned electric system rises and the determination of maximum pressure drop, such as following formula:
ΔUmax=max (Uafter-Ubefore)
ΔUmin=min (Uafter-Ubefore)
In formula, Δ UmaxThe maximum of electric system presses liter, Δ U after indicating direct current lockingminPower train after expression direct current locking
The maximum pressure drop of system, UafterIndicate the steady state voltage of any bus in electric system after direct current is latched, UbeforeIndicate direct current locking
The steady state voltage of any bus in preceding electric system.
Embodiment 2
Based on the same inventive concept, the embodiment of the present invention 2 also provides converter station bus steady state voltage after a kind of locking of direct current
Determining device, including computing module, adjustment module and determining module, below carry out specifically the function of above-mentioned several modules
It is bright:
Computing module therein, for calculating converter station and exchanging idle amount with AC system after direct current is latched generation；
Adjustment module therein exchanges whether idle amount meets predetermined nothing with AC system for judging converter station
Function exchanges dead zone section, when being unsatisfactory for reactive power exchange dead zone section, adjusts converter station by putting into or cutting off alternating current filter
Idle amount is exchanged with AC system；Reactive power exchange reference value of the reactive power exchange dead zone section of above-mentioned converter station based on converter station is true
It is fixed；
Determining module therein determines converter station bus stable state electricity for exchanging idle amount with AC system based on converter station
Pressure.
Above-mentioned adjustment module determines the reactive power exchange dead zone section of converter station as the following formula:
[Q0-Qthreshold,Q0+Qthreshold]
In formula, QthresholdIndicate the reactive power exchange threshold value of converter station；Q0It indicates converter station reactive power exchange reference value, presses
Following formula determines:
In formula, P0Indicate the active power value of converter station transmission, PuplimIndicate the active power upper limit value of converter station,
PdownlimIndicate the active power upper limit value of converter station, m is conversion coefficient.
Above-mentioned computing module determines that converter station exchanges idle amount with AC system as the following formula:
In formula, QtransIndicate that converter station exchanges idle amount, Q with AC systemlniIndicate connect with converter station bus i-th
Inlet wire reactive power exchange amount, QlnjIndicate the j-th strip outlet reactive power exchange amount connecting with converter station bus, n is indicated into number of lines, m
Represent number of lines.
Above-mentioned adjustment module is specifically used for:
Work as Qtrans> Q0+QthresholdWhen, the alternating current filter in converter station is put into, adjustment converter station and AC system are handed over
Change idle amount；
Work as Qtrans< Q0-QthresholdWhen, the alternating current filter in converter station is cut off, adjustment converter station and AC system are handed over
Change idle amount.
Above-mentioned determining module is specifically used for:
Idle amount is exchanged with AC system based on converter station, and converter station bus stable state is calculated using steady parameter algorithm
Voltage；
The device that the embodiment of the present invention 2 provides further include:
State determining module, for determining the state of converter station bus based on converter station bus steady state voltage；
First cue module provides prompt information for the state based on converter station bus.
Above-mentioned state determining module determines the state of converter station bus based on converter station bus steady state voltage, and detailed process is such as
Under:
Work as Ubus_after> (1+ σ) UnormalWhen, determine that the state of converter station bus is to get over upper limit state；
Work as Ubus_after< (1- σ) UnormalWhen, determine that the state of converter station bus is to get over lower limit state；
As (1- σ) Unormal≤Ubus_after≤(1+σ)UnormalWhen, determine that the state of converter station bus is normal condition；
Wherein, UnormalIndicate the reference voltage of converter station bus, Ubus_afterIndicate converter station bus after direct current is latched
Voltage, σ indicate the out-of-limit percent coefficient of setting.
Above-mentioned first cue module be specifically based on more upper limit state converter station bus and more lower limit state converter station it is female
Line provides prompt information.
Converter station bus steady state voltage determining device after the direct current locking that the embodiment of the present invention 2 provides further include:
Maximum differential pressure determining module, for exchanging idle amount with AC system based on converter station, using steady-state load flow algorithm
Determine the maximum pressure liter and maximum pressure drop of electric system；
Maximum differential pressure bus determining module rises for the maximum pressure based on electric system and determines that maximum pressure rises bus, and base
Maximum pressure drop bus is determined in the maximum pressure drop of electric system；
Second cue module, for providing prompt information based on maximum pressure liter bus and maximum pressure drop bus.
Above-mentioned maximum differential pressure determining module determines the maximum pressure liter and maximum pressure drop of electric system as the following formula:
ΔUmax=max (Uafter-Ubefore)
ΔUmin=min (Uafter-Ubefore)
In formula, Δ UmaxThe maximum of electric system presses liter, Δ U after indicating direct current lockingminPower train after expression direct current locking
The maximum pressure drop of system, UafterIndicate the steady state voltage of any bus in electric system after direct current is latched, UbeforeIndicate direct current locking
The steady state voltage of any bus in preceding electric system.
For convenience of description, each section of apparatus described above is divided into various modules with function or unit describes respectively.
Certainly, each module or the function of unit can be realized in same or multiple softwares or hardware when implementing the application.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field can still modify to a specific embodiment of the invention referring to above-described embodiment or
Equivalent replacement, these are applying for this pending hair without departing from any modification of spirit and scope of the invention or equivalent replacement
Within bright claims.
Claims (20)
1. converter station bus steady state voltage determines method after a kind of direct current locking characterized by comprising
After direct current, which is latched, to be occurred, calculates converter station and exchange idle amount with AC system；
Judge that the converter station exchanges whether idle amount meets predetermined reactive power exchange dead zone section with AC system, when not
When meeting reactive power exchange dead zone section, by put into or cut off alternating current filter adjust converter station exchange with AC system it is idle
Amount；
Idle amount, which is exchanged, with AC system based on the converter station determines converter station bus steady state voltage；
The reactive power exchange dead zone section of the converter station is determined based on the reactive power exchange reference value of converter station.
2. converter station bus steady state voltage determines method after direct current locking according to claim 1, which is characterized in that described
The reactive power exchange dead zone section of converter station includes:
[Q0-Qthreshold,Q0+Qthreshold]
In formula, QthresholdIndicate the reactive power exchange threshold value of converter station；Q0Indicate converter station reactive power exchange reference value, it is true as the following formula
It is fixed:
In formula, P0Indicate the active power value of converter station transmission, PuplimIndicate the active power upper limit value of converter station, PdownlimTable
Show the active power upper limit value of converter station, m is conversion coefficient.
3. converter station bus steady state voltage determines method after direct current locking according to claim 2, which is characterized in that described
Converter station exchanges the determination of idle amount, such as following formula with AC system:
In formula, QtransIndicate that converter station exchanges idle amount, Q with AC systemlniIndicate connect with converter station bus i-th into
Line reactive power exchange amount, QlnjIndicate the j-th strip outlet reactive power exchange amount connecting with converter station bus, n indicates that, into number of lines, m is indicated
Number of lines out.
4. converter station bus steady state voltage determines method after direct current locking according to claim 3, which is characterized in that described
When converter station, which exchanges idle amount with AC system, is unsatisfactory for reactive power exchange dead zone section, by putting into or cutting off alternating current filter
Adjustment converter station exchanges idle amount with AC system, comprising:
Work as Qtrans> Q0+QthresholdWhen, the alternating current filter in converter station is put into, converter station is adjusted with AC system and exchanges nothing
Function amount；
Work as Qtrans< Q0-QthresholdWhen, the alternating current filter in converter station is cut off, converter station is adjusted with AC system and exchanges nothing
Function amount.
5. converter station bus steady state voltage determines method after direct current locking according to claim 1, which is characterized in that described
Idle amount, which is exchanged, with AC system based on converter station determines converter station bus steady state voltage, comprising:
Idle amount is exchanged with AC system based on converter station, and converter station bus stable state electricity is calculated using steady parameter algorithm
Pressure.
6. converter station bus steady state voltage determines method after direct current locking according to claim 1 or 5, which is characterized in that
It is described to be exchanged based on converter station with AC system after idle amount determines converter station bus steady state voltage, comprising:
The state of converter station bus is determined based on converter station bus steady state voltage；
State based on converter station bus provides prompt information.
7. converter station bus steady state voltage determines method after direct current locking according to claim 6, which is characterized in that described
The determination of the state of converter station bus, comprising:
Work as Ubus_after> (1+ σ) UnormalWhen, determine that the state of converter station bus is to get over upper limit state；
Work as Ubus_after< (1- σ) UnormalWhen, determine that the state of converter station bus is to get over lower limit state；
As (1- σ) Unormal≤Ubus_after≤(1+σ)UnormalWhen, determine that the state of converter station bus is normal condition；
Wherein, UnormalIndicate the reference voltage of converter station bus, Ubus_afterIndicate the voltage of converter station bus after direct current is latched,
σ indicates the out-of-limit percent coefficient of setting.
8. converter station bus steady state voltage determines method after direct current locking according to claim 7, which is characterized in that described
State based on converter station bus provides prompt information, comprising:
Converter station bus based on more upper limit state and more the converter station bus of lower limit state provide prompt information.
9. converter station bus steady state voltage determines method after direct current locking according to claim 6, which is characterized in that described
It is exchanged based on converter station with AC system after idle amount determines converter station bus steady state voltage, further includes:
Idle amount is exchanged with AC system based on converter station, determines that the maximum pressure of electric system rises and most using steady-state load flow algorithm
Big pressure drop；
Determine that maximum pressure rises bus based on the maximum pressure liter of electric system, and based on the determining maximum pressure of the maximum pressure drop of electric system
Bus drops；
Liter bus and maximum pressure drop bus is pressed to provide prompt information based on maximum.
10. converter station bus steady state voltage determines method after direct current locking according to claim 9, which is characterized in that institute
The maximum pressure for stating electric system rises and the determination of maximum pressure drop, such as following formula:
ΔUmax=max (Uafter-Ubefore)
ΔUmin=min (Uafter-Ubefore)
In formula, Δ UmaxThe maximum of electric system presses liter, Δ U after indicating direct current lockingminIndicate electric system after direct current is latched
Maximum pressure drop, UafterIndicate the steady state voltage of any bus in electric system after direct current is latched, UbeforeIndicate the preceding electricity of direct current locking
The steady state voltage of any bus in Force system.
11. converter station bus steady state voltage determining device after a kind of direct current locking characterized by comprising
Computing module, for calculating converter station and exchanging idle amount with AC system after direct current is latched generation；
Module is adjusted, exchanges whether idle amount meets predetermined reactive power exchange with AC system for judging the converter station
Dead zone section, when being unsatisfactory for reactive power exchange dead zone section, by put into or cut off alternating current filter adjust converter station with exchange
Amount that systems exchange is idle；The reactive power exchange dead zone section of the converter station is determined based on the reactive power exchange reference value of converter station；
Determining module determines converter station bus steady state voltage for exchanging idle amount with AC system based on the converter station.
12. converter station bus steady state voltage determining device after direct current locking according to claim 11, which is characterized in that institute
State the reactive power exchange dead zone section that adjustment module determines converter station as the following formula:
[Q0-Qthreshold,Q0+Qthreshold]
In formula, QthresholdIndicate the reactive power exchange threshold value of converter station；Q0Indicate converter station reactive power exchange reference value, it is true as the following formula
It is fixed:
In formula, P0Indicate the active power value of converter station transmission, PuplimIndicate the active power upper limit value of converter station, PdownlimTable
Show the active power upper limit value of converter station, m is conversion coefficient.
13. converter station bus steady state voltage determining device after direct current locking according to claim 12, which is characterized in that institute
It states computing module and determines that converter station exchanges idle amount with AC system as the following formula:
In formula, QtransIndicate that converter station exchanges idle amount, Q with AC systemlniIndicate connect with converter station bus i-th into
Line reactive power exchange amount, QlnjIndicate the j-th strip outlet reactive power exchange amount connecting with converter station bus, n indicates that, into number of lines, m is indicated
Number of lines out.
14. converter station bus steady state voltage determining device after direct current locking according to claim 13, which is characterized in that institute
Adjustment module is stated to be specifically used for:
Work as Qtrans> Q0+QthresholdWhen, the alternating current filter in converter station is put into, converter station is adjusted with AC system and exchanges nothing
Function amount；
Work as Qtrans< Q0-QthresholdWhen, the alternating current filter in converter station is cut off, converter station is adjusted with AC system and exchanges nothing
Function amount.
15. converter station bus steady state voltage determining device after direct current locking according to claim 11, which is characterized in that institute
Determining module is stated to be specifically used for:
Idle amount is exchanged with AC system based on converter station, and converter station bus stable state electricity is calculated using steady parameter algorithm
Pressure.
16. converter station bus steady state voltage determining device after the locking of direct current described in 1 or 15, feature exist according to claim 1
In described device further include:
State determining module, for determining the state of converter station bus based on converter station bus steady state voltage；
First cue module provides prompt information for the state based on converter station bus.
17. converter station bus steady state voltage determining device after direct current locking according to claim 16, which is characterized in that institute
State determining module is stated to be specifically used for:
Work as Ubus_after> (1+ σ) UnormalWhen, determine that the state of converter station bus is to get over upper limit state；
Work as Ubus_after< (1- σ) UnormalWhen, determine that the state of converter station bus is to get over lower limit state；
As (1- σ) Unormal≤Ubus_after≤(1+σ)UnormalWhen, determine that the state of converter station bus is normal condition；
Wherein, UnormalIndicate the reference voltage of converter station bus, Ubus_afterIndicate the voltage of converter station bus after direct current is latched,
σ indicates the out-of-limit percent coefficient of setting.
18. converter station bus steady state voltage determining device after direct current locking according to claim 17, which is characterized in that institute
The first cue module is stated to be specifically used for:
Converter station bus based on more upper limit state and more the converter station bus of lower limit state provide prompt information.
19. converter station bus steady state voltage determining device after direct current locking according to claim 16, which is characterized in that institute
State device further include:
Maximum differential pressure determining module, the idle amount for being exchanged based on converter station with AC system are true using steady-state load flow algorithm
The maximum pressure for determining electric system rises and maximum pressure drop；
Maximum differential pressure bus determining module rises for the maximum pressure based on electric system and determines that maximum pressure rises bus, and based on electricity
The maximum pressure drop of Force system determines maximum pressure drop bus；
Second cue module, for providing prompt information based on maximum pressure liter bus and maximum pressure drop bus.
20. converter station bus steady state voltage determining device after direct current locking according to claim 19, which is characterized in that institute
State maximum pressure liter and maximum pressure drop that maximum differential pressure determining module determines electric system as the following formula:
ΔUmax=max (Uafter-Ubefore)
ΔUmin=min (Uafter-Ubefore)
In formula, Δ UmaxThe maximum of electric system presses liter, Δ U after indicating direct current lockingminIndicate electric system after direct current is latched
Maximum pressure drop, UafterIndicate the steady state voltage of any bus in electric system after direct current is latched, UbeforeIndicate the preceding electricity of direct current locking
The steady state voltage of any bus in Force system.
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| CN112039102A (en) * | 2020-04-24 | 2020-12-04 | 国家电网有限公司 | Method and device for determining control range of converter bus voltage before direct-current unlocking |
| CN112039102B (en) * | 2020-04-24 | 2022-04-15 | 国家电网有限公司 | Method and device for determining control range of converter bus voltage before direct-current unlocking |
| CN111697608A (en) * | 2020-04-26 | 2020-09-22 | 国家电网有限公司 | Method and system for determining voltage operation range of converter bus |
| CN111835020A (en) * | 2020-08-10 | 2020-10-27 | 中国南方电网有限责任公司超高压输电公司柳州局 | Converter station reactive power optimization method considering main transformer low-voltage side reactive power compensation device |
| CN111835020B (en) * | 2020-08-10 | 2021-04-20 | 中国南方电网有限责任公司超高压输电公司柳州局 | Converter station reactive power optimization method considering main transformer low-voltage side reactive power compensation device |
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