CN2831575Y - Low voltage electrical network dynamic purifier - Google Patents
Low voltage electrical network dynamic purifier Download PDFInfo
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- CN2831575Y CN2831575Y CN 200520092942 CN200520092942U CN2831575Y CN 2831575 Y CN2831575 Y CN 2831575Y CN 200520092942 CN200520092942 CN 200520092942 CN 200520092942 U CN200520092942 U CN 200520092942U CN 2831575 Y CN2831575 Y CN 2831575Y
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Abstract
The utility model relates to a dynamic purifier for a low-voltage electrical network. A detecting unit of the dynamic purifier detects the voltage and current signals of a load terminal and the three-phase output current of power modules, and sends detection signals into a control unit to make calculation. Output pulse signals trigger a large power switch tube S1-S6 in the power modules to generate current equal and opposite to harmonic current and reactive current in load current. Compensating current flows to load through a filter circuit. A sampling point for the current and voltage signals are arranged on the front end of an injecting point for the compensating current to form a closed loop control. The dynamic purifier can take the parallel way of the power modules of a host machine according to capacity of current to be compensated, has the advantages of high control precision and high reliability, and can flexibly increase and decrease installed capacity.
Description
Technical field
The utility model relates to electric and electronic technical field, a kind of Active Power Filter-APF low voltage electric network dynamic purification device.
Background technology
Harmonic wave is owing to non-linear electrical load produces, for example variable speed drives, rectification, UPS, computer, TV etc., and harmonic wave brings following problem for electrical network and user: influence the stable operation of supply line; Cable, motor and transformer are overheated; Capacitor super-load; Weak electricity system equipment is produced interference; The low tension switch misoperation; Fuse capacity reduces; Equipment and device premature aging; Influence the accuracy of power measurement.The excessive problem of bringing of reactive power: increase the power supply unit desired volume, increase unnecessary line loss; Line voltage is low excessively, influences exerting oneself of motor; Increase enterprise's electricity charge spending.
Above harmonic wave and reactive power are commonly referred to as electric network pollution to the problem that electrical network produced, and the measure that overcomes the above problems mainly contains following several aspect: 1) formulate corresponding standard and rules; 2) synchronous compensator; 3) passive filtering and passive reactive power compensation comprise series capacitor, shunt capacitor, LCR branch road in parallel, saturable reactor, Static Var Compensator SVC etc.Synchronous compensator can only be used for reactive power compensation, and its reaction speed is slow, mains by harmonics can obviously increase its loss.Passively compensated filter then has following deficiency: its filtering compensation characteristic depends on electrical network and load parameter, when these parameters are when often changing, the series parallel resonance of electrical network and filter may take place, and causes harmonic wave to amplify; Have negative voltage and adjust effect; Its parameter is selected relatively difficulty when the Passively compensated filter of design.
The Active Power Filter-APF development of being born at the end of the seventies in last century is rapid, and along with the progress of computer technology and power electronic technology constantly moves towards perfect.Active Power Filter-APF is a kind of multifunctional comprehensive compensation arrangement that is used for dynamically suppressing harmonic wave and dynamic compensation reactive power, on the principle based on advanced person's instantaneous reactive power theory, filter detects the size of load current in real time, subtract each other with it after calculating corresponding first-harmonic value, draw the harmonic current and the reactive current that need compensation, high-power electronic switch on the control inverter bridge makes it to export required offset current, reach the effect that suppresses harmonic wave and compensating reactive power, and the compensation characteristic of Active Power Filter-APF has nothing to do with electrical network and load parameter.The electric current of existing Active Power Filter-APF, voltage signal sampling point are behind the offset current decanting point, are open loop control, and its shortcoming is that control precision is low.
Summary of the invention
The purpose of this utility model is a kind of novel Active Power Filter-APF low voltage electric network dynamic purification device that proposes at the deficiencies in the prior art, this device can be according to the capacity of wanting offset current, take the main engine power module mode in parallel with the main engine power module, and electric current, voltage signal sampling point are before the offset current decanting point, constitute closed-loop control, the control precision height.
Low voltage electric network dynamic purification device, this device is made of detecting unit, control unit, drive circuit, power model and energy-storage travelling wave tube, filter circuit, detecting unit detects the three-phase output current of voltage, current signal and the power model of load end, and detection signal is sent into control unit; Is digital signal by the A/D converter in the control unit with analog signal conversion, carry out signal processing by CPU then, analytical calculation, output pulse signal is realized the triggering of power model, by drive circuit make high-power switch tube S1-S6 in the power model produce with load current in harmonic current and the electric current of reactive current opposite sign but equal magnitude, offset current flows to load through filter circuit; The filter circuit filtering is owing to the caused high order current component of high-power switch tube HF switch of inverter bridge in the power cell; Energy-storage travelling wave tube is made of capacitor C 1, C2, be used to provide the required energy of power model inverter bridge work, and charge by the inverse parallel diode D1-D6 of each high-power switch tube S1-S6 in the inverter bridge, it is characterized in that: electric current, voltage signal sampling point are located at offset current decanting point front end, constitute closed-loop control.
Described low voltage electric network dynamic purification device, it is characterized in that: this device is the capacity of offset current as required, takes the main engine power module mode in parallel with the main engine power module.
Described low voltage electric network dynamic purification device, it is characterized in that: detecting unit is made of voltage sensor, current sensor and voltage, current signal processing unit, three-phase current signal in the detecting unit or three-phase voltage signal are through the dq coordinate transform, become biphase current or voltage, through low-pass filtering, voltage-regulation, change three-phase current signal or three-phase voltage signal output into through the contravariant of dq coordinate more then.
The utlity model has following advantage: the control precision height; Can take the main engine power module mode in parallel according to the capacity of wanting offset current with the main engine power module.Syndeton of this device main circuit power model is simple, and control is convenient, increases and to reduce installed capacity flexible, and the reliability height is convenient to large-scale production.
1, according to the needs of scene compensation, power model can increase arbitrarily or reduce, and satisfies on-the-spot needs to compensation capacity.The real-time tracking ability is strong, and harmonic current and reactive power compensation are effective.
2, power factor height: cos φ 〉=0.98.
3, overload capacity: do not have the overload problem, when harmonic wave in the system is big, still can work on.
4, adaptive capacity: when system impedance and frequency generation fluctuation, can not influence compensation effect.
5, damping action: can not produce resonance or harmonic wave and amplify, and externally circuit oscillation has damping action.
6, low voltage electric network dynamic purification device not only can compensate lagging reactive power but also can compensate capacitive reactive power.
Description of drawings
Fig. 1 is a low voltage electric network dynamic purification device system architecture diagram.
Fig. 2 detecting unit block diagram.
Fig. 3 power model and energy-storage travelling wave tube winding diagram.
Fig. 4 control unit block diagram.
The winding diagram that Fig. 5 main frame is in parallel with the slave power model.
Embodiment
See Fig. 1, low voltage electric network dynamic purification device, this device is made of detecting unit, control unit, drive circuit, power model and energy-storage travelling wave tube, filter circuit, detecting unit detects the three-phase output current of voltage, current signal and the power model of load end, and detection signal is sent into control unit; Is digital signal by the A/D converter in the control unit with analog signal conversion, carry out signal processing by CPU then, analytical calculation, output pulse signal realizes that power model triggers, by drive circuit make high-power switch tube S1-S6 in the power model produce with load current in harmonic current and the electric current of reactive current opposite sign but equal magnitude, offset current flows to load through filter circuit; The filter circuit filtering is owing to the caused high order current component of high-power switch tube HF switch of inverter bridge in the power cell; Energy-storage travelling wave tube is made of capacitor C 1, C2, is used to provide the required energy of power model inverter bridge work, and charges by the inverse parallel diode D1-D6 of each high-power switch tube S1-S6 in the inverter bridge.
See Fig. 2, the three-phase current signal i in the detecting unit
La, i
Lb, i
Lc, (or three-phase voltage signal) through the dq coordinate transform, becomes biphase current i
d, i
q(or voltage) then through low-pass filtering, voltage-regulation, changes three-phase current signal i into through the contravariant of dq coordinate again
La, i
Lb, i
Lc(or three-phase voltage signal) output.
See Fig. 3, power component is formed inverter bridge by high-power switch tube SI-S6 and diode D1-D6 antiparallel with it, and the inverter bridge two ends are parallel with energy-storage travelling wave tube capacitor C 1, C2, and output connects power reactor L1, L2, L3.
See Fig. 4, after testing the current signal I of unit output
La, I
Lb, I
Lc, voltage signal U
a, U
b, U
cReach the direct voltage U at capacitor C1, C2 two ends
DcIs digital signal by the A/D converter in the control unit with analog signal conversion, carry out signal processing by CPU then, analytical calculation, output pulse signal realizes that power model triggers, by drive circuit make high-power switch tube S1-S6 in the power model produce with load current in harmonic current and the electric current of reactive current opposite sign but equal magnitude.
See Fig. 5, this device is the capacity of offset current as required, takes the mode of a plurality of power model parallel connections.
Claims (3)
1, low voltage electric network dynamic purification device, this device is made of detecting unit, control unit, drive circuit, power model and energy-storage travelling wave tube, filter circuit, detecting unit detects the three-phase output current of voltage, current signal and the power model of load end, and detection signal is sent into control unit; Is digital signal by the A/D converter in the control unit with analog signal conversion, carry out signal processing by CPU then, analytical calculation, output pulse signal is realized the triggering of power model, by drive circuit make high-power switch tube S1-S6 in the power model produce with load current in harmonic current and the electric current of reactive current opposite sign but equal magnitude, offset current flows to load through filter circuit; The filter circuit filtering is owing to the caused high order current component of high-power switch tube HF switch of inverter bridge in the power cell; Energy-storage travelling wave tube is made of capacitor C 1, C2, be used to provide the required energy of power model inverter bridge work, and charge by the inverse parallel diode D1-D6 of each high-power switch tube S1-S6 in the inverter bridge, it is characterized in that: electric current, voltage signal sampling point are located at offset current decanting point front end, constitute closed-loop control.
2, low voltage electric network dynamic purification device according to claim 1, it is characterized in that: this device is the capacity of offset current as required, takes the main engine power module mode in parallel with the main engine power module.
3, low voltage electric network dynamic purification device according to claim 1, it is characterized in that: detecting unit is made of voltage sensor, current sensor and voltage, current signal processing unit, three-phase current signal in the detecting unit or three-phase voltage signal are through the dq coordinate transform, become biphase current or voltage, through low-pass filtering, voltage-regulation, change three-phase current signal or three-phase voltage signal output into through the contravariant of dq coordinate more then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520092942 CN2831575Y (en) | 2005-10-20 | 2005-10-20 | Low voltage electrical network dynamic purifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520092942 CN2831575Y (en) | 2005-10-20 | 2005-10-20 | Low voltage electrical network dynamic purifier |
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| Publication Number | Publication Date |
|---|---|
| CN2831575Y true CN2831575Y (en) | 2006-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200520092942 Expired - Lifetime CN2831575Y (en) | 2005-10-20 | 2005-10-20 | Low voltage electrical network dynamic purifier |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326361A (en) * | 2012-03-20 | 2013-09-25 | 上海利思电气有限公司 | Low-voltage real-time dynamic active harmonic reactive power compensation cabinet |
| CN103326371A (en) * | 2012-03-20 | 2013-09-25 | 上海利思电气有限公司 | Static var generator based on self-adaption control of neural network |
| CN112491060A (en) * | 2020-11-20 | 2021-03-12 | 青岛鼎信通讯股份有限公司 | Power factor management method based on linear variable relation recognition device |
-
2005
- 2005-10-20 CN CN 200520092942 patent/CN2831575Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326361A (en) * | 2012-03-20 | 2013-09-25 | 上海利思电气有限公司 | Low-voltage real-time dynamic active harmonic reactive power compensation cabinet |
| CN103326371A (en) * | 2012-03-20 | 2013-09-25 | 上海利思电气有限公司 | Static var generator based on self-adaption control of neural network |
| CN112491060A (en) * | 2020-11-20 | 2021-03-12 | 青岛鼎信通讯股份有限公司 | Power factor management method based on linear variable relation recognition device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20061025 |
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| EXPY | Termination of patent right or utility model |