CN109494779A - A kind of method and system obtaining soft straight line commutation device locking failure measure amount - Google Patents
A kind of method and system obtaining soft straight line commutation device locking failure measure amount Download PDFInfo
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- CN109494779A CN109494779A CN201811257900.9A CN201811257900A CN109494779A CN 109494779 A CN109494779 A CN 109494779A CN 201811257900 A CN201811257900 A CN 201811257900A CN 109494779 A CN109494779 A CN 109494779A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses a kind of method and system for obtaining soft straight line commutation device locking failure measure amount, belong to power system security stability control techniques field.The method of the present invention comprises determining that soft straight power grid Safety system topological structure；The calculating data of soft straight power grid Safety system converter blocking failure measure amount are obtained according to topological structure；Variable is calculated according to the soft straight power grid Safety system converter blocking failure measure amount of converter blocking fault definition；Converter blocking failure measure amount is obtained according to calculating data and calculating variable.This invention ensures that correct failure measure amount can be calculated in flexible direct current power grid Safety system its Safety system when converter blocking failure occurs, it can be with the safe and stable operation of effective guarantee flexible direct current power grid.
Description
Technical field
The present invention relates to power system security stability control techniques fields, and relate more specifically to a kind of soft straight electricity of acquisition
The method and system of net converter blocking failure measure amount.
Background technique
The grid-connected transmission of extensive generation of electricity by new energy is of great significance with consumption.Flexible DC transmission is a kind of advanced
HVDC Transmission Technology forms flexible direct current power grid based on flexible DC transmission technology, different geographical, different types of may be implemented
New-energy grid-connected collects, and realization stabilizes new energy and goes out the functions such as fluctuation.Therefore, flexible direct current power grid is in new energy power generation grid-connection
Consumption aspect has significant advantage, is one of the important directions of the following power network development.
Electric system security control device be the continuous development with power grid and developed a kind of raising power grid security, stabilization
Horizontal ancillary technique.Electric system security control device is mainly used for wide area to improve power grid security, maintenance level as the main purpose
Multiple plant stands or single plant stand Transient Stability Control.Security control device is made of a main website and several substations, execution station,
Its function is the realization process includes: power grid real-time traffic information and fault information acquisition, breakdown judge, failure measure amount calculate, refer to
Order assigns, instruction execution.Wherein, the calculating of failure measure amount is the core function of security control device.
The effect of soft straight power grid Safety system is to carry out event by acquiring soft straight power grid real-time traffic information and fault message
Barrier differentiates, carries out the calculating of failure measure amount according to fault type, the failure of soft straight power grid is realized by cutting the measures such as machine, cutting load
It passes through, guarantees the safe and stable operation of soft straight network system.
At present for flexible direct current electricity power engineering, lack the design method of its security control device, especially lacks it in failure feelings
The calculation method of Safety system failure measure amount under condition, this missing will seriously threaten the safe, steady of flexible direct current electricity power engineering
Determine operation level.
Summary of the invention
It is an object of the invention to solve at present to lack under converter blocking fault condition flexible direct current electricity power engineering
The problem of Safety system failure measure amount calculation method, ensures the safe and stable operation of flexible direct current electricity power engineering, proposes one
The method that kind obtains soft straight line commutation device locking failure measure amount, method include:
Determine soft straight power grid Safety system topological structure；
The calculating data of soft straight power grid Safety system converter blocking failure measure amount are obtained according to topological structure；
Variable is calculated according to the soft straight power grid Safety system converter blocking failure measure amount of converter blocking fault definition；
Converter blocking failure measure amount is obtained according to calculating data and calculating variable.
Optionally, soft straight power grid Safety system topological structure include: the soft straight true bipolar topology of power grid Safety system and
The soft true monopole topological structure of straight power grid Safety system.
Optionally, calculating data includes:
Converter station Si, wherein i is i-th of converter station, i=1,2,3,4 ... n；
Converter station Si anode layer inverter Si_P variable: maximum power PSmax_i_P, run power P before failureS0_i_P, it is maximum
Turn band quantity of power Δ PS_i_PWith significance bit VS_i_P；
Converter station Si negative electrode layer inverter Si_N variable: maximum power PSmax_i_N, run power P before failureS0_i_N, it is maximum
Turn band quantity of power Δ PS_i_NAnd VS_i_NSignificance bit；
Route Li, wherein i is i-th DC power transmission line, i=1,2,3,4 ... n；
Route Li anode layer transmission line of electricity Li_P variable: maximum power PLmax, initial launch power PL0_i_PAnd significance bit
VL_i_P；
Route Li negative electrode layer transmission line of electricity Li_N variable: maximum power PLmax, initial launch power PL0_i_NAnd significance bit
VL_i_N；
The converter station Si and route Li variable put into operation and are set to 1, exit and are set to 0.
Optionally, the calculating variable of definition includes:
System imbalance power is Δ P, non-faulting pole layer inverter maximum turns with power to be Δ P 'S_i_max, non-faulting pole
The maximum band power that turns of layer is Δ P '∑maxM, non-faulting pole sandwich circuit maximum turn band power be Δ P '∑maxL, system can turn band power be
ΔPtransIt is Ptrip with failure measure amount.
Optionally, calculating failure measure measurer body according to calculating data and calculating variable includes:
Inverter Si_x locking, then by VS_i_xIt is set to 0 by 1, wherein x=P, N, and defines x ' and negated for x, i.e., as x=N
X '=P, x '=N as x=P；
Determine the system imbalance power Δ P=P as caused by locking inverter Si_xS0_i_x；
Calculate non-faulting pole layer inverter Si_x′Maximum turn band power Δ P 'S_i_max=Δ PS_i_x′=VS_i_x′×
(PSmax_i_x′-PS0_i_x′)；
Obtain maximum turn of band quantity of power Δ P ' of non-faulting pole layer∑maxM=VS_3_x′×(PSmax_3_x′-PS0_3_x′)+VS_4_x′×
(PSmax_4_x′-PS0_4_x′)；
It obtains non-faulting pole sandwich circuit maximum and turns band power Δ P '∑maxL=VL_1_x′×(PLmax-PL0_1_x′)+VL_2_x′×
(PLmax-PL0_2_x′)；
Obtain soft straight power grid Safety system failure measure amount Δ Ptrans=min { Δ P 'S_i_max, Δ P '∑maxM, Δ P
’∑maxL}；
Failure measure amount Ptrip=Δ P- Δ Ptrans。
The present invention also provides a kind of system for obtaining soft straight line commutation device locking failure measure amount, system includes:
It determines topological structure module, determines soft straight power grid Safety system topological structure；
Data module is obtained, the meter of soft straight power grid Safety system converter blocking failure measure amount is obtained according to topological structure
Count evidence；
Variable module is obtained, according to the soft straight power grid Safety system converter blocking failure measure of converter blocking fault definition
Amount calculates variable；
Failure measure amount module is obtained, obtains converter blocking failure measure amount according to calculating data and calculating variable.
Optionally, soft straight power grid Safety system topological structure include: the soft straight true bipolar topology of power grid Safety system and
The soft true monopole topological structure of straight power grid Safety system.
Optionally, calculating data includes:
Converter station Si, wherein i is i-th of converter station, i=1,2,3,4 ... n；
Converter station Si anode layer inverter Si_P variable: maximum power PSmax_i_P, run power P before failureS0_i_P, it is maximum
Turn band quantity of power Δ PS_i_pWith significance bit VS_i_P；
Converter station Si negative electrode layer inverter Si_N variable: maximum power PSmax_i_N, run power P before failureS0_i_N, it is maximum
Turn band quantity of power Δ PS_i_NAnd VS_i_NSignificance bit；
Route Li, wherein i is i-th DC power transmission line, i=1,2,3,4 ... n；
Route Li anode layer transmission line of electricity Li_P variable: maximum power PLmax, initial launch power PL0_i_PAnd significance bit
VL_i_P；
Route Li negative electrode layer transmission line of electricity Li_N variable: maximum power PLmax, initial launch power PL0_i_NAnd significance bit
VL_i_N；
The converter station Si and route Li variable put into operation and are set to 1, exit and are set to 0.
Optionally, the calculating variable of definition includes:
System imbalance power is Δ P, non-faulting pole layer inverter maximum turns with power to be Δ P 'S_i_max, non-faulting pole
The maximum band power that turns of layer is Δ P '∑maxM, non-faulting pole sandwich circuit maximum turn band power be Δ P '∑maxL, system can turn band power be
ΔPtransIt is Ptrip with failure measure amount.
Optionally, calculating failure measure measurer body according to calculating data and calculating variable includes:
Inverter Si_x locking, then by VS_i_xIt is set to 0 by 1, wherein x=P, N, and defines x ' and negated for x, i.e., as x=N
X '=P, x '=N as x=P；
Determine the system imbalance power Δ P=P as caused by locking inverter Si_xS0_i_x；
Calculate non-faulting pole layer inverter Si_x′Maximum turn band power Δ P 'S_i_max=Δ PS_i_x′=VS_i_x′×
(PSmax_i_x′-PS0_i_x′)；
Obtain maximum turn of band quantity of power Δ P ' of non-faulting pole layer∑maxM=VS_3_x′×(PSmax_3_x′-PS0_3_x′)+VS_4_x′×
(PSmax_4_x′-PS0_4_x′)；
It obtains non-faulting pole sandwich circuit maximum and turns band power Δ P '∑maxL=VL_1_x′×(PLmax-PL0_1_x′)+VL_2_x′×
(PLmax-PL0_2_x′)；
Obtain soft straight power grid Safety system failure measure amount Δ Ptrans=min { Δ P 'S_i_max, Δ P '∑maxM, Δ P
’∑maxL}；
Failure measure amount Ptrip=Δ P- Δ Ptrans。
This invention ensures that its Safety system can be with when converter blocking failure occurs for flexible direct current power grid Safety system
Correct failure measure amount is calculated, it can be with the safe and stable operation of effective guarantee flexible direct current power grid.
Detailed description of the invention
Fig. 1 is a kind of soft straight power grid Safety system of method for obtaining soft straight line commutation device and being latched failure measure amount of the present invention
True bipolar topology structure chart；
Fig. 2 is a kind of soft straight power grid Safety system of method for obtaining soft straight line commutation device and being latched failure measure amount of the present invention
True bipolar topology engineering connection figure；
Fig. 3 is a kind of method flow diagram for obtaining soft straight line commutation device and being latched failure measure amount of the present invention；
Fig. 4 is a kind of system construction drawing for obtaining soft straight line commutation device and being latched failure measure amount of the present invention.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
The present invention provides a kind of method for obtaining soft straight line commutation device locking failure measure amount, as shown in Figure 3, comprising:
Soft straight power grid Safety system topological structure is determined, wherein soft straight power grid Safety system topological structure includes: soft straight electricity
The true bipolar topology of net Safety system and the soft true monopole topological structure of straight power grid Safety system；
Flexible direct current power grid generally uses true bipolar topology, and converter station number is greater than 3, and the present invention is true with four ends
It is introduced for bipolar soft straight looped network engineering, topological structure is as shown in Figure 1, four flexible direct current converter stations S1, S2, S3, S4
Composition flexible direct current annular power grid is connected through DC power transmission line L1, L2, L3, L4, flexible direct current annular power grid of the present invention uses
True dipolar configuration, each converter station includes anode layer inverter and negative electrode layer inverter, and two inverter exchange sides are mutual
Connection；DC power transmission line includes anode layer DC power transmission line and negative electrode layer DC power transmission line, every DC line both ends
It is installed with dc circuit breaker.Each pole layer shares 4 converter stations, 4 routes, 8 dc circuit breakers.
By taking single pole layer as an example, specific connection type is as shown in Figure 2, wherein the DC power transmission line group cyclization of homopolarity layer
Dc circuit breaker is installed at net, every DC line both ends, when ground fault or maintenance occur for DC line, can pass through disconnection
The dc circuit breaker at its both ends is isolated；Inverter is connected to the looped network of DC line composition by mechanical high-speed switch,
After inverter is because of failure or maintenance locking, by disconnecting mechanical high-speed switch, which can be cut from looped network of DC power
It removes, the node on looped network is not impacted.
Because the exchange side of same converter station positive and negative electrode layer inverter is connected, and the power distribution between two inverters be can
Control amount, therefore when a certain pole layer inverter, which can transport capacity because of failure and other reasons, to be reduced, it can be by extra power through another pole
Layer inverter conveying, the process are known as " power turns band ", turn band by the power between inverter, it can be achieved that the power of pole interlayer turns
Band.
The calculating data of soft straight power grid Safety system converter blocking failure measure amount are obtained according to topological structure；
Wherein, calculating data includes:
Converter station Si, wherein i is i-th of converter station, i=1,2,3,4 ... n；
Converter station Si anode layer inverter Si_P variable: maximum power PSmax_i_P, run power P before failureS0_i_P, it is maximum
Turn band quantity of power Δ PS_i_PWith significance bit VS_i_P；
Converter station Si negative electrode layer inverter Si_N variable: maximum power PSmax_i_N, run power P before failureS0_i_N, it is maximum
Turn band quantity of power Δ PS_i_NAnd VS_i_NSignificance bit；
Route Li, wherein i is i-th DC power transmission line, i=1,2,3,4 ... n；
Route Li anode layer transmission line of electricity Li_P variable: maximum power PLmax, initial launch power PL0_i_PAnd significance bit
VL_i_P；
Route Li negative electrode layer transmission line of electricity Li_N variable: maximum power PLmax, initial launch power PL0_i_NAnd significance bit
VL_i_N；
The converter station Si and route Li variable put into operation and are set to 1, exit and are set to 00.
Variable is calculated according to the soft straight power grid Safety system converter blocking failure measure amount of converter blocking fault definition；
The calculating variable of definition includes:
System imbalance power is Δ P: being referred to because imbalance power caused by failure, need to turn the Partial Power
Band；If band underpower can be turned, carry out cutting sending end blower；
It is Δ P ' that non-faulting pole layer inverter maximum, which turns band power,S_i_max: refer to the inverter for breaking down, non-event
Hinder the remaining Capacity Margin of pole layer inverter, i.e. inverter maximum turns band quantity of power Δ PS_i_x；
The layer maximum band power that turns in non-faulting pole is Δ P '∑maxM: refer to that all inverters of layer remaining capacity in non-faulting pole is abundant
The sum of degree, i.e. the pole interlayer maximum of consideration inverter capacity limit can turn band power；
It is Δ P ' that non-faulting pole sandwich circuit maximum, which turns band power,∑maxL: after referring to that consideration turns band, non-faulting pole each direct current of layer
Minimum value in capacity of trunk nargin, i.e. the pole interlayer maximum of consideration DC line capacity limit can turn band power；
It is Δ P that system, which can turn band power,trans: can turn band power is Δ P 'S_i_max、ΔP’∑maxM、ΔP’∑maxLIn three
Minimum value；
Failure measure amount is Ptrip: referring to the power of fan that sending end needs to cut off, for system imbalance power and can turn band function
The difference of rate, if system imbalance power is less than the difference that can turn band power, cutting machine amount is 0.
Converter blocking failure measure amount is obtained according to calculating data and calculating variable, is specifically included:
Inverter Si_x locking, then by VS_i_xIt is set to 0 by 1, wherein x=P, N, and defines x ' and negated for x, i.e., as x=N
X '=P, x '=N as x=P；
Determine the system imbalance power Δ P=P as caused by locking inverter Si_xS0_i_x；
Calculate non-faulting pole layer inverter Si_x′Maximum turn band power Δ P 'S_i_max=Δ PS_i_x′=VS_i_x′×
(PSmax_i_x′-PS0_i_x′)；
Obtain maximum turn of band quantity of power Δ P ' of non-faulting pole layer∑maxM=VS_3_x′×(PSmax_3_x′-PS0_3_x′)+VS_4_x′×
(PSmax_4_x′-PS0_4_x′)；
It obtains non-faulting pole sandwich circuit maximum and turns band power Δ P '∑maxL=VL_1_x′×(PLmax-PL0_1_x′)+VL_2_x′×
(PLmax-PL0_2_x′)；
Obtain soft straight power grid Safety system failure measure amount Δ Ptrans=min { Δ P 's_i_max, Δ P '∑maxM, Δ P
’∑maxL}；
Cut machine amount Ptrip=Δ P- Δ Ptrans。
Also a kind of system 200 for obtaining soft straight line commutation device locking failure measure amount of the present invention, as shown in figure 4, system
Include:
It determines topological structure module 201, determines soft straight power grid Safety system topological structure, wherein soft straight power grid peace control system
Topological structure of uniting includes: the true bipolar topology of soft straight power grid Safety system and the soft true monopole topology knot of straight power grid Safety system
Structure.
Data module 202 is obtained, soft straight power grid Safety system converter blocking failure measure amount is obtained according to topological structure
Calculating data, wherein calculate data include:
Converter station Si, wherein i is i-th of converter station, i=1,2,3,4 ... n；
Converter station Si anode layer inverter Si_P variable: maximum power PSmax_i_P, run power P before failureS0_i_P, it is maximum
Turn band quantity of power Δ PS_i_PWith significance bit VS_i_P；
Converter station Si negative electrode layer inverter Si_N variable: maximum power PSmax_i_N, run power P before failureS0_i_N, it is maximum
Turn band quantity of power Δ PS_i_NAnd VS_i_NSignificance bit；
Route Li, wherein i is i-th DC power transmission line, i=1,2,3,4 ... n；
Route Li anode layer transmission line of electricity Li_P variable: maximum power PLmax, initial launch power PL0_i_PAnd significance bit
VL_i_P；
Route Li negative electrode layer transmission line of electricity Li_N variable: maximum power PLmax, initial launch power PL0_i_NAnd significance bit
VL_i_N；
The converter station Si and route Li variable put into operation and are set to 1, exit and are set to 0.
Variable module 203 is obtained, according to the soft straight power grid Safety system converter blocking failure of converter blocking fault definition
Measure amount calculates variable, wherein the calculating variable of definition includes:
System imbalance power is Δ P: being referred to because imbalance power caused by failure, need to turn the Partial Power
Band；If band underpower can be turned, carry out cutting sending end blower；
It is Δ P ' that non-faulting pole layer inverter maximum, which turns band power,S_i_max: refer to the inverter for breaking down, non-event
Hinder the remaining Capacity Margin of pole layer inverter, i.e. inverter maximum turns band quantity of power Δ PS_i_x；
The layer maximum band power that turns in non-faulting pole is Δ P '∑maxM: refer to that all inverters of layer remaining capacity in non-faulting pole is abundant
The sum of degree, i.e. the pole interlayer maximum of consideration inverter capacity limit can turn band power；
It is Δ P ' that non-faulting pole sandwich circuit maximum, which turns band power,∑maxL: after referring to that consideration turns band, non-faulting pole each direct current of layer
Minimum value in capacity of trunk nargin, i.e. the pole interlayer maximum of consideration DC line capacity limit can turn band power；
It is Δ P that system, which can turn band power,trans: can turn band power is Δ P 'S_i_max、ΔP’∑maxM、ΔP’∑maxLIn three
Minimum value；
Failure measure amount is Ptrip: referring to the power of fan that sending end needs to cut off, for system imbalance power and can turn band function
The difference of rate, if system imbalance power is less than the difference that can turn band power, cutting machine amount is 0.
Failure measure amount module 204 is obtained, obtains converter blocking failure measure amount according to calculating data and calculating variable.
It specifically includes:
Inverter Si_x locking, then by VS_i_xIt is set to 0 by 1, wherein x=P, N, and defines x ' and negated for x, i.e., as x=N
X '=P, x '=N as x=P；
Determine the system imbalance power Δ P=P as caused by locking inverter Si_xS0_i_x；
Calculate non-faulting pole layer inverter Si_x′Maximum turn band power Δ P 'S_i_max=Δ PS_i_x′=VS_i_x′×
(PSmax_i_x′-PS0_i_x′)；
Obtain maximum turn of band quantity of power Δ P ' of non-faulting pole layer∑maxM=VS_3_x′×(PSmax_3_x′-PS0_3_x′)+VS_4_x′×
(PSmax_4_x′-PS0_4_x′)；
It obtains non-faulting pole sandwich circuit maximum and turns band power Δ P '∑maxL=VL_1_x′×(PLmax-PL0_1_x′)+VL_2_x′×
(PLmax-PL0_2_x′)；
Obtain soft straight power grid Safety system failure measure amount Δ Ptrans=min { Δ P 'S_i_max, Δ P '∑maxM, Δ P
’∑maxL}；
Failure measure amount Ptrip=Δ P- Δ Ptrans。
This invention ensures that its Safety system can be with when converter blocking failure occurs for flexible direct current power grid Safety system
Correct failure measure amount is calculated, it can be with the safe and stable operation of effective guarantee flexible direct current power grid.
Claims (10)
1. a kind of method for obtaining soft straight line commutation device locking failure measure amount, which comprises
Determine soft straight power grid Safety system topological structure；
The calculating data of soft straight power grid Safety system converter blocking failure measure amount are obtained according to topological structure；
Variable is calculated according to the soft straight power grid Safety system converter blocking failure measure amount of converter blocking fault definition；
Converter blocking failure measure amount is obtained according to calculating data and calculating variable.
2. according to the method described in claim 1, the soft straight power grid Safety system topological structure includes: soft straight power grid peace control
The true bipolar topology of system and the soft true monopole topological structure of straight power grid Safety system.
3. according to the method described in claim 1, the calculating data include:
Converter station Si, wherein i be i-th of converter station, i=1,2,3,4...n；
Converter station Si anode layer inverter Si_P variable: maximum power PSmax_i_P, run power P before failureS0_i_P, maximum turn band
Quantity of power Δ PS_i_PWith significance bit VS_i_P；
Converter station Si negative electrode layer inverter Si_N variable: maximum power PSmax_i_N, run power P before failureSO_i_N, maximum turn band
Quantity of power Δ PS_i_NAnd VS_i_NSignificance bit；
Route Li, wherein i be i-th DC power transmission line, i=1,2,3,4...n；
Route Li anode layer transmission line of electricity Li_P variable: maximum power PLmax, initial launch power PL0_i_PWith significance bit VL_i_P；
Route Li negative electrode layer transmission line of electricity Li_N variable: maximum power PLmax, initial launch power PL0_i_NWith significance bit VL_i_N；
The converter station Si and route Li variable put into operation and are set to 1, exit and are set to 0.
4. according to the method described in claim 1, the calculating variable of the definition includes:
System imbalance power is Δ P, non-faulting pole layer inverter maximum turns with power to be Δ P 'S_i_max, non-faulting pole layer it is maximum
Turning band power is Δ P '∑maxM, non-faulting pole sandwich circuit maximum turn band power be Δ P '∑maxL, system can turn band power be Δ
PtransIt is Ptrip with failure measure amount.
5. according to the method described in claim 1, described calculate failure measure measurer body according to calculating data and calculating variable
Include:
Inverter Si_x locking, then by VS_i_xBe set to 0 by 1, wherein x=P, N, and define x ' and negated for x, i.e., as x=N x '=
P, x '=N as x=P；
Determine the system imbalance power Δ P=P as caused by locking inverter Si_xS0_i_x；
Calculate non-faulting pole layer inverter Si_x′Maximum turn band power Δ P 'S_i_max=Δ PS_i_x′=VS_i_x′×(PSmax_i_x′-
PS0_i_x′)；
Obtain maximum turn of band quantity of power Δ P ' of non-faulting pole layer∑maxM=VS_3_x′×(PSmax_3_x′-PS0_3_x′)+VS_4_x′×
(PSmax_4_x′-PS0_4_x′):
It obtains non-faulting pole sandwich circuit maximum and turns band power Δ P '∑maxL=VL_1_x′×(PLmax-PLO_1_x′)+VL_2_x′×(PLmax-
PL0_2_x′)；
Obtain soft straight power grid Safety system failure measure amount Δ Ptrans=min { Δ P 'S_i_max, Δ P '∑maxM, Δ P '∑maxL};
Failure measure amount Ptrip=Δ P- Δ Ptrans。
6. a kind of system for obtaining soft straight line commutation device locking failure measure amount, the system comprises:
It determines topological structure module, determines soft straight power grid Safety system topological structure；
Data module is obtained, the calculating number of soft straight power grid Safety system converter blocking failure measure amount is obtained according to topological structure
According to；
Variable module is obtained, according to the soft straight power grid Safety system converter blocking failure measure meter of converter blocking fault definition
Calculate variable；
Failure measure amount module is obtained, obtains converter blocking failure measure amount according to calculating data and calculating variable.
7. system according to claim 6, the soft straight power grid Safety system topological structure includes: soft straight power grid peace control
The true bipolar topology of system and the soft true monopole topological structure of straight power grid Safety system.
8. system according to claim 6, the calculating data include:
Converter station Si, wherein i be i-th of converter station, i=1,2,3,4...n；
Converter station Si anode layer inverter Si_P variable: maximum power PSmax_i_P, run power P before failureS0_i_P, maximum turn band
Quantity of power Δ PS_i_PWith significance bit VS_i_P；
Converter station Si negative electrode layer inverter Si_N variable: maximum power PSmax_i_N, run power P before failureS0_i_N, maximum turn band
Quantity of power Δ PS_i_NAnd VS_i_NSignificance bit；
Route Li, wherein i be i-th DC power transmission line, i=1,2,3,4...n；
Route Li anode layer transmission line of electricity Li_P variable: maximum power PLmax, initial launch power PL0_i_PWith significance bit VL_i_P；
Route Li negative electrode layer transmission line of electricity Li_N variable: maximum power PLmax, initial launch power PL0_i_NWith significance bit VL_i_N；
The converter station Si and route Li variable put into operation and are set to 1, exit and are set to 0.
9. the calculating variable of system according to claim 6, the definition includes:
System imbalance power is Δ P, non-faulting pole layer inverter maximum turns with power to be Δ P 'S_i_max, non-faulting pole layer it is maximum
Turning band power is Δ P '∑maxM, non-faulting pole sandwich circuit maximum turn band power be Δ P '∑maxL, system can turn band power be Δ
PtransIt is Ptrip with failure measure amount.
10. system according to claim 6, described to calculate failure measure measurer body according to calculating data and calculating variable
Include:
Inverter Si_x locking, then by VS_i_xBe set to 0 by 1, wherein x=P, N, and define x ' and negated for x, i.e., as x=N x '=
P, x '=N as x=P；
Determine the system imbalance power Δ P=P as caused by locking inverter Si_xS0_i_x；
Calculate non-faulting pole layer inverter Si_x′Maximum turn band power Δ P 'S_i_max=Δ PS_i_x′=VS_i_x′×(PSmax_i_x′-
PS0_i_x′)；
Obtain maximum turn of band quantity of power Δ P ' of non-faulting pole layer∑maxM=VS_3_x′×(PSmax_3_x′-PS0_3_x′)+VS_4_x′×
(PSmax_4_x′-PS0_4_x′)；
It obtains non-faulting pole sandwich circuit maximum and turns band power Δ P '∑maxL=VL_1_x′×(PLmax-PLO_1_x′)+VL_2_x′×(PLmax-
PLO_2_x′)；
Obtain soft straight power grid Safety system failure measure amount Δ Ptrans=min { Δ P 'S_i_max, Δ P '∑maxM, Δ P '∑maxL}；
Failure measure amount Ptrip=Δ P- Δ Ptrans。
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