CN109659934B - New energy grid-connected planning optimization method based on short-circuit current margin - Google Patents
New energy grid-connected planning optimization method based on short-circuit current margin 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The invention provides a new energy grid-connected planning optimization method based on a short-circuit current margin. The new energy grid-connected planning optimization method based on the short-circuit current margin effectively avoids the problems of line overload, voltage out-of-limit and the like of a near-region system after new energy is intensively connected to the grid. And finally, comprehensively and preferably selecting a grid-connected planning scheme by combining factors such as the system safety and stability evaluation result, the economy and the like. The method is simple and rapid, provides practical guidance suggestions for power system operation and planning personnel, avoids the problem that the short-circuit current of a grid-connected point exceeds the standard after large-scale new energy is intensively accessed, and improves the safety and stability of power system operation.
Description
Technical Field
The invention relates to the technical field of high-voltage power grids, in particular to a new energy grid-connected planning optimization method based on a short-circuit current margin.
Background
The short-circuit current calculation is calculation and analysis work which is necessary to be carried out in the planning, design and operation of the power system. The exceeding of the short-circuit current may destroy the safety of the power grid and even cause the breakdown of the whole interconnected system.
In recent years, China highly pays attention to the development and utilization of renewable energy sources such as wind power, solar energy and the like, and the development and utilization of new energy sources are taken as important measures for improving energy structure, promoting environmental protection and maintaining economic and social sustainable development. With the increase of the scale of the concentrated grid-connected new energy, the influence of the new energy on the short-circuit current of the concentrated grid-connected point is not negligible.
At present, whether the short-circuit current of a grid-connected point exceeds the standard or not is not considered in new energy grid-connected planning.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a new energy grid-connected planning optimization method based on a short-circuit current margin, which provides practical guidance suggestions for power system operation and planning personnel, avoids the problem that the short-circuit current of a grid-connected point exceeds the standard after large-scale new energy is intensively accessed, and improves the safety and stability of power system operation.
The invention provides a new energy grid-connected planning optimization method based on a short-circuit current margin, which comprises the following steps of:
a: providing a plurality of grid-connected planning schemes;
b: selecting one grid-connected planning scheme, and acquiring a short-circuit current margin index Igt of each voltage grade bus at a concentrated grid-connected point under the selected grid-connected planning scheme;
c: establishing a simulation model of a grid-connected planning scheme;
d: carrying out simulation operation on the grid-connected planning scheme to obtain a short-circuit current margin value Ig of each voltage grade bus at the centralized grid-connected point;
e: comparing the short-circuit current margin value Ig with the short-circuit current margin index Igt, if the short-circuit current margin value Ig is smaller than the short-circuit current margin index Igt, entering step F, and if the short-circuit current margin value Ig is larger than or equal to the short-circuit current margin index Igt, entering step G;
f: optimizing the grid-connected planning scheme, and repeating the steps C-E after the optimization is completed;
g: evaluating the safety and stability of the system for the grid-connected planning scheme;
h: if the evaluation result is feasible, the selected grid-connected planning scheme is reserved and the next step is carried out, and if the evaluation result is infeasible, the selected grid-connected planning scheme is deleted and the step B is carried out;
i: repeating the steps B-H until each grid-connected planning scheme in the step A is processed in a reserved or deleted mode;
j: and selecting an optimal grid-connected planning scheme from the plurality of reserved grid-connected planning schemes.
Further, in the step F, the method for optimizing the grid-connected planning scheme includes: and the installed capacity of the new energy is reduced according to the step length, each new energy electric field is connected in series and then is connected to the grid or part of new energy units are connected to other grid-connected points.
Further, in the step G, the system safety and stability evaluation specifically includes the following steps:
g1: performing system static N-1 checking analysis on the grid-connected planning scheme;
g2: carrying out system transient N-1 checking analysis on the grid-connected planning scheme;
g3: and analyzing the system voltage fluctuation of the grid-connected planning scheme.
Further, the step G1 specifically includes the following steps:
g1.1: in the simulation model, setting a power grid as a low-ebb load, setting a grid-connected new energy unit as a maximum output, and setting a grid-connected near-region conventional unit as a full output;
g1.2: carrying out simulation operation on the grid-connected planning scheme, and calculating an active power value Pi of a main transformer or a line in a near area of grid connection;
g1.3: obtaining an active power limit value Pmaxi of a main transformer or a line in a grid-connected near area;
g1.4: if the active power value Pi of the grid-connected near-area main transformer or the line is larger than the active power limiting value Pmaxi of the grid-connected near-area main transformer or the line, the step H is carried out, and the evaluation result is infeasible; and G2 is entered if the active power value Pi of the grid-connected near-zone main transformer or the line is less than or equal to the active power limit value Pmaxi of the grid-connected near-zone main transformer or the line.
Further, the step G2 specifically includes the following steps:
g2.1: in the simulation model, setting a power grid as a peak load, setting a grid-connected new energy set as a maximum output, setting a grid-connected near-area conventional set as a full output, and respectively setting a grid-connected near-area line and a transformer as a three-phase permanent N-1 fault;
g2.2: carrying out simulation operation on the grid-connected planning scheme;
g2.3: if any one of power angle instability, voltage instability and frequency instability occurs, entering the step H, and the evaluation result is not feasible; if any of the power angle instability, the voltage instability and the frequency instability does not occur, the step G3 is entered.
Further, the step G3 specifically includes the following steps:
g3.1: in the simulation model, setting a power grid as a low-ebb load, setting a grid-connected new energy source unit as 0 output, setting a grid-connected near-area conventional unit as full output, and setting the switching capacity of static reactive compensation equipment in the power grid to be kept unchanged in the simulation process;
g3.2: carrying out simulation operation on the grid-connected planning scheme, and calculating a first voltage value Umaxi of each bus in a grid-connected near area;
g3.3: setting the grid-connected new energy source unit as the maximum output;
g3.4: carrying out simulation operation on the grid-connected planning scheme, and calculating a second voltage value Umini of each bus in a grid-connected near area;
g3.5: calculating a voltage fluctuation value Ubdi of each bus in a grid-connected near area according to the first voltage value Umaxi and the second voltage value Umini;
g3.6: if the voltage fluctuation value Ubdi is larger than 10%, entering a step H, and judging that the evaluation result is not feasible; and if the voltage fluctuation value Ubdi is less than or equal to 10%, entering a step H, and enabling an evaluation result.
Further, in the step J, the multiple reserved grid-connected planning schemes are comprehensively evaluated at multiple angles, and an optimal grid-connected planning scheme is selected according to the comprehensive evaluation result.
The new energy grid-connected planning optimization method based on the short-circuit current margin provides practical guidance suggestions for power system operation and planning personnel, avoids the problem that the short-circuit current of a grid-connected point exceeds the standard after large-scale new energy is intensively accessed, and improves the operation safety and stability of a power system.
Drawings
FIG. 1 is a flow chart of a new energy grid-connected planning optimization method based on a short-circuit current margin;
FIG. 2 is a schematic diagram of a grid-connected design scheme of a wind power plant provided by the invention;
FIG. 3 is a schematic diagram of a grid-connected design scheme II of a certain wind power plant provided by the invention;
FIG. 4 is a schematic diagram of a grid-connected design scheme of a wind power plant provided by the invention;
FIG. 5 is a diagram of a grid-connected design scheme for a wind farm according to the present invention;
FIG. 6 is a schematic diagram of a fifth design scheme for grid connection of a wind farm provided by the invention;
FIG. 7 is a preferred result table of a certain wind farm grid-connected design scheme provided by the invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
A new energy grid-connected planning optimization method based on a short-circuit current margin is disclosed, as shown in FIG. 1, and comprises the following steps:
early preparation work: and (3) researching and collecting regional power grid data, a new energy electric field grid-connected design scheme and data related to each bus circuit breaker of a centralized grid-connected point. The method specifically comprises the following steps: the present situation and planning data of the regional power grid are investigated, which comprises: grid structure, generator parameters, load parameters, line parameters, transformer parameters, and the like; the present situation and planning data of each new energy electric field are investigated, which includes: the method comprises the following steps of (1) new energy electric field installed capacity, new energy unit types and parameters thereof, new energy grid-connected design scheme, boosting variable parameters, grid-connected line parameters and the like; and (4) researching and centralizing the on-off current value Imaxi of the circuit breaker of each voltage grade bus of the grid-connected point, and determining the short-circuit current margin index Igt of each bus.
A: and providing a plurality of grid-connected planning schemes.
B: and selecting one grid-connected planning scheme, and acquiring a short-circuit current margin index Igt of each voltage grade bus at a concentrated grid-connected point under the selected grid-connected planning scheme.
C: and establishing a simulation model of the grid-connected planning scheme.
D: carrying out simulation operation on the grid-connected planning scheme to obtain a short-circuit current margin value Ig of each voltage grade bus at the concentrated grid-connected point:
in particular, the amount of the solvent to be used,
simulation operation, namely calculating the short-circuit current value Ii of each voltage level bus at a centralized grid-connected point under a grid-connected planning scheme;
calculating a path current margin value Ig according to the bus breaker open current value Imaxi and the short circuit current value Ii according to the following formula;
Ig=1-(Ii/Imaxi)*100%。
e: and comparing the short-circuit current margin value Ig with the short-circuit current margin index Igt, entering the step F if the short-circuit current margin value Ig is smaller than the short-circuit current margin index Igt, and entering the step G if the short-circuit current margin value Ig is larger than or equal to the short-circuit current margin index Igt.
F: and C, optimizing the grid-connected planning scheme, and repeating the steps C to E after the optimization is completed.
The method for optimizing the grid-connected planning scheme comprises the following steps: and the installed capacity of the new energy is reduced according to the step length, each new energy electric field is connected in series and then is connected to the grid or part of new energy units are connected to other grid-connected points.
G: and (3) evaluating the safety and stability of the system for the grid-connected planning scheme:
g1: performing system static N-1 checking analysis on the grid-connected planning scheme:
g1.1, setting a power grid as a low-ebb load, setting a grid-connected new energy unit as a maximum output and setting a grid-connected near-region conventional unit as a full output in a simulation model;
g1.2, carrying out simulation operation on the grid-connected planning scheme, and calculating an active power value Pi of a main transformer or a line in a near area of grid connection;
g1.3, obtaining an active power limit value Pmaxi of a main transformer or a line in a grid-connected near area, wherein the active power limit value Pmaxi can be determined according to the model of each line and each transformer;
g1.4, if the active power value Pi of the grid-connected near-area main transformer or the line is greater than the active power limit value Pmaxi of the grid-connected near-area main transformer or the line, entering a step H, and judging that the evaluation result is not feasible; and G2 is entered if the active power value Pi of the grid-connected near-zone main transformer or the line is less than or equal to the active power limit value Pmaxi of the grid-connected near-zone main transformer or the line.
G2: carrying out system transient N-1 checking analysis on the grid-connected planning scheme:
g2.1: in the simulation model, setting a power grid as a peak load, setting a grid-connected new energy set as a maximum output, setting a grid-connected near-area conventional set as a full output, and respectively setting a grid-connected near-area line and a transformer as a three-phase permanent N-1 fault;
g2.2: carrying out simulation operation on the grid-connected planning scheme;
g2.3: if any one of power angle instability, voltage instability and frequency instability occurs, entering the step H, and the evaluation result is not feasible; if any of the power angle instability, the voltage instability and the frequency instability does not occur, the step G3 is entered.
G3: carrying out system voltage fluctuation analysis on the grid-connected planning scheme:
g3.1: in the simulation model, setting a power grid as a low-ebb load, setting a grid-connected new energy source unit as 0 output, setting a grid-connected near-area conventional unit as full output, and setting the switching capacity of static reactive compensation equipment in the power grid to be kept unchanged in the simulation process;
g3.2: carrying out simulation operation on the grid-connected planning scheme, and calculating a first voltage value Umaxi of each bus in a grid-connected near area;
g3.3: setting the grid-connected new energy source unit as the maximum output;
g3.4: carrying out simulation operation on the grid-connected planning scheme, and calculating a second voltage value Umini of each bus in a grid-connected near area;
g3.5: calculating a voltage fluctuation value Ubdi of each bus in a grid-connected near area according to the first voltage value Umaxi and the second voltage value Umini;
g3.6: if the voltage fluctuation value Ubdi is larger than 10%, entering a step H, and judging that the evaluation result is not feasible; and if the voltage fluctuation value Ubdi is less than or equal to 10%, entering a step H, and enabling an evaluation result.
H: and if the evaluation result is feasible, the selected grid-connected planning scheme is reserved and the next step is carried out, and if the evaluation result is infeasible, the selected grid-connected planning scheme is deleted and the step B is carried out.
I: and D, repeating the steps B-H until each grid-connected planning scheme in the step A is processed in a reserved or deleted mode.
J: and selecting an optimal grid-connected planning scheme from the plurality of reserved grid-connected planning schemes, specifically, comprehensively evaluating the plurality of reserved grid-connected planning schemes from multiple angles such as reliability, economy and the like, and selecting the optimal grid-connected planning scheme according to the comprehensive evaluation result.
In the embodiment, firstly, short-circuit current evaluation is carried out on buses of each voltage grade of a centralized grid-connected point under a grid-connected planning scheme, whether the short-circuit current of each bus of the grid-connected point exceeds the standard or not is judged according to a short-circuit current margin index Igt, grid-connected capacity and a grid-connected mode of a new energy electric field are optimized and adjusted according to a judgment result, and safety stability evaluation such as static state N-1, transient state N-1, voltage fluctuation and the like of a system after centralized grid connection is finished on the basis, so that the problems of line overload, voltage out-of-limit and the like of a near-region system after centralized grid connection of new energy are effectively avoided. And finally, comprehensively and preferably selecting a grid-connected planning scheme by combining factors such as the system safety and stability evaluation result, the economy and the like. The method is simple and rapid, provides practical guidance suggestions for power system operation and planning personnel, avoids the problem that the short-circuit current of a grid-connected point exceeds the standard after large-scale new energy is intensively accessed, and improves the safety and stability of power system operation.
In order to make the use method of the present embodiment clearer, practical examples are taken to enhance understanding.
Planning installed capacity of 150MW for a certain wind power plant WF, accessing a power grid of a certain area with 110kV voltage level, and referring to the drawings in FIGS. 2-6, which are pre-selected grid-connected design drawings of the wind power plant, wherein the cut-off current of a 110kV bus breaker of the power grid of the area is 31.5kA, and the short-circuit current margin index Igt is set to be 10%. The optimal result of each grid-connected planning scheme is shown in fig. 7 by applying a short-circuit current margin-based new energy grid-connected planning optimal selection method. The first scheme and the fourth scheme have the problems of grid-connected near-region line overload and near-region bus voltage fluctuation out-of-limit in system safety and stability evaluation respectively, so that the problems are deleted in the step H; in addition, under the second scheme, the fan grid-connected capacity is optimized under the limitation requirement of the grid-connected point short circuit current margin index, the optimized fan grid-connected capacity is smaller, and the generated social benefit and economic benefit are poorer; compared with the third scheme, the fifth scheme has longer grid-connected line length of the wind power plant and slightly poor economic benefit. Therefore, in the step J, the third scheme is comprehensively and preferably selected as the wind power integration planning scheme.
The scope of the invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (7)
1. A new energy grid-connected planning optimization method based on a short-circuit current margin is characterized by comprising the following steps:
a: providing a plurality of grid-connected planning schemes;
b: selecting one grid-connected planning scheme, and acquiring a short-circuit current margin index Igt of each voltage grade bus at a concentrated grid-connected point under the selected grid-connected planning scheme;
c: establishing a simulation model of a grid-connected planning scheme;
d: carrying out simulation operation on the grid-connected planning scheme to obtain a short-circuit current margin value Ig of each voltage grade bus at the centralized grid-connected point;
e: comparing the short-circuit current margin value Ig with the short-circuit current margin index Igt, if the short-circuit current margin value Ig is smaller than the short-circuit current margin index Igt, entering step F, and if the short-circuit current margin value Ig is larger than or equal to the short-circuit current margin index Igt, entering step G;
f: optimizing the grid-connected planning scheme, and repeating the steps C-E after the optimization is completed;
g: evaluating the safety and stability of the system for the grid-connected planning scheme;
h: if the evaluation result is feasible, the selected grid-connected planning scheme is reserved and the next step is carried out, and if the evaluation result is infeasible, the selected grid-connected planning scheme is deleted and the step B is carried out;
i: repeating the steps B-H until each grid-connected planning scheme in the step A is processed in a reserved or deleted mode;
j: and selecting an optimal grid-connected planning scheme from the plurality of reserved grid-connected planning schemes.
2. The method for optimizing the new energy grid-connected planning based on the short-circuit current margin as claimed in claim 1, wherein in the step F, the method for optimizing the grid-connected planning scheme is as follows: and the installed capacity of the new energy is reduced according to the step length, and each new energy electric field is connected in series and then is connected to the grid or part of new energy units are connected to other grid-connected points.
3. The short-circuit current margin-based new energy grid-connected planning optimization method according to claim 1, wherein in the step G, the system safety and stability assessment specifically comprises the following steps:
g1: performing system static N-1 checking analysis on the grid-connected planning scheme;
g2: carrying out system transient N-1 checking analysis on the grid-connected planning scheme;
g3: and analyzing the system voltage fluctuation of the grid-connected planning scheme.
4. The method for optimizing the grid-connected planning of the new energy based on the short-circuit current margin as claimed in claim 3, wherein the step G1 specifically includes the following steps:
g1.1: in the simulation model, setting a power grid as a low-ebb load, setting a grid-connected new energy unit as a maximum output, and setting a grid-connected near-region conventional unit as a full output;
g1.2: carrying out simulation operation on the grid-connected planning scheme, and calculating an active power value Pi of a main transformer or a line in a near area of grid connection;
g1.3: obtaining an active power limit value Pmaxi of a main transformer or a line in a grid-connected near area;
g1.4: if the active power value Pi of the grid-connected near-area main transformer or the line is larger than the active power limiting value Pmaxi of the grid-connected near-area main transformer or the line, the step H is carried out, and the evaluation result is infeasible; and G2 is entered if the active power value Pi of the grid-connected near-zone main transformer or the line is less than or equal to the active power limit value Pmaxi of the grid-connected near-zone main transformer or the line.
5. The method for optimizing the grid-connected planning of the new energy based on the short-circuit current margin as claimed in claim 3, wherein the step G2 specifically includes the following steps:
g2.1: in the simulation model, setting a power grid as a peak load, setting a grid-connected new energy set as a maximum output, setting a grid-connected near-area conventional set as a full output, and respectively setting a grid-connected near-area line and a transformer as a three-phase permanent N-1 fault;
g2.2: carrying out simulation operation on the grid-connected planning scheme;
g2.3: if any one of power angle instability, voltage instability and frequency instability occurs, entering the step H, and the evaluation result is not feasible; if any of the power angle instability, the voltage instability and the frequency instability does not occur, the step G3 is entered.
6. The method for optimizing the grid-connected planning of the new energy based on the short-circuit current margin as claimed in claim 3, wherein the step G3 specifically includes the following steps:
g3.1: in the simulation model, setting a power grid as a low-ebb load, setting a grid-connected new energy source unit as 0 output, setting a grid-connected near-area conventional unit as full output, and setting the switching capacity of static reactive compensation equipment in the power grid to be kept unchanged in the simulation process;
g3.2: carrying out simulation operation on the grid-connected planning scheme, and calculating a first voltage value Umaxi of each bus in a grid-connected near area;
g3.3: setting the grid-connected new energy source unit as the maximum output;
g3.4: carrying out simulation operation on the grid-connected planning scheme, and calculating a second voltage value Umini of each bus in a grid-connected near area;
g3.5: calculating a voltage fluctuation value Ubdi of each bus in a grid-connected near area according to the first voltage value Umaxi and the second voltage value Umini;
g3.6: if the voltage fluctuation value Ubdi is larger than 10%, entering a step H, and judging that the evaluation result is not feasible; and if the voltage fluctuation value Ubdi is less than or equal to 10%, entering a step H, and enabling an evaluation result.
7. The short-circuit current margin-based new energy grid-connected planning optimization method according to claim 1, wherein in the step J, comprehensive evaluation is performed on a plurality of reserved grid-connected planning schemes from multiple angles, and an optimal grid-connected planning scheme is selected according to a comprehensive evaluation result.
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| CN112417643B (en) * | 2020-10-13 | 2023-05-30 | 国网山东省电力公司电力科学研究院 | Thermal power generating unit maximum output real-time evaluation method and system based on blower current |
| CN112800683B (en) * | 2021-03-10 | 2023-02-07 | 广东电网有限责任公司电力调度控制中心 | System short-circuit current level evaluation method and system based on convolutional neural network |
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| 计及短路电流限制的输电网双层扩展规划模型;宋柄兵 等;《电工技术学报》;20160410;第31卷(第7期);全文 * |
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