CN108173264A - A kind of Optimal Configuration Method of fault current limiter - Google Patents
A kind of Optimal Configuration Method of fault current limiter Download PDFInfo
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- CN108173264A CN108173264A CN201711481275.1A CN201711481275A CN108173264A CN 108173264 A CN108173264 A CN 108173264A CN 201711481275 A CN201711481275 A CN 201711481275A CN 108173264 A CN108173264 A CN 108173264A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The invention discloses a kind of Optimal Configuration Methods of fault current limiter, utilize multi-infeed HVDC interaction factor, judge commutation failure high risk zone simultaneously, when SRFCL devices are configured, calculate the average electrical distance between each DC converter station in current limliting nodal distance while commutation failure high risk zone, and then determine current limliting node priority, avoid extensive search, inhibitions of the SRFCL to direct-current commutation failure is considered simultaneously, so as to fulfill the SRFCL configuration schemes taken into account limiting short-circuit current with inhibit commutation failure.The present invention is conducive to Power System Planning personnel and holds influence of the SRFCL installation configurations to multi-infeed HVDC system commutation failure, intuitively determining SRFCL installation regions, index calculating can be with sequencing display in region, it is easily achieved, so as to provide decision support for SRFCL Optimal Configuration Methods in multi-infeed HVDC system.
Description
Technical field
The present invention relates to a kind of Optimal Configuration Methods of fault current limiter, belong to Power System and its Automation technology neck
Domain.
Background technology
For increasingly increased system short-circuit levels of current, fault current limiter due to when it is with normal operation impedance approach
In zero and having no adverse effect to power grid, power grid occurs quickly to increase impedance limit short circuit current during short trouble, so that it is guaranteed that disconnected
The features such as road device reliable disengagement failure circuit, become and study more novel short circuit current-limiting apparatus at present.But due to super-pressure event
The cost for hindering current limiter is sufficiently expensive, and fault current limiter is distributed rationally as research hotspot problem.However, in load center area
Domain, not only short circuit current excessive problem protrude, multi-infeed HVDC is its another notable feature, and commutation failure is as direct current system
One of most common failure of uniting happens occasionally, and the transient stability of ac and dc systems is even influenced when serious.
Current limiter cost, current limitation effect etc. are mainly in view of currently for the target distributed rationally of fault current limiter, it is excellent
Changing configuration method mainly has enumerative technique and various intelligent optimization algorithms etc., but does not consider fault current limiter to direct-current commutation failure
Inhibition.Fault current limiter inhibits short circuit current, the characteristic of raising fault point voltage can be greatly lowered direct current and change
The mutually risk of failure.With the fast development of extra-high voltage alternating current-direct current power grid, transregional direct current conveying capacity is continuously improved, direct current commutation
Stabilization of power grids risk is continuously improved caused by failure.Therefore, the applicability for raising fault current limiter configuration method reduces present more
Enter the commutation failure probability of DC grid, a kind of fault current limiter configuration method for taking into account direct-current commutation failure inhibition has extensive
Application prospect.
Invention content
It is an object of the invention to overcome deficiency of the prior art, a kind of side of distributing rationally of fault current limiter is provided
Method, the consideration of fault current limiter Optimal Configuration Method failure factor is not comprehensive in the prior art for solution, can not inhibit multi-infeed HVDC
Commutation failure, the technical issues of influencing stability of power system.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of fault current limiter is distributed rationally
Method includes the following steps：
Determine the fitting limit of fault current limiter；
It is formed according to current limliting requirement using branch additional method by fault current limiter installation number, installation site and installed capacity
The fault current limiter configuration scene of combination definition；
Scene is configured according to the fault current limiter of generation, considers inhibition of the fault current limiter to direct-current commutation failure,
Filter out fault current limiter allocation optimum scheme to be selected；
To fault current limiter, allocation optimum scheme to be selected accounts for the electricity net safety stable of straight-flow system and checks, and will meet
Consider allocation optimum scheme of the fault current limiter configuration scene of Power Network Transient Stability constraint as fault current limiter.
Determine that the specific method of the fitting limit of fault current limiter is as follows：
Load flow calculation is carried out to straight-flow system, when obtaining specifying the short circuit current of examination node during straight-flow system normal operation
Voltage magnitude and the size of current of phase angle and each branch of straight-flow system；
The short circuit current that three phase short circuit fault is carried out to 220kV and above power grid scans, and determines to need to limit
Whole nodes of short circuit current form ancestor node matrix, and determine current limliting target；
Interaction factor between solution multi-infeed HVDC, according to Practical Project threshold value, determines commutation failure high risk area
The fitting limit in domain, i.e. fault current limiter.
The specific method for forming fault current limiter configuration scene using branch additional method according to current limliting requirement is as follows：
Calculate current limliting in need nodal distance, while calculate in commutation failure high risk zone between each DC converter station
Average electrical distance, and sort from small to large by average electrical distance；
According to the electrical distance threshold value of setting, candidate current limliting node is chosen, forms candidate current limliting sequence node；
According to the entry condition of fault current limiter, the fault current limiter that cannot reliably start installation branch is excluded, it will be candidate
Candidate branch of the remaining branch as installation fault current limiter in current limliting node；
According to the priority of candidate current limliting sequence node, using branch additional method, require generation corresponding each with reference to current limliting
Branch installation site and corresponding fault current limiter installed capacity are possible under candidate current limliting node, defines each configuration feelings
Condition is a kind of scene, generates different fault current limiter configuration scenes.
The specific method for generating fault current limiter configuration scene is as follows：
6-1) according to the priority of candidate current limliting sequence node, the candidate current limliting node to rank the first is chosen；
6-2) using branch additional method, the needs that each branch road to be selected of the candidate current limliting node meets current limliting requirement are obtained
The fault current limiter impedance value of installation forms multiple fault current limiter configuration scenes；
The range of config failure current limiter impedance value in each scene 6-3) is examined whether between 1~30 ohm, if so,
Perform step 6-4)；If not, rejecting scene of the fault current limiter impedance value configuration more than 30 ohm, then perform step 6-4)；
6-4) each fault current limiter configuration scene after screening is applied in power grid, is re-started successively all specified
Short circuit current examination node calculation of short-circuit current；
6-5) examine whether the candidate current limliting node under current scene has all met current limliting requirement：If it is satisfied, then it holds
Row step 6-6)；If conditions are not met, the candidate current limliting sequence node of update, is transferred to step 6-1), to having scene add more
Newly；
6-6) form all fault current limiter configuration scenes.
The screening technique of allocation optimum scheme to be selected is as follows：
Scene is configured according to the fault current limiter of generation, calculates fault current limiter installation cost under each configuration scene successively
And the direct-current commutation failure off-energy factor；
If cost ratio Cx＞ CT, then the minimum scene of cost is paid the utmost attention to, otherwise pays the utmost attention to direct-current commutation failure loss
To be selected allocation optimum scheme of the scene of energy factors minimum as fault current limiter,
Wherein：f1,f2...fcFor the cost under various scenes, is number of scenes, C is configured in cMAXFor maximum cost, CMINFor
Least cost, CxFor maximum cost and the ratio of minimum cost, CTFor cost disparities threshold value.
The circular of the direct-current commutation failure off-energy factor is as follows：
Each direct-current commutation failure weight coefficient w 7-1) is solved according to formula (2)i：
Wherein：PiFor direct current DCiTransmission power；PkFor direct current DCkTransimission power；It is current conversion station i to current conversion station k's
Interaction factor；N represents direct current item number and current conversion station number；
7-2) with wasted power, commutation failure duration and the commutation failure weight of each direct current that commutation failure occurs
The sum of products characterization failure current limiter of coefficient defines direct-current commutation failure lost work to the inhibition of direct-current commutation failure
Rate factor ECFAs shown in formula (3)：
Wherein, Δ PilossFor i-th DC loss power during commutation failure, Δ tiFor the commutation failure duration.
Compared with prior art, the advantageous effect that is reached of the present invention is：Under conditions of current limliting requirement has been met, amount
The inhibition degree of fault current limiter during change commutation failure is conducive to Power System Planning operations staff and formulates failure limit
When flowing device configuration scheme while considering that short circuit current inhibits, fault current limiter is taken into account to inhibiting direct-current commutation failure
It influences, to meet power grid multiple target safe and stable operation requirement, so as to generate the economic benefit of bigger.
Description of the drawings
Fig. 1 is the flow chart of the method for the present invention；
Fig. 2 is the detail flowchart of step 6 in Fig. 1；
Fig. 3 selects schematic diagram for fault current limiter candidate branch；
Schematic diagram of a scenario is configured for fault current limiter in Fig. 4.
Specific embodiment
The present invention provides a kind of Optimal Configuration Methods of fault current limiter, specifically provide a kind of series resonance-type failure
The side of distributing rationally of current limiter (Series Ressonant Type Fault Current Limiter, hereinafter referred to as SRFCL)
Method, including：It determines the fitting limit of SRFCL, is formed according to current limliting requirement using branch additional method by SRFCL installation numbers, peace
Holding position and the configuration scene of installed capacity generation consider that SRFCL to the inhibition of direct-current commutation failure, screens SRFCL's
Allocation optimum scheme to be selected carries out allocation optimum scheme to be selected Power Network Transient Stability check, finally determining SRFCL allocation optimums
Scheme.The present invention is conducive to considering short circuit electricity when Power System Planning operations staff formulates fault current limiter configuration scheme
While stream inhibits, influence of the fault current limiter to inhibition direct-current commutation failure is taken into account, to meet power grid multiple target safety and stability
Service requirement, so as to generate the economic benefit of bigger.
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and be not intended to limit the protection scope of the present invention and limit the scope of the invention.
As shown in Figure 1, being the flow chart of the present invention, specifically comprise the following steps：
It determines the fitting limit of fault current limiter, specifically comprises the following steps：
Step 1：Load flow calculation is carried out to straight-flow system, obtains specifying the electricity during examination node short circuit during power grid normal operation
The size of current of pressure amplitude value and phase angle and each branch of straight-flow system；
Step 2：The short circuit current that three phase short circuit fault is carried out to 220kV and above power grid scans, and determines to need
Whole nodes of limiting short-circuit current are wanted, form ancestor node matrix, and determine current limliting target (such as：Make given voltage grade institute
There is node short circuit current to be less than circuit breaker interrupting capacity etc., current limliting target can be formulated according to specific requirements).
Step 3：Interaction factor between solution multi-infeed HVDC, according to Practical Project threshold value, determines commutation failure height
The fitting limit of risk zones, i.e. fault current limiter, is specifically divided into following steps：
If share n direct current DC1,DC2,L DCn, current conversion station j is obtained to any current conversion station i using trend Jacobin matrix
Between mutual impedance Zji, current conversion station j self-impedances Zjj, wherein, j, i ∈ { 1, n }, the more feed-ins being obtained between current conversion station j and current conversion station i are handed over
The interaction factor：
It is calculatedDirect current near region be while commutation failure high risk zone, will be in this regional extent
SRFCL is installed.
It is formed according to current limliting requirement using branch additional method by fault current limiter installation number, installation site and installed capacity
The fault current limiter configuration scene of combination definition, specifically comprises the following steps：
Step 4：Calculate current limliting in need nodal distance, while calculate each direct current in commutation failure high risk zone and change
Average electrical distance between stream station, and sort from small to large by average electrical distance；According to the electrical distance threshold value of setting, choosing
Candidate current limliting node is taken, forms candidate current limliting sequence node；
Step 5：According to the entry condition of fault current limiter, the fault current limiter that cannot reliably start installation branch is excluded,
Using remaining branch in candidate current limliting node as the candidate branch of installation fault current limiter；
Step 6：According to the priority of candidate current limliting sequence node, using branch additional method, with reference to current limliting requirement generation pair
It answers and is possible to branch installation site and corresponding fault current limiter installed capacity under each candidate current limliting node, define each
Configuring condition is a kind of scene, generates different fault current limiter configuration scenes.
As shown in Fig. 2, for every day in period Δ T, step 6-1 is performed) to 6-6).
6-1) according to the priority of candidate current limliting sequence node, the candidate current limliting node to rank the first is chosen；
6-2) using branch additional method, the needs that each branch road to be selected of the candidate current limliting node meets current limliting requirement are obtained
The fault current limiter impedance value of installation forms the one-to-one fault current limiter configuration scene of multiple node-branch-impedances；
The range of config failure current limiter impedance value in each scene 6-3) is examined whether between 1~30 ohm, if so,
Perform step 6-4)；If not, rejecting scene of the fault current limiter impedance value configuration more than 30 ohm, then perform step 6-4).
6-4) each fault current limiter configuration scene after screening is applied in power grid, is re-started successively all specified
Short circuit current examination node calculation of short-circuit current；
6-5) examine whether the candidate current limliting node under current scene has all met current limliting requirement：If it is satisfied, then it holds
Row step 6-6)；If conditions are not met, the candidate current limliting sequence node of update, is transferred to step 6-1), to having scene add more
Newly；
6-6) form all fault current limiter configuration scenes.
Scene is configured according to the fault current limiter of generation, considers inhibition of the fault current limiter to direct-current commutation failure,
The allocation optimum scheme to be selected of fault current limiter is filtered out, is as follows：
Step 7：Scene is configured according to the fault current limiter of generation, calculates fault current limiter under each configuration scene successively and pacifies
Dress up this and the direct-current commutation failure off-energy factor；
The circular of the direct-current commutation failure off-energy factor is as follows：
Each direct-current commutation failure weight coefficient w 7-1) is solved according to formula (1)i：
Wherein：PiFor direct current DCiTransmission power；PkFor direct current DCkTransimission power；It is current conversion station i to current conversion station k's
Interaction factor；N represents direct current item number and current conversion station number；
7-2) with wasted power, commutation failure duration and the commutation failure weight of each direct current that commutation failure occurs
The sum of products characterization failure current limiter of coefficient defines direct-current commutation failure lost work to the inhibition of direct-current commutation failure
Rate factor ECFAs shown in formula (2)：
Wherein, Δ PilossFor i-th DC loss power during commutation failure, Δ tiFor the commutation failure duration.
Installation cost is calculated as follows：
Wherein, NFCLTo install the quantity of SRFCL；ZFCL(k) it is k-th of SRFCL impedance value；G1 is the quantity of SRFCL；g2
The weights of impedance are always installed for SRFCL.
Step 8：If cost ratio Cx＞ CT, then the minimum scene of cost is paid the utmost attention to；Otherwise direct current commutation mistake is paid the utmost attention to
Lose to be selected allocation optimum scheme of the scene as fault current limiter of off-energy factor minimum；
Wherein f1,f2...fcFor the cost under various scenes, c is configuration number of scenes.CMAXFor maximum cost, CMINFor most
Low cost, CxFor maximum cost and the ratio of minimum cost, CTFor cost disparities threshold value, C in common engineeringTTake 10~20.
Transient stability check refers to the check of N-1 stability, if meeting N-1 stability requirements, the installation position of SRFCL at this time
Put, installation number and impedance value are then allocation optimum scheme, if being unsatisfactory for N-1 stability requirements, return to step 8), successively
Selection subsequent scenario is checked, until find the scene for meeting N-1 stability requirements, then the installation of the SRFCL under the scene
Position, installation number and impedance value are the fault current limiter allocation optimum scheme for considering to inhibit multi-infeed HVDC commutation failure.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of Optimal Configuration Method of fault current limiter, which is characterized in that include the following steps：
Determine the fitting limit of fault current limiter；
It is formed using branch additional method according to current limliting requirement and is combined by fault current limiter installation number, installation site and installed capacity
The fault current limiter configuration scene of definition；
Scene is configured according to the fault current limiter of generation, considers inhibition of the fault current limiter to direct-current commutation failure, screening
The current limiter that is out of order allocation optimum scheme to be selected；
To fault current limiter, allocation optimum scheme to be selected accounts for the electricity net safety stable of straight-flow system and checks, and considers meeting
Allocation optimum scheme of the fault current limiter configuration scene of Power Network Transient Stability constraint as fault current limiter.
2. the Optimal Configuration Method of fault current limiter according to claim 1, which is characterized in that determine fault current limiter
The specific method of fitting limit is as follows：
Load flow calculation is carried out to straight-flow system, obtains specifying the electricity during short circuit current of examination node during straight-flow system normal operation
The size of current of pressure amplitude value and phase angle and each branch of straight-flow system；
The short circuit current that three phase short circuit fault is carried out to 220kV and above power grid scans, and determines to need to limit short circuit
Whole nodes of electric current form ancestor node matrix, and determine current limliting target；
Interaction factor between solution multi-infeed HVDC, according to Practical Project threshold value, determines commutation failure high risk zone, i.e.,
The fitting limit of fault current limiter.
3. the Optimal Configuration Method of fault current limiter according to claim 2, which is characterized in that require to utilize according to current limliting
The specific method that branch additional method forms fault current limiter configuration scene is as follows：
The nodal distance of institute's current limliting in need is calculated, while calculates in commutation failure high risk zone putting down between each DC converter station
Equal electrical distance, and sort from small to large by average electrical distance；
According to the electrical distance threshold value of setting, candidate current limliting node is chosen, forms candidate current limliting sequence node；
According to the entry condition of fault current limiter, the fault current limiter that cannot reliably start installation branch is excluded, by candidate current limliting
Candidate branch of the remaining branch as installation fault current limiter in node；
According to the priority of candidate current limliting sequence node, using branch additional method, require generation corresponding each candidate with reference to current limliting
Branch installation site and corresponding fault current limiter installed capacity are possible under current limliting node, defining each configuring condition is
A kind of scene generates different fault current limiter configuration scenes.
4. the Optimal Configuration Method of fault current limiter according to claim 3, which is characterized in that generation fault current limiter is matched
The specific method for putting scene is as follows：
6-1) according to the priority of candidate current limliting sequence node, the candidate current limliting node to rank the first is chosen；
6-2) using branch additional method, the needs that each branch road to be selected of the candidate current limliting node meets current limliting requirement are obtained and install
Fault current limiter impedance value, form multiple fault current limiter configuration scenes；
The range of config failure current limiter impedance value in each scene 6-3) is examined whether between 1~30 ohm, if so, performing
Step 6-4)；If not, rejecting scene of the fault current limiter impedance value configuration more than 30 ohm, then perform step 6-4)；
6-4) by after screening each fault current limiter configuration scene be applied to power grid in, re-start successively it is all specify it is short
The calculation of short-circuit current of road electric current examination node；
6-5) examine whether the candidate current limliting node under current scene has all met current limliting requirement：If it is satisfied, then perform step
Rapid 6-6)；If conditions are not met, the candidate current limliting sequence node of update, is transferred to step 6-1), carry out additional update to having scene；
6-6) form all fault current limiter configuration scenes.
5. the Optimal Configuration Method of fault current limiter according to claim 1, which is characterized in that allocation optimum scheme to be selected
Screening technique it is as follows：
According to generation fault current limiter be configured scene, calculate successively it is each configuration scene under fault current limiter installation cost and
The direct-current commutation failure off-energy factor；
If cost ratio Cx＞ CT, then the minimum scene of cost is paid the utmost attention to, otherwise pays the utmost attention to direct-current commutation failure off-energy
To be selected allocation optimum scheme of the scene of factor minimum as fault current limiter,
Wherein：f1,f2...fcFor the cost under various scenes, is number of scenes, C is configured in cMAXFor maximum cost, CMINIt is minimum
Cost, CxFor maximum cost and the ratio of minimum cost, CTFor cost disparities threshold value.
6. the Optimal Configuration Method of fault current limiter according to claim 5, which is characterized in that the direct-current commutation failure
The circular of the off-energy factor is as follows：
Each direct-current commutation failure weight coefficient w 7-1) is solved according to formula (2)i：
Wherein：PiFor direct current DCiTransmission power；PkFor direct current DCkTransimission power；The interaction of current conversion station k is made for current conversion station i
Use the factor；N represents direct current item number and current conversion station number；
7-2) with wasted power, commutation failure duration and the commutation failure weight coefficient of each direct current that commutation failure occurs
Sum of products characterization failure current limiter to the inhibition of direct-current commutation failure, that is, define direct-current commutation failure wasted power because
Sub- ECFAs shown in formula (3)：
Wherein, Δ PilossFor i-th DC loss power during commutation failure, Δ tiFor the commutation failure duration.
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| CN108879754A (en) * | 2018-07-26 | 2018-11-23 | 清华大学 | Reduce the FCL Optimal Configuration Method and system of secondary commutation failure risk |
| CN109617033A (en) * | 2019-01-08 | 2019-04-12 | 中国能源建设集团广东省电力设计研究院有限公司 | Distribution system current-limiting method and device |
| CN109687417A (en) * | 2019-01-28 | 2019-04-26 | 国电南瑞科技股份有限公司 | A kind of fault current limiter configuration method |
| CN109888755A (en) * | 2019-03-22 | 2019-06-14 | 广东电网有限责任公司 | A kind of power grid superconductive current limiter optimal configuration method, device and equipment |
| CN110176755A (en) * | 2019-06-18 | 2019-08-27 | 广州供电局有限公司 | A kind of fault current limiter configuration method and device |
| CN110336266A (en) * | 2019-05-07 | 2019-10-15 | 山东大学 | The direct current of alternating current-direct current mixed connection receiving end power grid divides group's planing method |
| CN110504707A (en) * | 2019-07-29 | 2019-11-26 | 深圳供电局有限公司 | Method and device for evaluating voltage transient stability level of multi-direct-current feed-in power grid |
| CN111884206A (en) * | 2020-07-15 | 2020-11-03 | 山东大学 | Key line impedance adjusting method and system for inhibiting multi-direct-current commutation failure linkage |
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| CN108879754A (en) * | 2018-07-26 | 2018-11-23 | 清华大学 | Reduce the FCL Optimal Configuration Method and system of secondary commutation failure risk |
| CN108879754B (en) * | 2018-07-26 | 2020-05-01 | 清华大学 | FCL optimal configuration method and system for reducing risk of secondary commutation failure |
| CN109617033A (en) * | 2019-01-08 | 2019-04-12 | 中国能源建设集团广东省电力设计研究院有限公司 | Distribution system current-limiting method and device |
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| CN109687417A (en) * | 2019-01-28 | 2019-04-26 | 国电南瑞科技股份有限公司 | A kind of fault current limiter configuration method |
| CN109888755A (en) * | 2019-03-22 | 2019-06-14 | 广东电网有限责任公司 | A kind of power grid superconductive current limiter optimal configuration method, device and equipment |
| CN110336266B (en) * | 2019-05-07 | 2020-09-04 | 山东大学 | Direct-current grouping planning method for alternating-current and direct-current series-parallel receiving-end power grid |
| CN110336266A (en) * | 2019-05-07 | 2019-10-15 | 山东大学 | The direct current of alternating current-direct current mixed connection receiving end power grid divides group's planing method |
| CN110176755A (en) * | 2019-06-18 | 2019-08-27 | 广州供电局有限公司 | A kind of fault current limiter configuration method and device |
| CN110176755B (en) * | 2019-06-18 | 2021-03-02 | 广州供电局有限公司 | Fault current limiter configuration method and device |
| CN110504707A (en) * | 2019-07-29 | 2019-11-26 | 深圳供电局有限公司 | Method and device for evaluating voltage transient stability level of multi-direct-current feed-in power grid |
| CN110504707B (en) * | 2019-07-29 | 2021-05-04 | 深圳供电局有限公司 | Method and device for evaluating voltage transient stability level of multi-direct-current feed-in power grid |
| CN111884206A (en) * | 2020-07-15 | 2020-11-03 | 山东大学 | Key line impedance adjusting method and system for inhibiting multi-direct-current commutation failure linkage |
| CN112751338A (en) * | 2020-12-29 | 2021-05-04 | 广东电网有限责任公司电力调度控制中心 | Reactance arrangement method for limiting short-circuit current of power grid and related device |
| CN113890068A (en) * | 2021-10-31 | 2022-01-04 | 贵州电网有限责任公司 | Three-phase commutation method based on power electronic technology |
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