CN109494779B - Method and system for acquiring locking fault measure quantity of converter of flexible direct current power grid - Google Patents
Method and system for acquiring locking fault measure quantity of converter of flexible direct current power grid Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—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
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Abstract
The invention discloses a method and a system for acquiring a blocking fault measure quantity of a converter of a flexible direct current power grid, and belongs to the technical field of safety and stability control of a power system. The method comprises the following steps: determining a flexible direct current power grid security control system topological structure; acquiring calculation data of the blocking fault measure quantity of the converter of the safety control system of the flexible direct current power grid according to the topological structure; defining a measure quantity of the converter locking fault of the soft direct current power grid security control system according to the converter locking fault to calculate a variable; and acquiring the converter locking fault measure quantity according to the calculation data and the calculation variable. The method ensures that the safety control system of the flexible direct-current power grid can calculate the correct fault measure amount when the converter locking fault occurs, and can effectively ensure the safe and stable operation of the flexible direct-current power grid.
Description
Technical Field
The invention relates to the technical field of safety and stability control of power systems, in particular to a method and a system for acquiring a blocking fault measure quantity of a converter of a flexible direct current power grid.
Background
The grid-connected transmission and consumption of large-scale new energy power generation have important significance. The flexible direct current transmission is an advanced direct current transmission technology, a flexible direct current power grid is formed based on the flexible direct current transmission technology, new energy sources in different regions and different types can be combined in a grid, and functions of stabilizing output fluctuation of the new energy sources and the like are achieved. Therefore, the flexible direct-current power grid has remarkable advantages in the aspect of new energy power generation grid connection consumption, and is one of important directions of future power grid development.
The safety control device of the power system is an auxiliary technology which is developed along with the continuous development of a power grid and is used for improving the safety and stability of the power grid. The safety control device of the power system mainly aims at improving the safety and stability level of a power grid and is mainly used for transient stability control of a plurality of stations or a single station in a wide area. The safety control device consists of a main station, a plurality of substations and an execution station, and the function realization process comprises the following steps: collecting real-time operation information and fault information of a power grid, judging faults, calculating fault measure quantity, issuing instructions and executing the instructions. Wherein, the calculation of the fault measure amount is the core function of the safety control device.
The safety control system of the flexible direct current power grid has the functions of carrying out fault judgment by collecting real-time operation information and fault information of the flexible direct current power grid, carrying out fault measure calculation according to fault types, realizing fault ride-through of the flexible direct current power grid through measures such as a generator tripping and load shedding and ensuring safe and stable operation of the flexible direct current power grid system.
At present, for flexible direct current power grid engineering, a design method of a safety control device of the flexible direct current power grid engineering is lacked, particularly a method for calculating fault measure quantity of a safety control system under the fault condition is lacked, and the lacked method seriously threatens the safe and stable operation level of the flexible direct current power grid engineering.
Disclosure of Invention
The invention aims to solve the problem that a method for calculating the fault measure quantity of a safety control system under the condition of lack of converter locking faults in the flexible direct-current power grid project at present, ensure the safe and stable operation of the flexible direct-current power grid project, and provide a method for acquiring the locking fault measure quantity of the converter of the flexible direct-current power grid, wherein the method comprises the following steps:
determining a flexible direct current power grid security control system topological structure;
acquiring calculation data of the blocking fault measure quantity of the converter of the safety control system of the flexible direct current power grid according to the topological structure;
defining a measure quantity of the converter locking fault of the soft direct current power grid security control system according to the converter locking fault to calculate a variable;
and acquiring the converter locking fault measure quantity according to the calculation data and the calculation variable.
Optionally, the flexible direct current power grid safety control system topological structure includes: the flexible direct-current power grid security control system is of a true bipolar topological structure and the flexible direct-current power grid security control system is of a true unipolar topological structure.
Optionally, calculating data includes:
a converter station Si, where i is the ith converter station, i is 1,2,3,4 … n;
variable of a converter Si _ P of the converter station Si positive electrode layer: maximum power PSmax_i_POperating power before failure PS0_i_PMaximum band-rotating power quantity delta PS_i_PAnd a valid bit VS_i_P；
Variable of a converter station Si cathode layer converter Si _ N: maximum power PSmax_i_NOperating power before failure PS0_i_NMaximum band-rotating power quantity delta PS_i_NAnd VS_i_NA valid bit;
a line Li, where i is the ith dc transmission line, and i is 1,2,3,4 … n;
variable of transmission line Li _ P of Li positive electrode layer of line: maximum power PLmaxInitial operating power PL0_i_PAnd a valid bit VL_i_P；
Variable of transmission line Li _ N on Li negative pole layer of line: maximum power PLmaxInitial operating power PL0_i_NAnd a valid bit VL_i_N；
And the variable operation of the converter station Si and the variable operation of the line Li are set to be 1, and the exit is set to be 0.
Optionally, the defined calculation variables include:
the system unbalanced power is delta P, and the maximum strip-rotating power of the non-fault pole layer converter is delta P'S_i_maxThe maximum strip power of the non-fault electrode layer is delta P'∑maxMThe maximum strip power of the non-fault electrode layer line is delta P'∑maxLThe system can transfer the band power to delta PtransAnd the quantity of faulty measures is Ptrip.
Optionally, calculating the failure measure amount according to the calculation data and the calculation variable specifically includes:
the converter Si _ x is locked, then V is setS_i_xIs set to 0 by 1, where x ═ P, N, and x' is defined as x, inverted, i.e., x ═ P when x ═ N, x ═ N when x ═ P;
determining the system imbalance power Δ P ═ P caused by the blocking converter Si _ xS0_i_x；
Calculating non-fault pole layer converter Si_x′Is the maximum strip power delta P'S_i_max＝ΔPS_i_x′＝VS_i_x′×(PSmax_i_x′-PS0_i_x′)；
Obtaining maximum strip power quantity delta P 'of non-fault electrode layer'∑maxM＝VS_3_x′×(PSmax_3_x′-PS0_3_x′)+VS_4_x′×(PSmax_4_x′-PS0_4_x′)；
Obtaining maximum line-to-tape power delta P 'of non-fault electrode layer'∑maxL＝VL_1_x′×(PLmax-PL0_1_x′)+VL_2_x′×(PLmax-PL0_2_x′)；
Obtaining fault measure quantity delta P of safety control system of flexible direct current power gridtrans＝min{ΔP’S_i_max，ΔP’∑maxM，ΔP’∑maxL}；
Amount of faulty measure Ptrip＝ΔP-ΔPtrans。
The invention also provides a system for obtaining the blocking fault measure quantity of the converter of the flexible direct current power grid, which comprises the following steps:
determining a topological structure module, and determining a topological structure of the safety control system of the flexible direct current power grid;
the data acquisition module is used for acquiring calculation data of the locking fault measure quantity of the current converter of the safety control system of the flexible direct current power grid according to the topological structure;
the variable obtaining module is used for defining a flexible direct current power grid safety control system converter locking fault measure quantity calculation variable according to the converter locking fault;
and the module for obtaining the fault measure quantity obtains the converter locking fault measure quantity according to the calculation data and the calculation variable.
Optionally, the flexible direct current power grid safety control system topological structure includes: the flexible direct-current power grid security control system is of a true bipolar topological structure and the flexible direct-current power grid security control system is of a true unipolar topological structure.
Optionally, calculating data includes:
a converter station Si, where i is the ith converter station, i is 1,2,3,4 … n;
variable of a converter Si _ P of the converter station Si positive electrode layer: maximum power PSmax_i_POperating power before failure PS0_i_PMaximum band-rotating power quantity delta PS_i_pAnd a valid bit VS_i_P；
Variable of a converter station Si cathode layer converter Si _ N: maximum power PSmax_i_NOperating power before failure PS0_i_NMaximum band-rotating power quantity delta PS_i_NAnd VS_i_NA valid bit;
a line Li, where i is the ith dc transmission line, and i is 1,2,3,4 … n;
variable of transmission line Li _ P of Li positive electrode layer of line: maximum power PLmaxInitial operating power PL0_i_PAnd a valid bit VL_i_P；
Variable of transmission line Li _ N on Li negative pole layer of line: maximum power PLmaxInitial operating power PL0_i_NAnd a valid bit VL_i_N；
And the variable operation of the converter station Si and the variable operation of the line Li are set to be 1, and the exit is set to be 0.
Optionally, the defined calculation variables include:
unbalanced power of system is delta P, non-fault poleThe maximum strip-rotating power of the layer converter is delta P'S_i_maxThe maximum strip power of the non-fault electrode layer is delta P'∑maxMThe maximum strip power of the non-fault electrode layer line is delta P'∑maxLThe system can transfer the band power to delta PtransAnd the quantity of faulty measures is Ptrip.
Optionally, calculating the failure measure amount according to the calculation data and the calculation variable specifically includes:
the converter Si _ x is locked, then V is setS_i_xIs set to 0 by 1, where x ═ P, N, and x' is defined as x, inverted, i.e., x ═ P when x ═ N, x ═ N when x ═ P;
determining the system imbalance power Δ P ═ P caused by the blocking converter Si _ xS0_i_x；
Calculating non-fault pole layer converter Si_x′Is the maximum strip power delta P'S_i_max＝ΔPS_i_x′＝VS_i_x′×(PSmax_i_x′-PS0_i_x′)；
Obtaining maximum strip power quantity delta P 'of non-fault electrode layer'∑maxM＝VS_3_x′×(PSmax_3_x′-PS0_3_x′)+VS_4_x′×(PSmax_4_x′-PS0_4_x′)；
Obtaining maximum line-to-tape power delta P 'of non-fault electrode layer'∑maxL＝VL_1_x′×(PLmax-PL0_1_x′)+VL_2_x′×(PLmax-PL0_2_x′)；
Obtaining fault measure quantity delta P of safety control system of flexible direct current power gridtrans＝min{ΔP’S_i_max，ΔP’∑maxM，ΔP’∑maxL}；
Amount of faulty measure Ptrip＝ΔP-ΔPtrans。
The method ensures that the safety control system of the flexible direct-current power grid can calculate the correct fault measure amount when the converter locking fault occurs, and can effectively ensure the safe and stable operation of the flexible direct-current power grid.
Drawings
Fig. 1 is a structure diagram of a true bipolar topology structure of a soft direct current power grid safety control system according to a method for obtaining a blocking fault measure quantity of a converter of the soft direct current power grid;
FIG. 2 is a wiring diagram of a flexible direct current power grid safety control system true bipolar topological structure engineering of the method for obtaining the blocking fault measure quantity of the converter of the flexible direct current power grid;
FIG. 3 is a flowchart of a method for obtaining a blocking fault measure quantity of a converter of a flexible direct current power grid according to the present invention;
fig. 4 is a system configuration diagram for obtaining the blocking fault measure quantity of the converter of the flexible direct current power grid according to the invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a method for acquiring a blocking fault measure quantity of a converter of a flexible direct current power grid, which comprises the following steps of:
determining a flexible direct current power grid security control system topological structure, wherein the flexible direct current power grid security control system topological structure comprises: the flexible direct-current power grid security control system is of a true bipolar topological structure and a flexible direct-current power grid security control system is of a true monopolar topological structure;
the flexible direct current ring-shaped power grid adopts a true bipolar structure, the number of the converter stations is more than 3, the invention takes four-end true bipolar flexible direct current ring network engineering as an example for introduction, the topological structure is shown in figure 1, four flexible direct current converter stations S1, S2, S3 and S4 are connected through direct current transmission lines L1, L2, L3 and L4 to form the flexible direct current ring-shaped power grid, the flexible direct current ring-shaped power grid adopts a true bipolar structure, each converter station comprises a positive pole layer converter and a negative pole layer converter, and the alternating current sides of the two converters are connected with each other; the direct current transmission line comprises a positive pole layer direct current transmission line and a negative pole layer direct current transmission line, and two ends of each direct current transmission line are provided with direct current circuit breakers. Each pole layer has 4 converter stations, 4 lines and 8 direct current breakers.
Taking a single pole layer as an example, the specific connection mode is shown in fig. 2, wherein the direct current transmission lines on the same pole layer form a ring network, both ends of each direct current line are provided with direct current circuit breakers, and when the direct current lines have ground faults or are overhauled, the direct current circuit breakers at both ends of the direct current lines can be disconnected for isolation; the current converter is connected to a ring network formed by direct current lines through the mechanical quick switch, and when the current converter is locked due to faults or maintenance, the current converter can be cut off from the direct current ring network by disconnecting the mechanical quick switch without influencing the node on the ring network.
Because the AC sides of the positive pole layer converter and the negative pole layer converter of the same converter station are connected and the power distribution between the two converters is controllable, when the capacity which can be transmitted by one pole layer converter is reduced due to faults and the like, redundant power can be transmitted by the other pole layer converter, the process is called power transfer band, and the power transfer band between the pole layers can be realized through the power transfer band between the converters.
Acquiring calculation data of the blocking fault measure quantity of the converter of the safety control system of the flexible direct current power grid according to the topological structure;
wherein calculating the data comprises:
a converter station Si, where i is the ith converter station, i is 1,2,3,4 … n;
variable of a converter Si _ P of the converter station Si positive electrode layer: maximum power PSmax_i_POperating power before failure PS0_i_PMaximum band-rotating power quantity delta PS_i_PAnd a valid bit VS_i_P；
Variable of a converter station Si cathode layer converter Si _ N: maximum power PSmax_i_NBefore failureOperating power PS0_i_NMaximum band-rotating power quantity delta PS_i_NAnd VS_i_NA valid bit;
a line Li, where i is the ith dc transmission line, and i is 1,2,3,4 … n;
variable of transmission line Li _ P of Li positive electrode layer of line: maximum power PLmaxInitial operating power PL0_i_PAnd a valid bit VL_i_P；
Variable of transmission line Li _ N on Li negative pole layer of line: maximum power PLmaxInitial operating power PL0_i_NAnd a valid bit VL_i_N；
The variable operation of the converter station Si and the variable operation of the line Li are set to be 1, and the exit is set to be 00.
Defining a measure quantity of the converter locking fault of the soft direct current power grid security control system according to the converter locking fault to calculate a variable;
the defined computational variables include:
the system unbalanced power is Δ P: the unbalanced power caused by the fault needs to be transferred; if the power of the rotatable belt is insufficient, a fan at the cutting and feeding end is needed;
maximum strip power of inverter of non-fault electrode layer is delta P'S_i_max: the residual capacity margin of the converter with a non-fault pole layer of the converter with a fault, namely the maximum converter power quantity delta P of the converterS_i_x；
The maximum strip power of the non-fault electrode layer is delta P'∑maxM: the sum of the residual capacity margins of all converters on the non-fault pole layer is referred to, namely the maximum transferable power between the pole layers considering the capacity limit of the converters;
the maximum strip power of a non-fault electrode layer line is delta P'∑maxL: after the switching is considered, the minimum value of the capacity margins of each direct current line of the non-fault pole layer is considered, namely the maximum switchable power between the pole layers which is limited by the capacity of the direct current line is considered;
system transferable band power is delta Ptrans: the transferable power is delta P'S_i_max、ΔP’∑maxM、ΔP’∑maxLThe minimum of the three;
the number of faulty measures is Ptrip: the power of the fan to be cut off at the sending end is the difference between the unbalanced power and the rotatable power of the system, and if the unbalanced power of the system is smaller than the difference between the rotatable power, the amount of the cutter is 0.
Obtaining the converter locking fault measure quantity according to the calculation data and the calculation variable, which specifically comprises the following steps:
the converter Si _ x is locked, then V is setS_i_xIs set to 0 by 1, where x ═ P, N, and x' is defined as x, inverted, i.e., x ═ P when x ═ N, x ═ N when x ═ P;
determining the system imbalance power Δ P ═ P caused by the blocking converter Si _ xS0_i_x；
Calculating non-fault pole layer converter Si_x′Is the maximum strip power delta P'S_i_max＝ΔPS_i_x′＝VS_i_x′×(PSmax_i_x′-PS0_i_x′)；
Obtaining maximum strip power quantity delta P 'of non-fault electrode layer'∑maxM＝VS_3_x′×(PSmax_3_x′-PS0_3_x′)+VS_4_x′×(PSmax_4_x′-PS0_4_x′)；
Obtaining maximum line-to-tape power delta P 'of non-fault electrode layer'∑maxL＝VL_1_x′×(PLmax-PL0_1_x′)+VL_2_x′×(PLmax-PL0_2_x′)；
Obtaining fault measure quantity delta P of safety control system of flexible direct current power gridtrans＝min{ΔP’s_i_max，ΔP’∑maxM，ΔP’∑maxL}；
Amount of cutting machine Ptrip＝ΔP-ΔPtrans。
The present invention further provides a system 200 for obtaining a blocking fault measure quantity of a converter in a flexible direct current power grid, as shown in fig. 4, the system includes:
determining a topological structure module 201, determining a topological structure of a flexible direct current power grid security control system, wherein the topological structure of the flexible direct current power grid security control system comprises: the flexible direct-current power grid security control system is of a true bipolar topological structure and the flexible direct-current power grid security control system is of a true unipolar topological structure.
The data obtaining module 202 obtains calculation data of the blocking fault measure quantity of the converter of the safety control system of the flexible direct current power grid according to the topological structure, wherein the calculation data includes:
a converter station Si, where i is the ith converter station, i is 1,2,3,4 … n;
variable of a converter Si _ P of the converter station Si positive electrode layer: maximum power PSmax_i_POperating power before failure PS0_i_PMaximum band-rotating power quantity delta PS_i_PAnd a valid bit VS_i_P；
Variable of a converter station Si cathode layer converter Si _ N: maximum power PSmax_i_NOperating power before failure PS0_i_NMaximum band-rotating power quantity delta PS_i_NAnd VS_i_NA valid bit;
a line Li, where i is the ith dc transmission line, and i is 1,2,3,4 … n;
variable of transmission line Li _ P of Li positive electrode layer of line: maximum power PLmaxInitial operating power PL0_i_PAnd a valid bit VL_i_P；
Variable of transmission line Li _ N on Li negative pole layer of line: maximum power PLmaxInitial operating power PL0_i_NAnd a valid bit VL_i_N；
And the variable operation of the converter station Si and the variable operation of the line Li are set to be 1, and the exit is set to be 0.
The variable obtaining module 203 defines a flexible direct current power grid safety control system converter blocking fault measure quantity calculation variable according to the converter blocking fault, wherein the defined calculation variable includes:
the system unbalanced power is Δ P: the unbalanced power caused by the fault needs to be transferred; if the power of the rotatable belt is insufficient, a fan at the cutting and feeding end is needed;
maximum strip power of inverter of non-fault electrode layer is delta P'S_i_max: the residual capacity margin of the converter with a non-fault pole layer of the converter with a fault, namely the maximum converter power quantity delta P of the converterS_i_x；
The maximum strip power of the non-fault electrode layer is delta P'∑maxM: to the non-fault electrode layerThe sum of the residual capacity margins of the converter is considered, namely the maximum transferable band power between the pole layers limited by the capacity of the converter is considered;
the maximum strip power of a non-fault electrode layer line is delta P'∑maxL: after the switching is considered, the minimum value of the capacity margins of each direct current line of the non-fault pole layer is considered, namely the maximum switchable power between the pole layers which is limited by the capacity of the direct current line is considered;
system transferable band power is delta Ptrans: the transferable power is delta P'S_i_max、ΔP’∑maxM、ΔP’∑maxLThe minimum of the three;
the number of faulty measures is Ptrip: the power of the fan to be cut off at the sending end is the difference between the unbalanced power and the rotatable power of the system, and if the unbalanced power of the system is smaller than the difference between the rotatable power, the amount of the cutter is 0.
And a failure measure quantity obtaining module 204 for obtaining the converter locking failure measure quantity according to the calculation data and the calculation variable. The method specifically comprises the following steps:
the converter Si _ x is locked, then V is setS_i_xIs set to 0 by 1, where x ═ P, N, and x' is defined as x, inverted, i.e., x ═ P when x ═ N, x ═ N when x ═ P;
determining the system imbalance power Δ P ═ P caused by the blocking converter Si _ xS0_i_x；
Calculating non-fault pole layer converter Si_x′Is the maximum strip power delta P'S_i_max＝ΔPS_i_x′＝VS_i_x′×(PSmax_i_x′-PS0_i_x′)；
Obtaining maximum strip power quantity delta P 'of non-fault electrode layer'∑maxM＝VS_3_x′×(PSmax_3_x′-PS0_3_x′)+VS_4_x′×(PSmax_4_x′-PS0_4_x′)；
Obtaining maximum line-to-tape power delta P 'of non-fault electrode layer'∑maxL＝VL_1_x′×(PLmax-PL0_1_x′)+VL_2_x′×(PLmax-PL0_2_x′)；
Obtaining fault measure quantity of safety control system of flexible direct current power gridΔPtrans＝min{ΔP’S_i_max，ΔP’∑maxM，ΔP’∑maxL}；
Amount of faulty measure Ptrip＝ΔP-ΔPtrans。
The method ensures that the safety control system of the flexible direct-current power grid can calculate the correct fault measure amount when the converter locking fault occurs, and can effectively ensure the safe and stable operation of the flexible direct-current power grid.
Claims (6)
1. A method of obtaining a soft dc grid converter lockout fault measure quantity, the method comprising:
determining a flexible direct current power grid security control system topological structure;
acquiring calculation data of the blocking fault measure quantity of the converter of the safety control system of the flexible direct current power grid according to the topological structure;
defining a measure quantity of the converter locking fault of the soft direct current power grid security control system according to the converter locking fault to calculate a variable;
acquiring the blocking fault measure quantity of the current converter according to the calculation data and the calculation variable;
the calculating the fault measure quantity according to the calculation data and the calculation variable specifically includes:
the converter Si _ x is locked, and the effective bit V of the converter is then lockedS_i_xIs set to 0 by 1, where x ═ P, N, and x' is defined as x, inverted, i.e., x ═ P when x ═ N, x ═ N when x ═ P;
determining the system imbalance power Δ P ═ P caused by the blocking converter Si _ xS0_i_x；
Calculating non-fault pole layer converter Si_x′Is the maximum strip power delta P'S_i_max＝ΔPS_i_x′＝VS_i_x′×(PSmax_i_x′-PS0_i_x′)；
Obtaining maximum strip power quantity delta P 'of non-fault electrode layer'∑maxM＝VS_3_x′×(PSmax_3_x′-PS0_3_x′)+VS_4_x′×(PSmax_4_x′-PS0_4_x′)；
Obtaining non-fault layer line maximumWind power Δ P'∑maxL＝VL_1_x′×(PLmax-PL0_1_x′)+VL_2_x′×(PLmax-PL0_2_x′)；
Obtaining fault measure quantity delta P of safety control system of flexible direct current power gridtrans＝min{ΔP′S_i_max，ΔP′∑maxM，ΔP′∑maxL}；
Amount of faulty measure Ptrip＝ΔP-ΔPtrans；
The calculating data includes:
a converter station Si, where i is the ith converter station, and i is 1,2,3, 4.. n;
variable of a converter Si _ P of the converter station Si positive electrode layer: maximum power PSmax_i_POperating power before failure PS0_i_PMaximum band-rotating power quantity delta PS_i_PAnd a valid bit VS_i_P；
Variable of a converter station Si cathode layer converter Si _ N: maximum power PSmax_i_NOperating power before failure PS0_i_NMaximum band-rotating power quantity delta PS_i_NAnd VS_i_NA valid bit;
a line Li, where i is the ith direct current transmission line, and i is 1,2,3, 4.. n;
variable of transmission line Li _ P of Li positive electrode layer of line: maximum power PLmaxInitial operating power PL0_i_PAnd a valid bit VL_i_P；
Variable of transmission line Li _ N on Li negative pole layer of line: maximum power PLmaxInitial operating power PL0_i_NAnd a valid bit VL_i_N；
And all variables of the converter station Si and the line Li are set to be 1 in an operation valid position, and 0 in an exit valid position.
2. The method of claim 1, wherein the flexible direct current power grid safety control system topology comprises: the flexible direct-current power grid security control system is of a true bipolar topological structure and the flexible direct-current power grid security control system is of a true unipolar topological structure.
3. The method of claim 1, the defined computational variables comprising:
the system unbalanced power is delta P, and the maximum strip-rotating power of the non-fault pole layer converter is delta P'S_i_maxThe maximum strip power of the non-fault electrode layer is delta P'∑maxMThe maximum strip power of the non-fault electrode layer line is delta P'∑maxLObtaining the fault measure quantity of the safety control system of the flexible direct current power grid as delta PtransAnd the quantity of faulty measures is Ptrip。
4. A system for obtaining a soft dc grid converter lockout fault measure quantity, the system comprising:
determining a topological structure module, and determining a topological structure of the safety control system of the flexible direct current power grid;
the data acquisition module is used for acquiring calculation data of the locking fault measure quantity of the current converter of the safety control system of the flexible direct current power grid according to the topological structure;
the variable obtaining module is used for defining a flexible direct current power grid safety control system converter locking fault measure quantity calculation variable according to the converter locking fault;
the fault measure quantity obtaining module is used for obtaining the converter locking fault measure quantity according to the calculation data and the calculation variable;
the calculating the fault measure quantity according to the calculation data and the calculation variable specifically includes:
the converter Si _ x is locked, and the effective bit V of the converter is then lockedS_i_xIs set to 0 by 1, where x ═ P, N, and x' is defined as x, inverted, i.e., x ═ P when x ═ N, x ═ N when x ═ P;
determining the system imbalance power Δ P ═ P caused by the blocking converter Si _ xS0_i_x；
Calculating non-fault pole layer converter Si_x′Is the maximum strip power delta P'S_i_max＝ΔPS_i_x′＝VS_i_x′×(PSmax_i_x′-PS0_i_x′)；
Obtaining maximum strip power quantity delta P 'of non-fault electrode layer'∑maxM＝VS_3_x′×(PSmax_3_x′-PS0_3_x′)+VS_4_x′×(PSmax_4_x′-PS0_4_x′)；
Obtaining maximum line-to-tape power delta P 'of non-fault electrode layer'∑maxL＝VL_1_x′×(PLmax-PL0_1_x′)+VL_2_x′×(PLmax-PL0_2_x′)；
Obtaining fault measure quantity delta P of safety control system of flexible direct current power gridtrans＝min{ΔP’S_i_max，ΔP’∑maxM，ΔP’∑maxL}；
Amount of faulty measure Ptrip＝ΔP-ΔPtrans；
Wherein calculating the data comprises:
a converter station Si, where i is the ith converter station, and i is 1,2,3, 4.. n;
variable of a converter Si _ P of the converter station Si positive electrode layer: maximum power PSmax_i_POperating power before failure PS0_i_PMaximum band-rotating power quantity delta PS_i_PAnd a valid bit VS_i_P；
Variable of a converter station Si cathode layer converter Si _ N: maximum power PSmax_i_NOperating power before failure PS0_i_NMaximum band-rotating power quantity delta PS_i_NAnd VS_i_NA valid bit;
a line Li, where i is the ith direct current transmission line, and i is 1,2,3, 4.. n;
variable of transmission line Li _ P of Li positive electrode layer of line: maximum power PLmaxInitial operating power PL0_i_PAnd a valid bit VL_i_P；
Variable of transmission line Li _ N on Li negative pole layer of line: maximum power PLmaxInitial operating power PL0_i_NAnd a valid bit VL_i_N；
And all variables of the converter station Si and the line Li are set to be 1 in an operation valid position, and 0 in an exit valid position.
5. The system of claim 4, wherein the grid-based flexible safety control system topology comprises: the flexible direct-current power grid security control system is of a true bipolar topological structure and the flexible direct-current power grid security control system is of a true unipolar topological structure.
6. The system of claim 4, said defined computational variables comprising:
the system unbalanced power is delta P, and the maximum strip-rotating power of the non-fault pole layer converter is delta P'S_i_maxThe maximum strip power of the non-fault electrode layer is delta P'∑maxMThe maximum strip power of the non-fault electrode layer line is delta P'∑maxLThe fault measure quantity of the safety control system of the flexible direct-current power grid is delta PtransAnd the quantity of faulty measures is Ptrip。
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