CN107332236B - Power grid load transfer method based on global search - Google Patents
Power grid load transfer method based on global search 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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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Abstract
The invention discloses a power grid load transfer method based on global search, which comprises the following steps of 1, obtaining power grid model data and state estimation data, and enabling a power grid to be equivalent to an undirected authorized graph according to the power grid model data and the state estimation data; step 2, calculating the maximum power supply capacity of the bus; step 3, searching a feasible transfer path of the bus according to the power grid model data and the state estimation data obtained in the step 1; and 4, acquiring the information of the voltage-loss bus, and acquiring a feasible transfer path of the voltage-loss bus according to the feasible load transfer path of the bus acquired in the step 3, wherein the feasible transfer path is used as a final load transfer scheme. According to the method, a feasible power transmission line switching path and a bus coupler switch switching path can be found after the voltage of the substation bus is lost, the load switching scheme under the voltage loss accident of the substation bus can be rapidly and effectively worked out through the method, the management and control capability of a dispatcher on a power grid is improved, and the safe and stable work of the power grid is guaranteed.
Description
Technical Field
The invention relates to the field of intelligent power grid dispatching.
Background
In recent years, with the continuous increase of national economy of China, the demand of various industries on electric power is rapidly increased, but the problems of unreasonable power grid structure and the like are prominent because the construction of urban power grids is relatively lagged, and the requirements of users on electric energy quality, power supply reliability and the like are difficult to meet. Particularly, due to the rise of the third industry, the structure of the power load is changed, and the electricity utilization proportion of medium and small users including residents is increased year by year, so that the lines in the urban power distribution system are longer and longer, more and more nodes are provided, the structure is more and more complex, and the failure probability is correspondingly increased.
When the power grid fails, the fault equipment needs to be removed as soon as possible, then the power supply to the user load needs to be recovered as soon as possible, and the range of the influence of power failure is reduced as far as possible, so that the social influence, economic loss and the like caused by power failure are greatly reduced, meanwhile, the loss of the power supply network after the fault is processed is reduced as far as possible, the power supply reliability is improved, and the load is distributed in a balanced manner.
Based on the above requirements, it is urgently needed to find a method to solve the problem of load reduction and supply caused by equipment overload and fault at present, and realize load transfer and supply under fault.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a power grid load transfer method based on global search, solve the current load reduction problem caused by equipment overload and faults, and realize load transfer under the faults.
In order to solve the technical problems, the invention adopts the following technical scheme: a power grid load transfer method based on global search comprises the following steps,
the method comprises the following steps that a bus of a power grid is equivalent to the vertex of an undirected weighted graph, active power of a feeder line segment and a distribution transformer is equivalent to the load of the bus, active power of a generator is equivalent to the output of the bus, a power transmission line of the power grid is equivalent to the edge of the undirected weighted graph, and the reactance of the power transmission line is used as the weight of the corresponding edge of the undirected weighted graph;
step 3, searching a feasible transfer path of the bus according to the power grid model data and the state estimation data obtained in the step 1, and specifically comprises the following steps:
step 31, carrying out global search on the power grid model data, searching a power transmission line connected with a certain bus and an opposite-end bus, determining the maximum power supply capacity of the opposite-end bus according to the maximum power supply capacity of the bus obtained by calculation in the step 2, and if the conditions that the power transmission line is disconnected and the maximum power supply capacity of the opposite-end bus is greater than the load of the bus are met, the power transmission line and the opposite-end bus are a feasible power transmission line switching path of the bus; repeating the step to obtain all feasible transmission lines of all buses in the power grid and transfer paths of the buses at the opposite end;
step 32, carrying out global search on the power grid model data, searching the bus coupler switch and the opposite-end bus connected with the bus in the step 31, determining the maximum power supply capacity of the opposite-end bus according to the maximum power supply capacity of the bus calculated in the step 2, and if the bus coupler switch is not connected and the maximum power supply capacity of the opposite-end bus is greater than the load of the bus, the bus coupler switch and the opposite-end bus are a feasible bus coupler switch transfer path of the bus; repeating the steps to obtain all feasible bus-coupled switches and transfer paths of the opposite-end buses in the power grid;
step 33, storing all feasible load transfer paths of all buses in the power grid obtained in the steps 31 and 32; and 4, acquiring the information of the voltage-loss bus, and acquiring a feasible transfer path of the voltage-loss bus according to the feasible load transfer path of the bus acquired in the step 3, wherein the feasible transfer path is used as a final load transfer scheme.
Preferably, the step of calculating the maximum power supply capacity of the bus comprises the following steps:
step 21, reading the initial load value P of the bus0；
Step 22, setting step h to 0.01 × P0Setting a circulation variable i to be 1;
step 23, setting the load value P of the busi＝Pi-1+h；
Step 24, performing load flow calculation on the undirected authorized graph by adopting a direct current method, checking whether the load flow of the edge of the undirected authorized graph exceeds the limit of the undirected authorized graph, and if the load flow of the undirected authorized graph exceeds the limit, the maximum power supply capacity of the bus is Pi-1；
And 25, if the power flow to the edge of the authorized graph does not exceed the limit, adding 1 to the loop variable i, and repeating the step 23 and the step 24.
Preferably, the grid model data and the state estimation data are obtained in step 1 directly from an energy management system of the grid company.
According to the method, a feasible power transmission line switching path and a bus coupler switch switching path can be found after the voltage of the substation bus is lost, the load switching scheme under the voltage loss accident of the substation bus can be rapidly and effectively worked out through the method, the management and control capability of a dispatcher on a power grid is improved, and the safe and stable work of the power grid is guaranteed.
Drawings
The invention is further described with reference to the accompanying drawings and the detailed description below:
fig. 1 is a flowchart of a method for transferring a load of a power grid after a bus of a substation is subjected to voltage loss.
FIG. 2 is a schematic diagram of an embodiment of the Cixi variable load transfer according to the present invention.
Detailed Description
As shown in fig. 1, a power grid load transfer method based on global search includes the following steps:
the method comprises the following steps that a bus of a power grid is equivalent to the vertex of an undirected weighted graph, active power of a feeder line segment and a distribution transformer is equivalent to the load of the bus, active power of a generator is equivalent to the output of the bus, a power transmission line of the power grid is equivalent to the edge of the undirected weighted graph, and the reactance of the power transmission line is used as the weight of the corresponding edge of the undirected weighted graph;
step 3, searching a feasible transfer path of the bus according to the power grid model data and the state estimation data obtained in the step 1, and specifically comprises the following steps:
step 31, carrying out global search on the power grid model data, searching a power transmission line connected with a certain bus and an opposite-end bus, determining the maximum power supply capacity of the opposite-end bus according to the maximum power supply capacity of the bus obtained by calculation in the step 2, and if the conditions that the power transmission line is disconnected and the maximum power supply capacity of the opposite-end bus is greater than the load of the bus are met, the power transmission line and the opposite-end bus are a feasible power transmission line switching path of the bus; repeating the step to obtain all feasible transmission lines of all buses in the power grid and transfer paths of the buses at the opposite end;
step 32, carrying out global search on the power grid model data, searching the bus coupler switch and the opposite-end bus connected with the bus in the step 31, determining the maximum power supply capacity of the opposite-end bus according to the maximum power supply capacity of the bus calculated in the step 2, and if the bus coupler switch is not connected and the maximum power supply capacity of the opposite-end bus is greater than the load of the bus, the bus coupler switch and the opposite-end bus are a feasible bus coupler switch transfer path of the bus; repeating the steps to obtain all feasible bus-coupled switches and transfer paths of the opposite-end buses in the power grid;
step 33, storing all feasible load transfer paths of all buses in the power grid obtained in the steps 31 and 32; and 4, acquiring the information of the voltage-loss bus, and acquiring a feasible transfer path of the voltage-loss bus according to the feasible load transfer path of the bus acquired in the step 3, wherein the feasible transfer path is used as a final load transfer scheme.
The step 2 of calculating the maximum power supply capacity of the bus specifically comprises the following steps:
step 21, reading the initial load value P of the bus0；
Step 22, setting step h to 0.01 × P0Setting a circulation variable i to be 1;
step 23, setting the load value P of the busi＝Pi-1+h；
Step 24, performing load flow calculation on the undirected authorized graph by adopting a direct current method, checking whether the load flow of the edge of the undirected authorized graph exceeds the limit of the undirected authorized graph, and if the load flow of the undirected authorized graph exceeds the limit, the maximum power supply capacity of the bus is Pi-1；
And 25, if the power flow to the edge of the authorized graph does not exceed the limit, adding 1 to the loop variable i, and repeating the step 23 and the step 24.
In addition, the power grid model data and the state estimation data are directly obtained from an Energy Management System (EMS) of the power grid company in step 1.
The specific embodiment is as follows:
as shown in figure 2, the Cixi transformer 220KV positive bus is supplied with power by a Chixi 4P68 line, the Cixi transformer 220KV auxiliary bus is supplied with power by a Chixi 4P67 line, and when the Chixi 4P68 line breaks down, the Cixi transformer 220KV positive bus loses voltage, so that the Cixi transformer 220KV positive bus is reduced in load.
The load transfer method based on global search of the invention is adopted to provide a load transfer scheme: 1. closing the Iphit 2313 line, and transferring the load of the Iphit 220KV positive bus to the Sonce 220KV positive bus; 2. and switching on the Cixi transformer 220KV bus coupler switch, and transferring the load of the Cixi transformer 220KV positive bus to the Cixi transformer 220KV auxiliary bus.
Other embodiments of the present invention than the preferred embodiments described above, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, should fall within the scope of the present invention defined in the claims.
Claims (2)
1. A power grid load transfer method based on global search is characterized by comprising the following steps,
step 1, acquiring power grid model data and state estimation data, equating a power grid into an undirected authorized graph according to the power grid model data and the state estimation data,
the method comprises the following steps that a bus of a power grid is equivalent to the vertex of an undirected weighted graph, active power of a feeder line segment and a distribution transformer is equivalent to the load of the bus, active power of a generator is equivalent to the output of the bus, a power transmission line of the power grid is equivalent to the edge of the undirected weighted graph, and the reactance of the power transmission line is used as the weight of the corresponding edge of the undirected weighted graph;
step 2, calculating the maximum power supply capacity of the bus, comprising the following steps:
step 21, reading a bus initial load value P0;
step 22, setting the step length h to be 0.01 × P0, and setting the loop variable i to be 1;
step 23, setting the load value Pi of the bus to be Pi-1+ h;
step 24, performing load flow calculation on the undirected authorized graph by adopting a direct current method, checking whether the load flow of the edge of the undirected authorized graph exceeds the limit of the undirected authorized graph, and if the load flow of the undirected authorized graph exceeds the limit, setting the maximum power supply capacity of the bus to be Pi-1;
step 25, if the power flow to the edge of the authorized graph does not exceed the limit, adding 1 to the loop variable i, and repeating the step 23 and the step 24;
step 3, searching a feasible transfer path of the bus according to the power grid model data and the state estimation data obtained in the step 1, and specifically comprises the following steps:
step 31, carrying out global search on the power grid model data, searching a power transmission line connected with a certain bus and an opposite-end bus, determining the maximum power supply capacity of the opposite-end bus according to the maximum power supply capacity of the bus obtained by calculation in the step 2, and if the conditions that the power transmission line is disconnected and the maximum power supply capacity of the opposite-end bus is greater than the load of the bus are met, the power transmission line and the opposite-end bus are a feasible power transmission line switching path of the bus; repeating the step to obtain all feasible transmission lines of all buses in the power grid and transfer paths of the buses at the opposite end;
step 32, carrying out global search on the power grid model data, searching the bus coupler switch and the opposite-end bus connected with the bus in the step 31, determining the maximum power supply capacity of the opposite-end bus according to the maximum power supply capacity of the bus calculated in the step 2, and if the bus coupler switch is not connected and the maximum power supply capacity of the opposite-end bus is greater than the load of the bus, the bus coupler switch and the opposite-end bus are a feasible bus coupler switch transfer path of the bus; repeating the steps to obtain all feasible bus-coupled switches and transfer paths of the opposite-end buses in the power grid;
step 33, storing all feasible load transfer paths of all buses in the power grid obtained in the steps 31 and 32;
and 4, acquiring the information of the voltage-loss bus, and acquiring a feasible transfer path of the voltage-loss bus according to the feasible load transfer path of the bus acquired in the step 3, wherein the feasible transfer path is used as a final load transfer scheme.
2. The method according to claim 1, wherein the global search based grid load transfer method comprises,
in step 1, grid model data and state estimation data are directly obtained from an energy management system of a grid company.
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| CN109378815B (en) * | 2018-07-09 | 2022-05-27 | 南方电网科学研究院有限责任公司 | Power distribution network closed loop switching power supply control method, device and equipment |
| CN108808675B (en) * | 2018-07-13 | 2021-04-02 | 广东电网有限责任公司 | Automatic generation method for power supply conversion scheme of voltage-loss distribution network of transformer substation |
| CN109066701B (en) * | 2018-08-09 | 2022-02-22 | 国网浙江省电力有限公司温州供电公司 | Load balancing method and system |
| CN112186746A (en) * | 2020-09-18 | 2021-01-05 | 国网山东省电力公司淄博供电公司 | Method suitable for rapid load transfer of distribution network line of transformer substation |
| CN112165100B (en) * | 2020-09-18 | 2022-04-01 | 国网福建省电力有限公司龙岩供电公司 | Power grid over-supply power online control method and equipment |
| CN113013871A (en) * | 2021-01-25 | 2021-06-22 | 浙江华云信息科技有限公司 | Load transfer method for power distribution network equipment during fault and maintenance |
| CN114614468B (en) * | 2022-05-11 | 2022-08-02 | 广东电网有限责任公司佛山供电局 | Distribution network area load transfer analysis method, system and device |
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| CN105226642B (en) * | 2015-09-22 | 2017-10-13 | 浙江大学 | A kind of power distribution network service restoration method under transformer station's full cut-off accident |
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