CN104734352B - A kind of distribution line Loop Closing Operation control method - Google Patents
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Abstract
The invention discloses a kind of distribution line Loop Closing Operation control method, after main station system judges to need to carry out Loop Closing Operation, send cyclization to interconnection switch from main website and instruct；After the corresponding line feed terminals of interconnection switch receive the cyclization instruction of main website transmission, first confirm that switch for interconnection switch；Then interconnection switch FTU and the FTU peer-to-peer communications of adjacent two switches, obtain the information of voltage at two neighboring switch, are calculated with reference to itself collectable two line voltage information, obtain two other line voltage at interconnection switch；The interconnection switch both sides information of voltage that will be obtained is compared with cyclization definite value, judges whether current system meets Loop Closing Operation condition and carry out associative operation.The method involutive ring condition before interconnection switch closes a floodgate confirmed, ensure that the correctness of Loop Closing Operation in Distribution Network, prevents when not possessing cyclization condition generation cyclization maloperation.Terminal room uses point-to-point peer-to-peer communications mode, and communication delay is small, it is ensured that information transfer it is ageing.
Description
Technical Field
The invention relates to a distribution line loop closing operation control method.
Background
With the rapid development of the construction of the power distribution network, the power distribution network in China basically forms a grid structure with closed-loop design and open-loop operation, namely, a circuit can be powered by a plurality of power supplies, the contact switch is positioned in a separated position during normal operation, and systems on two sides of the contact switch operate in a separated row. When the load is reversed or the line is overhauled, the interconnection switch is closed to enable the line to be closed, then the appropriate section switch is disconnected, power failure of part of the line in short time can be avoided, and power supply reliability is improved. The existing loop closing technology is mainly characterized in that a main station carries out calculation and analysis according to power grid parameters uploaded by a power distribution terminal, whether a system accords with a loop closing condition or not is judged, if yes, a remote closing instruction is sent to a Feeder Terminal (FTU) corresponding to an interconnection switch, and the feeder terminal controls the interconnection switch to be closed after receiving the instruction. However, there is communication delay between the master station and the terminal, and the operation status of the distribution network changes rapidly, and when the terminal receives a switch-on command sent by the master station, the operation status of the system may have changed without a loop closing condition, and if the loop closing operation is executed according to the command, it may cause network circulation power that is difficult to control, resulting in serious consequences such as protection action and equipment damage. Therefore, it is necessary to detect the current system operation parameters by the FTU before controlling the interconnection switch to be switched on, and determine whether to perform a loop closing operation.
During the construction of a distribution line, a single-phase voltage transformer (PT) is generally arranged on each of two sides of a feeder switch to respectively detect AB phase-to-phase voltage and BC phase-to-phase voltage, the PT simultaneously supplies power to an FTU, and the secondary side rated voltage of the feeder switch is 220V. Therefore, the FTU can only acquire one line voltage signal on each of the two sides of the switch, and one line voltage signal is an AB interphase voltage, and the other line voltage signal is a BC interphase voltage, and it is difficult to determine whether a loop closing condition is met through the two line voltage signals. In actual operation, any feeder switch may become a tie switch, and the problem of insufficient voltage signals cannot be solved by adding PT to a certain switch.
The FTU corresponding to the interconnection switch needs to obtain voltage information of other switches to determine whether the system has a loop closing condition. The automatic one-point-to-multipoint communication mode of the traditional power distribution is mainly adopted, namely a master station communicates with all power distribution terminals, information can be exchanged between FTUs through transfer of the master station, and the mode is low in speed, large in delay and difficult to guarantee timeliness of the information. The novel communication mode is point-to-point peer-to-peer communication, namely a feeder line terminal is accessed into the same Ethernet, information can be directly exchanged between any two terminals, and the mode does not need to transfer through a master station, so that the problem of long communication and data processing delay caused by centralized control of the master station is solved. The peer-to-peer communication network can adopt a fiber optic Ethernet network, and research results show that the actual transmission delay of the data transmitted by adopting a connectionless transport layer User Datagram Protocol (UDP) can not exceed 10ms under the appropriate network flow.
Chinese patent ZL201210257852.X discloses a power distribution network loop closing operation control method, wherein a feeder terminal collects voltage signals of a switch, calculates and judges whether a loop can be closed or not, uploads a judgment result to a distribution network main station, and the main station determines whether to execute a closing operation or not according to the terminal uploading result when the loop needs to be closed. The method does not refer to the link of loop closing condition confirmation by the feeder line terminal before closing, and the realization premise is that the terminal can acquire all voltage signals required by calculation, and the method cannot adapt to the actual situation that only one voltage transformer is arranged at each of two sides of a feeder line switch and the voltage signals are insufficient.
Chinese patent 201310156849.3 discloses a method and an apparatus for switching power in a closed loop of a power distribution network, and a power distribution terminal, wherein a station terminal (DTU) determines a closed loop condition before the closed loop, and the method controls a bus closed loop operation in a switching station (switching station), and cannot be used for a power distribution line with insufficient voltage signal collected by the terminal.
Disclosure of Invention
The invention provides a distribution line loop closing operation control method for solving the problems, and the method is characterized in that a feeder terminal confirms that systems on two sides of a tie switch are in a synchronous state before loop closing operation, so that loop closing misoperation is avoided.
In order to achieve the purpose, the invention adopts the following technical scheme:
each terminal (including an in-station terminal RTU) on the feeder line realizes point-to-point communication through the optical fiber Ethernet and exchanges information in a peer-to-peer manner; the master station accesses the peer-to-peer network through the communication processor and communicates with each terminal.
A distribution line loop closing operation control method comprises the following steps:
(1) the master station sends a loop closing instruction to the interconnection switch;
(2) after receiving a loop closing instruction sent by a master station, an FTU corresponding to an interconnection switch firstly judges whether the switch is the interconnection switch; if the connection switch is the connection switch, continuing to execute the step (3), otherwise, locking the loop and reporting to the master station;
(3) the FTU of the interconnection switch is in peer-to-peer communication with the FTUs of the two adjacent section switches to obtain line voltage information of the two adjacent switches, and calculation is carried out by combining the two line voltage information which can be collected by the FTU of the interconnection switch to obtain the other two line voltages of the interconnection switch;
(4) comparing the collected and calculated voltage information at two sides of the interconnection switch with a closed-loop fixed value, and judging whether the current system meets the closed-loop operation condition or not;
(5) if the closed-loop condition is met, executing the closed-loop instruction to control the contact switch to be switched on, and reporting that the master station has executed the switch-on; otherwise, locking the loop closing operation and reporting the result to the master station.
In the step (3), the interconnection switch is marked as N, the front and rear adjacent switches are respectively marked as N-1 and N +1, the switch N-1 is located at the side of the interconnection switch M, the switch N +1 is located at the side of the interconnection switch N, and it is assumed that the side PT of the switch M is connected to the phase AB and the side PT of the switch N is connected to the phase CB.
In the step (2), the condition that the interconnection switch is in the position division is confirmed, and the voltages collected at the two sides of the switch are both greater than a fixed value, namely the conditions are met:
wherein U isM·AB、UN·CBRespectively the amplitude of the line voltage between the phase AB and the phase CB of the interconnection switch M side and the amplitude of the line voltage between the phase CB of the N sideTIs a definite value.
In the step (3), the line voltage information of the adjacent switches is used for calculating the other two line voltages at the interconnection switch, and the calculation formula is as follows:
wherein U isM·CB、UN·ABLine voltage amplitudes U between the M-side CB phase and the N-side AB phase of the interconnection switchn-1·ABAnd Un-1·CBIs the line voltage at switch n-1, Un+1·ABAnd Un+1·CBIs the line voltage at switch n + 1.
Comparing the line voltage information of the two sides of the interconnection switch with the loop closing constant value in the step (4), and judging whether a loop closing condition is met, wherein the specific content comprises the following steps:
a) the line voltage amplitude values on the two sides of the tie switch meet a set value, namely:
Umin＜UL＜Umax
wherein U isLIndicating the respective line voltage at the tie switch, UminTo a defined value, U, under the amplitudemaxDefining a value for the amplitude;
b) the amplitude difference of the line voltages corresponding to the two sides of the switch is smaller than a set value, namely the following conditions are met:
wherein U isthThe amplitude difference setting value can be set to 10V generally;
c) the difference between the two line voltage phases collected by the interconnection switch meets a set value, namely:
wherein,the phase angle of two line voltages is shown, and the phase difference between the line voltage between the CB phase and the line voltage between the AB phase is 60 degrees when the systems on the two sides operate completely at the same time;is a lower limit value of the phase angle difference;is an upper limit value of the phase angle difference.
In the step (4), when the three conditions of the loop closing condition are all satisfied, the systems on the two sides are considered to be in a synchronous state, the interconnection switch is allowed to be switched on, and the loop closing operation is executed; otherwise, the contact switch is forbidden to be switched on, and the loop closing operation is cancelled.
In the step (4), when the line is overhauled or the load is transferred, switching operation is required, and a method of firstly closing the interconnection switch to enable the system to be closed and then disconnecting the section switch is adopted.
The invention has the beneficial effects that:
(1) by adopting the method of firstly closing the interconnection switch to enable the system to be closed and then disconnecting the section switch, the problem of short-time power failure of part of users caused by switching back can be avoided, thereby improving the power supply reliability;
(2) the loop closing operation control method provided by the invention judges whether the systems on the two sides are in the same period before loop closing, and determines that the loop closing operation is carried out in the same period, so that the loop closing misoperation can be effectively avoided;
(3) the feeder line terminal is accessed to the peer-to-peer communication network, point-to-point communication can be realized among the terminals through the peer-to-peer communication network, transfer through a main station is not needed, communication delay is small, and timeliness of information transmission is guaranteed.
Drawings
Fig. 1 is a flow chart of a power distribution network closed loop control method of the invention;
FIG. 2 is a schematic diagram of a typical "hand-in-hand" looped overhead line configuration;
fig. 3 is a schematic diagram of a feeder terminal measuring voltage signal.
The system comprises a PT (potential transformer), FTUs (feeder line switches), CB1 and CB2, wherein the PT is a single-phase voltage transformer, the FTUs are terminals corresponding to feeder line switches, the CB1 and the CB2 are outgoing line switches, S1-S7 are the feeder line switches, S4 is an interconnection switch, the FTUs 1-7 are feeder line terminals corresponding to the feeder line switches respectively, the RTUs 1 and 2 are station terminals corresponding to the outgoing line switches, and the FTUs and the RTUs are connected to a peer-to-peer communication network.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
As shown in fig. 2, the feeder terminals are distributed, and each feeder terminal is used for measurement and control of its own switch, and each feeder terminal (including the terminal RTU in the station) is accessed to the peer-to-peer communication network to exchange real-time information point to point; the master station accesses the peer-to-peer network through the communication processor and can communicate with any terminal. The power distribution network framework is in a closed-loop design and an open-loop operation, a hand-in-hand looped network powered by a double-end power supply is taken as an example, and any feeder switch can be used as a connection switch according to different operation conditions. In fig. 2, the S4 switch corresponding to FTU4 is a tie switch, and in normal operation, S4 is in a separation position, and the system operates in an open loop.
When the line is overhauled or the load is transferred and the switching operation is needed, the method of firstly switching on the interconnection switch and then switching off the section switch is adopted, so that the short-time power failure of part of users caused by switching can be avoided. For example, the transformer of substation M is overloaded, and the load downstream of switch S2 is scheduled to be transferred from substation N. If the switch S2 is opened and then the connection switch S4 is closed, a short-time power failure of the user between S2 and S4 is caused; the interconnection switch S4 is firstly closed to loop the circuit, and then the interconnection switch S2 is disconnected to realize switching, so that no power failure occurs to users in the process, and the power supply reliability is improved.
The operation condition of the power distribution network changes rapidly, because communication delay exists between the main station and the terminal, when the terminal receives a closing instruction, the operation condition of the system may have changed without a loop closing condition, even one side line may have tripped due to a fault, and if a loop closing operation is executed, serious consequences may be caused. Before the loop closing operation is executed, the operating state of the systems on two sides is judged by the corresponding terminal of the contact switch, and whether the systems have loop closing conditions or not is confirmed.
As shown in fig. 3, a single-phase voltage transformer (PT) is generally disposed on each side of the switch in the field, and detects the AB inter-phase voltage and the BC inter-phase voltage respectively. Thus, the terminal FTU4 in fig. 2 can only obtain the line voltage U between the phases AB on the M side of the substationM·ABLine voltage U between N side BC of transformer substationN·BCIt is difficult to determine whether or not the loop closing condition is satisfied from the two pieces of voltage information. The invention provides that the terminal corresponding to the interconnection switch communicates with the feeder terminals of the front and the rear adjacent switches through a peer-to-peer communication network to acquire the voltage information of the adjacent switches at the two sides, and the judgment is carried out by combining the voltage information of the terminal. As shown in fig. 2, FTU4 communicates with FTUs 3, FTU5 through peer-to-peer network, obtains voltage information at switches S3, S5, where the voltage information at S3 is substation M-side line voltage UM·ABAnd UM·BCAnd the voltage information at the S5 is the voltage U of the N side line of the transformer substationN·ABAnd UN·BC。
As shown in fig. 1, the main steps of the power distribution network closed-loop control method provided by the present invention are described as follows with reference to fig. 2:
after a dispatcher or a master station system judges that loop closing operation is needed, the master station sends a loop closing instruction to a feeder terminal FTU4 corresponding to an interconnection switch S4, wherein the loop closing instruction is a remote control loop closing instruction containing a loop closing mark;
after receiving the loop closing instruction, the FTU4 firstly confirms whether the corresponding switch is an interconnection switch; if the connection switch is the connection switch, continuing to execute the step (3), otherwise, locking the loop and reporting to the master station; the condition of confirming the interconnection switch is that the switch is positioned separately and the voltages collected at the two sides of the switch are all larger than a fixed value, namely the requirement of meeting
Wherein U isM·AB、UN·CBRespectively the amplitude of the line voltage between the phase AB and the phase CB of the interconnection switch M side and the amplitude of the line voltage between the phase CB of the N sideTThe voltage is a constant value, and can be generally set to be 0.7 times of rated voltage;
FTU4 directly communicates with FTU3 and FTU5 point-to-point to obtain voltage information at two adjacent switches S3 and S5, and calculates by combining two line voltage information which can be collected by the FTU4 to obtain the other two line voltages at the interconnection switch S4; the calculation formula is as follows:
wherein U isM·CB、UN·ABLine voltage amplitudes U between the M-side CB phase and the N-side AB phase of the interconnection switchS3·ABAnd US3·CBIs the line voltage at switch S3, US5·ABAnd US5·CBIs the line voltage at switch S5.
Comparing the voltage information of the two sides of the interconnection switch S4 with the closed-loop fixed value, and judging whether the current system has closed-loop operation conditions; the criteria include: the line voltage amplitudes at two sides of S4 all meet a set value, the corresponding line voltage amplitude difference at two sides of S4 all is smaller than the set value, and the difference between two line voltage phases acquired at S4 meets the set value; when the three conditions are all met, the system is considered to be in a synchronous state and accords with the loop closing condition;
the three conditions specifically include:
1) the line voltage amplitude values on the two sides of the tie switch meet a set value, namely:
Umin＜UL＜Umax
wherein U isLIndicating the respective line voltage at the tie switch, UminU is a limiting value for the amplitude, which can be set to typically 0.9 times the rated voltagemaxThe amplitude upper limit value is generally set to be 1.1 times of rated voltage;
2) the amplitude difference of the line voltages corresponding to the two sides of the switch is smaller than a set value, namely the following conditions are met:
wherein U isthThe amplitude difference setting value can be set to 10V generally;
3) the difference between the two line voltage phases collected by the interconnection switch meets a set value, namely:
wherein,the phase angle of two line voltages is shown, and the phase difference between the line voltage between the CB phase and the line voltage between the AB phase is 60 degrees when the systems on the two sides operate completely at the same time;the lower limit value of the phase angle difference is set to be 50 degrees in general;the phase angle difference is generally set to a predetermined value of 70 degrees.
If the closed-loop condition is met, executing the closed-loop instruction to control the contact switch to be switched on, and reporting that the master station has executed the switch-on; otherwise, locking the loop closing operation and reporting the result to the master station.
When the other feeder switches operate as tie switches, similar to the case where S4 is a tie switch, no further description is given here. In the same way, the method provided by the invention is also suitable for other looped network forms, including but not limited to multi-segment multi-connection network, single-ring cable network, double-ring cable network, multi-supply and one-standby network frame structures and the like.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (6)
1. A distribution line loop closing operation control method is characterized by comprising the following steps: the method comprises the following steps:
(1) the master station sends a loop closing instruction to the interconnection switch;
(2) after receiving a loop closing instruction sent by a master station, an FTU corresponding to an interconnection switch firstly judges whether the switch is the interconnection switch; if the connection switch is the connection switch, continuing to execute the step (3), otherwise, locking the loop and reporting to the master station;
(3) the FTU of the interconnection switch is in peer-to-peer communication with the FTUs of the two adjacent switches to obtain line voltage information of the two adjacent switches, and calculation is carried out by combining the two line voltage information which can be collected by the FTU of the interconnection switch to obtain the other two line voltages of the interconnection switch; and the calculation formula for calculating the other two line voltages at the interconnection switch by using the adjacent switch line voltage information is as follows:
wherein U isM·CB、UN·CBLine voltage amplitudes of M-side and N-side CB phases of the interconnection switch respectively, wherein UM·AB、UN·ABLine voltage amplitudes U between the M-side AB phase and the N-side AB phase of the interconnection switchn-1·ABAnd Un-1·CBIs the line voltage at switch n-1, Un+1·ABAnd Un+1·CBIs the line voltage at switch n + 1;
(4) comparing the collected and calculated voltage information at two sides of the interconnection switch with a closed-loop fixed value, and judging whether the current system meets the closed-loop operation condition or not;
(5) if the closed-loop condition is met, executing the closed-loop instruction to control the contact switch to be switched on, and reporting that the master station has executed the switch-on; otherwise, locking the loop closing operation and reporting the result to the master station.
2. The method for controlling loop closing operation of distribution line according to claim 1, wherein: in the step (3), the interconnection switch is marked as N, the front and rear adjacent switches are respectively marked as N-1 and N +1, the switch N-1 is located at the side of the interconnection switch M, the switch N +1 is located at the side of the interconnection switch N, and it is assumed that the side PT of the switch M is connected to the phase AB and the side PT of the switch N is connected to the phase CB.
3. The method for controlling loop closing operation of distribution line according to claim 1, wherein: in the step (2), the condition that the interconnection switch is in the position division is confirmed, and the voltages collected at the two sides of the switch are both greater than a fixed value, namely the conditions are met:
wherein, UM·AB、UN·CBRespectively the amplitude of the line voltage between the phase AB and the phase CB of the interconnection switch M side and the amplitude of the line voltage between the phase CB of the N sideTIs a definite value.
4. The method for controlling loop closing operation of distribution line according to claim 1, wherein: comparing the line voltage information of the two sides of the interconnection switch with the loop closing constant value in the step (4), and judging whether a loop closing condition is met, wherein the specific content comprises the following steps:
a) the line voltage amplitude values on the two sides of the tie switch meet a set value, namely:
Umin＜UL＜Umax
wherein U isLIndicating the respective line voltage at the tie switch, UminTo a defined value, U, under the amplitudemaxDefining a value for the amplitude;
b) the amplitude difference of the line voltages corresponding to the two sides of the switch is smaller than a set value, namely the following conditions are met:
wherein U isthSetting the amplitude difference as an amplitude difference set value to be 10V;
c) the difference between the two line voltage phases collected by the interconnection switch meets a set value, namely:
wherein,the phase angle of two line voltages is shown, and the phase difference between the line voltage between the CB phase and the line voltage between the AB phase is 60 degrees when the systems on the two sides operate completely at the same time;is a lower limit value of the phase angle difference;is an upper limit value of the phase angle difference.
5. The method for controlling loop closing operation of distribution line according to claim 4, wherein: in the step (4), when the three conditions of the loop closing condition are all satisfied, the systems on the two sides are considered to be in a synchronous state, the interconnection switch is allowed to be switched on, and the loop closing operation is executed; otherwise, the contact switch is forbidden to be switched on, and the loop closing operation is cancelled.
6. The method for controlling loop closing operation of distribution line according to claim 5, wherein: in the step (4), when the line is overhauled or the load is transferred, switching operation is required, and a method of firstly closing the interconnection switch to enable the system to be closed and then disconnecting the section switch is adopted.
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| CN105720606B (en) * | 2016-04-12 | 2018-02-16 | 贵州黔燎原电气科技有限公司 | A kind of control method of active power distribution network unperturbed cyclization for active power distribution network |
| CN106787201A (en) * | 2016-12-30 | 2017-05-31 | 国网天津市电力公司 | A kind of closed loop network method that phase is determined based on remote online |
| CN109066985A (en) * | 2018-08-28 | 2018-12-21 | 云南电网有限责任公司电力科学研究院 | A kind of quick cyclization tune electric system and method |
| CN109444790B (en) * | 2018-10-29 | 2021-05-04 | 广西电网有限责任公司电力科学研究院 | Method suitable for feeder terminal to identify working state of power supply voltage transformer |
| CN111914377B (en) * | 2020-08-14 | 2024-05-03 | 南方电网数字电网研究院股份有限公司 | Method and system for repairing feeder line loss model, computer equipment and readable storage medium |
| CN112636471B (en) * | 2020-12-11 | 2022-08-02 | 国网安徽省电力有限公司黄山供电公司 | Method for judging abnormal ring opening in 10KV distribution network ring closing process |
| CN117439033B (en) * | 2023-12-19 | 2024-05-14 | 成都天合一成科技服务有限公司 | System for preventing loop closing misoperation based on real-time data of transformer substation |
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