CN208707520U - DC bus ripple compensation device - Google Patents
DC bus ripple compensation device Download PDFInfo
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- CN208707520U CN208707520U CN201821204324.7U CN201821204324U CN208707520U CN 208707520 U CN208707520 U CN 208707520U CN 201821204324 U CN201821204324 U CN 201821204324U CN 208707520 U CN208707520 U CN 208707520U
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Abstract
The utility model provides a kind of DC bus ripple compensation device, it includes AC/DC, multiple groups DC/DC and corresponding load, first capacitor (C1), second capacitor (C2), inductance (L), first power switch tube (S1), second power switch tube (S2), first current sensor (Ia), second current sensor (Ib), control circuit, control circuit passes through control the first power switch tube (S1), the conducting and shutdown of second power switch tube (S2), to realize DC bus ripple compensation function, it is capable of the voltage value of stable high voltage lateral capacitance simultaneously；By the compensation to high voltage dc bus ripple current, make the voltage and current DC quantity of DC bus, ripple content is very small, reduces system loss, extends the service life of capacitor, guarantees that rear class DC/DC converter output voltage current precision is sufficiently high.The utility model can be widely applied to DC ripple compensation device technical field.
Description
Technical field
The utility model relates to electronic power convertor more particularly to a kind of devices for DC bus ripple compensation.
Background technique
In intelligent power battery performance detection device, contain AC/DC and DC/DC 2 stage converter, the ripple of DC bus
It is mainly derived from AC/DC converter, in AC/DC converter, when alternating voltage is in zero crossing, the instantaneous power for exchanging side is remote
Less than the power of DC side；When alternating voltage is in wave crest or wave trough position, the instantaneous power for exchanging side is much larger than DC side
Power.Due to exchange side power and DC side power can not real-time matching, cause DC bus generate ripple.It is smaller when loading
When, the voltage and current ripple of DC bus be it is very small, when load become weight when, the ripple of bus will become larger, if the electricity of bus
When flow liner wave number is greater than certain value, the voltage and current ripple that will lead to the output of rear class DC/DC variator is big, to make output accuracy
It is deteriorated, is unable to satisfy expected requirement.
In order to avoid above situation, when existing skill cardia DC bus ripple problem, be in DC bus simultaneously
Join more capacitors, makes DC bus ripple control in claimed range.Since capacitor volume itself is big and weight weight, increase female
Line capacitance can be such that cost sharply increases, and device volume and weight all increase.It is thus highly desirable to develop a kind of at low cost, body
Product voltage and current DC quantity that is small, making DC bus, the very small device for DC bus ripple compensation of ripple content.
Compensation to high voltage dc bus ripple current, makes the voltage and current DC quantity of DC bus, and ripple content is non-
It is often small, system loss is reduced, the service life of capacitor is extended, guarantees rear class DC/DC converter output voltage current precision
It is sufficiently high.
Utility model content
It is to be solved in the utility model ask mention be overcome the deficiencies of the prior art and provide it is a kind of it is at low cost, small in size, make
The voltage and current of DC bus is DC quantity, the very small DC bus ripple compensation device of ripple content.
The technical solution of the utility model is: a kind of DC bus ripple compensation device, it includes AC/DC, multiple groups DC/DC
And corresponding multiple groups load, the output end of the multiple groups DC/DC are separately connected the corresponding multiple groups load, the multiple groups DC/
The DC output end of the AC/DC, the exchange input of the AC/DC are connected after the input terminal of DC is in parallel using high voltage dc bus
End is connect with AC power source, it further includes first capacitor, the second capacitor, inductance, the first power switch tube, the second power switch
Pipe, the first current sensor, the second current sensor, control circuit, the both ends of the first capacitor are separately connected described first
The emitter of the collector of power switch tube and second power switch tube, the emitter of first power switch tube and institute
The collector for stating the second power switch tube is connected and connects one end of the inductance, the other end connection of the inductance described the
The anode of the AC/DC high voltage dc bus is connected behind one end of two capacitors using high voltage dc bus, second capacitor
The direct current output negative terminal of the AC/DC is connected after the emitter of other end connection power switch tube S 2 using high voltage dc bus,
It is female that first current sensor acquires the direct current that second capacitor is connected with the anode of the AC/DC high voltage dc bus
Output electric current on line, second current sensor acquire the DC output end of the AC/DC to the defeated of the multiple groups DC/DC
The current signal that electric current out, first current sensor and second current sensor acquire is connected to the control electricity
Road.
The control circuit includes iir filter, PWM wave generator, PI controller, repetitive controller, multiple comparators,
Corresponding adaptation couples and connects between the iir filter, PWM wave generator, PI controller, repetitive controller, multiple comparators
First current sensor, second current sensor, first current sensor, second current sensor will
It samples obtained DC bus current value and is input to the iir filter, DC bus current is calculated by iir filter
Average value, current value, which subtracts this average value, can be obtained DC bus current ripple component, by this ripple component negate gained
Compensation current error value of the value as the present apparatus, send the compensation current error value in repetitive controller, pass through weight
Compensation current is calculated in multiple controller, compensation current is introduced the corresponding comparator add deduct and be calculated pair
Answer given value, the corresponding given value participates in controlling first power switch tube, the second power switch tube in control circuit
Duty ratio, first power switch tube, the second power switch tube are complementary conduction mode work, and the duty ratio is sent to institute
State in PWM wave generator, the PWM wave generator control first power switch tube, the second power switch tube conducting with
Shutdown, to realize DC bus ripple compensation function, while capableing of the voltage value of stable high voltage lateral capacitance.
The beneficial effects of the utility model are: since the utility model includes first capacitor, the second capacitor, inductance, first
Power switch tube, the second power switch tube, the first current sensor, the second current sensor, control circuit, the first capacitor
Both ends be separately connected the collector of first power switch tube and the emitter of second power switch tube, described first
The emitter of power switch tube is connected with the collector of second power switch tube and connects one end of the inductance, described
The other end of inductance connects and connects the AC/DC high voltage dc bus using high voltage dc bus behind one end of second capacitor
Anode, second capacitor the other end connection power switch tube S 2 emitter after using high voltage dc bus connection described in
The direct current output negative terminal of AC/DC, first current sensor acquire second capacitor and the AC/DC high voltage dc bus
The DC bus that is connected of anode on output electric current, second current sensor acquires the direct current output of the AC/DC
Hold the output electric current to the multiple groups DC/DC, the electricity that first current sensor and second current sensor acquire
Stream signal is connected to the control circuit.The control circuit is by controlling first power switch tube, the second power switch
The conducting and shutdown of pipe to realize DC bus ripple compensation function, while capableing of the voltage value of stable high voltage lateral capacitance.
By the compensation to high voltage dc bus ripple current, making the voltage and current DC quantity of DC bus, ripple content is very small,
System loss is reduced, the service life of capacitor is extended, guarantees that rear class DC/DC converter output voltage current precision is enough
It is high.
Detailed description of the invention
Fig. 1 is the electric topology structure chart principle schematic diagram of the utility model；
Fig. 2 is the control principle block diagram of the utility model.
Specific embodiment
As shown in Figure 1 and Figure 2, the utility model includes AC/DC, multiple groups DC/DC and the load of corresponding multiple groups, the multiple groups
The output end of DC/DC is separately connected the corresponding multiple groups load, uses high straightening after the input terminal of the multiple groups DC/DC is in parallel
Stream connects the DC output end that bus meets the AC/DC, and the ac input end of the AC/DC is connect with AC power source, it further includes
First capacitor C1, the second capacitor C2, inductance L, the first power switch tube S 1, the second power switch tube S 2, the first current sensor
Ia, the second current sensor Ib, control circuit, the both ends of the first capacitor C1 are separately connected first power switch tube S 1
Collector and second power switch tube S 2 emitter, the emitter of first power switch tube S 1 and described second
The collector of power switch tube S 2 is connected and connects one end of the inductance L, the other end connection described second of the inductance L
The anode of the AC/DC high voltage dc bus, the second capacitor C2 are connected behind one end of capacitor C2 using high voltage dc bus
Other end connection power switch tube S 2 emitter after the AC/DC is connected using high voltage dc bus direct current output it is negative
End, the first current sensor Ia acquire the second capacitor C2 and are connected with the anode of the AC/DC high voltage dc bus
DC bus on output electric current, the second current sensor Ib acquires the DC output end of the AC/DC and described more
The output electric current of group DC/DC, the current signal that the first current sensor Ia and the second current sensor Ib are acquired
It is connected to the control circuit.
The control circuit includes iir filter, PWM wave generator, PI controller, repetitive controller, multiple comparators,
Corresponding adaptation couples and connects between the iir filter, PWM wave generator, PI controller, repetitive controller, multiple comparators
The first current sensor Ia, the second current sensor Ib, the first current sensor Ia, second electric current pass
The DC bus current value that sampling obtains is input to the iir filter by sensor Ib, and direct current is calculated by iir filter
The average value of bus current, current value, which subtracts this average value, can be obtained DC bus current ripple component, by this ripple component
Compensation current error value of the resulting value as the present apparatus is negated, sends repetitive controller for the compensation current error value
In, compensation current is calculated by repetitive controller, compensation current is introduced into the corresponding comparator and is added deduct
Corresponding given value is calculated, the corresponding given value participates in controlling first power switch tube S 1, second in control circuit
The duty ratio of power switch tube S 2, first power switch tube S 1, the second power switch tube S 2 are complementary conduction mode work,
The duty ratio is sent in the PWM wave generator, and the PWM wave generator controls first power switch tube S 1, the
The conducting and shutdown of two power switch tube Ss 2, to realize DC bus ripple compensation function, while being capable of stable high voltage side
The voltage value of capacitor C1.
In the present embodiment, the DC bus ripple compensation device includes capacitor C1, capacitor C2, inductance L, power switch
Pipe S1, power switch tube S 2, current sensor Ia, current sensor Ib.The both ends of capacitor C1 are separately connected power switch tube S 1
The pole C and power switch tube S 2 the pole E.The pole E of one end connection power switch tube S 1 of inductance L and the pole C of power switch tube S 2,
The anode of the connection of the inductance L other end capacitor C2 and high voltage dc bus.One end connection inductance L and high voltage dc bus of capacitor C2
Anode, the other end connect power switch tube S 2 the pole E and high voltage dc bus cathode.Current sensor Ia acquires this direct current
The output electric current of bus ripple compensation device.The ripple current of current sensor Ib acquisition high voltage dc bus.Current sensor
The DC bus current value Ib that sampling obtains is input to infinite impulse response number by the current value Ib of real-time sampling DC bus
In low-pass filter, direct current mother is calculated by iir filter in infinite impulse response digital filter abbreviation iir filter
The average value of line current, subtracting this average value with Ib current value can be obtained DC bus current ripple component, by this ripple point
Compensation current error value of the anti-resulting value as the present apparatus is measured, Ic is denoted as.Repetition is sent by compensation current error value Ic
In controller, compensation current is calculated by repetitive controller, is denoted as Id.Repetitive controller is one based on inner membrance principle
Kind control thought, is suitably applied periodic signal, and repetitive controller and iir digital filter have mature in the prior art
Implementation is directly applied in the present invention.
In the present embodiment, the present apparatus needs high pressure lateral capacitance C1 to provide stable voltage for the present apparatus, can use PI control
Device processed carries out closed-loop control to it, method particularly includes: real-time sampling present apparatus high pressure lateral capacitance C1 voltage value, C1 voltage is real-time
The difference that value subtracts C1 voltage setting value is sent into PI controller, electricity needed for stable C1 voltage is calculated by PI controller
Flow valuve is denoted as Ie.
By compensation current Id with stablize C1 voltage needed for current value Ie be added, obtained sum as low-pressure side electric current to
Definite value.Ia current sensor real-time sampling low-pressure side current value, subtracts Ia electric current real value with low-pressure side given value of current value, obtains
Difference be input in PI controller, by PI controller be calculated control power switch tube S 1 duty ratio, power switch
Pipe S2 is complementary conduction mode with S1, i.e., when S1 is connected, S2 shutdown；When S1 shutdown, S2 conducting.And interleaving in S1 and S2
Enter dead time.Gained duty ratio is sent in PWM wave generator, PWM wave generator controls power switch tube S 1 and S2
Conducting and shutdown, to realize DC bus ripple compensation function, while capableing of the voltage value of stable high voltage lateral capacitance C1.This
Embodiment is the working principle based on two-way DC/DC conversion module, and inside modules contain storage capacitor.Device working principle is such as
Under: the present apparatus acquires the current signal of DC bus, the average value of calculating current, when DC bus current instantaneous value is higher than in real time
When average value, the present apparatus is from electric current storage is absorbed into internal storage capacitor in DC bus, when DC bus current instantaneous value
When subaverage, into DC bus, i.e. the present apparatus can export and line release current the present apparatus from internal storage capacitor
Wave current value amplitude is equal, and the electric current of opposite in phase compensates ripple current in a manner of peak load shifting, keeps DC bus ripple electric
Stream reduces, and achievees the effect that DC bus ripple current compensation.While compensating direct current bus ripple electric current, the present apparatus is controlled
Internal storage capacitor keeps certain voltage value.The utility model particularly suitable for converting twice containing AC/DC and DC/DC
The DC bus ripple compensation of current transformer.
The utility model can be widely applied to DC ripple compensation device technical field, for field where the utility model
Technical staff for, can be carried out with technical solution according to the present utility model and its design it is corresponding equivalent change or replacement,
And all these changes or replacement, it all should belong to the protection scope of the appended claims for the utility model.
Claims (2)
1. a kind of DC bus ripple compensation device, it includes AC/DC, multiple groups DC/DC and the load of corresponding multiple groups, the multiple groups
The output end of DC/DC is separately connected the corresponding multiple groups load, uses high straightening after the input terminal of the multiple groups DC/DC is in parallel
Stream bus connects the DC output end of the AC/DC, and the ac input end of the AC/DC is connect with AC power source, and feature exists
In: it further includes first capacitor (C1), the second capacitor (C2), inductance (L), the first power switch tube (S1), the second power switch
Manage (S2), the first current sensor (Ia), the second current sensor (Ib), control circuit, the both ends of the first capacitor (C1)
It is separately connected the collector of first power switch tube (S1) and the emitter of second power switch tube (S2), described
The emitter of one power switch tube (S1) is connected with the collector of second power switch tube (S2) and connects the inductance
(L) one end, the other end of the inductance (L) are connected after connecting one end of second capacitor (C2) using high voltage dc bus
The anode of the AC/DC high voltage dc bus, the transmitting of other end connection power switch tube (S2) of second capacitor (C2)
The direct current output negative terminal of the AC/DC is extremely connected using high voltage dc bus afterwards, first current sensor (Ia) acquires institute
The output electric current on the DC bus that the second capacitor (C2) is connected with the anode of the AC/DC high voltage dc bus is stated, it is described
The DC output end of second current sensor (Ib) the acquisition AC/DC and the output electric current of the multiple groups DC/DC, described first
The current signal that current sensor (Ia) and second current sensor (Ib) acquire is connected to the control circuit.
2. DC bus ripple compensation device according to claim 1, it is characterised in that: the control circuit includes IIR
Filter, PWM wave generator, PI controller, repetitive controller, multiple comparators, the iir filter, the PWM wave occur
Corresponding adaptation couples and connects first electric current between device, the PI controller, the repetitive controller, multiple comparators
Sensor (Ia) and second current sensor (Ib), first current sensor (Ia), second current sensor
(Ib) the DC bus current value that sampling obtains is input to the iir filter, direct current mother is calculated by iir filter
The average value of line current, current value, which subtracts this average value, can be obtained DC bus current ripple component, this ripple component is taken
Compensation current error value of the anti-resulting value as the DC bus ripple compensation device, the compensation current error value is sent out
It is sent in repetitive controller, compensation current is calculated by repetitive controller, compensation current is introduced into the corresponding ratio
Add deduct compared with device and corresponding given value is calculated, the corresponding given value participates in controlling first power in control circuit
The duty ratio of switching tube (S1), the second power switch tube (S2), first power switch tube (S1), the second power switch tube
It (S2) is complementary conduction mode work, the duty ratio is sent in the PWM wave generator, the PWM wave generator control
The conducting and shutdown of first power switch tube (S1), the second power switch tube (S2), to realize DC bus ripple
Compensation function, while capableing of the voltage value of stable high voltage lateral capacitance (C1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821204324.7U CN208707520U (en) | 2018-07-27 | 2018-07-27 | DC bus ripple compensation device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821204324.7U CN208707520U (en) | 2018-07-27 | 2018-07-27 | DC bus ripple compensation device |
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| CN208707520U true CN208707520U (en) | 2019-04-05 |
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| CN201821204324.7U Active CN208707520U (en) | 2018-07-27 | 2018-07-27 | DC bus ripple compensation device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111371297A (en) * | 2020-03-11 | 2020-07-03 | 杭州电子科技大学 | Current ripple compensation circuit and method adopting wide bandgap device and silicon-based device |
| CN111725979A (en) * | 2020-07-21 | 2020-09-29 | 南通大学 | Secondary harmonic current suppression method of two-stage single-phase inverter based on repetitive control |
| CN112054669A (en) * | 2020-08-21 | 2020-12-08 | 苏州浪潮智能科技有限公司 | VR output voltage loop control system |
| CN112600224A (en) * | 2020-12-08 | 2021-04-02 | 华北电力大学 | LC filtering device and method for offshore flexible direct current transmission system |
| CN112924744A (en) * | 2019-12-06 | 2021-06-08 | 新疆金风科技股份有限公司 | Ripple current measuring method and device, computer equipment and coil assembly |
| CN113541489A (en) * | 2021-07-02 | 2021-10-22 | 燕山大学 | Composite type staggered parallel direct current conversion circuit and control method |
| CN114301296A (en) * | 2020-11-23 | 2022-04-08 | 华为数字能源技术有限公司 | DC/DC converter and ripple voltage compensation method |
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2018
- 2018-07-27 CN CN201821204324.7U patent/CN208707520U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924744A (en) * | 2019-12-06 | 2021-06-08 | 新疆金风科技股份有限公司 | Ripple current measuring method and device, computer equipment and coil assembly |
| CN111371297A (en) * | 2020-03-11 | 2020-07-03 | 杭州电子科技大学 | Current ripple compensation circuit and method adopting wide bandgap device and silicon-based device |
| CN111371297B (en) * | 2020-03-11 | 2022-02-15 | 杭州电子科技大学 | Current ripple compensation circuit and method adopting wide bandgap device and silicon-based device |
| CN111725979A (en) * | 2020-07-21 | 2020-09-29 | 南通大学 | Secondary harmonic current suppression method of two-stage single-phase inverter based on repetitive control |
| CN112054669A (en) * | 2020-08-21 | 2020-12-08 | 苏州浪潮智能科技有限公司 | VR output voltage loop control system |
| CN114301296A (en) * | 2020-11-23 | 2022-04-08 | 华为数字能源技术有限公司 | DC/DC converter and ripple voltage compensation method |
| CN112600224A (en) * | 2020-12-08 | 2021-04-02 | 华北电力大学 | LC filtering device and method for offshore flexible direct current transmission system |
| CN112600224B (en) * | 2020-12-08 | 2022-09-30 | 华北电力大学 | LC filtering device and method for offshore flexible direct current transmission system |
| CN113541489A (en) * | 2021-07-02 | 2021-10-22 | 燕山大学 | Composite type staggered parallel direct current conversion circuit and control method |
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