CN109524977A - It is suitable for the synthesis suppressing method of the inside and outside three-phase imbalance disturbance of micro-capacitance sensor group - Google Patents
It is suitable for the synthesis suppressing method of the inside and outside three-phase imbalance disturbance of micro-capacitance sensor group Download PDFInfo
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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
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Abstract
It is suitable for the synthesis suppressing method of the inside and outside three-phase imbalance disturbance of micro-capacitance sensor group, external three-phase imbalance disturbance refers to that the grid-connected busbar voltage of micro-capacitance sensor group is slightly unbalance, the disturbance of internal three-phase imbalance refer to asymmetric load is connect on micro-capacitance sensor inter-bay, imbalance is transported to electric distributed network, further include that asymmetric load and the micro- source of imbalance etc. are connect on itself bus of internal micro-capacitance sensor.Micro-capacitance sensor inter-bay voltage three-phase is unbalance to be inhibited by combined type tandem type micro-capacitance sensor by introducing new control loop or new controller, when combined type tandem type micro-capacitance sensor failure by direct-current grid by concentrating inverter three-phase imbalance to inhibit control come anti-interference；Three-phase alternating current micro-capacitance sensor controls to resist unbalance disturbance by internal power storage unit current transformer.Uneven mutual interference is blocked by route active controllable reactor between external disturbance and micro-capacitance sensor.The synthesis suppressing method in turn ensures the power quality of each stage load while improving clean energy resource digestion capability.
Description
Technical field
The present invention relates to the synthesis suppression technologies of the inside and outside three-phase imbalance of micro-capacitance sensor group disturbance, are based particularly on combination
Formula three-phase series type micro-capacitance sensor series resonant inverter link or direct-current grid concentrate inverter three-phase imbalance to inhibit control, micro-capacitance sensor
Internal power storage unit gird-connected inverter inhibits control, route active controllable reactor to block the multiple of the unbalance mutual interference of three-phase imbalance
Integrated control method.
Background technique
Micro-capacitance sensor group is a kind of novel electric power network with high proportion high permeability renewable energy.It is by multiple micro- electricity
Netcom realizes that energy mutually helps regulation after crossing interconnector interconnection, and the reliability that internal micro-capacitance sensor is powered thus not only can be improved,
Clean energy resource permeability can also be further increased, is more importantly that multiple micro-capacitance sensors are run in a manner of group variety and can be greatly reduced
Passive power distribution network directly manages, controls the information content of distributed generation resource.Micro-capacitance sensor group is extensive clean energy resource under existing situation
The important tool and technology of the clean energy resourcies such as exploitation and consumption wind, light.
In micro-capacitance sensor group's actual moving process, micro-capacitance sensor inter-bay can be internal by connect micro-capacitance sensor, group's stage load etc.
Brought three-phase imbalance interference, while connect distributed generation unit on three-phase alternating current micro-capacitance sensor internal bus, load
It is unbalance to will lead to micro-capacitance sensor bus three-phase.Increasingly complex problem is female inside micro-capacitance sensor inter-bay and three-phase alternating current micro-capacitance sensor
The unbalance of line voltage can generate mutual interference effect, these are all that micro-capacitance sensor group operation brings the unbalance disturbance of internal three-phase.In addition, external
Power distribution network is slightly unbalance also to bring external three-phase imbalance disturbing influence to micro-capacitance sensor group.Inside and outside disturbing influence seriously threatens
The Electrical Safety of each stage load and the safe and stable operation of system.
Summary of the invention
It is an object of the present invention to provide a kind of comprehensive inhibition sides of inside and outside three-phase imbalance disturbance for being suitable for micro-capacitance sensor group
Method.
The present invention is the synthesis suppressing method for being suitable for the inside and outside three-phase imbalance disturbance of micro-capacitance sensor group, micro-capacitance sensor group system
System is by three-phase alternating current micro-capacitance sensor 1, Combined three phase tandem type micro-capacitance sensor 2, direct-current grid 3, single phase ac micro-capacitance sensor 4, first
The grid-connected switch 7 of grid-connected switch 5, the second grid-connected switch 6, third, the 4th grid-connected switch 8, the 5th grid-connected switch 9, grid-connected transformer
T1, grid-connected transformer T2, grid-connected transformer T3, grid-connected transformer T4, grid-connected transformer T5, the contact of the first interconnection 10, second
Line 11, third interconnection 12, the 4th interconnection 13, the 5th interconnection 14, micro-capacitance sensor inter-bay 15, power distribution network bus 16, mutually
Join sensibility load 17 and general load 18 on bus to form, three-phase alternating current micro-capacitance sensor 1, the micro- electricity of Combined three phase tandem type
Net 2, direct-current grid 3, single phase ac micro-capacitance sensor 4 and entire micro-capacitance sensor group system are incorporated into the power networks or off-grid operation, three-phase
Exchange micro-capacitance sensor 1, Combined three phase tandem type micro-capacitance sensor 2, direct-current grid 3, single phase ac micro-capacitance sensor 4 and entire micro-capacitance sensor
It is all connected to load on group's internal system bus, and three-phase alternating current micro-capacitance sensor 1, Combined three phase tandem type micro-capacitance sensor 2, direct current are micro-
Energy-storage units are all connected on power grid 3,4 internal bus of single phase ac micro-capacitance sensor, the inside and outside three-phase imbalance disturbs synthesis
Suppressing method includes the following steps:
Step 1: series connection accesses the first active controllable reactor 19, in micro-capacitance sensor group on 1 interconnection circuit of three-phase alternating current micro-capacitance sensor
The second active controllable reactor 20 of series connection access on grid-connected line, to energy-storage units gird-connected inverter in three-phase alternating current micro-capacitance sensor 1,
Lead in the concentration inverter control loop of series resonant inverter link and direct-current grid 3 in Combined three phase tandem type micro-capacitance sensor 2
Software switch is crossed to introduce new loop or new controller, new loop or new controller is used to export electricity to respective inverter
It is pressed with preferable three-phase imbalance rejection ability, it is female that the sensitive load 17 of imbalance of three-phase voltage disturbance is connected to micro-capacitance sensor interconnection
On line 15；
Step 2: in system operation, 1 internal bus voltage tri-phase unbalance factor ε of real-time monitoring three-phase alternating current micro-capacitance sensorumg1,
Degree of unbalancedness εumg1Shown in calculation method such as formula (1):
U in formula (1)mg11For three-phase alternating current micro-capacitance sensor (1) internal bus voltage fundamental positive-sequence component, Umg12It is micro- for three-phase alternating current
1 internal bus voltage fundamental negative sequence component of power grid, as degree of unbalancedness εumg1Greater than its threshold valueWhen, opening software switch makes three
Mutually energy-storage units gird-connected inverter inhibits the new loop of three-phase imbalance or new controller to put into operation in exchange micro-capacitance sensor 1, it
After continue monitor 1 internal bus voltage tri-phase unbalance factor ε of three-phase alternating current micro-capacitance sensorumg1；
Step 3: real-time monitoring micro-capacitance sensor inter-bay (15) voltage tri-phase unbalance factor εuec, degree of unbalancedness εuecCalculation method is such as
Shown in formula (2):
U in formula (2)ec1For 15 voltage fundamental negative sequence component of micro-capacitance sensor inter-bay, Uec2For 15 voltage of micro-capacitance sensor inter-bay
Fundamental wave negative sequence component, as degree of unbalancedness εuecLess than its threshold valueWhen, without carrying out operation bidirectional, otherwise judge Combined three phase
Whether tandem type micro-capacitance sensor 2 makes to combine in malfunction when Combined three phase tandem type micro-capacitance sensor 2 is in normal condition
Series resonant inverter link inhibits the new loop of three-phase imbalance or new controller to put into operation in formula three-phase series type micro-capacitance sensor 2, when
When Combined three phase tandem type micro-capacitance sensor 2 is in malfunction, opens in direct-current grid 3 and concentrate the inhibition three-phase of inverter not
The new loop or new controller of balance, and the 4th grid-connected switch 8 of disconnection makes 4 independent operating of single phase ac micro-capacitance sensor, hereafter continues
Judge εuecWithSize relation, whenWhen, continue to keep real-time monitoring degree of unbalancedness εuec, under otherwise entering
One step；
Step 4: the degree of unbalancedness ε of electric current on the first interconnection 10 of detectionimg1, shown in calculation method such as formula (3),
I in formula (3)mg11For fundamental positive sequence, the I for flowing through 10 electric current of the first interconnectionmg12To flow through the first interconnection 10
The fundamental wave negative sequence component of electric current, as current unbalance factor εimg1Greater than its threshold valueWhen, according to principle shown in formula (4), adjustment
Connect the 19 impedance value Z of the first active controllable reactor of access on 1 first interconnection 10 of three-phase alternating current micro-capacitance sensorAXmg1,
ZAXmg1=Z1mg1+(1-mmg1)Zmg1 (4)
Z in formula (4)1mg1For the leakage impedance of transformer first siding ring in the first active controllable reactor 19, Zmg1Have for first
Excitation Impedance of Power Transformer in source controlled reactor 19, mmg1For regulated variable, if mmg1Adjusting causes impedance value ZAXmg1Resistance sense,
Capacitance-resistance changing features and can be realized εumg1It is less thanWhen, without other operations, continue to monitor εumg1, otherwise, disconnect
First grid-connected switch 5 makes 1 independent operating of three-phase alternating current micro-capacitance sensor, and enters next step；
Step 5: the current unbalance factor ε of detection the 5th interconnection 14 of micro-capacitance sensor groupig, shown in calculation method such as formula (5),
I in formula (1)g1For fundamental positive sequence, the I for flowing through 14 electric current of the 5th interconnectiong2To flow through 14 electric current of the 5th interconnection
Fundamental wave negative sequence component, work as current unbalance factorWhen, it adjusts and connects the second of access on micro-capacitance sensor group system grid connection line
20 impedance value Z of active controllable reactorAXg,
ZAXg=Z1g+(1-mg)Zmg (6)
Z in formula (6)1gFor the leakage impedance of transformer first siding ring in the second active controllable reactor 20, ZmgIt is active for second
Excitation Impedance of Power Transformer in controlled reactor 20, mgFor regulated variable, if mgAdjusting causes impedance value ZAXgIn resistance sense, capacitance-resistance
Changing features and can be realized εumg1It is less thanWhen, without other operations, continue to monitor εumg1, otherwise, judge 5-linked
Current direction on winding thread 14, when electric current flows to power distribution network bus 16 by micro-capacitance sensor inter-bay 15, disconnection the 5th is grid-connected to be opened
Closing 9 makes microgrid group be in regional autonomy operating status, flows when electric current flows to micro-capacitance sensor inter-bay 15 by power distribution network bus 16
When, according to load important level, the part single-phase load in general load 18 is cut off step by step, until εumg1Less than ε *umg1。
Usefulness of the present invention is: the strategy can be protected again while improving micro-capacitance sensor group to clean energy resource digestion capability
The power quality of each stage load is demonstrate,proved, this is all attributed to the fact that invented comprehensive inhibition strategy can resist or eliminate simultaneously inside and outside three
Mutually unbalance disturbance, external three-phase imbalance disturbance refer to that the grid-connected busbar voltage of micro-capacitance sensor group is slightly unbalance, and internal three-phase imbalance is disturbed
It is dynamic refer to connect asymmetric load on micro-capacitance sensor inter-bay, imbalance is transported to electric distributed network, further include internal micro-capacitance sensor oneself
Asymmetric load and uneven micro- source etc. are connect on body bus.Micro-capacitance sensor inter-bay voltage three-phase is unbalance by combined type tandem type
Micro-capacitance sensor is inhibited by introducing new control loop or new controller, as combined type tandem type micro-capacitance sensor failure Shi Youzhi
Micro-capacitance sensor is flowed by concentrating inverter three-phase imbalance to inhibit control come anti-interference；Three-phase alternating current micro-capacitance sensor passes through internal power storage unit
Current transformer controls to resist unbalance disturbance.Between external disturbance and micro-capacitance sensor uneven mutual interference by route active controllable reactor into
Row blocks.
Detailed description of the invention
Fig. 1 be include three-phase alternating current micro-capacitance sensor, Combined three phase tandem type micro-capacitance sensor, direct-current grid and blow-up
Micro-capacitance sensor group's system construction drawing of micro-capacitance sensor is flowed, Fig. 2 is Combined three phase tandem type micro-capacitance sensor structure chart, and Fig. 3 is combined type three
The type that is connected in series micro-capacitance sensor series resonant inverter Absent measures block diagram, Fig. 4 are active controllable reactor figures, and Fig. 5 is active controllable electricity
Anti- device equivalent impedance simplification figure.
Specific embodiment
As shown in Figure 1, the micro-capacitance sensor and group's stage load that meet heterogeneous feature containing 4 inside micro-capacitance sensor group, 4 non-equal
Matter micro-capacitance sensor is three-phase alternating current micro-capacitance sensor (1), Combined three phase tandem type micro-capacitance sensor 2, direct-current grid 3, single phase ac respectively
Energy-storage units are configured with inside 4,4 micro-capacitance sensors of micro-capacitance sensor, all there is off-network stand-alone capability, under normal conditions multiple micro- electricity
Net is run in a manner of group variety.Combined three phase tandem type micro-capacitance sensor 2 is as shown in Fig. 2, using star-like combination, and neutral point is outstanding
It is floating.
The control of Combined three phase tandem type micro-capacitance sensor series resonant inverter link three-phase imbalance is female to inhibit to interconnect in the present invention
The internal disturbance of line influences, as shown in figure 3, realizing that grid-connected current fundamental wave is born by series resonant inverter link under micro-capacitance sensor group's grid-connect mode
Order components, harmonic component, the compensation between reactive current, and penalty coefficient can be passed through and realize that the coordination between multiple functions is mended
It repays；Under independent operation mode, series resonant inverter link supports the voltage of microgrid group interbus using Double closed-loop of voltage and current
With frequency, uneven nonlinear load requirement can be met using MQPR controller, inhibit three-phase uneven using split-phase independent control
Weighing apparatus disturbance.Current inner loop reference value is switched over by target selection switch under two kinds of operational modes, to output in control process
Electric current has carried out feedforward to improve the tracking ability of load current.
Combined three phase tandem type micro-capacitance sensor support interbus electricity can be utilized in micro-capacitance sensor group's regionality independent operating
Pressure and frequency, and guarantee orphan/and switch the smooth transition of transient state.Direct-current grid (3) is stopped transport in tandem type micro-capacitance sensor failure
When can be by concentrating the three-phase imbalance of inverter that control is inhibited to solve inter-bay three-phase unbalance, it is also possible to support
The voltage and frequency of independent micro-capacitance sensor group.By the way that series active can in micro-capacitance sensor interconnector and in the grid-connected link of micro-capacitance sensor group
It controls reactor and blocks the external uneven disturbance from power distribution network and the mutual interference between micro-capacitance sensor bus and inter-bay, have
Source controlled reactor structure chart is as shown in figure 4, transformer primary side can be presented in the line under inverter control effect in Fig. 4
Perception, resistance sense, capacitive, capacitance-resistance out, 0 features such as resistive, active controllable reactor be equivalent in the line one it is variable
Reactance, as shown in Figure 5.
Micro-capacitance sensor group system involved in strategy is inhibited to be connected in the present invention by three-phase alternating current micro-capacitance sensor 1, Combined three phase
Type micro-capacitance sensor 2, direct-current grid 3, single phase ac micro-capacitance sensor 4, the first grid-connected switch 5, the second grid-connected switch 6, third is grid-connected opens
Close the 7, the 4th grid-connected switch 8, the 5th grid-connected switch 9, grid-connected transformer T1, grid-connected transformer T2, grid-connected transformer T3, grid-connected change
Depressor T4, grid-connected transformer T5, the first interconnection 10, the second interconnection 11, third interconnection 12, the 4th interconnection the 13, the 5th
Interconnection 14, micro-capacitance sensor inter-bay 15, power distribution network bus 16, sensibility load 17 and general load 18 on inter-bay
Composition, three-phase alternating current micro-capacitance sensor 1, Combined three phase tandem type micro-capacitance sensor 2, direct-current grid 3, single phase ac micro-capacitance sensor 4 and
Entire micro-capacitance sensor group system is incorporated into the power networks or off-grid operation, three-phase alternating current micro-capacitance sensor 1, Combined three phase tandem type micro-capacitance sensor
2, load, Er Qiesan are all connected on direct-current grid 3, single phase ac micro-capacitance sensor 4 and entire micro-capacitance sensor group's internal system bus
Mutually exchange micro-capacitance sensor 1, Combined three phase tandem type micro-capacitance sensor 2, direct-current grid 3, on 4 internal bus of single phase ac micro-capacitance sensor all
Energy-storage units are connected to, the inside and outside three-phase imbalance disturbs comprehensive suppressing method and includes the following steps:
Step 1: series connection accesses the first active controllable reactor 19, in micro-capacitance sensor group on 1 interconnection circuit of three-phase alternating current micro-capacitance sensor
The second active controllable reactor 20 of series connection access on grid-connected line, to energy-storage units gird-connected inverter in three-phase alternating current micro-capacitance sensor 1,
Lead in the concentration inverter control loop of series resonant inverter link and direct-current grid 3 in Combined three phase tandem type micro-capacitance sensor 2
Software switch is crossed to introduce new loop or new controller, new loop or new controller is used to export electricity to respective inverter
It is pressed with preferable three-phase imbalance rejection ability, it is female that the sensitive load 17 of imbalance of three-phase voltage disturbance is connected to micro-capacitance sensor interconnection
On line 15；
Step 2: in system operation, 1 internal bus voltage tri-phase unbalance factor ε of real-time monitoring three-phase alternating current micro-capacitance sensorumg1,
Degree of unbalancedness εumg1Shown in calculation method such as formula (1):
U in formula (1)mg11For 1 internal bus voltage fundamental positive-sequence component of three-phase alternating current micro-capacitance sensor, Umg12For the micro- electricity of three-phase alternating current
1 internal bus voltage fundamental negative sequence component of net, as degree of unbalancedness εumg1Greater than its threshold valueWhen, opening software switch makes three-phase
Energy-storage units gird-connected inverter inhibits the new loop of three-phase imbalance or new controller to put into operation in exchange micro-capacitance sensor 1, later
Continue to monitor 1 internal bus voltage tri-phase unbalance factor ε of three-phase alternating current micro-capacitance sensorumg1；
Step 3: 15 voltage tri-phase unbalance factor ε of real-time monitoring micro-capacitance sensor inter-bayuec, degree of unbalancedness εuecCalculation method is such as public
Shown in formula (2):
U in formula (2)ec1For 15 voltage fundamental negative sequence component of micro-capacitance sensor inter-bay, Uec2For 15 voltage of micro-capacitance sensor inter-bay
Fundamental wave negative sequence component, as degree of unbalancedness εuecLess than its threshold valueWhen, without carrying out operation bidirectional, otherwise judge Combined three phase
Whether tandem type micro-capacitance sensor 2 makes to combine in malfunction when Combined three phase tandem type micro-capacitance sensor 2 is in normal condition
Series resonant inverter link inhibits the new loop of three-phase imbalance or new controller to put into operation in formula three-phase series type micro-capacitance sensor 2, when
When Combined three phase tandem type micro-capacitance sensor 2 is in malfunction, opens in direct-current grid 3 and concentrate the inhibition three-phase of inverter not
The new loop or new controller of balance, and the 4th grid-connected switch 8 of disconnection makes 4 independent operating of single phase ac micro-capacitance sensor, hereafter continues
Judge εuecWithSize relation, whenWhen, continue to keep real-time monitoring degree of unbalancedness εuec, under otherwise entering
One step；
Step 4: the degree of unbalancedness ε of electric current on the first interconnection 10 of detectionimg1, shown in calculation method such as formula (3),
I in formula (3)mg11For fundamental positive sequence, the I for flowing through 10 electric current of the first interconnectionmg12To flow through the first interconnection 10
The fundamental wave negative sequence component of electric current, as current unbalance factor εimg1Greater than its threshold valueWhen, according to principle shown in formula (4), adjustment
Connect the 19 impedance value Z of the first active controllable reactor of access on 1 first interconnection 10 of three-phase alternating current micro-capacitance sensorAXmg1,
ZAXmg1=Z1mg1+(1-mmg1)Zmg1
Z in formula (4)1mg1For the leakage impedance of transformer first siding ring in the first active controllable reactor 19, Zmg1Have for first
Excitation Impedance of Power Transformer in source controlled reactor 19, mmg1For regulated variable, if mmg1Adjusting causes impedance value ZAXmg1Resistance sense,
Capacitance-resistance changing features and can be realized εumg1It is less thanWhen, without other operations, continue to monitor εumg1, otherwise, disconnect
First grid-connected switch 5 makes 1 independent operating of three-phase alternating current micro-capacitance sensor, and enters next step；
Step 5: the current unbalance factor ε of detection the 5th interconnection 14 of micro-capacitance sensor groupig, shown in calculation method such as formula (5),
I in formula (1)g1For fundamental positive sequence, the I for flowing through 14 electric current of the 5th interconnectiong2To flow through 14 electric current of the 5th interconnection
Fundamental wave negative sequence component, work as current unbalance factorWhen, it adjusts and connects the second of access on micro-capacitance sensor group system grid connection line
20 impedance value Z of active controllable reactorAXg,
ZAXg=Z1g+(1-mg)Zmg
Z in formula (6)1gFor the leakage impedance of transformer first siding ring in the second active controllable reactor 20, ZmgIt is active for second
Excitation Impedance of Power Transformer in controlled reactor 20, mgFor regulated variable, if mgAdjusting causes impedance value ZAXgIn resistance sense, capacitance-resistance
Changing features and can be realized εumg1It is less thanWhen, without other operations, continue to monitor εumg1, otherwise, judge 5-linked
Current direction on winding thread 14, when electric current flows to power distribution network bus 16 by micro-capacitance sensor inter-bay 15, disconnection the 5th is grid-connected to be opened
Closing 9 makes microgrid group be in regional autonomy operating status, flows when electric current flows to micro-capacitance sensor inter-bay 15 by power distribution network bus 16
When, according to load important level, the part single-phase load in general load 18 is cut off step by step, until εumg1It is less thanSpecifically
Implementation steps are as follows:
Step 1: series connection accesses the first active controllable reactor 19, in micro-capacitance sensor group on 1 interconnection circuit of three-phase alternating current micro-capacitance sensor
The second active controllable reactor 20 of series connection access on grid-connected line, to energy-storage units gird-connected inverter in three-phase alternating current micro-capacitance sensor 1,
Lead in the concentration inverter control loop of series resonant inverter link and direct-current grid 3 in Combined three phase tandem type micro-capacitance sensor 2
Software switch is crossed to introduce new loop or new controller, new loop or new controller is used to export electricity to respective inverter
It is pressed with preferable three-phase imbalance rejection ability, it is female that the sensitive load 17 of imbalance of three-phase voltage disturbance is connected to micro-capacitance sensor interconnection
On line 15；
Step 2: in system operation, 1 internal bus voltage tri-phase unbalance factor ε of real-time monitoring three-phase alternating current micro-capacitance sensorumg1,
Degree of unbalancedness εumg1Shown in calculation method such as formula (1):
U in formula (1)mg11For 1 internal bus voltage fundamental positive-sequence component of three-phase alternating current micro-capacitance sensor, Umg12For the micro- electricity of three-phase alternating current
1 internal bus voltage fundamental negative sequence component of net, as degree of unbalancedness εumg1Greater than its threshold valueWhen, opening software switch makes three-phase
Energy-storage units gird-connected inverter inhibits the new loop of three-phase imbalance or new controller to put into operation in exchange micro-capacitance sensor 1, later
Continue to monitor 1 internal bus voltage tri-phase unbalance factor ε of three-phase alternating current micro-capacitance sensorumg1；
Step 3: 15 voltage tri-phase unbalance factor ε of real-time monitoring micro-capacitance sensor inter-bayuec, degree of unbalancedness εuecCalculation method is such as public
Shown in formula (2):
U in formula (2)ec1For 15 voltage fundamental negative sequence component of micro-capacitance sensor inter-bay, Uec2For 15 voltage of micro-capacitance sensor inter-bay
Fundamental wave negative sequence component, as degree of unbalancedness εuecLess than its threshold valueWhen, without carrying out operation bidirectional, otherwise judge Combined three phase
Whether tandem type micro-capacitance sensor 2 makes to combine in malfunction when Combined three phase tandem type micro-capacitance sensor 2 is in normal condition
Series resonant inverter link inhibits the new loop of three-phase imbalance or new controller to put into operation in formula three-phase series type micro-capacitance sensor 2, when
When Combined three phase tandem type micro-capacitance sensor 2 is in malfunction, opens in direct-current grid 3 and concentrate the inhibition three-phase of inverter not
The new loop or new controller of balance, and the 4th grid-connected switch 8 of disconnection makes 4 independent operating of single phase ac micro-capacitance sensor, hereafter continues
Judge εuecWithSize relation, whenWhen, continue to keep real-time monitoring degree of unbalancedness εuec, under otherwise entering
One step；
Step 4: the degree of unbalancedness ε of electric current on the first interconnection 10 of detectionimg1, shown in calculation method such as formula (3),
I in formula (3)mg11For fundamental positive sequence, the I for flowing through 10 electric current of the first interconnectionmg12To flow through the first interconnection 10
The fundamental wave negative sequence component of electric current, as current unbalance factor εimg1Greater than its threshold valueWhen, according to principle shown in formula (4), adjustment
Connect the 19 impedance value Z of the first active controllable reactor of access on 1 first interconnection 10 of three-phase alternating current micro-capacitance sensorAXmg1,
ZAXmg1=Z1mg1+(1-mmg1)Zmg1
Z in formula (4)1mg1For the leakage impedance of transformer first siding ring in the first active controllable reactor 19, Zmg1Have for first
Excitation Impedance of Power Transformer in source controlled reactor 19, mmg1For regulated variable, if mmg1Adjusting causes impedance value ZAXmg1Resistance sense,
Capacitance-resistance changing features and can be realized εumg1It is less thanWhen, without other operations, continue to monitor εumg1, otherwise, disconnect
First grid-connected switch 5 makes 1 independent operating of three-phase alternating current micro-capacitance sensor, and enters next step；
Step 5: the current unbalance factor ε of detection the 5th interconnection 14 of micro-capacitance sensor groupig, shown in calculation method such as formula (5),
I in formula (1)g1For fundamental positive sequence, the I for flowing through 14 electric current of the 5th interconnectiong2To flow through 14 electric current of the 5th interconnection
Fundamental wave negative sequence component, work as current unbalance factorWhen, it adjusts and connects the second of access on micro-capacitance sensor group system grid connection line
20 impedance value Z of active controllable reactorAXg,
ZAXg=Z1g+(1-mg)Zmg
Z in formula (6)1gFor the leakage impedance of transformer first siding ring in the second active controllable reactor 20, ZmgIt is active for second
Excitation Impedance of Power Transformer in controlled reactor 20, mgFor regulated variable, if mgAdjusting causes impedance value ZAXgIn resistance sense, capacitance-resistance
Changing features and can be realized εumg1It is less thanWhen, without other operations, continue to monitor εumg1, otherwise, judge 5-linked
Current direction on winding thread 14, when electric current flows to power distribution network bus 16 by micro-capacitance sensor inter-bay 15, disconnection the 5th is grid-connected to be opened
Closing 9 makes microgrid group be in regional autonomy operating status, flows when electric current flows to micro-capacitance sensor inter-bay 15 by power distribution network bus 16
When, according to load important level, the part single-phase load in general load 18 is cut off step by step, until εumg1It is less than
It can be integrated by above step and guarantee micro-capacitance sensor group when by inside and outside three-phase imbalance disturbing influence, micro-capacitance sensor interconnection is female
Line, micro-capacitance sensor internal communication busbar voltage tri-phase unbalance factor can maintain within specified value.
It is one of implementation method of the invention above, for general technology person in the art, is not spending creation
Property labour in the case where, a variety of variations can be carried out to above-described embodiment, equally can be realized the purpose of the present invention.But it is very bright
Aobvious, this variation should be included in the protection scope of claims of the present invention.
Claims (1)
1. being suitable for the synthesis suppressing method of the inside and outside three-phase imbalance disturbance of micro-capacitance sensor group, it is characterised in that micro-capacitance sensor group system
System is by three-phase alternating current micro-capacitance sensor (1), Combined three phase tandem type micro-capacitance sensor (2), direct-current grid (3), single phase ac micro-capacitance sensor
(4), the first grid-connected switch (5), the second grid-connected switch (6), the grid-connected switch (7) of third, the 4th grid-connected switch (8), the 5th grid-connected
Switch (9), grid-connected transformer T1, grid-connected transformer T2, grid-connected transformer T3, grid-connected transformer T4, grid-connected transformer T5, first
Interconnection (10), the second interconnection (11), third interconnection (12), the 4th interconnection (13), the 5th interconnection (14), micro-capacitance sensor
Inter-bay (15), power distribution network bus (16), sensibility load (17) and general load (18) form on inter-bay, and three
Mutually exchange micro-capacitance sensor (1), Combined three phase tandem type micro-capacitance sensor (2), direct-current grid (3), single phase ac micro-capacitance sensor (4) and
Entire micro-capacitance sensor group system is incorporated into the power networks or off-grid operation, three-phase alternating current micro-capacitance sensor (1), the micro- electricity of Combined three phase tandem type
It is all connected on net (2), direct-current grid (3), single phase ac micro-capacitance sensor (4) and entire micro-capacitance sensor group's internal system bus negative
Lotus, and three-phase alternating current micro-capacitance sensor (1), Combined three phase tandem type micro-capacitance sensor (2), direct-current grid (3), the micro- electricity of single phase ac
Energy-storage units are all connected on net (4) internal bus, it includes following that the inside and outside three-phase imbalance, which disturbs comprehensive suppressing method,
Step:
Step 1: series connection accesses the first active controllable reactor (19), in micro- electricity on three-phase alternating current micro-capacitance sensor (1) interconnection circuit
The second active controllable reactor (20) of series connection access on the grid-connected line of group is netted, simultaneously to energy-storage units in three-phase alternating current micro-capacitance sensor (1)
The concentration inverter of series resonant inverter link and direct-current grid (3) in net inverter, Combined three phase tandem type micro-capacitance sensor (2)
New loop is introduced by software switch in control loop or uses new controller, new loop or new controller are to respective
Inverter output voltage has preferable three-phase imbalance rejection ability, and the sensitive load (17) of imbalance of three-phase voltage disturbance is connect
To on micro-capacitance sensor inter-bay (15)；
Step 2: in system operation, real-time monitoring three-phase alternating current micro-capacitance sensor (1) internal bus voltage tri-phase unbalance factor
εumg1, degree of unbalancedness εumg1Shown in calculation method such as formula (1):
U in formula (1)mg11For three-phase alternating current micro-capacitance sensor (1) internal bus voltage fundamental positive-sequence component, Umg12It is micro- for three-phase alternating current
Power grid (1) internal bus voltage fundamental negative sequence component, as degree of unbalancedness εumg1Greater than its threshold valueWhen, opening software switch makes
Energy-storage units gird-connected inverter inhibits the new loop or new controller investment fortune of three-phase imbalance in three-phase alternating current micro-capacitance sensor (1)
Row continues to monitor three-phase alternating current micro-capacitance sensor (1) internal bus voltage tri-phase unbalance factor ε laterumg1；
Step 3: real-time monitoring micro-capacitance sensor inter-bay (15) voltage tri-phase unbalance factor εuec, degree of unbalancedness εuecCalculation method is such as
Shown in formula (2):
U in formula (2)ec1For micro-capacitance sensor inter-bay (15) voltage fundamental negative sequence component, Uec2For micro-capacitance sensor inter-bay (15)
Voltage fundamental negative sequence component, as degree of unbalancedness εuecLess than its threshold valueWhen, without carrying out operation bidirectional, otherwise judge combined type
Whether three-phase series type micro-capacitance sensor (2) is in malfunction, when Combined three phase tandem type micro-capacitance sensor (2) is in normal condition
When, make the new loop or new controller of series resonant inverter link inhibition three-phase imbalance in Combined three phase tandem type micro-capacitance sensor (2)
It puts into operation, when Combined three phase tandem type micro-capacitance sensor (2) is in malfunction, it is inverse to open concentration in direct-current grid (3)
Become the new loop or new controller of the inhibition three-phase imbalance of device, and disconnect the 4th grid-connected switch (8) to make single phase ac micro-capacitance sensor
(4) hereafter independent operating continues to judge εuecWithSize relation, whenWhen, continue to keep real-time monitoring uneven
Spend εuec, otherwise enter next step；
Step 4: the degree of unbalancedness ε of electric current in detection the first interconnection (10)img1, shown in calculation method such as formula (3),
I in formula (3)mg11For fundamental positive sequence, the I for flowing through the first interconnection (10) electric currentmg12To flow through the first interconnection
(10) the fundamental wave negative sequence component of electric current, as current unbalance factor εimg1Greater than its threshold valueWhen, according to principle shown in formula (4),
Adjust first active controllable reactor (19) impedance value for access of connecting on (1) first interconnection (10) of three-phase alternating current micro-capacitance sensor
ZAXmg1,
ZAXmg1=Z1mg1+(1-mmg1)Zmg1 (4)
Z in formula (4)1mg1For the leakage impedance of transformer first siding ring in the first active controllable reactor (19), Zmg1It is first
Excitation Impedance of Power Transformer in active controllable reactor (19), mmg1For regulated variable, if mmg1Adjusting causes impedance value ZAXmg1It is hindering
Perception, capacitance-resistance changing features and can be realized εumg1It is less thanWhen, without other operations, continue to monitor εumg1, no
Then, disconnecting the first grid-connected switch (5) makes three-phase alternating current micro-capacitance sensor (1) independent operating, and enters next step；
Step 5: the current unbalance factor ε of detection the 5th interconnection (14) of micro-capacitance sensor groupig, shown in calculation method such as formula (5),
I in formula (1)g1For fundamental positive sequence, the I for flowing through the 5th interconnection (14) electric currentg2To flow through the 5th interconnection (14)
The fundamental wave negative sequence component of electric current, works as current unbalance factorWhen, adjust series connection access on micro-capacitance sensor group system grid connection line
Second active controllable reactor (20) impedance value ZAXg,
ZAXg=Z1g+(1-mg)Zmg (6)
Z in formula (6)1gFor the leakage impedance of transformer first siding ring in the second active controllable reactor (20), ZmgHave for second
Excitation Impedance of Power Transformer in source controlled reactor (20), mgFor regulated variable, if mgAdjusting causes impedance value ZAXgIn resistance sense, resistance
Capacitive changing features and can be realized εumg1It is less thanWhen, without other operations, continue to monitor εumg1, otherwise, judge
Current direction on five interconnections (14) is disconnected when electric current flows to power distribution network bus (16) by micro-capacitance sensor inter-bay (15)
5th grid-connected switch (9) makes microgrid group be in regional autonomy operating status, when electric current flows to micro-capacitance sensor by power distribution network bus (16)
When inter-bay (15) flows, according to load important level, the part single-phase load in general load (18) is cut off step by step, directly
To εumg1It is less than
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