CN112510755A - Predicted phase delay compensation method and system of three-phase converter - Google Patents
Predicted phase delay compensation method and system of three-phase converter 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac 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
- H02M7/537—Conversion of dc power input into ac 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53873—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control
Abstract
The embodiment of the invention provides a method and a system for predicting phase compensation of a three-phase inverter, belonging to the technical field of parameter control of a power system. The method comprises the following steps: predicting output voltage u of converter bridge armαAnd uβ(ii) a Calculating the phase theta of the predicted voltage output by the bridge arm1And the phase theta of the reference voltage of SVPWM before compensation2The phase difference Δ θ between; determining compensation quantity of pulse width modulation delay according to the phase difference delta theta and the calculation delay of the sampling period of the three-phase converter; and correcting the predicted phase value of the three-phase converter according to the compensation amount. The method and the system can solve the technical problem that the decoupling effect of active current and reactive current is poor due to inaccurate compensation quantity of a power system in the prior art.
Description
Technical Field
The invention relates to the technical field of parameter control of an electric power system, in particular to a predicted phase delay compensation method and system of a three-phase converter.
Background
The converter under digital control usually has sampling calculation delay and pulse width modulation delay, wherein the sampling calculation delay is 1 sampling period, the pulse width modulation delay is about 0.5 sampling period, and the two delays are added together to approximate to the sampling period of 1.5 times of delay, namely, the current loop error regulator output can cause the coupling of active current and reactive current under a rotating coordinate system. In order to solve the technical problem, a compensation angle is directly given by a traditional delay compensation method, however, in the dynamic adjustment process of a current loop, although the sampling calculation delay is always 1 sampling period, the pulse width modulation delay can not be approximated by 0.5 sampling period in the dynamic adjustment process of the current loop, so that the compensation quantity of the traditional delay compensation method in the dynamic adjustment process is inaccurate, and the decoupling effect of active current and reactive current is reduced.
Disclosure of Invention
The invention aims to provide a method and a system for predicting phase delay compensation of a three-phase converter, and the method and the system can solve the technical problem that the decoupling effect of active current and reactive current is poor due to inaccurate compensation quantity of a power system in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a predicted phase delay compensation method for a three-phase converter, including:
predicting output voltage u of converter bridge armαAnd uβ；
Calculating the phase theta of the predicted voltage output by the bridge arm1And the phase theta of the reference voltage of SVPWM before compensation2The phase difference Δ θ between;
determining compensation quantity of pulse width modulation delay according to the phase difference delta theta and the calculation delay of the sampling period of the three-phase converter;
and correcting the predicted phase value of the three-phase converter according to the compensation amount.
Optionally, the output voltage u of the converter leg is predictedαAnd uβThe method specifically comprises the following steps:
determining a current reference i in an alpha beta coordinate system according to formula (1)α *And iβ *，
Wherein id *Is the active current in dq coordinate system, theta0The phase angle of the power grid voltage corresponding to the three-phase converter is obtained;
determining the output voltage u according to equation (2)α，
uα＝ua＝ea-sLagiα *+[iα *+(ea-sLagiα *)sCa]sLar， (2)
Wherein u isaIs the output voltage in the abc coordinate system, eaIs one phase of three-phase network voltage, s is Laplace operator, LagIs a grid side inductor, CaIs a filter capacitor, LarIs a converter side inductor;
determining the output voltage u according to equation (3)β，
Where xi is the system damping coefficient of the phase shift filter, omega0Is the grid angular frequency.
Optionally, the phase θ of the predicted voltage output by the bridge arm is calculated1And reference voltage phase theta of SVPWM before compensation2The phase difference Δ θ therebetween specifically includes:
calculating the phase theta according to equation (4)1，
According to the formula (5), the reference voltage u of the SVPWM generated under the dq coordinate system before compensationd *And uq *Converting into reference voltage u under alpha beta coordinate systemdq-αAnd udq-β，
Calculating the phase theta according to equation (6)2，
The phase difference delta theta is calculated according to equation (7),
Δθ＝θ1-θ2， (7)。
optionally, determining the compensation amount of the pulse width modulation delay according to the phase difference Δ θ and the calculation delay of the sampling period of the three-phase converter specifically includes:
the phase difference delta theta is converted according to equation (8),
calculating the compensation amount according to equation (9),
θFF′＝(Ts+Tpre)ω0＝Tsω0+Δθ， (9)
wherein, TsIs the sampling period.
In another aspect, the present invention also provides a system for predicting phase delay compensation of a three-phase converter, the system comprising a processor configured to:
predicting output voltage u of converter bridge armαAnd uβ；
Calculating the phase theta of the predicted voltage output by the bridge arm1And the phase theta of the reference voltage of SVPWM before compensation2The phase difference Δ θ between;
determining compensation quantity of pulse width modulation delay according to the phase difference delta theta and the calculation delay of the sampling period of the three-phase converter;
and correcting the predicted phase value of the three-phase converter according to the compensation amount.
Optionally, the processor is further configured to:
determining a current reference i in an alpha beta coordinate system according to formula (1)α *And iβ *，
Wherein id *Is the active current in dq coordinate system, theta0The phase angle of the power grid voltage corresponding to the three-phase converter is obtained;
determining the output voltage u according to equation (2)α，
uα＝ua＝ea-sLagiα *+[iα *+(ea-sLagiα *)sCa]sLar， (2)
Wherein u isaIs the output voltage in the abc coordinate system, eaIs one phase of three-phase network voltage, s is Laplace operator, LagIs a grid side inductor, CaIs a filter capacitor, LarIs a converter side inductor;
determining the output voltage u according to equation (3)β，
Where xi is the system damping coefficient of the phase shift filter, omega0Is the grid angular frequency.
Optionally, the processor is further configured to:
calculating the phase theta according to equation (4)1，
According to the formula (5), the reference voltage u of the SVPWM generated under the dq coordinate system before compensationd *And uq *Converting into reference voltage u under alpha beta coordinate systemdq-αAnd udq-β，
Calculating the phase theta according to equation (6)2，
The phase difference delta theta is calculated according to equation (7),
Δθ＝θ1-θ2， (7)。
optionally, the processor is further configured to:
the phase difference delta theta is converted according to equation (8),
calculating the compensation amount according to equation (9),
θFF′＝(Ts+Tpre)ω0＝Tsω0+Δθ， (9)
wherein, TsIs the sampling period.
In yet another aspect, the present invention also provides a storage medium storing instructions for reading by a machine to cause the machine to perform a method as claimed in any one of the above.
Through the technical scheme, the method and the system for predicting the phase delay compensation of the three-phase converter provided by the invention have the advantages that the compensation quantity of the pulse width modulation delay is accurately calculated, the technical problem of poor decoupling effect of active current and reactive current caused by inaccurate compensation quantity of an electric power system in the prior art is solved, and the control accuracy of the electric power system is improved.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a block diagram of a typical prior art three-phase converter control;
fig. 2 is a flowchart of a predicted phase delay compensation method of a three-phase current transformer according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
In the embodiments of the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, top, and bottom" is generally used with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, or gravitational direction.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the various embodiments can be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not be within the protection scope of the present invention.
Fig. 1 shows a control block diagram of a typical three-phase converter in the prior art. In fig. 1, the ac side of a grid-connected (three-phase) converter is connected to a three-phase grid. The grid voltage of the three-phase grid is ea、ebAnd ecThe alternating current is ia、ibAnd ic. The ac side filter of the converter is of the LCL type. L isar、LbrAnd LcrIs a side inductor of the converter, Lag、LbgAnd LcgIs a grid side inductor, Ca、CbAnd CcIs the filter capacitance ua、ubAnd ucFor the three-phase leg output voltage of the converter, theta0The phase angle of the power grid voltage can be obtained by a PLL phase locking link. i.e. idAnd iαRespectively an active current and a reactive current in a dq coordinate system. i.e. id *And iq *And the reference of active current and reactive current in a dq coordinate system. u. ofα *And uβ *Is a reference voltage u of SVPWM generated under the compensated alpha beta coordinate systemd *、ug *Is a reference voltage u of SVPWM generated under the compensated dq coordinate systemdAnd ugTo the reference voltage, θ, of the SVPWM generated in the dq coordinate system before compensationFFThe phase angle compensated for delay (fixed value in the prior art).
For a converter control block diagram as shown in fig. 1. In the prior art, when a three-phase converter under digital control is controlled, two parameters of a current system, namely sampling calculation delay and pulse width modulation delay, need to be acquired. In the prior art, the sampling computation delay is generally 1 cycle, while the pulse width modulation delay is generally 0.5 cycle, and the sum of the two is 1.5 cycles. Therefore, in order to realize accurate decoupling and control, a compensation amount of 1.5 cycles needs to be added to the actually acquired parameters in the actual dynamic adjustment process. However, for the condition that the reference of the converter is suddenly changed, the pulse width modulation delay is no longer 0.5 sampling period, and at this time, if the compensation quantity of the traditional 1.5 sampling period is continuously adopted, decoupling and control are obviously affected.
Therefore, the invention provides a method for compensating the predicted phase delay of a three-phase converter, and a flow chart of the method is shown in fig. 2. In fig. 2, the method may include:
in step S10, the output voltage u of the converter leg is predictedαAnd uβ. In this embodiment, since the three-phase current converter is usually operated in a rectifying or inverting state, the output voltage u is calculatedαAnd uβTime, reference current iq *May be 0. Therefore, the output voltage u is calculatedαAnd uβThen, the current reference i in the α β coordinate system can be determined according to equation (1)α *And iβ *，
Wherein id *Is the active current in dq coordinate system, theta0The phase angle of the corresponding grid voltage of the three-phase converter.
In the block diagram shown in fig. 1, since the abc coordinate system and the α β coordinate system are both stationary coordinate systems, and the a axis and the α axis coincide. Therefore, uα＝ua，iα *＝ia *. Accordingly, the output voltage uαIt can be derived from the parameters of the a-phase filter. Specifically, the output voltage u may be determined according to equation (2)α，
uα＝ua＝ea-sLagiα *+[iα *+(ea-sLagiα *)sCa]sLar， (2)
Wherein u isaIs the output voltage in the abc coordinate system, eaIs one phase of three-phase network voltage, s is Laplace operator, LagIs a grid side inductor, CaIs a filter capacitor, LarIs a converter side inductor.
In the α β coordinate system, the β axis lags the α axis by 90 °. Thus, the output voltage u is determined according to equation (2)αThe output voltage u can then be passed through a phase-shifting filterαPhase-shifted by 90 DEG to obtain an output voltage uβ. Specifically, the output voltage u may be determined according to equation (3)β，
Xi is the system damping coefficient of the phase shift filter and is related to the power grid frequency f0Has a conversion relation of omega0＝2πf0。ω0For grid angular frequency, a value of 0.707 may be preferred in this embodiment.
In step S11, the phase θ of the predicted bridge arm output voltage is calculated1And the phase theta of the reference voltage of SVPWM before compensation2The phase difference between Δ θ. Specifically, in this embodiment, the phase θ is referred to1Can be calculated by using the formula (4),
for phase theta2The reference voltage u of the SVPWM generated in the dq coordinate system before compensation needs to be generated firstd *And uq *Converting into reference voltage u under alpha beta coordinate systemdq-αAnd udq-β. Specifically, the reference voltage u of the SVPWM generated in the dq coordinate system before compensation can be expressed by equation (5)d *And uq *Conversion to alpha-beta coordinate systemReference voltage udq-αAnd udq-β，
After the conversion is complete, the phase θ can be calculated according to equation (6)2，
Finally, the phase difference Δ θ can be calculated according to equation (7),
Δθ＝θ1-θ2， (7)。
in step S12, a compensation amount of the pulse width modulation delay is determined based on the phase difference Δ θ and the calculated delay of the sampling period of the three-phase converter.
For a sampling period, its value is Ts. In the prior art, the delay in the α β coordinate system is considered to be
Transformation into dq coordinate system as
In comparison, increase
This term. Therefore, it is required to
This term is eliminated by compensation, the amount of compensation then being
So that the compensation amount theta is fixedFF＝1.5Tsω0. However, in the method provided by the present invention, the compensation amount needs to be recalculated, so as to realize accurate decoupling and control. Specifically, the phase difference Δ θ may be first converted according to equation (8)，
The sum of the sampling computation delay and the pulse width modulation delay in the alpha-beta coordinate system is
Transformation into the dq coordinate system is
In comparison, the sum is increased
To eliminate this term, the compensation amount θ is increasedFF', and
specifically, the compensation amount can be calculated according to equation (9),
θFF′＝(Ts+Tpre)ω0＝Tsω0+Δθ， (9)
wherein, TsIs the sampling period.
In step S13, the predicted phase values of the three-phase converter are corrected based on the compensation amount.
In another aspect, the present invention also provides a predicted phase delay compensation system of a three-phase current transformer, which may include a processor that may be configured to perform the method as illustrated in fig. 2. In particular, the processor may be configured to:
in step S10, the output voltage u of the converter leg is predictedαAnd uβ. In this embodiment, since the three-phase current converter is usually operated in a rectifying or inverting state, the output voltage u is calculatedαAnd uβTime, reference current iq *May be 0. Therefore, the output voltage u is calculatedαAnd uβThen, the alpha beta seat can be determined according to the formula (1)Current reference i under the systemα *And iβ *，
Wherein id *Is the active current in dq coordinate system, theta0The phase angle of the corresponding grid voltage of the three-phase converter.
In the block diagram shown in fig. 1, since the abc coordinate system and the α β coordinate system are both stationary coordinate systems, and the a axis and the α axis coincide. Therefore, uα＝ua，iα *＝ia *. Accordingly, the output voltage uαIt can be derived from the parameters of the a-phase filter. Specifically, the output voltage u may be determined according to equation (2)α，
uα＝ua＝ea-sLagiα *+[iα *+(ea-sLagiα *)sCa]sLar， (2)
Wherein u isaIs the output voltage in the abc coordinate system, eaIs one phase of three-phase network voltage, s is Laplace operator, LagIs a grid side inductor, CaIs a filter capacitor, LarIs a converter side inductor.
In the α β coordinate system, the β axis lags the α axis by 90 °. Thus, the output voltage u is determined according to equation (2)αThe output voltage u can then be passed through a phase-shifting filterαPhase-shifted by 90 DEG to obtain an output voltage uβ. Specifically, the output voltage u may be determined according to equation (3)β，
Xi is the system damping coefficient of the phase shift filter and is related to the power grid frequency f0Has a conversion relation of omega0＝2πf0。ω0For grid angular frequency, a value of 0.707 may be preferred in this embodiment.
In step S11, the phase θ of the predicted bridge arm output voltage is calculated1And the phase theta of the reference voltage of SVPWM before compensation2The phase difference between Δ θ. Specifically, in this embodiment, the phase θ is referred to1Can be calculated by using the formula (4),
for phase theta2The reference voltage u of the SVPWM generated in the dq coordinate system before compensation needs to be generated firstd *And uq *Converting into reference voltage u under alpha beta coordinate systemdq-αAnd udq-β. Specifically, the reference voltage u of the SVPWM generated in the dq coordinate system before compensation can be expressed by equation (5)d *And uq *Converting into reference voltage u under alpha beta coordinate systemdq-αAnd udq-β，
After the conversion is complete, the phase θ can be calculated according to equation (6)2，
Finally, the phase difference Δ θ can be calculated according to equation (7),
Δθ＝θ1-θ2， (7)。
in step S12, a compensation amount of the pulse width modulation delay is determined based on the phase difference Δ θ and the calculated delay of the sampling period of the three-phase converter.
For a sampling period, its value is Ts. In the prior art, the delay in the α β coordinate system is considered to be
Transformation into dq coordinate system as
In comparison, increase
This term. Therefore, it is required to
This term is eliminated by compensation, the amount of compensation then being
So that the compensation amount theta is fixedFF＝1.5Tsω0. However, in the method provided by the present invention, the compensation amount needs to be recalculated, so as to realize accurate decoupling and control. Specifically, the phase difference Δ θ may be first converted according to equation (8),
the sum of the sampling computation delay and the pulse width modulation delay in the alpha-beta coordinate system is
Transformation into the dq coordinate system is
In comparison, the sum is increased
To eliminate this term, the compensation amount θ is increasedFF', and
specifically, the compensation amount can be calculated according to equation (9),
θFF′＝(Ts+Tpre)ω0＝Tsω0+Δθ， (9)
wherein, TsIs the sampling period.
In step S13, the predicted phase values of the three-phase converter are corrected based on the compensation amount.
In yet another aspect, the present disclosure also provides a storage medium that may store instructions that are readable by a machine to cause the machine to perform a method as illustrated in fig. 2.
Through the technical scheme, the method and the system for predicting the phase delay compensation of the three-phase converter provided by the invention have the advantages that the compensation quantity of the pulse width modulation delay is accurately calculated, the technical problem of poor decoupling effect of active current and reactive current caused by inaccurate compensation quantity of an electric power system in the prior art is solved, and the control accuracy of the electric power system is improved.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.
Those skilled in the art can understand that all or part of the steps in the method for implementing the above embodiments may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, various different embodiments of the present invention may be arbitrarily combined with each other, and the embodiments of the present invention should be considered as disclosed in the disclosure of the embodiments of the present invention as long as the embodiments do not depart from the spirit of the embodiments of the present invention.
Claims (9)
1. A predicted phase delay compensation method for a three-phase converter is characterized by comprising the following steps:
predicting output voltage u of converter bridge armαAnd uβ；
Calculating the phase theta of the predicted voltage output by the bridge arm1And the phase theta of the reference voltage of SVPWM before compensation2The phase difference Δ θ between;
determining compensation quantity of pulse width modulation delay according to the phase difference delta theta and the calculation delay of the sampling period of the three-phase converter;
and correcting the predicted phase value of the three-phase converter according to the compensation amount.
2. Method according to claim 1, characterized in that the output voltage u of a converter leg is predictedαAnd uβThe method specifically comprises the following steps:
determining a current reference i in an alpha beta coordinate system according to formula (1)α *And iβ *，
Wherein id *Is the active current in dq coordinate system, theta0The phase angle of the power grid voltage corresponding to the three-phase converter is obtained;
determining the output voltage u according to equation (2)α，
uα＝ua＝ea-sLagiα *+[iα *+(ea-sLagiα *)sCa]sLar， (2)
Wherein u isaIs the output voltage in the abc coordinate system, eaIs one phase of three-phase network voltage, s is Laplace operator, LagIs a grid side inductor, CaIs a filter capacitor, LarIs a converter side inductor;
determining the output voltage u according to equation (3)β，
Where xi is the system damping coefficient of the phase shift filter, omega0Is the grid angular frequency.
3. The method of claim 1, wherein the phase θ of the leg output predicted voltage is calculated1And reference voltage phase theta of SVPWM before compensation2The phase difference Δ θ therebetween specifically includes:
calculating the phase theta according to equation (4)1，
According to the formula (5), the reference voltage u of the SVPWM generated under the dq coordinate system before compensationd *And uq *Converting into reference voltage u under alpha beta coordinate systemdq-αAnd udq-β，
Calculating the phase theta according to equation (6)2，
The phase difference delta theta is calculated according to equation (7),
Δθ＝θ1-θ2， (7)。
4. the method according to claim 1, wherein determining the compensation amount of the pwm delay according to the phase difference Δ θ and the calculated delay of the sampling period of the three-phase converter specifically comprises:
the phase difference delta theta is converted according to equation (8),
calculating the compensation amount according to equation (9),
θFF′＝(Ts+Tpre)ω0＝Tsω0+Δθ， (9)
wherein, TsIs the sampling period.
5. A predicted phase delay compensation system for a three-phase current transformer, the system comprising a processor configured to:
predicting output voltage u of converter bridge armαAnd uβ；
Calculating the phase theta of the predicted voltage output by the bridge arm1And the phase theta of the reference voltage of SVPWM before compensation2The phase difference Δ θ between;
determining compensation quantity of pulse width modulation delay according to the phase difference delta theta and the calculation delay of the sampling period of the three-phase converter;
and correcting the predicted phase value of the three-phase converter according to the compensation amount.
6. The system of claim 5, wherein the processor is further configured to:
determining a current reference i in an alpha beta coordinate system according to formula (1)α *And iβ *，
Wherein id *Is the active current in dq coordinate system, theta0The phase angle of the power grid voltage corresponding to the three-phase converter is obtained;
determining the output voltage u according to equation (2)α，
uα＝ua＝ea-sLagiα *+[iα *+(ea-sLagiα *)sCa]sLar， (2)
Wherein u isaIs the output voltage in the abc coordinate system, eaIs one phase of three-phase network voltage, s is Laplace operator, LagIs a grid side inductor, CaIs a filter capacitor, LarIs a converter side inductor;
determining the output voltage u according to equation (3)β，
Where xi is the system damping coefficient of the phase shift filter, omega0Is the grid angular frequency.
7. The system of claim 5, wherein the processor is further configured to:
calculating the phase theta according to equation (4)1，
According to the formula(5) The reference voltage u of the SVPWM generated under the dq coordinate system before compensationd *And uq *Converting into reference voltage u under alpha beta coordinate systemdq-αAnd udq-β，
Calculating the phase theta according to equation (6)2，
The phase difference delta theta is calculated according to equation (7),
Δθ＝θ1-θ2， (7)。
8. the system of claim 5, wherein the processor is further configured to:
the phase difference delta theta is converted according to equation (8),
calculating the compensation amount according to equation (9),
θFF′＝(Ts+Tpre)ω0＝Tsω0+Δθ， (9)
wherein, TsIs the sampling period.
9. A storage medium storing instructions for reading by a machine to cause the machine to perform a method according to any one of claims 1 to 4.
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| CN112510755B (en) | 2023-03-14 |
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