CN109378852B - Method and system for acquiring fault measure quantity of direct-current neutral bus of flexible direct-current power grid - Google Patents
Method and system for acquiring fault measure quantity of direct-current neutral bus of flexible direct-current power grid Download PDFInfo
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Abstract
The invention discloses a method and a system for acquiring fault measure quantity of a direct-current neutral bus of a flexible direct-current power grid, and belongs to the technical field of safety and stability control of power systems. The method comprises the following steps: when a converter station SiWhen the DC neutral bus is in fault, the converter Si_xAnd Si_x′Locking; obtaining system unbalanced power delta P (P) caused by direct current neutral busS0_i_P+PS0_i_N(ii) a Acquiring the fault measure quantity of the direct-current neutral bus; and determining the distribution principle of the fault measure quantity of the direct current neutral bus at the two sending end stations. 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 a power system, in particular to a method and a system for acquiring fault measure quantity of a direct current neutral bus 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 is adopted in the flexible direct-current power grid project at present, the safe and stable operation of the flexible direct-current power grid project is guaranteed, and a method for acquiring the fault measure quantity of a direct-current neutral bus of the flexible direct-current power grid is provided and comprises the following steps:
when a converter station SiWhen the DC neutral bus is in fault, the converter Si_xAnd Si_x′Blocking, wherein x is P, N, and x' is defined as inverting x,i.e. x 'is equal to P when x is equal to N and x' is equal to N when x is equal to P, the converter station S is connected to a converter station biConverter valid bit VS_i_xAnd a converter station SiConverter valid bit VS_i_x′Is set to 0 from 1, wherein P is the converter station SiA positive layer converter, N is a converter station SiThe positive layer inverter and i ═ 1,2,3,4 … n;
obtaining system unbalanced power delta P (P) caused by direct current neutral busS0_i_P+PS0_i_NWherein P isS0_i_PFor converter station SiOperating power sum P before fault of positive pole layer converterS0_i_NFor converter station SiOperating power before the fault of the negative layer current converter;
when i is 1 or i is 2, the locked converter is a sending end converter, and the fault measure quantity P of the direct current neutral bus is obtainedtrip＝ΔP＝PS0_i_x+PS0_i_x′，
When i is 3 or 4, the locked converter is a receiving end converter, and the fault measure quantity of the direct current neutral bus is obtained
Wherein, delta P'S_i_maxFor non-fault pole layer converter Si_x′The maximum band-turning power of;
and determining the distribution principle of the fault measure quantity of the direct current neutral bus at the two sending end stations.
Optionally, the allocation principle is:
when i is 1 or i is 2, the locked converter is a sending-end converter, and the direct-current neutral bus fault measure is a unit of the fault converter station;
when i is 3 or i is 4, the locked is a receiving end converter, and the converter station S1The measures for the fault of the direct-current neutral bus are as follows:
converter station S2Dc neutral bus faultThe measure amount is as follows:
optionally, the method further comprises: and determining a flexible direct current power grid security control system topological structure.
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, PtripIf < 0 then Ptrip＝0。
The present invention also provides a system for obtaining a measure quantity of a fault of a dc neutral bus of a flexible dc power grid, the system comprising:
obtaining a variable value module when the converter station SiWhen the DC neutral bus is in fault, the converter Si_xAnd Si_x′Locking, wherein x is P, N, and x ' is defined as x, inverting, i.e. x ' is P when x is N, x ' is N when x is P, inverting the converter station SiConverter valid bit VS_i_xAnd a converter station SiConverter valid bit VS_i_x′Is set to 0 from 1, wherein P is the converter station SiA positive layer converter, N is a converter station SiThe positive layer inverter and i ═ 1,2,3,4 … n;
the power acquisition module acquires system unbalanced power delta P (P) caused by a direct current neutral busS0_i_P+PS0_i_NWherein P isS0_i_PFor converter station SiOperating power sum P before fault of positive pole layer converterS0_i_NFor converter station SiOperating power before the fault of the negative layer current converter;
and the module for acquiring the DC neutral bus fault measure quantity is used for acquiring the DC neutral bus fault measure quantity, when i is 1 or i is 2, the locked converter is a sending end converter, and the DC neutral bus fault measure quantity P is obtainedtrip＝ΔP＝PS0_i_x+PS0_i_x′，
When i is 3 or 4, the locked converter is a receiving end converter, and the fault measure quantity of the direct current neutral bus is obtained
Ptrip＝PS0_1_x+PS0_2_x-VS_3_x×PSmax_3_x-VS_4_x×PSmax_4_x
+PS0_1_x′+PS0_2_x′-VS_3_x′×PSmax_3_x′-VS_4_x′×PSmax_4_x′，
Wherein, delta P'S_i_maxFor non-fault pole layer converter Si_x′The maximum power of the rotating belt of the motor,
and the distribution principle determining module is used for determining the distribution principle of the direct-current neutral bus fault measure quantity at the two sending end stations.
Optionally, the allocation principle is:
when i is 1 or i is 2, the locked converter is a sending-end converter, and the direct-current neutral bus fault measure is a unit of the fault converter station;
when i is 3 or i is 4, the locked is a receiving end converter, and the converter station S1The measures for the fault of the direct-current neutral bus are as follows:
converter station S2The measures for the fault of the direct-current neutral bus are as follows:
optionally, the system further comprises: and the topological structure determining module is used for determining the topological structure of the safety control system of the flexible direct current power grid.
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, PtripIf < 0 then Ptrip＝0。
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 security control system of a flexible direct-current power grid according to a method for obtaining a fault measure quantity of a direct-current neutral bus of the flexible direct-current power grid;
FIG. 2 is a wiring diagram of a flexible direct-current power grid security control system true bipolar topological structure engineering of the method for obtaining the fault measure quantity of the direct-current neutral bus of the flexible direct-current power grid;
FIG. 3 is a flowchart of a method for obtaining a fault measure quantity of a DC neutral bus of a flexible DC power grid according to the present invention;
fig. 4 is a system configuration diagram for acquiring the fault measure quantity of the dc neutral bus of the flexible dc power grid according to the present 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 fault measure quantity of a direct current neutral bus of a flexible direct current power grid, which comprises the following steps of:
confirm gentle direct electric wire netting security control system topological structure, gentle direct electric wire netting security 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.
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.
When a converter station SiWhen the direct current neutral bus fails, the converter locks and acquires the converter variable Si_xAnd Si_x′Where x is P, N, and x ' is defined as x, i.e. x ' is P when x is N and x ' is N when x is P, the converter station S is invertediConverter valid bit VS_i_xAnd a converter station SiConverter valid bit VS_i_x′Is set to 0 from 1, wherein P is the converter station SiA positive layer converter, N is a converter station SiThe positive layer inverter and i ═ 1,2,3,4 … n;
obtaining system unbalanced power delta P (P) caused by direct current neutral busS0_i_P+PS0_i_NWherein P isS0_i_PFor converter station SiOperating power sum P before fault of positive pole layer converterS0_i_NFor converter station SiOperating power before the fault of the negative layer current converter;
when i is 1 or i is 2, the locked converter is a sending end converter, and the fault measure quantity P of the direct current neutral bus is obtainedtrip＝ΔP＝PS0_i_x+PS0_i_x′，
When i is 3 or 4, the locked converter is a receiving end converter, and the fault measure quantity of the direct current neutral bus is obtained
Wherein, delta P'S_i_maxFor non-fault pole layer converter Si_x′The maximum band-turning power of;
determining the distribution principle of the fault measure quantity of the direct-current neutral bus at two sending end stations;
when i is 1 or i is 2, the locked converter is a sending-end converter, and the direct-current neutral bus fault measure is a unit of the fault converter station;
when i is 3 or i is 4, the locked is a receiving end converter, and the converter station S1The measures for the fault of the direct-current neutral bus are as follows:
converter station S2The measures for the fault of the direct-current neutral bus are as follows:
when P is presenttripIf < 0 then Ptrip＝0。
The present invention further provides a system 200 for obtaining a measure quantity of a fault of a dc neutral bus of a flexible dc grid, as shown in fig. 4, including:
and the topological structure determining module 205 determines the topological structure of the safety control system of the flexible direct current power grid.
The gentle direct current electric wire netting security control system topological structure includes: 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;
acquiring variables module 201, when converter station SiWhen the direct current neutral bus fails, the converter locks and acquires the converter variable Si_xAnd Si_x′Where x is P, N, and x ' is defined as x, i.e. x ' is P when x is N and x ' is N when x is P, the converter station S is invertediConverter valid bit VS_i_xAnd a converter station SiConverter valid bit VS_i_x′Is set to 0 from 1, wherein P is the converter station SiA positive layer converter, N is a converter station SiThe positive layer inverter and i ═ 1,2,3,4 … n;
the power obtaining module 202 obtains system unbalanced power Δ P ═ P caused by the dc neutral busS0_i_P+PS0_i_NWherein P isS0_i_PFor converter station SiOperating power sum P before fault of positive pole layer converterS0_i_NFor converter station SiOperating power before the fault of the negative layer current converter;
a module 203 for obtaining the fault measure quantity of the direct current neutral bus, when i is 1 or i is 2, the locked converter is a sending end converter, and the fault measure quantity P of the direct current neutral bustrip＝ΔP＝PS0_i_x+PS0_i_x′，
When i is 3 or 4, the locked converter is a receiving end converter, and the fault measure quantity of the direct current neutral bus is obtained
Ptrip＝PS0_1_x+PS0_2_x-VS_3_x×PSmax_3_x-VS_4_x×PSmax_4_x+PS0_1_x′+PS0_2_x′-VS_3_x′×PSmax_3_x′-VS_4_x′×PSmax_4_x′，
Wherein, delta P's_i_maxFor non-fault pole layer converter Si_x′The maximum power of the rotating belt of the motor,
a determining distribution principle module 204, which determines the distribution principle of the direct current neutral bus fault measure quantity at the two sending end stations;
when i is 1 or i is 2, the locked converter is a sending-end converter, and the direct-current neutral bus fault measure is a unit of the fault converter station;
when i is 3 or i is 4, the locked is a receiving end converter, and the converter station S1The measures for the fault of the direct-current neutral bus are as follows:
converter station S2The measures for the fault of the direct-current neutral bus are as follows:
wherein, PtripIf < 0 then Ptrip＝0。
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 (8)
1. A method of obtaining a flexible direct current grid dc neutral bus fault measure quantity, the method comprising:
when the Si direct current neutral bus of the converter station fails, the converter Si_xAnd Si_x′Locking, wherein x is P, N, and x ' is defined as x, inverting, i.e. x ' is P when x is N, x ' is N when x is P, inverting the converter station SiConverter valid bit VS_i_xAnd a converter station SiConverter valid bit VS_i_x′Is set to 0 from 1, wherein P is the converter station SiA positive layer converter, N being a converter station SiNegative layer converter and i ═ 1,2,3,4 … n, where n is constant and i is SiNumber of；
Obtaining system unbalanced power delta P (P) caused by direct current neutral busS0_i_P+PS0_i_NWherein P isS0_i_PFor converter station SiOperating power sum P before fault of positive pole layer converterS0_i_NFor converter station SiOperating power before the fault of the negative layer current converter;
when i is 1 or i is 2, the locked converter is a sending end converter, and the fault measure quantity P of the direct current neutral bus is obtainedtrip＝ΔP＝PS0_i_x+PS0_i_x′，
When i is 3 or 4, the locked converter is a receiving end converter, and the fault measure quantity of the direct current neutral bus is obtained
Determining the distribution principle of the fault measure quantity of the direct-current neutral bus at two sending end stations;
the distribution principle is as follows:
when i is 1 or i is 2, the locked converter is a sending-end converter, and the direct-current neutral bus fault measure is a unit of the fault converter station;
when i is 3 or i is 4, the locked is a receiving end converter, and the converter station S1The measures for the fault of the direct-current neutral bus are as follows:
converter station S2The measures for the fault of the direct-current neutral bus are as follows:
2. the method of claim 1, further comprising: and determining a flexible direct current power grid security control system topological structure.
3. The method of claim 2, 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.
4. The method of claim 1, said PtripIf < 0 then Ptrip＝0。
5. A system for obtaining a flexible dc grid dc neutral bus fault measure quantity, the system comprising:
obtaining a variable value module when the converter station SiWhen the DC neutral bus is in fault, the converter Si_xAnd Si_x′Locking, where x is P, N, and x ' is defined as x, inverting, i.e. x ' is P when x is N, x ' is N when x is P, inverting the converter station SiConverter valid bit VS_i_xAnd a converter station SiConverter valid bit VS_i_x′Is set to 0 from 1, wherein P is the converter station SiA positive layer converter, N being a converter station SiNegative layer converter and i ═ 1,2,3,4 … n, where n is constant and i is SiThe number of (2);
the power acquisition module acquires system unbalanced power delta P (P) caused by a direct current neutral busS0_i_P+PS0_i_NWherein P isS0_i_PFor converter station SiOperating power sum P before fault of positive pole layer converterS0_i_NFor converter station SiOperating power before the fault of the negative layer current converter;
and the module for acquiring the DC neutral bus fault measure quantity is used for acquiring the DC neutral bus fault measure quantity, when i is 1 or i is 2, the locked converter is a sending end converter, and the DC neutral bus fault measure quantity P is obtainedtrip＝ΔP＝PS0_i_x+PS0_i_x′，
When i is 3 or 4, the locked converter is a receiving end converter, and the fault measure quantity of the direct current neutral bus is obtained
Ptrip＝PS0_1_x+PS0_2_x-VS_3_x×PSmax_3_x-VS_4_x×PSmax_4_x+PS0_1_x′+PS0_2_x′-VS_3_x′×PSmax_3_x′-VS_4_x′×PSmax_4_x′，
The method comprises the steps that a distribution principle module is determined, and the distribution principle of the fault measure quantity of the direct-current neutral bus at two sending end stations is determined;
the distribution principle is as follows:
when i is 1 or i is 2, the locked converter is a sending-end converter, and the direct-current neutral bus fault measure is a unit of the fault converter station;
when i is 3 or i is 4, the locked is a receiving end converter, and the converter station S1The measures for the fault of the direct-current neutral bus are as follows:
converter station S2The measures for the fault of the direct-current neutral bus are as follows:
6. the system of claim 5, further comprising: and the topological structure determining module is used for determining the topological structure of the safety control system of the flexible direct current power grid.
7. The system of claim 6, 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.
8. The system of claim 5, said PtripIf < 0 then Ptrip＝0。
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