CN105186545A - Current balance control method of inverter, and inverter - Google Patents
Current balance control method of inverter, and inverter Download PDFInfo
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Abstract
The invention provides a yearly current balance control method and an inverter. Negative-sequence components d and q needing compensation in a loop are estimated through measuring the difference between an average value of an effective value of output currents of a photovoltaic inverter and an effective value of network-side currents, and then the negative-sequence components are added to the control loop for adjusting imbalance of the currents such that balance control of the currents is realized.
Description
Technical field
The present invention relates to a kind of inverter control method, relate to a kind of current balance type control method and inverter of inverter particularly.
Background technology
Along with the development of combining inverter technology, to be made up of numerous distributed grid-connected generator unit or the small-sized micro-capacitance sensor that participates in will become a kind of alternative power supply technique.But because the restriction of net capacity and transmission line impedance, may there is the state of three-phase imbalance in its line voltage.Caused by voltage imbalance question distributes mainly due to imbalance that is single-phase or nonlinear load.Because the residual voltage composition under non-equilibrium state is not present in three-phase three wire system, and at three-phase four wire system also by the earth-free impact eliminating residual voltage composition of transformer center.So the negative sequence voltage composition in three-phase imbalance voltage affects comparatively large comparatively speaking, can cause work problem with in electric loading.Once produce negative sequence voltage composition by a relatively large margin, electrical network will to motor load, and the using electricity systems such as converters impact, and such as loss increasing, operation irregularity are even out of service.Although some grid-connected using electricity systems by from control improvements of own device to strengthen the adaptibility to response to unbalanced source voltage, seldom have system active to compensate unbalanced source voltage.In the last few years, the combining inverter based on converters will play the role of an outbalance in small grids, not only provided the electric energy needed for the electric loading of locality, also participated in the improvement to the quality of power supply simultaneously.A kind of based on combining inverter the entirety that the method that current harmonics composition in net carries out distributed compensation is added into grid-connected system controlled in the middle of, but do not consider the compensation to negative sequence voltage.In electric power system, when electronics convertor assembly runs, voltage/current imbalance is unavoidable.Particularly when the current transformer such as wind-powered electricity generation, photovoltaic runs, three-phase voltage/current low voltage imbalance is comparatively common especially.So not only phase line is lossy, and the neutral line also produces loss, thus adds the loss of power network line.Current unbalance factor is larger, and line loss increment is also larger.
Summary of the invention
The object of the invention is: solve above-mentioned the deficiencies in the prior art and problem, due to the circuit impedance between the three-phase of photovoltaic DC-to-AC converter own, not identical to the circuit impedance of net side transmission line with photovoltaic DC-to-AC converter, and then it is unbalanced under causing photovoltaic DC-to-AC converter three-phase current stable state, propose a kind ofly to set up unbalance control loop by the control software design inside at photovoltaic DC-to-AC converter, suppress the current imbalance control method of netting side AC.
Technical scheme of the present invention: estimate the negative sequence component d needing in the loop to compensate by the mean value of effective value and the difference of current on line side effective value of measuring the output current of photovoltaic DC-to-AC converter, q, then described negative sequence component is added to inside control loop, the degree of unbalance of electric current is regulated.Realize controlling current imbalance.
The embodiment of the present invention provides a kind of current imbalance control method of inverter: it is characterized in that: described method comprises:
Step 1: sampling also calculates output current effective value Iv_rms, Iu_rms and Iw_rms of three-phase V, U, W of inverter respectively and calculates the mean value I_rms_avg of described inverter output current effective value;
Step 2: calculate the described output current effective value of inverter V, U, W phase and difference Iv_delta, Iu_delta and Iw_delta of described mean value respectively:
Iv_delta=Iv_rms–I_rms_avg;
Iu_delta=Iu_rms–I_rms_avg;
Iw_delta=Iw_rms–I_rms_avg;
Step 3: the described difference obtained according to step 2, calculate respectively U, V, W phase required compensation rate Iu_comp, Iv_comp, _ Iw_comp and and then calculation compensation amount negative phase-sequence d, the value Vdn_comp of q and Vqn_comp, balances the electric current of inverter according to Vdn_comp and Vqn_comp.
Preferably, carry out balance according to dn_comp and Vqn_comp to the electric current of inverter in described step 3 to comprise:
By park inverse transformation, negative sequence compensation amount Vdn_comp and Vqn_comp is transformed to positive sequence Alfa and Beta compensation rate vsan and vsbn respectively;
Positive and negative sequence compensation rate phase adduction is converted into DQ component by it with by park inverse transformation, and DQ component calculates the rotating vector that represents three-phase control information;
Rotating vector draws three-phase PWM control command through SVPWM conversion, thus control IGBT hardware circuit.
Preferably, mean value I_rms_avg is (Iv_rms+Iu_rms+Iw_rms)/3.
Preferably, when the described difference of a certain phase is less than the first threshold of setting, this quite secondary offset is that the offset of this phase last time adds k; When the described difference of a certain phase is greater than the Second Threshold of setting, this quite secondary offset is that the offset of this phase last time subtracts k; When the described difference of a certain phase is between first threshold and Second Threshold, this quite secondary offset is identical with the offset of this phase last time; K be greater than 0 constant.
Preferably, first threshold is identical with Second Threshold, is 7A.
Preferably, the value of above-mentioned compensation rate d, 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);
Obtain.
Further, Iu_comp, Iv_comp, Iw_comp are the offset of each phase of U, V, W.
The embodiment of the present invention proposes a kind of by the compensation rate of above-mentioned acquisition, adds to inside control loop, to the photovoltaic DC-to-AC converter that the degree of unbalance of electric current regulates.This inverter comprises IGBT circuit, unbalance compensator and controller;
Described unbalance compensator, for sampling and calculating output current effective value Iv_rms, Iu_rms and Iw_rms of three-phase V, U, W of inverter net side respectively and calculate the mean value I_rms_avg of described inverter output current effective value, calculates the described output current effective value of inverter V, U, W phase and difference Iv_delta, Iu_delta and Iw_delta of described mean value respectively;
According to described difference, calculate respectively U, V, W phase required compensation rate Iu_comp, Iv_comp, _ Iw_comp and and then the value Vdn_comp of calculation compensation amount d, q and Vqn_com;
Wherein: Iv_delta=Iv_rms – I_rms_avg;
Iu_delta=Iu_rms–I_rms_avg;
Iw_delta=Iw_rms–I_rms_avg；
Described controller is used for balancing the electric current of inverter according to Vdn_comp and Vqn_comp.
Preferably, described controller is used for, by park inverse transformation, negative sequence compensation amount Vdn_comp and Vqn_comp is transformed to positive sequence Alfa and Beta compensation rate vsan and vsbn respectively; Positive and negative sequence compensation rate phase adduction is converted into DQ component by it with by park inverse transformation, DQ component calculates one and represents the rotating vector of three-phase control information and rotating vector is drawn three-phase PWM control command through SVPWM conversion, thus control IGBT hardware circuit.
Preferably, described unbalance compensator is used for when the described difference of a certain phase is less than the first threshold of setting, is that the offset of this phase last time adds k by this quite secondary offset; When the described difference of a certain phase is greater than the Second Threshold of setting, be that the offset of this phase last time subtracts k by this quite secondary offset; When the described difference of a certain phase is between first threshold and Second Threshold, this quite secondary offset is identical with the offset of this phase last time; K be greater than 0 constant.
Preferably, described unbalance compensator is used for the value Vdn_comp being obtained compensation rate d, q by following formula, 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.
Beneficial effect
The negative sequence component d needing in the loop to compensate is estimated by the mean value of effective value and the difference of current on line side effective value of measuring the output current of photovoltaic DC-to-AC converter, q, then described negative sequence component is added to inside control loop, the degree of unbalance of electric current is regulated.Realize controlling current imbalance.
Accompanying drawing explanation
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.
Embodiment
Below in conjunction with the accompanying drawing of the embodiment of the present invention, check the technical scheme of the embodiment of the present invention, intactly describe, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, be the polar plot of electric current, for U phase, we suppose that the angle of current three-phase is 120 degree of standard, and the effective value I_delta_UA larger than other two-phases of U phase, as Fig. 1 shows.
At this moment, we ask electric current negative sequence component in this case by Vector rotation method, can show that negative phase-sequence vector dq axle is in FIG expressed as (0,1/3*I_delta_U).
In like manner, if V compares the situation of the large I_delta_VA of other two-phases, the negative-sequence current component calculated is
((-/2)*I_delta_V，(-1/2)*I_delta_V)
In like manner, if W compares the situation of the large I_delta_WA of other two-phases, the negative-sequence current component calculated is
((/2)*I_delta_W，(-1/2)*I_delta_W)
Like this, we have just been obtained the negative sequence component (when three-phase current phase angle is 120 degree) of electric current in these three cases by the effective value of three-phase current by Vector rotation method
And under actual conditions, photovoltaic DC-to-AC converter current on line side size may be different, but by decomposing, the superposition of three kinds of situations above can be classified as.So we just when three-phase current is similar to 120 degree, can be obtained the negative sequence component of electric current, then compensate in the opposite direction by current on line side effective value, thus suppress current unbalance factor.
Be illustrated in figure 2: the control structure simplified block diagram of photovoltaic DC-to-AC converter is as follows, our current imbalance controller input is three-phase current, and after calculating, show that each phase needs the negative sequence component value compensated, its concrete method is:
Step 1: sample and calculate three-phase output current effective value and the I_rms_avg that averages;
Step 2: the difference calculating the mean value that each phase output current effective value and step 1 obtain:
Iv_delta=Iv_rms–I_rms_avg;
Iu_delta=Iu_rms–I_rms_avg;
Iw_delta=Iu_rms–I_rms_avg;
Step 3: the difference obtained according to step 2, estimates the compensation rate d needed for each phase, the value of q.
Parameter declaration: above in control method: (be preferably 7A when described difference is less than the threshold value of setting, specifically can optionally set), the offset Iv_comp of this phase does not make and changes.
As shown in Figure 3, for the technical program, the flow chart (for V phase) of negative phase-sequence algorithm,
When Iv_delta is greater than the threshold value of setting, often run an algorithm, offset Iv_comp deducts 0.01; When Iv_delta is less than the threshold value of setting, often run an algorithm, offset Iv_comp adds 0.01; When Iv_delta is between the threshold range set, Iv_comp does not make and changes.Repeating like this by this programmed algorithm, just can obtain the suitable offset Iv_comp of this phase.In like manner can draw the offset Iu_comp of other two-phases, Iw_comp.
By following formula: the value Vdn_comp calculating negative phase-sequence d and q, Vqn_comp;
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, Vdn_comp and Vqn_comp is added main inverter control loop to compensate:
First by Park inverse transformation, negative sequence compensation amount Vdn_comp and Vqn_comp is transformed to Alf, Beta compensation rate vsan, vsbn; Then these two negative sequence compensation amounts again and the AlfaBeta component that calculated by positive sequence be added, then enter follow-up control loop.
Positive-negative sequence AlfaBeta compensation rate and be DQ component by park shift conversion, DQ component calculates the rotating vector (amplitude and angle) that represents three-phase control information, then this rotating vector draws three-phase PWM control command through SVPWM conversion below, thus the hardware circuits such as control IGBT.
The present invention is illustrated by above-described embodiment, but should be understood that, above-described embodiment just for the object of illustrating and illustrate, and is not intended to the present invention to be limited in described scope of embodiments.In addition it will be appreciated by persons skilled in the art that the present invention is not limited to above-described embodiment, more kinds of variants and modifications can also be made according to instruction of the present invention, within these variants and modifications all drop on the present invention's scope required for protection.Protection scope of the present invention defined by the appended claims and equivalent scope thereof.
Claims (10)
1. a current balance type control method for inverter, is characterized in that: described method comprises:
Step 1: sampling also calculates output current effective value Iv_rms, Iu_rms and Iw_rms of three-phase V, U, W of inverter respectively and calculates the mean value I_rms_avg of described inverter output current effective value;
Step 2: calculate the described output current effective value of inverter V, U, W phase and difference Iv_delta, Iu_delta and Iw_delta of described mean value respectively:
Iv_delta=Iv_rms–I_rms_avg;
Iu_delta=Iu_rms–I_rms_avg;
Iw_delta=Iw_rms–I_rms_avg;
Step 3: the described difference obtained according to step 2, calculate respectively U, V, W phase required compensation rate Iu_comp, Iv_comp, _ Iw_comp and and then calculation compensation amount negative phase-sequence d, the value Vdn_comp of q and Vqn_comp, balances the electric current of inverter according to Vdn_comp and Vqn_comp.
2. the method for claim 1, is characterized in that: carry out balance according to dn_comp and Vqn_comp to the electric current of inverter in described step 3 and comprise:
By park inverse transformation, negative sequence compensation amount Vdn_comp and Vqn_comp is transformed to positive sequence Alfa and Beta compensation rate vsan and vsbn respectively;
Positive and negative sequence compensation rate phase adduction is converted into DQ component by it with by park inverse transformation, and DQ component calculates the rotating vector that represents three-phase control information;
Rotating vector draws three-phase PWM control command through SVPWM conversion, thus control IGBT hardware circuit.
3. the method for claim 1, is characterized in that: described mean value I_rms_avg is (Iv_rms+Iu_rms+
Iw_rms）/3。
4. the method for claim 1, is characterized in that: when the described difference of a certain phase is less than the first threshold of setting, and this quite secondary offset is that the offset of this phase last time adds k; When the described difference of a certain phase is greater than the Second Threshold of setting, this quite secondary offset is that the offset of this phase last time subtracts k; When the described difference of a certain phase is between first threshold and Second Threshold, this quite secondary offset is identical with the offset of this phase last time; K be greater than 0 constant.
5. method as claimed in claim 3, it is characterized in that: first threshold is identical with Second Threshold, is 7A.
6. the method for claim 1, is characterized in that: the value Vdn_comp of described compensation rate d, q, and Vqn_comp;
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)。
7. an inverter, is characterized in that: described inverter comprises IGBT circuit, unbalance compensator and controller;
Described unbalance compensator, for sampling and calculating output current effective value Iv_rms, Iu_rms and Iw_rms of three-phase V, U, W of inverter net side respectively and calculate the mean value I_rms_avg of described inverter output current effective value, calculates the described output current effective value of inverter V, U, W phase and difference Iv_delta, Iu_delta and Iw_delta of described mean value respectively:
According to described difference, calculate respectively U, V, W phase required compensation rate Iu_comp, Iv_comp, _ Iw_comp and and then the value Vdn_comp of calculation compensation amount d, q and Vqn_com;
Wherein: Iv_delta=Iv_rms – I_rms_avg;
Iu_delta=Iu_rms–I_rms_avg;
Iw_delta=Iw_rms–I_rms_avg；
Described controller is used for balancing the electric current of inverter according to Vdn_comp and Vqn_comp.
8. inverter as claimed in claim 7, is characterized in that: described controller is used for, by park inverse transformation, negative sequence compensation amount Vdn_comp and Vqn_comp is transformed to positive sequence Alfa and Beta compensation rate vsan and vsbn respectively; Positive and negative sequence compensation rate phase adduction is converted into DQ component by it with by park inverse transformation, DQ component calculates one and represents the rotating vector of three-phase control information and rotating vector is drawn three-phase PWM control command through SVPWM conversion, thus control IGBT hardware circuit.
9. inverter as claimed in claim 7, is characterized in that: described unbalance compensator is used for when the described difference of a certain phase is less than the first threshold of setting, is that the offset of this phase last time adds k by this quite secondary offset; When the described difference of a certain phase is greater than the Second Threshold of setting, be that the offset of this phase last time subtracts k by this quite secondary offset; When the described difference of a certain phase is between first threshold and Second Threshold, this quite secondary offset is identical with the offset of this phase last time; K be greater than 0 constant.
10. inverter as claimed in claim 7, is characterized in that: described unbalance compensator is used for being obtained by following formula the value Vdn_comp of compensation rate d, q, 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)。
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| CN109103907A (en) * | 2018-09-26 | 2018-12-28 | 深圳市泰昂能源科技股份有限公司 | A kind of control method and device of three-phase imbalance compensation device |
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