CN115912947A - Three-phase rectification control device and three-phase rectification control method - Google Patents
Three-phase rectification control device and three-phase rectification control method Download PDFInfo
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Abstract
The embodiment of the disclosure provides a three-phase rectification control device and a three-phase rectification control method. The three-phase rectification control device comprises: the rectification module is connected with the alternating current three-phase power and rectifies the alternating current three-phase power according to the pulse width modulation control signal to obtain direct current output; the three-phase-locked loop module is used for acquiring phase information and voltage information of the alternating current three-phase power; the voltage control module is used for obtaining reference current information according to the voltage information of the direct current output; the current control module is used for converting the reference current information and the current information to obtain an initial modulation signal; the voltage balancing module is used for obtaining a compensation value of the modulation signal and superposing the initial modulation signal to obtain an output modulation signal; and the PWM generator module acquires the output modulation signal as the pulse width modulation control signal and outputs the output modulation signal to the rectification module. The embodiment of the scheme can realize constant control on direct current output and reduce algorithm complexity.
Description
Technical Field
The present disclosure relates to the field of rectification technologies, and in particular, to a rectification control device and a three-phase rectification control method.
Background
The main structure of the three-phase Power Factor Correction (PFC) or three-phase rectifier is an active Pulse Width Modulation (PWM) rectifier, and the three-phase PFC or three-phase PFC rectifier comprises a three-phase six-switch boost PFC, a three-phase six-switch buck PFC, a three-phase three-wire system Vienna rectifier and the like, and the control method comprises PI control, hysteresis current control, single-cycle control, slip film control, repetition control and the like.
In the prior art, the problem of constant control of the output voltage of a rectifier is realized by adopting a Space Vector modulation (SV-PWM) method. However, the control method is complex, the calculation amount is large, the engineering and production difficulties are large, and the research is still mainly performed at present.
Disclosure of Invention
Therefore, embodiments of the present disclosure provide a three-phase rectification control device and a three-phase rectification control method, which can implement constant control on a dc output.
In one aspect, a three-phase rectification control device provided in an embodiment of the present disclosure includes: the rectification module is connected with the alternating current three-phase power and rectifies the alternating current three-phase power according to the pulse width modulation control signal to obtain direct current output; the three-phase-locked loop module acquires phase information and voltage information of the alternating current three-phase power and acquires current information through the first conversion module; the voltage control module is used for obtaining reference current information according to the voltage information of the direct current output; the current control module is used for obtaining voltage control information according to the reference current information and the current information, and the voltage control information is converted into an initial modulation signal by a second conversion module; the harmonic injection module outputs odd harmonics; the voltage balancing module is used for superposing the initial modulation signal according to the voltage information of the direct current output and the odd harmonic to obtain an output modulation signal; and the PWM generator module acquires the output modulation signal as the pulse width modulation control signal and outputs the output modulation signal to the rectification module.
In a disclosed embodiment, the harmonic injection module outputs a third harmonic; and the voltage balancing module superposes the initial modulation signal according to the voltage information output by the direct current and the third harmonic to obtain an output modulation signal.
In a disclosed embodiment, the current information includes a q-axis current and a d-axis current; the current control module includes: the device comprises a q-axis current control module and a d-axis current control module; the two current control modules respectively obtain a q-axis voltage control signal and a d-axis voltage control signal through linear regulator operation according to respective current error signals of the q-axis current and the d-axis current; and the second conversion module converts the two voltage control signals to obtain the initial modulation signal.
In one disclosed embodiment, the three-phase rectification control device further comprises: the voltage balancer is connected to the direct current output to obtain a midpoint voltage; and the voltage balancing module takes the midpoint voltage as the voltage information, and superposes the initial modulation signal according to the midpoint voltage and the odd harmonics to obtain an output modulation signal.
In one disclosed embodiment, the three-phase rectification control device further comprises: the voltage balancer is connected to the direct current output to obtain a midpoint voltage; the reference current comprises a q-axis reference current and a d-axis reference current; and the voltage control module is used for obtaining the d-axis reference current according to the midpoint voltage, and the q-axis reference current is set to be 0.
In a disclosed embodiment, the voltage balancer includes two capacitors connected in series on the dc output, and the midpoint voltage is a voltage between the two capacitors.
In a disclosed embodiment, the voltage balancing module superimposes the initial modulation signal according to the odd harmonics through a scaler operation.
On the other hand, the three-phase rectification control method provided by the embodiment of the disclosure comprises the steps of obtaining alternating current three-phase power, and obtaining current information of the alternating current three-phase power through first coordinate conversion; rectifying the alternating current three-phase power according to a pulse width modulation control signal to obtain direct current output; obtaining reference current information according to the voltage information of the direct current output; obtaining voltage control information according to the reference current information and the current information, and obtaining an initial modulation signal after secondary coordinate conversion; and superposing the initial modulation signal according to the voltage information of the direct current output and odd harmonics to obtain an output modulation signal, and using the output modulation signal as the pulse width modulation control signal.
In a disclosed embodiment, the odd harmonics are third harmonics, fifth harmonics or seventh harmonics.
In a disclosed embodiment, the initial modulation signal is superimposed according to the voltage information of the direct current output and odd harmonics, and the initial modulation signal is superimposed by adopting proportional regulator operation.
In summary, the above embodiments of the present application may have one or more of the following advantages or benefits: i) The problem of DC output voltage balance can be solved, and constant DC output is provided; ii) accurately acquiring phase information; iii) The control algorithm has low complexity, high response speed and flexible algorithm; iv) the control loop is simple, flexible and adjustable, product engineering is facilitated, risks caused by complex algorithms are avoided, and the cost performance is high; v) the harmonic distortion rate of the alternating three-phase power is less than 5%.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of a module connection of a three-phase rectification control device according to a first embodiment of the disclosure;
FIG. 2 is an electrical layout of the three-phase rectifier control of FIG. 1;
FIG. 3 is a waveform diagram of an alternating three-phase power;
FIG. 4 is a graph of phase information for an alternating three-phase power;
FIG. 5 is a graph of the median voltage information for DC output;
FIG. 6 is a graph of voltage information for DC output;
fig. 7 is a flowchart and a schematic diagram of a three-phase rectification control method according to a second embodiment of the disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the embodiments described are only some embodiments of the present disclosure, rather than all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The main structure of the three-phase power factor corrector or the three-phase rectifier is an active PWM rectifier, and the three-phase power factor corrector or the three-phase rectifier comprises three-phase six-switch boost type power factor correction, three-phase six-switch buck type power factor correction, a three-phase three-wire system Vienna rectifier and the like, and the control method comprises PI control, hysteresis current control, single-period control, sliding film control, repeated control and the like.
At present, a double-closed-loop PI control strategy is mostly adopted for rectification control, and a midpoint potential balance ring is superposed to Space Vector modulation (SV-PWM), so that the calculation amount is large, the dynamic response is slow, the method is too complex, the engineering difficulty is large, and the research is still mainly performed at present. The improvement of the whole current control is still optimized on the basis of SV-PWM, and the realization of the commercialization is difficult.
The embodiment of the disclosure aims to provide a simple and effective rectification control strategy, and on the basis of an integral framework of a voltage loop and a current loop, third harmonic injection and output voltage balance control are superposed, so that the technical requirements of output voltage control and high power factor of a three-phase vienna rectifier and small harmonic distortion rate of alternating current three-phase electricity are met, meanwhile, the complexity of an algorithm of a rectification control method is reduced, rapid development and delivery of products are promoted, and commercialization is realized.
The embodiment of the disclosure aims at a topological structure of a three-phase vienna rectifier, an overall control structure of an external voltage loop and an internal current loop is adopted, third harmonic injection and output voltage balance control are superimposed on an initial modulation signal, an output modulation signal is finally obtained, the waveform of the output modulation signal is modulated by a triangular carrier to generate a PWM (pulse-width modulation) driving waveform, the rectification process of the three-phase vienna rectifier is controlled according to the waveform, the current sine of the output voltage and the alternating current three-phase power is realized, the power factor is close to 1, constant direct current output is provided, and the harmonic distortion rate of the alternating current three-phase power is reduced to be below 5%.
[ first embodiment ] A method for manufacturing a semiconductor device
Referring to fig. 1, a schematic diagram of a module connection of a three-phase rectification control device according to a first embodiment of the present disclosure is shown. The control device includes, for example: the device comprises a rectification module, a three-phase-locked loop module, a first conversion module, a voltage control module, a current control module, a voltage balance module, a harmonic injection module, a second conversion module and a PWM generator module.
With reference to fig. 1 and 2, the rectifier module is a three-phase rectifier, which may be a three-phase vienna rectifier. The input end of the rectification module is connected with a three-phase power grid to access alternating current three-phase power, and the output end of the rectification module is connected with a direct current bus; the rectification module rectifies the alternating current three-phase power to obtain direct current output, and transmits and supplies power through a direct current bus.
Wherein, two electric capacity C1 are established ties on the direct current bus, and the voltage information of the direct current output who obtains after rectifier module includes: DC output voltage V BUS And a median voltage V PM And V MN (ii) a Wherein, V PM A voltage difference, V, between the positive output of the DC bus voltage and the midpoint of the capacitor MN Is the voltage difference of the negative output of the point-to-bus voltage of the capacitor. Referring to fig. 5, a graph of the median voltage information of the dc output is output.
And the three-phase-locked loop module is connected with a three-phase power grid to access the alternating current three-phase power, samples the voltage information (namely the three-phase instantaneous voltage) of the three-phase power grid, and calculates and acquires the phase information of the alternating current three-phase power. Specifically, the q-axis voltage is subjected to proportional amplification and integral operation to generate a phase angle θ of the alternating three-phase power, and the phase angle θ is an input quantity of the two conversion modules. Referring to fig. 4, a phase information diagram of an alternating three-phase power is shown.
The first conversion module is an abc/dq converter, is connected with the three-phase-locked loop module to obtain a phase angle theta, and is also electrically connected with alternating three-phase power to obtain three-phase currents ia, ib and ic; the first conversion module converts the three-phase current according to the phase angle theta to obtain a q-axis current I q And d-axis current I d And a q-axis input voltage front feedback component U is obtained q And d-axis input voltage feed-forward component U d 。
The voltage control module is specifically a voltage loop PI controller for acquiring a DC output reference voltage V BUS-REF The DC output reference voltage V BUS-REF Obtaining the voltage of the DC output for the preset target DC output voltage, namely obtaining the voltage V PM And V MN Voltage sum V of sum . Voltage control module according to V BUS-REF And V sum D-axis reference current I is obtained through calculation d.ref The calculation formula is as follows: I.C. A d.ref ＝(V BUS.REF －V SUM )*(K p.v +1/s*K i.v ) (ii) a Wherein, K p.v Is the proportionality coefficient of the voltage control module; k i.v Is the integral coefficient of the voltage control module.
The voltage control module also presets a q-axis reference current I q.ref Is 0, and d-axis reference current I d.ref And q-axis reference current I q.ref To the current control module.
The current control module acquires the d-axis reference current I d.ref And q-axis reference current I q.ref And obtaining q-axis current I output by the first conversion module q And d-axis current I d And calculating to obtain the voltage control information.
Specifically, the current control module comprises a d-axis current control module and a q-axis current control module; the d-axis current control module is a d-axis current PI controller, and the q-axis current control module is a q-axis current PI controller.
Wherein, the d-axis current PI controller obtains a d-axis reference current I d.ref And d-axis current I d And according to the formula (I) d.ref －I d )*(K p.i +1/s*K i.i ) Obtaining d-axis voltage control information; wherein, K p.i Is the proportionality coefficient of the d-axis current PI controller; k is i.i Is the integral coefficient of the d-axis current PI controller.
q-axis current PI controller obtains q-axis reference current I q.ref And q-axis current I q And according to the calculation formula (I) q.ref －I q )*(K p.i +1/s*K i.i ) Obtaining q-axis voltage control information; wherein, K p.i Is the proportionality coefficient of the q-axis current PI controller; k is i.i Is an integral coefficient of a q-axis current PI controller, and q-axis reference current I q.ref Is 0.
The second conversion module is a dq/abc converter, acquires the d-axis voltage control information and the q-axis voltage control information, and further acquires a pre-feedback component U of the q-axis input voltage q And d-axis input voltage feed-forward component U d Respectively carrying out addition operation in a one-to-one correspondence manner; and then respectively associated with the above V sum And performing normalization processing, and generating an initial modulation signal through dq/abc transformation according to the phase angle theta.
A voltage balance module, specifically a bus voltage balance controller, for outputting a voltage difference V to the midpoint of the capacitor by sampling the voltage of the DC bus PM And the voltage difference V of the negative output of the point-to-bus voltage in the capacitor MN Calculating V PM －V MN Obtaining a voltage difference signal; after the voltage difference signal is regulated by the proportional regulator, the voltage compensation component of the initial modulation signal is obtained, the voltage on the series capacitor bank can be dynamically regulated, and the balance of the bus voltage is kept. Of course, the voltage difference signal can also be adjusted by a linear regulator, and the voltage compensation component can also be obtained.
And the harmonic injection module is used for adding an odd harmonic component, such as a third harmonic component, a fifth harmonic component or a seventh harmonic component, into the initial modulation signal aiming at the possible odd harmonic of the three-phase power supply, such as the 3 rd harmonic, the 5 th harmonic or the 7 th harmonic. The harmonic component compensation device is used for compensating harmonic components of an alternating current three-phase power grid, input current on the power grid side is made to be sinusoidal, and the total harmonic distortion rate iTHD of the current is reduced to be less than 5% so as to meet standard requirements. Wherein, the adjustment can be performed by a linear adjuster, which is not described herein again.
Referring to fig. 3, which is a current waveform diagram of an alternating three-phase power, a sinusoidal current is relatively clean, and iTHD is less than 5%.
And adding the voltage compensation component and the odd harmonic component into the initial modulation signal obtained by the second conversion module for superposition, and adjusting by using a proportional regulator, and adjusting by using a linear regulator, which are not described herein again.
After the initial modulation signal is subjected to the superposition compensation, amplitude limiting processing can be performed to obtain an output modulation signal and output the output modulation signal to the PWM generator module. Wherein outputting the modulated signal comprises: PWM _ CMD1, PWM _ CMD2, and PWM _ CMD3.
A PWM generator module, in particular a PWM module. A triangular carrier with switching frequency fsw is generated inside the three-phase PWM controller, the triangular carrier is overlapped with the three modulation signals of the output modulation signals, and PWM control signals PWM _ a _ R, PWM _ a _ L, PWM _ b _ R, PWM _ b _ L, PWM _ c _ R and PWM _ c _ L of corresponding channels are output through a comparator.
And the PWM control signal of the PWM generator module is output to the rectification module as a pulse width modulation control signal. The rectification module controls 2 MOSFETs of each back of the main power circuit according to the PWM control signal to realize AC-DC conversion of the main power circuit and obtain constant direct current output. Referring to FIG. 6, in one embodiment, the entire bus voltage V PM The constant output was 700V.
The beneficial effects that can be achieved by the above-mentioned embodiment are as follows:
1) The initial modulation signal cannot solve the problem that harmonic distortion rate is high and the problem that midpoint potential is unbalanced on the alternating current power grid side, and the embodiment compensates the third-order (or other odd-order, flexible control algorithm) harmonic influence and midpoint potential unbalance influence of the alternating current power grid by adding a compensation link equivalently through the links so as to solve the problem. On the basis of the voltage loop and current loop integral framework, a voltage balance control link and an odd harmonic injection link are added to an initial modulation signal, the output voltage balance problem is solved, power grid harmonics are suppressed, the output voltage is constant, the input current is sinusoidal, and the iTHD meets the power grid standard.
2) The three-phase PLL algorithm executed by the three-phase-locked loop module is controlled by software, can optimize a proportional-integral coefficient, is closed-loop control, can quickly lock a phase, and ensures accurate, simple and reliable phase information.
3) The voltage balance module is designed by adopting a proportional regulator, and the response speed is high.
In a word, the control loop of the three-phase rectification control device provided by the embodiment is simple, flexible and adjustable, product engineering is facilitated, the problem that the three-phase rectification control device cannot be produced due to complex algorithm is avoided, and the cost performance is high.
[ second embodiment ]
Referring to fig. 7, a three-phase rectification control method according to a second embodiment of the disclosure includes the following steps:
s10, acquiring alternating current three-phase power, and obtaining current information of the alternating current three-phase power through primary coordinate conversion; s20, rectifying the alternating current three-phase power according to a pulse width modulation control signal to obtain direct current output; s30, obtaining reference current information according to the voltage information of the direct current output; s40, obtaining voltage control information according to the reference current information and the current information, and obtaining an initial modulation signal after secondary coordinate conversion; and S50, superposing the initial modulation signal according to the voltage information of the direct current output and the odd harmonics to obtain an output modulation signal, and using the output modulation signal as the pulse width modulation control signal.
Wherein, the odd harmonics in S50 are third harmonics, fifth harmonics or seventh harmonics. For example, the initial modulation signal is superimposed according to the voltage information of the dc output and the third harmonic, so as to obtain an output modulation signal. The initial modulation signal cannot solve the problem that harmonic distortion rate occurring in the alternating current three phases is high and the problem that the midpoint potential of the direct current output is unbalanced, and the third harmonic is adopted as a compensation component of the initial modulation signal to solve the problems.
In S50, a proportional regulator is used for superposition, and an output modulation signal is finally obtained. A proportional regulator is directly adopted, so that the calculation can be accelerated, and the response speed is improved; and when the linear regulator is adopted for superposition, the calculation amount is large, and the time is long.
In the several embodiments provided in the present disclosure, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, a division of a unit is merely a division of one logic function, and an actual implementation may have another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may also be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present disclosure, not to limit it; although the present disclosure has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present disclosure.
Claims (10)
1. A three-phase commutation control device, comprising:
the rectification module is connected with the alternating current three-phase power and rectifies the alternating current three-phase power according to the pulse width modulation control signal to obtain direct current output;
the three-phase-locked loop module acquires phase information and voltage information of the alternating current three-phase power and acquires current information through the first conversion module;
the voltage control module is used for obtaining reference current information according to the voltage information of the direct current output;
the current control module is used for obtaining voltage control information according to the reference current information and the current information, and the voltage control information is converted into an initial modulation signal by a second conversion module;
the harmonic injection module outputs odd harmonics;
the voltage balancing module is used for superposing the initial modulation signal according to the voltage information of the direct current output and the odd harmonics to obtain an output modulation signal;
and the PWM generator module acquires the output modulation signal as the pulse width modulation control signal and outputs the output modulation signal to the rectification module.
2. The three-phase rectification control device of claim 1,
the harmonic injection module outputs third harmonic; and the voltage balancing module superposes the initial modulation signal according to the voltage information output by the direct current and the third harmonic to obtain an output modulation signal.
3. The three-phase rectification control device according to claim 1, wherein the current information includes a q-axis current and a d-axis current; the current control module includes: the device comprises a q-axis current control module and a d-axis current control module;
the two current control modules respectively obtain a q-axis voltage control signal and a d-axis voltage control signal through linear regulator operation according to respective current error signals of the q-axis current and the d-axis current;
and the second conversion module converts the two voltage control signals to obtain the initial modulation signal.
4. The three-phase commutation control device of claim 1, further comprising: the voltage balancer is connected to the direct current output to obtain a midpoint voltage;
and the voltage balancing module takes the midpoint voltage as the voltage information, and superposes the initial modulation signal according to the midpoint voltage and the odd harmonics to obtain an output modulation signal.
5. The three-phase commutation control device of claim 1, further comprising: the voltage balancer is connected to the direct current output to obtain a midpoint voltage; the reference current comprises q-axis reference current and d-axis reference current;
and the voltage control module is used for obtaining the d-axis reference current according to the midpoint voltage, and the q-axis reference current is set to be 0.
6. A three-phase commutation control device according to any one of claims 4 or 5, wherein the voltage balancer comprises two capacitors connected in series at the DC output, and the midpoint voltage is the voltage between the two capacitors.
7. The three-phase rectification control device of claim 1, wherein the voltage balancing module superimposes the initial modulation signal according to the odd harmonics through a proportional regulator operation.
8. A three-phase rectification control method, comprising:
acquiring alternating current three-phase power, and obtaining current information of the alternating current three-phase power through first coordinate conversion;
rectifying the alternating current three-phase power according to a pulse width modulation control signal to obtain direct current output;
obtaining reference current information according to the voltage information of the direct current output;
obtaining voltage control information according to the reference current information and the current information, and obtaining an initial modulation signal after secondary coordinate conversion;
and superposing the initial modulation signal according to the voltage information of the direct current output and odd harmonics to obtain an output modulation signal, and using the output modulation signal as the pulse width modulation control signal.
9. The three-phase rectification control method according to claim 8, wherein the odd-numbered subharmonic is a third harmonic, a fifth harmonic, or a seventh harmonic.
10. The three-phase rectification control method according to claim 8, wherein the initial modulation signal is superimposed according to the voltage information of the direct current output and odd harmonics, and the initial modulation signal is superimposed by adopting proportional regulator operation.
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