CN208754063U - A kind of harmonic energy recycling circuit - Google Patents
A kind of harmonic energy recycling circuit Download PDFInfo
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- CN208754063U CN208754063U CN201821721924.0U CN201821721924U CN208754063U CN 208754063 U CN208754063 U CN 208754063U CN 201821721924 U CN201821721924 U CN 201821721924U CN 208754063 U CN208754063 U CN 208754063U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model discloses a kind of harmonic energy recycling circuit, the secondary winding connection output processing unit of transformer T, first winding one end of the transformer T connects zero curve, one of Same Name of Ends of the transformer T connects firewire with inductance L through capacitor C1 through capacitor C1 connection firewire, another Same Name of Ends.The utility model is by converting the extraction of the harmonic electric energy of alternating current filter equipment and filter secondary side electrical equipment in power system transmission line, it is converted into AC or DC low-tension supply, it is used for the particular devices such as illuminating, wirelessly communicating, or through the conversion of DC-AC in feeding back to system, it is seen that can get the beneficial effect turned harm into good, made a silk purse out of a sow's ear.In addition, needing many inverters, this will form a large amount of harmonic wave to power grid, it is seen that system designed by this project has broad application prospects in new energy with the expansion of new energy scale.
Description
Technical field
The utility model relates to harmonic treatment technology fields.
Background technique
For electric energy as the energy most popular in modern society, level of application is to measure a national development level
One of the important signs that.In recent years, as the fast development of China's electric utility, the scale of electric system are growing, electric energy is tight
Scarce problem gradually solves, but at the same time, constantly cumulative since the more and more device therefors of user side generate harmonic wave,
Leading to the basic reason that user is also higher and higher to the cry for improving power quality, and harmonic wave generates is by nonlinear load institute
It causes.Non-sinusoidal current is formed not in a linear relationship with added voltage when electric current flows through nonlinear load, i.e., has in circuit
Harmonic wave generates.With the development of electronic technology, nonlinear load is in the trend gradually increased in power grid, and nonlinear load is working
When to power grid feed back harmonic wave, lead to voltage, the current waveform distortion of power supply system.In the case where voltage distortion, with power grid phase
Other loads also can therefore generate harmonic current.
Influence of the harmonic wave to transmission line of electricity is very big, and the presence of harmonic wave endangers the normal firm operation of electric system, mainly
Show the following aspects:
(1) it is possible to cause the network parallel resonance overvoltage of a certain higher hamonic wave, the insulation of power grid electrical equipment is made
It is influenced at certain, or even causes the insulation breakdown of weak part；
(2) it affects to control, protection and the detection device in system, it is former especially with phase or frequency
The some protective devices and control device that science and engineering is made influence even more serious, it is possible to the phenomenon that protection misoperation occur；
(3) so that the power equipment in utility network is generated additional loss, reduce the effect of power generation, transmission of electricity and electrical equipment
Rate；
(4) efficiency of the electric energy in production, transmission and consumption process is reduced, causes device of overheating of electrical to run, seriously
Possibly even initiation fire, and be accompanied by strong vibration and noise；
(5) so that some electrical equipments (such as electrostatic condenser) with capacitive generated heat, explode and is caught fire, make that there is capacitive
Electric material (such as cable) overheat and premature deterioration；
(6) make dielectric accelerated ageing, insulation life shortens, and causes electric power system fault when serious；
(7) presence of a large amount of harmonic waves is also to communication equipment (neighbouring communication apparatus, the especially communication parallel with transmission line of electricity
Route), other equipment such as electronic equipment and protective relaying device generate serious interference；
(8) prevent the thyristor for accessing operation of power networks from turning off in time, may cause thyristor short circuit and burn；
(9) harmonic wave can cause power grid resonance, several times of amplified harmonic current or even decades of times can may be constituted weight to system
Big to threaten, especially to capacitor and reactor connected in series, power grid resonance can often be allowed to burn.
(10) the steady promotion of power electronic technique itself is also hindered by existing for harmonic wave.
It is directed to above-mentioned harmonic problem, associate power authorities should carry out network analysis to administrative power distribution network, correctly
Measurement effectively administers the basic material made adequate preparation to determine harmonic wave source position and Producing reason for harmonic wave.Traditional is humorous
Wave administering method mainly has passive power filter and Active Power Filter-APF.Passive power filter be by filter condenser,
Reactor and resistor is appropriately combined forms, principle is the resonance of capacitor and inductance, and shaping filter filters harmonic wave, removes
To outside the effect of filtering, and can be with compensating power, and structure is simple, and it is easily designed, it is cheap, so in power train
It is widely used always in system.The major defect of this method is that compensation characteristic is influenced by electric network impedance and operating status, Yi He
Parallel resonance occurs for system.Lead to Harmonics amplification, burns LC filter overload even.In addition, it can only compensate fixed frequency
Harmonic wave, compensation effect is bad.Active Power Filter-APF is a kind of power electronics dress for dynamic harmonic wave, compensating reactive power
It sets, may be implemented to compensate the harmonic current containing multiple harmonic, and do not influenced by harmonic wave and power grid variation, is i.e. dynamic
Compensation, real-time tracking.The basic principle is that harmonic current is detected from target compensation, it is humorous with this by compensation device generation one
Wave size of current is equal and compensation electric current that polarity is just the opposite, so that the electric current for injecting power grid be made to contain only fundametal compoment.It
The harmonic wave and the idle of variation that can all change to size and frequency compensate, and it is traditional that application overcomes LC filter etc.
Disadvantage in harmonics restraint and reactive-load compensation method.Active power filter is connected in parallel in load, passes through detection compensation pair
The command signal of compensation electric current is calculated in the voltage and current of elephant.The compensated current occuring circuit amplification of the signal, obtains benefit
Electric current, the harmonic wave to be compensated in compensation electric current and load current and idle equal current cancelings are repaid, expected power supply electricity is finally obtained
Stream, still, active filter cost is 3 times of passive filter or more, and technology is now relatively mature, but maintenance cost
Height is not available by hardware limitation in large capacity occasion, and active power filtering capacity list set is no more than 100KVA, and highest is applicable at present
Network voltage is no more than 690V.In the actual process, the power loss of active filter high-power switch device is very surprising, real
Border working efficiency is no more than 98%, is far below traditional LC passive filtering equipment, it can be seen that, harmonic wave itself is also one kind by power frequency
The energy that fundamental wave converts, although filtering out the shadow for solving harmonic wave to power grid by passive or Active Power Filter-APF
It rings, but also considerable part harmonic energy is converted into thermal energy and is wasted.
Summary of the invention
Technical problem to be solved in the utility model is to realize that a kind of highly efficient regeneration utilizes the technology of harmonic electric energy, will be humorous
The system that wave is turned waste into wealth.
To achieve the goals above, the technical solution adopted by the present invention are as follows: a kind of harmonic energy recycling circuit, transformation
The secondary winding connection output processing unit of device T, first winding one end of the transformer T connect zero curve, the transformer T's
One of Same Name of Ends connects firewire with inductance L through capacitor C1 through capacitor C1 connection firewire, another Same Name of Ends.
Two winding numbers of ampere turns of the first winding of the transformer T are identical.
The inductance L is nonlinear device.
The capacitor C1 is identical with capacitor C2 capacitive reactance.
The output processing unit includes sequentially connected rectification circuit and translation circuit, and the rectification circuit uses bridge-type
Rectification circuit, the translation circuit use Boost-Buck chopper circuit.
The output processing unit includes sequentially connected rectification circuit and inverter circuit, and the rectification circuit uses bridge-type
Rectification circuit, the inverter circuit use full bridge inverter.
The utility model by by power system transmission line alternating current filter equipment and the electricity consumption of filter secondary side
The extraction of the harmonic electric energy of equipment is converted, and AC or DC low-tension supply is converted into, for specific set such as illuminating, wirelessly communicating
It is standby to use, or through the conversion of DC-AC in feeding back to system, it is seen that it can get the beneficial effect turned harm into good, made a silk purse out of a sow's ear
Fruit.In addition, needing many inverters, this will form a large amount of harmonic wave to power grid with the expansion of new energy scale, it is seen that
System designed by this project has broad application prospects in new energy.
Detailed description of the invention
The content of width attached drawing every in the utility model specification expression is briefly described below:
Fig. 1 is that harmonic energy recycles circuit diagram；
Fig. 2 is the principle framework figure of DC voltage converting circuit；
Fig. 3 is bridge rectifier schematic diagram；
Fig. 4 is Boost-Buck chopper circuit schematic diagram
Fig. 5 is DC transfer circuit schematic diagram；
Fig. 6 is ac power circuit schematic diagram；
Fig. 7 is AC transform circuit schematic diagram.
Specific embodiment
The utility model proposes a kind of harmonic wave energy extraction element of parallel connection type, which passes through in system power line road
The extraction of harmonic component, is carried out rectification and inversion obtains corresponding DC voltage and alternating voltage for different loads.By
This is as it can be seen that the system can not only filter out the harmonic wave of specific times, moreover it is possible to the harmonic wave electricity that consume script on damping resistance
Energy extraction and application, while the device is equivalent to capacitor for 50Hz fundamental wave, also provides while filtering harmonic wave for system
It is idle, open a kind of new technology of regeneration harmonic electric energy.Furthermore the system avoids fundamental wave during application
Damping resistance active loss, that is, it is big uneconomical to solve the problems, such as to filter out harmonic voltage source loss, tight in energy-saving and emission-reduction situation
The research of high today, this project undoubtedly have fabulous social benefit and economic value.
As shown in Figure 1, the system voltage of AC network passes through reactive-load compensation capacitor C2/C1, L and transformer T respectively
First winding flow back to system, the series loop that C2 and C1, L are formed equivalent capacitance under fundamental voltage is identical, transformer T
First winding Same Name of Ends respectively at two capacitive branch be connected, two winding numbers of ampere turns are identical, except that in C1 branch
Resonant inductor L, L and C1 are also in series in specific times harmonic frequency series resonance, in this way, flowing through transformer T first winding
Electric current be divided into two groups, one group is the reactive current (C1 branch) containing harmonic wave, another group of reactive current for being free from harmonic wave
(C2 branch), since the fundamental reactive current of two capacitors is identical, two first winding numbers of ampere turns are also identical therefore produced
The identical counteracting of fundamental flux, and for harmonic component, since resonance occurs for the C1 under harmonic wave state and L, impedance zero is flowed through
Harmonic current flow through the electric current of C2 much larger than harmonic wave, harmonic flux can not be offset at this time, be sensed the secondary of transformer T
Side is rectified into the DC voltage of smooth steady by the secondary high-power factory rectifier flanked, uses, completes humorous for load
The extraction of wave electric energy is converted.
For the harmonic wave containing different frequency ingredient in system, this system is using the resonant tank of different resonance frequencies to it
It extracts.The harmonic energy of different numbers corresponds to different L and C1, since this harmonic energy extraction element is needed at specific time
Series resonance occurs for L and C1 under number harmonic waves, makes harmonic energy by being not consumed when extraction element, when harmonic energy is from transmission of electricity
After route extracts, harmonic energy is gone out from major transmission line pass by coupling transformer, by converting means again by
It utilizes, and fundamental wave energy will not be extracted, this is because left and right fundamental current is identical in extraction element, be become through overcoupling
Equal in magnitude contrary when depressor, fundamental current can cancel each other out, so will not be extracted by transformer.
Inductance L in circuit is nonlinear device, and inductance is saturated after the harmonic current flowed through is greater than the set value, reactance value
Reduction makes to filter frequency departure resonance frequency, so that harmonic current is reduced automatically, avoiding device overload damage, i.e. solution harmonic voltage
Cause filter overload problem in source.This circuit structure has also been avoided as much as fundamental wave reactive power while extracting harmonic electric energy
The loss of component, complete machine all non-consume energy to obtain inductance and capacity cell composition, does not use a resistive element, it is clear that its is active
Loss can be reduced to very small range.
Harmonic energy recovery system is in parallel on route in the process of running, this will generate the original operating status of system
It influences, in order to understand influence of the hanging net operation to network system of the system, its equivalent circuit is constructed, and to power grid
Influence carried out simulation analysis.Connect alternate in 380V power grid, every phase structure is identical, and the no-load voltage ratio of transformer is 3000/3000, filter
Except 3 subharmonic, the leakage reactance of each winding is identical, and C1/C2 capacitive reactance is essentially identical (to take capacitance C=11.26uF, inductance L=
100mH), it is seen that device is under 50Hz operational mode, due to the electric current by capacitor C1 and C2 input harmonics energy extraction device
Equal, it is equal, contrary to be formed by magnetic field amplitude, does not generate voltage, electric current, i.e. fundamental wave energy theoretically in secondary side
It says and does not form any loss.Therefore, for power grid, which is equivalent under 50Hz power frequency has accessed about in the line
23.9uf capacitor is equivalent to the reactive-load compensation capacitor of a 363Var.It can be seen that harmonic energy extraction system is in 50Hz
It is equivalent to reactive-load compensator under power frequency, reactive compensation is carried out to power grid, improves the power quality of route.
In conclusion harmonic extractor designed by the utility model utilizes the inductance component L and capacitor member in branch
Series resonance occurs for part C1, and the harmonic current for making both ends enter transformer is uneven, induces harmonic wave in the secondary side of transformer
Electric current realizes the extraction to harmonic energy, and under 50Hz power frequency, the inductance component L in branch does not occur with capacity cell C1
Resonance keeps the electric current into transformer both ends equal, and magnetic balance occurs in transformer primary side, does not feel in Circuit Fault on Secondary Transformer at this time
50Hz current signal should be gone out, to realize the inhibition to power frequency energy.In addition, the inductance L used in this project is non-linear
Device, inductance is saturated after the harmonic current flowed through is greater than the set value, and reactance value reduction makes to filter frequency departure resonance frequency, thus
Automatic to reduce harmonic current, avoiding device overload damage solves harmonic voltage source and causes filter overload problem.
Exporting processing unit can be DC power supply, or AC power source.
DC power supply design:
Power supply system of the DC power supply as loads such as electronic device, LED, is widely applied in practice.Entirely
The general requirement of power supply is: stability height (i.e. load regulation, input voltage regulation are small, and ripple factor is small), it is high-efficient,
It is small in size, at low cost, with perfect defencive function (overcurrent protection, overheating protection, output over-voltage protection, input undervoltage protection
Deng), stability is good, can long time continuous working.According to power circuit working principle, whole system is become by rectification circuit and voltage
Change circuit composition.According to power circuit working principle, whole system is made of rectification circuit and voltage conversion circuit, such as Fig. 2 institute
Show.
It is realized in the present system using bridge rectifier and harmonic voltage signal is converted into d. c. voltage signal, in order to make
Obtained voltage signal can be applied to engineering actual load, need to convert to the DC voltage that it is exported, in this project
Translation circuit realized using boost-buck circuit.
Bridge rectifier is made of four diodes, and concrete principle figure is as shown in figure 4, in u2Positive half cycle, D2, D4 cut
Only, D1, D3 are connected, output voltage u0Polarity on it is just lower negative, when ignoring the pressure drop on diode D1, D3, u0Waveform and u2Phase
Together；And in u2Negative half period, D1, D3 cut-off, D2, D4 conducting, output voltage u0Polarity be also on it is just lower negative, when ignoring two poles
When pressure drop on pipe D2, D4, u0Waveform also with u2It is identical.Bridge rectifier output voltage u0Waveform it is identical as full-wave rectification；
Furthermore transformer secondary output is in working condition, and utilization rate is high, i.e., the rectification circuit of identical output power, bridge rectifier institute
It needs Industrial Frequency Transformer volume minimum, therefore is widely applied (when being rectified to power-frequency voltage, can use in a power
Common rectifier diode；When to high-frequency signal rectification, the high fast recovery diode of available work frequency).
Boost-Buck chopper circuit is also referred to as step-down/up type translation circuit (such as Fig. 4), is that a kind of output voltage can both be lower than
The single tube not isolated DC translation circuit of input voltage can also be higher than, but the polarity of its output voltage is opposite with input voltage.
Boost-Buck converter can regard that Buck converter and Boost are connected in series as, incorporate switching tube.Buck is cut
Inductance l values are very big in wave circuit, and capacitor C value is also very big, make inductive current iLWith capacitance voltage u0Essentially constant.It is opened when controllably
When closing in the conductive state, power supply is powered through controllable switch to inductance L, it is made to store energy, and electric current is i at this time1.Meanwhile electricity
Hold C to maintain output voltage substantially constant and power to load R.Hereafter, turn off Switching Power Supply, the energy stored in inductance L to
Load release, electric current i2.As it can be seen that load voltage polarity be it is upper it is negative under just, it is opposite with electric power polarity.
As shown in figure 5, the working principle of entire power supply are as follows: system first with full-wave bridge rectifier circuit one-way conduction
The harmonic alternating current electricity that direction and size all change is transformed to that direction is constant but size still has the direct current of pulsation by rectifier cell.
Four diodes are used in circuit, are connected into bridge architecture mutually.It is acted on using the conduct current of diode, in AC-input voltage
Positive half cycle in, diode D1, D3 conducting, D2, D4 cut-off, charge to filter capacitor C；It is exactly the opposite in negative half period,
D1, D3 cut-off, D2, D4 conducting, the current direction for flowing through load is consistent with positive half cycle, also charges to filter capacitor C, thus
It realizes and AC harmonic voltages is converted into DC voltage.Then subsequent boost-buck circuit is utilized, by changing switch S's
Rectification circuit is converted into required voltage by the duty ratio of control signal.
Ac power circuit design:
When load needs 50Hz industrial frequency AC to power, then need to carry out AC-AC conversion to the harmonic alternating current voltage of input, at this
The conversion to exchange is realized using the mode of AC-DC-AC in project, circuit theory is as shown in Figure 6.
According to above-mentioned AC transform circuit functional block diagram, entire AC transform circuit is designed, principle is such as
Shown in Fig. 7.The working principle of entire circuit are as follows: system for input harmonic voltage U1, first with what is be made of D1~D4
Harmonic alternating current voltage is converted into DC voltage by bridge rectifier, and is filtered using filter capacitor C to it, and direct current is reduced
Then the ripple factor of voltage utilizes the full bridge inverter being made of switching device M1~M4 that DC voltage is converted into 50Hz
Ac square wave finally utilizes the resonance circuit being made of inductance L and capacitor C5 to filter it, thus transformer T it is secondary around
Group side obtains alternating voltage, and amplitude can realize the adjustment to output voltage by the no-load voltage ratio of transformer T.
The present invention is exemplarily described above in conjunction with attached drawing, it is clear that the utility model implements not by above-mentioned
The limitation of mode, as long as using the improvement of the method concept of the utility model and the various unsubstantialities of technical solution progress,
Or it is not improved the conception and technical scheme of the invention are directly applied to other occasions, in the protection model of the utility model
Within enclosing.
Claims (6)
1. a kind of harmonic energy recycles circuit, the secondary winding connection output processing unit of transformer T, it is characterised in that:
First winding one end of the transformer T connects zero curve, and one of Same Name of Ends of the transformer T is through capacitor C1 connection fire
Line, another Same Name of Ends connect firewire with inductance L through capacitor C1.
2. harmonic energy according to claim 1 recycles circuit, it is characterised in that: the transformer T it is primary around
Two winding numbers of ampere turns of group are identical.
3. harmonic energy according to claim 1 or 2 recycles circuit, it is characterised in that: the inductance L is non-linear
Device.
4. harmonic energy according to claim 3 recycles circuit, it is characterised in that: the capacitor C1 and capacitor C2 holds
Resist identical.
5. harmonic energy according to claim 1 or 4 recycles circuit, it is characterised in that: the output processing unit
Including sequentially connected rectification circuit and translation circuit, the rectification circuit uses bridge rectifier, and the translation circuit is adopted
With Boost-Buck chopper circuit.
6. harmonic energy according to claim 1 or 4 recycles circuit, it is characterised in that: the output processing unit
Including sequentially connected rectification circuit and inverter circuit, the rectification circuit uses bridge rectifier, and the inverter circuit is adopted
Use full bridge inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821721924.0U CN208754063U (en) | 2018-10-23 | 2018-10-23 | A kind of harmonic energy recycling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821721924.0U CN208754063U (en) | 2018-10-23 | 2018-10-23 | A kind of harmonic energy recycling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208754063U true CN208754063U (en) | 2019-04-16 |
Family
ID=66086047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821721924.0U Active CN208754063U (en) | 2018-10-23 | 2018-10-23 | A kind of harmonic energy recycling circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN208754063U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018770A (en) * | 2020-07-30 | 2020-12-01 | 中山大学 | Ultra-wideband rectification circuit based on harmonic feedback and design method |
| CN117728596A (en) * | 2024-02-08 | 2024-03-19 | 深圳市瀚强科技股份有限公司 | Harmonic energy recovery circuit and radio frequency power supply device |
-
2018
- 2018-10-23 CN CN201821721924.0U patent/CN208754063U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018770A (en) * | 2020-07-30 | 2020-12-01 | 中山大学 | Ultra-wideband rectification circuit based on harmonic feedback and design method |
| CN112018770B (en) * | 2020-07-30 | 2024-03-01 | 中山大学 | Ultra-wideband rectification circuit based on harmonic feedback and design method |
| CN117728596A (en) * | 2024-02-08 | 2024-03-19 | 深圳市瀚强科技股份有限公司 | Harmonic energy recovery circuit and radio frequency power supply device |
| CN117728596B (en) * | 2024-02-08 | 2024-05-10 | 深圳市瀚强科技股份有限公司 | Harmonic energy recovery circuit and radio frequency power supply device |
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