CN110212578B - Control method for current source converter of voltage sensor without power grid - Google Patents
Control method for current source converter of voltage sensor without power grid Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a control method of a current source converter of a voltage sensor without a power grid, which is realized under an abc coordinate system, estimates the voltage through parameter calculation and comprises the following steps: the method comprises the following steps of calculating a first parameter, a second parameter, a third parameter, a fourth parameter, a fifth parameter, a sixth parameter, a seventh parameter, an eighth parameter, an a phase voltage estimated value, a b phase voltage estimated value and a c phase voltage estimated value, and then generating a reference current through calculation, wherein the method comprises the following steps: the reference value of the phase a current, the reference value of the phase b current and the reference value of the phase c current are used for achieving the purpose of current closed-loop control. The control method of the invention has simple structure of the switch signal generating circuit and can be realized by adopting a digital control circuit.
Description
Technical Field
The invention relates to the technical field of power electronic conversion, in particular to a control method of a grid-free voltage sensor current source converter.
Background
With the rapid development of power electronic technology, current source converters are receiving more and more attention from the industry and academia in the fields of solid-state transformer systems, uninterruptible power supply systems, multi-electric aircraft power systems, photovoltaic power generation systems, wind power generation systems, high-voltage direct-current power transmission systems, flexible alternating-current power transmission systems and the like. When the current source converter is in grid-connected operation, the current source converter is influenced by the operation condition of a power grid, and necessary control is required to ensure stable operation of the system. For example, under the condition of harmonic waves and unbalance in the power grid voltage, negative sequence components and low-order harmonic waves occur in the grid-side current at the same time, and the system operation is influenced. The current solutions are mainly divided into two main categories: one is a rotating coordinate system based control strategy, such as dual rotating coordinate system control and single rotating coordinate system control. The second type is a control strategy based on a static coordinate system, and is characterized in that rotary coordinate transformation is not needed, but a phase-locked loop is needed for calculating positive sequence and negative sequence components of the power grid voltage, a voltage sensor is needed, and meanwhile, the control structure is complex. Therefore, a sensorless current source converter control method is needed.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide a method for controlling a grid-less voltage sensor current source converter.
In order to realize the purpose, the invention is realized according to the following technical scheme:
a control method for a grid-free voltage sensor current source converter is characterized by comprising the following steps:
step S1: obtaining a-phase grid current I using a current sensoraB-phase grid current IbC-phase grid current Ic；
Step S2: according to equation 1:
obtaining an estimated value U of a phase voltagega；
According to equation 2:
obtaining an estimated b-phase voltage value Ugb；
According to equation 3:
obtaining estimated value U of c-phase voltagegc，
Wherein m isaIs the first parameter, i.e. the output of the complex integral controller is subtracted from the output of the first proportional complex integral controller, mbIs the second parameter, i.e. the output of the second proportional-complex integral controller minus the output of the complex integral controller, mcIs the third parameter, i.e. the output of the third proportional-complex integral controller minus the output of the complex integral controller, IdIs a fourth parameter, i.e. the DC side current value, and L is a fifth parameter, i.e. the AC side inductance value; c is a sixth parameter, namely the capacitance value of the alternating current side; omega0The seventh parameter is the grid voltage fundamental wave angular frequency 2 pi f, and f is 50Hz which is the fundamental wave frequency; u shapegaAs an estimate of the a-phase voltage, UgbAs an estimate of the b-phase voltage，UgcAs an estimate of the c-phase voltage, IaIs a phase current value, IbB phase current value, IcIs the c-phase current value;
step S3: setting an active power reference value P*Is set as the eighth parameter, and the estimated value U of the a-phase voltage is setgaB-phase voltage estimated value UgbC-phase voltage estimation value UgcActive power reference value P*Substituting into equation 4:
obtaining a phase a current reference value
Estimating a-phase voltage UgaB-phase voltage estimated value UgbC-phase voltage estimation value UgcActive power reference value P*Substituting into equation 5:
obtaining a b-phase current reference value
Estimating a-phase voltage UgaB-phase voltage estimated value UgbC-phase voltage estimation value UgcActive power reference value P*Substituting into equation 6:
obtaining c-phase current reference value
Wherein,
is a wave trap, where xi is a damping coefficient, ωnFor the notch frequency, reducing the double frequency component in each phase of reference current;
step S4: reference value of a-phase current
Subtracting the a-phase current value IaObtaining an a-phase error value as an input of a first proportional complex integral controller, wherein the first parameter m is obtained by subtracting the output of the complex integral controller from the output of the first proportional complex integral controllera；
Reference value of b-phase current
Subtracting the b-phase current value IbObtaining a b-phase error value as an input of a second proportional complex integral controller, and subtracting the output of the complex integral controller from the output of the second proportional complex integral controller to obtain a second parameter mb；
Reference value of c-phase current
Subtracting the c-phase current value IcObtaining a c-phase error value as an input of a third proportional-complex integral controller, subtracting the output of the complex integral controller from the output of the third proportional-complex integral controller to obtain a third parameter mc；
Wherein the transfer function of the first, second and third proportional-complex-integral controllers is
Wherein k ispCoefficient of proportionality, kiAs integral coefficient, ω0Grid voltage fundamental angular frequency;
the transfer function of the complex integral controller is
Wherein k isiAs integral coefficient, ω0The fundamental wave angular frequency of the grid voltage, n is a specific harmonic frequency;
step S5: the first parameter maA second parameter mbA third parameter mcAs modulation wave input to the drive signal generator to generate drive signalThe switching tube is driven.
In the above technical solution, the step S4 specifically includes:
step S401: the method comprises the steps that a phase current value is used as the input of an Nth complex integral controller, the Nth complex integral controller correspondingly reduces specific times of harmonic waves in a phase power grid current, and the first proportional complex integral controller subtracts the output of the Nth complex integral controller to obtain a first parameter ma；
Step S402: the b-phase power grid current value is used as the input of an Nth complex integral controller, the Nth complex integral controller correspondingly reduces specific times of harmonic waves in the b-phase power grid current, and the first proportional complex integral controller subtracts the output of the Nth complex integral controller to obtain a second parameter mb；
Step S403, the current value of the c-phase power grid is used as the input of an Nth complex integral controller, the Nth complex integral controller correspondingly reduces specific times of harmonic waves in the current of the c-phase power grid, and the output of the Nth complex integral controller is subtracted by the first proportional complex integral controller to obtain a third parameter mcWherein N is a positive integer.
Compared with the prior art, the invention has the following advantages:
the control method of the invention does not need phase locking and a power grid voltage sensor, and simultaneously realizes the static-error-free control of the power grid current. The control method is simple and easy to realize in the abc coordinate system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a current source converter;
FIG. 2 is a schematic diagram of the control method of the present invention;
FIG. 3 is a schematic diagram of the voltage estimation process, reference current generation, of the present invention;
FIG. 4 is a schematic diagram of the generation of the first parameter, the second parameter, the third parameter and the specific harmonic suppression of the reference current according to the control method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
As shown in fig. 1, a method for controlling a grid-less voltage sensor current source converter according to the present application includes: fourth parameter IdA fifth parameter L and a sixth parameter C, a phase current value IaB-phase current value IbC phase current value IcWherein L is L1＝L2＝L3、C＝C1＝C2＝C3。
Large inductance L on DC side4、L5Instead of a current source, through a large inductance L4、L5Current of the fourth parameter Id。
Referring to FIG. 2, the current value of phase a in the present application is shownaB-phase current value IbC phase current value IcCan be obtained by current sensor, and the second parameter m is obtainedbA third parameter mcB-phase current value IbC phase current value IcGrid voltage fundamental angular frequency omega0Substituting formula 1:
According to fig. 3, the reference value of the a-phase current minus the a-phase current is used as the input of the first proportional complex integral controller, the a-phase current is used as the input of the complex integral controller, and the output of the first proportional complex integral controller minus the output of the complex integral controller is used to obtain the first parameter maDetermining a complex integral controller according to the harmonic frequency to be reduced in the phase-a current; subtracting the b-phase current value from the b-phase current reference value to obtain a second parameter m, wherein the b-phase current value is used as the input of a second proportional-complex-integral controller, the b-phase current value is used as the input of a complex-integral controller, and the output of the second proportional-complex-integral controller is subtracted from the output of the complex-integral controller to obtain a second parameter mbDetermining a complex integral controller according to the harmonic frequency to be reduced in the phase-b current; subtracting the c-phase current value from the c-phase current reference value to obtain a third parameter m, wherein the c-phase current value is used as the input of a third proportional-integral controller, the c-phase current value is used as the input of a complex integral controller, and the output of the third proportional-integral controller is subtracted from the output of the complex integral controller to obtain a third parameter mcDetermining a complex integral controller according to the harmonic frequency to be reduced in the phase-b current; wherein the transfer function of the proportional-complex-integral controller is
Wherein k ispCoefficient of proportionality, kiAs integral coefficient, ω0Grid voltage fundamental angular frequency; the transfer function of the complex integral controller is
Where n is a specific harmonic order.
Furthermore, a first parameter maA second parameter mbA third parameter mcThe driving signal generated by the driving signal generator is input to the switching tube S of the current source converter1、S2、S3、S4、S5、S6The invention can use space vector pulse width modulation SVPWM to generate drive signals, and can also use sine pulse width modulation SPWM to generate drive signalsThe SVPWM generates a driving signal, the control is simple, and the digital realization is easy.
In summary, the present invention provides a method for controlling a current source converter of a grid-less voltage sensor, comprising a first parameter maA second parameter mbA third parameter mcA fourth parameter IdA fifth parameter L, a sixth parameter C, a seventh parameter omega0The eighth parameter P*A phase voltage estimated value UgaB-phase voltage estimated value UgbC-phase voltage estimation value UgcReference value of phase a current
Reference value of b-phase current
c-phase current reference value
This application need not the lock phase, need not electric wire netting voltage sensor, can reduce the system volume greatly, reduces system cost, and easily control realizes, in addition, in this application, uses proportional complex number integral controller to electric wire netting current control, can realize electric wire netting current's no static adjustment. In addition, a complex integral controller is added to reduce specific order harmonics in the power grid current, and a trap is used to reduce the frequency doubling component in the reference current. When the voltage of the power grid contains harmonic waves and the current of the power grid is unbalanced, the control method provided by the invention can be used for achieving an ideal control target.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (2)
1. A control method for a grid-free voltage sensor current source converter is characterized by comprising the following steps:
step S1: obtaining a-phase grid current I using a current sensoraB-phase grid current IbC-phase grid current Ic；
Step S2: according to equation 1:
obtaining an estimated value U of a phase voltagega；
According to equation 2:
obtaining an estimated b-phase voltage value Ugb；
According to equation 3:
obtaining estimated value U of c-phase voltagegc，
Wherein m isaIs the first parameter, i.e. the output of the complex integral controller is subtracted from the output of the first proportional complex integral controller, mbIs the second parameter, i.e. the output of the second proportional-complex integral controller minus the output of the complex integral controller, mcIs the third parameter, i.e. the output of the third proportional-complex integral controller minus the output of the complex integral controller, IdIs a fourth parameter, i.e. the DC side current value, and L is a fifth parameter, i.e. the AC side inductance value; c is a sixth parameter, namely the capacitance value of the alternating current side; omega0The seventh parameter is the grid voltage fundamental wave angular frequency 2 pi f, and f is 50Hz which is the fundamental wave frequency; u shapegaAs an estimate of the a-phase voltage, UgbAs an estimate of the b-phase voltage, UgcAs an estimate of the c-phase voltage, IaIs a phase current value, IbB phase current value, IcIs the c-phase current value;
step S3: setting an active power reference value P*Is set as the eighth parameter, and the estimated value U of the a-phase voltage is setgaB-phase voltage estimated value UgbC-phase voltage estimation value UgcActive power reference value P*Substituting into equation 4:
obtaining a phase a current reference value
Estimating a-phase voltage UgaB-phase voltage estimated value UgbC-phase voltage estimation value UgcActive power reference value P*Substituting into equation 5:
obtaining a b-phase current reference value
Estimating a-phase voltage UgaB-phase voltage estimated value UgbC-phase voltage estimation value UgcActive power reference value P*Substituting into equation 6:
obtaining c-phase current reference value
Wherein,
is a wave trap, where xi is a damping coefficient, ωnFor the notch frequency, reducing the double frequency component in each phase of reference current;
step S4: reference value of a-phase current
Subtracting the a-phase current value IaObtaining an a-phase error value as an input of a first proportional complex integral controller, wherein the first parameter m is obtained by subtracting the output of the complex integral controller from the output of the first proportional complex integral controllera；
Reference value of b-phase current
Subtracting the b-phase current value IbObtaining a b-phase error value as an input of a second proportional complex integral controller, and subtracting the output of the complex integral controller from the output of the second proportional complex integral controller to obtain a second parameter mb；
Reference value of c-phase current
Subtracting the c-phase current value IcObtaining a c-phase error value as an input of a third proportional-complex integral controller, subtracting the output of the complex integral controller from the output of the third proportional-complex integral controller to obtain a third parameter mc；
Wherein the transfer function of the first, second and third proportional-complex-integral controllers is
Wherein k ispCoefficient of proportionality, kiAs integral coefficient, ω0Grid voltage fundamental angular frequency;
the transfer function of the complex integral controller is
Wherein k isiAs integral coefficient, ω0The fundamental wave angular frequency of the grid voltage, n is a specific harmonic frequency;
step S5: the first parameter maA second parameter mbA third parameter mcThe modulation wave is input to a driving signal generator to generate a driving signal to drive the switching tube.
2. The control method according to claim 1, characterized in that: the step S4 specifically includes:
step S401: the a-th phase current value is used as the input of the Nth complex integral controllerThe complex integral controllers correspondingly reduce specific harmonic in a-phase power grid current, and the first proportional complex integral controller subtracts the output of the Nth complex integral controller to obtain a first parameter ma；
Step S402: the b-phase power grid current value is used as the input of an Nth complex integral controller, the Nth complex integral controller correspondingly reduces specific times of harmonic waves in the b-phase power grid current, and the first proportional complex integral controller subtracts the output of the Nth complex integral controller to obtain a second parameter mb；
Step S403, the current value of the c-phase power grid is used as the input of an Nth complex integral controller, the Nth complex integral controller correspondingly reduces specific times of harmonic waves in the current of the c-phase power grid, and the output of the Nth complex integral controller is subtracted by the first proportional complex integral controller to obtain a third parameter mcWherein N is a positive integer.
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