CN117254704B - Grid-connected voltage type rectifier frequency division analog resistance control method under unbalanced power grid - Google Patents
Grid-connected voltage type rectifier frequency division analog resistance control method under unbalanced power grid Download PDFInfo
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- CN117254704B CN117254704B CN202311231999.6A CN202311231999A CN117254704B CN 117254704 B CN117254704 B CN 117254704B CN 202311231999 A CN202311231999 A CN 202311231999A CN 117254704 B CN117254704 B CN 117254704B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Rectifiers (AREA)
Abstract
The control method of the frequency division analog resistor of the grid-connected voltage type rectifier under the unbalanced power grid comprises the steps of firstly, obtaining a power grid current signal and a direct current bus voltage signal under a two-phase static coordinate system. And secondly, according to the idea of frequency division control, respectively extracting a direct current component and a frequency doubling component of the direct current bus voltage based on a notch filter and a band-pass filter. Then, the direct-current voltage control ring is designed to regulate and control the direct-current component of the direct-current bus voltage, and the pulsating voltage control ring is designed to inhibit the frequency doubling component of the direct-current bus voltage caused by the unbalanced power grid. And finally, based on the idea of analog resistance control, calculating by utilizing the output of the two voltage controllers and the sampled power grid current signal, filtering by a band-pass filter to obtain a voltage reference at the alternating current side of the rectifier, and generating a pulse signal for controlling the switching tube of the rectifier to be conducted according to a carrier modulation method. The method is completely realized under a static coordinate system, and accurate line parameters, a power grid voltage sensor and a complex phase-locked loop algorithm are not needed.
Description
Technical Field
The invention relates to the field of frequency division analog resistance control of rectifiers, in particular to a frequency division analog resistance control method of a grid-connected voltage type rectifier under an unbalanced power grid.
Background
Three-phase voltage type rectifiers have been widely used as interfaces for power grids and distributed generation systems, storage systems and transmission systems, due to advantages of controllability and flexibility. However, when connected to an unbalanced grid (unbalanced voltage amplitude, phase imbalance, asymmetric input impedance, etc.), the performance of the grid-tied voltage type rectifier will deteriorate dramatically, inducing dc bus voltage ripple and ac side third harmonic current at twice the grid frequency. Therefore, it is of great importance to study the high-performance control strategy of the three-phase grid-connected rectifier under the unbalanced grid voltage condition to reduce the negative influence of the unbalanced grid voltage. Control schemes under unbalanced power networks for voltage-type rectifiers have been proposed in great numbers, with sensorless control having received great attention due to cost savings and improved reliability. The most common approach is to design a grid voltage observer. The leberg state observer, kalman filter-based observer and virtual flux linkage-based observer have been widely studied and proved to be effective. But these methods all suffer from parameter uncertainty. In recent years, analog resistance control has become a very promising method for controlling grid-connected converters due to the characteristics of no sensor and easy implementation. Although the control thought is expanded to the three-phase voltage type rectifier under the unbalanced power network by the prior scholars, the control structure is complex, and certain implementation difficulty exists. Therefore, it is of great practical importance to develop a simple but effective sensorless control strategy.
Disclosure of Invention
In order to solve the technical problems, the invention provides a frequency division analog resistance control method of a grid-connected voltage type rectifier under an unbalanced power grid, which combines the idea of frequency division control with an analog resistance control technology to achieve the aims of constant direct current bus voltage and sine input current of a three-phase voltage type rectifier under the working condition of the unbalanced power grid.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The frequency division analog resistance control method of the grid-connected voltage type rectifier under the unbalanced power grid comprises the following steps of:
s1, acquiring a current signal of an alternating current side and a voltage signal of a direct current side of a three-phase voltage type rectifier under a two-phase static coordinate system;
S2, respectively extracting a direct current component and a frequency doubling component of the direct current bus voltage based on a notch filter and a band-pass filter according to the idea of frequency division control;
s3, designing a direct-current voltage control loop to regulate and control direct-current components of the direct-current bus voltage, and designing a pulsating voltage control loop to inhibit double frequency components of the direct-current bus voltage caused by an unbalanced power grid;
And S4, based on the thought of analog resistance control, calculating by utilizing the output of the two voltage controllers and the sampled power grid current signal, filtering by a band-pass filter to obtain a voltage reference at the alternating current side of the rectifier, and generating a pulse signal for controlling the switching tube of the rectifier to be conducted according to a carrier modulation method.
As a further improvement of the present invention, the specific process of voltage division control in step S2 is as follows:
The sampled dc bus voltage signal is divided using a filter. The notch filter is used for extracting a direct current component u dc0 of the direct current bus voltage u dc, and the band-pass filter is used for extracting a frequency doubling component u dc2 of the direct current voltage.
Where s denotes the laplace operator, ω s is the angular frequency of the grid, and ζ 2 are the damping factors of the notch filter G Notch(s) and the band pass filter G BPF2(s), respectively.
As a further improvement of the present invention, the specific processes of the dc voltage control loop and the pulsating voltage control loop in the step S3 are as follows:
The error of the direct current component u dc0 of the direct current bus voltage and the direct current voltage reference value u dc * is used as the input of the direct current voltage control loop proportional-integral PI controller to realize that the direct current component u dc0 has no static difference to track the reference value, and the error of the frequency doubling component and the reference value 0 is used as the input of the pulse voltage loop proportional-resonance PR controller to restrain the frequency doubling pulse voltage.
The design of the direct current voltage control loop is as follows:
the design of the ripple voltage controller is as follows:
Re2＝PR(s)(0-udc2) (4)
wherein,
K p0,ki0 represents the proportional and integral gains of the PI controller, respectively, k p2,kr2 represents the proportional and resonant gains of the PR controller, respectively, and R * is a feed-forward constant term greater than 0.
As a further development of the invention, the voltage reference calculation on the ac side of the rectifier described in S4 is specifically as follows:
S4.1, based on the idea of analog resistance control, multiplying the output R e0、Re2 of the two voltage controllers with a sampled grid current signal i α,iβ under a two-phase static coordinate system to obtain i αβRe0 and i αβRe2, screening out a fundamental frequency component from i αβRe2 by a band-pass filter, and then differencing with i αβRe0 to obtain a voltage reference on the alternating current side of the rectifier, wherein the calculation expression of the voltage reference u cαβ * is as follows:
wherein,
Ζ 1 is the damping factor of G BPF1(s);
The center frequency of the band-pass filter G BPF1(s) in the above formula is omega s, which is used for filtering the third harmonic component in i αβRe2;
and S4.2, generating driving signals of six switching tubes of the rectifier by using a carrier modulation method according to the command voltage value of the alternating current side of the rectifier.
The innovation points of the invention are as follows:
1) The frequency division analog resistance control method of the grid-connected voltage type rectifier under the unbalanced power grid is completely realized based on a static coordinate system, a grid-side voltage sensor, accurate line parameters and a complex phase-locked loop algorithm are not needed, and the method has the advantages of simplicity in realization, low cost and strong robustness.
2) The control method only uses a Proportional Integral (PI) controller, a Proportional Resonance (PR) controller, a notch filter and three band-pass filters, so that direct-current bus voltage pulsation of the three-phase rectifier under an unbalanced power grid is simply and effectively restrained, and current harmonic waves at the grid side are reduced.
Drawings
FIG. 1 is a flowchart of the control algorithm of an embodiment of the present invention;
FIG. 2 is a block diagram of a control system according to an embodiment of the present invention;
FIG. 3 is a general control block diagram of a control method according to an embodiment of the present invention;
FIG. 4 is a waveform diagram of input voltage and input current of a simulation experiment power grid and a harmonic analysis diagram of a phase current at an input side by a frequency division simulation resistance control method of a grid-connected voltage type rectifier under an unbalanced power grid in an embodiment of the invention;
Fig. 5 is a dynamic response diagram of a step change of a voltage of a direct current bus in a simulation experiment of a frequency division analog resistance control method of a grid-connected voltage type rectifier under an unbalanced power grid.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and detailed description:
Fig. 1 is a working flow chart of a frequency division simulation resistance control method of a grid-connected voltage type rectifier under an unbalanced power network. Fig. 2 is a block diagram of a control system of a frequency division analog resistance control method of a grid-connected voltage type rectifier under an unbalanced power supply of the present invention, in which a main circuit includes a voltage type rectifier 1 to be implemented according to the present invention; the control circuit part is a sampling circuit 2, a controller 3 and a driving circuit 4. The left sampling circuit of the sampling circuit 2 is responsible for sampling and conditioning the grid current, and the right sampling circuit is used for sampling the direct current bus voltage. The controller 3 is responsible for the operations such as modulation and control, and transmits the generated PWM switching pulse signal to the driving circuit 4 to control the operation of each switching tube.
Fig. 3 is a general control block diagram of a frequency division analog resistance control method of a grid-connected voltage type rectifier under an unbalanced power grid, which is used for acquiring a power grid current i abc and a direct current bus voltage u dc, acquiring a direct current component of the direct current bus voltage by adopting a trap, and acquiring a double power grid frequency component of the direct current bus voltage by adopting a band-pass filter. According to the frequency division concept, the direct current bus voltage control loop is divided into a direct current voltage control loop and a pulsating voltage control loop. The error of the DC component of the DC bus voltage and the DC voltage reference value is used as the input of the DC voltage control loop PI controller, and the error of the frequency doubling component and the reference value 0 is used as the input of the pulse voltage loop PR controller. The output of the two controllers is multiplied by the grid current under the two-phase static coordinate system and then subtracted to obtain the alternating-current side voltage reference value u cα *,ucβ * under the two-phase static coordinate system of the rectifier.
Fig. 4 is a waveform diagram of the input side of the grid in a simulation experiment of the frequency division simulation resistance control method of the grid-connected voltage type rectifier under an unbalanced power grid, fig. 4 (a) is a waveform diagram of the voltage simulation of the unbalanced power grid, the three-phase voltage is in an unbalanced state, the phase and the amplitude of the voltage of the power grid are both asymmetric (u sa＝99V,usb＝88V,usc =110v,). Fig. 4 (b) is a simulation waveform of the current of the power grid, fig. 4 (c) is harmonic analysis of the a-phase current of the power grid, and as can be seen from the graph, the input current of the power grid is basically sinusoidal, the total harmonic distortion rate of the a-phase input current is 3.33%, and the feasibility of the proposed control method is verified.
Fig. 5 is a waveform diagram of a given voltage step response in a simulation experiment of a frequency division simulation resistance control method of a grid-connected voltage type rectifier under an unbalanced power grid. Wherein the dc link voltage reference varies from 300V to 350V. The transient response is within 20ms, indicating that the proposed control has good dynamic performance.
The above description is only of the preferred embodiment of the present invention, and is not intended to limit the present invention in any other way, but is intended to cover any modifications or equivalent variations according to the technical spirit of the present invention, which fall within the scope of the present invention as defined by the appended claims.
Claims (1)
1. The frequency division analog resistance control method of the grid-connected voltage type rectifier under the unbalanced power grid comprises the following steps of:
s1, acquiring a current signal of an alternating current side and a voltage signal of a direct current side of a three-phase voltage type rectifier under a two-phase static coordinate system;
s2, respectively extracting a direct current component and a frequency doubling component of the direct current bus voltage based on a notch filter and a first band-pass filter according to the idea of frequency division control;
the specific process of voltage frequency division control described in step S2 is as follows:
dividing the frequency of the sampled DC bus voltage signal by using a filter, wherein a notch filter is used for extracting a DC component u dc0 of the DC bus voltage u dc, and a first band pass filter is used for extracting a double frequency component u dc2 of the DC voltage;
where s represents the laplace operator, ω s is the angular frequency of the grid, ζ and ζ 2 are the damping factors of the notch filter G Notch(s) and the first band pass filter G BPF2(s), respectively;
s3, designing a direct-current voltage control loop to regulate and control direct-current components of the direct-current bus voltage, and designing a pulsating voltage control loop to inhibit double frequency components of the direct-current bus voltage caused by an unbalanced power grid;
the specific processes of the direct-current voltage control loop and the pulsating voltage control loop in the step S3 are as follows:
An error of a direct current component u dc0 of the direct current bus voltage and a direct current voltage reference value u dc * is used as an input of a direct current voltage control loop proportional-integral PI controller to realize that the direct current component u dc0 has no static difference to track a reference value thereof, and an error of a frequency doubling component and a reference value 0 thereof is used as an input of a pulse voltage loop proportional-resonant PR controller to inhibit frequency doubling pulse voltage;
The design of the direct current voltage control loop is as follows:
the design of the ripple voltage controller is as follows:
Re2＝PR(s)(0-udc2) (4)
wherein,
K p0,ki0 represents the proportional and integral gains of the PI controller, k p2,kr2 represents the proportional and resonant gains of the PR controller, respectively, and R * is a feed-forward constant term greater than 0;
S4, based on the thought of analog resistance control, calculating by utilizing the output of the two voltage controllers and the sampled power grid current signal, filtering by a second band-pass filter to obtain a voltage reference at the alternating current side of the rectifier, and generating a pulse signal for controlling the switching tube of the rectifier to be conducted according to a carrier modulation method;
the voltage reference calculation on the ac side of the rectifier described in S4 is specifically as follows:
S4.1, based on the idea of analog resistance control, multiplying the output R e0、Re2 of the two voltage controllers with a sampled grid current signal i α,iβ under a two-phase static coordinate system to obtain i αβRe0 and i αβRe2, screening out a fundamental frequency component from i αβRe2 through a second band-pass filter, and then performing difference with i αβRe0 to obtain a voltage reference on the alternating current side of the rectifier, wherein the calculation expression of the voltage reference u cαβ * is as follows:
wherein,
Ζ 1 is the damping factor of G BPF1(s);
The center frequency of the second band-pass filter G BPF1(s) in the above formula is ω s, which is used to filter out the third harmonic component in i αβRe2;
and S4.2, generating driving signals of six switching tubes of the rectifier by using a carrier modulation method according to the command voltage value of the alternating current side of the rectifier.
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