CN203103956U - Active power filter for power grid - Google Patents
Active power filter for power grid Download PDFInfo
- Publication number
- CN203103956U CN203103956U CN2013200907310U CN201320090731U CN203103956U CN 203103956 U CN203103956 U CN 203103956U CN 2013200907310 U CN2013200907310 U CN 2013200907310U CN 201320090731 U CN201320090731 U CN 201320090731U CN 203103956 U CN203103956 U CN 203103956U
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- resistance
- active power
- fault
- signal
- power filter
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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 relates to an active power filter for a power grid. The active power filter is positioned between the power grid and a load, comprises a harmonic current detection circuit, a drive circuit, a main circuit and a transformer, and is provided with a detection electric signal used for marking fault information, a fault detection circuit comprising an operational amplifier as isolation and a high-frequency filter unit comprising a resistor R4 and a capacitor, a comparison circuit comprising a comparator, a voltage division resistor unit and an adjustable resistor, a programmable logic module used for comparing a monitoring signal output by the comparator in the comparison circuit with a standard value and filtering an interference signal to judge if a system has a fault, a latch-up module connected to the programmable logic module and used for driving an execution mechanism to stop the system, and a processor module connected to the programmable logic module, wherein the operational amplifier is connected in series with the high-frequency filter unit. The active power filter can be used for not only achieving fault monitoring, but also filtering false fault signals, and further improving the reliability and stability of the system.
Description
Technical field
The utility model relates to a kind of electrical network Active Power Filter-APF, belongs to electric power control field.
Background technology
The generally use of power electronic equipment and nonlinear load makes harmonic current and reactive current inject electrical network in a large number, and the safe operation of serious threat electrical network and electric equipment is used with normal, carries out filtering and compensate more and more being paid attention to by people to harmonic wave is idle.Active Power Filter-APF is preferably one of the selection that improves the quality of power supply, therefore develops very fast.Active Power Filter-APF is the power electronic equipment of a kind of dynamic inhibition harmonic wave and compensating reactive power, it can be to frequency and big or small harmonic wave and idle the compensating that all changes, can remedy the shortcoming of passive filter, acquisition is a kind of desirable compensation harmonic device than the better compensation characteristic of passive filter.
But Active Power Filter-APF often breaks down and tends to break down, and has potential safety hazard, even set up the equipment of monitor for faults, also can break down, thereby cause a large amount of spurious glitches to produce, and has wasted resource and human cost greatly.
Summary of the invention
The purpose of this utility model provides a kind of electrical network Active Power Filter-APF, and this Active Power Filter-APF had both been realized the monitoring to the Active Power Filter-APF fault, again can filtering spurious glitches signal, further improved the reliability and stability of system.
For achieving the above object, the technical solution adopted in the utility model is: a kind of electrical network Active Power Filter-APF, this Active Power Filter-APF are between electrical network and load, and it comprises harmonic current detection circuit, drive circuit, main circuit and transformer; Described Active Power Filter-APF has the detection signal of telecommunication that is used to identify fault message; Also comprise:
Failure detector circuit, the HFS that is used for the described detection signal of telecommunication of filtering obtains to detect the signal of telecommunication after the filtering, comprises the operational amplifier of the conduct isolation that is connected in series and the High frequency filter unit of being made up of R4 resistance and electric capacity;
Comparison circuit, comprise comparator, divider resistance unit and adjustable resistance, input of comparator connects described adjustable resistance, detects the signal of telecommunication after being used to receive the filtering from failure detector circuit, another input of comparator connects described divider resistance unit, is used to receive reference value;
Be set with the programmed logical module of fault-signal pulse duration standard value, be used for pilot signal and standard value from the output of comparison circuit comparator are compared, filtering interference signals, thus judge whether system exists fault;
Lock modules is connected to described programmed logical module, quits work thereby be used to drive the system that makes of actuator;
Processor module is connected to described programmed logical module, according to the time that the signal from programmed logical module continues, and failure judgement width and type, thus correspondingly drive described lock modules.
Further improved plan is as follows in the technique scheme:
1, in the such scheme, described divider resistance unit comprises R1 resistance, R2 resistance and R3 resistance, and R1 resistance and R2 resistance string are coupled between 5 volts of power supplys and the ground connection, and the cross-over connection of described R3 resistance is between the contact and ground connection of adjustable resistance and comparator.
2, in the such scheme, a reset switch that is used to reset is connected to described programmed logical module, is used for the switching of high and low level.
Because the technique scheme utilization, the utility model compared with prior art has following advantage and effect:
The utility model electrical network Active Power Filter-APF, it had both realized the monitoring to the Active Power Filter-APF fault, again can filtering spurious glitches signal, further improved the reliability and stability of system, also improved efficient, avoided the waste of a large amount of manpowers.
Description of drawings
Accompanying drawing 1 is the utility model electrical network Active Power Filter-APF electrical schematic diagram;
Accompanying drawing 2 is a failure detector circuit structural representation in the utility model Active Power Filter-APF;
Accompanying drawing 3 is a comparison circuit structural representation in the utility model Active Power Filter-APF;
Accompanying drawing 4 is a reset switch structural representation in the utility model Active Power Filter-APF;
Accompanying drawing 5 is judged schematic diagram for the utility model signal.
In the above accompanying drawing: 1, failure detector circuit; 2, operational amplifier; 3, electric capacity; 4, comparison circuit; 5, comparator; 6, divider resistance unit; 7, adjustable resistance; 8, programmed logical module; 9, reset switch; 91, light-emitting diode; 10, lock modules; 11, processor module; 12,5 volts of power supplys.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described:
Embodiment: a kind of electrical network Active Power Filter-APF, this Active Power Filter-APF are between electrical network and load, and it comprises harmonic current detection circuit, drive circuit, main circuit and transformer; Described Active Power Filter-APF has the detection signal of telecommunication that is used to identify fault message, also comprises;
Failure detector circuit 1, the HFS that is used for the described detection signal of telecommunication of filtering obtains to detect the signal of telecommunication after the filtering, comprises the operational amplifier 2 of the conduct isolation that is connected in series and the High frequency filter unit of being made up of R4 resistance and electric capacity 3;
Comparison circuit 4, comprise comparator 5, divider resistance unit 6 and adjustable resistance 7,5 one inputs of comparator connect described adjustable resistance 7, detect the signal of telecommunication after being used to receive filtering from failure detector circuit 1, comparator 5 another inputs connect described divider resistance unit 6, are used to receive reference value;
Be set with the programmed logical module 8 of fault-signal pulse duration standard value, be used for pilot signal and standard value from 5 outputs of comparison circuit 4 comparators are compared, filtering interference signals, thus judge whether system exists fault;
Lock modules 10 is connected to described programmed logical module 8, quits work thereby be used to drive the system that makes of actuator;
Processor module 11 is connected to described programmed logical module 8, according to the time that the signal from programmed logical module 8 continues, and failure judgement width and type, thus correspondingly drive described and lock modules 10.
Above-mentioned divider resistance unit 6 comprises R1 resistance, R2 resistance and R3 resistance, and R1 resistance and R2 resistance string are coupled between 5 volts of power supplys 12 and the ground connection, and the cross-over connection of described R3 resistance is between the contact and ground connection of adjustable resistance 7 and comparator 5.
One reset switch that is used to reset 13 is connected to described programmed logical module 8, is used for the switching of high and low level.
Above-mentioned electrical network is further described below with Active Power Filter-APF.
Fault-signal compares with comparison circuit 4 through failure detector circuit 1, produces square-wave waveform and enters programmed logical module 8(CPLD), in CPLD, judge the true and false of signal.
The explanation that accompanying drawing 1 is more complete this Active Power Filter-APF constitute block diagram, the fault that at first gets the wrong sow by the ear if there is fault to drive lock modules 10 operations, shows concrete fault, notification processor module 11 is determined next step operation scheme.It can be manually that fault resets, and also can automatically reset.
General interference signal different shape has, and is the example explanation for convenience of description with the pulse signal, and pulse duration is very narrow, and energy is low.If real direct current overvoltage; to export low level reliably through comparison circuit; and top signal has the false fault-signal generation of of short duration low level through becoming one behind the comparison circuit, like this at DC circuit error protection characteristics, in programmed logical module 8 this signal shielding is fallen.Other type signal also can similar like this processing.
Block diagram illustrating: at first judge whether to exist fault, if exist fault to count (width that is used for failure judgement).If counting illustrates then that greater than set point (every class fault is different, and it is fixed separately specifically to need) fault is true fault, carry out associative operation, otherwise this signal of ignoring.
When adopting above-mentioned electrical network to use Active Power Filter-APF, it had both realized the monitoring to the Active Power Filter-APF fault, again can filtering spurious glitches signal, further improved the reliability and stability of system, and also improved efficient, avoided the waste of a large amount of manpowers.
The foregoing description only is explanation technical conceive of the present utility model and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present utility model and enforcement according to this, can not limit protection range of the present utility model with this.All equivalences of being done according to the utility model spirit change or modify, and all should be encompassed within the protection range of the present utility model.
Claims (3)
1. electrical network Active Power Filter-APF, this Active Power Filter-APF is between electrical network and load, and it comprises harmonic current detection circuit, drive circuit, main circuit and transformer; Described Active Power Filter-APF has the detection signal of telecommunication that is used to identify fault message, it is characterized in that: also comprise:
Failure detector circuit (1), the HFS that is used for the described detection signal of telecommunication of filtering obtains to detect the signal of telecommunication after the filtering, comprises the operational amplifier (2) of the conduct isolation that is connected in series and the High frequency filter unit of being made up of R4 resistance and electric capacity (3);
Comparison circuit (4), comprise comparator (5), divider resistance unit (6) and adjustable resistance (7), (5) inputs of comparator connect described adjustable resistance (7), detect the signal of telecommunication after being used for receiving filtering from failure detector circuit (1), another input of comparator (5) connects described divider resistance unit (6), is used to receive reference value;
Be set with the programmed logical module (8) of fault-signal pulse duration standard value, be used for pilot signal and standard value from comparison circuit (4) comparator (5) output are compared, filtering interference signals, thus judge whether system exists fault;
Lock modules (10) is connected to described programmed logical module (8), quits work thereby be used to drive the system that makes of actuator;
Processor module (11) is connected to described programmed logical module (8), according to the time that the signal from programmed logical module (8) continues, and failure judgement width and type, thus correspondingly drive described lock modules (10).
2. Active Power Filter-APF according to claim 1, it is characterized in that: described divider resistance unit (6) comprises R1 resistance, R2 resistance and R3 resistance, R1 resistance and R2 resistance string are coupled between 5 volts of power supplys (12) and the ground connection, and the cross-over connection of described R3 resistance is between the contact and ground connection of adjustable resistance (7) and comparator (5).
3. Active Power Filter-APF according to claim 1 is characterized in that: a reset switch that is used to reset (9) is connected to described programmed logical module (8), is used for the switching of high and low level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200907310U CN203103956U (en) | 2013-02-28 | 2013-02-28 | Active power filter for power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200907310U CN203103956U (en) | 2013-02-28 | 2013-02-28 | Active power filter for power grid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203103956U true CN203103956U (en) | 2013-07-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013200907310U Expired - Lifetime CN203103956U (en) | 2013-02-28 | 2013-02-28 | Active power filter for power grid |
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| Country | Link |
|---|---|
| CN (1) | CN203103956U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510518A (en) * | 2017-09-15 | 2019-03-22 | 伊利诺斯工具制品有限公司 | The braking system of electromagnetic machine |
-
2013
- 2013-02-28 CN CN2013200907310U patent/CN203103956U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510518A (en) * | 2017-09-15 | 2019-03-22 | 伊利诺斯工具制品有限公司 | The braking system of electromagnetic machine |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130731 |