CN110048392B - Simulation system and method for movable mould mixed grounding mode of configuration type power distribution network - Google Patents
Simulation system and method for movable mould mixed grounding mode of configuration type power distribution network Download PDFInfo
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- CN110048392B CN110048392B CN201910188019.6A CN201910188019A CN110048392B CN 110048392 B CN110048392 B CN 110048392B CN 201910188019 A CN201910188019 A CN 201910188019A CN 110048392 B CN110048392 B CN 110048392B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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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
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The invention discloses a simulation system and a simulation method for a movable mould mixed grounding mode of a configuration type power distribution network. The simulation system comprises a first grounding transformer, a second grounding transformer, a first small-resistance equivalent module and a second small-resistance equivalent module with stepless adjustable resistances, a first equivalent arc suppression coil module and a second equivalent arc suppression coil module with stepless adjustable arc suppression coil compensation degrees, a plurality of alternating current contactors and a plurality of current transformers. The invention is used for solving the problems that the neutral point grounding mode of the current power distribution network movable mould system is single, the experimental scene of the hybrid grounding mode cannot be flexibly constructed, the parameters of the arc suppression coil cannot be well matched when the capacitance and the current of the system are changed, and the like, the dynamic simulation of the hybrid grounding mode of the power distribution network can be realized through the operation of a local liquid crystal panel or the remote operation of an upper computer without changing wiring in the experiment; and the compensation degree of the arc suppression coil and the grounding resistance of the small-resistance grounding system can be stepless adjustable within a certain range.
Description
Technical Field
The invention relates to the field of dynamic simulation of distribution networks, in particular to a simulation system and a simulation method for a mixed grounding mode of a movable mould of a configuration type distribution network.
Background
With the continuous expansion of the power distribution network scale and the continuous improvement of the cabling rate in China, the capacitance current of the power distribution network system is continuously increased, and the problems of insufficient compensation capacity and untimely compensation of the grounding system of the arc suppression coil by applying more neutral points at present are faced. In order to solve the problems, many markets start to reform and upgrade the grounding mode of the power distribution network, the arc extinguishing coils are expanded and upgraded or directly reformed into a small-resistance grounding mode, the reform and upgrade are gradually carried out according to the field conditions, and the small-resistance grounding system requires that the neutral point does not lose the small resistance at any time, so that two neutral point small resistances or different principles exist when the system mode is adjusted, arc extinguishing coils of different manufacturers are operated in parallel, and even the arc extinguishing coils and the small-resistance closing rings are operated in parallel, thereby possibly bringing risks to the safe operation of the power grid.
In order to analyze the operation risk in advance, a simulation platform is needed to study the transient steady-state operation characteristics of the power distribution network in a hybrid grounding mode or the operation characteristics after the single-phase grounding fault occurs in the system. The power distribution network dynamic simulation real platform is an effective technical means, but the simulation and research of the power distribution network dynamic simulation real platform on the power distribution network mixed grounding mode at present often have the following defects:
(1) The arc suppression coil of the existing power distribution network dynamic simulation real platform is usually aimed at the adjustment of fixed capacitance and capacitance current, when the network topology is changed, the dynamic compensation cannot be realized after the system capacitance current is changed, and the system cannot be automatically switched to a full compensation state after single-phase grounding fault occurs;
(2) The existing dynamic simulation real platform of the power distribution network cannot flexibly construct the scene of the hybrid grounding mode of the power distribution network, and more small-current grounding system modeling of a single grounding mode is realized.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a simulation system of a configuration type power distribution network movable mould mixed grounding mode, which is used for solving the problems that the neutral point grounding mode of the conventional power distribution network movable mould system is single, the experimental scene of the mixed grounding mode cannot be flexibly constructed, the parameters of an arc suppression coil cannot be well matched when the capacitance and the current of the system are changed, and the like, and the dynamic simulation of the power distribution network mixed grounding mode can be realized through the operation of a local liquid crystal panel or the remote operation of an upper computer without changing wiring in the experiment.
Therefore, the invention adopts the following technical scheme: the simulation system comprises a first grounding transformer, a second grounding transformer, a first small-resistance equivalent module and a second small-resistance equivalent module with stepless adjustable resistance, a first equivalent arc suppression coil module and a second equivalent arc suppression coil module with stepless adjustable arc suppression coil compensation degree, a plurality of alternating current contactors and a plurality of current transformers;
the first small-resistance equivalent module and the first equivalent arc suppression coil module are combinedOne end of the combined transformer is connected with a first current transformer CT 1 Connected with the other end grounded, the first current transformer CT 1 The other end of the first grounding transformer is connected with the alternating current contactor S 1 Connection of the AC contactor S 1 And the other end of the third current transformer CT 3 The first grounding unit is formed by connection;
one end of the second small-resistance equivalent module and the second equivalent arc suppression coil module which are connected in parallel is connected with a second current transformer CT 2 Connected with the other end grounded, the second current transformer CT 2 The other end of the second grounding transformer is connected with the AC contactor S 5 Connection of the AC contactor S 5 And the other end of the current transformer CT 4 And the second grounding unit is formed by connection.
The invention comprehensively considers the simulation of a power distribution network mixed grounding mode, the automatic compensation of an arc suppression coil, the compensation degree of the arc suppression coil and the grounding resistance of a small-resistance grounding system to be stepless and adjustable in a certain range, and provides a simulation system for the movable mould mixed grounding of a configuration power distribution network. The grounding scene of the power distribution network hybrid grounding can be quickly constructed without changing wiring in the experiment, the arc suppression coil can compensate according to the system capacitance current and the set compensation degree, and meanwhile, the compensation degree of the arc suppression coil and the grounding resistance of the small-resistance grounding system can be stepless and adjustable in a certain range.
Further, the first small-resistance equivalent module comprises 5 resistors R 11 、R 12 、R 13 、R 14 、R 15 And 5 AC contactors S 31 、S 32 、S 33 、S 34 、S 35 Five resistors are connected in series, and two ends of each resistor are connected with an alternating current contactor in parallel;
the second small-resistance equivalent module comprises 5 resistors R 31 、R 32 、R 33 、R 34 、R 35 And 5 AC contactors S 71 、S 72 、S 73 、S 74 、S 75 Five resistors are connected in series, eachTwo ends of each resistor are connected with an alternating current contactor in parallel;
the first equivalent arc suppression coil module comprises 8 reactors X 11 、X 12 、X 13 、X 14 、X 15 、X 16 、X 17 、X 18 And 8 AC contactors S 21 、S 22 、S 23 、S 24 、S 25 、S 26 、S 27 、S 28 One reactor is connected in series with an alternating current contactor, and then all the reactors are connected in parallel and then connected with a damping resistor R 2 Series connection of damping resistors R 2 Is connected with an alternating current contactor S in parallel at two ends 4 ；
The second equivalent arc suppression coil module comprises 8 reactors X 21 、X 22 、X 23 、X 24 、X 25 、X 26 、X 27 、X 28 And 8 AC contactors S 61 、S 62 、S 63 、S 64 、S 65 、S 66 、S 67 、S 68 One reactor is connected in series with an alternating current contactor, and then all the reactors are connected in parallel and then connected with a damping resistor R 4 Series connection of damping resistors R 4 Is connected with an alternating current contactor S in parallel at two ends 8 。
Further, the simulation system also comprises a multimode grounding controller, wherein the multimode grounding controller comprises an ARM microprocessor, a communication module, a time setting module, a human-computer interface module, an intelligent wind speed adjusting control module, an interlocking opening module, an independent opening module, an arc suppression coil automatic compensation control module, a damping resistor intelligent switching control module and a local/remote control module.
Further, the interlocking opening module is used for completing the selection of the neutral point grounding mode type and is realized by controlling an alternating current contactor.
Further, the interlocking switching-out module comprises a 3-8 decoder, a driving circuit and a relay, 8 groups of interlocking signals are output through 3 GPIO ports of an ARM microprocessor, and the driving circuit is used for increasing the driving voltage to 12V and then is connected to a 12V relay to realize 8 groups of switching-out signalsThe switching-on signal is a pair of passive dry nodes, and is connected with a 220V power supply in series and then connected to a coil of an alternating current contactor to realize the control of the alternating current contactor; AC contactor S for interlocking two groups of opening modules with first grounding unit 1 、S 2 、S 3 Ac contactor S with second grounding unit 5 、S 6 、S 7 Realizing two groups of alternating current contactors S after connection 1 、S 2 、S 3 And S is equal to 5 、S 6 、S 7 And the interlocking control is performed, so that different neutral point grounding modes are flexibly constructed.
Further, the independent opening module is used for realizing the shift switching and switching control of the grounding resistor in the small-resistance equivalent module and the reactor in the equivalent arc suppression coil module.
Further, the automatic compensation control module of the arc suppression coil is used for realizing automatic compensation of the arc suppression coil, and the ARM microprocessor automatically calculates inductance current to be compensated according to the collected zero sequence current and the set compensation degree of the arc suppression coil and sends a control instruction to the independent opening module.
Further, the automatic compensation control module of the arc suppression coil performs the following steps:
step S1: setting the compensation degree p of the arc suppression coil through a local human-computer interface or an upper computer;
step S2: collecting zero sequence current, when the offset voltage of the collected neutral point is larger than a set threshold value, according to I L ＝(1+p)×I C Inductance current I required to be compensated for calculating equivalent arc suppression coil L The zero sequence current at the single-phase earth fault is the capacitance current I c ；
Step S3: inductor current I compensated according to need L Calculating equivalent reactance with zero sequence voltage;
step S4: the equivalent reactance is according toCalculating an equivalent capacitance C, where p= -0.1, ω=314; performing dichotomy calculation according to the equivalent capacitance to calculate a group of cancellationArc circle control word;
step S5: and controlling the independent opening and closing module to output according to the arc suppression coil control word, namely switching to the corresponding compensation gear.
Further, the damping resistor intelligent switching control module is used for realizing switching control of the damping resistor, and comprises a zero sequence voltage collector, a driving circuit and a relay, wherein when the system normally operates, the zero sequence voltage is zero, the relay does not act, and the alternating current contactor S 4 Or S 8 Disconnecting; when the system generates single-phase earth fault, a zero-sequence voltage is generated, and when the zero-sequence voltage collector detects that the zero-sequence voltage is greater than a set threshold value, the relay is controlled to be attracted, so that the alternating-current contactor S 4 Or S 8 And closing, namely shorting the damping resistor, so that the arc suppression coil compensates according to the set compensation capacity.
The invention also provides a simulation method of the simulation system of the configuration type power distribution network movable mould mixed grounding mode, which comprises the following steps:
step S1: when a hybrid grounding mode of a neutral point ungrounded system and a neutral point grounded system with small resistance needs to be constructed, the alternating current contactor S of the second grounding unit is closed 5 And controls a group of contactors S of the second small-resistance equivalent module according to the grounding resistance value of the set small-resistance grounding system 71 、S 72 、S 73 、S 74 、S 75 The preparation method is finished;
step S2: when a hybrid grounding mode of a neutral point ungrounded system and a neutral point arc suppression coil grounding system needs to be constructed, the alternating current contactor S of the second grounding unit is closed 5 A group of contactors S of the second equivalent arc suppression coil module is controlled according to the set arc suppression coil compensation degree and the initial capacitance value of the configuration network 61 、S 62 、S 63 、S 64 、S 65 、S 66 、S 67 、S 68 The preparation method is finished;
step S3: when a hybrid grounding mode of the neutral point through the small-resistance grounding system and the neutral point through the small-resistance grounding system needs to be constructed, the alternating-current contactor S of the first grounding unit is closed 1 Ac contactor S with second grounding unit 5 And controls one group of contactors S of the first small-resistance equivalent module according to the grounding resistance values of the two groups of small-resistance grounding systems 31 、S 32 、S 33 、S 34 、S 35 A set of contactors S equivalent to a second set of small-resistance modules 71 、S 72 、S 73 、S 74 、S 75 The preparation method is finished;
step S4: when a hybrid grounding mode of a neutral point through arc suppression coil grounding system and a neutral point through arc suppression coil grounding system needs to be constructed, the alternating current contactor S of the first grounding unit is closed 1 Ac contactor S with second grounding unit 5 And controls a group of contactors S of the equivalent modules of the first group of arc suppression coils according to the compensation degree of the two groups of arc suppression coils 21 、S 22 、S 23 、S 24 、S 25 、S 26 、S 27 、S 28 Contactor S of equivalent module with second arc suppression coil 61 、S 62 、S 63 、S 64 、S 65 、S 66 、S 67 、S 68 The preparation method is finished;
step S5: when a hybrid grounding mode of a neutral point through a small-resistance grounding system and a neutral point through an arc suppression coil grounding system needs to be constructed, the alternating current contactor S of the first grounding unit is closed 1 Ac contactor S with second grounding unit 5 And a group of contactors S of the first small-resistance equivalent module are controlled according to the set grounding resistance value of the small-resistance grounding system and the compensation degree of the arc suppression coil 31 、S 32 、S 33 、S 34 、S 35 Contactor S of equivalent module with second arc suppression coil 61 、S 62 、S 63 、S 64 、S 65 、S 66 、S 67 、S 68 And (3) obtaining the product.
The simulation method of the configuration type power distribution network movable mould mixed grounding mode is simple to operate, does not need to change wiring, can conveniently realize the simulation of various mixed grounding modes such as the mixing of a neutral point non-grounding system and a neutral point through a small-resistance grounding system, the mixing of the neutral point non-grounding system and the neutral point through an arc suppression coil grounding system, the mixing of the neutral point through the small-resistance grounding system and the neutral point through the arc suppression coil grounding system, the mixing of the neutral point through the small-resistance grounding system, the mixing of the neutral point through the arc suppression coil grounding system and the like through local operation or remote control of an upper computer, can automatically adjust the arc suppression coil according to the system capacitance current and the set compensation degree when the system single-phase grounding fault occurs, and can realize stepless adjustment of the compensation degree of the arc suppression coil and the grounding resistance of the small-resistance grounding system in a certain range.
The invention has the following beneficial effects:
1. the method can flexibly simulate the hybrid grounding mode of the power distribution network, and can conveniently realize the simulation of various hybrid grounding modes such as the mixing of a neutral point non-connection system and a neutral point through a small-resistance grounding system, the mixing of a neutral point non-connection system and a neutral point through an arc suppression coil grounding system, the mixing of a neutral point through a small-resistance grounding system, the mixing of a neutral point through an arc suppression coil grounding system and the like through local operation or remote control of an upper computer;
2. the neutral point can be adjusted in a certain range in a stepless way through the grounding resistance of the small-resistance grounding system, the arc suppression coil compensation degree of the neutral point through the arc suppression coil grounding system and the like, the minimum resolution of the capacitance compensated by the arc suppression coil reaches 0.25uF, and the minimum resolution of the grounding resistance of the grounding system reaches 1 omega;
3. the wiring is not required to be changed on site, and the operation is simple.
Drawings
FIG. 1 is a diagram of a primary system of a movable mould of a conventional 690V power distribution network;
FIG. 2 is a schematic diagram of a simulation system for a hybrid mode of power distribution network configured according to the present invention;
FIG. 3 is a schematic diagram of a first low resistance equivalent module of the present invention;
FIG. 4 is a schematic diagram of a second small resistance equivalent module of the present invention;
FIG. 5 is a schematic diagram of a first equivalent arc suppression coil module of the present invention;
FIG. 6 is a schematic diagram of a second equivalent arc suppression coil module of the present invention;
FIG. 7 is a schematic diagram of a multimode ground controller according to the present invention;
fig. 8 is a schematic diagram of automatic compensation control of the arc suppression coil of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
FIG. 1 is a diagram of a power distribution network movable mode system employing 690V voltage class geometric simulation. The system is powered by a distribution transformer special for a laboratory, a 400V power supply is connected to a low-voltage wire inlet cabinet, and the power supply is divided into a plurality of power supply points through the low-voltage wire outlet cabinet, and two power supply points are shown in figure 1. The 400V outgoing line is connected into a 690V power distribution network movable mode system through a 0.4/0.69kV boosting isolation transformer and is used as a power supply point of the movable mode system. The connection mode of the step-up isolation transformer of 0.4/0.69kV is Y N And therefore, the whole movable mould system is a system without a neutral point, and if a small-resistance grounding system or an arc suppression coil grounding system is required to be constructed, a Z-shaped grounding transformer is required to be connected in parallel on the 690V power supply side to form the neutral point.
When a single-phase grounding fault occurs in a small-current grounding system, the fault current is mainly the capacitance current of the line to the ground, the simulated overhead line or cable is limited in length in consideration of the scale of the movable mould system, and the simulation overhead line or cable cannot be consistent with the actual site, so that the system is provided with an adjustable capacitor. During experiments, the capacitor can be connected in parallel to the 690V power supply side for simulating the capacitance current of the transformer substation, and can also be connected in parallel to the circuit for simulating the cable capacitor of the system, so that when single-phase earth fault simulation is performed, the network topology consistent with the actual site can be conveniently constructed.
The 690V power distribution network movable mould primary system mainly comprises a power supply system, a distribution line simulation unit, a switch, an adjustable capacitance unit, a fault simulation device, a grounding unit and the like.
The power supply system mainly comprises a boosting isolation transformer with the voltage of 0.4/0.69kV, and preferably, a current limiting resistor or a current limiting reactor is connected in series at the output side of the isolation transformer and used for limiting the short-circuit current of the system, and the isolation transformer is connected to a 690V movable mode system through the current limiting resistor or the current limiting reactor to serve as an infinite power point of the system.
The distribution line simulation unit comprises an overhead line simulation unit and a cable simulation unit, parameters of the overhead line and the cable simulation unit are calculated equivalently according to the real 10kV overhead line and cable parameters and the impedance simulation ratio, rated current is designed according to 200A, in order to form different distribution network grid structures, the overhead line or the cable is formed into each module according to different length specifications, and a laboratory can flexibly select a line module according to network topology.
The switch uses a circuit breaker or an alternating current contactor with electric operation to perform equivalent simulation and is used for constructing different power distribution network topologies or different operation modes.
The adjustable capacitor unit is mainly used for making up the defect that the capacitance current to the ground is smaller when the cable of the movable mould system is limited in simulation length and single-phase grounding is in fault, and the capacitor can be connected in parallel to a power supply side or a circuit in an experiment.
The fault simulation device is mainly used for simulating various typical faults of the distribution network, such as single-phase grounding faults, two-phase short-circuit grounding faults, three-phase short-circuit faults and three-phase short-circuit grounding faults.
The grounding unit is mainly used for constructing various grounding scenes, such as a neutral point non-grounding system, a neutral point traditional low-current grounding system such as a neutral point grounding system with an arc suppression coil, and various mixed grounding scenes such as a low-resistance grounding system closed loop, an arc suppression coil grounding system closed loop, a low-resistance grounding system and an arc suppression coil grounding system closed loop.
In order to solve the problems that the neutral point grounding mode of the conventional power distribution network movable mould system is single, an experimental scene of a hybrid grounding mode cannot be flexibly constructed, and arc suppression coil parameters cannot be well matched when the capacitance and current of the system change, the invention provides a simulation system of the hybrid grounding mode of the configuration power distribution network movable mould, which comprises a first grounding transformer 1, a second grounding transformer 2, a first small resistance equivalent module 3 and a second small resistance equivalent module 4 with stepless adjustable resistances, a first equivalent arc suppression coil module 5 and a second equivalent arc suppression coil module 6 with stepless adjustable compensation degrees of the arc suppression coils, a plurality of alternating current contactors, a plurality of current transformers and a multimode grounding controller, as shown in figure 2.
One end of the first small-resistance equivalent module and the first equivalent arc suppression coil module which are connected in parallel is connected with a first current transformer CT 1 Connected with the other end grounded, the first current transformer CT 1 The other end of the first grounding transformer is connected with the alternating current contactor S 1 Connection of the AC contactor S 1 And the other end of the third current transformer CT 3 The first grounding unit is formed by connection;
one end of the second small-resistance equivalent module and the second equivalent arc suppression coil module which are connected in parallel is connected with a second current transformer CT 2 Connected with the other end grounded, the second current transformer CT 2 The other end of the second grounding transformer is connected with the AC contactor S 5 Connection of the AC contactor S 5 And the other end of the current transformer CT 4 And the second grounding unit is formed by connection.
The grounding transformer is mainly used for forming a neutral point, and is used for constructing a small-resistance grounding system for the neutral point and an arc suppression coil grounding system for the neutral point, and the capacity of the grounding transformer is comprehensively designed according to the capacity of the arc suppression coil and the current flowing through the grounding resistor; meanwhile, the invention needs to realize the simulation of a mixed grounding mode, so that the invention needs to be provided with two grounding transformers.
The small-resistance equivalent modules (a first small-resistance equivalent module and a second small-resistance equivalent module) are grounding resistors of a small-resistance grounding system, the two groups of small-resistance equivalent modules can be flexibly configured according to requirements, and the principle is shown in fig. 3 and 4.
The principle of the first small resistance equivalent module is described below, and as shown in FIG. 3, the small resistance equivalent module is composed of 5 resistors R 11 、R 12 、R 13 、R 14 、R 15 With 5 ac contactors S 31 、S 32 、S 33 、S 34 、S 35 Composition is prepared. Preferably, R is taken 11 ＝1Ω、R 12 ＝2Ω、R 13 ＝4Ω、R 14 ＝8Ω、R 15 =16Ω, in combination with five ac contactors S 11 、S 12 、S 13 、S 14 、S 15 Can realize R 1 And adjusting the grounding resistance from 1 omega to 31 omega, wherein the adjusting step size is 1 omega. If the configuration with the grounding resistance of 13 omega is needed to be realized, the alternating current contactor S is closed 32 And S is equal to 35 Can be realized; if the configuration with 23 omega grounding resistance is needed, the AC contactor S is closed 34 And the method can be realized. The ground resistance can be flexibly configured from 1Ω to 31Ω.
The equivalent arc suppression coil module is formed by serially connecting a damping resistor and a reactor, as shown in figure 2, R in the first grounding unit 2 For damping resistance X 1 Is a reactor. The damping resistor is mainly used for preventing series resonance caused when the inductance current compensated by the arc suppression coil is equal or approximately equal to the capacitance current to ground of the system when the system suffers single-phase grounding fault. When the system is operating normally, the damping resistor is put into operation, as shown in FIG. 1, the AC contactor S 4 Disconnecting; immediately closing S when a single-phase earth fault occurs in the system, i.e. an offset voltage (zero sequence voltage) is detected at the neutral point 4 Namely, the damping resistor is short-circuited, so that the arc suppression coil compensates according to the set compensation capacity. In order to simulate the capacitance current change or the arc suppression coil compensation degree change, the invention designs an equivalent arc suppression coil module shown in fig. 5 and 6.
The principle of the first equivalent arc suppression coil module is described below, and as shown in FIG. 5, the equivalent arc suppression coil module is composed of 8 reactance X 11 、X 12 、X 13 、X 14 、X 15 、X 16 、X 17 、X 18 With 8 ac contactors S 21 、S 22 、S 23 、S 24 、S 25 、S 26 、S 27 、S 28 Composition is prepared. Wherein X is 18 Maximum, and X 17 ＝2 1 *X 18 、X 16 ＝2 2 *X 18 、X 15 ＝2 3 *X 18 、X 14 ＝2 4 *X 18 、X 13 ＝2 5 *X 18 、X 12 ＝2 6 *X 18 、X 11 ＝2 7 *X 18 The method comprises the steps of carrying out a first treatment on the surface of the The capacitance current of the corresponding system is the minimum when the reactance is the maximum, namely X 11 Preferably, the capacitance is taken to be the capacitance current corresponding to 0.25 μf, and the capacitance current corresponding to the system is the largest when the reactance is the smallest (all the reactances are connected in parallel), namely 255×0.25 μf=63.75 μf. The maximum capacitance current at this time is:
in the above, U x The line voltage of the movable mode system is 690V.
The inductive current provided by the equivalent arc suppression coil module is as follows:
when the system has a single-phase metallic (the fault transition resistance is 0 omega) ground fault, the capacitive current is as follows:
in U N The system voltage, ω is frequency, and C is capacitance.
The arc suppression coil compensation degree p is defined as follows:
I L ＝(1+p)×I C
as shown in the above formula, when p < 0, i.e. I L <I C When the system is in an under-compensation state; when p=0, i.e. I L ＝I C When the system is in a full compensation state; when p=0, i.e. I L ＞I C When the system is in a fully compensated state.
To be combined, arc extinctionCoil reactance X L The method comprises the following steps:
preferably, taking p= -0.1, then X 11 (corresponding to 0.25 uF) is:
similarly, X 12 、X 13 、X 14 、X 15 、X 16 、X 17 、X 18 The calculations may be performed similarly (0.5 uF, 1uF, 2uF, 4uF, 8uF, 16uF, 32uF, respectively).
All the alternating current contactors of the equivalent arc suppression coil module are closed, and the compensation of the capacitance current with the value of 63.75 mu F can be realized.
The current transformer is mainly used for collecting three-phase current and zero-sequence current, zero-sequence voltage and zero-sequence current are not generated when the system normally operates, when a single-phase earth fault occurs in the system, offset voltage is generated at a neutral point, and the alternating current contactor of the equivalent arc suppression coil module is rapidly switched according to the size of the collected zero-sequence current and the size of the compensation degree so as to achieve the compensation effect.
The multimode grounding controller mainly completes the functions of setting a mixed grounding scene, communication, GPS time setting, intelligent wind speed control, damping resistor intelligent switching control and the like. The principle of the multimode grounding controller is shown in fig. 7, and the multimode grounding controller mainly comprises an ARM microprocessor, a communication module, a time setting module, a human-computer interface module, an intelligent wind speed adjusting module, an interlocking opening module, an independent opening module, an arc suppression coil automatic compensation control module, a damping resistor intelligent switching control module and a local/remote control module.
The ARM microprocessor is a core of the multimode grounding controller and is used for cooperatively controlling the work of each sub-module.
The communication module is a 1-path 10/100M network port and 1-path RS485 serial port upper computer, and realizes the control of the multimode grounding controller through the network port or the serial port, and the construction of various grounding modes and mixed grounding mode scenes.
The time synchronization module mainly realizes IRIG-B time synchronization of the multimode grounding controller, IRIG-B is transmitted in an RS485 level mode, IRIG-B signals are respectively input to RS485 of the time synchronization module, and accurate time synchronization of the multimode grounding controller is realized; preferably, the upper computer also performs network time synchronization through the GPS device, so that the upper computer and the multimode grounding controller keep the same time reference, and when timing start is required, the multimode grounding controller controls the corresponding module to quickly form a structure of the hybrid grounding scene after the upper computer sends a timing time.
The intelligent wind speed adjusting module comprises a temperature detecting module and a fan control module, wherein the temperature detecting module collects the temperature of the ARM microprocessor, the fan runs at a low speed to keep the working environment quiet during normal operation, and when the temperature of the ARM microprocessor reaches a set threshold value, the fan control module controls the rotation speed of the fan to be automatically accelerated so as to improve the heat dissipation capacity.
The man-machine interface module mainly comprises buttons, knobs, liquid crystal displays and the like, and can realize the arrangement of different grounding scenes through a human-to-ground interface, such as the structures of various grounding scenes of mixed grounding of a small-resistance grounding system, mixed grounding of a neutral point ungrounded system and an arc suppression coil grounding system, mixed grounding of a small-resistance grounding system and an arc suppression coil grounding system and the like; meanwhile, maintenance work such as setting of communication parameters of the controller can be completed through the human-computer interface module.
The interlocking opening module mainly completes the selection of the neutral point grounding mode type, because the neutral point grounding mode is unique, the grounding mode selection switch control of each grounding unit is interlocked for safety, namely, the neutral point is not grounded, the neutral point is grounded through a small resistance grounding system, and the neutral point is grounded through an arc suppression coil grounding system and only one of the neutral point grounding modes can be selected, the invention is realized by adopting the interlocking opening module to control the alternating current contactor, and the alternating current contactor S of the first grounding unit is shown in figure 2 1 、S 2 、S 3 Ac contactor S with second grounding unit 5 、S 6 、S 7 Etc. The interlocking opening module mainly comprises a 3-8 decoder, a driving circuit and a relay, the output of 8 groups of interlocking signals can be realized through 3 GPIO ports of an ARM microprocessor, the driving voltage is increased to 12V through the driving circuit and then is connected to a 12V relay to realize the output of 8 groups of opening signals, the opening signals are a pair of passive dry nodes, and the control of an alternating current contactor can be realized by connecting a 220V power supply in series and then connecting the coil of the alternating current contactor. AC contactor S of two sets of interlocking opening modules and first grounding unit 1 、S 2 、S 3 S with the second grounding unit 5 、S 6 、S 7 After connection, two groups of alternating current contactors S can be realized 1 、S 2 、S 3 And S is equal to 5 、S 6 、S 7 And the interlocking control is performed, so that different neutral point grounding modes are flexibly constructed.
The independent opening module is mainly used for realizing the gear switching and switching control of the grounding resistance of the small-resistance simulation assembly and the reactor of the arc suppression coil simulation assembly. As shown in fig. 3, 4, 5 and 6, each small resistance analog component is controlled by 5 ac contactors and each arc suppression coil analog component is controlled by 8 ac contactors in a combined manner to realize the selection of the compensation capacity of the grounding resistance and the arc suppression coil. Likewise, the independent opening module is composed of a driving circuit and a relay, and the connection mode is similar to that of the interlocking opening module, and is not repeated here. When the method is implemented, a local human-computer interface or an upper computer is used for setting the resistance value of a small-resistance grounding resistor and the compensation capacity of an arc suppression coil, and a microprocessor receives the set initial value and then automatically controls 26 groups of independent opening modules to realize the initialization setting of a scene;
the automatic compensation control module of the arc suppression coil is mainly used for realizing automatic compensation of the arc suppression coil, and the ARM microprocessor automatically calculates inductance current to be compensated according to the acquired zero sequence current and the set compensation degree of the arc suppression coil and sends a control instruction to the independent opening module; the flow is shown in fig. 8.
Step S1: setting the compensation degree of the arc suppression coil through a local human-computer interface or an upper computer;
step S2: collecting zero sequence current, and when the offset voltage of the collected neutral point is greater than a certain threshold value, collecting zero sequence current according to I L ＝(1+p)×I C The inductance current to be compensated of the equivalent arc suppression coil is calculated, and the zero sequence current at the position of the single-phase earth fault is the capacitance current I c ；
Step S3: inductor current I compensated according to need L Calculating equivalent reactance with zero sequence voltage;
step S4: for ease of calculation, the equivalent reactance is followedThe equivalent capacitance is calculated by p= -0.1, namely the equivalent capacitance can be calculated according to a dichotomy, and a group of arc suppression coil control words (corresponding to the control values of 8 opening modules) are calculated;
step S5: and controlling the independent opening and closing module to output according to the control word, namely switching to the corresponding compensation gear.
The intelligent switching control module of the damping resistor is mainly used for realizing switching control of the damping resistor, and mainly comprises a zero sequence voltage collector (namely a transformer), a driving circuit and a relay. When the system is operating normally, the zero sequence voltage is zero, the relay is not operated, and the AC contactor S of FIG. 2 4 Or S 8 Disconnecting; when the system generates single-phase earth fault, zero sequence voltage is generated, and when the zero sequence voltage collector detects that the zero sequence voltage is greater than a set threshold value, the relay is controlled to be attracted, so that the alternating current contactor S of fig. 2 4 Or S 8 And closing, namely shorting the damping resistor, so that the arc suppression coil compensates according to the set compensation capacity.
In particular, because the system normally operates when the configuration network is initialized, the system does not have zero sequence voltage and zero sequence current, and only compensates when a single-phase grounding fault occurs, and because the time for calculation and control is also provided during the compensation, when the arc suppression coil grounding system is established, the arc suppression coil is firstly set according to the capacitance value of the network, and when the system has the single-phase grounding fault, the system compensates according to the magnitude of the zero sequence current.
The invention provides a simulation method of a simulation system of the configuration type power distribution network movable mould mixed grounding mode, which comprises the following steps:
step S1: when a hybrid grounding mode of a neutral point ungrounded system and a neutral point grounded system with small resistance needs to be constructed, the alternating current contactor S of the second grounding unit is closed 5 And controls a group of contactors S of the second small-resistance equivalent module according to the grounding resistance value of the set small-resistance grounding system 71 、S 72 、S 73 、S 74 、S 75 The preparation method is finished;
step S2: when a hybrid grounding mode of a neutral point ungrounded system and a neutral point arc suppression coil grounding system needs to be constructed, the alternating current contactor S of the second grounding unit is closed 5 A group of contactors S of the second equivalent arc suppression coil module is controlled according to the set arc suppression coil compensation degree and the initial capacitance value of the configuration network 61 、S 62 、S 63 、S 64 、S 65 、S 66 、S 67 、S 68 The preparation method is finished;
step S3: when a hybrid grounding mode of the neutral point through the small-resistance grounding system and the neutral point through the small-resistance grounding system needs to be constructed, the alternating-current contactor S of the first grounding unit is closed 1 Ac contactor S with second grounding unit 5 And controls one group of contactors S of the first small-resistance equivalent module according to the grounding resistance values of the two groups of small-resistance grounding systems 31 、S 32 、S 33 、S 34 、S 35 A group of contactors S equivalent to the second small resistance module 71 、S 72 、S 73 、S 74 、S 75 The preparation method is finished;
step S4: when a mixed grounding mode of a neutral point through arc suppression coil grounding system and a neutral point through arc suppression coil grounding system needs to be constructed, the first switch is closedAC contactor S of grounding unit 1 Ac contactor S with second grounding unit 5 And controls a group of contactors S of the first arc suppression coil equivalent module according to the set two groups of arc suppression coil compensation degrees 21 、S 22 、S 23 、S 24 、S 25 、S 26 、S 27 、S 28 Contactor S of equivalent module with second arc suppression coil 61 、S 62 、S 63 、S 64 、S 65 、S 66 、S 67 、S 68 The preparation method is finished;
step S5: when a hybrid grounding mode of a neutral point through a small-resistance grounding system and a neutral point through an arc suppression coil grounding system needs to be constructed, the alternating current contactor S of the first grounding unit is closed 1 Ac contactor S with second grounding unit 5 And a group of contactors S of the first small-resistance equivalent module are controlled according to the set grounding resistance value of the small-resistance grounding system and the compensation degree of the arc suppression coil 31 、S 32 、S 33 、S 34 、S 35 Contactor S of equivalent module with second arc suppression coil 61 、S 62 、S 63 、S 64 、S 65 、S 66 、S 67 、S 68 And (3) obtaining the product.
Claims (8)
1. The simulation method of the configuration type power distribution network movable mould mixed grounding mode is characterized by adopting a simulation system of the configuration type power distribution network movable mould mixed grounding mode, wherein the system comprises a first grounding transformer, a second grounding transformer, a first small resistance equivalent module and a second small resistance equivalent module with stepless adjustable resistances, a first equivalent arc suppression coil module and a second equivalent arc suppression coil module with stepless adjustable arc suppression coil compensation degrees, a plurality of alternating current contactors and a plurality of current transformers;
one end of the first small-resistance equivalent module and the first equivalent arc suppression coil module which are connected in parallel is connected with a first current transformer CT 1 Connected with the other end grounded, the first current transformer CT 1 The other end of the first grounding transformer is connected withFlow contactor S 1 Connection of the AC contactor S 1 And the other end of the third current transformer CT 3 The first grounding unit is formed by connection;
one end of the second small-resistance equivalent module and the second equivalent arc suppression coil module which are connected in parallel is connected with a second current transformer CT 2 Connected with the other end grounded, the second current transformer CT 2 The other end of the second grounding transformer is connected with the AC contactor S 5 Connection of the AC contactor S 5 And the other end of the current transformer CT 4 The second grounding unit is formed by connection;
the first small-resistance equivalent module comprises 5 resistors R 11 、R 12 、R 13 、R 14 、R 15 And 5 AC contactors S 31 、S 32 、S 33 、S 34 、S 35 Five resistors are connected in series, and two ends of each resistor are connected with an alternating current contactor in parallel;
the second small-resistance equivalent module comprises 5 resistors R 31 、R 32 、R 33 、R 34 、R 35 And 5 AC contactors S 71 、S 72 、S 73 、S 74 、S 75 Five resistors are connected in series, and two ends of each resistor are connected with an alternating current contactor in parallel;
the first equivalent arc suppression coil module comprises 8 reactors X 11 、X 12 、X 13 、X 14 、X 15 、X 16 、X 17 、X 18 And 8 AC contactors S 21 、S 22 、S 23 、S 24 、S 25 、S 26 、S 27 、S 28 One reactor is connected in series with an alternating current contactor, and then all the reactors are connected in parallel and then connected with a damping resistor R 2 Series connection of damping resistors R 2 Is connected with an alternating current contactor S in parallel at two ends 4 ；
The second equivalent arc suppression coil module comprises 8 reactors X 21 、X 22 、X 23 、X 24 、X 25 、X 26 、X 27 、X 28 And 8 AC contactors S 61 、S 62 、S 63 、S 64 、S 65 、S 66 、S 67 、S 68 One reactor is connected in series with an alternating current contactor, and then all the reactors are connected in parallel and then connected with a damping resistor R 4 Series connection of damping resistors R 4 Is connected with an alternating current contactor S in parallel at two ends 8 ；
The simulation method of the simulation system of the configuration type power distribution network movable mould mixed grounding mode comprises the following steps:
step S1: when a hybrid grounding mode of a neutral point ungrounded system and a neutral point grounded system with small resistance needs to be constructed, the alternating current contactor S of the second grounding unit is closed 5 And controls a group of contactors S of the second small-resistance equivalent module according to the grounding resistance value of the set small-resistance grounding system 71 、S 72 、S 73 、S 74 、S 75 The preparation method is finished;
step S2: when a hybrid grounding mode of a neutral point ungrounded system and a neutral point arc suppression coil grounding system needs to be constructed, the alternating current contactor S of the second grounding unit is closed 5 A group of contactors S of the second equivalent arc suppression coil module is controlled according to the set arc suppression coil compensation degree and the initial capacitance value of the configuration network 61 、S 62 、S 63 、S 64 、S 65 、S 66 、S 67 、S 68 The preparation method is finished;
step S3: when a hybrid grounding mode of the neutral point through the small-resistance grounding system and the neutral point through the small-resistance grounding system needs to be constructed, the alternating-current contactor S of the first grounding unit is closed 1 Ac contactor S with second grounding unit 5 And controls one group of contactors S of the first small-resistance equivalent module according to the grounding resistance values of the two groups of small-resistance grounding systems 31 、S 32 、S 33 、S 34 、S 35 A group of contactors S equivalent to the second small resistance module 71 、S 72 、S 73 、S 74 、S 75 The preparation method is finished;
step S4: when (when)When it is necessary to construct a hybrid grounding system of a neutral point-via-arc suppression coil grounding system and a neutral point-via-arc suppression coil grounding system, the ac contactor S of the first grounding unit is closed 1 Ac contactor S with second grounding unit 5 And controls a group of contactors S of the first arc suppression coil equivalent module according to the set two groups of arc suppression coil compensation degrees 21 、S 22 、S 23 、S 24 、S 25 、S 26 、S 27 、S 28 Contactor S of equivalent module with second arc suppression coil 61 、S 62 、S 63 、S 64 、S 65 、S 66 、S 67 、S 68 The preparation method is finished;
step S5: when a hybrid grounding mode of a neutral point through a small-resistance grounding system and a neutral point through an arc suppression coil grounding system needs to be constructed, the alternating current contactor S of the first grounding unit is closed 1 Ac contactor S with second grounding unit 5 And a group of contactors S of the first small-resistance equivalent module are controlled according to the set grounding resistance value of the small-resistance grounding system and the compensation degree of the arc suppression coil 31 、S 32 、S 33 、S 34 、S 35 Contactor S of equivalent module with second arc suppression coil 61 、S 62 、S 63 、S 64 、S 65 、S 66 、S 67 、S 68 And (3) obtaining the product.
2. The simulation method of a hybrid grounding mode of a movable mode of a configuration power distribution network according to claim 1, further comprising a multimode grounding controller, wherein the multimode grounding controller comprises an ARM microprocessor, a communication module, a time setting module, a man-machine interface module, an intelligent wind speed adjustment control module, an interlocking opening module, an independent opening module, an arc suppression coil automatic compensation control module, a damping resistor intelligent switching control module and a local/remote control module.
3. The simulation method of a hybrid grounding mode of a movable mode of a configuration power distribution network according to claim 2, wherein the interlocking opening module is used for completing the selection of a neutral point grounding mode type and is realized by controlling an alternating current contactor.
4. The simulation method of the hybrid grounding mode of the movable mode of the configuration type power distribution network according to claim 3, wherein the interlocking opening module comprises a 3-8 decoder, a driving circuit and a relay, wherein the output of 8 groups of interlocking signals is realized through 3 GPIO ports of an ARM microprocessor, the driving voltage is increased to 12V through the driving circuit and then is connected to a 12V relay to realize the output of 8 groups of opening signals, the opening signals are a pair of passive dry nodes, and a 220V power supply is connected in series and then is connected to a coil of an alternating current contactor to realize the control of the alternating current contactor; AC contactor S for interlocking two groups of opening modules with first grounding unit 1 、S 2 、S 3 And an ac contactor S of a second grounding unit 5 、S 6 、S 7 Connection, AC contactor S 2 And S is 3 Parallel connection and AC contactor S 1 Series connection of AC contactors S 6 And S is 7 Parallel connection and AC contactor S 5 Series connection of two groups of alternating current contactors S 1 、S 2 、S 3 And S is equal to 5 、S 6 、S 7 And the interlocking control is performed, so that different neutral point grounding modes are flexibly constructed.
5. The simulation method of the hybrid grounding mode of the movable mode of the configuration power distribution network according to claim 2, wherein the independent opening module is used for realizing the gear switching and switching control of the grounding resistance in the small-resistance equivalent module and the reactor in the equivalent arc suppression coil module.
6. The simulation method of the hybrid grounding mode of the movable mode of the power distribution network according to claim 2, wherein the automatic compensation control module of the arc suppression coil is used for realizing the automatic compensation of the arc suppression coil, and the ARM microprocessor automatically calculates the inductance current to be compensated according to the collected zero sequence current and the set compensation degree of the arc suppression coil and sends a control instruction to the independent opening module.
7. The simulation method of a hybrid grounding mode of a movable mould of a configuration power distribution network according to claim 6, wherein the automatic compensation control module of the arc suppression coil performs the following steps:
step S1: setting the compensation degree p of the arc suppression coil through a local human-computer interface or an upper computer;
step S2: collecting zero sequence current, when the offset voltage of the collected neutral point is larger than a set threshold value, according to I L ＝(1+p)×I C Inductance current I required to be compensated for calculating equivalent arc suppression coil L The zero sequence current at the single-phase earth fault is the capacitance current I c ；
Step S3: inductor current I compensated according to need L Calculating equivalent reactance with zero sequence voltage;
step S4: the equivalent reactance is according toCalculating an equivalent capacitance C, where p= -0.1, ω=314; performing dichotomy calculation according to the equivalent capacitance, and calculating a group of arc suppression coil control words;
step S5: and controlling the independent opening and closing module to output according to the arc suppression coil control word, namely switching to the corresponding compensation gear.
8. The simulation method of the hybrid grounding mode of the movable mould of the configuration power distribution network according to claim 2, wherein the damping resistor intelligent switching control module is used for realizing switching control of the damping resistor, and comprises a zero sequence voltage collector, a driving circuit and a relay, wherein when the system is in normal operation, the zero sequence voltage is zero, the relay does not act, and the alternating current contactor S 4 Or S 8 Disconnecting; when the system generates single-phase earth fault, a zero-sequence voltage is generated, and when the zero-sequence voltage collector detects that the zero-sequence voltage is greater than a set threshold value, the relay is controlled to be attracted, so that the alternating-current contactor S 4 Or S 8 Closing, namely, shorting the damping resistor,the arc suppression coil is compensated according to the set compensation capacity.
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