CN117040299A - Hybrid control method for converter - Google Patents
Hybrid control method for converter Download PDFInfo
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- CN117040299A CN117040299A CN202311020871.5A CN202311020871A CN117040299A CN 117040299 A CN117040299 A CN 117040299A CN 202311020871 A CN202311020871 A CN 202311020871A CN 117040299 A CN117040299 A CN 117040299A
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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
- H02M7/42—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
-
- 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
-
- 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
- H02M1/0012—Control circuits using digital or numerical techniques
-
- 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
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
-
- 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
- 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
- H02M7/4815—Resonant converters
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ac-Ac Conversion (AREA)
Abstract
The invention discloses a mixed control method of a converter, which belongs to the technical field of power electronics, and comprises the following steps: the control link of the converter adopts inductive current feedback double-loop control, so that the three-phase converter can supply power for balanced and unbalanced loads simultaneously; the current loop of the converter control link is additionally provided with load current feedforward control, so that stable switching between full load and no load of the system is realized; and a phase compensation resonance control is added in a voltage ring of the converter control link, so that the phase angle stability margin of the system is improved. The invention can ensure that the converter outputs high-quality three-phase voltage waveforms under unbalanced and nonlinear loads, and can inhibit voltage fluctuation when the loads suddenly change, and has good technical effect and high practical value.
Description
Technical Field
The invention relates to a hybrid control method of a converter, and belongs to the technical field of power electronics.
Background
The converter control technology is a key technology in the industries of efficient energy utilization, new energy development, environmental protection and high and new technology. In production practice, it is often required to change the power frequency ac power or dc power into ac power with fixed or adjustable frequency and voltage, and supply the ac power to a load so as to implement variable frequency speed regulation of an ac motor, or to provide a power supply for an induction electric heating furnace, and to provide a non-power-failure working power supply for important devices such as an electronic computer and medical equipment. The converter control technology plays a great role in various fields such as development and utilization of new energy, emerging high-tech industry, national defense technology and the like, and plays a vital role.
High power density and power quality are required in the fields of aerospace, ships, traffic, new energy and the like. These scenarios therefore generally place high demands on the quality of the output voltage waveform, requiring satisfaction of the voltage requirements of unbalanced and nonlinear loads, as well as smooth transitions when the load suddenly changes. Aiming at the problems, a three-phase four-bridge arm converter is mostly adopted as a circuit topology, the three-phase four-bridge arm converter can be applied to the problem of unbalance of a system, and voltage quality is ensured through a corresponding control mode, for example, CN115800328A discloses a control method, a device and a medium for unbalanced output voltage of the three-phase four-bridge arm full-bridge converter.
Disclosure of Invention
The invention aims to provide a hybrid control method of a converter, which can ensure high quality of three-phase output voltage waveforms under unbalanced load and nonlinear load and relieve voltage fluctuation when the load suddenly changes under the condition of a topological structure of a three-phase four-bridge arm converter.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a hybrid control method of a converter, comprising:
the control link of the converter adopts inductive currentFeedback double-loop control, by the d-axis component u of the load-side voltage collected in the load-side line d And a load-side voltage q-axis component u q After the input component passes through the PIR controller of the voltage ring, the output quantity is input into the current ring, so that the three-phase converter can supply power for balanced and unbalanced loads at the same time;
meanwhile, load current feedforward control is added in a current loop of a converter control link, and a load side current d-axis component i acquired in a load side line od And load side current q-axis component i oq Is input into the current loop through the feedforward coefficient of the load current for input quantity, reduces the load current i o The influence on the output voltage realizes the stable switching between full load and no load of the system;
meanwhile, phase compensation resonance control is added in a voltage ring of a converter control link, a resonance controller with phase compensation is added in the voltage ring, and the phase angle stability margin of the system is improved.
The technical scheme of the invention is further improved as follows: the PIR controller based voltage loop transfer function is:
wherein omega 0 ＝2πf rad/s,N(s)＝K P (s 2 +4ω 0 2 )s+K I (s 2 +4ω 0 2 )+K I s 2 ，K P Is a proportionality coefficient, K I Is an integral coefficient.
The technical scheme of the invention is further improved as follows: the load current and output voltage expressions are:
wherein G is v (s) is a voltage loop transfer function based on PIR controller, G i (s) is a transfer function of the current loop, K PWM For the converter gain, L is the converter sideInductance C is the converter side capacitance, f v For voltage sampling coefficient, f i X(s) is a load current feedforward coefficient; u (u) ref Is a voltage reference value; i.e 0 Is the load current;
the load current feedforward coefficient expression is:
wherein G is i (s) is a transfer function of the current loop, K PWM For the gain of the converter, L is the inductance of the converter side, f i For the current sampling coefficient, τ is a sufficiently small constant.
The technical scheme of the invention is further improved as follows: the phase compensation resonance control transfer function is:
wherein k is r Is the resonance coefficient; θ n Compensating the angle for time; n is an integer, n=1, 2,3.
By adopting the technical scheme, the invention has the following technical effects:
the control link of the current transformer adopts inductive current feedback double-loop control, so that the three-phase current transformer can supply power for balanced and unbalanced loads simultaneously; the current loop of the converter control link is additionally provided with load current feedforward control, so that stable switching between full load and no load of the system is realized; the phase compensation resonance control is added in the voltage ring of the converter control link, so that the phase angle stability margin of the system is improved; the output voltage quality of the converter when the unbalanced load and the nonlinear load are connected can be ensured pertinently, smooth switching between no-load and full-load of the load end can be realized, and the technical effect is good and the practical value is high.
Drawings
For a clearer description of embodiments of the invention or of the solutions of the prior art, the drawings that are used in the description of the embodiments or of the prior art will be briefly described, it being obvious that the drawings in the description below are some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art;
fig. 1 is a schematic diagram of a system circuit and a control unit of a hybrid control method of a current transformer according to the present invention;
FIG. 2 is a block diagram of an inductor current feedback dual loop control in accordance with the present invention;
fig. 3 is a block diagram of load current feedforward control in the present invention.
Detailed Description
It is noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of the present invention and in the foregoing figures, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, a hybrid control method for a converter includes:
the main circuit of the three-phase four-bridge arm converter comprises the following components from left to right: DC power supply, three-phase four-bridge arm circuit and filter inductor L f Filter capacitor C f Load.
Current i on the side of the converter Labc The d-axis component i of the inductor current at the converter side is obtained after the acquisition in the line at the converter side and the coordinate transformation d And a current transformer side inductor current q-axis component i q ；
Load side inductor current i abc The d-axis component i of the inductance current at the load side is obtained after the coordinate transformation is acquired from the load side circuit od And a load side inductor current q-axis component i oq ；
Load side voltage u abc By the loadThe load side voltage d-axis component u is obtained after the acquisition in the side line and the coordinate transformation d And a load-side voltage q-axis component u q ；
The modulation mode of the three-phase four bridge arms is carrier wave lamination pulse width modulation, the midpoint voltage is controlled by adopting a zero sequence injection method, and the three-phase four bridge arms are controlled by adopting a voltage and current double closed loop control mode.
Wherein the active power and the reactive power are controlled by a load side voltage v abc And load side current i abc And (5) calculating to obtain the product.
Meanwhile, as shown in fig. 1, a phase compensation resonance control is added in a voltage loop of a converter control link, and a resonance controller with phase compensation is added in the voltage loop, so that the phase angle stability margin of the system is improved.
The phase compensation resonance control transfer function is as follows:
wherein k is r Is the resonance coefficient; θ n Compensating the angle for time; n is an integer, n=1, 2,3.
As shown in fig. 2, the double loop control process with inductor current feedback is:
reference voltage u dref /u qref And output voltage d/q axis component u d /u q After the difference is made, the output signal of the difference passes through a PIR controller and a phase compensation resonance controller, and the d/q axis component i of the inductor current at the side of the converter Ld /i Lq And continuing to make difference, and inputting the obtained output signal into a current loop as an input signal, and inputting the input signal into a modulation link after PI adjustment, so that the three-phase converter can supply power for balanced and unbalanced loads at the same time.
Wherein, the voltage loop transfer function based on PIR controller is:
wherein omega 0 ＝2πf rad/s；N(s)＝K P (s 2 +4ω 0 2 )s+K I (s 2 +4ω 0 2 )+K I s 2 ；K P Is a proportionality coefficient; k (K) I Is an integral coefficient; s is a transformation after the Lawster transformation, and has no special meaning.
As shown in fig. 3, the load current feedforward control process is:
reference voltage u dref /u qref And output voltage d/q axis component u d /u q After the difference is made, the output signal of the difference passes through a PIR controller and a phase compensation resonance controller, and the d/q axis component i of the inductor current at the side of the converter Ld /i Lq Continuing the difference, the resulting output signal is input as an input signal into the current loop, the d/q axis component i of the load current od /i oq And multiplying the output value of the current loop by the feedforward coefficient of the load current, adding the multiplied output value of the current loop, and performing PI (proportional integral) adjustment to obtain an output signal. And stable switching between full load and no load of the system is realized.
The expression of the load current and the output voltage is as follows:
wherein G is v (s) is a PIR controller based voltage loop transfer function; g i (s) is a current loop transfer function; k (K) PWM Gain for the converter; l is the side inductance of the converter; c is the side capacitance of the converter; f (f) v Is a voltage sampling coefficient; f (f) i Is the current sampling coefficient; x(s) is the load current feedforward coefficient; u (u) ref Is a voltage reference value; i.e 0 Is the load current;
the load current feedforward coefficient expression is:
wherein G is i (s) is a transfer function of the current loop, K PWM For the converter gain, L is the variationInductor on current transformer side, f i For the current sampling coefficient, τ is a sufficiently small constant.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (4)
1. A hybrid control method for a converter, comprising:
the control link of the converter adopts inductive current feedback double-loop control, and the d-axis component u of the load side voltage acquired from the load side line d And a load-side voltage q-axis component u q After the input component passes through the PIR controller of the voltage ring, the output quantity is input into the current ring, so that the three-phase converter can supply power for balanced and unbalanced loads at the same time;
meanwhile, load current feedforward control is added in a current loop of a converter control link, and a load side current d-axis component i acquired in a load side line od And load side current q-axis component i oq Is input into the current loop through the feedforward coefficient of the load current for input quantity, reduces the load current i o The influence on the output voltage realizes the stable switching between full load and no load of the system;
meanwhile, phase compensation resonance control is added in a voltage ring of a converter control link, a resonance controller with phase compensation is added in the voltage ring, and the phase angle stability margin of the system is improved.
2. The converter hybrid control method according to claim 1, wherein:
the PIR controller based voltage loop transfer function is:
wherein omega 0 ＝2πf rad/s,N(s)＝K P (s 2 +4ω 0 2 )s+K I (s 2 +4ω 0 2 )+K I s 2 ，K P Is a proportionality coefficient, K I Is an integral coefficient.
3. The converter hybrid control method according to claim 1, wherein:
the load current and output voltage expressions are:
wherein G is v (s) is a voltage loop transfer function based on PIR controller, G i (s) is a transfer function of the current loop, K PWM The gain of the converter is L is the inductance of the converter side, C is the capacitance of the converter side, f v For voltage sampling coefficient, f i X(s) is a load current feedforward coefficient; u (u) ref Is a voltage reference value; i.e 0 Is the load current;
the load current feedforward coefficient expression is:
wherein G is i (s) is a transfer function of the current loop, K PWM For the gain of the converter, L is the inductance of the converter side, f i For the current sampling coefficient, τ is a sufficiently small constant.
4. The converter hybrid control method according to claim 1, wherein:
the phase compensation resonance control transfer function is:
wherein k is r Is the resonance coefficient; θ n Compensating the angle for time; n is an integer, n=1, 2,3.
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