CN105207208B - Realize power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc simultaneously - Google Patents
Realize power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc simultaneously Download PDFInfo
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- CN105207208B CN105207208B CN201510602073.2A CN201510602073A CN105207208B CN 105207208 B CN105207208 B CN 105207208B CN 201510602073 A CN201510602073 A CN 201510602073A CN 105207208 B CN105207208 B CN 105207208B
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Abstract
Realize power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc simultaneously, it is characterised in that：Including：Parallel three phase module and the first coupling transformer, it is used to compensate to provide active power balance inside circuit and by the way that the first coupling transformer is idle to circuit when carrying out power flowcontrol, is used to provide zero sequence compensation electric current for small current grounding fault when carrying out active compensation extinguishing arc；Three-phase series module and the second coupling transformer are inserted into voltage to distribution system circuit by the second coupling transformer when carrying out power flowcontrol and change trend flowing；Dc bus voltage regulation unit links together three-phase connection in series-parallel module, for providing steady dc voltage for the DC side of three-phase connection in series-parallel module.It realizes power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc simultaneously, by parallel three phase module, three-phase series module and dc bus voltage regulation unit, the function of power flowcontrol and small current grounding fault active compensation can be achieved at the same time.
Description
Technical field
It realizes power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc simultaneously, belongs to intermediate distribution system neck
Domain.
Background technology
With the development of science and technology and social progress, various distributed generation resources are increasing, cause power distribution network scale
Constantly expand, the method for operation is increasingly complicated.Early stage only in transmission system there are serious trend flow field problem, in recent years due to
In a large amount of input distribution systems of distributed generation resource and microgrid, the trend flow field problem of distribution system becomes more serious.Simultaneously
Earth fault occurs often in intermediate distribution system, and distribution system is caused to impact or even cause power outage.In earth fault
Middle about 70% failure is transient single-phase earth fault, and for small current neutral grounding system, system can be transported with singlephase earth fault
Row two hours, but when current in the fault point is larger, electric arc is difficult to self-extinguish, easily generates fault overvoltage, causes multiple thing
Therefore transformer and switchgear may be burnt, cause large area blackout, cause great economic loss.
For the power flowcontrol problem of intermediate distribution system, the existing power electronics applied to transmission system can be utilized
Device UPFC（THE UPFC）, UPFC can preferably solve the various work(such as voltage fluctuation, reactive-load compensation, power flowcontrol
Can, but earth fault can not be handled.To reduce single-phase earth fault current, the power grid generally use of portion voltage grade
Neutral non-effective grounding mode, including isolated neutral and through grounding through arc, when singlephase earth fault occurs therefore
It is smaller to hinder electric current, power grid can be allowed to continue a period of time that operates with failure, however small current grounding fault may lead to electric arc
Extinguish, restrike, can so cause larger system overvoltage repeatedly, cause great hazardous accidents.Therefore to small current neutral grounding
Failure carries out active compensation extinguishing arc, by Single-phase Ground Connection Failure current compensation to zero, it is ensured that 100% blow-out of trouble point has important
Meaning.
Invention content
The technical problem to be solved by the present invention is to：Overcome the deficiencies of the prior art and provide it is a kind of by parallel three phase module,
Three-phase series module and dc bus voltage regulation unit, can be achieved at the same time power flowcontrol and small current grounding fault active compensation disappears
The circuit of arc.
The technical solution adopted by the present invention to solve the technical problems is：This realizes power flowcontrol and small current neutral grounding simultaneously
The circuit of failure active compensation extinguishing arc, it is characterised in that：Including：
First coupling transformer, three groups of primary side windings be connected in parallel on respectively distribution system A, B, C three-phase line and ground terminal it
Between, the former secondary of the first coupling transformer uses star direct grounding way；
Parallel three phase module, including exchange side and DC side, exchange side respectively with the first coupling transformer vice-side winding
It is connected, the reactive-load compensation of power grid and active compensation extinguishing arc is realized for passing through the first coupling transformer；
Dc bus voltage regulation unit, one end are connected with the DC side of parallel three phase module, be used to implement DC voltage-stabilizing and
Channel is provided for output zero sequence compensation electric current；
Three-phase series module, including exchange side and DC side, the other end phase of DC side and dc bus voltage regulation unit
Even, for passing through the second coupling transformer voltage change trend flowing is inserted into distribution system；
Second coupling transformer, primary side winding are connected between three-phase series module exchange side and ground terminal, secondary
Side winding is connected on respectively in distribution system A, B, C three-phase line.
Preferably, the parallel three phase module includes parallel three phase filter unit, the three-phase for filtering out higher hamonic wave
Current transforming unit in parallel and the current control unit controlled parallel three phase current transforming unit；The friendship of parallel three phase current transforming unit
Side is flowed by parallel filtering unit connection first coupling transformer, described in the DC side connection of parallel three phase current transforming unit
Dc bus voltage regulation unit.
Preferably, the three-phase series module includes humorous for filtering out high order in three-phase series current transforming unit output voltage
Series filtering unit, three-phase series current transforming unit and the voltage control list controlled three-phase series current transforming unit of wave
Member；The exchange side of three-phase series current transforming unit connects the primary side winding of second coupling transformer by series filtering unit,
Dc bus voltage regulation unit described in the DC side connection of three-phase series current transforming unit.
Preferably, the parallel three phase current transforming unit uses three phase bridge all control circuit, including IGBT pipes G1 ~ G6 and
The collection of diode D1 ~ D6, parallel three phase current transforming unit DC side anode while parallel IGBT pipe G1, IGBT pipe G3, IGBT pipe G5
The emitter of electrode, parallel three phase current transforming unit DC side cathode while parallel IGBT pipe G2, IGBT pipe G4, IGBT pipe G6；
The emitter of IGBT pipe G1, IGBT pipe G3, IGBT pipes G5 connects the collector of IGBT pipe G2, IGBT pipe G4, IGBT pipes G6 respectively
And the exchange side for drawing parallel three phase current transforming unit respectively is connected with parallel filtering unit；
The cathode of diode D1 ~ D6 connects the collector of IGBT pipes G1 ~ G6 respectively, and the anode of diode D1 ~ D6 connects respectively
The emitter of IGBT pipes G1 ~ G6 is connect, the gate pole of IGBT pipes G1 ~ G6 is connected simultaneously with the current control unit.
Preferably, the parallel filtering unit uses the parallel three phase LC being made of capacitance C1 ~ C3 and inductance L1 ~ L3
Second-order filter circuit, the three groups of vice-side windings difference shunt inductance L1 and capacitance C1, inductance L2 and capacitance of the first coupling transformer
C2 and one end of inductance L3 and capacitance C3, the other end ground connection of capacitance C1 ~ C3, the other end of inductance L1 ~ L3 connect three respectively
Be in parallel the exchange side of current transforming unit.
Preferably, the three-phase series current transforming unit use three phase bridge all control circuit, including IGBT pipes G1 ' ~ G6 ' with
And diode D1 ' ~ D6 ', parallel IGBT pipe G1 ', IGBT pipes G3 ', IGBT are managed three-phase series current transforming unit DC side anode simultaneously
The collector of G5 ', three-phase series current transforming unit DC side cathode parallel IGBT pipe G2 ', IGBT pipes G4 ', IGBT pipes G6 ' simultaneously
Emitter, IGBT pipes G1 ', IGBT pipes G3 ', IGBT pipes G5 ' emitter connect IGBT pipes G2 ', IGBT pipes G4 ', IGBT respectively
The collector of pipe G6 ' and respectively draw three-phase series current transforming unit exchange side be connected with series filtering unit；
Cathode difference parallel IGBT pipe G1 ' ~ G6 ' collectors of diode D1 ' ~ D6 ', the anode point of diode D1 ' ~ D6 '
The emitter of other parallel IGBT pipe G1 ' ~ G6 ', IGBT pipes G1 ' ~ G6 ' gate poles are connected simultaneously with the voltage control unit.
Preferably, the series filtering unit includes the three-phase series LC being made of capacitance C4 ~ C6 and inductance L4 ~ L6
Second-order filter circuit, parallel connection second couples transformation respectively after exchange side difference series inductance L4 ~ L6 of three-phase series current transforming unit
One end of three groups of primary side windings of device and one end of capacitance C4 ~ C6, the other end ground connection of capacitance C4 ~ C6, the second coupling transformer
The other end of three groups of primary side windings is by switching K2 ground connection.
Preferably, support dc bus side voltage when the dc bus voltage regulation unit is included in active compensation extinguishing arc
Double accumulators and double-energy storage element, double-energy storage element centre are drawn center line and are directly grounded, and are provided for output zero sequence compensation electric current
Channel.
Preferably, double accumulators be storage batteries D C1 and DC2, the double-energy storage element for storage capacitor C7 ~
C8；
The anode while the anode of multiple-connected battery DC1, one end of capacitance C7 and three-phase of parallel three phase module DC side
The anode of the DC side of serial module structure, the cathode of parallel three phase module DC side while cathode, the capacitance C8 of multiple-connected battery DC2
One end and three-phase series module DC side cathode, ground terminal simultaneously multiple-connected battery DC1 cathode, storage batteries D C2
Anode and capacitance C7 ~ C8 the other end, between capacitance C7 and C8 draw center line be directly grounded.
Preferably, the former vice-side winding of second coupling transformer directly connects mode using star neutral point.
Compared with prior art, advantageous effect possessed by the present invention is：
1st, power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc are realized by this simultaneously, by three-phase simultaneously
Gang mould block, three-phase series module and dc bus voltage regulation unit, power flowcontrol and small current grounding fault, which can be achieved at the same time, to be had
The function of source compensation.It is straight by parallel three phase module and dc bus voltage regulation unit when singlephase earth fault occurs for power grid
Required zero sequence compensation electric current can be injected to power grid by flowing accumulator, and current in the fault point is compensated to zero, and the reduction injection that is delayed
Whether electric current failure judgement is restored.The timely self-healing of transient fault energy, permanent fault then carry out isolation repair.It is not breaking down
When, it can be charged by parallel three phase module for dc bus side storage capacitor, voltage be inserted into power grid by three-phase series module
To change power flow distribution, raising electric power utilization ratio.
2nd, parallel three phase current transforming unit uses three phase bridge all control circuit, has higher switching frequency, can be operated in
Rectification state and inverter mode, when power grid non-failure, are operated in rectification state and are carried out for the capacitor in dc bus voltage regulation unit
Charging, stable DC bus bar side voltage and compensates the reactive power of circuit by first coupling transformer in parallel.When
Parallel three phase current transforming unit is operated in inverter mode when singlephase earth fault occurring in power grid, is carried out to power grid injection zero-sequence current
Active compensation extinguishing arc.
3rd, three-phase series current transforming unit equally uses IGBT and diode inverse parallel equally using three phase bridge all control circuit
As switching device, there is higher switching frequency.The primary side of the exchange side of series AC unit and the second coupling transformer around
Group is connected, and voltage is inserted into power grid to change the amplitude of circuit output terminal voltage and phase by the second coupling transformer, so as to
The distribution of load disturbance.
4th, parallel three phase mould parallel filtering unit in the block, is used for when parallel three phase current transforming unit is operated in rectification state
The higher hamonic wave of power grid inflow is filtered out, is used to filter out output zero sequence compensation when parallel three phase current transforming unit is operated in inverter mode
The higher hamonic wave as caused by switching device opens shutdown in electric current.
5th, three-phase series mould series filtering unit in the block can filter out the height in three-phase series current transforming unit output voltage
Subharmonic.
6th, the pressure voltage of switching device can be reduced and by three-phase by the first coupling transformer and the second coupling transformer
Connection in series-parallel convertor circuit is isolated with power network line.
7th, dc bus voltage regulation unit is filled when distribution system does not break down by three-phase series module for energy storage device
Electricity, direct-flow storage battery do not come into operation, and when singlephase earth fault occurs for distribution system, direct current electric power storage is come into operation as three-phase simultaneously
Gang mould block inversion output zero sequence compensation electric current provides DC voltage support, and when power outage occurs for distribution system, direct current stores
Battery comes into operation plays the role of uninterruptible power supply in short-term by the inversion of parallel three phase module.
Description of the drawings
Fig. 1 is realizes power flowcontrol and the circuit block diagram of small current grounding fault active compensation extinguishing arc simultaneously.
Fig. 2 is realizes power flowcontrol and the circuit structure diagram of small current grounding fault active compensation extinguishing arc simultaneously.
Fig. 3 is realizes power flowcontrol and the circuit parallel three phase unsteady flow list of small current grounding fault active compensation extinguishing arc simultaneously
First circuit structure diagram.
Fig. 4 is realizes power flowcontrol and the circuit three-phase series unsteady flow list of small current grounding fault active compensation extinguishing arc simultaneously
First circuit structure diagram.
Fig. 5 is the circuit operation principle flow chart for realizing power flowcontrol and small current grounding fault active compensation simultaneously.
Fig. 6 controls oscillogram for distribution power flow.
Fig. 7 is does not carry out three-phase line wave simulation figure during voltage control.
Fig. 8 is three-phase line wave simulation figure after progress voltage control.
A phase alternating current oscillograms when is the non-active compensation extinguishing arc of singlephase earth fault occurs for Fig. 9.
Figure 10 is A phase alternating current oscillograms after generation singlephase earth fault active compensation extinguishing arc.
Specific embodiment
Fig. 1 ~ 10 are highly preferred embodiment of the present invention, and 1 ~ 10 the present invention will be further described below in conjunction with the accompanying drawings.
As shown in Figure 1, power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc are realized simultaneously, including first
Coupling transformer, parallel filtering unit, parallel three phase current transforming unit, dc bus voltage regulation unit, three-phase series current transforming unit, string
Join filter unit, the second coupling transformer, voltage control unit and current control unit.The primary side of first coupling transformer around
Group is connected respectively with A, B, C three-phase line of distribution system.The vice-side winding connection parallel filtering unit of first coupling transformer
One end, parallel filtering unit the other end connection parallel three phase current transforming unit exchange side, parallel three phase current transforming unit it is straight
One end of side connection dc bus voltage regulation unit is flowed, the other end connection three-phase series current transforming unit of dc bus voltage regulation unit
DC side, the exchange side of three-phase series filter unit connect the primary side winding of the second coupling transformer, the second coupling transformer
Vice-side winding is respectively connected in A, B, C three-phase line of distribution system.
Parallel three phase current transforming unit uses three phase bridge all control circuit, is opened wherein being used as using IGBT with diode inverse parallel
Device is closed, there is higher switching frequency.Convertor circuit in parallel can be operated in rectification state and inverter mode, the non-failure of power grid
When be operated in rectification state and charge for the capacitor in dc bus voltage regulation unit, stable DC bus bar side voltage and lead to
The first coupling transformer in parallel is crossed to compensate the reactive power of circuit.When in power grid occur singlephase earth fault when three-phase simultaneously
Connection current transforming unit is operated in inverter mode, and active compensation extinguishing arc is carried out to power grid injection zero-sequence current.
The gate electrode drive signals of each switching device are given by current control unit in parallel three phase current transforming unit, current control
Unit can be realized by conventional IGBT control circuits, and Current Detection Algorithm and electric current control are provided in the main control chip in it
Algorithm processed.Current Detection Algorithm refers to that main control chip is detected by the parameter to circuit secondary side, and calculates and determine to occur
The amplitude and phase of the earth current that compensate are needed during singlephase earth fault.Current Control Algorithm is according to the needs being calculated
The amplitude and phase of the earth current of compensation generate switching device in corresponding pwm signal driving parallel three phase current transforming unit
Gate pole exports the required set-point compensated.
Parallel filtering unit uses parallel three phase LC second-order filter circuits, and parallel three phase LC second-order filter circuits one end is direct
It is connect with parallel three phase current transforming unit exchange side, when parallel three phase current transforming unit is operated in rectification state, parallel filtering unit
For filtering out the higher hamonic wave of power grid inflow, when parallel three phase current transforming unit is operated in inverter mode, parallel filtering unit is used
The higher hamonic wave caused by filtering out being opened as switching device in output zero sequence compensation electric current and turning off.Parallel three phase LC second-order filters
The other end of circuit is connect with the vice-side winding of the first coupling transformer, and the use of the first coupling transformer can reduce derailing switch
Simultaneously convertor circuit in parallel is isolated with power network line for the pressure voltage of part, and former secondary uses star direct grounding way,
Channel is provided for output zero sequence compensation electric current, primary side three-phase is directly connect with A, B, C three-phase line of distribution system.
Dc bus voltage regulation unit includes double direct-flow storage batteries and double-energy storage capacitance, center line are drawn between double-energy storage capacitance
And be directly grounded, provide channel for zero-sequence current.When not breaking down, parallel three phase current transforming unit is dc bus voltage stabilizing list
Double-energy storage capacitor charging in member, storage capacitor play main DC pressure stabilization function.The direct current electric power storage when singlephase earth fault occurs
Pond has put into the function of support dc bus side voltage when carrying out active compensation to small current grounding fault, is sent out in power network line
Raw failure causes direct-flow storage battery input during circuit no-voltage to play instantaneous stand-by power supply；Dc bus regulator circuit is simultaneously
It is connect with the DC side of three-phase series current transforming unit.
Three-phase series current transforming unit equally using three phase bridge all control circuit, is equally made using IGBT and diode inverse parallel
For switching device, there is higher switching frequency.The exchange side of series AC unit and the primary side winding of the second coupling transformer
It is connected, voltage is inserted into change the amplitude of circuit output terminal voltage and phase, so as to control to power grid by the second coupling transformer
The distribution of trend processed.
The gate electrode drive signals of series connection each switching device of convertor circuit are given by voltage control unit, and voltage control unit is same
Sample can be realized by conventional IGBT control circuits, and voltage detecting algorithm and voltage control are provided in the main control chip in it
Algorithm, voltage detecting algorithm refer to that main control chip is detected by the parameter to circuit secondary side, and detection obtains power network line
The amplitude and phase of voltage.Voltage control calculates hair and refers to that main control chip determines the defeated of circuit according to line transmission power flow requirement
Go out voltage and generate corresponding pwm signal driving switch device gate pole, export required voltage value.
Series filtering unit uses three-phase series LC second-order filter circuits, and one end of three-phase series LC second-order filter circuits is straight
It connects and is connect with three-phase series current transforming unit exchange side, for filtering out the higher hamonic wave in three-phase series current transforming unit output voltage.
The other end of three-phase series LC second-order filter circuits is connect with the second coupling transformer primary side winding, and the second coupling transformer makes
It is isolated with the pressure voltage that can reduce switching device and by series connection convertor circuit with power network line, the second coupling transformer
Former vice-side winding uses star-star connection mode, neutral-point solid ground or earth-free（Depending on switching the state of K2）, the
The three-phase of the vice-side winding of two coupling transformers is sealed in respectively in A, B, C three-phase line of distribution system.
As shown in Fig. 2, transformer T2 is the first above-mentioned coupling transformer, three groups of primary side winding N1 of transformer T2 distinguish
In parallel connection access power grid A, B, C three-phase, corresponding three groups of vice-side winding N2 of transformer T2 access above-mentioned parallel filtering list
In member.The pressure voltage of switching device in parallel three phase current transforming unit is reduced by transformer T2, by parallel three phase current transforming unit
It is isolated with power grid, improves system security and stability.
Parallel filtering unit includes inductance L1 ~ L2, in capacitance C1 ~ C3, transformer T2 with the original in parallel for accessing A phase alternating currents
One end of the corresponding vice-side winding of side winding while shunt capacitance C1 and inductance L1, the other end ground connection of capacitance C1；Transformer T2
In vice-side winding corresponding with the primary side winding of access B phase alternating currents in parallel one end of shunt capacitance C2 and inductance L2 simultaneously, electricity
Hold the other end ground connection of C2；Vice-side winding corresponding with the primary side winding of access C phase alternating currents in parallel is simultaneously simultaneously in transformer T2
Join one end of capacitance C3 and inductance L3, the other end ground connection of capacitance C3, the other end of inductance L1 ~ L3 accesses above-mentioned three-phase simultaneously
In current transforming unit in parallel, by parallel filtering unit, the higher hamonic wave of power grid inflow and output active compensation electric current have been filtered out
In higher hamonic wave, and serial inductance therein influences the capacity of convertor circuit in parallel.
As shown in figure 3, parallel three phase current transforming unit includes IGBT pipe G1 ~ G6, diode D1 ~ D6, parallel three phase unsteady flow list
The exchange side of member is A, B, C three-phase line by above-mentioned inductance L1 ~ L3 distribution systems introduced respectively, and DC side is drawn directly respectively
Flow anode and cathode.The collector of parallel filtering unit DC side anode while parallel IGBT pipe G1, IGBT pipe G3, IGBT pipe G5
And the cathode of diode D1, diode D3, diode D5.The collector of IGBT pipes G1 and the anode of diode D1 are simultaneously simultaneously
Join the collector of IGBT pipes G2, the cathode of diode D2 and above-mentioned inductance L1；The collector and diode of IGBT pipes G3
The anode while the collector of parallel IGBT pipe G4, the cathode of diode D4 and above-mentioned inductance L2 of D3；The collection of IGBT pipes G5
The anode of electrode and diode D5 while the collector of parallel IGBT pipe G6, the cathode of diode D6 and above-mentioned inductance
L3.The emitter and two of parallel three phase current transforming unit DC side cathode while parallel IGBT pipe G2, IGBT pipe G4, IGBT pipe G6
Pole pipe D2, diode D4, diode D6 anode.The gate pole of IGBT pipes G1 ~ G6 simultaneously with above-mentioned current control unit（Module
U1）It is connected and realizes control.
As shown in Fig. 2, above-mentioned dc bus voltage regulation unit includes storage batteries D C1 ~ DC2, storage capacitor C7 ~ C8.Three-phase
The anode while the anode of multiple-connected battery DC1, one end of capacitance C7 and three-phase series unsteady flow of current transforming unit DC side in parallel
The anode of unit DC side, the cathode of parallel three phase current transforming unit the DC side cathode of multiple-connected battery DC2, capacitance C8 simultaneously
Cathode, the storage batteries D C2 of one end and the cathode of three-phase series current transforming unit DC side, ground terminal while multiple-connected battery DC1
Anode and capacitance C7 ~ C8 the other end.
Dc bus voltage regulation unit sets switch in the connection circuit of accumulator（It is not drawn into figure）To control accumulator
Use, when distribution system does not break down by three-phase series current transforming unit be energy storage device charge, direct-flow storage battery is not
It comes into operation.When singlephase earth fault occurs for distribution system, direct current electric power storage is come into operation as parallel three phase current transforming unit inversion
It exports zero sequence compensation electric current and DC voltage support is provided, when power outage occurs for distribution system, direct-flow storage battery input makes
Play the role of uninterruptible power supply in short-term with the inversion by parallel three phase current transforming unit.
As shown in figure 4, above-mentioned three-phase series current transforming unit includes IGBT pipes G1 ' ~ G6 ' and diode D1 ' ~ D6 '.Three
Be in series current transforming unit DC side anode while parallel IGBT pipe G1 ', IGBT pipes G3 ', the collector of IGBT pipes G5 ' and two poles
Pipe D1 ', diode D3 ', diode D5 ' cathode.The collector of IGBT pipes G1 ' and the anode of diode D1 ' are in parallel simultaneously
The C phases of the collector of IGBT pipes G2 ', the cathode of diode D2 ' and three-phase series current transforming unit are held；The current collection of IGBT pipes G3 '
The collector of parallel IGBT pipe G4 ', the cathode of diode D4 ' and three-phase series become the anode of pole and diode D3 ' simultaneously
The B phases of stream unit are held；The collector of the collector of IGBT pipes G5 ' and the anode of diode D5 ' while parallel IGBT pipe G6 ',
The cathode of diode D6 ' and the C phases of three-phase series current transforming unit are held, and the A phases of three-phase series current transforming unit are held, B phases are held and C
Phase end forms the exchange side of three-phase series current transforming unit, and exchange side is connected with above-mentioned series filtering unit.Three-phase series unsteady flow
Unit DC side cathode while parallel IGBT pipe G2 ', IGBT pipes G4 ', the emitter of IGBT pipes G6 ' and diode D2 ', two poles
The anode of pipe D4 ', diode D6 '.The gate pole of IGBT pipes G1 ' ~ G6 ' simultaneously with above-mentioned voltage control unit（Module U2）It is connected
And realize control, by the controllable voltage of voltage control unit control three-phase series current transforming unit output amplitude and phase, and lead to
It crosses series coupled transformer and is inserted into power network line the function of realizing voltage adjusting, phase shifting control and power flow control.
As shown in Fig. 2, above-mentioned series filtering unit includes capacitance C4 ~ C6, inductance L4 ~ L6.Above-mentioned three-phase series unsteady flow
The A phases of unit exchange side hold series inductance L4 later while one group of primary side winding in one end of shunt capacitance C4 and transformer T3
One end in N1 is connected on the corresponding vice-side winding of the primary side winding in power grid A phase alternating currents, another termination of capacitance C4
Ground；The B phases of three-phase series current transforming unit exchange side hold after series inductance L5 one end of shunt capacitance C5 and transformer simultaneously
One end in T3 in one group of primary side winding N1 is connected on the corresponding vice-side winding of the primary side winding in power grid B phase alternating currents,
The other end ground connection of capacitance C5；The C phases of three-phase series current transforming unit exchange side hold series inductance L6 later while shunt capacitance C6
One end and transformer T3 in one end in one group of primary side winding N1, be connected on the corresponding vice-side winding of the primary side winding
In power grid C phase alternating currents, the other end ground connection of capacitance C6.The other end of three groups of primary side windings of above-mentioned transformer T3 passes through
K2 ground connection is switched, when it is off state to switch K2, transformer T3 primary side windings are star-like direct grounding way, when switch K2 is
During on-state, transformer T3 primary side windings are star-like earth-free mode, and vice-side winding three-phase seals in power grid.
Specific work process and operation principle are as follows：
As shown in figure 5, voltage control module continuously measures the three-phase electricity of power distribution network by the mutual inductor in existing power distribution network
Pressure and residual voltage, when residual voltage is more than the 15% of phase voltage, earth fault has occurred, and by comparing three-phase voltage in judgement
Size simultaneously identifies the phase that is out of order, and parallel three phase current transforming unit is operated in inverter mode at this time, and dc bus voltage regulation unit is exported
DC inverter be converted to alternating current, and pass through the first coupling transformer and exported.Current control unit control at this time three
Be in parallel the break-make of switching device in current transforming unit, injected into power grid needed for the zero-sequence current that compensates.It is delayed after 5s, reduces
The injection of zero-sequence current, and the residual voltage in power grid is detected again, and judge the whether proportional decline of residual voltage,
Trouble point blow-out is represented if proportional decline, and is stopped continuing to inject zero-sequence current at this time, is restored power distribution network and normally transport
Row；If the not long ratio of residual voltage declines, which is continuous earth failure, carries out failure line selection and isolated fault line
Road makes distribution network restoration normal.
If not occurring earth fault in power grid, this realizes that power flowcontrol and small current grounding fault active compensation disappear simultaneously
The circuit of arc carries out power grid the main control chip and signal processing of Real-time Power Flow control, at this time circuital current, voltage control unit
Circuit is detected line voltage distribution and current signal, and the voltage value for needing to be inserted into distribution system is calculated according to target power,
Convertor circuit in parallel is operated in rectification state and charges to dc bus side storage capacitor, voltage control module control series resonant inverter electricity
Road is operated in inverter mode, exports required voltage value and realizes power flowcontrol function.
For above-mentioned circuit and side for realizing power flowcontrol and small current grounding fault active compensation extinguishing arc simultaneously of verification
The feasibility of method, builds power distribution network looped network operation with closed ring system in the SIMULINK of MATLAB and circuit model is emulated
Analysis.Power flowcontrol simulating, verifying is as follows, and to compare situation before and after power flowcontrol, circuit comes into operation in 0.15S.
As shown in fig. 6, circuit active power flowing when curve 1 and curve 2 are respectively same two outlet operation with closed ring of busbar
Situation, before not carrying out power flowcontrol, the outlet conveying active power that curve 1 represents is big, and the outlet that curve 1 represents conveys wattful power
Rate is small.In 0.15S, circuit carries out power flowcontrol to it, and the active power that two outlets convey after control is substantially change, to two
The active power flowing of outlet is adjusted.
Oscillogram is adjusted as Fig. 7 ~ 8 show voltage, wherein waveform A, B, C is respectively A, B, C three-phase corresponding voltage waveform
Figure, as shown in Figure 7, the voltage of system is fluctuated, and seriously affects the normal work of the various loads of load side, is carrying out electricity
After pressure is adjusted, the waveform of A, B, C three-phase is as shown in figure 8, line voltage distribution fluctuation is eliminated, and line voltage distribution restores normal, line electricity
Pressure fluctuation is eliminated, and line voltage distribution restores normal.
As shown in Fig. 9 ~ 10, realize that power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc have simultaneously for this
Edge compensation function verify waveform, as shown in figure 9, in 0.04S, earth fault occurs for A phases, fault waveform as shown in the figure, according to
Simulation Model parameter calculates, and determines the zero sequence compensation electric current exported needed for the three-phase of circuit as in injection three-phase line
Zero-sequence current synthesis.The synthesis of zero-sequence current can be allocated according to arbitrary combination at this time and be injected separately into three-phase line
In.To compare compensation context, in 0.15S, circuit comes into operation, after injection zero-sequence current carries out active compensation extinguishing arc
Current in the fault point waveform is as shown in Figure 10, and waveform restores normal after 0.15S.
From above-mentioned simulation result map analysis, proposed by the invention power flowcontrol and the active compensation extinguishing arc of can be achieved at the same time
Circuit structure can carry out power flowcontrol, the functions such as voltage is adjusted when not breaking down, and connect can after failure when generation is single-phase
Zero-sequence current is injected with the three opposite power distribution networks by circuit in parallel convertor circuit and carries out active compensation extinguishing arc, reduces single-phase earthing
The harm of failure.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
Imitate embodiment.But it is every without departing from technical solution of the present invention content, technical spirit according to the present invention is to above example institute
Any simple modification, equivalent variations and the remodeling made still fall within the protection domain of technical solution of the present invention.
Claims (8)
1. realize power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc simultaneously, it is characterised in that：Including：
First coupling transformer, three groups of primary side windings are connected between distribution system A, B, C three-phase line and ground terminal, the
The former secondary of one coupling transformer uses star direct grounding way；
Parallel three phase module, including exchange side and DC side, exchange side is connected respectively with the first coupling transformer vice-side winding,
For realizing the reactive-load compensation of power grid and active compensation extinguishing arc by the first coupling transformer；
Dc bus voltage regulation unit, one end are connected with the DC side of parallel three phase module, are used to implement DC voltage-stabilizing and to be defeated
Go out zero sequence compensation electric current and channel is provided；
Three-phase series module, including exchange side and DC side, DC side is connected with the other end of dc bus voltage regulation unit, uses
Change trend flowing in being inserted into voltage to distribution system by the second coupling transformer；
Second coupling transformer, primary side winding are connected between three-phase series module exchange side and ground terminal, secondary around
Group is connected on respectively in distribution system A, B, C three-phase line；
The parallel three phase module includes parallel three phase filter unit, the parallel three phase current transforming unit for filtering out higher hamonic wave
And to current control unit that parallel three phase current transforming unit is controlled；The exchange side of parallel three phase current transforming unit passes through parallel connection
Filter unit connection first coupling transformer, the dc bus that the DC side connection of parallel three phase current transforming unit is described are steady
Press unit；
The three-phase series module includes the series connection filter for filtering out higher hamonic wave in three-phase series current transforming unit output voltage
Wave unit, three-phase series current transforming unit and the voltage control unit controlled three-phase series current transforming unit；Three-phase series
The exchange side of current transforming unit connects the primary side winding of second coupling transformer, three-phase series unsteady flow by series filtering unit
Dc bus voltage regulation unit described in the DC side connection of unit.
2. it is according to claim 1 while realize power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc,
It is characterized in that：The parallel three phase current transforming unit uses three phase bridge all control circuit, including IGBT pipes G1 ~ G6 and two poles
Pipe D1 ~ D6, parallel three phase current transforming unit DC side anode connect the collector of IGBT pipe G1, IGBT pipe G3, IGBT pipes G5 simultaneously,
Parallel three phase current transforming unit DC side cathode connects the emitter of IGBT pipe G2, IGBT pipe G4, IGBT pipes G6 simultaneously；IGBT is managed
The emitter of G1, IGBT pipe G3, IGBT pipe G5 connect the collector and difference of IGBT pipe G2, IGBT pipe G4, IGBT pipes G6 respectively
The exchange side for drawing parallel three phase current transforming unit is connected with parallel filtering unit；
The cathode of diode D1 ~ D6 connects the collector of IGBT pipes G1 ~ G6 respectively, and the anode of diode D1 ~ D6 connects respectively
The emitter of IGBT pipes G1 ~ G6, the gate pole of IGBT pipes G1 ~ G6 are connected simultaneously with the current control unit.
3. it is according to claim 1 while realize power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc,
It is characterized in that：The parallel filtering unit uses the parallel three phase LC second orders being made of capacitance C1 ~ C3 and inductance L1 ~ L3
Filter circuit, three groups of vice-side windings of the first coupling transformer connect inductance L1 and capacitance C1 respectively, inductance L2 and capacitance C2 with
And one end of inductance L3 and capacitance C3, the other end ground connection of capacitance C1 ~ C3, the other end of inductance L1 ~ L3 connect three-phase simultaneously respectively
Join the exchange side of current transforming unit.
4. it is according to claim 1 while realize power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc,
It is characterized in that：The three-phase series current transforming unit uses three phase bridge all control circuit, including IGBT pipes G1 ' ~ G6 ' and two
Pole pipe D1 ' ~ D6 ', three-phase series current transforming unit DC side anodes connect IGBT pipes G1 ', IGBT pipes G3 ', IGBT pipes G5 ' simultaneously
Collector, three-phase series current transforming unit DC side cathode connect the transmitting of IGBT pipes G2 ', IGBT pipes G4 ', IGBT pipes G6 ' simultaneously
Pole, IGBT pipes G1 ', IGBT pipes G3 ', IGBT pipes G5 ' emitter connect respectively IGBT pipes G2 ', IGBT pipes G4 ', IGBT pipe
The collector of G6 ' and respectively draw three-phase series current transforming unit exchange side be connected with series filtering unit；
The cathode of diode D1 ' ~ D6 ' connects IGBT pipes G1 ' ~ G6 ' collectors respectively, and the anode of diode D1 ' ~ D6 ' connects respectively
The emitter of IGBT pipes G1 ' ~ G6 ' is connect, IGBT pipes G1 ' ~ G6 ' gate poles are connected simultaneously with the voltage control unit.
5. it is according to claim 1 while realize power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc,
It is characterized in that：The series filtering unit includes the three-phase series LC second orders being made of capacitance C4 ~ C6 and inductance L4 ~ L6
Filter circuit connects the second coupling transformer three after exchange side difference series inductance L4 ~ L6 of three-phase series current transforming unit respectively
One end of group primary side winding and one end of capacitance C4 ~ C6, the other end ground connection of capacitance C4 ~ C6, the second three groups of coupling transformer
The other end of primary side winding is by switching K2 ground connection.
6. it is according to claim 1 while realize power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc,
It is characterized in that：Double storages of support dc bus side voltage when the dc bus voltage regulation unit is included in active compensation extinguishing arc
Battery and double-energy storage element, double-energy storage element centre are drawn center line and are directly grounded, and channel is provided for output zero sequence compensation electric current.
7. it is according to claim 6 while realize power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc,
It is characterized in that：Double accumulators are storage batteries D C1 and DC2, and the double-energy storage element is storage capacitor C7 ~ C8；
The anode of parallel three phase module DC side connects the anode of storage batteries D C1, one end of capacitance C7 and three-phase series simultaneously
The anode of the DC side of module, the cathode of parallel three phase module DC side connect simultaneously the cathode of storage batteries D C2, capacitance C8 one
The cathode of the DC side of end and three-phase series module, ground terminal are connecting the cathode of storage batteries D C1, storage batteries D C2 just simultaneously
Pole and the other end of capacitance C7 ~ C8 are drawn center line and are directly grounded between capacitance C7 and C8.
8. it is according to claim 1 while realize power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc,
It is characterized in that：The former vice-side winding of second coupling transformer uses star-star connection mode, and primary side winding is using neutral
Point direct grounding way.
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| CN105515001B (en) * | 2016-01-29 | 2018-01-19 | 合肥工业大学 | A kind of probability load flow calculation method containing wind power system based on minimum error originated from input criterion |
| CN108306300B (en) * | 2018-01-30 | 2020-09-01 | 中国电力科学研究院有限公司 | Method and system for determining capacity of unified power flow controller on main network section |
| CN108448562B (en) * | 2018-05-25 | 2024-05-28 | 云南电网有限责任公司电力科学研究院 | Current full compensation method and system based on single-phase earth fault |
| CN109088410B (en) * | 2018-08-16 | 2024-04-12 | 法瑞电气(南通)有限公司 | Phase 360-degree orthogonal direct power flow controller and working method thereof |
| CN110011280B (en) * | 2019-04-18 | 2024-03-15 | 国网江苏省电力有限公司 | Series converter module with fault isolation function and power electronic transformer |
| CN110277788B (en) * | 2019-07-25 | 2023-12-12 | 国网青海省电力公司果洛供电公司 | Composite compensation device for long-distance sparse power supply |
| CN111505440B (en) * | 2020-04-27 | 2022-09-20 | 云南拓普特种电源科技有限公司 | Ground fault detection and protection system and method based on class D power amplifier |
| CN114142451B (en) * | 2021-11-19 | 2022-09-23 | 广东福德电子有限公司 | Power distribution network ground fault voltage reduction active arc suppression power supply and control method thereof |
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