CN201975789U - Harmonic current canceling module and module group - Google Patents
Harmonic current canceling module and module group Download PDFInfo
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- CN201975789U CN201975789U CN2011200154393U CN201120015439U CN201975789U CN 201975789 U CN201975789 U CN 201975789U CN 2011200154393 U CN2011200154393 U CN 2011200154393U CN 201120015439 U CN201120015439 U CN 201120015439U CN 201975789 U CN201975789 U CN 201975789U
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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 harmonic current canceling module which comprises a direct-current voltage-stabilizing and current tracking control unit, a driving unit, a three-phase full-bridge converting circuit, a direct-current voltage-stabilizing capacitor group, a three-phase single harmonic filter circuit, a current sensor and a voltage sensor. The utility model also discloses a harmonic current canceling module group comprising many harmonic current canceling modules, and after being connected in parallel, the harmonic current canceling modules are connected with a low-voltage distribution bus coupler by a circuit breaker. With the adoption of a module structure, the harmonic current canceling module group has convenience for standard production and capacity expansion and N+1 redundancy and can improve the running reliability of a system; and as the single power harmonic waves are canceled, the filter circuit has reasonable design, and the canceling effect on harmonic current is good.
Description
Technical field
The utility model relates to a kind of electric power low-voltage distribution system, particularly is applied to the harmonic current cancellation module of this system.
Background technology
Along with semiconductor device uses in electric power system in a large number, the harmonic wave harm that nonlinear load causes begins to draw attention, and the harmonic problem in the electric power low-voltage distribution system also more and more is subjected to people and pays close attention to.Suppress and elimination for harmonic wave, main means have at devices such as distribution system side adding passive electric filtering, active power filterings; Or add power factor correction link etc. in the electricity consumption side.The passive electric filtering device mainly is the combination that is connected of adopting reactor and capacitor, and makes the passive electric filtering device present reasonable impedance to harmonic voltage or harmonic current by the serial or parallel connection resonance manner, thereby reaches the purpose of harmonic wave inhibition or elimination.Active Power Filter-APF mainly adopts power electronics semiconductor device, eliminates pointedly by the harmonic current or the harmonic voltage that calculate system, generally is each harmonic integral body is suppressed or eliminates.Power factor correction also is to adopt power electronics semiconductor device, by control current waveform and voltage waveform is consistent substantially, thereby reaches the purpose that improves power factor, inhibition and harmonic carcellation.
Above-mentioned several method all uses, and passive electric filtering is influenced by relatively more fixing grade of self frequency characteristic owing to the combination that is connected of adopting reactor with capacitor, and the scope of application is more limited; Active electric filter device is owing to suppress and eliminates each harmonic, require in real time also very high, design with produce relative difficultly, cost is higher; Power factor correction is power conversion circuit because all power all can be flowed through, and generally only is applicable to the middle low power occasion.
The utility model content
The utility model purpose: at the problem and shortage of above-mentioned existing existence, the purpose of this utility model provides a kind of harmonic current cancellation module and the harmonic wave current canceling module group that can offset single harmonic current pointedly in the electric power low-voltage distribution system.
Technical scheme: for realizing above-mentioned utility model purpose, the technical solution adopted in the utility model is: a kind of harmonic current cancellation module comprises DC voltage-stabilizing and current tracking control unit, driver element, three phase full bridge translation circuit, DC voltage-stabilizing capacitor group, three-phase single harmonic component filter circuit, current sensor and voltage sensor; The input input single harmonic current phase signal of described DC voltage-stabilizing and current tracking control unit, DC voltage-stabilizing is connected the input of driver element with the output of current tracking control unit, the input of three phase full bridge translation circuit connects the output of driver element, the dc capacitor side of three phase full bridge translation circuit connects DC voltage-stabilizing capacitor group, the AC side of three phase full bridge translation circuit connects the input of three-phase single harmonic component filter circuit, current sensor is sampled to the output current of three-phase single harmonic component filter circuit and is fed back to DC voltage-stabilizing and current tracking control unit, and voltage sensor carries out the direct voltage sampling and feeds back to DC voltage-stabilizing and current tracking control unit the dc capacitor side of three phase full bridge translation circuit.
Described three-phase single harmonic component filter circuit can comprise three-phase reactor.
Described three phase full bridge translation circuit can comprise insulated gate bipolar transistor or field effect transistor in parallel again after 6 series connection in twos.
Described DC voltage-stabilizing capacitor group can comprise the DC electrolytic condenser of two series connection and the resistance of two series connection, and wherein the DC electrolytic condenser of two series connection resistance whole and two series connection are whole in parallel.
Ring harmonic current ring and outer shroud direct voltage regulation loop in described DC voltage-stabilizing and current tracking control unit can comprise.
Described harmonic current cancellation module also can comprise the lead-in circuit breaker of the output that connects described three-phase single harmonic component filter circuit.
Described harmonic current cancellation module also can comprise protected location and demonstration and monitoring unit; the feedback signal input protection unit of described current sensor and voltage sensor; protected location connects driver element and demonstration and monitoring unit, shows and monitoring unit connection DC voltage-stabilizing and current tracking control unit.
Described demonstration and monitoring unit can comprise demonstration and man-machine interface, single-chip microcomputer and the dual port RAM (random access memory) that connects successively.
Described demonstration and monitoring unit can communicate by RS485 interface and host computer.
The invention also discloses a kind of harmonic current cancellation module group of being made up of described harmonic current cancellation module, described harmonic current cancellation module connects the female connection of low-voltage distribution through circuit breaker after parallel connection.
Beneficial effect: only need to detect the phase place of single harmonic current, directly single electric harmonic electric current is offset, and do not need the detection and the calculating of all loaded down with trivial details harmonic waves; Each module can be offset the system harmonics of corresponding number of times pointedly according to own capacity and harmonic number output harmonic wave electric current; Two closed-loop controls of ring harmonic current ring, outer shroud DC voltage-stabilizing ring guaranteed control precision and performance that separate unit moves in each module adopted; Adopt modular construction, the N+1 redundancy can improve the stability and the reliability of overall operation.
Description of drawings
Fig. 1 is overall structure figure of the present utility model;
Fig. 2 is a modular applications winding diagram of the present utility model;
Fig. 3 is a main circuit circuit diagram of the present utility model;
Fig. 4 is DC voltage-stabilizing of the present utility model and current tracking control unit block diagram;
Fig. 5 is demonstration of the present utility model and monitoring unit block diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the utility model, should understand these embodiment only be used to the utility model is described and be not used in the restriction scope of the present utility model, after having read the utility model, those skilled in the art all fall within the application's claims institute restricted portion to the modification of the various equivalent form of values of the present utility model.
As shown in Figure 1, the utility model harmonic current cancellation module is by lead-in circuit breaker, connect to form at three-phase single harmonic component filter circuit, three phase full bridge translation circuit, the DC voltage-stabilizing capacitor group of offsetting number of times, and has corresponding circuit control system.The circuit control system of this module is made up of DC voltage-stabilizing and current tracking control unit, protected location, driver element and demonstration and monitoring unit.
The harmonic current cancellation module detects the single harmonic current phase signal from incoming line cabinet CT (current transformer), adopt interior ring harmonic current ring, outer shroud DC voltage-stabilizing ring behind driver element, the three phase full bridge translation circuit to be carried out two closed-loop controls according to this phase signal, three phase full bridge translation circuit DC side is a DC voltage-stabilizing capacitor group, AC side is by generation and the opposite harmonic current of system's single harmonic current phase place behind the three-phase single harmonic component filter circuit, thereby realization is to the counteracting of the electric harmonic electric current of system.
The harmonic current cancellation module has comprehensive defencive function, and the function of protected location comprises: output overcurrent protection, direct current overvoltage and under-voltage protection, input overvoltage and under-voltage protection, overtemperature protection etc.With the output overcurrent protection is example: the numerical value that the output current signal that sampling obtains obtains behind filter rectification and the overcurrent protection value of setting compare, when the numerical value that obtains behind the output current filter rectification during greater than the overcurrent protection value set, protection starts action, and driver element is not worked; Otherwise then protection does not start.Other protection philosophies are similar, the function difference.
As shown in Figure 2, because there are a large amount of nonlinear loads in low pressure electricity consumption side, adopt N+1 platform harmonic current cancellation module that harmonic wave is suppressed and eliminates, module is installed in the electric power low-voltage distribution system, every module energy independent operating or combined running as required.The harmonic current cancellation module is connected on the female connection of low-voltage distribution through circuit breaker, the number of times and the capacity of offsetting harmonic wave according to need carry out the modular parallel connection, every module with the current signal of incoming line cabinet CT as input, with definite phase signal that needs the single harmonic current of counteracting, by exporting corresponding times harmonic electric current, offset the function of electric current to finish single harmonic component.
As shown in Figure 3, the main circuit of each module is formed by connecting by three-phase single harmonic component filter circuit, three phase full bridge translation circuit and DC voltage-stabilizing capacitor group.Generally can constitute at the three-phase single harmonic component filter circuit of offsetting number of times by three-phase reactor (or combination of reactor and capacitor); The three phase full bridge translation circuit is made up of 6 power electronics semiconductor device, can select insulated gate bipolar transistor (IGBT) or field effect transistor (MOSFET) for use; DC voltage-stabilizing capacitor group constituting by DC electrolytic condenser and discharge resistance.
As shown in Figure 4, two closed-loop controls of ring harmonic current ring, outer shroud direct voltage regulation loop in the DC voltage-stabilizing of module and current tracking control unit adopt.Obtain harmonic current reference signal i behind the single harmonic current phase signal process phase-locked loop that need offset and the sinusoidal signal product
Hr, i
HrWith Δ i
pAnd negative i
hError after the summation is regulated the back by hysteresis current control through ratio, and the three phase full bridge translation circuit is carried out power drive.Carry out the direct voltage sampling from the dc capacitor side then, compare with the direct voltage reference signal through after the Voltage Feedback, the error signal passing ratio integration that relatively obtains is regulated the back as error compensating signal Δ i
pAdd electric current loop.The AC side of three phase full bridge translation circuit is sampled to output current after the filtering link and is fed back, as current feedback signal i
hWith current reference signal i
HrAnd error compensating signal Δ i
pCompare.The DC voltage-stabilizing of module and current tracking control unit mainly can be finished by digital signal processor.
As shown in Figure 5, demonstration and monitoring unit are made up of demonstration and man-machine interface, single-chip microcomputer and dual port RAM.Single-chip microcomputer will from DC voltage-stabilizing and current tracking control unit, transmit on the one hand main voltage and current signal read and show; On the other hand the input instruction in the man-machine interface and parameter are transferred to the DSP (digital signal processor) of DC voltage-stabilizing and current tracking control unit by dual port RAM.Demonstration and monitoring unit also can communicate by RS485, and main information is sent to host computer and carries out networking.
Claims (10)
1. a harmonic current cancellation module is characterized in that: comprise DC voltage-stabilizing and current tracking control unit, driver element, three phase full bridge translation circuit, DC voltage-stabilizing capacitor group, three-phase single harmonic component filter circuit, current sensor and voltage sensor; The input input single harmonic current phase signal of described DC voltage-stabilizing and current tracking control unit, DC voltage-stabilizing is connected the input of driver element with the output of current tracking control unit, the input of three phase full bridge translation circuit connects the output of driver element, the dc capacitor side of three phase full bridge translation circuit connects DC voltage-stabilizing capacitor group, the AC side of three phase full bridge translation circuit connects the input of three-phase single harmonic component filter circuit, current sensor is sampled to the output current of three-phase single harmonic component filter circuit and is fed back to DC voltage-stabilizing and current tracking control unit, and voltage sensor carries out the direct voltage sampling and feeds back to DC voltage-stabilizing and current tracking control unit the dc capacitor side of three phase full bridge translation circuit.
2. according to the described harmonic current cancellation module of claim 1, it is characterized in that: described three-phase single harmonic component filter circuit comprises three-phase reactor.
3. according to the described harmonic current cancellation module of claim 1, it is characterized in that: described three phase full bridge translation circuit comprises insulated gate bipolar transistor or field effect transistor in parallel again after 6 series connection in twos.
4. according to the described harmonic current cancellation module of claim 1, it is characterized in that: described DC voltage-stabilizing capacitor group comprises the DC electrolytic condenser of two series connection and the resistance of two series connection, and wherein the DC electrolytic condenser of two series connection resistance whole and two series connection are whole in parallel.
5. according to the described harmonic current cancellation module of claim 1, it is characterized in that: ring harmonic current ring and outer shroud direct voltage regulation loop in described DC voltage-stabilizing and current tracking control unit comprise.
6. according to the described harmonic current cancellation module of claim 1, it is characterized in that: the lead-in circuit breaker that also comprises the output that connects described three-phase single harmonic component filter circuit.
7. according to the described harmonic current cancellation module of claim 1; it is characterized in that: also comprise protected location and demonstration and monitoring unit; the feedback signal input protection unit of described current sensor and voltage sensor; protected location connects driver element and demonstration and monitoring unit, shows and monitoring unit connection DC voltage-stabilizing and current tracking control unit.
8. according to the described harmonic current cancellation module of claim 7, it is characterized in that: described demonstration and monitoring unit comprise demonstration and man-machine interface, single-chip microcomputer and the dual port RAM that connects successively.
9. according to claim 7 or 8 described harmonic current cancellation modules, it is characterized in that: described demonstration and monitoring unit communicate by RS485 interface and host computer.
10. harmonic current cancellation module group of being made up of harmonic current cancellation module according to claim 1, it is characterized in that: described harmonic current cancellation module connects the female connection of low-voltage distribution through circuit breaker after parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200154393U CN201975789U (en) | 2011-01-18 | 2011-01-18 | Harmonic current canceling module and module group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200154393U CN201975789U (en) | 2011-01-18 | 2011-01-18 | Harmonic current canceling module and module group |
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| Publication Number | Publication Date |
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| CN201975789U true CN201975789U (en) | 2011-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200154393U Expired - Lifetime CN201975789U (en) | 2011-01-18 | 2011-01-18 | Harmonic current canceling module and module group |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130457A (en) * | 2011-01-18 | 2011-07-20 | 江苏斯菲尔电气股份有限公司 | Harmonic current counteracting module |
| CN109212311A (en) * | 2018-09-26 | 2019-01-15 | 电子科技大学 | A kind of real-time fractional harmonic wave detection method of novel comb filtering |
| CN112909944A (en) * | 2021-01-22 | 2021-06-04 | 广东志成冠军集团有限公司 | Hybrid electric energy treatment device and method |
-
2011
- 2011-01-18 CN CN2011200154393U patent/CN201975789U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130457A (en) * | 2011-01-18 | 2011-07-20 | 江苏斯菲尔电气股份有限公司 | Harmonic current counteracting module |
| CN109212311A (en) * | 2018-09-26 | 2019-01-15 | 电子科技大学 | A kind of real-time fractional harmonic wave detection method of novel comb filtering |
| CN109212311B (en) * | 2018-09-26 | 2020-12-01 | 电子科技大学 | Novel real-time subharmonic detection method for comb filtering |
| CN112909944A (en) * | 2021-01-22 | 2021-06-04 | 广东志成冠军集团有限公司 | Hybrid electric energy treatment device and method |
| CN112909944B (en) * | 2021-01-22 | 2021-12-07 | 广东志成冠军集团有限公司 | Hybrid electric energy treatment device and method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110914 |
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| CX01 | Expiry of patent term |