CN105186545B - A kind of the current balance type control method and inverter of inverter - Google Patents
A kind of the current balance type control method and inverter of inverter Download PDFInfo
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Abstract
The present invention provides a kind of the current balance type control method and inverter of term, difference by measuring average value and the current on line side virtual value of the virtual value of the output current of photovoltaic DC-to-AC converter estimates the negative sequence component d for needing to compensate in the loop, q, then the negative sequence component is added to inside control loop, the degree of unbalancedness of electric current is adjusted, realizes and the balance of electric current is controlled.
Description
Technical field
The present invention relates to a kind of inverter control methods, a kind of current balance type control method more particularly to inverter and
Inverter.
Background technology
With the development of gird-connected inverter technology, the small-sized micro- electricity for being constituted or being participated in by numerous distributed grid-connected generator units
Net will become a kind of alternative power supply technique.But because the limitation of net capacity and transmission line impedance, network voltage
It is likely to occur the state of three-phase imbalance.Voltage imbalance question is mainly due to single-phase or nonlinear load uneven distribution institute
Cause.Because the residual voltage composition under non-equilibrium state is not present in three-phase three wire system, and three-phase four wire system also
The influence of residual voltage composition can be eliminated by the way that transformer center is earth-free.So the negative phase-sequence electricity in three-phase imbalance voltage
It is pressed into part to be in contrast affected, work problem can be caused in power load.Once generating negative sequence voltage by a relatively large margin
Composition, power grid will impact motor load, the electricity systems such as converters, for example, loss increase, work it is different
It is normal or even out of service.Although some grid-connected electricity systems are electric to power grid by reinforcing from the control improvement of own device
Unbalanced adaptibility to response is pressed, but few systems actively compensate unbalanced source voltage.In recent years, based on electricity
The gird-connected inverter of power electronic converter will play a more important role in small grids, not only provide local electricity consumption
Electric energy needed for load, while also assisting in the improvement to power quality.One kind based on gird-connected inverter to current harmonics in net at
The method that part carries out distributed compensation is added into the whole control of grid-connected system, but is not accounted for negative phase-sequence electricity
The compensation of pressure.In the power system, voltage/current imbalance is inevitable when electronics converter plant is run.Especially in wind
When the current transformers such as electricity, photovoltaic are run, three-phase voltage/current low voltage imbalance is even more relatively conventional.Not only phase line damages in this way
Consumption, and the neutral conductor also generates loss, to increase the loss of power network line.Current unbalance factor is bigger, line loss increment
It is bigger.
Invention content
The purpose of the present invention is：Solve the problems, such as above-mentioned the deficiencies in the prior art and, due to photovoltaic DC-to-AC converter itself
The circuit impedance of circuit impedance and photovoltaic DC-to-AC converter to net side transmission line between three-phase differs, and then causes photovoltaic inverse
Become unbalanced under device three-phase current stable state, proposes a kind of by adding uneven control inside the control software of photovoltaic DC-to-AC converter
Loop processed, to inhibit the current imbalance control method of net side AC.
Technical scheme of the present invention：By the average value and net side electricity that measure the virtual value of the output current of photovoltaic DC-to-AC converter
The difference of virtual value is flowed to estimate the negative sequence component d, the q that need to compensate in the loop, and the negative sequence component is then added to control
Inside loop, the degree of unbalancedness of electric current is adjusted.It realizes and current imbalance is controlled.
The embodiment of the present invention provides a kind of current imbalance control method of inverter：It is characterized in that：The method packet
It includes：
Step 1：Sample and calculate separately three-phase V, U, W of inverter output current virtual value Iv_rms, Iu_rms and
Iw_rms and the average value I_rms_avg that the inverter output current virtual value is calculated;
Step 2：Calculate separately the output current virtual value of inverter V, U, W phase and the difference Iv_ of the average value
Delta, Iu_delta and Iw_delta：
Iv_delta = Iv_rms – I_rms_avg;
Iu_delta = Iu_rms – I_rms_avg;
Iw_delta = Iw_rms – I_rms_avg;
Step 3：According to the difference that step 2 obtains, calculate separately compensation rate Iu_comp needed for U, V, W phase,
Iv_comp, _ Iw_comp and the value Vdn_comp and Vqn_comp for calculating compensation rate negative phase-sequence d, q in turn, according to Vdn_comp
The electric current of inverter is balanced with Vqn_comp.
Preferably, in the step 3 according to dn_comp and Vqn_comp to the electric current of inverter be balanced including：
Negative sequence compensation amount Vdn_comp and Vqn_comp are transformed to positive sequence Alfa and Beta respectively by park inverse transformations
Compensation rate vsan and vsbn；
Convert positive and negative sequence compensation rate phase adduction to by it and by park inverse transformations DQ components, DQ components are calculated
One rotating vector for representing three phase control information；
Rotating vector obtains three-phase PWM control instruction through SVPWM transformation, to control IGBT hardware circuits.
Preferably, average value I_rms_avg is（ Iv_rms+ Iu_rms+ Iw_rms）/3.
Preferably, when the difference of a certain phase is less than the first threshold of setting, which is the phase
The offset of last time adds k；When the difference of a certain phase is more than the second threshold of setting, which is the phase
The offset of last time subtracts k；When the difference of a certain phase is between first threshold and second threshold, the quite secondary offset
It is identical as the offset of the phase last time；K is the constant more than 0.
Preferably, first threshold is identical with second threshold, is 7A.
Preferably, above-mentioned compensation rate d, the value of q, Vdn_comp, Vqn_comp;
Pass through
Vdn_comp = Iu_comp + Iv_comp*(-0.5) + _Iw_comp*(-0.5);
Vqn_comp = Iv_comp*(-0.866) + Iw_comp*(0.866);
It obtains.
Further, the offset of each phases of Iu_comp, Iv_comp, Iw_comp U, V, W.
The embodiment of the present invention proposes a kind of compensation rate by above-mentioned acquisition, is added to inside control loop, not to electric current
The photovoltaic DC-to-AC converter that the degree of balance is adjusted.The inverter includes IGBT circuits, unbalance compensator and controller；
The output current for three-phase V, U, W that the unbalance compensator is used to sampling and calculating separately inverter net side is effective
Value Iv_rms, Iu_rms and Iw_rms and the average value I_rms_avg that the inverter output current virtual value is calculated, point
Do not calculate the output current virtual value of inverter V, U, W phase and difference Iv_delta, Iu_delta of the average value and
Iw_delta；
According to the difference, compensation rate Iu_comp, Iv_comp needed for U, V, W phase is calculated separately, _ Iw_comp goes forward side by side
And compensation rate d is calculated, the value Vdn_comp and Vqn_com of q；
Wherein：Iv_delta = Iv_rms – I_rms_avg;
Iu_delta = Iu_rms – I_rms_avg;
Iw_delta = Iw_rms – I_rms_avg；
The controller is for being balanced the electric current of inverter according to Vdn_comp and Vqn_comp.
Preferably, the controller is used to distinguish negative sequence compensation amount Vdn_comp and Vqn_comp by park inverse transformations
It is transformed to positive sequence Alfa and Beta compensation rate vsan and vsbn；Positive and negative sequence compensation rate phase adduction by it and is passed through into park inversions
It changes and is converted into DQ components, DQ components are calculated the rotating vector that one represents three phase control information and pass through rotating vector
SVPWM transformation obtains three-phase PWM control instruction, to control IGBT hardware circuits.
Preferably, the unbalance compensator is used for when the difference of a certain phase is less than the first threshold of setting, will
The quite secondary offset is that the offset of the phase last time adds k；When the difference of a certain phase is more than the second threshold of setting,
The offset that the quite secondary offset is the phase last time is subtracted into k；When the difference of a certain phase is in first threshold and the second threshold
It is when between value, the quite secondary offset is identical as the offset of the phase last time；K is the constant more than 0.
Preferably, the unbalance compensator is used to obtain the value Vdn_comp of compensation rate d, q by following equation, and
Vqn_comp;
Vdn_comp = Iu_comp + Iv_comp*(-0.5) + _Iw_comp*(-0.5);
Vqn_comp = Iv_comp*(-0.866) + Iw_comp*(0.866)。
Above-mentioned inverter is three-phase inverter.
Advantageous effect
Difference by measuring average value and the current on line side virtual value of the virtual value of the output current of photovoltaic DC-to-AC converter is estimated
Negative sequence component d, the q for needing to compensate in the loop are calculated, then the negative sequence component is added to inside control loop, to electric current
Degree of unbalancedness is adjusted.It realizes and current imbalance is controlled.
Description of the drawings
Fig. 1 is the polar plot of the electric current of the embodiment of the present invention,
Fig. 2 is the control structure simplified block diagram of the photovoltaic DC-to-AC converter of the embodiment of the present invention,
Fig. 3 is the flow chart of the negative sequence compensation algorithm of the embodiment of the present invention,
Fig. 4 is the control loop schematic diagram of the photovoltaic DC-to-AC converter of the embodiment of the present invention.
Specific implementation mode
Below in conjunction with the attached drawing of the embodiment of the present invention, the technical solution of the embodiment of the present invention is checked, completely
Description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
It is the polar plot of electric current, by taking U phases as an example as shown in Fig. 1, it will be assumed that the angle of current three-phase is standard
120 degree, the virtual value I_delta_U A bigger than other two-phases of U phases, as Fig. 1 shows.
At this moment, we seek electric current negative sequence component in this case by Vector rotation method, can show that negative phase-sequence vector exists
Dq axis in Fig. 1 is expressed as（0,1/3*I_delta_U）.
Similarly, if the case where V is compared to other two-phases big I_delta_V A, the negative-sequence current component calculated is
((-/2) * I_delta_V, (- 1/2) * I_delta_V)
Similarly, if the case where W is compared to other two-phases big I_delta_W A, the negative-sequence current component calculated is
((/ 2) * I_delta_W, (- 1/2) * I_delta_W)
In this way, we have just found out electric current by Vector rotation method by the virtual value of three-phase current in these three cases
Negative sequence component (in the case where three-phase current phase angle is 120 degree)
And under actual conditions, photovoltaic DC-to-AC converter current on line side size is possibly different from, but can all be returned by decomposing
For the superposition of three kinds of situations above.So we can pass through current on line side in the case where three-phase current is 120 degree approximate
Virtual value finds out the negative sequence component of electric current, then compensates in the opposite direction, to inhibit current unbalance factor.
As Fig. 2 is shown：The control structure simplified block diagram of photovoltaic DC-to-AC converter is as follows, our current imbalance controller
Input is three-phase current, show that the negative sequence component value that each phase needs compensate, specific method are after calculating：
Step 1：Sample and calculate three-phase output current virtual value and the I_rms_avg that averages;
Step 2：Calculate the difference for the average value that each phase output current virtual value is obtained with step 1：
Iv_delta = Iv_rms – I_rms_avg;
Iu_delta = Iu_rms – I_rms_avg;
Iw_delta = Iu_rms – I_rms_avg;
Step 3：According to the difference that step 2 obtains, the value of the compensation rate d, q needed for each phase are estimated.
Parameter declaration：Above in control method：When the difference is less than the threshold value of setting（Preferably 7A specifically may be used
Optionally set）, the offset Iv_comp of the phase is without modification.
It is the technical program, the flow chart of negative phase-sequence algorithm as shown in Fig. 3（By taking V phases as an example）,
When Iv_delta is more than the threshold value of setting, an algorithm is often run, offset Iv_comp subtracts 0.01；When
When Iv_delta is less than the threshold value of setting, an algorithm is often run, offset Iv_comp adds 0.01；When Iv_delta is being set
When between fixed threshold range, Iv_comp is without modification.Repeating by the programmed algorithm in this way can obtain the phase
Suitable offset Iv_comp.It can similarly obtain the offset Iu_comp, Iw_comp of other two-phases.
Pass through following formula：Calculate the value Vdn_comp, Vqn_comp of negative phase-sequence d and q;
Vdn_comp = Iu_comp + Iv_comp*(-0.5) + _Iw_comp*(-0.5);
Vqn_comp = Iv_comp*(-0.866) + Iw_comp*(0.866)。
As shown in Figure 4：Main inverter control loop compensates schematic diagram, and master is added in Vdn_comp and Vqn_comp
Inverter control loop compensates:
It first passes through Park inverse transformations and negative sequence compensation amount Vdn_comp and Vqn_comp is transformed to Alf, Beta compensation rates
vsan,vsbn；Then the two negative sequence compensation amounts are added with the Alfa Beta components calculated by positive sequence again, subsequently into follow-up
Control loop.
Positive-negative sequence Alfa Beta compensation rates and be DQ components by park shift conversions, a generation is calculated in DQ components
The rotating vector of three phase control information of table（Amplitude and angle）, then process subsequent SVPWM transformation obtains this rotating vector
Three-phase PWM control instruction, to control the hardware circuits such as IGBT.
The present invention is illustrated by above-described embodiment, but it is to be understood that, above-described embodiment is only intended to
The purpose of citing and explanation, and be not intended to limit the invention within the scope of described embodiment.In addition people in the art
It is understood that the invention is not limited in above-described embodiment, introduction according to the present invention can also be made more kinds of member
Variants and modifications, these variants and modifications are all fallen within scope of the present invention.Protection scope of the present invention by
The appended claims and its equivalent scope are defined.
Claims (4)
1. a kind of current balance type control method of inverter, which is characterized in that the method includes：
Step 1：Sample and calculate separately output current virtual value Iv_rms, Iu_rms and Iw_ of three-phase V, U, W of inverter
Rms and the average value I_rms_avg that the inverter output current virtual value is calculated；
Step 2：Calculate separately the output current virtual value of three-phase V, U, W of the inverter and the difference Iv_ of the average value
Delta, Iu_delta and Iw_delta：
Iv_delta=Iv_rms–I_rms_avg；
Iu_delta=Iu_rms–I_rms_avg；
Iw_delta=Iw_rms–I_rms_avg；
Step 3：According to the difference that step 2 obtains, compensation rate Iu_comp, Iv_ needed for U, V, W phase is calculated separately
Comp, Iw_comp and and then calculate the value Vdn_comp and Vqn_comp of negative phase-sequence d, q compensation rate, according to Vdn_comp and
Vqn_comp is balanced the output current of the inverter；
Wherein, the value Vdn_comp and Vqn_comp of the negative phase-sequence d, q compensation rates are obtained by following formula：
Vdn_comp=Iu_comp+Iv_comp*(-0.5)+Iw_comp*(-0.5)；
Vqn_comp=Iv_comp*(-0.866)+Iw_comp*(0.866)；
Wherein, when the difference of a certain phase is less than the first threshold of setting, which is the phase last time
Offset adds k；When the difference of a certain phase is more than the second threshold of setting, which is the phase last time
Offset subtracts k；When the difference of a certain phase is between first threshold and second threshold, the quite secondary offset and the phase
The offset of last time is identical；K is the constant more than 0.
2. the method as described in claim 1, which is characterized in that according to Vdn_comp and Vqn_comp in the step 3
To the electric current of inverter be balanced including：
The negative phase-sequence d, q compensation rates Vdn_comp and Vqn_comp are transformed to positive sequence Alfa respectively by park inverse transformations
With Beta compensation rates vsan and vsbn；
Convert positive and negative sequence compensation rate phase adduction to by it and by park inverse transformations DQ components, DQ components are calculated one
A rotating vector for representing three phase control information；
Rotating vector obtains three-phase PWM control instruction through SVPWM transformation, to control IGBT hardware circuits.
3. the method as described in claim 1, which is characterized in that the average value I_rms_avg is（Iv_rms+Iu_rms+
Iw_rms）/3.
4. a kind of inverter, it is characterised in that：The inverter includes IGBT circuits, unbalance compensator and controller；
The unbalance compensator is used to sample and calculate separately the output current virtual value Iv_ of three-phase V, U, W of inverter
Rms, Iu_rms and Iw_rms and the average value I_rms_avg that the inverter output current virtual value is calculated, respectively
Calculate difference Iv_delta, Iu_delta of the output current virtual value and the average value of described inverter three-phase V, U, W
And Iw_delta：According to the difference, compensation rate Iu_comp, Iv_comp, Iw_comp needed for U, V, W phase are calculated separately
And the value Vdn_comp and Vqn_com of negative phase-sequence d, q compensation rate are calculated in turn；
Wherein：Iv_delta=Iv_rms–I_rms_avg；
Iu_delta=Iu_rms–I_rms_avg；
Iw_delta=Iw_rms–I_rms_avg；
The controller is for being balanced the electric current of inverter according to Vdn_comp and Vqn_comp；
The controller is additionally operable to be transformed to negative sequence compensation amount Vdn_comp and Vqn_comp respectively by park inverse transformations
Positive sequence Alfa and Beta compensation rate vsan and vsbn；Positive and negative sequence compensation rate phase adduction by it and is passed through into park inverse transformations
DQ components are converted into, DQ components are calculated the rotating vector that one represents three phase control information and pass through rotating vector
SVPWM transformation obtains three-phase PWM control instruction, to control IGBT hardware circuits；
The unbalance compensator is used for when the difference of a certain phase is less than the first threshold of setting, by the quite secondary benefit
It repays the offset that value is the phase last time and adds k；It is when the difference of a certain phase is more than the second threshold of setting, this is quite secondary
Offset is that the offset of the phase last time subtracts k；When the difference of a certain phase is between first threshold and second threshold, by this
Quite secondary offset is identical as the offset of the phase last time；K is the constant more than 0；
The unbalance compensator is used to obtain the value Vdn_comp and Vqn_comp of negative phase-sequence d, q compensation rate by following equation：
Vdn_comp=Iu_comp+Iv_comp*(-0.5)+Iw_comp*(-0.5)；
Vqn_comp=Iv_comp*(-0.866)+Iw_comp*(0.866)。
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| CN108336748B (en) * | 2018-01-10 | 2021-06-08 | 中船重工鹏力（南京）新能源科技有限公司 | Three-phase active current specified unbalance compensation instruction extraction method |
| CN108616135B (en) * | 2018-07-12 | 2023-11-24 | 陕西科技大学 | Device and method for preventing three-phase imbalance countercurrent of user side of distributed photovoltaic power station |
| CN109103907B (en) * | 2018-09-26 | 2021-02-12 | 深圳市泰昂能源科技股份有限公司 | Control method and device of three-phase unbalance compensation device |
| CN112798877A (en) * | 2020-12-29 | 2021-05-14 | 广东电网有限责任公司 | Three-phase current unbalance warning device |
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