CN103457286A - Grid-connected inverter control method for eliminating specific frequency energy fluctuation - Google Patents

Grid-connected inverter control method for eliminating specific frequency energy fluctuation Download PDF

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CN103457286A
CN103457286A CN2012101820757A CN201210182075A CN103457286A CN 103457286 A CN103457286 A CN 103457286A CN 2012101820757 A CN2012101820757 A CN 2012101820757A CN 201210182075 A CN201210182075 A CN 201210182075A CN 103457286 A CN103457286 A CN 103457286A
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grid
power
stop filter
band stop
resonance
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CN103457286B (en
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贾利民
刘展
雷涛
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Beijing nenggaopukang measurement and Control Technology Co.,Ltd.
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BEIJING NEGO AUTOMATION TECHNOLOGY Co Ltd
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Abstract

The invention discloses a grid-connected inverter control method for eliminating specific frequency energy fluctuation. The grid-connected inverter control method for eliminating the specific frequency energy fluctuation aims at the situations that a traditional grid-connected inverter control method connects direct current input power into a power grid directly and resonance oscillation of the power grid can be caused, optimizes a set value of grid-connected power by designing a band elimination filter, absorbs power signals which may cause the resonance oscillation of an electrical power system by using an intermediate direct current energy storage link of a grid-connected inverter, and enables the grid-connected power signals of the grid-connected inverter not to contain frequency domain components causing the resonance oscillation of the electrical power system, and therefore grid-connected power quality of the grid-connected inverter is improved effectively when input power fluctuates.

Description

A kind of control method of grid-connected inverter of eliminating the characteristic frequency energy hunting
Technical field
The invention belongs to field of power electronics, be specifically related to a kind of control method of grid-connected inverter of eliminating the characteristic frequency energy hunting.
Background technology
Combining inverter is a kind of power electronic equipment that direct current energy is converted into to the industrial frequency AC electric energy.Combining inverter is widely used in numerous distributed energy supply links such as wind power generation, photovoltaic generation at present.
During due to distributed energy supply, also network electric energy quality and the energy hunting situation of each electrical network access point all can exert an influence to the electrical network link, to cause the electrical network paralysis when serious, so the research of combining inverter control performance and improvement become the focus of field of power electronics research in recent years.
The method of maturation application is based on two closed loop Grid-connected Control Strategies of outer voltage current inner loop at present.This control method can guarantee the stable of combining inverter intermediate energy storage link direct voltage, be about to the DC side input power directly grid-connected in real time, but when the DC side input power of considering the combining inverter device may comprise some specific frequency domain components, after direct grid-connected, these specific frequency domain component signals may cause the resonance of electrical network link, cause power system oscillation.
Summary of the invention
In view of conventional voltage current double closed-loop grid-connected control method can not fully meet the stability of power system requirement, the present invention is in the situation that considered that there is fluctuation in combining inverter DC side input power, utilize the DC energy storage link to absorb the DC side input power signal of the corresponding frequency domain components that can cause electrical network resonance, thereby optimize real-time grid-connected power, make not comprise the frequency component that causes electrical network resonance in each frequency component of grid-connected power, thereby reduce distributed function due to the impact on stability of power system of the randomness of its grid-connected electric energy and fluctuation.
For achieving the above object, a kind of control method of grid-connected inverter of eliminating the characteristic frequency energy hunting of the present invention, its technical scheme is achieved in that
Calculate in real time the DC side input power, the DC side input power can be by detecting middle dc voltage as shown in Figure 1
Figure 50606DEST_PATH_IMAGE001
and input current
Figure 662984DEST_PATH_IMAGE002
realize the direct current input power
Figure 61735DEST_PATH_IMAGE003
can calculate according to the following formula:
Figure 426333DEST_PATH_IMAGE004
In formula
Figure 215428DEST_PATH_IMAGE005
mean the DC energy storage link voltage;
Figure 631497DEST_PATH_IMAGE006
mean the DC side input current.
Because combining inverter output filter inductance value is very little, be mainly used in reducing grid-connected high order harmonic component, therefore while working, the combining inverter power factor often is close to 1 simultaneously, can be similar to think grid-connected active power
Figure 212651DEST_PATH_IMAGE007
can calculate according to the following formula:
Figure 414395DEST_PATH_IMAGE008
In formula
Figure 81000DEST_PATH_IMAGE009
mean DC energy storage link charging and discharging currents;
In order to ensure not comprising the frequency domain components that causes electric power system resonance, grid-connected set value of the power in grid-connected power
Figure 97497DEST_PATH_IMAGE010
can be calculated according to following transfer function mode:
Figure 470841DEST_PATH_IMAGE011
In formula
Figure 914592DEST_PATH_IMAGE012
for band stop filter, mainly pass through
Figure 68492DEST_PATH_IMAGE012
cause the frequency domain components of electric power system resonance in the grid-connected power of filtering.
Grid-connected active current set point can be expressed as:
Figure 823434DEST_PATH_IMAGE013
In formula
Figure 113601DEST_PATH_IMAGE014
the electric network active voltage that means Real-Time Monitoring.
The grid-connected current control strategy, as shown in Figure 2, the reference value of q axle active current is concrete principle
Figure 931516DEST_PATH_IMAGE015
, d axle reactive current reference value
Figure 307133DEST_PATH_IMAGE016
usually be made as 0, under the dq coordinate system of current inner loop employing q axle orientation, the current feed-forward decoupling zero is controlled, and finally generates the control voltage of inverter q axle and d axle , through the PWM modulation, obtain the pwm pulse of trigger switch pipe, thereby the voltage of control inverter AC responds fast.
The essence of this method is to absorb the power signal that may cause electric power system resonance by combining inverter intermediate dc energy storage link, make the grid-connected power signal of combining inverter not comprise the frequency domain components that causes electric power system resonance, effectively reduce the situation that causes stability of power system to descend due to the grid-connected power fluctuation of distributed power generation energy supplying system.
The accompanying drawing explanation
Fig. 1 combining inverter schematic diagram.
Fig. 2 combining inverter current control loop schematic diagram
Embodiment
Calculate grid-connected set value of the power the time, for electric power system, may there is the situation of a plurality of resonance frequencys, band stop filter simultaneously
Figure 365634DEST_PATH_IMAGE019
can be designed in such a way:
Band stop filter can be designed as the series connection of second order Butterworth band stop filter:
In formula
Figure 262976DEST_PATH_IMAGE021
mean system resonance frequency number, for positive integer;
Figure 625135DEST_PATH_IMAGE023
mean electric power system the individual resonance frequency;
mean that grid-connected power causes electric power system the harmonic multiples of individual resonance frequency resonance;
Figure 202297DEST_PATH_IMAGE026
expression is for
Figure 977486DEST_PATH_IMAGE024
the passband gain of the band stop filter of individual resonance frequency design;
expression is for
Figure 455052DEST_PATH_IMAGE024
the logical quality factor of the band stop filter of individual resonance frequency design;
Figure 15959DEST_PATH_IMAGE028
expression is for
Figure 278444DEST_PATH_IMAGE024
the band stop filter transfer function of individual resonance frequency design.
Band stop filter can be any type of band stop filter except being designed to Butterworth band stop filter form, and this part only provides the design example of Butterworth band stop filter.
In working control, grid-connected set value of the power
Figure 320349DEST_PATH_IMAGE029
discrete control sequence solve can be by continuous band resistance filter transfer function
Figure 414207DEST_PATH_IMAGE030
according to after the discrete sampling period discrete, according to the discrete differential Equation Iterative, solve.
Continuous band resistance filter transfer function
Figure 777974DEST_PATH_IMAGE030
discrete transfer function can be expressed as usually:
Figure 698394DEST_PATH_IMAGE031
In formula
Figure 738463DEST_PATH_IMAGE032
mean the discrete transfer function order,
Figure 624511DEST_PATH_IMAGE033
for positive integer, and usually
Figure 530150DEST_PATH_IMAGE034
;
Figure 563965DEST_PATH_IMAGE035
mean band stop filter discrete transfer function molecule multinomial coefficient,
Figure 823039DEST_PATH_IMAGE036
for real number;
Figure 763926DEST_PATH_IMAGE037
mean band stop filter discrete transfer function denominator multinomial coefficient,
Figure 840466DEST_PATH_IMAGE038
for real number;
The iteration recurrence equation can be expressed as
Figure 299261DEST_PATH_IMAGE039
。
The intermediate dc energy storage link of combining inverter can be traditional capacitive form, also can be designed to according to designing requirement the electric energy storage links such as super capacitor, storage battery.

Claims (6)

1. a control method of grid-connected inverter of eliminating the characteristic frequency energy hunting, it is characterized in that the method utilizes the DC energy storage link to absorb the frequency domain components that causes electrical network resonance in the direct current input power, make the grid-connected power signal of combining inverter not comprise the frequency domain components that causes electric power system resonance, effectively reduce the situation that causes stability of power system to descend due to the grid-connected power fluctuation of distributed power generation energy supplying system.
2. a kind of control method of grid-connected inverter of eliminating the characteristic frequency energy hunting according to claim 1, it is characterized in that in control algolithm needing to calculate in real time the DC side input power, the DC side input power can be by detecting middle dc voltage as shown in Figure 1 and input current
Figure 2012101820757100001DEST_PATH_IMAGE002
realize the direct current input power
Figure 2012101820757100001DEST_PATH_IMAGE003
can calculate according to the following formula:
Figure 392742DEST_PATH_IMAGE004
In formula
Figure DEST_PATH_IMAGE005
mean the DC energy storage link voltage;
Figure 935981DEST_PATH_IMAGE006
mean the DC side input current.
3. a kind of control method of grid-connected inverter of eliminating the characteristic frequency energy hunting according to claim 1, is characterized in that grid-connected set value of the power
Figure DEST_PATH_IMAGE007
can be calculated according to following transfer function mode:
Figure 778035DEST_PATH_IMAGE008
In formula
Figure DEST_PATH_IMAGE009
for band stop filter, mainly pass through
Figure 796414DEST_PATH_IMAGE010
cause the frequency domain components of electric power system resonance in the grid-connected power of filtering.
4. a kind of control method of grid-connected inverter of eliminating the characteristic frequency energy hunting according to claim 1 is characterized in that grid-connected active current set point can be expressed as:
In formula
Figure 423835DEST_PATH_IMAGE012
the electric network active voltage that means Real-Time Monitoring.
5. a kind of control method of grid-connected inverter of eliminating the characteristic frequency energy hunting according to claim 1, is characterized in that the grid-connected current control principle as shown in Figure 2, and wherein the reference value of q axle active current is
Figure 183981DEST_PATH_IMAGE014
, d axle reactive current reference value
Figure 637965DEST_PATH_IMAGE016
usually be made as 0, under the dq coordinate system of current inner loop employing q axle orientation, the current feed-forward decoupling zero is controlled, and finally generates the control voltage of current transformer q axle and d axle
Figure 774548DEST_PATH_IMAGE018
, through the PWM modulation, obtain the pwm pulse of trigger switch pipe, thereby the voltage of control inverter AC responds fast.
6. band stop filter method for designing according to claim 3, is characterized in that calculating grid-connected set value of the power the time, for electric power system, may there is the situation of a plurality of resonance frequencys, band stop filter simultaneously
Figure 252770DEST_PATH_IMAGE022
can be designed in such a way:
When band stop filter can be designed as second order Butterworth band stop filter series connection form:
Figure 944782DEST_PATH_IMAGE024
In formula
Figure 307893DEST_PATH_IMAGE026
mean electric power system the resonance frequency;
Figure 2012101820757100001DEST_PATH_IMAGE028
mean that grid-connected power causes the harmonic multiples of electric power system the resonance frequency resonance;
Figure 2012101820757100001DEST_PATH_IMAGE030
expression is for the passband gain of the band stop filter of the resonance frequency design;
Figure 2012101820757100001DEST_PATH_IMAGE032
expression is for the logical quality factor of the band stop filter of the resonance frequency design;
Figure 2012101820757100001DEST_PATH_IMAGE034
show the band stop filter transfer function for the design of the resonance frequency;
Band stop filter can be any type of band stop filter except being designed to Butterworth band stop filter form.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104184352A (en) * 2014-09-17 2014-12-03 阳光电源股份有限公司 Inverter control method and system
CN111342465A (en) * 2020-03-03 2020-06-26 西南交通大学 Virtual filter design method for actively suppressing frequency fluctuation of power system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07175540A (en) * 1993-12-17 1995-07-14 Tohoku Electric Power Co Inc Deltav control system of voltage variation suppressing device
CN102290820A (en) * 2011-08-22 2011-12-21 中国矿业大学 LCL (Lower Control Unit) filtering controlled rectifying active damping control method of electric currents on feedback variable current side

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07175540A (en) * 1993-12-17 1995-07-14 Tohoku Electric Power Co Inc Deltav control system of voltage variation suppressing device
CN102290820A (en) * 2011-08-22 2011-12-21 中国矿业大学 LCL (Lower Control Unit) filtering controlled rectifying active damping control method of electric currents on feedback variable current side

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
席静芳: "有源滤波器的设计", 《上海第二工业大学学报》 *
杨淑英等: "LCL滤波电压源并网逆变器多环控制策略设计", 《电力系统自动化》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104184352A (en) * 2014-09-17 2014-12-03 阳光电源股份有限公司 Inverter control method and system
CN111342465A (en) * 2020-03-03 2020-06-26 西南交通大学 Virtual filter design method for actively suppressing frequency fluctuation of power system
CN111342465B (en) * 2020-03-03 2022-04-26 西南交通大学 Virtual filter design method for actively suppressing frequency fluctuation of power system

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