CN109861270A - A kind of newly-increased VSC-HVDC drop point preferred method of multi-infeed HVDC system - Google Patents
A kind of newly-increased VSC-HVDC drop point preferred method of multi-infeed HVDC system Download PDFInfo
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Abstract
The invention belongs to Power System Planning fields, more particularly to a kind of newly-increased VSC-HVDC drop point preferred method of multi-infeed HVDC system, the following steps are included: step 1, direct current drop point assessment indicator system is constructed, the assessment indicator system further comprises more feed-in short-circuit ratioes, direct-current commutation failure risk and receiving-end system unstability risk three norms；Step 2, the stress survey of each index is calculated, realizes and standardization processing is carried out to indices, eliminate the difference in the rank and dimension of different evaluation indexes；Step 3, an overall target is converted by multiple indexs using weigthed sums approach to evaluate, select optimal case.The drop point preferred method is by three norms from each direct current drop point of multiple angle thoroughly evaluatings to the stability influence degree of ac and dc systems, it is calculated using subordinate degree and eliminates dimension and level difference, finally it is unified into an overall target, avoid the optimal case disunity problem of multi objective, appraisal procedure is simple, easy to accomplish.
Description
Technical field
The invention belongs to the newly-increased VSC-HVDC of Power System Planning field more particularly to a kind of multi-infeed HVDC system to fall
Point preferred method.
Background technique
China natural resources distribution is serious unbalanced, and high voltage direct current (HVDC) transmission of electricity have conveying distance farther out, capacity it is larger,
The advantages such as flexible adjustment and reliability height, so, it is effective that configuration is optimized to resource using high-voltage dc transmission electric energy.With
The large-scale application of continuous development and the direct current transportation of power grid, necessarily will appear multiple-circuit line access a receiving end AC system
The phenomenon that, China East China, Central China and south electric network have all constituted more feed-in receiving-end systems.Multiple-circuit line feed-in makes receiving end
The structure of system is more complicated, aggravates the safety and stability problem of system.It is defeated compared to based on line commutation inverter customary DC
Electric (Line Commutated Converter based High Voltage Direct Current, LCC-HVDC), is based on
Flexible DC transmission (the Voltage Source Converter based High Voltage Direct of voltage source converter
Current, VSC-HVDC) have achievable decoupled active and reactive control, can power and not deposit to weak pattern system or passive system
In the advantage of commutation failure problem, in recent years as the main direct current type for considering access multi-infeed systems.And it selects suitably
Direct current drop point can weaken these adverse effects, improve the stability of receiving-end system.Optimal selection in view of direct current drop point is presented more
Entering direct current access system stability problem improves highlighting for importance, and domestic and foreign scholars expand correlative study to this.But
Existing direct current drop point preferred method can not be after assessing direct current access system to the dimension and depth of receiving-end system stability influence
All take into account.
Summary of the invention
The purpose of the present invention is to propose to a kind of newly-increased VSC-HVDC drop point preferred method of multi-infeed HVDC system, comprehensive
After considering influence of the newly-increased direct current to AC system stability and to existing direct current, more feed-in short-circuit ratioes are established
(Multi-infeed Short Circuit Ratio, MISCR), direct-current commutation failure risk and receiving-end system unstability risk
For indicator evaluation system, after carrying out standardization processing to indices, the overall target obtained according to weigthed sums approach, from standby
It selects and selects optimal drop point in scheme.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of newly-increased VSC- of multi-infeed HVDC system
HVDC drop point preferred method, comprising the following steps:
Step 1, direct current drop point assessment indicator system is constructed, mark system can evaluate each direct current drop point to friendship from multiple angles
The stability influence degree of direct current system, the assessment indicator system further comprise more feed-in short-circuit ratioes, direct current commutation mistake
Lose risk and receiving-end system unstability risk three norms；
More feed-in short-circuit ratioes (MISCR) determine index and reflect receiving end AC network to the enabling capabilities of direct current and direct current
Reciprocation, can be used for assess have a plurality of direct current feed-in receiving-end system voltage stability, expression are as follows:(1) in formula, MiIt is short for the corresponding more feed-ins of direct current i
Road ratio is writing a Chinese character in simplified form for MISCR；SACiThe capacity of short circuit of bus at receiving-end system is accessed for direct current i；Pdci、PdcjRespectively direct current i,
The rated active power of direct current j, MIIFj,iThe factor that influences each other between a plurality of direct current, when direct current i access point busbar voltage is sent out
Raw Δ UiVariation when, will lead to direct current j access point busbar voltage changes delta Uj, and MIIFj,iIt may be defined as Δ UjWith Δ Ui's
Ratio.
Direct-current commutation failure risk indicator is for evaluating newly-increased direct current to the stability influence of existing direct current, by causing more times
The route three phase short circuit fault possibility and seriousness of the AC system of direct-current commutation failure form, and likelihood of failure is by that can generate
The three phase short circuit fault number of commutation failure and the ratio of three phase short circuit fault sum, by different access scheme three-phase shortcircuit sums one
It is fixed, in order to which intuitive indicates possibility with the three-phase shortcircuit number that can generate commutation failure.Seriousness is i.e. with commutation failure simultaneously
Return number to indicate.Therefore, direct-current commutation failure risk indicator is represented by,
(2) in formula, DiIndicate direct current synchronizing point
The direct-current commutation failure risk indicator value of i, it is smaller to illustrate that scheme is better；J is caused to return direct current under i-th kind of direct current synchronizing point same
When commutation failure AC system 3 phase short trouble numbers.
Receiving-end system unstability risk indicator can reflect influence of the newly-increased direct current to AC system stability, by initiation receiving end
All kinds of likelihood of failure of the route of the AC system of system unstability and seriousness composition, failure choose alternating current circuit three-phase N-1, N-
Switch single tripping is representative in switch single tripping and route three-phase permanent fault in the single-phase permanent fault of 2 failures, route.Therefore
Hinder possibility by all kinds of short trouble numbers of unstability and the ratio of all kinds of failure sums can be generated, by all kinds of events of different access schemes
Barrier sum is certain, in order to which intuitive indicates possibility with all kinds of number of faults of energy generation system unstability.Seriousness is according to failure
It may be prescribed as N-1 and single tripping forever turn to 1 grade of severity, N-2 failure is 2 grades, and three trippings forever are 3 grades.Therefore, receiving end system
System unstability risk indicator is represented by,(3) in formula, AiIndicate that direct current is fallen
The receiving-end system unstability risk indicator value of point scheme i, it is smaller to illustrate that scheme is better；What is indicated is led under i-th kind of synchronizing point
The alternating current circuit three-phase N-1 number of faults of receiving-end system unstability is caused,What is indicated is to lead to receiving-end system under i-th kind of synchronizing point
The alternating current circuit three-phase N-2 number of faults of unstability,What is indicated is the route list for leading to receiving-end system unstability under i-th kind of synchronizing point
Yongzhong's switch single tripping number of faults,What is indicated is three Yongzhong of route for leading to receiving-end system unstability under i-th kind of synchronizing point
The number of faults of switch single tripping.
Step 2, it using the stress survey for calculating each index, realizes and standardization processing is carried out to indices, eliminate not
Difference in the rank and dimension of same evaluation index.
Evaluation index has more bigger more excellent type and smaller more excellent type, and more feed-in short-circuit ratioes belong to more bigger more excellent type index, direct current
Commutation failure risk and receiving-end system unstability risk belong to smaller more excellent type index.For more bigger more excellent type evaluation index,
Stress survey may be expressed as:For smaller more excellent type evaluation index, stress survey be may be expressed as:(4) and in (5) formula, rijIt is alternative j after standardization for the stress survey of index i；
ximax、ximinThe respectively maximum value of evaluation index i and minimum value ximax=max (xi1,xi2,…xin)、ximin=min (xi1,
xi2,…xin)。
Step 3, it converts an overall target for multiple indexs using weigthed sums approach to evaluate, conversion formula ri
=w1ri1+w2ri2+w3ri3(6), in (6) formula, w1、w2、w3For the weighting coefficient of each index, the weight of index is represented, needs to meet
w1+w2+w3=1 constraint.Three index weights that this patent proposes are consistent, thereforeComprehensive index value
It is bigger, show that scheme is better.
Beneficial effects of the present invention:
(1) evaluation index clear concept proposed in this paper, the comprehensive influence for considering newly-increased direct current access, more feed-ins are short
Road considers newly-increased direct current to the reciprocation direct current, direct-current commutation failure risk and receiving-end system unstability risk than index
Index, which had both considered newly-increased direct current, influences existing stability, it is contemplated that the influence of the stability to AC system；
(2) by the stress survey of each index of calculating, the difference in the rank and dimension of different evaluation indexes is eliminated,
Convenient for evaluation；
(3) multiple indexs are unified into an overall target using weigthed sums approach, avoid multiple metrics evaluations not
It is unified, it causes accurately to choose the best alternatives；
(4) appraisal procedure is simple, realizes and is easy, and the selection for increasing direct current access point newly for multi-infeed HVDC system provides effectively
With reference to.
Detailed description of the invention
Fig. 1 is that one embodiment of the invention increases VSC-HVDC direct current drop point assessment indicator system newly；
Specific embodiment
Embodiments of the present invention are described in detail with reference to the accompanying drawing.
Examples of the embodiments are shown in the accompanying drawings, and in which the same or similar labels are throughly indicated identical or classes
As element or element with the same or similar functions.The embodiments described below with reference to the accompanying drawings are exemplary, only
It is used to explain the present invention, and is not construed as limiting the claims.
Following disclosure provides many different embodiments or example is used to realize different structure of the invention.For letter
Change disclosure of the invention, hereinafter the component of specific examples and setting are described.They are merely examples, and purpose is not
It is to limit the present invention.In addition, the present invention can in different examples repeat reference numerals and/or letter.This repetition be for
Simplified and clear purpose, itself do not indicate discussed various embodiments and/or be arranged between relationship.In addition, this hair
It is bright provide the example of various specific techniques and material, but those of ordinary skill in the art may be aware that other techniques
The use of applicability and/or other materials.In addition, structure of the fisrt feature described below in the "upper" of second feature can be with
Be formed as the embodiment directly contacted including the first and second features, also may include that other feature is formed in first and second
Embodiment between feature, such first and second feature may not be direct contact.
In description of the invention, it should be noted that unless otherwise specified and limited, term " connected " " connection " should be done extensively
Reason and good sense solution, for example, it may be mechanical connection or electrical connection, the connection being also possible to inside two elements can be directly connected,
It can also manage as the case may be indirectly connected through an intermediary, for those of ordinary skill in the related art
Solve the concrete meaning of above-mentioned term.
The present embodiment realizes that a kind of Asynchronous Interconnection sending for coping with DC Line Fault is urgent using following technical scheme
Control method, comprising the following steps:
The technical solution adopted by the present invention is that: a kind of newly-increased VSC-HVDC drop point preferred method of multi-infeed HVDC system,
The following steps are included:
Step 1, direct current drop point assessment indicator system is constructed, mark system can evaluate each direct current drop point to friendship from multiple angles
The stability influence degree of direct current system, the assessment indicator system further comprise more feed-in short-circuit ratioes, direct current commutation mistake
Risk and receiving-end system unstability risk three norms are lost, as shown in Figure 1；
The short-circuit ratio of feed-in more than step 1.1 (MISCR) determine index reflect receiving end AC network to the enabling capabilities of direct current with
And the reciprocation between direct current, it can be used for assessing the voltage stability for the receiving-end system for having a plurality of direct current feed-in, expression are as follows:It (1) is that the corresponding more feed-ins of direct current i are short in formula
Road ratio is writing a Chinese character in simplified form for MISCR；SACiThe capacity of short circuit of bus at receiving-end system is accessed for direct current i；Pdci、PdcjRespectively direct current i,
The rated active power of direct current j, MIIFj,iThe factor that influences each other between a plurality of direct current, when direct current i access point busbar voltage is sent out
Raw Δ UiVariation when, will lead to direct current j access point busbar voltage changes delta Uj, and MIIFj,iIt may be defined as Δ UjWith Δ Ui's
Ratio.
Step 1.2 direct-current commutation failure risk indicator for evaluating newly-increased direct current to the stability influence of existing direct current, by
Cause the route three phase short circuit fault possibility and seriousness composition of the AC system of multiple-circuit line commutation failure, likelihood of failure
It is short by different access scheme three-phases by the three phase short circuit fault number of commutation failure and the ratio of three phase short circuit fault sum can be generated
Road sum is certain, in order to which intuitive indicates possibility with the three-phase shortcircuit number that can generate commutation failure.Seriousness is i.e. with simultaneously
Commutation failure returns number to indicate.Therefore, direct-current commutation failure risk indicator is represented by,
(2) in formula, DiIndicate direct current synchronizing point
The direct-current commutation failure risk indicator value of i, it is smaller to illustrate that scheme is better；J is caused to return direct current under i-th kind of direct current synchronizing point same
When commutation failure AC system 3 phase short trouble numbers.
Step 1.3 receiving-end system unstability risk indicator can reflect influence of the newly-increased direct current to AC system stability, by
All kinds of likelihood of failure of route and seriousness composition, failure for causing the AC system of receiving-end system unstability choose alternating current circuit three
Switch single tripping in switch single tripping and route three-phase permanent fault in the single-phase permanent fault of phase N-1, N-2 failure, route
To represent.Likelihood of failure is by that can generate all kinds of short trouble numbers of unstability and the ratio of all kinds of failure sums, by different accesses
All kinds of failure sums of scheme are certain, in order to which intuitive indicates possibility with all kinds of number of faults of energy generation system unstability.Seriously
Property may be prescribed as N-1 according to failure and single tripping forever turns to 1 grade of severity, N-2 failure is 2 grades, and three trippings forever are 3 grades.
Therefore, receiving-end system unstability risk indicator is represented by,(3) in formula, Ai
Indicate the receiving-end system unstability risk indicator value of direct current synchronizing point i, it is smaller to illustrate that scheme is better；What is indicated is i-th kind and falls
Lead to the alternating current circuit three-phase N-1 number of faults of receiving-end system unstability under point scheme,What is indicated is led under i-th kind of synchronizing point
The alternating current circuit three-phase N-2 number of faults of receiving-end system unstability is caused,What is indicated is to cause receiving-end system to lose under i-th kind of synchronizing point
Steady route list Yongzhong switch single tripping number of faults,What is indicated is to lead to receiving-end system unstability under i-th kind of synchronizing point
The number of faults of three Yongzhong of route switch single tripping.
Step 2, it using the stress survey for calculating each index, realizes and standardization processing is carried out to indices, eliminate not
Difference in the rank and dimension of same evaluation index.
Evaluation index has more bigger more excellent type and smaller more excellent type, and more feed-in short-circuit ratioes belong to more bigger more excellent type index, direct current
Commutation failure risk and receiving-end system unstability risk belong to smaller more excellent type index.For more bigger more excellent type evaluation index,
Stress survey may be expressed as:For smaller more excellent type evaluation index, stress survey be may be expressed as:(4) and in (5) formula, rijIt is alternative j after standardization for the stress survey of index i；
ximax、ximinThe respectively maximum value of evaluation index i and minimum value ximax=max (xi1,xi2,…xin)、ximin=min (xi1,
xi2,…xin)。
Step 3, it converts an overall target for multiple indexs using weigthed sums approach to evaluate, conversion formula ri
=w1ri1+w2ri2+w3ri3(6), in (6) formula, w1、w2、w3For the weighting coefficient of each index, the weight of index is represented, needs to meet
w1+w2+w3=1 constraint.Three index weights that this patent proposes are consistent, thereforeComprehensive index value
It is bigger, show that scheme is better.
Below by taking a certain receiving-end system for having a plurality of direct current feed-in as an example, it is described in further detail, receiving end power grid is
There are 9 direct current feed-ins, it is new to put into WDD DC engineering, VSC inverter is used for receiving end power grid, send 5000MW power, idle branch
Support ability considers that i.e. 1000MVar accesses to reduce new direct current to system stability by the 20% of direct current receiving end rated capacity
Influence, according to the actual situation and after engineering experience provides several reasonable plans, using the mentioned index system of this patent to its into
After row assessment, best receiving end drop point is selected.
Receiving end network load is concentrated mainly on West northern (FS, YF, ZQ) and these areas East western (DG, HZ, SZ)
Long term power notch is in lasting increase tendency, and direct current drop point region tentatively considers in above-mentioned area.According to this engineering system theory
Card is reported and the research achievement of access system report, and emphasis recommends access system plan to divide following three classes in this paper
Analysis.
A class scheme: the area direct current drop point receiving end power grid western part ZQ:
B class scheme: the area direct current drop point receiving end power grid east HZ
C class scheme: direct current is built jointly with the station ZC alternating current-direct current
Specific step is as follows:
1, building includes the direct current drop point of more feed-in short-circuit ratioes, direct-current commutation failure risk and receiving-end system unstability risk
Assessment indicator system.
1.1 are directed to three kinds of schemes, calculate the effective short-circuit ratio of the more feed-ins of 9 DC inversion stations according to formula (1), are recorded in table 1,
The effective short-circuit ratio of more than 1 feed-in of table
1.2 are directed to three kinds of schemes, and statistics AC system three phase short circuit fault leads to direct-current commutation failure situation, judgment basis
It is when instant of failure change of current busbar voltage drops into 90% or less normal operating value, then it is assumed that the direct current occurs commutation and loses
It loses, calculates direct-current commutation failure risk according to formula (2), be recorded in table 2,
2 direct-current commutation failure value-at-risk of table
1.3 are directed to three kinds of schemes, and counting various fault in ac transmission system leads to receiving end power grid unstability situation, are counted according to formula (3)
Receiving-end system unstability risk is calculated, is recorded in table 3,
3 receiving-end system unstability value-at-risk of table
According to the statistics available each index for obtaining three kinds of schemes of 1.1-1.3 as a result, recording in table 4,
Each scheme index calculated result of table 4
2, the stress survey of each index is calculated, realizes and standardization processing is carried out to indices, eliminate different evaluations
Difference in the rank and dimension of index.More feed-in short-circuit ratioes belong to more bigger more excellent type index, are calculated with formula (4)；Direct current commutation
Risk of failure and receiving-end system unstability risk belong to smaller more excellent type index, are calculated with formula (5).Each scheme after standardization refers to
Scale value records in table 5,
Each scheme of table 5 standardization index value
3, using weigthed sums approach, multiple indexs are unified into an overall target, are calculated according to formula (6), this patent mentions
Three index weights out are consistent, thereforeThe overall target for obtaining various schemes is ri=[0.9786
0.9693 0.9301].According to overall target, option A is preferred plan.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
Although being described in conjunction with the accompanying a specific embodiment of the invention above, those of ordinary skill in the art should
Understand, these are merely examples, various deformation or modification can be made to these embodiments, without departing from original of the invention
Reason and essence.The scope of the present invention is only limited by the claims that follow.
Claims (3)
1. a kind of newly-increased VSC-HVDC drop point preferred method of multi-infeed HVDC system, characterized in that the following steps are included:
Step 1, direct current drop point assessment indicator system is constructed, the assessment indicator system includes that more feed-in short-circuit ratioes, direct current change
Phase risk of failure and receiving-end system unstability risk three norms；
Step 2, the stress survey of each index is calculated, realizes and standardization processing is carried out to indices, eliminate different evaluations
Difference in the rank and dimension of index；
Step 3, using etc. specific gravity weigthed sums approach convert an overall target for multiple indexs and evaluate, select optimal
Scheme.
2. the newly-increased VSC-HVDC drop point preferred method of multi-infeed HVDC system as described in claim 1, characterized in that described
Step 1 specifically includes:
Step 1.1: more feed-in short-circuit ratioes (MISCR) determine index and reflect receiving end AC network to enabling capabilities of direct current and straight
Reciprocation between stream can be used for assessing the voltage stability for the receiving-end system for having a plurality of direct current feed-in, expression are as follows:(1) in formula, MiIt is short for the corresponding more feed-ins of direct current i
Road ratio is writing a Chinese character in simplified form for MISCR；SACiThe capacity of short circuit of bus at receiving-end system is accessed for direct current i；Pdci、PdcjRespectively direct current i,
The rated active power of direct current j, MIIFj,iThe factor that influences each other between a plurality of direct current, when direct current i access point busbar voltage is sent out
Raw Δ UiVariation when, will lead to direct current j access point busbar voltage changes delta Uj, and MIIFj,iIt may be defined as Δ UjWith Δ Ui's
Ratio；
Step 1.2: direct-current commutation failure risk indicator is for evaluating newly-increased direct current to the stability influence of existing direct current, by causing
The route three phase short circuit fault possibility and seriousness of the AC system of multiple-circuit line commutation failure form, and likelihood of failure is by energy
The three phase short circuit fault number of commutation failure and the ratio of three phase short circuit fault sum are generated, it is total by different access scheme three-phase shortcircuits
Number is certain, in order to which intuitive indicates possibility with the three-phase shortcircuit number that can generate commutation failure；Seriousness is i.e. with commutation simultaneously
Failure returns number to indicate；Therefore, direct-current commutation failure risk indicator is represented by,
(2) in formula, DiIndicate that direct current synchronizing point i's is straight
Commutation failure risk indicator value is flowed, it is smaller to illustrate that scheme is better；Cause j to return direct current under i-th kind of direct current synchronizing point while changing
Mutually 3 phase short trouble numbers of the AC system of failure；
Step 1.3: receiving-end system unstability risk indicator can reflect influence of the newly-increased direct current to AC system stability, by causing
All kinds of likelihood of failure of the route of the AC system of receiving-end system unstability and seriousness composition, failure choose alternating current circuit three-phase N-
1, switch single tripping is generation in switch single tripping and route three-phase permanent fault in the single-phase permanent fault of N-2 failure, route
Table；Likelihood of failure is by that can generate all kinds of short trouble numbers of unstability and the ratio of all kinds of failure sums, by different access schemes
All kinds of failure sums are certain, in order to which intuitive indicates possibility with all kinds of number of faults of energy generation system unstability；Seriousness is pressed
It may be prescribed as N-1 according to failure and single tripping forever turn to 1 grade of severity, N-2 failure is 2 grades, and three trippings forever are 3 grades；Therefore,
Receiving-end system unstability risk indicator is represented by,(3) in formula, AiIt indicates
The receiving-end system unstability risk indicator value of direct current synchronizing point i, it is smaller to illustrate that scheme is better；What is indicated is i-th kind of drop point side
Lead to the alternating current circuit three-phase N-1 number of faults of receiving-end system unstability under case,Indicate be cause under i-th kind of synchronizing point by
The alternating current circuit three-phase N-2 number of faults of end system unstability,What is indicated is to lead to receiving-end system unstability under i-th kind of synchronizing point
Route list Yongzhong switch single tripping number of faults,What is indicated is the route for leading to receiving-end system unstability under i-th kind of synchronizing point
The number of faults of three Yongzhong switch single tripping.
3. the Asynchronous Interconnection sending emergency control method of reply DC Line Fault as described in claim 1, characterized in that step
Stress survey described in rapid 2 calculates, and more bigger more excellent type evaluation index, stress survey may be expressed as:For smaller more excellent type evaluation index, stress survey be may be expressed as:(4)
(5) in formula, rijIt is alternative j after standardization for the stress survey of index i；ximax、ximinRespectively evaluation index i
Maximum value and minimum value ximax=max (xi1,xi2,…xin)、ximin=min (xi1,xi2,…xin)；More feed-in short-circuit ratioes belong to
More bigger, more excellent type index, direct-current commutation failure risk and receiving-end system unstability risk belong to smaller more excellent type index.
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| CN112671026A (en) * | 2021-01-15 | 2021-04-16 | 国网湖北省电力有限公司电力科学研究院 | Safety stability evaluation method of receiving-end power grid under mixed double-feed-in direct current action |
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| CN112671026A (en) * | 2021-01-15 | 2021-04-16 | 国网湖北省电力有限公司电力科学研究院 | Safety stability evaluation method of receiving-end power grid under mixed double-feed-in direct current action |
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