CN107294096A - A kind of determination unit function coefficient method for considering alternating current filter - Google Patents
A kind of determination unit function coefficient method for considering alternating current filter Download PDFInfo
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
A kind of method for the determination unit function coefficient for considering alternating current filter of the present invention, belong to generator failure analysis field, influence of the alternating current filter to circuit in circuit is have ignored for traditional unit function coefficient analytic approach, the method of determination unit function coefficient hair of the present invention based on subsynchronous concussion analysis, double tunning ripple alternating current filter is added in systems, including：Adjust AC harmonic filter to be added to rectification side in high voltage direct current converter system by more；Consider the capacity reactive compensation influences for adjusting AC harmonic filter to DC transmission system more；Three short circuit current between new direct current transportation converting plant and generating set on ac bus is obtained by short circuit calculation, three-phase shortcircuit capacity calculation methods on direct current transportation converting plant ac bus are improved, so as to further improve the method for determining unit function coefficient, improve the measurement accuracy of unit function coefficient method, it is highly reliable, this method is used in real process, the risk of subsynchronous concussion is greatly reduced.
Description
Technical field
The invention belongs to generating set failure analysis techniques field, it is specifically designed a kind of analyzed based on sub-synchronous oscillation and considers
The method of the determination unit function coefficient of alternating current filter.
Background technology
Current China is building a ten million multikilowatt wind power base, and large-scale wind power is sent outside as inevitable.And install string additional
The kind important way that the super ultra-high voltage AC transmission and D.C. high voltage transmission of benefit electric capacity are sent outside as large-scale wind power may be lured
Send out sub-synchronous oscillation problem.Therefore large-scale wind power is sent outside sub-synchronous oscillation mechanism carry out grind make internal disorder or usurp it is significant.High pressure
Advantage of the direct current transportation by its advanced technology and economically is widely used in terms of power system transmission of electricity, at me
Played an important role in the West-to-East Electricity Transmission Project of state.But people are also, it is realized that in certain system architecture and operation
Under mode, HVDC easily causes sub-synchronous oscillation (SSO) problem for the Turbo-generator Set being connected with rectification side, in modern electricity
Need to study the ac and dc systemses safety and stability sex chromosome mosaicism that SSO is brought in Force system planning, operation, and analyse in depth detection direct current
Transmission system causes SSO method to be of great importance for power system, while no matter causing the work of SSO phenomenons to research
With mechanism or its braking measure will several significances, with important construction value.
For sub-synchronous oscillation problem, a variety of effective analysis methods are formd, such as：Unit function coefficient is analyzed
Method, impedance scan analytic approach, eigenvalue Method, multiple moment coefficient analytic approach, time-domain-simulation analytic approach.Wherein, unit is acted on
Coefficient analysis method is mainly used in qualitative analysis and filters out the unit and operating condition that there is the anti-risk of subsynchronous battle array, and it has meter
Calculation method is simple, speed fast, the advantages of required basic data is less.
But traditional unit function coefficient analytic approach have ignored influence of the alternating current filter to circuit in circuit, from generator
The alternating current sent needs to be filtered it with alternating current filter before HVDC transmission line is sent to by converting plant,
The purpose is to by unwanted current harmonics with switching to power supply.Alternating current filter has the effect of reactive-load compensation to system, complete
The full influence factor for not considering alternating current filter, it is difficult to the sub-synchronous oscillation risk of effecting reaction unit.
The content of the invention
An object of the present invention is to provide a kind of method for the determination unit function coefficient analyzed based on this synchronization side of shaking,
Consider influence of the alternating current filter to circuit, improve conventional rack function coefficient computational methods, the computational methods to its parameter are entered
Row is perfect, is influenceed with solving reactive-load compensation of the alternating current filter on circuit in the prior art, improves computational accuracy.
In some illustrative embodiments, the method for the determination unit function coefficient analyzed based on sub-synchronous oscillation,
Double tunning ripple alternating current filter is added in systems, including：Adjust AC harmonic filter to be added to high voltage direct current converter system by more
Rectification side in system；Consider the capacity reactive compensation influences for adjusting AC harmonic filter to DC transmission system more；Pass through short circuit meter
The three-phase shortcircuit obtained between new direct current transportation converting plant and generating set on ac bus is calculated to stop；According to new short circuit electricity
Stream, it is determined that new unit function coefficient, analyzes its value and the relation of detection sub-synchronous oscillation.
Compared with prior art, illustrative embodiment of the invention includes advantages below：
The present invention considers that the alternating current filter in HVDC transmission system between converting plant and generating set is idle and mended
Situation is repaid, by short circuit calculation, is improved to obtaining three-phase shortcircuit capacity calculation methods on direct current transportation converting plant ac bus,
So as to further improve the method for determining unit function coefficient, the measurement accuracy of unit function coefficient method is improved, it is highly reliable,
This method is used in real process, the risk of sub-synchronous oscillation is greatly reduced.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright is that schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the flow chart of the illustrative embodiment according to the present invention；
Fig. 2 is the present embodiment HVDC transmission system circuit diagram.
Fig. 3 is many tune AC harmonic filter circuit diagrams and its equivalent circuit diagram；
Equivalent circuit diagram and its between converting plant and generating set when Fig. 4 is embodiment D.C. high voltage transmission normal work
F points short circuit equivalent circuit diagram；
Embodiment
In the following detailed description, a large amount of specific details are proposed, in order to provide thorough understanding of the present invention.Do not carry
Go out specific component and circuit, but simplification turns into equivalent circuit, but those skilled in the art can not have other specific
The present invention is understood under details.In other cases, circuit, component, method, the formula on basis is not discussed in detail, in order to avoid
Influence the understanding of the present invention.
Patent of the present invention proposes a kind of determination unit function coefficient method for considering alternating current filter, subsynchronous to detecting
The unit function coefficient method of oscillatory condition is improved, it is necessary to consider the shadow that alternating current filter is produced to D.C. high voltage transmission
Ring, form new unit function coefficient formula, be improved on original unit effect formula, further increase calculating
Efficiency and accuracy.
As shown in figure 1, disclosing a kind of method for the determination unit function coefficient analyzed based on sub-synchronous oscillation：
1st, adjust AC harmonic filter to be added to rectification side in high voltage direct current converter system by more；
2nd, consider the capacity reactive compensation influences for adjusting AC harmonic filter to DC transmission system more；
3rd, the three-phase obtained by short circuit calculation between new direct current transportation converting plant and generating set on ac bus is short
Road stops；
4th, according to new short circuit current flow, it is determined that new unit function coefficient, analyzes its value and detection sub-synchronous oscillation
Relation.
As shown in Fig. 2 adding many tune AC harmonic filters in original HVDC transmission system rectification side, form new
System circuit diagram.
Many tune AC harmonic filters are added between HVDC transmission system converting plant and generating set, its function is
By unwanted current harmonics with switching to power supply.
It is adjust AC harmonic filter to eliminate the harmonic wave of 2 different frequencies simultaneously relative to dull harmonic filter more,
Two dull harmonic filters can be equivalent to.
According to Fig. 2, Fig. 4 can be obtained to consider the HVDC transmission system equivalent circuit of alternating current filter, so that according to figure
3rd, Fig. 4 carries out short circuit calculation.
As shown in figure 3, adjusting AC harmonic filter circuit diagram, and its equivalent circuit diagram for more.AC harmonic is adjusted according to more
Each resistance of wave filter, electric capacity, inductance parameters, determine its impedance：
In formula, Z (ω) is the equiva lent impedances for adjusting AC harmonic filter to produce reactive power compensation part more；ω is exchange
Resonance filter resonant frequency；C1, L1The respectively capacitance and inductance value of AC harmonic filter part in series；Ci, LiRespectively
For the capacitance and inductance value of AC harmonic filter parallel connection part；K is that AC harmonic filter can filter out different frequency harmonic wave
Quantity (k >=2).
This formula is done to summarize to the equiva lent impedance of the reactive-load compensation part of many tune AC harmonic filters, it is adaptable to basis
Many tune AC harmonic filter equivalent impedances calculating.As n=0 in formula, equivalent to the equivalence resistance of dull harmonic filter
It is anti-, the equivalent impedance as n=1 for multiple-tuned wave filter.During k >=2, the alternating current filter can filter out two or more different frequencies
The harmonic wave of rate.
Circuit load is equivalent to a rated capacity and generating set identical motor, AC harmonic filter is adjusted more according to
Ripple device impedance, calculates its short circuit current flow：
Calculate the equivalent short circuit current flow of generator side：
Calculate the equivalent short circuit current flow in equivalent motor side：
Calculate rectification side ac bus short circuit current flow：
Wherein,For the electric current of circuit between short dot and generator；For generator equivalent electromotive force perunit value；
x1, x2The equivalent reactance of transmission line of electricity respectively between generator equivalent reactance and short dot and generator；Z (ω) is handed over more for adjust
Flow harmonic filter equiva lent impedance；IBFor line current a reference value；For the equivalent electric between equivalent motor and short dot
Stream；For motor equivalent electromotive force；x3For transmission line of electricity equivalent reactance between equivalent motor and short dot；
According to above formula, the three-phase shortcircuit on direct current transportation converting plant ac bus in new unit function coefficient formula is obtained
Capacity calculation methods, the three-phase shortcircuit on direct current transportation converting plant ac bus not include i-th generating set contribution holds
Exemplified by amount：
Wherein, SCi" direct current transportation is influenceed for consideration alternating current filter, the direct current that i-th of generating set is not calculated is defeated
Three-phase shortcircuit capacity on electric system converting plant ac bus,For circuit ac bus rated voltage,To consider that adjust is handed over more
Flow the short circuit current flow of harmonic filter influence.SC"TOTDirect current transportation is influenceed to consider alternating current filter, i-th of hair is calculated
Three-phase shortcircuit capacity on the DC transmission system converting plant ac bus of motor, computational methods same SC "i。
4th, original unit function coefficient calculation formula is improved, obtains new calculation formula, it is characterized in that：To unit
Coefficient S C in function coefficient formulaiAnd SCTOTIt is improved, it is considered influence of the alternating current filter to circuit：
In formula, UIFi" to consider i-th new effect between generating set and direct current transportation of alternating current filter influence
Coefficient；SHVDCFor the rated capacity (MW) of DC transmission system；SiFor the rated capacity (MVA) of i-th generating set.Wherein
SHVDCAnd SiAll it is known when planning and designing power station, DC transmission engineering.
Such scheme is specifically described below：
In AC and DC power system, there is sub-synchronous oscillation problem (abbreviation SSO) caused by direct current transportation to would is that steamer
Generating set produces shafting resonance, causes shafting to damage when serious.Unit function coefficient method is for having with DC transmission system
The subsynchronous oscillation of electrical power system problem of pass and a kind of analysis method put forward.When HVDC converting plants are close to thermal power plant
When, it is easy to because the interaction of turbonator shafting causes sub-synchronous oscillation, therefore IEC/TR60919-3 standards are proposed
Unit function coefficient analytic approach, the risk of sub-synchronous oscillation is caused for assessing HVDC engineerings.
Standard requirement, for any new HVDC transmission system, twists if there is with steam turbine generator
To the Potential feasibility of interaction, its technical specification should be to determine the need for being furtherd investigate and using additional subsynchronous
Data needed for the design studies of damping controller (SSDC) are provided.Unit function coefficient method is represented by：
UIF in formulaiFor the function coefficient of i-th generating set；SHVDCFor the rated capacity of DC transmission system；SiFor i-th
The rated capacity of platform generating set；SCiFor the three-phase shortcircuit capacity on direct current transportation converting plant ac bus, short circuit appearance is calculated
Do not include the contribution of i-th generating set during amount, it is synchronous also not include the effect of alternating current filter；SCTOTFor direct current transportation rectification
Standing includes the three-phase shortcircuit capacity of i-th generating set contribution on ac bus, and exchange filter is not included when calculating the capacity of short circuit
The effect of ripple device.
The purpose of the present invention is that a kind of consideration exchange filter is proposed for the incomprehensive of existing unit function coefficient formula
The improvement computational methods for the influence that ripple device is calculated integrated circuit capacity of short circuit, are characterized between converting plant and generating set
Many tune AC harmonic filters are added, then new circuital current is obtained by short circuit calculation, so as to obtain new capacity of short circuit meter
Formula is calculated, unit function coefficient formula is further improved, further increases the efficiency and accuracy of calculating.
In HVDC transmission system, there is alternating current filter in rectification side, traditional for filtering out unwanted harmonic wave
Unit function coefficient method have ignored influence of the alternating current filter to system line, but in fact, alternating current filter has to circuit
The effect of reactive-load compensation, so as to influence the calculating of capacity of short circuit, should not ignore.
Wherein, S is capacity of trunk, PdFor circuit active power, QfFor circuit reactive power, QEDo not consider to hand over for former circuit
Flow the reactive power of wave filter, QLCThe reactive power compensated for alternating current filter.
The present invention is in conventional rack function coefficient method, it is considered to influence of the alternating current filter to circuit, adds in systems
Enter many tune AC harmonic filters, improve the degree of accuracy of calculating.
As shown in figure 1, disclose a kind of consideration alternating current filter that analysis is synchronously shaken based on this is influenceed on transmission system
Determination unit function coefficient method, including：
(1) adjust AC harmonic filter to be added to rectification side in high voltage direct current converter system by more；
(2) consider the capacity reactive compensation influences for adjusting AC harmonic filter to DC transmission system more；
(3) three-phase obtained by short circuit calculation between new direct current transportation converting plant and generating set on ac bus is short
Road electric current；
(4) according to new short circuit current flow, it is determined that new unit function coefficient, analyzes its value and detection sub-synchronous oscillation
Relation
Many tune AC harmonic filters are added between HVDC transmission system converting plant and generating set, structure is for example attached
Fig. 3, its function be by unwanted current harmonics with switching to power supply.Relative to dull harmonic filter, adjust AC harmonic more
Wave filter can eliminate the harmonic wave of 2 different frequencies simultaneously, you can be equivalent to two dull harmonic filters.
The specific calculation procedure of this modification method is as follows：
(1) unit function coefficient, such as following formula are calculated according to conventional method：
(2) AC harmonic filter each resistance, electric capacity, inductance parameters are adjusted 2 with reference to the accompanying drawings, it may be determined that its impedance is more：
In formula, Z (ω) is the equiva lent impedance that double tunning wave filter produces reactive power compensation part；ω is exchange resonance
Filter resonance frequency；C1, L1The respectively capacitance and inductance value of AC harmonic filter part in series；Ci, LiRespectively hand over
Flow the capacitance and inductance value of harmonic filter parallel connection part；K is that AC harmonic filter can filter out different frequency harmonic wave quantity
(k≥2)。
Circuit load is equivalent to a rated capacity and generating set identical motor, the equivalent of such as accompanying drawing 4 is constituted
Circuit diagram.Again in this equivalent circuit, for convenience of being analyzed, it is assumed that the volume of the motor of load equivalent and generating set to be measured
Constant volume is identical.Typically ignore influence of the impedance to circuit under the conditions of high voltage power transmission, only consider induction reactance present in circuit, from
And obtained such as the equivalent circuit diagram of accompanying drawing 3.AC harmonic filter impedance is adjusted according to more, calculates its short circuit current flow：
(3) generator and motor reference current value are calculated：
Wherein, SBFor the rated capacity of testing generator and equivalent motor；UEFor the rated voltage of equivalent circuit.
(4) withFor reference vector, perunit value is taken to obtain it：
Wherein, Uf(0)For the magnitude of voltage at short dot f, its phase angle is consistent with rated voltage phase angle.
(5) 3 equivalent circuit with reference to the accompanying drawings, seeks electric current under normal work, obtains：
Wherein, P is motor active power, and cos θ are line power factor, and θ is power angle.
(6) perunit value is asked to it
(7) generator transient internal voltage can be asked by operating current, obtained：
Wherein, x1For equivalent generator reactance, x2The equivalent reactance of circuit between short dot and generating set, z is handed over more for adjust
Flow harmonic filter equiva lent impedance.
(8) similarly, motor transient internal voltage can be sought, is obtained：
Wherein, x3For equivalent motor reactance.
(9) after short circuit, each electric current is calculated according to equivalent circuit：
A) the equivalent short circuit current flow of generator side is calculated：
B) the equivalent short circuit current flow in equivalent motor side is calculated：
(10) the equivalent short circuit current flow of the equivalent short circuit current flow of generator side and equivalent motor side is summed, calculates rectification top-cross
Flow busbar short-circuit electric current：
Wherein,For the electric current of circuit between short dot and generator；For generator equivalent electromotive force perunit value；
x1, x2The equivalent reactance of transmission line of electricity respectively between generator equivalent reactance and short dot and generator；Z (ω) is handed over more for adjust
Flow harmonic filter equiva lent impedance；IBFor line current standard value；For the equivalent current between equivalent motor and short dot；For motor equivalent electromotive force；x3For transmission line of electricity equivalent reactance between equivalent motor and short dot；
The method for calculating rectification side ac bus short circuit current flow, obtains direct current transportation in new unit function coefficient formula whole
Three-phase shortcircuit capacity calculation methods on the ac bus of stream station, it is considered to which alternating current filter is idle between rectification side and generating set
The influence to overall capacity of short circuit is compensated, on the direct current transportation converting plant ac bus not include i-th generating set contribution
Three-phase shortcircuit capacity exemplified by：
Wherein, SCi" direct current transportation is influenceed for consideration alternating current filter, the direct current that i-th of generating set is not calculated is defeated
Three-phase shortcircuit capacity on electric system converting plant ac bus,For circuit ac bus rated voltage,To consider that adjust is handed over more
Flow the short circuit current flow of harmonic filter influence.SC"TOTDirect current transportation is influenceed to consider alternating current filter, i-th of hair is calculated
Three-phase shortcircuit capacity on the DC transmission system converting plant ac bus of motor, computational methods same SC "i。
(12) original unit function coefficient calculation formula is improved, obtains new calculation formula, to being in former formula
Number SCiAnd SCTOTIt is improved, it is considered influence of the alternating current filter to circuit：
In formula, UIFi" to consider i-th new effect between generating set and direct current transportation of alternating current filter influence
Coefficient；SHVDCFor the rated capacity (MW) of DC transmission system；SiFor the rated capacity (MVA) of i-th generating set.Wherein
SHVDCAnd SiAll it is known when planning and designing power station, DC transmission engineering.
Claims (4)
1. a kind of determination unit function coefficient method for considering alternating current filter, it is characterised in that：To detection sub-synchronous oscillation feelings
The unit function coefficient method of condition is improved, it is necessary to consider the influence that alternating current filter is produced to D.C. high voltage transmission, is formed
New unit function coefficient formula, specifically includes following steps：
Step 1：Adjust AC harmonic filter to be added to rectification side in high voltage direct current converter system by more；
Step 2：Consider the capacity reactive compensation influences for adjusting AC harmonic filter to DC transmission system more；
Step 3：The three-phase obtained by short circuit calculation between new direct current transportation converting plant and generating set on ac bus is short
Road stops；
Step 4：According to new short circuit current flow, it is determined that new unit function coefficient, analyzes its value and detection sub-synchronous oscillation
Relation.
2. the method according to claim 1 for considering alternating current filter influence, it is characterised in that：In D.C. high voltage transmission system
AC harmonic filter is added between system converting plant and generating set, its function is that unwanted current harmonics is switched into power supply
Ground.Characterized in that, relative to dull harmonic filter, it is adjust AC harmonic filter to eliminate 2 or more than 2 simultaneously more
The harmonic wave of different frequency, you can be equivalent to multiple dull harmonic filters.Each resistance of AC harmonic filter, electricity are adjusted according to more
Appearance, inductance parameters, determine its impedance, then carry out short circuit calculation, it is considered to the reactive-load compensation influence of alternating current filter, calculate short circuit electricity
Stream：
In formula, Z (ω) is the equiva lent impedances for adjusting AC harmonic filter to produce reactive power compensation part more；ω is exchange resonance
Filter resonance frequency；C1, L1The respectively capacitance and inductance value of AC harmonic filter part in series；Ci, LiRespectively hand over
Flow the capacitance and inductance value of harmonic filter parallel connection part；K is that AC harmonic filter can filter out different frequency harmonic wave quantity
(k≥2)。
Circuit load is equivalent to a rated capacity and generating set identical motor, AC harmonic filter is adjusted more according to
Impedance, calculates its short circuit current flow：
Step 1：Calculate the equivalent short circuit current flow of generator side：
Step 2：Calculate the equivalent short circuit current flow in equivalent motor side：
Step 3：Calculate rectification side ac bus short circuit current flow：
Wherein,For the electric current of circuit between short dot and generator；For generator equivalent electromotive force perunit value；x1, x2Point
Not Wei between generator equivalent reactance and short dot and generator transmission line of electricity equivalent reactance；AC harmonic is adjusted for Z (ω) more
Wave filter equiva lent impedance；IBFor line current standard value；For the equivalent current between equivalent motor and short dot；
For motor equivalent electromotive force；x3For transmission line of electricity equivalent reactance between equivalent motor and short dot.
3. calculating the method for rectification side ac bus short circuit current flow according to claim 2, new unit function coefficient formula is obtained
Three-phase shortcircuit capacity calculation methods on middle direct current transportation converting plant ac bus, it is characterized in that：Consider rectification side and generator
Influence of the reactive-load compensation of alternating current filter to overall capacity of short circuit between group, not include the straight of i-th generating set contribution
Exemplified by three-phase shortcircuit capacity on stream transmission of electricity converting plant ac bus：
Wherein, SC "iDirect current transportation is influenceed to consider alternating current filter, the DC power transmission system of i-th of generating set is not calculated
The three-phase shortcircuit capacity united on converting plant ac bus,For circuit ac bus rated voltage,To consider that adjust exchanges humorous more
The short circuit current flow of wave filter influence.SC"TOTDirect current transportation is influenceed to consider alternating current filter, i-th of generator is calculated
DC transmission system converting plant ac bus on three-phase shortcircuit capacity, computational methods same SC "i。
4. according to claims 1 to 3, original unit function coefficient calculation formula is improved, new calculation formula is obtained, its
It is characterized as：To coefficient S C in unit function coefficient formulaiAnd SCTOTIt is improved, it is considered shadow of the alternating current filter to circuit
Ring：
In formula, UIF "iTo consider i-th new function coefficient between generating set and direct current transportation of alternating current filter influence；
SHVDCFor the rated capacity (MW) of DC transmission system；SiFor the rated capacity (MVA) of i-th generating set.Wherein SHVDCAnd Si
All it is known when planning and designing power station, DC transmission engineering.
This formula is only applicable to be connected to the different situation of all generating sets on same bus, now, each unit tool
There are different natural torsion frequencies, the torsional oscillation of each unit does not influence the torsional oscillation of remaining unit.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494717A (en) * | 2018-11-16 | 2019-03-19 | 国网新疆电力有限公司经济技术研究院 | It can avoid the safe capacity of short circuit screening technique and system of subsynchronous resonance risk |
| CN112749486A (en) * | 2020-12-29 | 2021-05-04 | 南方电网科学研究院有限责任公司 | Method and device for batch calculation of unit action coefficients and storage medium |
| CN113433483A (en) * | 2021-06-01 | 2021-09-24 | 南京南瑞继保电气有限公司 | On-line monitoring method and monitoring device for short-circuit current of alternating current system |
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| CN112749486B (en) * | 2020-12-29 | 2023-05-16 | 南方电网科学研究院有限责任公司 | Method, device and storage medium for batch calculation of unit action coefficients |
| CN113433483A (en) * | 2021-06-01 | 2021-09-24 | 南京南瑞继保电气有限公司 | On-line monitoring method and monitoring device for short-circuit current of alternating current system |
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