CN111478567B - Cascade H-bridge rectifier bias component and fundamental component injection voltage-sharing method - Google Patents

Cascade H-bridge rectifier bias component and fundamental component injection voltage-sharing method Download PDF

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CN111478567B
CN111478567B CN202010169760.0A CN202010169760A CN111478567B CN 111478567 B CN111478567 B CN 111478567B CN 202010169760 A CN202010169760 A CN 202010169760A CN 111478567 B CN111478567 B CN 111478567B
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voltage
component
calculating
bias
sharing
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CN111478567A (en
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李金玉
龚春英
陈杰
邰伟宇
袁牧琳
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Nanjing University of Aeronautics and Astronautics
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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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc 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
    • H02M7/217—Conversion of ac power input into dc 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
    • H02M7/219—Conversion of ac power input into dc 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 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc 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
    • H02M7/217—Conversion of ac power input into dc 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
    • H02M7/25—Conversion of ac power input into dc 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 arranged for operation in series, e.g. for multiplication of voltage
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention discloses a method for injecting bias components and fundamental wave components into a cascade H-bridge rectifier to equalize voltage, which comprises the following steps: sampling an input voltage and current; calculating a bias voltage; calculating a fundamental component; calculating the difference between the bias component and the fundamental component; the modulated wave voltage-sharing component is calculated. The method can still keep voltage sharing of each path of voltage when the power of each module of the cascaded H bridge is large and unbalanced, can overcome the defect that a fundamental wave balancing method cannot realize voltage sharing under special conditions under the condition of light load, and has the advantages of high adjusting speed, small error, higher modulation ratio and more prominent advantages. When the number of cascaded modules is large, the control method can realize capacitor voltage balance even if one module outputs no load, has the characteristic of fault tolerance, is favorable for improving the reliability of a system, and can be realized by using an analog circuit.

Description

Cascade H-bridge rectifier bias component and fundamental component injection voltage-sharing method
Technical Field
The invention relates to the technical field of cascaded H-bridge rectifiers, in particular to a method for injecting bias components and fundamental component voltage-sharing of a cascaded H-bridge rectifier.
Background
The application of power electronic technology can greatly improve the power density of the electric energy conversion device and reduce the volume and the weight. With the development of multi-electric and all-electric airplanes, the electricity consumption of the airplanes is continuously increased, and the number of airborne power electronic equipment is increased, so that higher requirements are provided for the reliability, maintainability and testability of an airborne power electronic conversion device. The cascaded H-bridge rectifier can be applied to an aviation rectifier or a power electronic transformer. Voltage-sharing control is needed between every two modules of the cascaded H-bridge rectifier, and when an overvoltage problem occurs, a power device is burnt out, so that a voltage-sharing method is provided.
Disclosure of Invention
The invention aims to provide a method for injecting bias components and fundamental wave components into a cascaded H-bridge rectifier to equalize the voltage of output voltages of the cascaded H-bridge rectifier.
The invention adopts the following technical scheme for solving the technical problems:
a cascade H-bridge rectifier bias component and fundamental component injection voltage-sharing method comprises the following steps:
A. sampling an input voltage;
B. calculating a bias voltage component;
C. calculating a sinusoidal fundamental component;
D. calculating the difference between the bias component and the fundamental component;
E. the modulated wave voltage-sharing component is calculated.
Further, the calculation formula of the offset voltage ofs in step B is as follows:
Figure BDA0002408775490000011
uifor input voltage, UmRated input voltage peak value, k is bias adjustment coefficient, 2<k<5。
Furthermore, in the step C, the sine fundamental wave component sw is a ratio of an input voltage to a given value of the sum of all the module output direct current voltages, and sw is equal to ui/Udc *，Udc *The output voltage is given.
Further, the formula of the sinusoidal fundamental wave component osw in step C is: osw ═ osf-sw.
Further, the step of calculating the modulation wave voltage-sharing component in step E includes:
step 1: calculating voltage-sharing component delta u in each H-bridge modulation wavei
Figure BDA0002408775490000021
ubiAs output value of the grading ring, Δ uiModulating a voltage-sharing component in the wave for each H-bridge;
step 2：ΔuiAnd the total modulation wave output by the current loop is added to obtain the modulation wave of each module.
Compared with the prior art, the invention adopting the technical scheme has the following technical advantages: the method has the advantages of good balancing capability and protection capability in light load, expanded voltage balancing range, high adjusting speed and small adjusting error, and when a certain path has no load in multi-module work, the novel method can still work to realize no-load fault-tolerant control. Based on these advantages, the new method can improve the system security.
Drawings
FIG. 1 is a schematic diagram of a cascaded H-bridge rectifier;
FIG. 2 is a control block diagram of the voltage-sharing method;
FIG. 3 is a flow chart of the implementation of the voltage-sharing method;
wherein: u. ofi-ac input voltage, L, Rs-ac inductance and equivalent series resistance, uL-inductor voltage; udc1, udc2, …, udcn-n independent direct current output voltages at the direct current side, Ti 1-Ti 4-4 switching tubes of the ith H-bridge unit, Ci, Ri-output capacitance and load resistance of the ith unit, ofs-bias voltage, Udc *Output voltage setpoint, sw (sine wave) -ratio of input voltage to output voltage, ubiOutput value of equalizer ring, Δ ui-a voltage grading component in each H-bridge modulated wave.
Fig. 1 shows a cascade H-bridge circuit, which may be suitable for use in applications such as rectification, solid-state transformers, and cascade photovoltaic inversion. The composition of the single H-bridge is: the drains of Ti1 and Ti3 are connected to form a single-module direct current port A, the sources of Ti2 and Ti3 are connected to form a single-module direct current port B, the source of Ti1 and the drain of Ti2 are connected to form a single-module alternating current port C, and the source of Ti3 and the drain of Ti4 are connected to form a single-module alternating current port D. The cascade H-bridge direct current ports are mutually independent, the alternating current ports are mutually connected in series to form n direct current ports and an alternating current end, and in the rectifying circuit, the alternating current port, the inductor and the alternating current input voltage are sequentially connected in series. And the capacitor, the load and the direct current port of each module are connected in parallel.
Detailed Description
The invention provides a method for injecting and equalizing voltage of an offset component and a fundamental component of a cascaded H-bridge rectifier, which aims to make the purpose, technical scheme and effect of the invention clearer and further elaborates the invention by referring to the attached drawings and taking examples as examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The workflow is described in detail below.
A cascade H-bridge rectifier bias component and fundamental component injection voltage-sharing method comprises the following steps:
firstly, data acquisition;
secondly, calculating bias voltage;
thirdly, calculating a fundamental component;
fourthly, calculating the difference between the offset component and the fundamental component;
and fifthly, calculating the voltage-sharing component of the modulated wave.
In FIG. 3, uiFor input voltage, UmFor the nominal input voltage peak, ofs is the bias voltage. U shapedcTo output a voltage, Udc *The output voltage is given. sw is the ratio of the input voltage to the given value of the sum of all module output direct current voltages, osf subtracts sw to obtain osw (offset and sine wave) containing an offset voltage component and a sine fundamental wave component.
Figure BDA0002408775490000031
In ofs, 2< k <5, here the typical value 3 is taken.
sw＝ui/Udc *；
osw＝osf–sw；
As shown in FIG. 2, udciAverage value of (1) and udciThe difference is adjusted by PI to obtain ubiAs the amplitude of the grading ring, ubiThe voltage-sharing component, Δ u, is obtained after multiplication by oswiFor each oneThe voltage equalizing component in the H-bridge modulated wave.
Figure BDA0002408775490000032
ΔuiAnd the total modulation wave (common modulation wave) of the current inner loop is added to obtain the modulation wave of each module. The voltage-sharing component of the last module is the opposite number of the sum of the voltage-sharing components of the first n-1 modules.
In the control of a cascade rectifier (such as a solid-state transformer), a voltage outer ring controls direct-current voltage, a current inner ring controls inductive current, so that the inductive current and input voltage are in the same frequency and phase, a converter works in a unit power factor, the voltage outer ring obtains a current amplitude given value, and the current inner ring is responsible for inductive current control, so that a common modulation wave can be obtained. The common modulation wave cannot control the balance of the direct-current voltage, a voltage-sharing component needs to be superposed, and the voltage-sharing component solving method provided by the document can improve the voltage-sharing range or the active power redistribution capability.

Claims (1)

1. A cascade H bridge rectifier bias component and fundamental component injection voltage-sharing method is characterized by comprising the following steps:
A. sampling an input voltage;
B. calculating a bias voltage component;
C. calculating a sinusoidal fundamental component;
D. calculating the difference between the bias component and the fundamental component;
E. calculating a modulation wave voltage-sharing component;
the calculation method of the bias voltage ofs in the step B is as follows:
Figure FDA0003527313560000011
uifor input voltage, UmIs a rated input voltage peak value, and k is a bias adjustment coefficient;
2<k<5；
in the step C, the sine fundamental wave component sw is the ratio of the given values of the input voltage and the output voltage, and sw is equal to ui/Udc *，Udc *Setting a given value for the output voltage;
the calculation formula of the difference osw between the bias component and the fundamental component in step D is: osw ═ osf-sw;
the step of calculating the modulation wave equalizer component in step E includes:
step 1: calculating voltage-sharing component Deltau in each H-bridge modulation wavei
Figure FDA0003527313560000012
ubiAs output value of the grading ring, Δ uiFor the voltage-sharing component in each H-bridge modulation wave, n is the number of H-bridges;
step 2: Δ uiAnd the total modulation wave output by the current loop is added to obtain the modulation wave of each H bridge.
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CN101741274A (en) * 2009-12-15 2010-06-16 哈尔滨工业大学 Modulation method and implementation circuit for unit vector to carrying out time-delay superimposition of multi-level space vector
CN103929045A (en) * 2013-01-16 2014-07-16 通用电气能源电能变换科技有限公司 Converter device, drive unit and correlation method
CN108768191A (en) * 2018-07-10 2018-11-06 南京工业大学 A kind of control method that single-phase multi-module cascade solid-state transformer rectification stage is pressed

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CN104836463B (en) * 2015-04-30 2018-01-05 华南理工大学 Mixing transformation system based on three-phase PWM rectification Yu multiple-unit uncontrollable rectifier

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Publication number Priority date Publication date Assignee Title
CN101741274A (en) * 2009-12-15 2010-06-16 哈尔滨工业大学 Modulation method and implementation circuit for unit vector to carrying out time-delay superimposition of multi-level space vector
CN103929045A (en) * 2013-01-16 2014-07-16 通用电气能源电能变换科技有限公司 Converter device, drive unit and correlation method
CN108768191A (en) * 2018-07-10 2018-11-06 南京工业大学 A kind of control method that single-phase multi-module cascade solid-state transformer rectification stage is pressed

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