CN111541358B - Variable frequency switch sequence control method, variable frequency switch sequence control system, variable frequency switch sequence control storage medium, variable frequency switch sequence control device and variable frequency switch sequence control application - Google Patents

Variable frequency switch sequence control method, variable frequency switch sequence control system, variable frequency switch sequence control storage medium, variable frequency switch sequence control device and variable frequency switch sequence control application Download PDF

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CN111541358B
CN111541358B CN202010216265.0A CN202010216265A CN111541358B CN 111541358 B CN111541358 B CN 111541358B CN 202010216265 A CN202010216265 A CN 202010216265A CN 111541358 B CN111541358 B CN 111541358B
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variable frequency
sequence control
frequency switch
switch sequence
tracking
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CN111541358A (en
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康纪新
戴志勇
张菊香
李建文
候叶
张�杰
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Xidian University
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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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B15/00—Systems controlled by a computer
    • G05B15/02—Systems controlled by a computer electric
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Inverter Devices (AREA)

Abstract

The invention belongs to the technical field of variable frequency switch sequence control, and discloses a variable frequency switch sequence control method, a variable frequency switch sequence control system, a storage medium, a storage device and application, wherein a first-order continuous switch system model is established; designing an input variable u; obtaining a power element switching sequence; tracking errors are obtained and analyzed. The system comprises: the single-phase L-shaped inverter model is used for establishing a first-order continuous switching system model; the controllable direct current power supply is used for controlling the amplitude of the input variable u; the control panel writes a DSP program to enable a power switch element in the inverter to be turned on and turned off according to a designed high-frequency switch sequence; an oscilloscope with a digital filtering function is used for observing a current signal, tracking a given signal and carrying out error analysis. The invention tracks the dynamic response of a given signal quickly, and has accurate steady-state error when the follow-up signal changes.

Description

Variable frequency switch sequence control method, variable frequency switch sequence control system, variable frequency switch sequence control storage medium, variable frequency switch sequence control device and variable frequency switch sequence control application
Technical Field
The invention belongs to the technical field of variable frequency switch sequence control, and particularly relates to a variable frequency switch sequence control method, a variable frequency switch sequence control system, a storage medium, a storage device and an application.
Background
In recent decades, power electronic devices have been rapidly developed, and the power electronic devices have wide application in new energy grid-connected systems, and in power grid systems, a large number of power switching elements such as MOS transistors, insulated gate bipolar transistors and the like are used. The high-frequency switch of the power element in the grid-connected inverter enables the grid-connected system to be a switch control system, the switch of the power element has great influence on the performance of the grid-connected system, and the stability of the whole grid-connected system is influenced. The stability of the whole power system should be fully discussed based on the theory of high frequency switch control. However, in theory, there is no system theory to address the effect of the power element on the stability of the overall grid-tie system. Switching losses of the power components are also a concern when designing the impact of the switching modulation method on the stability of the power switching system. There are many factors that cause switching losses, such as: voltage unbalance, high frequency switching amount of switching element, etc.; switching losses occur mainly at high frequencies, and an increasing range of operating frequencies in practical power converters causes switching losses and often is a major cause of reduced efficiency of electronic power equipment, and an increase in losses leads to an increase in device temperature, which means that the semiconductor characteristics change and the risk of damage is high, thus largely determining the final performance of the design. While most of the methods that have been proposed to mitigate static and dynamic voltage imbalances for voltage imbalances increase transistor losses. The presently proposed series lossless series high voltage switch (LHVS) is to mitigate voltage imbalance and thereby reduce switching losses. In the power grid, a two-way active bridge (DAB) topology is used for medium and high voltage power conversion to reduce switching losses.
The traditional switching modulation method is so-called Pulse Width Modulation (PWM) which is to implement switching control by comparing a fixed frequency carrier with the output of a designed continuous controller. In order to improve the accuracy of power switching systems, many advanced modulation methods have been proposed, such as SPWM and SVPWM. However, at present, when a switch control system is designed, the in-industry modulation method only aims at designing to enable the power system to be stable, and no theoretical basis is used for analyzing the stability and error analysis of the system, and the influence of the modulation method on the stability of the power system is not considered. There is no system in theory to discuss the stability and steady state accuracy of the above-described switch modulation method.
Through the above analysis, the problems and defects existing in the prior art are as follows: at present, when a switch control system is designed, the influence of a modulation method on the stability of a power system is not considered; there is no system in theory to discuss the stability and steady state accuracy of the above-described switch modulation method.
The difficulty of solving the problems and the defects is as follows: the existing PWM method is based on the area equivalent principle, but ignores the error influence brought by a given signal or disturbance on a modulation layer, so that the error is uncontrollable, and the tracking precision is limited.
The meaning of solving the problems and the defects is as follows: the invention belongs to a novel power system modulation method, which can effectively analyze the stability of a power system, and can control a time tracking error in an ideal range when disturbance exists or a given signal is a time-varying signal, and provide reference significance for the modulation of the power system.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a variable frequency switch sequence control method, a variable frequency switch sequence control system, a storage medium, a storage device and application.
The invention is realized in such a way that a variable frequency switch sequence control method comprises the following steps:
firstly, establishing a first-order continuous switch system model;
secondly, designing an input variable u;
thirdly, obtaining a power element switch switching sequence;
when i is even:
Figure GDA0004138910080000021
when i is an odd number:
Figure GDA0004138910080000022
wherein k is 0.ltoreq.k i Less than or equal to 1, lambda is a first-order continuous system characteristic value, lambda > 0,U and b are constants, U > 0, T is a time period, x * To track a given signal; u is the amplitude of the controllable direct current power supply, b is determined by the parameters of the L inverter and the equivalent loads at the two ends of the inverter, and is a constant;
fourth, tracking errors are obtained and analyzed.
Further, the second step designs the input variable u, u to satisfy:
when i is even:
(1)t∈[iT,iT+k i T]when u=u;
(2)t∈[iT+k i T,(i+1)T]when u= -U;
when i is an odd number:
(1)t∈[iT,iT+k i T]when u= -U;
(2)t∈[iT+k i T,(i+1)T]when u=u;
wherein k is 0.ltoreq.k i And the time period is less than or equal to 1, U is more than 0, and T is the time period.
Further, the fourth step obtains a tracking error and analyzes:
Figure GDA0004138910080000031
Figure GDA0004138910080000032
in the case of i=0, 2,4 …, T e [ iT, (i+1) T]At the time, as t increases, tracking error
Figure GDA0004138910080000033
Become larger and then smaller at t=it+k i The maximum value is obtained at the time of T;
in the case of i=1, 3,5 …, T e [ iT, (i+1) T]At the time, as t increases, tracking error
Figure GDA0004138910080000034
First smaller and then larger, at t=it+k i The minimum value is obtained at T.
It is another object of the present invention to provide a storage medium for receiving a user input program, the stored computer program causing an electronic device to execute the variable frequency switching sequence control method comprising the steps of:
firstly, establishing a first-order continuous switch system model;
secondly, designing an input variable u;
thirdly, obtaining a power element switch switching sequence;
when i is even:
Figure GDA0004138910080000041
when i is an odd number:
Figure GDA0004138910080000042
wherein k is 0.ltoreq.k i Less than or equal to 1, lambda is a first-order continuous system characteristic value, lambda > 0,U and b are constants, U > 0, T is a time period, x * To track a given signal;
fourth, tracking errors are obtained and analyzed.
It is another object of the present invention to provide a computer program product stored on a computer readable medium, comprising a computer readable program for providing a user input interface for implementing the variable frequency switch sequence control method when executed on an electronic device.
Another object of the present invention is to provide a variable frequency switch sequence control system for implementing the variable frequency switch sequence control method, the variable frequency switch sequence control system comprising:
the single-phase L-shaped inverter model is used for establishing a first-order continuous switching system model;
the controllable direct current power supply is used for controlling the amplitude of the input variable u;
the control panel writes a DSP program to enable a power switch element in the inverter to be turned on and turned off according to a designed high-frequency switch sequence;
an oscilloscope with a digital filtering function is used for observing a current signal, tracking a given signal and carrying out error analysis.
Another object of the present invention is to provide a variable frequency switch sequence control and error analysis device equipped with the variable frequency switch sequence control system.
Another object of the present invention is to provide a power element in a grid-connected inverter mounted with the variable frequency switch sequence control and error analysis device.
Another object of the present invention is to provide a power switching system in which the variable frequency switching sequence control and error analysis device is installed.
Another object of the present invention is to provide a power electronic device equipped with the variable frequency switch sequence control and error analysis device.
By combining all the technical schemes, the invention has the advantages and positive effects that: the prior art only gives a designed switch control strategy and does not systematically address the theory about the stability and steady state accuracy of power switch control. The invention fully discusses the stability of the whole power system based on a switch control theory, has fast dynamic response of tracking a given signal, can track within 1ms when the following signal is changed, and has accurate steady-state error. Meanwhile, the switching sequence control method and the tracking error analysis method of the first-order power switch system provided by the invention analyze the stability and the steady-state precision of the first-order power switch control.
As shown in fig. 4 (a), the steady-state simulation diagram of tracking when tracking a given direct current signal is shown in fig. 4 (b), the steady-state simulation diagram of tracking when tracking a given sinusoidal (alternating current) signal is shown in fig. 4 (c), and the dynamic simulation diagram of tracking when tracking a given direct current signal is shown in fig. 4 (c); the detection method has good dynamic response and accurate steady-state error. The invention fully discusses the stability of the whole power system based on a switch control theory, has fast dynamic response of tracking given signals and has accurate steady-state error analysis.
Compared with the prior art, the invention can reduce the switching loss of the power components.
Drawings
Fig. 1 is a flowchart of a variable frequency switch sequence control method provided in an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a variable frequency switch sequence control system according to an embodiment of the present invention.
Fig. 3 is a flowchart of an implementation of a variable frequency switch sequence control method according to an embodiment of the present invention.
FIG. 4 is a current tracking simulation diagram provided by an embodiment of the present invention;
in the figure: (a) tracking a steady state simulation of the direct current; (b) tracking a steady state simulation of the sinusoidal signal; (c) tracking the dynamic simulation map of the direct current.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Aiming at the problems existing in the prior art, the invention provides a variable frequency switch sequence control method, a variable frequency switch sequence control system, a variable frequency switch sequence control storage medium, a variable frequency switch sequence control device and an application, and the variable frequency switch sequence control method, the variable frequency switch sequence control device and the variable frequency switch sequence control application are described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the variable frequency switch sequence control method provided by the invention comprises the following steps:
s101: and establishing a first-order continuous switch system model.
S102: the input variable u is designed.
S103: a power element switching sequence is obtained.
S104: an accurate tracking error is obtained and analyzed.
As shown in fig. 2, the variable frequency switch sequence control system provided by the present invention includes:
and (3) establishing a single-phase L-shaped inverter model and establishing a first-order continuous switching system model.
And the controllable direct current power supply is used for generating the magnitude of the control input variable u required in the algorithm.
C2000 Microcontroller TMS320F28379D control board, programming DSP programs to cause the power switching elements in the inverter to switch (on and off) in a designed high frequency switching sequence.
An oscilloscope with a digital filtering function is used for observing a current signal and tracking a given signal and performing error analysis on the current signal and the given signal.
The technical scheme of the invention is further described below with reference to the accompanying drawings.
As shown in fig. 3, the variable frequency switch sequence control method provided by the invention comprises the following steps:
the first step: and establishing a first-order continuous switch system model.
And a second step of: the design input variables u, u satisfy the following relationship:
when i is even:
(1)t∈[iT,iT+k i T]when u=u;
(2)t∈[iT+k i T,(i+1)T]when u= -U;
when i is an odd number:
(1)t∈[iT,iT+k i T]when u= -U;
(2)t∈[iT+k i T,(i+1)T]when u=u;
wherein k is 0.ltoreq.k i And the time period is less than or equal to 1, U is more than 0, and T is the time period.
And a third step of: obtaining a power element switch switching sequence:
when i is even:
Figure GDA0004138910080000071
when i is an odd number:
Figure GDA0004138910080000072
wherein k is 0.ltoreq.k i Less than or equal to 1, lambda is a first-order continuous system characteristic value, lambda > 0,U and b are constants, U > 0, T is a time period, x * To track a given signal. U is the amplitude of the controllable direct current power supply, b is determined by the parameters of the L inverter and the equivalent loads at the two ends of the inverter, and is a constant;
fourth step: obtaining accurate tracking errors and analyzing:
Figure GDA0004138910080000073
Figure GDA0004138910080000074
in the case of i=0, 2,4 …, T e [ iT, (i+1) T]At the time, as t increases, tracking error
Figure GDA0004138910080000075
Become larger and then smaller at t=it+k i The maximum value is obtained at the time of T;
in the case of i=1, 3,5 …, T e [ iT, (i+1) T]At the time, as t increases, tracking error
Figure GDA0004138910080000076
First smaller and then larger, at t=it+k i The minimum value is obtained at T.
The technical effects of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 4, it can be seen from the diagrams in fig. 4 (a) and 4 (b) that there is an accurate steady-state error when a given signal is tracked, and as can be seen from the diagram in fig. 4 (c), the tracking speed of the high-frequency switch sequence control method provided by the invention is high.
It should be noted that the embodiments of the present invention can be realized in hardware, software, or a combination of software and hardware. The hardware portion may be implemented using dedicated logic; the software portions may be stored in a memory and executed by a suitable instruction execution system, such as a microprocessor or special purpose design hardware. Those of ordinary skill in the art will appreciate that the apparatus and methods described above may be implemented using computer executable instructions and/or embodied in processor control code, such as provided on a carrier medium such as a magnetic disk, CD or DVD-ROM, a programmable memory such as read only memory (firmware), or a data carrier such as an optical or electronic signal carrier. The device of the present invention and its modules may be implemented by hardware circuitry, such as very large scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, etc., or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., as well as software executed by various types of processors, or by a combination of the above hardware circuitry and software, such as firmware.
The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the invention is not limited thereto, but any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present invention will be apparent to those skilled in the art within the scope of the present invention.

Claims (8)

1. The variable frequency switch sequence control method is characterized by comprising the following steps of:
firstly, establishing a first-order continuous switch system model;
secondly, designing an input variable u;
thirdly, obtaining a power element switch switching sequence;
when i is even:
Figure FDA0004035991740000011
when i is an odd number:
Figure FDA0004035991740000012
wherein k is 0.ltoreq.k i Less than or equal to 1, lambda is a first-order continuous system characteristic value, lambda > 0,U and b are constants, U > 0, T is a time period, x * To track a given signal; u is the amplitude of the controllable direct current power supply, b is determined by the parameters of the L inverter and the equivalent loads at the two ends of the inverter, and is a constant;
fourth, obtaining and analyzing tracking errors;
the fourth step obtains tracking errors and analyzes:
Figure FDA0004035991740000013
Figure FDA0004035991740000014
in the case of i=0, 2,4..]At the time, as t increases, tracking error
Figure FDA0004035991740000015
Become larger and then smaller at t=it+k i The maximum value is obtained at the time of T;
in the case of i=1, 3,5..]At the time, as t increases, tracking error
Figure FDA0004035991740000016
First smaller and then larger, at t=it+k i The minimum value is obtained at T.
2. The variable frequency switch sequence control method according to claim 1, wherein the second step designs the input variables u, u to satisfy:
when i is even:
(1)t∈[iT,iT+k i T]when u=u;
(2)t∈[iT+k i T,(i+1)T]when u= -U;
when i is an odd number:
(1)t∈[iT,iT+k i T]when u= -U;
(2)t∈[iT+k i T,(i+1)T]when u=u;
wherein k is 0.ltoreq.k i And the time period is less than or equal to 1, U is more than 0, and T is the time period.
3. A storage medium for receiving a user input program, the stored computer program causing an electronic device to execute the variable frequency switching sequence control method of any one of claims 1-2.
4. A variable frequency switch sequence control system implementing the variable frequency switch sequence control method of any one of claims 1-2, characterized in that the variable frequency switch sequence control system comprises:
the single-phase L-shaped inverter model is used for establishing a first-order continuous switching system model;
the controllable direct current power supply is used for controlling the amplitude of the input variable u;
the control panel writes a DSP program to enable a power switch element in the inverter to be turned on and turned off according to a designed high-frequency switch sequence;
an oscilloscope with a digital filtering function is used for observing a current signal, tracking a given signal and carrying out error analysis.
5. A variable frequency switch sequence control and error analysis device incorporating the variable frequency switch sequence control system of claim 4.
6. A power component in a grid-tie inverter equipped with the variable frequency switching sequence control and error analysis device of claim 5.
7. A power switching system incorporating the variable frequency switching sequence control and error analysis device of claim 5.
8. A power electronics device equipped with the variable frequency switch sequence control and error analysis device of claim 5.
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