CN104217634B - Distribution true-value simulation test method - Google Patents
Distribution true-value simulation test method Download PDFInfo
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Abstract
The present invention is distribution true value simulation test method and apparatus, is made up of pressure regulator, booster transformer, switch, current-limiting reactor, direct-to-ground capacitance device, computer measurement and control analytic unit, distribution net work earthing fault unit dG, power distribution network phase-to phase fault unit xG and distribution products test unit SP etc..By the rated voltage of pressure regulator and transformer boost to power distribution network, by changing the method for operation and the parameter of simulation power distribution network, encouraged and be allowed to produce overvoltage, for mechanism of production and the safeguard procedures of experimental study power distribution network internal overvoltage.Earth fault unit dG and phase-to phase fault unit xG, the failure mechanism of experimental study power distribution network, failure process, fault recovery and troubleshooting measure is put into by switch.By putting into distribution products test unit SP, through dynamic test and the Test to Failure of distribution true-value simulation try net, analyze the relevant functional parameter of distribution products and the correctness of technical parameter through computer observing and controlling analytic unit.
Description
Technical field
The present invention is that field tested by power distribution network, is mainly used in power distribution network stable state and relay protection, overvoltage mechanism test, distribution network failure test and the exploitation of distribution products, checking and Demonstrator Trials.
Background technology
Power distribution network is system with non effectively earth ed neutral, and its internal overvoltage odds and level are higher, need to study the genesis mechanism of internal overvoltage and safeguard procedures；Because power distribution network network is big, dielectric level is low easily to be affected by lightning surge, needs to study lightning surge to the mechanism of action of power distribution network；Power distribution network is that the electrical network directly facing user has the highest requirement to power supply reliability, needs to use substantial amounts of controller switching equipment, the suitability of power distribution network need to be studied and be tested by controller switching equipment.Power distribution network is carried out the main method that various test is research, directly on power distribution network, carry out various test, effect is the most directly with real, but this can bring greater impact to the safe and stable operation of power distribution network, this be power system and vast power consumer the most unacceptable, some test even cannot be carried out.Thus must build one with power distribution network mutually one to distribution simulation test net, require this distribution simulation test net and real power distribution network one to, the result of the test carried out at this electrical analogue net can be fully equivalent in the result of the test at true power distribution network, thus referred to as true-value simulation power distribution network.The network structure of this true-value simulation power distribution network and voltage request and real power distribution network complete to, simply simulate, with lumped parameter, the power distribution network examination platform that the distributed constant of power distribution network builds.The different network structure of power distribution network and the method for operation can be simulated by this platform, the various operating modes such as the properly functioning of power distribution network and failure operation can be simulated.Can be the most suitable with each parameter of simulation test distribution products, the requirement run at power distribution network to examine product whether to meet.By this platform, the running status of power distribution network itself can conduct a research to disclose the relevant moving law of power distribution network.
Summary of the invention
For the problems referred to above, invent the distribution true-value simulation try net of the distributed constant being replaced power distribution network by lumped parameter, the equivalence of this distribution true-value simulation try net and real power distribution network height, in terms of electric network composition, electric pressure and the method for operation and operating condition with actual power distribution network one to.This distribution true-value simulation try net is made up of pressure regulator, booster transformer, switch, disconnecting link, current transformer, voltage transformer, spark gap, power cable, overhead transmission line, current-limiting reactor and capacitor over the ground, computer measurement and control analytic unit, distribution net work earthing fault unit dG, phase-to phase fault unit xG and product testing cell S P.The voltage of distribution true-value simulation try net can be raised to the rated voltage of corresponding voltage grade power distribution network by pressure regulator and booster transformer.Distribution substation is constituted by equipment such as pressure regulator, booster transformer, switch, disconnecting link, electric current, voltage transformer, spark gap and grounding device；Distribution line is constituted by power cable, overhead transmission line, on-pole switch and direct-to-ground capacitance device, current-limiting reactor and distribution transformer.The distribution capacity over the ground of direct-to-ground capacitance device simulation power distribution network, series inductance mimic bus distributed inductance, structure and the scale of different distribution line can be simulated.Distribution transformer, on-pole switch, capacitor etc. are used for simulating Distribution Network Equipment.With impulse voltage generator, simulation power distribution network is applied lightning impulse voltage.
Present invention lumped parameter replace distribution true-value simulation try net and the real power distribution network one of the composition of the distributed constant of power distribution network to, the result of the test carried out at this distribution true-value simulation try net can be fully equivalent in the result of the test at true power distribution network.This distribution true-value simulation try net is the power distribution network examination platform of the distributed constant replacing power distribution network built with lumped parameter, can simulate the different network structure of power distribution network and the method for operation by this platform；Open-phase operation can be carried out, operate with failure, parameter coordination can be used and apply the method for disturbance and be allowed to produce various internal overvoltage.By computer measurement and control analytic unit, the mechanism of production of the various internal overvoltages of research power distribution network and the precautionary measures.The properly functioning of power distribution network and accident operating condition can be simulated.The each parameter that can simulate distribution products arranges requirement that is the most suitable, that run at power distribution network to examine product whether to meet.By this platform, the running status of power distribution network itself can conduct a research to disclose the relevant moving law of power distribution network.The product of power distribution network can be developed research by this platform, the suitability to distribution products is studied.
The present invention has an advantage that
1, distribution true-value simulation try net be the distributed constant being replaced power distribution network by lumped parameter the true-value simulation constituted test power distribution network and real power distribution network one to, the result of the test carried out at this distribution simulation net can be fully equivalent in the result of the test at true power distribution network.
2, can carry out various power distribution network misoperation test at this distribution true-value simulation try net, can manufacture various malfunction, these cannot be carried out on actual power distribution network.
3, carry out various power distribution network test, convenient, safety at distribution true-value simulation try net, easily realize, it is simple to operation, electrical network is not impacted, solve many difficult problems that cannot be carried out test on real power distribution network.
Accompanying drawing explanation
Fig. 1 is distribution true-value simulation try net wiring diagram, in figure: T is three-phase regulator；B is booster transformer；YH is voltage transformer；QF1-QF6For chopper；C10-C20For capacitor；L1-L2For reactor；M is computer measurement and control analytic unit；DG is distribution net work earthing fault unit；XG is phase-to phase fault unit；SP is product testing unit.
Detailed description of the invention
1, the simulation operation of power distribution network of distribution true-value simulation try net and overvoltage mechanism of production and restriction are used
This distribution true-value simulation try net can simulate the Parameters variation of the change correspondence of the method for operation of power distribution network, can simulate the real power distribution network various operating conditions in steady operational status.By putting into and excise the change that relevant device can simulate the relevant electrical network parameter changing its correspondence of the power distribution network method of operation.Put into by switching manipulation and can simulate power distribution network in grid switching operation process, the Parameters variation of measurement related elements, the switching overvoltage produced during research distribution grid switching operation with disconnection related elements；It is made to produce ferromagnetic resonance by the method changing true-value simulation power distribution network capacitance to earth and being allowed to meet the condition of ferromagnetic resonance and applying excites, through the mechanism that computer observing and controlling analytic unit analytic demonstration power distribution network ferromagnetic resonance produces, resonant frequency range and the relation of condition of resonance, verify the harmonic elimination effect of various suppression measures.The power-frequency voltage being studied power distribution network by the series inductance and direct-to-ground capacitance adjusting true-value simulation power distribution network is raised.Make it produce resonance by adjustment arc suppression coil induction reactance and network capacitance to earth and study arc suppression coil of power distribution network resonance mechanism and the precautionary measures.Put into distribution line by non-three phase and controller switching equipment comes simulation study power distribution network wire-break resonance mechanism and the precautionary measures.With impulse voltage generator, true-value simulation power distribution network is applied lightning impulse voltage and study the lightning voltage mechanism of action to power distribution network, the safeguard procedures of research power distribution network lightning surge.
2, all kinds of faults and the failure mechanism of distribution true-value simulation try net simulation power distribution network are used
Distribution true-value simulation try net can simulate the failure operation state of power distribution network, puts into Single-phase Ground Connection Failure dG, research power distribution network single-phase instantaneity earth fault and single-phase permanent earth fault process by switching manipulation.Come simulation test power distribution network Single Phase Metal ground short circuit fault, single-phase transition resistance ground short circuit fault by the resistance size changing earth fault, measure and analyze trouble point earth resistance to earth current and the impact of neutral point displacement voltage.The operating mode impact on blow-out marginal value in surface during by changing earth fault point insulating insulation working condition tests insulator arc-over, the insulation recovery speed of research trouble point and the relation of insulator surface state, study the relation of blow-out marginal value and trouble point dielectric level.Phase fault XG is put into, through computer observing and controlling analytic unit analytic demonstration research power distribution network two-phase ground short circuit fault and the recovery time of fault thereof, research two-phase short trouble and the Restoration mechanism of fault thereof by switching manipulation；Research three-phase ground short trouble and the recovery time of fault thereof, research three phase short circuit fault and the Restoration mechanism of fault thereof.By the change of sensor detection power distribution network electrical network relevant parameter under these malfunctions and the impact on power distribution network thereof, through time-continuing process and the blow-out mechanism of computer observing and controlling analytic unit analytic demonstration power distribution network ground arc.Research distribution network failure point failure passage and the relation of blow-out marginal value, the surface operating mode of research earth fault insulator and the relation of fault point voltage resume speed, study the relation of blow-out time corresponding to the different dielectric level of earth fault and blow-out marginal value；The impact on blow-out marginal value of the research trouble point earth resistance.
3, use distribution true-value simulation try net simulation power distribution network as the development platform of distribution products
Being verified the development idea of distribution products by the simulation test of distribution true-value simulation try net, the development idea being put into SP unit checks distribution products by switching manipulation is the most correct.After distribution test product is put into distribution true-value simulation try net, distribution true-value simulation try net is carried out dynamic test and Test to Failure, various functions index and technical parameter to test specimen are tested, the most correct, rationally through the developing thought of computer observing and controlling analytic unit analytic demonstration distribution test product, whether function reaches, technology path and method are the most feasible, there is also which problem, and how to be modified.Carry out test at distribution true-value simulation try net and the functional parameter of power network neutral point grounding apparatus, protection equipment, switchgear and power distribution automation equipment can be carried out experimental verification.Being tested and Test to Failure by the enterprising Mobile state of true-value simulation power distribution network, the function of inspection product is the most correct, and whether whether index can reach, be in operation and there is a problem, if can meet the service requirement at power distribution network.Product whether existing defects on functional design and structure can be found out by test.Can being in operation our product by test, some occurred are abnormal carries out analysis of experiments, thus finds out problem and the solution of existence.By this test platform, the development idea of product distribution products is modified by we.
4, use distribution true-value simulation try net as the allomeric function test of complete set of distribution
By this test platform, we can also be that the allomeric function doing complete set of distribution is tested, such as: the capacitance current measurement test of dynamic earth fault complexes, automatic tracking test, troubleshooting test and switching at runtime test；The line fault intelligent diagnostics test of power distribution network intelligent diagnostics device.The ferromagnetic resonance dynamic early-warning of distribution net work earthing fault intellectual analysis processing means and harmonic elimination test；Adaptive earthing route selection is tested；The quick diagnosis of earth fault is tested with processing.Owing to above-mentioned test needs to change the method for operation of power distribution network and in the various fault of distribution network based manufacturing, the safe operation of electrical network can be produced impact, it is cannot to do on actual power distribution network, use computer simulation the most untrue, then fully equivalent with reality at true-value simulation power distribution network simulation power distribution network, and convenient to operate, there is not safety problem.By the performance of this test platform publicity product, make user increase the understanding to product and promote production marketing.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-described embodiment, and all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that, for those skilled in the art, some improvements and modifications without departing from the principles of the present invention also should be regarded as protection scope of the present invention.
Claims (4)
1. power distribution network true-value simulation test method, distribution true-value simulation try net is by pressure regulator, booster transformer, switch, current transformer, voltage transformer, bus, distribution line, current-limiting reactor, direct-to-ground capacitance device, computer measurement and control analytic unit, one-phase earthing failure in electric distribution network unit dG, power distribution network phase-to phase fault unit XG and distribution products test unit SP is constituted, it is characterized in that: this distribution true-value simulation try net is after pressure regulator and booster transformer boost to rated voltage, by changing the method for operation and the electrical network relevant parameter of simulation power distribution network, encouraged and be allowed to produce overvoltage, mechanism of production and safeguard procedures for experimental study power distribution network internal overvoltage；By putting into one-phase earthing failure in electric distribution network unit dG or failure mechanism, failure process, fault recovery and the troubleshooting measure of phase-to phase fault unit XG experimental study power distribution network；By putting into distribution products test unit SP, through dynamic test and the Test to Failure of distribution true-value simulation try net, analyze the relevant functional parameter of distribution products and the correctness of technical parameter through computer observing and controlling analytic unit.
Power distribution network true-value simulation test method the most according to claim 1, it is characterized in that: the distribution line of distribution true-value simulation try net is with current-limiting reactor, direct-to-ground capacitance device replaces power distribution network distributed constant to constitute, by changing simulation distribution net work structure, the method of operation and simulating grid parameter configuration, it is allowed to meet the occurrence condition of power distribution network internal overvoltage, it is applied excitation, it is allowed to produce switching overvoltage, resonance overvoltage, and analyze power distribution network switching overvoltage through computer observing and controlling analytic unit, the Production conditions of resonance overvoltage, mechanism of production, the tolerance of controller switching equipment and the means of defence of overvoltage and smelting manage measure.
Power distribution network true-value simulation test method the most according to claim 1, it is characterized in that: put into one-phase earthing failure in electric distribution network unit dG, research power distribution network single-phase instantaneity earth fault and single-phase permanent earth fault process at distribution true-value simulation try net by switch；Phase fault XG, research power distribution network phase-to phase fault and the recovery time of fault thereof, and the Restoration mechanism of fault is put into by switch.
Power distribution network true-value simulation test method the most according to claim 1, it is characterized in that: put into distribution products test unit SP at distribution true-value simulation try net by switch, after distribution products is accessed true-value simulation power distribution network, simulation power distribution network is carried out dynamically and Test to Failure, various functions index and technical parameter to distribution products are tested, the most correct through computer observing and controlling analytic unit analysis verification distribution products developing thought, functional parameter, whether technical parameter reaches, and the problem existed, whether examination test product can meet the service requirement of power distribution network, distribution true-value simulation try net can be tested as the allomeric function of complete set of distribution simultaneously.
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