CN2641886Y - Parallel harmonic comprehensive suppressor - Google Patents
Parallel harmonic comprehensive suppressor Download PDFInfo
- Publication number
- CN2641886Y CN2641886Y CN 03241470 CN03241470U CN2641886Y CN 2641886 Y CN2641886 Y CN 2641886Y CN 03241470 CN03241470 CN 03241470 CN 03241470 U CN03241470 U CN 03241470U CN 2641886 Y CN2641886 Y CN 2641886Y
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- circuit
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Abstract
The utility model discloses a parallel type comprehensive harmonic suppression device , which belongs to the technical field of power harmonic filters, and substantially solves the difficulty of parallel active filters in detecting fundamental wave subtracted harmonic currents from practically distorted currents and producing compensating currents equivalent to the harmonic currents. The utility model is essentially characterized in that the device comprises a harmonic suppression transformer, and a voltage sampling shaping circuit, a SPWM pulse generating circuit, a driving circuit and an inverting circuit in successive connection, wherein the primary side of the harmonic suppression transformer is paralleled between the power network and a load, and the secondary side connects with the output end of the inverting circuit; two voltage transformers of the voltage sampling shaping circuit are respectively connected to the power network side and between the secondary side of the harmonic suppression transformer and the output end of the inverting circuit. The utility model is essentially used for harmonic treatment of the power system.
Description
Technical field
The utility model belongs to electric harmonic wave filter technology field.
Background technology
Existing parallel connection type active electric filter mainly comprises mains by harmonics current detection circuit, the compensating current generating circuit identical with harmonic current, offset current is coupled in the electrical network, and its weak point one is that to detect the harmonic current of having deducted first-harmonic from the electric current of reality distortion be very difficult; The 2nd, the generation of the offset current identical with harmonic current is difficulty more.
Summary of the invention
The purpose of this utility model is exactly to provide a kind of to detect fundamental voltage at above-mentioned weak point, responds fast, is easy to control, suppress the effective parallel connection type harmonic synthesis restraining device of harmonic wave.
Technical solution of the present utility model is: a kind of parallel connection type harmonic synthesis restraining device, it is characterized in that: comprise that the harmonic wave that former limit is connected in parallel between electrical network and the load, secondary links to each other with the output of inverter circuit suppresses transformer, and the voltage sampling shaping circuit, SPWM pulse generation circuit, drive circuit and the inverter circuit that connect successively, two voltage transformers of this voltage sampling shaping circuit are received respectively between the output that grid side and harmonic wave suppress the secondary of transformer and inverter circuit.
Voltage sampling shaping circuit described in the utility model technical solution can comprise by two voltage transformers and the first-harmonic antiresonant circuit be made up of capacitor, inductor, to take out the voltage fundamental component.
The utility model since between electrical network and load harmonic wave in parallel suppress transformer, also be provided with the voltage sampling shaping circuit, SPWM pulse generation circuit, drive circuit and the inverter circuit that connect successively.The voltage sampling shaping circuit has two parts, 1, take out line voltage by instrument transformer after, through antiresonant circuit first-harmonic is separated, deliver to next stage through the buffer circuit of forming by operational amplifier; 2, the voltage that takes out from the inverter circuit output is delivered to next stage through the buffer circuit of operational amplifier composition.These two voltage signals are sent into stagnate loop control circuit and SPWM pulse generation circuit after relatively, generate the required SPWM pulse of inverter circuit, after amplifying, drive circuit sends into inverter circuit, the transformer secondary is received in the output of inverter circuit, like this at transformer former limit generation one and the equal-sized compensating fundamental wave voltage of secondary voltage fundametal compoment, make harmonic wave suppress transformer access point place first-harmonic is the voltage source characteristic, and the harmonic wave composition is the short-circuit impedance characteristic, thereby make fundamental current can not flow into active filter, the most of active filter that flows into of harmonic current, harmonic current is suppressed.
The utlity model has following characteristics: 1, only need to detect fundamental voltage from electrical network, frequency is single, and response is stable, realizes easily; 2, harmonic wave is suppressed transformers connected in parallel between electrical network and load, when bucking voltage is injected secondary, can make the access point of transformer that first-harmonic is the voltage source characteristic, and harmonic wave is the short-circuit impedance characteristic, thereby make fundamental current can not flow into active filter, the most of active filter that flows into of harmonic current, harmonic current is suppressed.The utility model is mainly used in Harmonious Waves in Power Systems and administers.
Description of drawings
Accompanying drawing is a circuit diagram of the present utility model.
Embodiment
As shown in the figure.The former limit that harmonic wave suppresses transformer 5 is connected in parallel between electrical network 6 and the load 7, and secondary links to each other with the output of inverter circuit 4.Voltage sampling shaping circuit 1 comprises buffer circuit, voltage transformer TV1, TV2 that two LM347 operational amplifier IC1, IC2 form and the first-harmonic antiresonant circuit of being made up of capacitor C 1, inductance L 1.SPWM pulse generation circuit 2 by inverter ic 3, ICA, the delay circuit that is made of resistance R 8, R9, capacitor C 5, C6, is formed with door 4081, and the signal that voltage sampling shaping circuit 1 is exported is divided into two-way SPWM pulse signal, is prior art.Drive circuit 3 is made up of EXB840 thick film integrated circuit and peripheral circuit, is prior art.Inverter circuit 4 is made up of two (or four) IGBTQ1, Q2.Power circuit partly is made up of rectification, filtering, is prior art.
Claims (2)
1, a kind of parallel connection type harmonic synthesis restraining device, it is characterized in that: comprise that the harmonic wave that former limit is connected in parallel between electrical network (6) and the load (7), secondary links to each other with the output of inverter circuit (4) suppresses transformer (5), and the voltage sampling shaping circuit (1), SPWM pulse generation circuit (2), drive circuit (3) and the inverter circuit (4) that connect successively, two voltage transformers (TV1, TV2) of this voltage sampling shaping circuit (1) are received respectively between the output of the secondary of electrical network (6) side and harmonic wave inhibition transformer (5) and inverter circuit (4).
2, a kind of parallel connection type harmonic synthesis restraining device according to claim 1 is characterized in that: described voltage sampling shaping circuit can comprise by two voltage transformers and the first-harmonic antiresonant circuit be made up of capacitor, inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03241470 CN2641886Y (en) | 2003-05-04 | 2003-05-04 | Parallel harmonic comprehensive suppressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03241470 CN2641886Y (en) | 2003-05-04 | 2003-05-04 | Parallel harmonic comprehensive suppressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2641886Y true CN2641886Y (en) | 2004-09-15 |
Family
ID=34292216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03241470 Expired - Fee Related CN2641886Y (en) | 2003-05-04 | 2003-05-04 | Parallel harmonic comprehensive suppressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2641886Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100414805C (en) * | 2005-09-28 | 2008-08-27 | 上海电力学院 | Solid synchronous voltage source for filtering |
| CN102624208A (en) * | 2012-04-23 | 2012-08-01 | 乐清市海鸟能源科技有限公司 | Harmonic suppression system and method of micropower grid-connected inverter |
-
2003
- 2003-05-04 CN CN 03241470 patent/CN2641886Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100414805C (en) * | 2005-09-28 | 2008-08-27 | 上海电力学院 | Solid synchronous voltage source for filtering |
| CN102624208A (en) * | 2012-04-23 | 2012-08-01 | 乐清市海鸟能源科技有限公司 | Harmonic suppression system and method of micropower grid-connected inverter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |