CN104810832A - Comprehensive phase selection control method considering load states - Google Patents
Comprehensive phase selection control method considering load states Download PDFInfo
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- CN104810832A CN104810832A CN201510208128.1A CN201510208128A CN104810832A CN 104810832 A CN104810832 A CN 104810832A CN 201510208128 A CN201510208128 A CN 201510208128A CN 104810832 A CN104810832 A CN 104810832A
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Abstract
The invention provides a comprehensive phase selection control method considering load states. The comprehensive phase selection control method includes steps of setting a default load type, and determining short-circuit fault connection and disconnection requirements in corresponding load application positions; acquiring circuit current by a current transformer; judging whether circuit fault happens or not, if yes, entering a circuit fault current phase selection breaking stage, otherwise entering a normal load phase selection breaking stage. The comprehensive phase selection control method can meet phase selection requirements of various load states and provides more flexible strategy implementing routes. In the actual power system, a circuit breaker combined with the control method is more complete in function and practical. Furthermore, by the comprehensive phase selection control method, phase selection control is more flexible, and applicability of the phase selection control is improved.
Description
Technical field
The present invention relates to a kind of control method, be specifically related to a kind of comprehensive phase-controlled method considering load condition.
Background technology
Electrical network is the dynamical system of moment change, wherein the equilibrium of supply and demand, voltage transformation, quality adjustment etc. for system stable, reliable, safe operation is most important.The conventional equipments such as compensation condenser group, no-load transformer, Reactor banks are applied more in power system operation process, and switching manipulation is frequent, but misoperation may produce various disturbance to electrical power trans mission/distribution system, along with shoving and overvoltage phenomenon, this impact even may propagate into far-end load, causes a series of chain reaction.
The faults such as meanwhile, in practical power systems, primary equipment can be short-circuited due to the reason such as external force, ageing of insulation in running, broken string, wherein, line short is the most common, that impact is also maximum failure mode.Along with electric power system is to high pressure, Large Copacity future development, short circuit current level continues to improve, and the maximum operation-current level of current existing circuit breaker is more and more difficult to meet system needs.
In order to transition effects such as the overvoltage during conventional equipment such as suppression capacitor, reactor switching, researcher often adopts in circuit breaker two ends parallel resistance, installs R-C resistance-capacitance absorption device, or installs the methods such as metal zinc oxide lightning arrester.But these measures can only absorb the energy gushed out after transient oscillation occurs, belong to a kind of " afterwards " processing policy, can not fundamentally prevent, solve transient state and impact and shoving and overvoltage problem of causing thus.Meanwhile, effectively cut-off to realize the rear circuit breaker of short trouble generation, researcher also often adopts change power network topology, installs short circuit current limiter additional, increases the methods such as energy-absorbing loop, and the short circuit current that fundamentally can not improve circuit breaker equally cut-offs level.
Phase-controlled technology is a kind of new technology by selecting Circuit Breaker Switching load phase place to realize electric power system smooth transition.This technology can according to load type (conventional equipment be as capacitor, reactor, no-load transformer etc.), transition effects such as at the switching phase control breaker actuation of its best, effectively can reducing in theory, even eliminate overvoltage, shove.Short-circuit current then only needs phase selection disjunction, can effectively reduce the contact arcing time, extension device service life, strengthens the operational reliability etc. of system.Current line switching cut-off the background that capacity can not meet power network development under, phase selection disjunction also can improve the short circuit interruption level of power switch effectively.But for different load characters, the optimum phase of its phase selection operation is not identical yet, and concrete implementation strategy is also subject to the impact of load connected mode.In addition, short-circuit current aperiodicity changes, and breaking course is also different from capacitor, reactor etc., needs to dope short circuit current waveform before relay protection system is given an order, and in conjunction with the machinery of switch and electrical characteristic, determines available target phase zero point.Researcher proposes the prediction algorithm of multiple short-circuit failure current zero both at home and abroad at present, the people such as POLTL propose one " point of safes method " (POLTL A, FROHLICH K.A newalgorithm enabling controlled short circuit interruption [J] .IEEE Trans.On Power Delivery, 2003,18 (3): 802-808.).Richard Thomas etc. proposes adaptive approach (THOMAS R, DAALDER J, SOLVERC E.An adaptive self-checking algorithm for controlled fault interruption [C] .18th InternationalConference on Electricity Distribution, Turin, Italy, 2005.), the people such as Luo Chujun proposes the Half-cycle Fourier Algorithmfor of improvement.Three kinds of algorithm characteristic differences, in actual applications, the choose reasonable of strategy needs according to its feature reasonable coordination.In addition, also cut-off requirement etc. with abort situation point, failure mode, system relevant for the phase selection strategy of short-circuit current.
To sum up, current phase-controlled device spininess to the load condition of single type, and does not consider the phase selection implementation strategy under short trouble.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of comprehensive phase-controlled method considering load condition, make corresponding phase-controlled more flexible, the applicability of phase-controlled is also enhanced.
In order to realize foregoing invention object, the present invention takes following technical scheme:
The invention provides a kind of comprehensive phase-controlled method considering load condition, said method comprising the steps of:
Step 1: default load type is set, and determine that the short trouble under respective load application site cut-offs requirement;
Step 2: current transformer gathers line current;
Step 3: judge whether line fault occurs, if enter the line fault electric current phase selection disjunction stage, otherwise enter the normal load phase selection disjunction stage.
In described step 1, the default load type that user side is arranged comprises capacitor, reactor and no-load transformer; Applied environment determination line fault according to circuit breaker scene cut-offs requirement.
In described step 2, the current transformer installed on the line gathers line current, and sends the line current of collection to phase-controlled device.
In described step 3, phase-controlled device based on the line current received, and carries out the judgement of line fault according to current break quantity algorithm.
In the line fault electric current phase selection disjunction stage, first judge line fault type, the zero crossing phase place of recycling line fault zero crossing forecast algorithm determination faulted phase current.
If non-three-phase fault, circuit breaker cut-offs successively according to the zero crossing phase sequence of faulted phase current.
If three-phase fault, line fault electric current first reaches one of zero crossing and cut-offs in zero crossing phase place, second-phase gives up the zero crossing phase place of initial prediction, zero crossing phase place is redefined according to line fault electric current during two-phase phase fault, circuit breaker is carved at this moment and is cut-off, judge whether the phase finally reaching zero crossing phase place still exists line fault electric current, if cut-off in the zero crossing phase place of initial prediction; Then terminate if not.
Described line fault type comprises non-three-phase fault and three-phase fault; Described non-three-phase fault comprises single phase ground fault, two-phase phase fault and double earthfault.
In the normal load phase selection disjunction stage, first judge whether the separating brake or the closing operation order that there is the transmission of user side, if without, return step 2; If otherwise there is separating brake order, the line current zero crossing disjunction that circuit breaker is gathering, and complete phase selection operation, if there is order of closing a floodgate, then call corresponding strategy according to the acquiescence load type arranged, namely capacitor closed a floodgate in the moment at zero point of its terminal voltage, and no-load transformer, reactor close a floodgate in its terminal voltage peak value moment, completed phase selection operation.
Described line fault zero crossing forecast algorithm adopts point of safes algorithm, adaptive algorithm or Half-cycle Fourier Algorithmfor.
Described point of safes algorithm is used for occasion rapidity being had to requirement; It is little and rapidity, stability, precision are all had to the occasion of requirement that described adaptive algorithm is used for harmonic wave; It is little and precision and rapidity are had to the occasion of requirement that described Half-cycle Fourier Algorithmfor is used for signal noise.
Compared with prior art, beneficial effect of the present invention is:
The comprehensive phase-controlled method of consideration load condition provided by the invention, can meet the phase selection requirement under multiple load condition, provides tactful realizing route more flexibly; In practical power systems, the circuit breaker function be combined with this control method is more perfect, also more practical; And the invention enables corresponding phase-controlled more flexible, the applicability of phase-controlled is also enhanced.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of phase-controlled switch in the embodiment of the present invention;
Fig. 2 is the comprehensive phase-controlled method flow diagram considering load condition in the embodiment of the present invention;
Fig. 3 is simple power system equivalent schematic diagram in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As Fig. 2, the invention provides a kind of comprehensive phase-controlled method considering load condition, said method comprising the steps of:
Step 1: default load type is set, and determine that the short trouble under respective load application site cut-offs requirement;
Step 2: current transformer gathers line current;
Step 3: judge whether line fault occurs, if enter the line fault electric current phase selection disjunction stage, otherwise enter the normal load phase selection disjunction stage.
In described step 1, the default load type that user side is arranged comprises capacitor, reactor and no-load transformer; Applied environment determination line fault according to circuit breaker scene cut-offs requirement.
In described step 2, the current transformer installed on the line gathers line current, and sends the line current of collection to phase-controlled device.
In described step 3, phase-controlled device based on the line current received, and carries out the judgement of line fault according to current break quantity algorithm.
In the line fault electric current phase selection disjunction stage, first judge line fault type, the zero crossing phase place of recycling line fault zero crossing forecast algorithm determination faulted phase current.
If non-three-phase fault, circuit breaker cut-offs successively according to the zero crossing phase sequence of faulted phase current.
If three-phase fault, line fault electric current first reaches one of zero crossing and cut-offs in zero crossing phase place, second-phase gives up the zero crossing phase place of initial prediction, zero crossing phase place is redefined according to line fault electric current during two-phase phase fault, circuit breaker is carved at this moment and is cut-off, judge whether the phase finally reaching zero crossing phase place still exists line fault electric current, if cut-off in the zero crossing phase place of initial prediction; Then terminate if not.
Described line fault type comprises non-three-phase fault and three-phase fault; Described non-three-phase fault comprises single phase ground fault, two-phase phase fault and double earthfault.
In the normal load phase selection disjunction stage, first judge whether the separating brake or the closing operation order that there is the transmission of user side, if without, return step 2; If otherwise there is separating brake order, the line current zero crossing disjunction that circuit breaker is gathering, and complete phase selection operation, if there is order of closing a floodgate, then call corresponding strategy according to the acquiescence load type arranged, namely capacitor closed a floodgate in the moment at zero point of its terminal voltage, and no-load transformer, reactor close a floodgate in its terminal voltage peak value moment, completed phase selection operation.
Described line fault zero crossing forecast algorithm adopts point of safes algorithm, adaptive algorithm or Half-cycle Fourier Algorithmfor.
Described point of safes algorithm is used for occasion rapidity being had to requirement; It is little and rapidity, stability, precision are all had to the occasion of requirement that described adaptive algorithm is used for harmonic wave; It is little and precision and rapidity are had to the occasion of requirement that described Half-cycle Fourier Algorithmfor is used for signal noise.
As shown in Figure 3 in simple power system equivalent schematic diagram, the circuit breaker applying comprehensive phase-controlled strategy process is in diverse location, in figure, CBZ and CBL all represents circuit breaker, LZ represents line load, also all can meet the requirement of system divide-shut brake, reduce the adverse effect that arcing process causes contact and system.CZ may be then capacitor, no-load transformer or shunt reactor.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; those of ordinary skill in the field still can modify to the specific embodiment of the present invention with reference to above-described embodiment or equivalent replacement; these do not depart from any amendment of spirit and scope of the invention or equivalent replacement, are all applying within the claims of the present invention awaited the reply.
Claims (11)
1. consider a comprehensive phase-controlled method for load condition, it is characterized in that: said method comprising the steps of:
Step 1: default load type is set, and determine that the short trouble under respective load application site cut-offs requirement;
Step 2: current transformer gathers line current;
Step 3: judge whether line fault occurs, if enter the line fault electric current phase selection disjunction stage, otherwise enter the normal load phase selection disjunction stage.
2. the comprehensive phase-controlled method of consideration load condition according to claim 1, is characterized in that: in described step 1, and the default load type that user side is arranged comprises capacitor, reactor and no-load transformer; Applied environment determination line fault according to circuit breaker scene cut-offs requirement.
3. the comprehensive phase-controlled method of consideration load condition according to claim 1, is characterized in that: in described step 2, and the current transformer installed on the line gathers line current, and sends the line current of collection to phase-controlled device.
4. the comprehensive phase-controlled method of consideration load condition according to claim 1, is characterized in that: in described step 3, and phase-controlled device based on the line current received, and carries out the judgement of line fault according to current break quantity algorithm.
5. the comprehensive phase-controlled method of consideration load condition according to claim 1, it is characterized in that: in the line fault electric current phase selection disjunction stage, first judge line fault type, the zero crossing phase place of recycling line fault zero crossing forecast algorithm determination faulted phase current.
6. the comprehensive phase-controlled method of consideration load condition according to claim 5, it is characterized in that: if non-three-phase fault, circuit breaker cut-offs successively according to the zero crossing phase sequence of faulted phase current.
7. the comprehensive phase-controlled method of consideration load condition according to claim 5, it is characterized in that: if three-phase fault, line fault electric current first reaches one of zero crossing and cut-offs in zero crossing phase place, second-phase gives up the zero crossing phase place of initial prediction, zero crossing phase place is redefined according to line fault electric current during two-phase phase fault, circuit breaker is carved at this moment and is cut-off, judge whether the phase finally reaching zero crossing phase place still exists line fault electric current, if cut-off in the zero crossing phase place of initial prediction; Then terminate if not.
8. the comprehensive phase-controlled method of consideration load condition according to claim 5, is characterized in that: described line fault type comprises non-three-phase fault and three-phase fault; Described non-three-phase fault comprises single phase ground fault, two-phase phase fault and double earthfault.
9. the comprehensive phase-controlled method of consideration load condition according to claim 1, is characterized in that: in the normal load phase selection disjunction stage, first judged whether the separating brake or the closing operation order that there is the transmission of user side, if without, return step 2; If otherwise there is separating brake order, the line current zero crossing disjunction that circuit breaker is gathering, and complete phase selection operation, if there is order of closing a floodgate, then call corresponding strategy according to the acquiescence load type arranged, namely capacitor closed a floodgate in the moment at zero point of its terminal voltage, and no-load transformer, reactor close a floodgate in its terminal voltage peak value moment, completed phase selection operation.
10. the comprehensive phase-controlled method of consideration load condition according to claim 1, is characterized in that: described line fault zero crossing forecast algorithm adopts point of safes algorithm, adaptive algorithm or Half-cycle Fourier Algorithmfor.
The comprehensive phase-controlled method of 11. consideration load conditions according to claim 10, is characterized in that: described point of safes algorithm is used for occasion rapidity being had to requirement; It is little and rapidity, stability, precision are all had to the occasion of requirement that described adaptive algorithm is used for harmonic wave; It is little and precision and rapidity are had to the occasion of requirement that described Half-cycle Fourier Algorithmfor is used for signal noise.
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| CN109085457A (en) * | 2018-06-21 | 2018-12-25 | 国网宁夏电力有限公司电力科学研究院 | A kind of method of high-voltage line fault zero crossing quick predict |
| CN111371077A (en) * | 2020-01-14 | 2020-07-03 | 山东大学 | Protection control method suitable for elastic intelligent power distribution network with multiple fault types |
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| CN109085457A (en) * | 2018-06-21 | 2018-12-25 | 国网宁夏电力有限公司电力科学研究院 | A kind of method of high-voltage line fault zero crossing quick predict |
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| CN111371077B (en) * | 2020-01-14 | 2021-01-08 | 山东大学 | Protection control method suitable for elastic intelligent power distribution network with multiple fault types |
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