CN103684008A - Control method of current hysteresis inverter - Google Patents

Control method of current hysteresis inverter Download PDF

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Publication number
CN103684008A
CN103684008A CN201310686857.9A CN201310686857A CN103684008A CN 103684008 A CN103684008 A CN 103684008A CN 201310686857 A CN201310686857 A CN 201310686857A CN 103684008 A CN103684008 A CN 103684008A
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limit
current
stagnant ring
make
brachium pontis
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CN201310686857.9A
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Chinese (zh)
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CN103684008B (en
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胡存刚
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安徽大学
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Abstract

The invention discloses a control method of a current hysteresis inverter. The control method of the current hysteresis inverter comprises the step of setting a hysteresis upper limit and a hysteresis lower limit, and is characterized in that a middle threshold value is added between the hysteresis upper limit and the hysteresis lower limit, control in a positive state, a negative state and a zero state is achieved in a half cycle, and therefore the control accuracy and stability of a system is improved, and meanwhile current ripples are lowered.

Description

A kind of Hysteresis Current inverter control method
Technical field
The present invention relates to a kind of electric equipment control method, particularly a kind of Hysteresis Current inverter control method.
Background technology
Inverter is that direct current energy (battery, accumulator jar) is transformed into alternating current (being generally 220v50HZ sine or square wave).Popular says, inverter is a kind of device that direct current (DC) is converted into alternating current (AC).It is comprised of inverter bridge, control logic and filter circuit.
As shown in Figure 1, at present, the control method of common Hysteresis Current control inverter is mainly binary states Hysteresis Current inverter and tri-state Hysteresis Current inverter:
The stagnant ring of binary states is controlled: only have the stagnant ring upper limit, stagnant ring lower limit.When actual current is greater than the stagnant ring upper limit, make two brachium pontis mid-point voltages poor for negative, make current reduction; When actual current is reduced to, be less than stagnant ring lower limit, make two brachium pontis mid-point voltages poor for just, make Current rise.Positive half period two bridge arm voltages are poor can, for just, be born; Negative half period can, for just, be born; Complete period is for just, negative.
The stagnant ring of tri-state is controlled: only have the stagnant ring upper limit, stagnant ring lower limit.At positive half cycle, when actual current is greater than the stagnant ring upper limit, making two brachium pontis mid-point voltages poor is zero, makes current reduction; When actual current is reduced to, be less than stagnant ring lower limit, make two brachium pontis mid-point voltages poor for just, make Current rise.At negative half period, when actual current is greater than the stagnant ring upper limit, make two brachium pontis mid-point voltages poor for negative, make current reduction; When actual current is reduced to, be less than stagnant ring lower limit, making two brachium pontis mid-point voltages poor is zero, makes Current rise.Positive half period two bridge arm voltages are poor can be for just, and zero; Negative half period can be zero, negative; Complete period is for just, negative, and zero.
Two brachium pontis mid-point voltages of inverter that the stagnant ring of binary states is controlled are poor non-just negative, only have two states; And the inverter of the stagnant ring of tri-state modulation at positive half period two brachium pontis mid-point voltages for just or zero, negative half brachium pontis mid-point voltage is for negative or zero, little when in the situation that of same switch frequency, current pulsation is than binary states, and has less current ripples.Under the stagnant ring of tri-state is controlled, zero crossing place easily produces imbalance, and effect is controlled in impact, for the stability of system has been brought adverse influence.
Therefore, need to improve existing Hysteresis Current inverter, reduce current ripple, improve its current stability, reduce the infringement to circuit, electronic devices and components.
Summary of the invention
Goal of the invention of the present invention is: for the problem of above-mentioned existence, a kind of Hysteresis Current inverter control method is provided, this control method not only makes switching frequency requirement lower, and has solved well zero crossing imbalance, has guaranteed high efficiency and the stability of system.
The technical solution used in the present invention is such:
A Hysteresis Current inverter control method, comprises the stagnant ring upper limit and stagnant ring lower limit is set, and it is characterized in that: threshold value increase by between the stagnant ring upper limit and stagnant ring lower limit in the middle of.
Further, in positive half period, comprise the following steps:
A. when actual current is less than stagnant ring lower limit, make two brachium pontis mid-point voltages poor for just, make Current rise;
B. when actual current is greater than the stagnant ring upper limit, make two brachium pontis mid-point voltages poor for negative, electric current is declined rapidly;
C. when actual current is less than upper threshold and be greater than under threshold value in limited time, making two brachium pontis mid-point voltages poor is zero, makes electric current slow decreasing;
D. when actual current is less than threshold value lower limit, make two brachium pontis mid-point voltages poor for negative, electric current is declined rapidly;
In negative half-cycle, comprise the steps:
A) when actual current is greater than the stagnant ring upper limit, make two brachium pontis mid-point voltages poor for negative, electric current is declined;
B) when actual current is less than stagnant ring lower limit, make two brachium pontis mid-point voltages poor for just, make electric current increase rapidly;
C), when actual current is greater than threshold value lower limit and is less than upper threshold, making two brachium pontis mid-point voltages poor is zero, makes electric current rising;
D) when actual current is greater than upper threshold, make two brachium pontis mid-point voltages poor for just, make electric current increase rapidly.
Further, described threshold values is adjustable, and within its adjustable range is limited to the scope of the stagnant ring upper limit and stagnant ring lower limit defined.
In sum, owing to having adopted technique scheme, the invention has the beneficial effects as follows:
1, can, when reducing the required switching frequency of inversion, reduce ripple current;
2, improve system control precision and control stability, and solve zero crossing imbalance.
Accompanying drawing explanation
Fig. 1 is prior art Hysteresis Current inverter control figure.
Fig. 2 is Hysteresis Current inverter control figure of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 2, a kind of Hysteresis Current inverter control method, comprises the stagnant ring upper limit and stagnant ring lower limit is set, and increases a middle threshold value between the stagnant ring upper limit and stagnant ring lower limit.
During work, in positive half period, comprise the following steps:
A. when actual current is less than stagnant ring lower limit, make two brachium pontis mid-point voltages poor for just, make Current rise;
B. when actual current is greater than the stagnant ring upper limit, make two brachium pontis mid-point voltages poor for negative, electric current is declined rapidly;
C. when actual current is less than upper threshold and be greater than under threshold value in limited time, making two brachium pontis mid-point voltages poor is zero, makes electric current slow decreasing;
D. when actual current is less than threshold value lower limit, make two brachium pontis mid-point voltages poor for negative, electric current is declined rapidly;
In negative half-cycle, comprise the steps:
E) when actual current is greater than the stagnant ring upper limit, make two brachium pontis mid-point voltages poor for negative, electric current is declined;
F) when actual current is less than stagnant ring lower limit, make two brachium pontis mid-point voltages poor for just, make electric current increase rapidly;
G), when actual current is greater than threshold value lower limit and is less than upper threshold, making two brachium pontis mid-point voltages poor is zero, makes electric current rising;
H) when actual current is greater than upper threshold, make two brachium pontis mid-point voltages poor for just, make electric current increase rapidly.
Described threshold values is adjustable, and within its adjustable range is limited to the scope of the stagnant ring upper limit and stagnant ring lower limit defined.
Except above-mentioned link, also need to add link of protection and fault recovery unit to guarantee system safety stable operation.
Hardware components is a full-bridge inverter topology, mainly by DC side power supply, circuit breaker, inverter bridge, output filter, finally enter electrical network, wherein DSP is responsible for grid-connected electric current and voltage to sample, and sends pwm control signal and be operated in desired state through overdrive circuit driving switch pipe.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.

Claims (3)

1. a Hysteresis Current inverter control method, comprises the stagnant ring upper limit and stagnant ring lower limit is set, and it is characterized in that: threshold value increase by between the stagnant ring upper limit and stagnant ring lower limit in the middle of.
2. control method according to claim 1, is characterized in that: in positive half period, comprise the following steps:
A. when actual current is less than stagnant ring lower limit, make two brachium pontis mid-point voltages poor for just, make Current rise;
B. when actual current is greater than the stagnant ring upper limit, make two brachium pontis mid-point voltages poor for negative, electric current is declined rapidly;
C. when actual current is less than upper threshold and be greater than under threshold value in limited time, making two brachium pontis mid-point voltages poor is zero, makes electric current slow decreasing;
D. when actual current is less than threshold value lower limit, make two brachium pontis mid-point voltages poor for negative, electric current is declined rapidly;
In negative half-cycle, comprise the steps:
A) when actual current is greater than the stagnant ring upper limit, make two brachium pontis mid-point voltages poor for negative, electric current is declined;
B) when actual current is less than stagnant ring lower limit, make two brachium pontis mid-point voltages poor for just, make electric current increase rapidly;
C), when actual current is greater than threshold value lower limit and is less than upper threshold, making two brachium pontis mid-point voltages poor is zero, makes electric current rising;
D) when actual current is greater than upper threshold, make two brachium pontis mid-point voltages poor for just, make electric current increase rapidly.
3. control method according to claim 1, is characterized in that: described threshold values is adjustable, and within its adjustable range is limited to the scope of the stagnant ring upper limit and stagnant ring lower limit defined.
CN201310686857.9A 2013-12-13 2013-12-13 A kind of Hysteresis Current inverter control method Active CN103684008B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10897241B2 (en) 2019-01-16 2021-01-19 Delta Electronics (Shanghai) Co., Ltd. Hysteresis control method for inverter and an inverter with hysteresis control

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1449102A (en) * 2003-05-12 2003-10-15 南京航空航天大学 Main circuit topology of tri-electrical-level double-dropping type semi-bridge inverter and control method thereof
CN103186152A (en) * 2011-12-29 2013-07-03 比亚迪股份有限公司 Hysteresis comparison control method
CN103280808A (en) * 2013-06-08 2013-09-04 南京因泰莱电器股份有限公司 Variable ring width hysteresis current control method based on timer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1449102A (en) * 2003-05-12 2003-10-15 南京航空航天大学 Main circuit topology of tri-electrical-level double-dropping type semi-bridge inverter and control method thereof
CN103186152A (en) * 2011-12-29 2013-07-03 比亚迪股份有限公司 Hysteresis comparison control method
CN103280808A (en) * 2013-06-08 2013-09-04 南京因泰莱电器股份有限公司 Variable ring width hysteresis current control method based on timer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10897241B2 (en) 2019-01-16 2021-01-19 Delta Electronics (Shanghai) Co., Ltd. Hysteresis control method for inverter and an inverter with hysteresis control

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