CN105680714A - Control method and device for output voltage of inverter - Google Patents
Control method and device for output voltage of inverter Download PDFInfo
- Publication number
- CN105680714A CN105680714A CN201410662816.0A CN201410662816A CN105680714A CN 105680714 A CN105680714 A CN 105680714A CN 201410662816 A CN201410662816 A CN 201410662816A CN 105680714 A CN105680714 A CN 105680714A
- Authority
- CN
- China
- Prior art keywords
- inverter
- calculation
- pir
- voltage
- result
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Inverter Devices (AREA)
Abstract
The invention discloses a control method and device for an output voltage of an inverter. The method comprises the following steps: carrying out coordinate transformation on three-phase output voltages which are output to a load by the inverter and obtaining a first voltage feedback value Ud and a second voltage feedback value Uq under a dq coordinate system; calculating the first voltage feedback value Ud and a preset first load voltage value Ud* by a first adder, outputting a first calculation result, carrying out PIR control on the first calculation result and outputting a first compensation AC quantity; calculating the second voltage feedback value Uq and a preset second load voltage value Uq* by a second adder, outputting a second calculation result, carrying out PIR control on the second calculation result and outputting a second compensation AC quantity; carrying out inverse coordinate transformation on the first compensation AC quantity and the second compensation AC quantity to obtain three-phase compensation voltages, carrying out sine pulse width modulation on the three-phase compensation voltages to obtain pulse signals; and transmitting the pulse signals to the inverter as compensation quantities.
Description
Technical field
The present invention relates to technical field of inverter control, particularly relate to control method and the device of a kind of inverter output voltage.
Background technology
Inverter is by the AC energy of low quality obtained from grid side or the high-quality AC energy converted to by the electric energy that direct-flow storage battery, other various regenerative resources (such as wind energy, solar energy) produce, to meet the requirement of load, thus giving sensitive power electronic equipment, therefore inverter is one of important component part of power electronic equipment. In current application, the requirement of the quality of power supply of power supply being improved constantly, simultaneously along with the fast development of distributed generation system, the importance of inverter also becomes more obvious. One of novel key technology of distributed generation system is to develop the power electronic equipment that electrical network of sening as an envoy to reliably connects with various TRTs, and inverter is exactly the core apparatus of this power electronic equipment.
At present, the research and development of the conventional inverter based on linear load are fairly perfect and ripe, and the feature of the novel inverter based on nonlinear load and the research of performance is little. This and current extensive work are nonsynchronous in the extensive use of the power electronic equipment of nonlinear load. Therefore the feature of the inverter based on nonlinear load and performance are carried out research significant.
The development trend of distributed power generation is the micro-capacitance sensor application of multiple inverter composition. In most of the cases, the load in real system should be containing nonlinear load. Inverter except the conversion completing electric energy alternating current-direct current form is outer also should be able at the electric energy of offer stable high-quality amount under linear and nonlinear load. Two kinds of existing inverter control methods introduced below:
(1) power vs. voltage-electric current three close-loop control method
The method utilizes droop characteristic to devise the outer ring controller of power of inverter, the outer ring controller of the power of this inverter not only utilizes voltage close loop controller to improve the control ability to inverter output end voltage, and utilize closed-loop current control device to improve the response speed of system, most importantly it achieves the inverter automatic power distribution function based on local information. Stronger for traditional electrical network practicality based on perception of high Hair Fixer, transmission line of electricity impedance, but for the line impedance system based on resistive Distribution network, the control performance of above-mentioned control method is had a negative impact for chief commander by line impedance with resistive. In the method, inverter can pass through the adjustment to its voltage and current closed loop control parameters, making inverter equivalent output impedance for perceptual in fundamental frequency section, thus realizing the adjustment effect to circuit resistance sense ratio, improving the power allocation performance of inverter.
The shortcoming of the method is as follows: owing in power vs. voltage-electric current three close-loop control method, setting voltage and closed-loop current control parameter need to take into account the stability requirement of inverter, in this way that inverter is relatively small by the output impedance range of accommodation of Dai Weinan or Norton equivalent, improvement limited use to inverter output voltage control performance under nonlinear load operating mode.
(2) virtual impedance control method
In order to overcome " power vs. voltage-electric current " three ring droop control performance line impedance based on resistive adverse effect, to improve inverter power control performance, it is proposed that virtual impedance control method. The method by deducting inverter output current mode of pressure drop on virtual impedance from voltage close loop instruction, the adjustment to virtual impedance is utilized to realize the adjustment to inverter equivalent output impedance, and then achieve the adjustment effect to line impedance ratio, this method compared with above-mentioned three close-loop control method, can effectively limiting circuitry impedance with resistive for the main adverse effect to inverter output power control performance.
The shortcoming of the method is as follows: virtual impedance control method is adjusted mainly for FREQUENCY IMPEDANCE proportioning, it is impossible to realize the adjustment of inverter harmonic impedance, so cannot to nonlinear load when inverter output voltage be adjusted.
Therefore, for the problem under nonlinear load operating mode, inverter output voltage improved, do not suggest that effective solution at present.
Summary of the invention
The invention provides the control method of a kind of inverter output voltage and device, with the problem at least solving how under nonlinear load operating mode, inverter output voltage to be improved.
According to an aspect of the invention, it is provided the control method of a kind of inverter output voltage, including: inverter is exported and carries out coordinate transform to the three-phase output voltage of load, obtain the first voltage feedback value U under dq coordinate systemdWith the second voltage feedback value Uq; Utilize first adder to described first voltage feedback value UdWith the first default load voltage values Ud *It is calculated, exports the first result of calculation, described first result of calculation is carried out proportional integral resonance (ProportionIntegralResonant, referred to as PIR) and controls, output the first compensation of ac; Utilize second adder to described second voltage feedback value UqWith the second default load voltage values Uq *It is calculated, exports the second result of calculation, described second result of calculation is carried out PIR control, output the second compensation of ac; Compensate of ac to described first and described second compensation of ac carries out anti-coordinate transform, obtain three-phase compensation voltages, described three-phase compensation voltages is carried out sinusoidal pulse width modulation, obtains pulse signal, described pulse signal is transferred to described inverter as compensation dosage.
In one embodiment, described first load voltage values Ud *With described first load voltage values Uq *It is DC quantity.
According to another aspect of the present invention, it is provided that the control method of a kind of inverter output voltage, including: inverter is exported and carries out coordinate transform to the three-phase output voltage of load, obtain the first voltage feedback value U under dq coordinate systemdWith the second voltage feedback value Uq; Utilize first adder to described first voltage feedback value UdWith the first default load voltage values Ud *It is calculated, exports the first result of calculation, described first result of calculation is carried out proportional integral resonance PIR and controls, output it as the first given value of current value Id *; Utilize second adder to described second voltage feedback value UqWith the second default load voltage values Uq *It is calculated, exports the second result of calculation, described second result of calculation is carried out PIR control, output it as the second given value of current value Iq *; The three-phase output electric current of described inverter is carried out coordinate transform, obtains the first current feedback values I under dq coordinate systemdWith the second current feedback values Iq;Utilize the 3rd adder to described first current feedback values IdWith described first given value of current value Id *It is calculated, exports the 3rd result of calculation, described 3rd result of calculation is carried out PIR control, output the first compensation of ac; Utilize the 4th adder to described second current feedback values IqWith described second given value of current value Iq *It is calculated, exports the 4th result of calculation, described 4th result of calculation is carried out PIR control, output the second compensation of ac; Compensate of ac to described first and described second compensation of ac carries out anti-coordinate transform, obtain three-phase compensation voltages, described three-phase compensation voltages is carried out sinusoidal pulse width modulation, obtains pulse signal, described pulse signal is transferred to described inverter as compensation dosage.
In one embodiment, described first load voltage values Ud *With described first load voltage values Uq *It is DC quantity.
According to an aspect of the invention, it is provided the control device of a kind of inverter output voltage, including: coordinate transformation unit, carry out coordinate transform for inverter is exported to the three-phase output voltage of load, obtain the first voltage feedback value U under dq coordinate systemdWith the second voltage feedback value Uq; First adder, for described first voltage feedback value UdWith the first default load voltage values Ud *It is calculated, exports the first result of calculation; First PIR controller, for described first result of calculation being carried out PIR control, output the first compensation of ac; Second adder, for described second voltage feedback value UqWith the second default load voltage values Uq *It is calculated, exports the second result of calculation; Second PIR controller, for described second result of calculation being carried out PIR control, output the second compensation of ac; Anti-coordinate transformation unit, carries out anti-coordinate transform for compensating of ac and described second compensation of ac to described first, obtains three-phase compensation voltages; Sinusoidal pulse width modulation unit, for described three-phase compensation voltages is carried out sinusoidal pulse width modulation, obtains pulse signal, as compensation dosage, described pulse signal is transferred to described inverter.
In one embodiment, described first load voltage values Ud *With described first load voltage values Uq *It is DC quantity.
In one embodiment, the transmission function of described first PIR controller and described second PIR controller is:Wherein, s represents time domain, KPFor proportionality coefficient, KIFor integral coefficient, KRFor resonance coefficient, ωcFor resonance cut-off frequency, 6 ω0For resonant frequency.
According to another aspect of the present invention, provide the control device of a kind of inverter output voltage, including: the first coordinate transformation unit, carry out coordinate transform for inverter is exported to the three-phase output voltage of load, obtain the first voltage feedback value U under dq coordinate systemdWith the second voltage feedback value Uq; First adder, for described first voltage feedback value UdWith the first default load voltage values Ud *It is calculated, exports the first result of calculation; First PIR controller, for described first result of calculation is carried out PIR control, outputs it as the first given value of current value Id *; Second adder, for described second voltage feedback value UqWith the second default load voltage values Uq *It is calculated, exports the second result of calculation; Second PIR controller, for described second result of calculation is carried out PIR control, outputs it as the second given value of current value Iq *; Second coordinate transformation unit, carries out coordinate transform for the three-phase of described inverter is exported electric current, obtains the first current feedback values I under dq coordinate systemdWith the second current feedback values Iq;3rd adder, for described first current feedback values IdWith described first given value of current value Id *It is calculated, exports the 3rd result of calculation; 3rd PIR controller, for described 3rd result of calculation being carried out PIR control, output the first compensation of ac; 4th adder, for described second current feedback values IqWith described second given value of current value Iq *It is calculated, exports the 4th result of calculation; 4th PIR controller, for described 4th result of calculation being carried out PIR control, output the second compensation of ac; Anti-coordinate transformation unit, carries out anti-coordinate transform for compensating of ac and described second compensation of ac to described first, obtains three-phase compensation voltages; Sinusoidal pulse width modulation unit, for described three-phase compensation voltages is carried out sinusoidal pulse width modulation, obtains pulse signal, as compensation dosage, described pulse signal is transferred to described inverter.
In one embodiment, described first load voltage values Ud *With described first load voltage values Uq *It is DC quantity.
In one embodiment, the transmission function of described first PIR controller, described second PIR controller, described 3rd PIR controller and described 4th PIR controller is:Wherein, s represents time domain, KPFor proportionality coefficient, KIFor integral coefficient, KRFor resonance coefficient, ωcFor resonance cut-off frequency, 6 ω0For resonant frequency.
By the control method of the inverter output voltage of the present invention and device, utilize PIR control, reduce the specific secondary equiva lent impedance of inverter, reduce the harmonic content of the inverter output voltage caused because of nonlinear load, realize the compensation to output harmonic wave voltage, thus improving the output voltage of the inverter powered for nonlinear load. Have only to increase by one group of resonance controlling unit simultaneously, compared to prior art, decrease controlling unit, it is achieved simple. It addition, adopt the control method of outer voltage current inner loop, it is possible not only to improve voltage, it is also possible to stabling current.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that limitation of the invention. In the accompanying drawings:
Fig. 1 is the topology diagram of the inverter of the embodiment of the present invention;
Fig. 2 a be the embodiment of the present invention nonlinear load under inverter first-harmonic equivalent schematic diagram;
Fig. 2 b be the embodiment of the present invention nonlinear load under inverter 5 subharmonic equivalent schematic diagram;
Fig. 2 c be the embodiment of the present invention nonlinear load under inverter 7 subharmonic equivalent schematic diagram;
Fig. 3 is the synchronous rotating frame schematic diagram comprising harmonic wave of the embodiment of the present invention;
Fig. 4 is the flow chart of the control method of the inverter output voltage of the embodiment of the present invention one;
Fig. 5 is the flow chart of the control method of the inverter output voltage of the embodiment of the present invention two;
Fig. 6 is the structured flowchart controlling device of the inverter output voltage of the embodiment of the present invention three;
Fig. 7 is the structured flowchart controlling device of the inverter output voltage of the embodiment of the present invention four;
Fig. 8 is the control schematic diagram of the inverter output voltage of the embodiment of the present invention five;
Fig. 9 is the control schematic diagram of the inverter output voltage of the embodiment of the present invention six.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on embodiments of the invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into protection scope of the present invention.
In the distributed generation unit except wind-power electricity generation and diesel power generation, major part is all require over inverter to realize the control of output. The topological structure of inverter is as it is shown in figure 1, the direct current component (U of front enddcWith electric capacity C1) can be the DC sources such as photovoltaic cell, accumulator, ultracapacitor, audion T1To T6And diode D1To D6Constitute inverter, its output after LC filters, supply load and electrical network. Under independent operation mode, the control target of inverter is the sine voltage of output three-phase symmetrical.
When the load in Fig. 1 is nonlinear load, such as the Switching Power Supply of PC, various convertible frequency air-conditioner, voltage frequency converter, electricity-saving lamp etc., these nonlinear loads can produce the harmonic current of 5,7 times in use, these harmonic current retroactions of 5,7 times export in internal resistance in inverter equivalence, the output voltage that can cause inverter comprises 5,7 subharmonic, thus affecting other load supplying quality.
Fig. 2 a is the inverter first-harmonic equivalent schematic diagram of the embodiment of the present invention, as shown in Figure 2 a, and VrefFor inverter equivalent voltage source; VoutFor inverter first-harmonic output voltage; ZneiFor inverter equivalent internal resistance, including wave filter with control parameter; ZlineFor line impedance; IloadFor first-harmonic load equivalent current source. Fig. 2 b is the inverter 5 subharmonic equivalent schematic diagram of the embodiment of the present invention, and Fig. 2 c is the inverter 7 subharmonic equivalent schematic diagram of the embodiment of the present invention, as shown in figs. 2 b and 2 c, and I5rdAnd I7rd5 subharmonic current sources that respectively nonlinear load causes and 7 subharmonic current sources, ZlineFor line impedance, Z5rdIt is the harmonic impedance that 5 subharmonic currents are corresponding, Z7rdIt is the harmonic impedance that 7 subharmonic currents are corresponding, Vout_5rdFor 5 subharmonic voltages of inverter output, Vout_7rd7 subharmonic voltages for inverter output.
Can be seen that the final output voltage of inverter is V according to superposition theoremout+Vout_5rd+Vout_7rd, wherein Vout_5rd=I5rd×Z5rd, Vout_7rd=I7rd×Z7rd. The harmonic impedance Z corresponding by reducing respective harmonic current5rdAnd Z7rdThe harmonic voltage V of inverter output can be reducedout_5rdAnd Vout_7rd. Specific subharmonic equiva lent impedance reduces, and the output voltage of inverter can improve.
For reducing by the equiva lent impedance of specific time, it is necessary to add 5,7 voltage compensations in controlling unit. If 5,7 subharmonic are extracted through band filter, it is necessary to the amount of given same frequency, amplitude and initial phase angle carrys out harmonic carcellation, and this is relatively difficult in practical implementations, wherein determines that initial phase angle is the most difficult part. It addition, also there is scheme to propose to carry out 5,7 subharmonic after rotating coordinate transformation control and compensation, but it needs to increase by two groups of controlling units, makes system control to thicken.
The synchronous rotating frame comprising harmonic voltage is as it is shown on figure 3, d, q represent first-harmonic rotating coordinate system, d in figure 3-5、q-5Represent-5 subharmonic rotating coordinate systems, d+7、q+7Representing+7 subharmonic rotating coordinate systems, ω represents angular velocity, and θ=ω t represents the anglec of rotation, and-5 ω represent and rotate with the angular velocity negative phase-sequence of 5 ω, and 7 ω represent and rotate with the angular velocity positive sequence of 7 ω.-5 show as DC quantity with+7 subharmonic voltages under each self-corresponding rotating coordinate system, but after coordinate transform, under first-harmonic rotating coordinate system d, q, show as 6 subharmonic, first-harmonic is still DC component, now comprises first-harmonic DC component and the harmonic component of 6 needs compensation under d, q coordinate system.This 6 order harmonic components is carried out suppressing to regulate by the solution of the present invention exactly.
Embodiment one
Present embodiments provide the control method of a kind of inverter output voltage. Fig. 4 is the flow chart of the control method of the inverter output voltage of the embodiment of the present invention one, and as shown in Figure 4, the method comprises the following steps:
Step S401, exports inverter and carries out coordinate transform to the three-phase output voltage of load, obtains the first voltage feedback value U under dq coordinate systemdWith the second voltage feedback value Uq。
If load is nonlinear load, three-phase output voltage includes: first-harmonic ,-5 subharmonic and 7 subharmonic, and after coordinate transform ,-5 subharmonic and 7 subharmonic show as 6 subharmonic, U under dq coordinate systemdAnd UqAll comprise first-harmonic DC quantity and 6 subharmonic of acs. Herein, adopting outer voltage to control, what carry out coordinate transform is the voltage of load input terminal.
Step S402, utilizes first adder to the first voltage feedback value UdWith the first default load voltage values Ud *It is calculated, exports the first result of calculation, the first result of calculation is carried out PIR control, output the first compensation of ac; Utilize second adder to the second voltage feedback value UqWith the second default load voltage values Uq *It is calculated, exports the second result of calculation, the second result of calculation is carried out PIR control, output the second compensation of ac.
Obtain the first compensation of ac and the second step compensating of ac can perform simultaneously. The computing that adder performs can be that load voltage values (set-point) deducts voltage feedback value, and what obtain is the magnitude of voltage (include direct current and exchange) needing to compensate. After PIR control, output needs the of ac (under dq coordinate system) compensated.
Step S403, compensates of ac to first and the second compensation of ac carries out anti-coordinate transform, obtains three-phase compensation voltages, three-phase compensation voltages is carried out sinusoidal pulse width modulation, obtains pulse signal, as compensation dosage, pulse signal is transferred to inverter. Wherein, to needing the of ac compensated to carry out anti-coordinate transform, obtaining the abc three-phase voltage needing to compensate, after sinusoidal pulse width modulation, obtain the pulse signal of correspondence, pulse signal can as the input of inverter.
Control method by the inverter output voltage of the present embodiment, utilize PIR control, reduce the specific secondary equiva lent impedance of inverter, reduce the harmonic content of the inverter output voltage caused because of nonlinear load, realize the compensation to output harmonic wave voltage, thus improving the output voltage of the inverter powered for nonlinear load. Have only to increase by one group of resonance controlling unit simultaneously, compared to prior art, decrease controlling unit, it is achieved simple.
Traditional harmonic suppressing method is mainly based on the pi regulator under positive sequence synchronous rotating frame, but pi regulator controls limited bandwidth, the PIR control method being combined with resonant regulator by traditional PI actuator is introduced in control strategy, by the resonant controller of specific time, improve loop gain, eliminate particular harmonic, play the effect reducing harmonic impedance. The resonance link increased is that net pressure harmonic wave is compensated, and reduces harmonic wave internal resistance.
Preferably, the first load voltage values Ud *With the first load voltage values Uq *It is DC quantity. Ud *And Uq *Can be targeted load voltage, it is possible to provided by voltage instruction. Ud *And Uq *Being given as DC quantity, being equivalent to harmonic content instruction is zero, when connecing balanced load (i.e. linear load), without-5 ,+7 subharmonic ,-5 ,+7 value of feedback U of voltagedAnd UqIt is equal to 0, say, that during to balanced load ,-5 ,+7 times Voltage loop is inoperative, also can even running when balanced load.
Embodiment two
Present embodiments provide the control method of another kind of inverter output voltage, the present embodiment and embodiment one are distinctive in that, embodiment one adopts univoltage outer shroud to control, the present embodiment adopts the double-loop control of outer voltage current inner loop, and current inner loop controls referring to following step S503 and step S504. As it is shown in figure 5, the method comprises the following steps:
Step S501, exports inverter and carries out coordinate transform to the three-phase output voltage of load, obtains the first voltage feedback value U under dq coordinate systemdWith the second voltage feedback value Uq。
Step S502, utilizes first adder to the first voltage feedback value UdWith the first default load voltage values Ud *It is calculated, exports the first result of calculation, the first result of calculation is carried out proportional integral resonance PIR and controls, output it as the first given value of current value Id *; Utilize second adder to the second voltage feedback value UqWith the second default load voltage values Uq *It is calculated, exports the second result of calculation, the second result of calculation is carried out PIR control, output it as the second given value of current value Iq *。
Step S503, carries out coordinate transform to the three-phase output electric current of inverter, obtains the first current feedback values I under dq coordinate systemdWith the second current feedback values Iq. If load is nonlinear load, three-phase output electric current includes: first-harmonic ,-5 subharmonic and 7 subharmonic, after coordinate transform ,-5 subharmonic and 7 subharmonic show as 6 subharmonic, I under dq coordinate systemdAnd IqAll comprise first-harmonic DC quantity and 6 subharmonic of acs.
Step S504, utilizes the 3rd adder to the first current feedback values IdWith the first given value of current value Id *It is calculated, exports the 3rd result of calculation, the 3rd result of calculation is carried out PIR control, output the first compensation of ac; Utilize the 4th adder to the second current feedback values IqWith the second given value of current value Iq *It is calculated, exports the 4th result of calculation, the 4th result of calculation is carried out PIR control, output the second compensation of ac.
Obtain the first compensation of ac and the second step compensating of ac can perform simultaneously. The computing that adder performs can be that given value of current value deducts current feedback values, and what obtain is the current value (include direct current and exchange) needing to compensate. After PIR control, output needs the of ac (under dq coordinate system) compensated.
Step S505, compensates of ac to first and the second compensation of ac carries out anti-coordinate transform, obtains three-phase compensation voltages, three-phase compensation voltages is carried out sinusoidal pulse width modulation, obtains pulse signal, as compensation dosage, pulse signal is transferred to inverter.
Control method by the inverter output voltage of the present embodiment, utilize PIR control, reduce the specific secondary equiva lent impedance of inverter, reduce the harmonic content of the inverter output voltage caused because of nonlinear load, realize the compensation to output harmonic wave voltage, thus improving the output voltage of the inverter powered for nonlinear load. Have only to increase by one group of resonance controlling unit simultaneously, compared to prior art, decrease controlling unit, it is achieved simple. Further, adopt the control method of outer voltage current inner loop, be possible not only to improve voltage, it is also possible to stabling current.
Preferably, the first load voltage values Ud *With the first load voltage values Uq *It is DC quantity.
Embodiment three
Based on same inventive concept, present embodiments provide the control device of a kind of inverter output voltage, it is possible to for realizing the method described by above-described embodiment one.Owing to the principle controlling device solution problem of inverter output voltage is similar to the control method of inverter output voltage, therefore the enforcement controlling device of inverter output voltage may refer to the enforcement of the control method of inverter output voltage, repeats part and repeats no more.
Fig. 6 is the structured flowchart controlling device of the inverter output voltage of the embodiment of the present invention three, as shown in Figure 6, the control device 100 of inverter output voltage includes: coordinate transformation unit 101, first adder the 102, first PIR controller 103, second adder the 104, second PIR controller 105, anti-coordinate transformation unit 106 and sinusoidal pulse width modulation unit 107. Below this structure is specifically described.
Coordinate transformation unit 101, is connected to the input of load 10, carries out coordinate transform for inverter 20 is exported to the three-phase output voltage of load 10, obtains the first voltage feedback value U under dq coordinate systemdWith the second voltage feedback value Uq。
First adder 102, is connected to coordinate transformation unit 101, for the first voltage feedback value UdWith the first default load voltage values Ud *It is calculated, exports the first result of calculation.
First PIR controller 103, is connected to first adder 102, for the first result of calculation being carried out PIR control, and output the first compensation of ac.
Second adder 104, is connected to coordinate transformation unit 101, for the second voltage feedback value UqWith the second default load voltage values Uq *It is calculated, exports the second result of calculation.
Second PIR controller 105, is connected to second adder 104, for the second result of calculation being carried out PIR control, and output the second compensation of ac.
Anti-coordinate transformation unit 106, is connected to the first PIR controller 103 and the second PIR controller 105, carries out anti-coordinate transform for compensating of ac and the second compensation of ac to first, obtains three-phase compensation voltages.
Sinusoidal pulse width modulation unit 107, is connected to anti-coordinate transformation unit 106, for three-phase compensation voltages is carried out sinusoidal pulse width modulation, obtains pulse signal, as compensation dosage, pulse signal is transferred to inverter 20.
By the control device of the inverter output voltage of the present embodiment, utilize PIR control, reduce the specific secondary equiva lent impedance of inverter, reduce the harmonic content of the inverter output voltage caused because of nonlinear load, realize the compensation to output harmonic wave voltage, thus improving the output voltage of the inverter powered for nonlinear load. Have only to increase by one group of resonance controlling unit simultaneously, compared to prior art, decrease controlling unit, it is achieved simple.
Preferably, the first load voltage values Ud *With the first load voltage values Uq *It is DC quantity.
Preferably, the transmission function of the first PIR controller 103 and the second PIR controller 105 is:Wherein, s represents time domain, KPFor proportionality coefficient, KIFor integral coefficient, KRFor resonance coefficient, ωcFor resonance cut-off frequency, 6 ω0For resonant frequency. Parameter value coupling system stability reduces the equiva lent impedance (or internal resistance) of specific subharmonic as far as possible.
Embodiment four
Based on same inventive concept, present embodiments provide the control device of another kind of inverter output voltage, it is possible to for realizing the method described by above-described embodiment two, repeat part and repeat no more. The present embodiment and embodiment three are distinctive in that, embodiment three adopts univoltage outer shroud to control, and the present embodiment adopts the double-loop control of outer voltage current inner loop.
As it is shown in fig. 7, the control device 200 of inverter output voltage includes: the first coordinate transformation unit 201, first adder the 202, first PIR controller 203, second adder the 204, second PIR controller the 205, second coordinate transformation unit the 206, the 3rd adder the 207, the 3rd PIR controller the 208, the 4th adder the 209, the 4th PIR controller 210, anti-coordinate transformation unit 211, sinusoidal pulse width modulation unit 212. Below its structure is described in detail.
First coordinate transformation unit 201, is connected to the input of load 10, carries out coordinate transform for inverter 20 is exported to the three-phase output voltage of load 10, obtains the first voltage feedback value U under dq coordinate systemdWith the second voltage feedback value Uq。
First adder 202, is connected to the first coordinate transformation unit 201, for the first voltage feedback value UdWith the first default load voltage values Ud *It is calculated, exports the first result of calculation.
First PIR controller 203, is connected to first adder 202, for the first result of calculation is carried out PIR control, outputs it as the first given value of current value Id *。
Second adder 204, is connected to the first coordinate transformation unit 201, for the second voltage feedback value UqWith the second default load voltage values Uq *It is calculated, exports the second result of calculation.
Second PIR controller 205, is connected to second adder 204, for the second result of calculation is carried out PIR control, outputs it as the second given value of current value Iq *。
Second coordinate transformation unit 206, is connected to the outfan of inverter 20, carries out coordinate transform for the three-phase of inverter 20 is exported electric current, obtains the first current feedback values I under dq coordinate systemdWith the second current feedback values Iq。
3rd adder 207, is connected to the second coordinate transformation unit 206, for the first current feedback values IdWith the first given value of current value Id *It is calculated, exports the 3rd result of calculation.
3rd PIR controller 208, is connected to the 3rd adder 207, for the 3rd result of calculation being carried out PIR control, and output the first compensation of ac.
4th adder 209, is connected to the second coordinate transformation unit 206, for the second current feedback values IqWith the second given value of current value Iq *It is calculated, exports the 4th result of calculation.
4th PIR controller 210, is connected to the 4th adder 209, for the 4th result of calculation being carried out PIR control, and output the second compensation of ac.
Anti-coordinate transformation unit 211, is connected to the 3rd PIR controller 208 and the 4th PIR controller 210, carries out anti-coordinate transform for compensating of ac and the second compensation of ac to first, obtains three-phase compensation voltages.
Sinusoidal pulse width modulation unit 212, is connected to anti-coordinate transformation unit 211, for three-phase compensation voltages is carried out sinusoidal pulse width modulation, obtains pulse signal, as compensation dosage, pulse signal is transferred to inverter 20.
By the control device of the inverter output voltage of the present embodiment, utilize PIR control, reduce the specific secondary equiva lent impedance of inverter, reduce the harmonic content of the inverter output voltage caused because of nonlinear load, realize the compensation to output harmonic wave voltage, thus improving the output voltage of the inverter powered for nonlinear load. Have only to increase by one group of resonance controlling unit simultaneously, compared to prior art, decrease controlling unit, it is achieved simple. Further, adopt the control method of outer voltage current inner loop, be possible not only to improve voltage, it is also possible to stabling current.
Preferably, the first load voltage values Ud *With the first load voltage values Uq *It is DC quantity.
Preferably, the transmission function of first PIR controller the 203, second PIR controller the 205, the 3rd PIR controller 208 and the 4th PIR controller 210 is:Wherein, s represents time domain, KPFor proportionality coefficient, KIFor integral coefficient, KRFor resonance coefficient, ωcFor resonance cut-off frequency, 6 ω0For resonant frequency.
Used above, term " unit " can realize the software of predetermined function and/or the combination of hardware. Although the system described by following example preferably realizes with software, but hardware, or the realization of the combination of software and hardware is also likely to and is contemplated.
Embodiment five
The present embodiment, on first-harmonic three close-loop control basis, increases by 6 resonance controlling units, adopts outer voltage control method, based on PIR control realization harmonic compensation. Traditional harmonic suppressing method is mainly based on the pi regulator under positive sequence synchronous rotating frame, but pi regulator controls limited bandwidth, the PIR control method being combined with resonant regulator by traditional PI actuator is introduced in control strategy, by the resonant controller of specific time, improve loop gain, eliminate particular harmonic, play the effect reducing harmonic impedance. Can not only realize output harmonic wave voltage is compensated, have only to increase by one group of resonance controlling unit simultaneously, compared to prior art, decrease controlling unit, it is achieved be simple.
Fig. 8 is the control schematic diagram of the inverter output voltage of the embodiment of the present invention five, and as shown in Figure 8, the dependency structure of inverter is identical with Fig. 1, Ua、Ub、UcFor inverter output voltage, outer voltage is adopted to control for first-harmonic link, Ud *And Uq *For load voltage outer shroud set-point under dq rotating coordinate system, UdAnd UqFor corresponding voltage feedback value, after adder calculating and PIR controller, output needs the 6 subharmonic of acs compensated, and after anti-coordinate transform and sinusoidal pulse width modulation, inputs as inverter pulse. ω t represents the anglec of rotation. In the present embodiment, control through univoltage outer shroud, it is possible to improve inverter output voltage.
Embodiment six
The present embodiment, on first-harmonic three close-loop control basis, increases by 6 resonance controlling units, adopts the double loop control of outer voltage current inner loop, based on PIR control realization harmonic compensation.
Fig. 9 is the control schematic diagram of the inverter output voltage of the embodiment of the present invention six, as it is shown in figure 9, Ia、Ib、IcFor inverter side electric current, Ua、Ub、UcFor inverter output voltage, first-harmonic link is adopted to the double-loop control of outer voltage current inner loop, Ud *And Uq *For load voltage outer shroud set-point under dq rotating coordinate system, UdAnd UqFor corresponding voltage feedback value, calculate and after PIR controller as the set-point I of electric current loop through adderd *And Iq *, after inverter side current sample, it is converted to rotating coordinate system, obtains IdAnd IqFor the value of feedback of electric current loop, after also passing through adder calculating and PIR proportional integral resonant controller, output needs the 6 subharmonic of acs compensated, after anti-coordinate transform and sinusoidal pulse width modulation, as inverter pulse input. ω t represents the anglec of rotation. In the present embodiment, through the double-loop control of outer voltage current inner loop, it is possible to improve inverter output voltage, simultaneously can stabling current.
By embodiment five and embodiment six it can be seen that by specific secondary resonant controller, improve loop gain, eliminate particular harmonic, play the effect reducing harmonic impedance. Have only to increase by one group of resonance controlling unit, compared to prior art, decrease controlling unit, achieve the compensating action of the inverter output harmonic wave voltage that nonlinear load is caused simply and effectively.
Describe in flow chart or in this any process described otherwise above or method and be construed as, represent and include the module of code of executable instruction of one or more step for realizing specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention includes other realization, wherein can not press order that is shown or that discuss, including according to involved function by basic mode simultaneously or in the opposite order, performing function, this should be understood by embodiments of the invention person of ordinary skill in the field.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example describe are contained at least one embodiment or the example of the present invention. In this manual, the schematic representation of above-mentioned term is not necessarily referring to identical embodiment or example. And, the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiments or example.
Particular embodiments described above; the purpose of the present invention, technical scheme and beneficial effect have been further described; it is it should be understood that; the foregoing is only specific embodiments of the invention; the protection domain being not intended to limit the present invention; all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (10)
1. the control method of an inverter output voltage, it is characterised in that including:
Inverter is exported and carries out coordinate transform to the three-phase output voltage of load, obtain the first voltage feedback value U under dq coordinate systemdWith the second voltage feedback value Uq;
Utilize first adder to described first voltage feedback value UdWith the first default load voltage values Ud *It is calculated, exports the first result of calculation, described first result of calculation is carried out proportional integral resonance PIR and controls, output the first compensation of ac;
Utilize second adder to described second voltage feedback value UqWith the second default load voltage values Uq *It is calculated, exports the second result of calculation, described second result of calculation is carried out PIR control, output the second compensation of ac;
Compensate of ac to described first and described second compensation of ac carries out anti-coordinate transform, obtain three-phase compensation voltages, described three-phase compensation voltages is carried out sinusoidal pulse width modulation, obtains pulse signal, described pulse signal is transferred to described inverter as compensation dosage.
2. method according to claim 1, it is characterised in that described first load voltage values Ud *With described first load voltage values Uq *It is DC quantity.
3. the control method of an inverter output voltage, it is characterised in that including:
Inverter is exported and carries out coordinate transform to the three-phase output voltage of load, obtain the first voltage feedback value U under dq coordinate systemdWith the second voltage feedback value Uq;
Utilize first adder to described first voltage feedback value UdWith the first default load voltage values Ud *It is calculated, exports the first result of calculation, described first result of calculation is carried out proportional integral resonance PIR and controls, output it as the first given value of current value Id *;
Utilize second adder to described second voltage feedback value UqWith the second default load voltage values Uq *It is calculated, exports the second result of calculation, described second result of calculation is carried out PIR control, output it as the second given value of current value Iq *;
The three-phase output electric current of described inverter is carried out coordinate transform, obtains the first current feedback values I under dq coordinate systemdWith the second current feedback values Iq;
Utilize the 3rd adder to described first current feedback values IdWith described first given value of current value Id *It is calculated, exports the 3rd result of calculation, described 3rd result of calculation is carried out PIR control, output the first compensation of ac;
Utilize the 4th adder to described second current feedback values IqWith described second given value of current value Iq *It is calculated, exports the 4th result of calculation, described 4th result of calculation is carried out PIR control, output the second compensation of ac;
Compensate of ac to described first and described second compensation of ac carries out anti-coordinate transform, obtain three-phase compensation voltages, described three-phase compensation voltages is carried out sinusoidal pulse width modulation, obtains pulse signal, described pulse signal is transferred to described inverter as compensation dosage.
4. method according to claim 3, it is characterised in that described first load voltage values Ud *With described first load voltage values Uq *It is DC quantity.
5. the control device of an inverter output voltage, it is characterised in that including:
Coordinate transformation unit, carries out coordinate transform for inverter is exported to the three-phase output voltage of load, obtains the first voltage feedback value U under dq coordinate systemdWith the second voltage feedback value Uq;
First adder, for described first voltage feedback value UdWith the first default load voltage values Ud *It is calculated, exports the first result of calculation;
First PIR controller, for described first result of calculation being carried out PIR control, output the first compensation of ac;
Second adder, for described second voltage feedback value UqWith the second default load voltage values Uq *It is calculated, exports the second result of calculation;
Second PIR controller, for described second result of calculation being carried out PIR control, output the second compensation of ac;
Anti-coordinate transformation unit, carries out anti-coordinate transform for compensating of ac and described second compensation of ac to described first, obtains three-phase compensation voltages;
Sinusoidal pulse width modulation unit, for described three-phase compensation voltages is carried out sinusoidal pulse width modulation, obtains pulse signal, as compensation dosage, described pulse signal is transferred to described inverter.
6. device according to claim 5, it is characterised in that described first load voltage values Ud *With described first load voltage values Uq *It is DC quantity.
7. device according to claim 5, it is characterised in that the transmission function of described first PIR controller and described second PIR controller is: Wherein, s represents time domain, KPFor proportionality coefficient, KIFor integral coefficient, KRFor resonance coefficient, ωcFor resonance cut-off frequency, 6 ω0For resonant frequency.
8. the control device of an inverter output voltage, it is characterised in that including:
First coordinate transformation unit, carries out coordinate transform for inverter is exported to the three-phase output voltage of load, obtains the first voltage feedback value U under dq coordinate systemdWith the second voltage feedback value Uq;
First adder, for described first voltage feedback value UdWith the first default load voltage values Ud *It is calculated, exports the first result of calculation;
First PIR controller, for described first result of calculation is carried out PIR control, outputs it as the first given value of current value Id *;
Second adder, for described second voltage feedback value UqWith the second default load voltage values Uq *It is calculated, exports the second result of calculation;
Second PIR controller, for described second result of calculation is carried out PIR control, outputs it as the second given value of current value Iq *;
Second coordinate transformation unit, carries out coordinate transform for the three-phase of described inverter is exported electric current, obtains the first current feedback values I under dq coordinate systemdWith the second current feedback values Iq;
3rd adder, for described first current feedback values IdWith described first given value of current value Id *It is calculated, exports the 3rd result of calculation;
3rd PIR controller, for described 3rd result of calculation being carried out PIR control, output the first compensation of ac;
4th adder, for described second current feedback values IqWith described second given value of current value Iq *It is calculated, exports the 4th result of calculation;
4th PIR controller, for described 4th result of calculation being carried out PIR control, output the second compensation of ac;
Anti-coordinate transformation unit, carries out anti-coordinate transform for compensating of ac and described second compensation of ac to described first, obtains three-phase compensation voltages;
Sinusoidal pulse width modulation unit, for described three-phase compensation voltages is carried out sinusoidal pulse width modulation, obtains pulse signal, as compensation dosage, described pulse signal is transferred to described inverter.
9. device according to claim 8, it is characterised in that described first load voltage values Ud *With described first load voltage values Uq *It is DC quantity.
10. device according to claim 8, it is characterised in that the transmission function of described first PIR controller, described second PIR controller, described 3rd PIR controller and described 4th PIR controller is: Wherein, s represents time domain, KPFor proportionality coefficient, KIFor integral coefficient, KRFor resonance coefficient, ωcFor resonance cut-off frequency, 6 ω0For resonant frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410662816.0A CN105680714A (en) | 2014-11-19 | 2014-11-19 | Control method and device for output voltage of inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410662816.0A CN105680714A (en) | 2014-11-19 | 2014-11-19 | Control method and device for output voltage of inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105680714A true CN105680714A (en) | 2016-06-15 |
Family
ID=56945662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410662816.0A Pending CN105680714A (en) | 2014-11-19 | 2014-11-19 | Control method and device for output voltage of inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105680714A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533289A (en) * | 2016-09-05 | 2017-03-22 | 清华大学 | Non-linear voltage control method and system |
| CN112564465A (en) * | 2019-09-26 | 2021-03-26 | 中车大连电力牵引研发中心有限公司 | Auxiliary inverter harmonic suppression method and device and vehicle |
| CN112803806A (en) * | 2021-03-18 | 2021-05-14 | 漳州科华技术有限责任公司 | Output voltage compensation method and voltage compensation device of inverter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4969080A (en) * | 1988-11-28 | 1990-11-06 | Mitsubishi Denki Kabushiki Kaisha | A method of decoupling a three-phase converter |
| CN1190279A (en) * | 1997-02-05 | 1998-08-12 | 三菱电机株式会社 | Controller of power converter |
| CN1385956A (en) * | 2002-02-07 | 2002-12-18 | 艾默生网络能源有限公司 | Inverter and output voltage control method |
| CN103606948A (en) * | 2013-10-10 | 2014-02-26 | 国电南瑞科技股份有限公司 | Asymmetric operation method of direct-driven wind power converter and based on PIR controller |
-
2014
- 2014-11-19 CN CN201410662816.0A patent/CN105680714A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4969080A (en) * | 1988-11-28 | 1990-11-06 | Mitsubishi Denki Kabushiki Kaisha | A method of decoupling a three-phase converter |
| CN1190279A (en) * | 1997-02-05 | 1998-08-12 | 三菱电机株式会社 | Controller of power converter |
| CN1385956A (en) * | 2002-02-07 | 2002-12-18 | 艾默生网络能源有限公司 | Inverter and output voltage control method |
| CN103606948A (en) * | 2013-10-10 | 2014-02-26 | 国电南瑞科技股份有限公司 | Asymmetric operation method of direct-driven wind power converter and based on PIR controller |
Non-Patent Citations (2)
| Title |
|---|
| 曾嵘等: "离网型风力发电系统逆变器控制技术研究", 《电力电子技术》 * |
| 龚文明等: "一种应用PIR控制器的双馈风力发电机组电流谐波控制方法", 《电工技术学报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533289A (en) * | 2016-09-05 | 2017-03-22 | 清华大学 | Non-linear voltage control method and system |
| CN106533289B (en) * | 2016-09-05 | 2019-02-26 | 陕西省地方电力设计有限公司 | A kind of non-linear voltage control method and system |
| CN112564465A (en) * | 2019-09-26 | 2021-03-26 | 中车大连电力牵引研发中心有限公司 | Auxiliary inverter harmonic suppression method and device and vehicle |
| CN112564465B (en) * | 2019-09-26 | 2022-09-02 | 中车大连电力牵引研发中心有限公司 | Auxiliary inverter harmonic suppression method and device and vehicle |
| CN112803806A (en) * | 2021-03-18 | 2021-05-14 | 漳州科华技术有限责任公司 | Output voltage compensation method and voltage compensation device of inverter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Abusara et al. | Improved droop control strategy for grid-connected inverters | |
| CN106849135B (en) | The power/current quality Synergistic method of microgrid inverter and active filter | |
| CN102510120B (en) | Micro-grid inverter voltage and current double-ring hanging control method based on virtual impedance | |
| CN106532749B (en) | A kind of micro-capacitance sensor imbalance power and harmonic voltage compensation system and its application | |
| CN109449999B (en) | Low pressure micro-capacitance sensor distributed control method and system based on adaptive virtual impedance | |
| CN105610182B (en) | A kind of the tandem type microgrid structure and its Poewr control method of isolated operation | |
| CN107887919B (en) | Distributed energy storage inverter coordination control method and system | |
| CN108494007A (en) | Virtual synchronous generator control method based on direct Power Control when unbalanced source voltage | |
| CN110086207A (en) | A kind of grid-connected converter Control method, apparatus of energy storage and computer storage medium | |
| CN110266196A (en) | No electrolytic capacitor frequency converter busbar voltage fluctuation suppressing method neural network based | |
| CN105680714A (en) | Control method and device for output voltage of inverter | |
| CN106786797A (en) | A kind of control method of the microgrid inverter for improving microgrid busbar voltage quality | |
| CN110266044B (en) | Microgrid grid-connected control system and method based on energy storage converter | |
| CN104795836B (en) | A kind of single-phase photovoltaic grid-connected generating detecting system and its non-linear current control method | |
| Cleary-Balderas et al. | Hybrid active power filter based on the IRP theory for harmonic current mitigation | |
| KR102136513B1 (en) | Method and apparatus for cooperative control of a group of series voltage source converter valves | |
| Rajakumar et al. | Enhancement of power quality using double‐band hysteresis controller for the grid integrated renewable energy system | |
| Sabat et al. | GLMS control strategy based DSTATCOM for PQ enhancement: modeling and comparative analysis | |
| CN109390950B (en) | UPQC coordination control method and system | |
| Chen | A control strategy of islanded microgrid with nonlinear load for harmonic suppression | |
| CN109802434B (en) | Grid-connected current balance control system of three-phase cascade photovoltaic inverter | |
| CN104638939B (en) | A kind of control method for suppressing the vibration of matrix converter input side | |
| CN109687745A (en) | A kind of single-phase inverter control method | |
| CN104410093A (en) | Charge state control method of energy storage battery | |
| CN204613263U (en) | Based on the current disturbing generator of accurate ratio resonance frequency dividing control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160615 |