CN103915838B - Out-of-step splitting method based on section information for power system - Google Patents
Out-of-step splitting method based on section information for power system Download PDFInfo
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- CN103915838B CN103915838B CN201410132837.1A CN201410132837A CN103915838B CN 103915838 B CN103915838 B CN 103915838B CN 201410132837 A CN201410132837 A CN 201410132837A CN 103915838 B CN103915838 B CN 103915838B
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Abstract
The invention discloses an out-of-step splitting method based on section information for a power system. The step-out disconnection device comprises a step-out judging relay, a communication module and a logic operation module, wherein the step-out judging relay and the communication module are connected with the logic operation module, the logic operation module is connected with an outlet relay, and the step-out disconnection method comprises the following steps: 1) the out-of-step judging relay judges the out-of-step state of the line by using the voltage and current information of the line, and transmits the out-of-step state as a local criterion of out-of-step disconnection to the logic operation module; 2) the communication module receives the judgment results of the out-of-step judgment relays of other stations on the same section, transmits the judgment results to the logic operation module, and obtains a remote criterion through the logic operation module; 3) the logic operation module operates the local criterion and the remote criterion to obtain the out-of-step disconnection action criterion, and the outlet relay determines whether to disconnect the line according to the action criterion. The invention avoids the possibility that the system is unstable but the step-out can not be correctly judged under the fault condition, and prevents the occurrence of large-area power failure accidents.
Description
Technical field
The present invention relates to a kind of out-of-step solution method based on section information of electric power system, belong to the innovative technology of the out-of-step solution method based on section information of electric power system.
Background technology
In extreme catastrophe failure situation, electric power system loses synchronously, will cause large area blackout as processed not in time.Out-of-Step Splitting Systems device is as the important measures ensureing power system safety and stability, it is the last line of defense avoiding power system collapse, be that two parts or excision sending end Power Plant avoid fault spread by system splitting when specifically acting as Out-of-Step Splitting Systems device decision-making system step-out, maintain system stability.
Existing Out-of-Step Splitting Systems device all differentiates circuit desynchronizing state based on our station electric parameters.Along with power system development, contact day by day tight between large regions electrical network, contact section is made up of multi circuit transmission lines usually, and in catastrophe failure situation, oscillation center is positioned on contact section, but there is oscillating characteristic not significantly situation on some circuit.Tradition Out-of-Step Splitting Systems device only utilizes the electric parameters of this device of access to judge step-out, if oscillating characteristic is obvious not on this circuit, there is the possibility that correctly can not identify step-out in tradition Out-of-Step Splitting Systems device, cause system unstability situation line can not off-the-line, fault spread, causes large area blackout.
Summary of the invention
The present invention is based on the oscillating characteristic of all the other circuits on same contact section, propose a kind of out-of-step solution method based on section information of electric power system.The present invention utilizes distant place criterion (unstability that same section has mutually synchronous/asynchronous characteristic line road differentiates result) to differentiate this circuit desynchronizing state in conjunction with local criterion (result based on our station voltage, current information differentiate this line status), effectively can avoid system unstability but Out-of-Step Splitting Systems device can not differentiate and the situation of step-out prevents the generation of large area blackout.
To achieve these goals, the technical solution used in the present invention is as follows:
The out-of-step solution method based on section information of electric power system of the present invention, wherein the Out-of-Step Splitting Systems device based on section information of electric power system includes step-out differentiation relay, communication module and logical operation module, wherein step-out differentiates that relay and the output of communication module are connected with the input of logical operation module, the output of logical operation module is connected with exit relay, and the out-of-step solution method based on section information comprises the following steps:
(1) our station step-out differentiates that relay utilizes our station voltage, current information differentiates this circuit desynchronizing state, as the local criterion of Out-of-Step Splitting Systems, and is sent to logical operation module;
(2) communication module receives the differentiation result of the step-out differentiation relay of same all the other websites of section, and is sent to logical operation module, obtains distant place criterion after logical operation module computing;
(3) logical operation module carries out computing to local criterion and distant place criterion, obtains the operating criterion of our station Out-of-Step Splitting Systems, and exit relay determines whether separate column line according to operating criterion.
The out-of-step solution method based on section information of electric power system of the present invention utilizes distant place criterion to differentiate this circuit desynchronizing state in conjunction with local criterion.
Above-mentioned distant place criterion is the unstability differentiation result that same section has mutually synchronous/asynchronous characteristic line road.
Above-mentioned local criterion is the result differentiated this line status based on our station voltage, current information.
By step-out, the present invention differentiates that relay, communication module, logical operation module, exit relay are formed.Step-out differentiates that relay utilizes our station electric parameters to differentiate access our station circuit asynchronous oscillation; Communication module receives all the other N number of step-outs of same section and differentiates the differentiation result of relay and be sent to logical operation module; To our station step-out, logical operation module differentiates that the differentiation result of relay and all the other N number of stepout-relaies differentiate that result carries out the operating criterion that computing obtains our station Out-of-Step Splitting Systems, according to operating criterion, exit relay determines whether off-the-line accesses our station circuit.The present invention utilizes distant place criterion to differentiate this circuit desynchronizing state in conjunction with local criterion, and determining whether separate column line, is a kind of out-of-step solution method based on section information of convenient and practical electric power system.
Accompanying drawing explanation
Fig. 1 is the structure chart based on section information Out-of-Step Splitting Systems device of electric power system of the present invention;
Fig. 2 is logical operation module structure chart;
Fig. 3 is electric network composition schematic diagram;
Fig. 4 is the local criterion schematic diagram in station 4;
Fig. 5 is a distant place, station 4 criterion schematic diagram.
Embodiment
The out-of-step solution method based on section information of electric power system of the present invention, wherein the Out-of-Step Splitting Systems device based on section information of electric power system includes step-out differentiation relay, communication module and logical operation module, wherein step-out differentiates that relay and the output of communication module are connected with the input of logical operation module, the output of logical operation module is connected with exit relay, and the out-of-step solution method based on section information comprises the following steps:
(1) our station step-out differentiates that relay utilizes our station voltage, current information differentiates this circuit desynchronizing state, as the local criterion of Out-of-Step Splitting Systems, and is sent to logical operation module;
(2) step-out that communication module receives same all the other websites of section differentiates the differentiation result of relay, and is sent to logical operation module, obtain after logical operation module computing distant place criterion (
in N number of step-out differentiation result that a distant place sends over, at least N-1 is individual is determined as step-out, then distant place criterion meets, otherwise distant place criterion does not meet);
(3) logical operation module to local criterion and distant place criterion carry out computing (distant place criterion and local criterion any one be judged to step-out, then our station Out-of-Step Splitting Systems operating criterion meets), obtain the operating criterion of our station Out-of-Step Splitting Systems, exit relay determines whether separate column line according to operating criterion.
The out-of-step solution method based on section information of electric power system of the present invention utilizes distant place criterion to differentiate this circuit desynchronizing state in conjunction with local criterion.
Above-mentioned our station step-out differentiates that relay differentiates this circuit asynchronous oscillation based on our station electric parameters; All the other N number of stepout-relaies of same section are differentiated that result reaches our station by communication module; To our station our station step-out, logical operation module differentiates that the differentiation result of relay and all the other N number of our station step-outs differentiate that the differentiation result of relay carries out computing, obtain the operating criterion of our station Out-of-Step Splitting Systems; Exit relay determines whether export solution column line according to operating criterion.
The problem run in running for actual electric network is described embodiment.As shown in Figure 2, above-mentioned electric power system includes sending end electrical network and receiving end electrical network to electric network composition schematic diagram, and sending end electrical network includes station 2 and station 3, and receiving end electrical network includes station 1 and station 4, the 1 ~ Out-of-Step Splitting Systems device of 4 configurations based on section information of standing of standing.To stand, 4 Out-of-Step Splitting Systems devices are described as research object based on section information Out-of-Step Splitting Systems device.
(as DC bipolar block) sending relative receiving-end system merit angle unstability in sending end electrical network catastrophe failure situation, oscillation center is positioned on the contact section that is made up of circuit 1 ~ circuit 4.On circuit 1 ~ circuit 3, step-out feature is obvious, and 1 ~ 3 stepout-relaies of standing of standing can determine step-out; Although circuit 4 is also positioned at oscillation center section, oscillation characteristics is obvious not, and 4 stepout-relaies of standing can not determine step-out.The local step-out criterion in station 4 is not met; Because standing, 1 ~ 3 stepout-relaies of standing can determine step-out, 4 distant place step-out criterions of standing are satisfied, and (any two of 1 ~ 3 stepout-relaies of standing of standing are judged to step-out, 4 distant place criterions of then standing meet), then station 4 meets based on section information Out-of-Step Splitting Systems device action criterion, and column line 4 are separated in 4 Out-of-Step Splitting Systems devices outlets of standing.
Fig. 4 is the local criterion output signal of station 4 Out-of-Step Splitting Systems device, and because local criterion does not meet, local criterion exports and is continuously 0; Fig. 5 is an Out-of-Step Splitting Systems device distant place, station 4 criterion output signal, and 174 cycle distant place criterions meet, and therefore 174 cycle distant place criterion signals become 1 by 0.
Claims (3)
1. the out-of-step solution method based on section information of an electric power system, wherein the Out-of-Step Splitting Systems device based on section information of electric power system includes step-out differentiation relay, communication module and logical operation module, wherein step-out differentiates that relay and the output of communication module are connected with the input of logical operation module, the output of logical operation module is connected with exit relay, and the out-of-step solution method based on section information comprises the following steps:
(1) our station step-out differentiates that relay utilizes our station voltage, current information differentiates this circuit desynchronizing state, as the local criterion of Out-of-Step Splitting Systems, and is sent to logical operation module;
(2) communication module receives the differentiation result of the step-out differentiation relay of same all the other websites of section, and is sent to logical operation module, obtains distant place criterion after logical operation module computing;
(3) logical operation module carries out computing to local criterion and distant place criterion, obtains the operating criterion of our station Out-of-Step Splitting Systems, and exit relay determines whether separate column line according to operating criterion;
Above-mentioned distant place criterion is the unstability differentiation result that same section has mutually synchronous/asynchronous characteristic line road.
2. the out-of-step solution method based on section information of electric power system according to claim 1, is characterized in that utilizing distant place criterion to differentiate this circuit desynchronizing state in conjunction with local criterion.
3. the out-of-step solution method based on section information of electric power system according to claim 2, is characterized in that above-mentioned local criterion is the result differentiated this line status based on our station voltage, current information.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300534B (en) * | 2014-10-14 | 2016-10-26 | 广州供电局有限公司 | Partial electric grid Active Splitting method and system |
| CN104459460A (en) * | 2014-11-06 | 2015-03-25 | 中国南方电网有限责任公司 | Electric system out-of-step oscillation section capture method |
| CN105977929B (en) * | 2016-05-09 | 2018-07-06 | 南京南瑞继保电气有限公司 | A kind of electric system loss of synchronism protection system and guard method |
| CN106099876B (en) * | 2016-07-14 | 2018-07-20 | 南京南瑞继保电气有限公司 | A kind of out-of-step protection method based on both sides electrical quantity |
| CN108736493B (en) * | 2018-05-25 | 2020-06-09 | 南京国电南自电网自动化有限公司 | Construction method, control system and control method of power system safety island |
| CN110460042B (en) * | 2019-07-26 | 2022-11-29 | 中国南方电网有限责任公司 | Wide area information-based out-of-step separation control method and system and readable storage medium |
| CN110492613B (en) * | 2019-08-23 | 2021-03-02 | 中国能源建设集团广东省电力设计研究院有限公司 | Section out-of-step separation discrimination control system and method |
| CN112383067A (en) * | 2020-11-11 | 2021-02-19 | 中国南方电网有限责任公司 | Control method and system for dealing with power system out-of-step disconnection and storage medium |
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