CN110022081A - A kind of distributed inverter and its dq transformation Static Decoupling Control method with route selection function - Google Patents
A kind of distributed inverter and its dq transformation Static Decoupling Control method with route selection function Download PDFInfo
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- CN110022081A CN110022081A CN201910345193.7A CN201910345193A CN110022081A CN 110022081 A CN110022081 A CN 110022081A CN 201910345193 A CN201910345193 A CN 201910345193A CN 110022081 A CN110022081 A CN 110022081A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- Engineering & Computer Science (AREA)
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- General Physics & Mathematics (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to a kind of, and distributed inverter and its dq with route selection function convert Static Decoupling Control method, wherein the distributed inverter power supply device with route selection function.The device not only can be by distributed generation resource energy conversion to network system, while can also be selected on earth wire road when singlephase earth fault occurs for isolated neutral system.A kind of dq transformation Static Decoupling Control method with route selection function proposed for the structure not only contributes to the anti-interference ability of raising system, while can also fast and accurately select faulty line.
Description
Technical field
The present invention relates to relay protection and power electronics field, especially a kind of distributed inversion with route selection function
Power supply and its dq convert Static Decoupling Control method.
Background technique
For isolated neutral system, when singlephase earth fault occurs for route, since fault current is small and system line
Voltage still maintains symmetrically, so can be continued to run when isolated neutral system singlephase earth fault 1~2 hour, but at this time can be
Fault point generates the problems such as arc light and resonance overvoltage.So we need to find out as early as possible ground path and be cut off.Currently,
China is by one line selection apparatus of installing come route selection.Its principle is the size and power current of each route zero-sequence current amplitude of comparison
Variable quantity come while the comprehensive criterion principle that judges selects faulty line.This method route selection accuracy rate is low and is run by system
The influence of mode.As distributed inverter constantly accesses ungrounded electric net work system, function is by distributed generation resource energy
Alternating current needed for being changed into power grid, it is functionally relatively simple.Route selection and inversion function are by two different electric power respectively
Equipment is realized, virtually increases cost of investment.
Prior art disadvantage is as follows:
(1) it has a single function.When singlephase earth fault occurs for route in isolated neutral system, route selection function is by list
Only line selection apparatus is completed.Meanwhile the effect of distributed inverter power supply device is only by distributed generation resource energy conversion to power grid
System.So they are functionally relatively simple.
(2) route selection accuracy rate is low.Currently, size and power current of the China using more each route zero-sequence current amplitude
Variable quantity comes while the comprehensive criterion principle that judges selects faulty line.This method route selection accuracy rate is low and by system operation side
The influence of formula.
Summary of the invention
In view of this, the purpose of the present invention is to propose to a kind of, distributed inverter and its dq transformation with route selection function are quiet
State decoupling control method can be selected on earth wire road, moreover it is possible to quickly quasi- when singlephase earth fault occurs for isolated neutral system
True selects faulty line.
The present invention is realized using following scheme: a kind of distributed inverter with route selection function, including DC power supply E,
First capacitor C1, the second capacitor C2, the first IGBTTa1, the 2nd IGBTTb1, the 3rd IGBTTc1, the 4th IGBTTn1, the 5th
IGBTTa2, the 6th IGBTTb2, the 7th IGBTTc2, the 8th IGBTTn2, the first reactance L1, the second reactance L2, third reactance L3With
Four reactance L4；The first capacitor C1One end and the second capacitor C2One end connection；The first capacitor C1The other end
With the first IGBTTa1One end, the 2nd IGBTTb1One end, the 3rd IGBTTc1One end and the described 4th
IGBTTn1One end connection, and be connected to the anode of the DC power supply E；The second capacitor C2The other end and described the
Five IGBTTa2One end, the 6th IGBTTb2One end, the 7th IGBTTc2One end, the 8th IGBTTn2One
End connection, and it is connected to the cathode of the DC power supply E；First IGBTTa1The other end and the 5th IGBTTa2
The other end connect and by the first reactance L1It is connected to isolated neutral system；2nd IGBTTb1The other end with it is described
6th IGBTTb2Other end connection, and pass through the second reactance L2It is connected to isolated neutral system；3rd IGBTTc1's
The other end and the 7th IGBTTc2Other end connection, and pass through the third reactance L3It is connected to isolated neutral system；It is described
4th IGBTTn1The other end and the 8th IGBTTn2Other end connection, and be connected to the 4th reactance L4One
End, the 4th reactance L4The other end ground connection；The first reactance L1, the second reactance L2, third reactance L3With the 4th reactance L4
Reactance value it is identical be L.
Further, the first capacitor C1, the second capacitor C2, the first IGBTTa1, the 2nd IGBTTb1, the 3rd IGBTTc1、
4th IGBTTn1, the 5th IGBTTa2, the 6th IGBTTb2, the 7th IGBTTc2, the 8th IGBTTn2Collector and emitter simultaneously
Join a diode.
Further, the first IGBTTa1With the 5th IGBTTa2, the 2nd IGBTTb1With the described 6th
IGBTTb2, the 3rd IGBTTc1With the 7th IGBTTc2, the 4th IGBTTn1With the 8th IGBTTn2Structure respectively
At a bridge arm of inverter, b bridge arm, c bridge arm, n bridge arm.
Further, the present invention also provides a kind of, and the dq based on the distributed inverter with route selection function converts steady-state solution
Coupling control method, comprising the following steps:
Step S1: carrying out modeling to inverter using Kirchhoff's law has:
Wherein, UaoIndicate a point voltage-to-ground；UboIndicate b point voltage-to-ground；UcoIndicate c point voltage-to-ground, ioIndicate zero
Sequence electric current；
Formula (1) is transformed to state equation
It is converted according to dq and is transformed to formula (2)
Wherein, Ud、UqFor the inversion command voltage for exchanging side；VdD shaft voltage amount after expression dq transformation；VqIndicate dq transformation
Q shaft voltage amount afterwards；
Step S2: U is obtained using decoupling control policyd, UqPI governing equation it is as follows；
In formula, kip、kilRespectively current ratio adjusts gain and integral adjustment gain；Ud、UqRefer to exchange the inversion of side
Enable voltage；For the inversion instruction current for exchanging side；
Step S3: the formula (4) in step S2 is brought into the formula (3) of step S1 and obtains formula (5)；
Step S4: when isolated neutral system single-phase earthing is run, a high-frequency constant is superimposed in inverter output current phase
Flow signal i0, by measuring i in each branch0Size and variation characteristic can select faulty line, specific formula is as follows:
Compared with prior art, the invention has the following beneficial effects:
(1) present invention not only can be by distributed generation resource energy conversion to network system, while can also be in isolated neutral system
Earth wire road is accurately selected when singlephase earth fault occurs, and is conducive to quickly isolate faulty line.
(2) the invention proposes a kind of, and the dq with route selection function converts Static Decoupling Control method, not only contributes to improve
The anti-interference ability of system, while can also fast and accurately select faulty line.
Detailed description of the invention
Fig. 1 is the three-phase and four-line inverter system with route selection function of the embodiment of the present invention.
Fig. 2 is that the dq with route selection function of the embodiment of the present invention converts electric current Static Decoupling Control schematic diagram.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
As distributed inverter constantly accesses isolated neutral system, a kind of band route selection function is present embodiments provided
The distributed inverter of energy, topological structure is as shown in Figure 1, include DC power supply E, first capacitor C1, the second capacitor C2,
One IGBTTa1, the 2nd IGBTTb1, the 3rd IGBTTc1, the 4th IGBTTn1, the 5th IGBTTa2, the 6th IGBTTb2, the 7th IGBTTc2、
8th IGBTTn2, the first reactance L1, the second reactance L2, third reactance L3With the 4th reactance L4；The first capacitor C1One end with
The second capacitor C2One end connection；The first capacitor C1The other end and the first IGBTTa1One end, described
Two IGBTTb1One end, the 3rd IGBTTc1One end and the 4th IGBTTn1One end connection, and be connected to described
The anode of DC power supply E；The second capacitor C2The other end and the 5th IGBTTa2One end, the 6th IGBTTb2's
One end, the 7th IGBTTc2One end, the 8th IGBTTn2One end connection, and be connected to the DC power supply E's
Cathode；First IGBTTa1The other end and the 5th IGBTTa2The other end connect and by the first reactance L1Even
It is connected to isolated neutral system；2nd IGBTTb1The other end and the 6th IGBTTb2Other end connection, and by described
Second reactance L2It is connected to isolated neutral system；3rd IGBTTc1The other end and the 7th IGBTTc2The other end connect
It connects, and passes through the third reactance L3It is connected to isolated neutral system；4th IGBTTn1The other end and the described 8th
IGBTTn2Other end connection, and be connected to the 4th reactance L4One end, the 4th reactance L4The other end ground connection；
The first reactance L1, the second reactance L2, third reactance L3With the 4th reactance L4Reactance value it is identical be L.
In Fig. 1: VSa、VSb、VScFor power grid three-phase phase voltage；L is inverter filter reactance；iSa、iSb、iSc、iSnIt is inverse
Variable power source exports electric current；Ta1、Tb1、Tc1、Tn1、Ta2、Tb2、Tc2、Tn2For switching tube driving signal；Device for power switching uses
IGBT module；C1、C2For DC side voltage regulation capacitor and C1=C2；E is DC power supply.
In the present embodiment, the first capacitor C1, the second capacitor C2, the first IGBTTa1, the 2nd IGBTTb1, third
IGBTTc1, the 4th IGBTTn1, the 5th IGBTTa2, the 6th IGBTTb2, the 7th IGBTTc2, the 8th IGBTTn2Collector and transmitting
A diode extremely in parallel.
In the present embodiment, the first IGBTTa1With the 5th IGBTTa2, the 2nd IGBTTb1With the described 6th
IGBTTb2, the 3rd IGBTTc1With the 7th IGBTTc2, the 4th IGBTTn1With the 8th IGBTTn2Structure respectively
At a bridge arm of inverter, b bridge arm, c bridge arm, n bridge arm.
Preferably, the present embodiment also provides a kind of dq transformation steady-state solution based on the distributed inverter with route selection function
Coupling control method, comprising the following steps:
Step S1: carrying out modeling to inverter using Kirchhoff's law has:
Wherein, as shown in Figure 1, UaoIndicate a point voltage-to-ground；UboIndicate b point voltage-to-ground；UcoIndicate that c point is electric over the ground
Pressure；ioIndicate zero-sequence current；
Formula (1) is transformed to state equation
It is converted according to dq and is transformed to formula (2)
Wherein, Ud、UqFor the inversion command voltage for exchanging side；VdD shaft voltage amount after expression dq transformation, VqIndicate dq transformation
Q shaft voltage amount afterwards；
In this way, inverter ac side is converted into the DC quantity in synchronous rotating frame, setting for control system is simplified
Meter.Although the fundamental wave sinusoidal variable in three-phase symmetrical rest frame is converted into synchronous rotating frame after dq is converted
In DC quantity, simplify the design of control system, but from formula (3) as can be seen that this is a strongly coupled system, q shaft current
Variation have an impact to the electric current of d axis, and the variation of d shaft current also has an impact to q axis, i.e., d, q shaft current remove controlled amount Ud、
UqOutside influencing, also by coupling terms ω Liq、ωLidDisturbance and voltage on line side Vd、VqInfluence.
Step S2: U is obtained using decoupling control policyd, UqPI governing equation it is as follows；
In formula, kip、kilRespectively current ratio adjusts gain and integral adjustment gain；Ud、UqRefer to exchange the inversion of side
Enable voltage；For the inversion instruction current for exchanging side；
Step S3: the formula (4) in step S2 is brought into the formula (3) of step S1 and obtains formula (5)；
Step S4: when isolated neutral system single-phase earthing is run, a high-frequency constant is superimposed in inverter output current phase
Flow signal i0, by measuring i in each branch0Size and variation characteristic can select faulty line, specific formula is as follows:
Electric current Static Decoupling Control schematic diagram is converted by the dq with route selection function of the available Fig. 2 of above formula.
Preferably, the present embodiment studies a kind of distributed inverter power supply device with route selection function.The device not only can be with
By distributed generation resource energy conversion to network system, at the same can also isolated neutral system occur singlephase earth fault when earth wire
Road is selected.The present embodiment proposes a kind of three-phase four-wire system inverter structure with route selection function, and mentions for the structure
A kind of dq transformation electric current Static Decoupling Control method with route selection function is gone out.This method not only contributes to the anti-dry of raising system
Disturb ability, moreover it is possible to fast and accurately select faulty line.Meanwhile the device integrates route selection and inversion, it is effectively save
Equipment cost.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (4)
1. a kind of distributed inverter with route selection function, it is characterised in that: including DC power supply E, first capacitor C1, second
Capacitor C2, the first IGBT Ta1, the 2nd IGBT Tb1, the 3rd IGBT Tc1, the 4th IGBT Tn1, the 5th IGBT Ta2, the 6th IGBT
Tb2, the 7th IGBT Tc2, the 8th IGBT Tn2, the first reactance L1, the second reactance L2, third reactance L3With the 4th reactance L4；It is described
First capacitor C1One end and the second capacitor C2One end connection；The first capacitor C1The other end and described first
IGBT Ta1One end, the 2nd IGBT Tb1One end, the 3rd IGBT Tc1One end and the 4th IGBT Tn1's
One end connection, and it is connected to the anode of the DC power supply E；The second capacitor C2The other end and the 5th IGBT
Ta2One end, the 6th IGBT Tb2One end, the 7th IGBT Tc2One end, the 8th IGBT Tn2One end connect
It connects, and is connected to the cathode of the DC power supply E；The first IGBT Ta1The other end and the 5th IGBT Ta2's
The other end connects and by the first reactance L1It is connected to isolated neutral system；The 2nd IGBT Tb1The other end with it is described
6th IGBT Tb2Other end connection, and pass through the second reactance L2It is connected to isolated neutral system；The 3rd IGBT Tc1
The other end and the 7th IGBT Tc2Other end connection, and pass through the third reactance L3It is connected to isolated neutral system；Institute
State the 4th IGBT Tn1The other end and the 8th IGBT Tn2Other end connection, and be connected to the 4th reactance L4's
One end, the 4th reactance L4The other end ground connection；The first reactance L1, the second reactance L2, third reactance L3With the 4th reactance
L4Reactance value it is identical be L.
2. a kind of distributed inverter with route selection function according to claim 1, it is characterised in that: first electricity
Hold C1, the second capacitor C2, the first IGBT Ta1, the 2nd IGBT Tb1, the 3rd IGBT Tc1, the 4th IGBT Tn1, the 5th IGBT Ta2、
6th IGBT Tb2, the 7th IGBT Tc2, the 8th IGBT Tn2A collector and emitter diode in parallel.
3. a kind of distributed inverter with route selection function according to claim 2, it is characterised in that: described first
IGBT Ta1With the 5th IGBT Ta2, the 2nd IGBT Tb1With the 6th IGBT Tb2, the 3rd IGBT Tc1With
The 7th IGBT Tc2, the 4th IGBT Tn1With the 8th IGBT Tn2Respectively constitute a bridge arm, the b bridge of inverter
Arm, c bridge arm, n bridge arm.
4. a kind of quiet based on a kind of described in any item dq transformation of the distributed inverter with route selection function of claim 1-3
State decoupling control method, it is characterised in that: the following steps are included:
Step S1: carrying out modeling to inverter using Kirchhoff's law has:
Wherein, UaoIndicate a point voltage-to-ground；UboIndicate b point voltage-to-ground；UcoIndicate c point voltage-to-ground；ioIndicate zero sequence electricity
Stream；
Formula (1) is transformed to state equation
It is converted according to dq and is transformed to formula (2)
Wherein, Ud、UqFor the inversion command voltage for exchanging side；VdD shaft voltage amount after expression dq transformation；VqQ axis after expression dq transformation
Voltage；
Step S2: U is obtained using decoupling control policyd, UqPI governing equation it is as follows；
In formula, kip、kilRespectively current ratio adjusts gain and integral adjustment gain；Ud、UqElectricity is instructed to exchange the inversion of side
Pressure；For the inversion instruction current for exchanging side；
Step S3: the formula (4) in step S2 is brought into the formula (3) of step S1 and obtains formula (5)；
Step S4: when isolated neutral system single-phase earthing is run, a high frequency constant current letter is superimposed in inverter output current phase
Number i0, by measuring i in each branch0Size and variation characteristic can select faulty line, specific formula is as follows:
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