CN204464995U - A kind of harmonic compensation circuit - Google Patents
A kind of harmonic compensation circuit Download PDFInfo
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- CN204464995U CN204464995U CN201520016756.5U CN201520016756U CN204464995U CN 204464995 U CN204464995 U CN 204464995U CN 201520016756 U CN201520016756 U CN 201520016756U CN 204464995 U CN204464995 U CN 204464995U
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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
- Y02E40/30—Reactive power compensation
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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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model discloses a kind of harmonic compensation circuit, comprise instruction current computing circuit and offset current circuit for generating, and described offset current circuit for generating comprises current follow-up control circuit, drive circuit and main circuit, and described main circuit is all connected described AC power with described instruction current computing circuit, and the two ends of a described main circuit electric capacity in parallel, and the other end of described main circuit connects described current follow-up control circuit by described drive circuit, and the other end of described current follow-up control circuit connects described instruction current computing circuit.The utility model achieves dynamic compensation, the harmonic wave that all can change frequency and size and the reactive power of change compensate, and the large I of compensating power accomplishes continuous adjustment, the change of target compensation is had to the response be exceedingly fast, can compensate the uneven active current of load, and the large I compensating uneven active current accomplishes continuous adjustment simultaneously.
Description
Technical field
The utility model designs a kind of harmonic compensation device, particularly relates to a kind of novel intelligent harmonic compensation device.
Background technology
In order to ensure the power supply quality of electrical network, preventing harmonic pollution and harm, necessary measure should be taked to solve harmonic pollution problems in electric power system.At present, these measures can be divided into two kinds: one is the mode of taking the initiative, and namely transform power electronic equipment itself, and the harmonic wave making it produce seldom or not produces harmonic wave, and control power factor is 1.But this measure is only applicable to the power electronic equipment as major harmonic source, there is certain limitation; And need to upgrade on a large scale power electronic equipment, cost is larger.
Another kind is exactly adopt passive mode, has both installed harmonic compensation device and has carried out compensation harmonic.This measure is applicable to various harmonic source and low power factor equipment, and method is simple, is widely used.The conventional method of harmonic compensation adopts LC tuned filter, usually adopts and carry out filtering by the passive filter (Passive Power Filter, PPF) that power capacitor, reactor and resistor are appropriately combined.
Along with the development of power electronic technology, filtering research direction is progressively turned to Active Power Filter-APF (Active Power Filter, APF) by people.APF is also a kind of power electronic equipment, its basic thought is exactly, from target compensation, detect harmonic current, utilize controlled power semiconductor to electrical network inject one with this harmonic current equal and opposite in direction and opposite polarity offset current, thus make power network current only containing fundametal compoment.
According to the difference using product, harmonic treating apparatus is mainly divided into passive filtering apparatus and active filter device two kinds.In China, passive filter is now widely used harmonics restraint means, has both adopted LC tuned filter.This method gets final product compensation harmonic, again can compensating reactive power, and structure is simple, is widely used always.The major defect of this method is that compensation characteristic affects by electric network impedance and running status, and easy and system generation parallel resonance, causes Harmonics amplification, LC filter is transshipped and even burns.In addition, it can only compensate the harmonic wave of fixed frequency, and compensation effect is also not satisfactory.However, LC filter is still the main means of current compensation harmonic.
At present, an important trend of harmonics restraint adopts Active Power Filter-APF (APF).The harmonic wave that this filter all can change frequency and amplitude carries out tracing compensation, and compensation characteristic is not by the impact of electric network impedance, thus paid attention to widely, and obtains extensive use in states such as Japan.
Utility model content
The purpose of this utility model is to provide a kind of harmonic compensation circuit, and it can solve above-mentioned shortcoming of the prior art.
The utility model is by the following technical solutions:
A kind of harmonic compensation circuit, comprise instruction current computing circuit and offset current circuit for generating, and described offset current circuit for generating comprises current follow-up control circuit, drive circuit and main circuit, and described main circuit is all connected described AC power with described instruction current computing circuit, and the two ends of a described main circuit electric capacity in parallel, and the other end of described main circuit connects described current follow-up control circuit by described drive circuit, and the other end of described current follow-up control circuit connects described instruction current computing circuit.
Described main circuit comprises each brachium pontis of three-phase four switching tubes, and two booster diodes.Wherein two switching tubes of each brachium pontis highest and lowest are equivalent to upper and lower switching tube in two level circuits, and two switching tubes of brachium pontis centre and two booster diodes form neutral-point-clamped circuit.
Described current follow-up control circuit is for comprising a main control chip, and the model of described main control chip is TMS320C28346.
The utility model has the advantages that:
L, achieve dynamic compensation, the harmonic wave that all can change frequency and size and the reactive power of change compensate, and the large I of compensating power accomplishes continuous adjustment, the change of target compensation is had to the response be exceedingly fast.
2, can compensate the uneven active current of load, and the large I compensating uneven active current accomplishes continuous adjustment simultaneously.
3, do not need energy-storage travelling wave tube during compensating power, during compensation harmonic, required energy-storage travelling wave tube capacity is also little.
Even if 4 target compensation electric currents are excessive, Active Power Filter-APF also can not transship, and normally can play compensating action.
5, the impact by electric network impedance is little, is not easy and electric network impedance generation resonance.
6, the change of energy Tracking Frequency of Power Grids, therefore compensation performance is by the impact of electrical network frequency change.
7, to a harmonic wave and reactive source separate compensation, also centralized compensation can be carried out to multiple harmonic wave and reactive source.
Accompanying drawing explanation
Below in conjunction with embodiment and accompanying drawing, the utility model is described in detail, wherein:
Fig. 1 is principle schematic of the present utility model.
Fig. 2 is circuit diagram of the present utility model.
Fig. 3 is the structural representation of governor circuit of the present utility model.
Fig. 4 is the structural representation of the current follow-up control circuit in the utility model.
Embodiment
Embodiment of the present utility model is set forth further below in conjunction with accompanying drawing:
As shown in Figures 1 to 4, a kind of harmonic compensation circuit, comprise instruction current computing circuit and offset current circuit for generating, and described offset current circuit for generating comprises current follow-up control circuit, drive circuit and main circuit, and described main circuit is all connected described AC power with described instruction current computing circuit, and the two ends of a described main circuit electric capacity in parallel, and the other end of described main circuit connects described current follow-up control circuit by described drive circuit, and the other end of described current follow-up control circuit connects described instruction current computing circuit.
Described main circuit comprises each brachium pontis of three-phase four switching tubes, and two booster diodes.Wherein two switching tubes of each brachium pontis highest and lowest are equivalent to upper and lower switching tube in two level circuits, and two switching tubes of brachium pontis centre and two booster diodes form neutral-point-clamped circuit.Described current follow-up control circuit is for comprising a main control chip, and the model of described main control chip is TMS320C28346.
Active Power Filter-APF (APF) is a kind of novel electric power electric device for dynamic harmonic wave, compensating reactive power, the harmonic wave that it all can change size and frequency and the idle of change compensate, and its application can overcome the shortcoming of traditional harmonics restraint such as LC filter and reactive-load compensation method.
As shown in Figure 1, es is expressed as AC power, and load is harmonic source, and it produces harmonic wave and consumes idle.Active Power Filter-APF is made up of two large divisions, both instruction current computing circuit and offset current circuit for generating (being made up of current follow-up control circuit, drive circuit and main circuit three parts).Wherein, the core of instruction current computing circuit detects harmonic wave in target compensation electric current and the current component such as idle, is therefore sometimes also referred to as wave superposition circuit.The effect of current follow-up control circuit is the command signal of the offset current drawn according to instruction current computing circuit, produces actual offset current.The basic functional principle of Active Power Filter-APF is, detect the voltage and current of target compensation, the command signal of offset current is calculated through instruction current computing circuit, this signal amplifies through offset current circuit for generating, draw offset current, what will compensate in offset current and load current humorously involves the electric current such as idle and offsets, and finally obtains the source current expected.
Active Power Filter-APF (APF) system configuration schematic diagram is as shown below, and in figure, Ua, Ub, Uc are ac grid voltage, and load is three-phase nonlinear load, can produce harmonic current.APF system is made up of two large divisions, i.e. harmonic current detection circuit and offset current circuit for generating.The three-level pwm current transformer that main circuit adopts IGBT to form, when producing offset current, mainly as inverter work.
The basic functional principle of APF is exactly by the electric current in the load of sample detecting electric circuit inspection, through the harmonic current calculated in load of DSP, then controlling power circuit by pwm signal produces identical with load harmonic current phase place, the offset current that size is contrary, harmonic current in offset current and load is cancelled out each other, and finally reaches the object of bucking-out system harmonic wave.
The core power circuit of Active Power Filter-APF (APF) is the PWM converter of three level, shown in main circuit See Figure.As seen from the figure, each brachium pontis of three-phase has 4 switching tubes (IGBT), and two booster diodes.Wherein two switching tubes of each brachium pontis highest and lowest are equivalent to upper and lower switching tube in two level circuits, and two switching tubes of brachium pontis centre and two booster diodes form neutral-point-clamped circuit.In figure, usa, usb, usc represent the three-phase voltage of AC network, and N represents zero line, and ica, icb, icc are three level APF output current, and load is three-phase nonlinear load.Current transformer DC voltage is udc, is formed by two groups of capacitances in series, and N point is capacitor voltage equalizing mid point, is connected with the booster diode of each brachium pontis.When the voltage on two electric capacity is equal, main switch bears udc/2.The structure of the every phase brachium pontis of current transformer is described with A phase, and as can be seen from the figure, A phase brachium pontis has four IGBT T1, T2, T3, T4, four fly-wheel diodes, two clamp diode D1, D2.
The hardware designs of APF mainly comprises main circuit design and design on control circuit, and main power circuit provides in one joint, and control circuit is the important component part of APF.Figure below gives the structured flowchart of APF control system hardware circuit, and it forms primarily of following components: DSP control circuit, electric current and voltage AD testing circuit, PWM output circuit, protective circuit, IGBT temperature detection etc.
The whole control circuit of DSP control circuit with 32 of TI company floating-point microprocessor TMS320C28346 for main control chip, TMS320C28346 is under the jurisdiction of Delfino MCU series of products member, running frequency can, up to 300MHZ, be for requiring that the strict height controlling to apply is integrated, high performance solution.Control system is aided with the EPM570T100CPLD chip of altera corp, and CPLD mainly carries out the logical process of some digital signals, and dsp chip completes the major functions such as sampled signal process, controlling calculation, protection and pwm signal output.
AD input and conditioning unit: AD input comprises three-phase power grid voltage input altogether, threephase load current signal detects, three-phase SVG output electric current measure, two-way DC capacitor voltage detects, detect through instrument transformer, after discharge circuit conditioning, by outside AD sampling A/D chip AD7656 sample conversion, output digit signals is to DSP process.IGBT temperature detects and is completed by an independent A/D chip AD7995, exports DSP to by I2C communication interface.
Protective circuit: the effect of protective circuit is protection APF failure-free operation, and when APF DC capacitor voltage is too high, or electric capacity voltage difference is excessive up and down; line voltage is abnormal, when power device temperature is too high, and the raw guard signal of the protective circuit sell of one's property; cut off PWM output signal, close APF.
PWM drives: DSP, after calculation process, produces pwm signal, by outside amplifying circuit amplifying signal, then has the PWM drive singal of driving force to drive the IGBT of main power circuit through isolated drive circuit formation.
Communication: SCI, SPI communication interface of DSP control system is all reserved, later convenient and control centre's communication.
Whole system software mainly comprises following subroutine module: DSP initialization module, AD signal processing module, data processing (calculating of instruction reactive current) module, SPWM pulse output module, digital PI closed loop device module, protection module and communication module etc.
L, achieve dynamic compensation, the harmonic wave that all can change frequency and size and the reactive power of change compensate, and the large I of compensating power accomplishes continuous adjustment, the change of target compensation is had to the response be exceedingly fast.
2, can compensate the uneven active current of load, and the large I compensating uneven active current accomplishes continuous adjustment simultaneously.
3, do not need energy-storage travelling wave tube during compensating power, during compensation harmonic, required energy-storage travelling wave tube capacity is also little.
Even if 4 target compensation electric currents are excessive, Active Power Filter-APF also can not transship, and normally can play compensating action.
5, the impact by electric network impedance is little, is not easy and electric network impedance generation resonance.
6, the change of energy Tracking Frequency of Power Grids, therefore compensation performance is by the impact of electrical network frequency change.
7, to a harmonic wave and reactive source separate compensation, also centralized compensation can be carried out to multiple harmonic wave and reactive source.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (3)
1. a harmonic compensation circuit, it is characterized in that, comprise instruction current computing circuit and offset current circuit for generating, and described offset current circuit for generating comprises current follow-up control circuit, drive circuit and main circuit, and described main circuit is all connected an AC power with described instruction current computing circuit, and the two ends of a described main circuit electric capacity in parallel, and the other end of described main circuit connects described current follow-up control circuit by described drive circuit, and the other end of described current follow-up control circuit connects described instruction current computing circuit.
2. harmonic compensation circuit according to claim 1, it is characterized in that, described main circuit comprises each brachium pontis of three-phase four switching tubes, with two booster diodes, wherein two switching tubes of each brachium pontis highest and lowest are equivalent to upper and lower switching tube in two level circuits, and two switching tubes of brachium pontis centre and two booster diodes form neutral-point-clamped circuit.
3. harmonic compensation circuit according to claim 2, is characterized in that, described current follow-up control circuit is for comprising a main control chip, and the model of described main control chip is TMS320C28346.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520016756.5U CN204464995U (en) | 2015-01-09 | 2015-01-09 | A kind of harmonic compensation circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520016756.5U CN204464995U (en) | 2015-01-09 | 2015-01-09 | A kind of harmonic compensation circuit |
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| CN204464995U true CN204464995U (en) | 2015-07-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130021A (en) * | 2016-06-23 | 2016-11-16 | 全球能源互联网研究院 | A kind of flexible tuner of T-shaped mixing |
| CN106786589A (en) * | 2017-03-07 | 2017-05-31 | 合肥赛沃能源科技有限公司 | A kind of bridge arm shunt active power filter of tri- level of 690V three |
-
2015
- 2015-01-09 CN CN201520016756.5U patent/CN204464995U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130021A (en) * | 2016-06-23 | 2016-11-16 | 全球能源互联网研究院 | A kind of flexible tuner of T-shaped mixing |
| CN106130021B (en) * | 2016-06-23 | 2024-03-19 | 全球能源互联网研究院 | T-shaped hybrid flexible tuning device |
| CN106786589A (en) * | 2017-03-07 | 2017-05-31 | 合肥赛沃能源科技有限公司 | A kind of bridge arm shunt active power filter of tri- level of 690V three |
| CN106786589B (en) * | 2017-03-07 | 2019-08-16 | 安徽赛沃电气科技股份有限公司 | A kind of tri- level of 690V, three bridge arm shunt active power filter |
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