CN207053179U - A kind of series connection type active electric power filter - Google Patents
A kind of series connection type active electric power filter Download PDFInfo
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- CN207053179U CN207053179U CN201721057623.8U CN201721057623U CN207053179U CN 207053179 U CN207053179 U CN 207053179U CN 201721057623 U CN201721057623 U CN 201721057623U CN 207053179 U CN207053179 U CN 207053179U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
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Abstract
The utility model discloses a kind of series connection type active electric power filter, including current follower, equivalent resistance generator, transformer and rectifier circuit；The input of current follower is connected with AC power, and output end is connected with equivalent resistance generator；Equivalent resistance generator is connected with transformer and rectifier circuit.The utility model is connected between AC power and load, and dynamic equivalent resistance is obtained by circuit, realizes that control source current meets the sine wave with frequency with phase with supply voltage, so as to effectively suppress mains by harmonics.
Description
Technical field
The utility model belongs to a kind of a kind of device for suppressing mains by harmonics, specifically a kind of series connection type active electric power filtering
Device.
Background technology
As installed capacity in power grid continues to increase, the use of power electronic element is more and more in power network, causes substantial amounts of
Harmonic current injection power network, sinusoidal wave distortion is caused, the quality of power supply declines, and not only some visual plants of power system are produced
Significant impact, users are also generated with serious harm.Main harm is as follows：
1st, harmonic wave can make the power equipment in utility network produce additional loss, reduce generating, transmission of electricity and electricity consumption and set
Standby efficiency.A large amount of triple-frequency harmonics, which flow through center line, to overheat circuit, serious possibly even initiation fire.
2nd, harmonic wave can influence the normal work of electrical equipment, motor is produced the failure such as mechanical oscillation and noise, transformer
The apparatus overheats such as local serious overheat, capacitor, cable, insulated part aging, rotten, equipment life reduction, until final damage
It is bad.
3rd, harmonic wave can cause power network resonance, may form several times of amplified harmonic current or even decades of times great to system
Threaten, particularly to capacitor and reactor connected in series, power network resonance can often be allowed to burn.
4th, harmonic wave can cause relay protection and automatics to malfunction, and cause unnecessary power failure and loss.
5th, harmonic wave can make electrical measuring instrument metering inaccurate, error in dipping be produced, to power supply department or power consumer band
Carry out direct economic loss.
6th, harmonic wave can produce interference to the communication system near equipment, gently then produce noise, reduce communication quality；It is heavy then lead
Breath loss is write, makes communication system can not normal work.
7th, the normal work of the electronic equipment such as harmonic wave meeting interference calculation machine system, causes loss of data or deadlock.
8th, harmonic wave can influence the service behaviour of the equipment such as radio transmitting system, radar system, nuclear magnetic resonance, cause noise
Interference and image are disorderly.
Active Power Filter-APF traditional at present is parallel connection type, is only applicable to compensate the load of current mode harmonic source (such as perception
The rectification of load), there is certain limitation.
Utility model content
The purpose of this utility model is：There is provided one kind regarding to the issue above can compensate to voltage-type harmonic source,
Effectively suppress the series connection type active electric power filter of the voltage-type harmonic source pollution of injection power network.
To achieve these goals, the utility model uses following technical scheme：
A kind of series connection type active electric power filter, including current follower, equivalent resistance generator, transformer and rectifier bridge
Circuit；The input of current follower is connected with AC power, and output end is connected with equivalent resistance generator；Equivalent resistance occurs
Device is connected with transformer and rectifier circuit.Described Active Power Filter-APF is connected between AC power and load.It is described
Current follower include voltage amplifier, multiplicative operator, hystersis controller；The input and AC power of voltage amplifier
Connection, output end are connected with multiplicative operator；Multiplicative operator input is connected with voltage amplifier, output end and Hysteresis control
Device connects；Hystersis controller input is connected with multiplicative operator and divider output end；Described equivalent resistance generator bag
Include divider and command voltage computing circuit；The input of command voltage computing circuit is connected with transformer, output end and division
Device connects；The input of rectifier circuit is connected between AC power and load to be connected with transformer；Transformer series exchange
It is connected between power supply and load with the command voltage computing circuit in equivalent resistance generator.
Control targe of the present utility model is to control source current to meet the sine wave with frequency with phase with supply voltage.It is active
Electric-power filter can be controlled and active output current by sampling load current and carry out each harmonic and idle separation
Size, frequency and phase, and quick response, phase induced current in load is offset, realizes dynamic tracing compensation.Active electric power is filtered
Ripple device is connected between AC power and load, and the carrier load of Active Power Filter-APF harmony is regarded as an equivalent resistance together
Re, Us=Re*is is met by supply voltage by circuit.(i.e. supply voltage and source current is linear.) due to power supply
Voltage and source current are typically out of phase in the presence of nonlinear load, and therefore, crux is exactly that acquisition is dynamic equivalent
Resistance Re.The active-power P s of power supply output should be equal to the active-power P apf and non-thread that series connection type active electric power filter absorbs
The active-power P l sums of property load absorption, (i.e. Ps=Pl+Papf).
Operation principle of the present utility model is as follows：
(1) when system is in stable state, wattful power does not occur between series connection type active electric power filter and power supply and load
The exchange of rate, only provide harmonic wave and reactive power needed for load.Therefore in a power frequency period, series connection type active electric power filter
The DC bus capacitor energy storage of ripple device does not change, i.e. the average value of capacitance voltage Uc keeps constant, now load current (output
Electric current) linear relationship be present in Id average value and the virtual value Is of source current；
(2) when system load power increases (Pl>0) the energy increase of, (i.e. load resistance R reductions), then load absorption, this
When series connection type active electric power filter instantaneously to load provide energy, play a part of buffered sources.Series connection type active electric power is filtered
Ripple device sends active power, i.e. (Papf<0), electric capacity is in discharge condition, i.e. the average value of capacitance voltage Uc declines, now whole
Flow filtering back loading electric current (output current) Id increases of bridge output；
(3) when system load power reduces (Pl<0), (i.e. load resistance R increases), the then energy that load instantaneous absorbs
Reduce, series connection type active electric power filter absorbs active power, i.e. (Papf>0), electric capacity is in charged state, i.e. capacitance voltage
The increase of Uc average values, filtering back loading electric current (output current) Id of now rectifier bridge output decline.
Effect of the present utility model is：The utility model is connected between AC power and load, obtained by circuit
Dynamic equivalent resistance is taken, realizes that control source current meets the sine wave with frequency with phase with supply voltage, so as to effectively suppress
Mains by harmonics.
Brief description of the drawings
Fig. 1 is circuit block diagram of the present utility model.
Fig. 2 is fundamental diagram of the present utility model.
In figure：R：Load resistance
C:Electric capacity
Us：Supply voltage
Uc：Capacitance voltage
UL：Rectification bridge voltage
is：Source current
im：Transformer secondary side current
id：Filter back loading electric current (output current)
Kc Uc：Capacitance voltage sampled signal
Ksid：Load current sampled signal
Ksis：Source current sampled signal
Embodiment
The utility model is further described below in conjunction with accompanying drawing：
As shown in figure 1, the utility model is connected between AC power and load, including：Current follower, equivalent resistance
Generator, rectifier circuit and transformer.
Current follower includes voltage amplifier, multiplicative operator, hystersis controller.The input of voltage amplifier and friendship
Power supply connection is flowed, output end is connected with multiplicative operator.Multiplicative operator input is connected with voltage amplifier, output end with it is stagnant
Ring controller connects.Hystersis controller input is connected with multiplicative operator and divider output end.Hystersis controller will export
Voltage is maintained in the hysteresis band centered on internal reference voltage.
Equivalent resistance generator includes divider and command voltage computing circuit.The input of command voltage computing circuit with
Transformer is connected, and output end is connected with divider.Equivalent resistance generator is additionally provided with rectifier, filter capacitor, resistance, amplification
Device.Command voltage computing circuit includes three-phase bridge Voltage Source PWM Inverter, inductance and the filtered electrical that power MOSFET is formed
Hold, its target compensation is the three-phase diode-bridge rectification circuit with capacitor filtering, including is connected to protection circuit and I/O circuits
CPLD (CPLD), DSP single-chip microcomputers and D/A change-over circuits.CPLD data-interface and DSP single-chip microcomputers
Data-interface connects.The signal port of CPLD and DSP single-chip microcomputers is connected with D/A change-over circuits, D/A change-over circuits and current tracking
Control circuit connects.
The input of rectifier circuit is connected between AC power and load to be connected with transformer.Rectifier circuit be by
It can make the electric current in circuit only by one-way flow, i.e., so-called " rectification " during its incoming transport circuit.Rectifier circuit passes through two
The one-way conduction principle of pole pipe completes rectification, and alternating current is converted into direct current.
Transformer series between AC power and load with the command voltage computing circuit phase in equivalent resistance generator
Even, for gathering and adjusting load voltage.
Operation principle of the present utility model is as shown in Figure 2：
(1) when system is in stable state, wattful power does not occur between series connection type active electric power filter and power supply and load
The exchange of rate, only provide harmonic wave and reactive power needed for load.Therefore in a power frequency period, series connection type active electric power filter
The DC bus capacitor energy storage of ripple device does not change, i.e. the average value of capacitance voltage Uc keeps constant, now load current (output
Electric current) linear relationship be present in Id average value and source current Is virtual value；
(2) when system load power increases (Pl>0) the energy increase of, (i.e. load resistance R reductions), then load absorption, this
When series connection type active electric power filter instantaneously to load provide energy, play a part of buffered sources.Series connection type active electric power is filtered
Ripple device sends active power, i.e. (Papf<0), electric capacity C is in discharge condition, i.e. the average value of capacitance voltage Uc declines, by changing
Become the transformer pair for being connected on and being connected between AC power and load with the command voltage computing circuit in equivalent resistance generator
Side electric current Im, change the input voltage of rectifier bridge, so as to adjust output current, the filtering back loading electric current of now rectifier bridge output
(output current) Id increases；
(3) when system load power reduces (Pl<0), (i.e. load resistance R increases), the then energy that load instantaneous absorbs
Reduce, series connection type active electric power filter absorbs active power, i.e. (Papf>0), electric capacity is in charged state, i.e. capacitance voltage
Uc average value increase, transported by changing to be connected between AC power and load with the command voltage in equivalent resistance generator
The connected transformer secondary side current Im of circuit is calculated, changes the input voltage of rectifier bridge, so as to adjust output current, now rectifier bridge
Filtering back loading electric current (output current) Id of output declines.
From the above it can be seen that the change of bearing power, reflects the change of load resistance, capacitance voltage Uc is shown as on circuit
Mean variation and rectifier bridge output current Id change.Series connection type active electric power filter DC capacitor voltage Uc, it is whole
Bridge filtering back loading electric current (output current) Id is flowed, passes through capacitance voltage sampled signal Kc UcWith load current sampled signal
Ksid, equivalent resistance Re is reflected by divider, its output is equivalent resistance 1/Re, and output passes through multiplier and supply voltage
Signal KsUs is multiplied, and obtains the sinusoidal reference signal KsUs/Re of source current, finally, is realized by hystersis controller to sine
The tracking of reference current.The utility model is connected between AC power and load, dynamic equivalent resistance is obtained by circuit
Re, realize that control source current meets the sine wave with frequency with phase with supply voltage, so as to restrained effectively mains by harmonics.
Claims (1)
- A kind of 1. series connection type active electric power filter, it is characterised in that：Including current follower, equivalent resistance generator, transformation Device and rectifier circuit；The input of current follower is connected with AC power, and output end is connected with equivalent resistance generator；Deng Effect resistance generator is connected with transformer and rectifier circuit；Described Active Power Filter-APF is connected on AC power and load Between；Described current follower includes voltage amplifier, multiplicative operator, hystersis controller；The input of voltage amplifier It is connected with AC power, output end is connected with multiplicative operator；Multiplicative operator input is connected with voltage amplifier, output end It is connected with hystersis controller；Hystersis controller input is connected with multiplicative operator and divider output end；Described equivalent resistance Value generator includes divider and command voltage computing circuit；The input of command voltage computing circuit is connected with transformer, defeated Go out end to be connected with divider；The input of rectifier circuit is connected between AC power and load to be connected with transformer；Transformation Device is connected between AC power and load to be connected with the command voltage computing circuit in equivalent resistance generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721057623.8U CN207053179U (en) | 2017-08-23 | 2017-08-23 | A kind of series connection type active electric power filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721057623.8U CN207053179U (en) | 2017-08-23 | 2017-08-23 | A kind of series connection type active electric power filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207053179U true CN207053179U (en) | 2018-02-27 |
Family
ID=61502562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721057623.8U Active CN207053179U (en) | 2017-08-23 | 2017-08-23 | A kind of series connection type active electric power filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207053179U (en) |
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2017
- 2017-08-23 CN CN201721057623.8U patent/CN207053179U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190611 Address after: 610041 No. 1, 1st Floor, 206 Blocks, No. 1, Middle Section of Tianfu Avenue, Chengdu High-tech Zone, Sichuan Province Patentee after: Hong Zhitu source, Sichuan Science and Technology Ltd. Address before: Room 535, 5th floor, Building No. 171 Meisheng Road, Pudong New Area Free Trade Pilot Area, Shanghai, 2001 Patentee before: Shanghai Diane Amperex Technology Limited |
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| TR01 | Transfer of patent right |