CN112217381A - Single-phase converter direct-current bus voltage secondary ripple suppression circuit and method - Google Patents
Single-phase converter direct-current bus voltage secondary ripple suppression circuit and method Download PDFInfo
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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
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Abstract
The invention discloses a circuit and a method for inhibiting secondary ripples of direct-current bus voltage of a single-phase converter, which are an optimized Active Power Filter (APF) circuit and a method.A secondary harmonic auxiliary absorption circuit is built on the converter and comprises two power switching devices, a switching device control unit, a filter inductor and a filter capacitor, wherein the switching device control unit comprises a sampling circuit, a conditioning circuit, a calculation circuit and a voltage control circuit.
Description
Technical Field
The invention belongs to the technical field of converter control, and particularly relates to a secondary ripple suppression circuit and a secondary ripple suppression method for a direct-current bus voltage of a single-phase converter.
Background
The existing methods for inhibiting double-frequency fluctuation of a direct-current bus of a single-phase converter are divided into a passive filtering method and an active filtering (APF) method, and three major categories of low-order harmonic of grid-connected current caused by voltage fluctuation of the direct-current bus are inhibited through a control strategy. The traditional passive filtering method directly connects a large capacitor or an LC resonance circuit in parallel at two ends of a direct current bus to inhibit direct current voltage pulsation, and the method needs very large capacitors and inductance values, so that the whole equipment has large volume, low power density and high manufacturing cost; the active filtering (APF) method is mainly characterized in that two or more fully-controlled power devices are added on the basis of the original single-phase PWM circuit, the complexity of the system is increased, the method needs to be further optimized, the cost is reduced, and the performance and the system stability are improved.
Disclosure of Invention
The invention provides a method for inhibiting secondary ripple of direct-current bus voltage of a single-phase converter, aiming at the problem of secondary component fluctuation of direct-current power of the single-phase converter, which specifically comprises the following steps:
step 1: a second harmonic auxiliary absorption circuit is built on the basis of the converter, and the circuit comprises a first power switch device, a second power switch device, a control unit, a filter inductor and a filter capacitor; the filter inductor and the filter capacitor are connected in series and then connected in parallel with the second power switch device;
step 2: a sampling circuit for controlling a secondary harmonic auxiliary absorption circuit is built, and the filter inductance voltage U in the circuit is obtainedL2And filtering the inductor current IL2Sampling, conditioning and transmitting to a controller;
and step 3: calculating and controlling capacitance C2End pressing:
step 301: collecting AC voltage UsAnd calculating the phase angle w;
step 302: set the appropriate Uc-dcAn instruction value;
step 303: calculating the effective values of the alternating input voltage and the current of the converter;
step 304: according to the phase angle w of the AC voltage, preset C2Voltage dc component Uc-dcInstruction value and Irms、UrmsSolving for C2Double frequency component U in end voltagec-2nd：
secondary harmonic auxiliary absorption circuit C2The end pressure expression of (1) is as follows:
and 4, step 4: design C2Voltage controller to realize UcAnd (5) controlling.
Step 401: the U calculated in step 304cTheoretical calculation value as U for system controlc2Command value U of voltagec2_refWill U isc2The difference is made between the instruction value and the actual sampling value;
step 402: will Uc2The difference between the instruction value and the actual sampling value is used as the input of the first PI controller and the first PR controller, and the sum of the output of the first PI controller and the output of the second PR controller is used as a capacitance current instruction Ic2_ref；
Step 403: the capacitor current is commanded toc2_refAnd the actual capacitance current Ic2Taking the difference as the input of a second PI controller and a second PR controller, and summing the output of the second PI controller and the output of the second PR controller;
step 404: and the sum of the outputs of the second PI controller and the second PR controller is used as a modulation wave generated by the PWM pulse to finally generate the PWM pulse, and a first power switch device and a second power switch device in the second harmonic auxiliary absorption circuit are controlled.
The invention also relates to a single-phase converter direct-current bus voltage secondary ripple suppression circuit, which comprises a secondary harmonic auxiliary absorption circuit, a first power switch device, a second power switch device, a control unit, a filter inductor and a filter capacitor, wherein the first power switch device and the second power switch device are respectively connected with the first power switch device and the second power switch device; the first power switch device is connected with the second power switch device in series, the other end of the first power switch device is connected with one end of the direct-current bus capacitor, the other end of the direct-current bus capacitor is connected with the other end of the second power switch device in series, and the filter inductor is connected with the filter capacitor in parallel after being connected with the second power switch device in series.
Further, the control unit comprises a first PI controller, a second PI controller, a first PR controller, a second PR controller, and a PWM generation module, wherein the first PI controller and the first PR controller are connected in parallel to form a first parallel circuit, the second PI controller and the second PR controller are connected in parallel to form a second parallel circuit, the first parallel circuit and the second parallel circuit are connected in series, the second parallel circuit is connected with the PWM generation module, and the PWM generation module is configured to generate PWM pulses for controlling the first power tube and the second power tube.
The invention realizes the following technical effects:
1. the invention can effectively inhibit the double frequency fluctuation of the DC bus voltage of the converter;
2. the invention only adds two power devices, one filter inductor and one filter capacitor, and has simple structure, simple system control method and easy engineering application compared with the traditional active filter circuit.
Drawings
FIG. 1 is a typical H-bridge PWM converter circuit;
fig. 2 is a prior art secondary ripple rejection circuit;
FIG. 3 illustrates a single-phase PWM converter and a double-frequency ripple suppression circuit thereof according to the present invention;
FIG. 4 is a block diagram of the converter double frequency ripple rejection control of the present invention;
fig. 5 shows a totem-pole converter and a circuit diagram for suppressing double frequency ripple of the totem-pole converter.
Detailed Description
The invention will be described in further detail below with reference to the following figures and specific examples:
fig. 1 shows a typical H-bridge PWM rectifier circuit in the prior art. When the voltage and current on the alternating current side of the single-phase converter fluctuate sinusoidally at the same frequency, secondary pulsating power with the same magnitude as the system power is generated, and the secondary pulsating power appears as a secondary voltage ripple on the direct current side. The sine variation expression of the alternating-current side voltage and current is as follows:
when the converter operates under an ideal unit power factor, the frequency of the switching tube is far greater than the frequency of a power grid, the loss and the on-off time of the switching tube are ignored, and the voltage and waveform expressions are assumed as follows:
in the formula of Urms，IrmsIs us，isEffective value of us，isFor ac voltage-current instantaneous value
The energy stored on the ac inductor is represented as:
the derivation yields the power on the inductor as:
PL＝-LIrms 2sin (2 ω t) (type 3)
Due to the instantaneous total power balance, the dc side instantaneous power can be expressed as:
from the above formula, when the single-phase converter operates at unity power factor, the dc power thereof consists of a dc component and a frequency-doubled component. The second harmonic component will reduce device lifetime and additionally cause low order harmonics in the ac current. Therefore, a suitable algorithm and topology need to be constructed to solve the problem.
The existing methods for secondary ripples of a direct-current bus of a single-phase converter are roughly classified into a passive filtering method and an active filtering (APF) method, and an energy storage element for compensating secondary ripple power can be a capacitor or an inductor.
FIG. 2 shows a prior art topology-secondary ripple rejection circuit of an active filter with two fully-controlled switch transistors S5And S6And two diodes D1And D2The circuit takes an inductor as an energy storage element to absorb and compensate secondary pulsating power input by the converter. In the circuit, the current in the inductor can only flow in a single direction, the magnetic core loss is large, the inductor current can sharply rise at the minimum value of the inductor current in the circuit, the value of the energy storage inductor cannot be too large in order to ensure that the inductor current has a large enough change rate to track the command current of the inductor current, but the value of the inductor cannot be too small, the amplitude of the inductor current can be increased due to the too small inductor current, the ripple of the inductor current can also be increased, and the current stress of the switching tube can also be large.
In order to solve the above problems, the present invention provides a circuit and a method for suppressing the second ripple of the dc bus voltage of a single-phase converter, in which a second harmonic auxiliary absorption circuit is built on the existing converter, and the absorption circuit includes a first power switch device S5And a second power switch device S6A control unit, a filter inductor L2A filter capacitor C2；
Wherein the first power switch device S5And a second power switch device S6Series, first power switching device S5The other end of the capacitor (C) and a DC bus capacitor (C)1Is connected to a DC bus capacitor C1And the other end of the first power switch device S6The other end of the series connection is connected with a filter inductor L2And a filter capacitor C2Connected in series with a second power switch device S6And (4) connecting in parallel.
The invention applies a Proportional Integral (PI) controller, because the PI regulator can not realize zero error tracking of an alternating current signal, and also applies a Proportional Resonance (PR) controller, and the system is controlled according to the proportion P and the resonance R of a feedback signal and a given deviation. Since the PR regulator has infinite gain at the corresponding resonance point, the dc-side voltage can be made to have no steady-state error with respect to a given voltage at the corresponding frequency.
Furthermore, the method for inhibiting the secondary ripple of the direct current bus voltage of the single-phase converter provided by the invention is characterized in that the filtering inductance voltage U in the circuit is filtered by building a sampling circuit for controlling a secondary harmonic auxiliary absorption circuitL2And filtering the inductor current IL2Sampling, conditioning and transmitting to a controller;
collecting AC voltage UsAnd calculating the phase angle w;
set the appropriate Uc-dcAn instruction value;
calculating the effective values of the alternating input voltage and the current of the converter;
according to the phase angle w of the AC voltage, preset C2Voltage dc component Uc-dcInstruction value and Irms、UrmsSolving for C2Double frequency component U in end voltagec-2nd：
In auxiliary circuit C2The end pressure expression of (1) is as follows:
u calculated in the above formulacTheoretical calculation value as U for system controlc2Command value U of voltagec2_refWill U isc2The difference is taken as the input of the first PI controller and the first PR controller, and the sum of the output of the first PI controller and the output of the first PR controller is taken as a capacitance current instruction Ic2_refWherein the first PI controlsConstructing the composite controller to realize the outer loop control function of the auxiliary loop voltage by using the direct current component in the controller control instruction and the alternating current component in the first PR controller control instruction;
the capacitor current is commanded toc2_refAnd the actual capacitance current Ic2After difference is made, the difference is used as the input of a second PI controller and a second PR controller, the sum of the outputs of the second PI controller and the second PR controller is used as a modulation wave generated by a PWM pulse to finally generate the PWM pulse, and a first power switching device and a second power switching device in a secondary harmonic auxiliary absorption circuit are controlled to realize UcAnd (5) controlling.
The invention also relates to a single-phase converter direct-current bus voltage secondary ripple suppression circuit which comprises a secondary harmonic auxiliary absorption circuit, specifically comprises a first power switch device, a second power switch device, a control unit, a filter inductor and a filter capacitor.
Further, the control unit comprises a first PI controller, a second PI controller, a first PR controller, a second PR controller, and a PWM generation module, wherein the first PI controller and the first PR controller are connected in parallel to form a first parallel circuit, the second PI controller and the second PR controller are connected in parallel to form a second parallel circuit, the first parallel circuit and the second parallel circuit are connected in series, the second parallel circuit is connected with the PWM generation module, and the PWM generation module is configured to generate PWM pulses for controlling the first power tube and the second power tube.
To make the DC bus capacitor c1The upper voltage is stable without double frequency fluctuation, i.e. double frequency power, so that the auxiliary L of the structure2C2The loop absorbs double frequency power input by the alternating current side. When C is present2Voltage at both ends is Uc-dc+Uc-2ndWhen the current includes DC component and two frequency multiplication component, the current only contains two frequency multiplication component, so that the inductor L2On the filter capacitor C with quadruple frequency power2The upper current is the quadruple frequency power and the double frequency power. By setting appropriate filter capacitors C2The voltage value at both ends can ensure the filter capacitor C2And a filter inductor L2The quadruple frequency component on the harmonic suppression device is very small, and the system harmonic is satisfiedWave requirements.
The circuit and the method for suppressing the secondary ripple of the direct-current bus voltage of the single-phase converter are also applicable to single-phase converters with other topologies, such as totem-pole topology, and as shown in fig. 5, the circuit and the method for suppressing the secondary ripple of the direct-current bus voltage are applied to a circuit diagram of the totem-pole converter. The design of the DC bus voltage secondary ripple suppression controller is shown in FIG. 4.
Finally, it should be noted that the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and those skilled in the art who read the present application can make various modifications or alterations of the present invention by referring to the above-mentioned embodiments within the scope of the claims of the present application.
Claims (5)
1. A method for inhibiting secondary ripples of a direct-current bus voltage of a single-phase converter is characterized by comprising the following steps:
step 1: a second harmonic auxiliary absorption circuit is built on the converter and comprises a first power switch device, a second power switch device, a control unit, a filter inductor and a filter capacitor; the filter inductor and the filter capacitor are connected in series and then connected in parallel with the second power switch device;
step 2: voltage U to filter inductanceL2And current I of filter inductorL2Sampling, conditioning and transmitting to a control unit;
and step 3: calculating and controlling the terminal voltage of the filter capacitor:
and 4, step 4: and (3) outputting a PWM control signal by using the terminal voltage of the filter capacitor, the sampling voltage value of the filter capacitor and the sampling current value of the filter capacitor calculated in the step (3) for controlling the first power switch device and the second power switch device in the step (1).
2. The control method according to claim 1, wherein step 3 further comprises the steps of:
step 301: collecting AC voltage UsAnd calculating the phase angle w;
step 302: setting proper filter capacitor voltage direct-current component instruction value Uc-dc；
Step 303: calculating the effective values of the alternating input voltage and the current of the converter;
step 304: according to the AC voltage phase angle w, the preset DC component U of the filter capacitor voltagec-dcInstruction value and Irms、UrmsSolving the double frequency component U in the filter capacitor terminal voltagec-2nd：
the terminal voltage expression of the filter capacitor in the secondary harmonic auxiliary absorption circuit is as follows:
3. the control method according to claim 2, wherein step 4 further comprises the step of,
step 401: the U calculated in step 304cThe theoretical calculation value is used as a command value U of terminal voltage of a system control filter capacitorc2_refMaking a difference between the instruction value of the terminal voltage of the filter capacitor and the actual sampling value;
step 402: filtering capacitor voltage Uc2The difference between the instruction value and the actual sampling value is used as the input of the first PI controller and the first PR controller, and the sum of the output of the first PI controller and the output of the first PR controller is used as the instruction I of the capacitance currentc2_ref；
Step 403: current instruction I of filter capacitorc2_refAnd the actual capacitance current Ic2Taking the difference as the input of a second PI controller and a second PR controller, and summing the output of the second PI controller and the output of the second PR controller;
step 404: and the sum of the outputs of the second PI controller and the second PR controller is used as a modulation wave generated by the PWM pulse to finally generate the PWM pulse, and a first power switch device and a second power switch device in the second harmonic auxiliary absorption circuit are controlled.
4. A single-phase converter direct current bus voltage secondary ripple suppression circuit is characterized by comprising a secondary harmonic auxiliary absorption circuit, wherein the secondary harmonic auxiliary absorption circuit comprises a first power switch device, a second power switch device, a control unit, a filter inductor and a filter capacitor; the first power switch device is connected with the second power switch device in series, the other end of the first power switch device is connected with one end of the direct-current bus capacitor, the other end of the direct-current bus capacitor is connected with the other end of the second power switch device in series, and the filter inductor is connected with the filter capacitor in parallel after being connected with the second power switch device in series.
5. The control circuit of claim 4, wherein the control unit comprises a first PI controller, a second PI controller, a first PR controller, a second PR controller, and a PWM generation module, wherein the first PI controller and the first PR controller are connected in parallel to form a first parallel circuit, the second PI controller and the second PR controller are connected in parallel to form a second parallel circuit, the first parallel circuit and the second parallel circuit are connected in series, the second parallel circuit is connected with the PWM generation module, and the PWM generation module is configured to generate PWM pulses for controlling the first power tube and the second power tube.
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Cited By (2)
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| CN113098421A (en) * | 2021-04-01 | 2021-07-09 | 中国矿业大学 | Method for suppressing low-frequency ripple of direct-current side voltage of parallel active power filter |
| CN113726199A (en) * | 2021-09-03 | 2021-11-30 | 安徽工业大学 | Low-output ripple boost rectifier and control method thereof |
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Effective date of registration: 20240318 Address after: Room B4, 9 / F, Cuiting building, No.1, middle section of Xingqing Road, Beilin District, Xi'an, Shaanxi 710000 Patentee after: Xi'an Yuneng Power Equipment Co.,Ltd. Country or region after: China Address before: No.5 Dongfeng Road, Jinshui District, Zhengzhou City, Henan Province Patentee before: Zhengzhou University of light industry Country or region before: China |