CN210577818U - Low-voltage reactive power compensation device - Google Patents
Low-voltage reactive power compensation device Download PDFInfo
- Publication number
- CN210577818U CN210577818U CN201921382882.7U CN201921382882U CN210577818U CN 210577818 U CN210577818 U CN 210577818U CN 201921382882 U CN201921382882 U CN 201921382882U CN 210577818 U CN210577818 U CN 210577818U
- Authority
- CN
- China
- Prior art keywords
- electrically connected
- electrode
- detection circuit
- resistor
- zero
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000001514 detection method Methods 0.000 claims abstract description 74
- 239000003990 capacitor Substances 0.000 claims abstract description 43
- 150000001875 compounds Chemical class 0.000 claims description 34
- 230000003287 optical effect Effects 0.000 claims description 15
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 2
- 230000002457 bidirectional effect Effects 0.000 description 12
- 239000002131 composite material Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Control Of Electrical Variables (AREA)
Abstract
The utility model provides a low pressure reactive power compensator, because thyristor both ends voltage is the alternating current sine wave, consequently, set up the zero cross detection circuit including positive zero cross detection circuit and negative-going zero cross detection circuit, in the positive half wave, detect the zero cross signal of positive half wave through positive zero cross detection circuit, when the negative half wave, detect the zero cross signal of negative half wave through negative phase detection circuit, and positive zero cross detection circuit and negative-going zero cross detection circuit have all adopted the current-limiting resistance limiting current, utilize the opto-coupler to combine the triode to catch the zero crossing, the low level signal that the opto-coupler luminous conduction output is exactly zero cross signal, can prevent through current-limiting resistance from strikeing the inrush current, the protection thyristor, can keep apart the harmonic of electric wire netting through the opto-coupler, reliability when improving capacitor reactive power compensation.
Description
Technical Field
The utility model relates to a reactive compensation technical field especially relates to a low pressure reactive power compensator.
Background
As the load of the distribution network increases, reactive fluctuations in the system will have a large impact on the voltage level and power factor of the distribution network, and the quality of power supply is seriously threatened. Therefore, in order to meet the increasing reactive power demand, it is necessary to perform reactive power compensation widely in the distribution network. The parallel capacitor obtained through analysis and comparison is the mainstream of reactive compensation at present due to good economical efficiency, easy and simple operation and simple maintenance. At present, the switching switch with the widest application is a composite switch formed by connecting a thyristor and a magnetic latching relay in parallel, and the composite switch is mainly switched on by switching on the magnetic latching relay when a voltage crosses a zero point in a switching-on process, wherein the voltage crossing point is a key of a circuit, while in a traditional low-voltage reactive compensation zero-crossing detection circuit, a structure as shown in fig. 1 is generally used, the circuit comprises 2 thyristor drivers MOC3083 connected in series, and under a normal condition, the MOC3083 can trigger the thyristor to be switched on when the voltage crosses the zero point, so that a capacitor is put into a power grid. However, in an actual power distribution network, harmonic waves exist in the power grid, the power grid is very complicated and irregular, and even voltage distortion occurs, and misoperation of the MOC3083 is easily caused. Due to the misoperation of the MOC3083, the capacitor cannot be accurately put into a power grid at the zero crossing point, so that great impact inrush current is caused, the thyristor is damaged, and the capacitor is possibly exploded in severe cases. Therefore, for solving the above problems, the utility model provides a low pressure reactive power compensator can improve the reliability when condenser reactive power compensation.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a low pressure reactive power compensator can improve the reliability when condenser reactive power compensation.
The technical scheme of the utility model is realized like this: the utility model provides a low-voltage reactive power compensation device, which comprises a DSP, a capacitor, a compound switch, a zero-crossing detection circuit and a thyristor trigger circuit, wherein the zero-crossing detection circuit comprises a positive zero-crossing detection circuit and a negative zero-crossing detection circuit;
the main electrode 1 and the main electrode 2 of the composite switch are respectively electrically connected with a power grid and a capacitor, the input end of a positive zero-crossing detection circuit is electrically connected with the main electrode 1 of the composite switch, the input end of a negative zero-crossing detection circuit is electrically connected with the main electrode 2 of the composite switch, the output end of the positive zero-crossing detection circuit and the output end of the negative zero-crossing detection circuit are both electrically connected with the same GPIO port of the DSP, the input end of a thyristor trigger circuit is electrically connected with an I/O port of the DSP, and the output end of the thyristor trigger circuit is electrically connected with a control electrode and a cathode of the composite switch.
On the basis of the above technical scheme, preferably, the zero-crossing detection circuit further comprises a current-limiting protection circuit and a clamping protection circuit;
the input end of the current-limiting protection circuit is electrically connected with a power grid, the output end of the current-limiting protection circuit is electrically connected with the power input ends of the positive zero-crossing detection circuit and the negative zero-crossing detection circuit respectively, and the two ends of the clamping protection circuit are electrically connected with the main electrodes 1 and 2 of the compound switch in a one-to-one correspondence mode.
On the basis of the above technical solution, preferably, the current-limiting protection circuit includes a resistor R33, a resistor R34, and a capacitor C27;
one end of the resistor R33 is electrically connected to the main electrode 1 of the compound switch, and the other end of the resistor R33 is electrically connected to one end of the resistor R34 and one end of the capacitor C27, respectively. The other end of the capacitor C27 is electrically connected with the main electrode 2 of the compound switch, and the other end of the resistor R34 is electrically connected with the power input ends of the positive zero-crossing detection circuit and the negative zero-crossing detection circuit, respectively.
Further preferably, the positive zero-crossing detection circuit comprises a diode VD4, a capacitor C29, a triode Q3, a triode Q4, an optocoupler isolator P2 and resistors R38-R40;
the positive electrode of the diode VD4 is electrically connected with the other end of the resistor R34 and one end of the resistor R40 respectively, the negative electrode of the diode VD4 is electrically connected with the main electrode 2 of the compound switch through the capacitor C29, the other end of the resistor R40 is electrically connected with the base electrode of the triode Q4, the collector electrode of the triode Q4 is electrically connected with the main electrode 2 of the compound switch through the resistor R39, the emitter electrode of the triode Q4 is electrically connected with the base electrode of the triode Q3, the emitter electrode of the triode Q3 is electrically connected with the negative electrode of the diode VD4, the collector electrode of the triode Q3 is electrically connected with the positive electrode of the emitting end of the optocoupler isolator P2, the negative electrode of the emitting end of the optocoupler isolator P2 is electrically connected with the main electrode 2 of the compound switch through the resistor R38, the E electrode of the receiving end of the optocoupler isolator P2 is electrically connected.
Further preferably, the clamping protection circuit comprises a diode VD2 and a diode VD3 which are connected in series in an opposite direction;
the anode of the diode VD2 is electrically connected to the other end of the resistor R34, the cathode of the diode VD2 is electrically connected to the cathode of the diode VD3, and the anode of the diode VD3 is electrically connected to the main electrode 2 of the compound switch.
Further preferably, the negative zero-crossing detection circuit comprises a diode VD1, a capacitor C28, a triode Q1, a triode Q2, an optocoupler isolator P1 and resistors R35-R37;
the positive electrode of the diode VD1 is electrically connected with one end of the resistor R35 and the main electrode 2 of the compound switch respectively, the negative electrode of the diode VD1 is electrically connected with the main electrode 1 of the compound switch through the capacitor C29, the other end of the resistor R35 is electrically connected with the base electrode of the triode Q1, the collector electrode of the triode Q1 is electrically connected with the other end of the resistor R34 through the resistor R36, the emitter electrode of the triode Q1 is electrically connected with the base electrode of the triode Q2, the emitter electrode of the triode Q2 is electrically connected with the negative electrode of the diode VD1, the collector electrode of the triode Q2 is electrically connected with the positive electrode of the emitting end of the optical coupling isolator P1, the negative electrode of the emitting end of the optical coupling isolator P2 is electrically connected with the main electrode 1 of the compound switch through the resistor R37, the receiving end E electrode of the optical coupling isolator P1 is electrically connected with the.
Further preferably, the DSP is TMS320F 28335;
and the receiving end E pole of the optical coupler isolator P1 and the receiving end E pole of the optical coupler isolator P2 are both electrically connected with the GPl03 port of the TMS320F 28335.
On the basis of the technical scheme, the device preferably further comprises a current acquisition circuit and a voltage acquisition circuit;
the input end of the current acquisition circuit and the input end of the voltage acquisition circuit are electrically connected with the power grid, and the output end of the current acquisition circuit and the output end of the voltage acquisition circuit are respectively electrically connected with the GPIO ports in a one-to-one correspondence manner.
The utility model discloses a low pressure reactive power compensator has following beneficial effect for prior art: (1) because the voltage at two ends of the thyristor is an alternating-current sine wave, the zero-crossing detection circuit comprising the positive zero-crossing detection circuit and the negative zero-crossing detection circuit is arranged, when the positive half wave occurs, the zero-crossing signal of the positive half wave is detected by the positive zero-crossing detection circuit, when the negative half wave occurs, the zero-crossing signal of the negative half wave occurs is detected by the negative phase detection circuit, the positive zero-crossing detection circuit and the negative zero-crossing detection circuit both adopt a current-limiting resistor to limit current, the zero-crossing point is captured by using an optical coupler in combination with a triode, the low-level signal output by the optical coupler luminous conduction is the zero-crossing signal, the impact inrush current can be prevented by the current-limiting resistor, the thyristor is protected, the harmonic wave.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a circuit diagram of a zero-crossing detection circuit in a conventional low-voltage reactive power compensation device;
fig. 2 is a structural diagram of a low-voltage reactive power compensation device of the present invention;
fig. 3 is a circuit diagram of a zero-crossing detection circuit in the low-voltage reactive power compensation device of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in fig. 2, the utility model discloses a low pressure reactive power compensator, it includes DSP, condenser, blend switch, zero cross detection circuit, thyristor trigger circuit, current acquisition circuit and voltage acquisition circuit.
In this embodiment, the DSP is a TMS320F28335 chip, and the TMS320F28335 chip functions in this embodiment: in the embodiment, the low level signal output by the zero-crossing detection circuit is the zero-crossing signal, and when the low level signal is detected, the thyristor trigger circuit is driven to work.
The compound switch is formed by connecting a bidirectional thyristor and a magnetic latching relay in parallel. The switching process of the compound switch is as follows: when the capacitor needs to be put into, when the zero-crossing detection circuit detects that the voltage of the two ends of the capacitor crosses the zero point, the DSP sends a control signal, the thyristor trigger circuit triggers the bidirectional thyristor to be conducted, after the circuit is stabilized, the magnetic latching relay K is closed, the voltage of the two ends of the magnetic latching relay K is equal to the voltage of the two ends of the bidirectional thyristor and is about 0.7V, and therefore the phenomenon of arcing of the magnetic latching relay K is avoided. After the magnetic latching relay K is stably closed, the DSP sends out a signal to turn off the bidirectional thyristor, and after the bidirectional thyristor is turned off, the working current of the capacitor is born by the magnetic latching relay K; when the capacitor needs to be cut off, the DSP sends out a trigger signal to conduct the bidirectional thyristor, so that the magnetic latching relay K and the bidirectional thyristor are conducted simultaneously. After the circuit is stabilized, the magnetic latching relay K is switched off, the bidirectional thyristor bears the working current of the capacitor at the moment, finally the trigger signal of the bidirectional thyristor is removed, and the thyristor can be naturally switched off at the moment of zero crossing of the current.
The important point in the switching process of the compound switch is to detect whether the voltage at two ends of the bidirectional thyristor crosses zero points. Because 2 thyristor drivers MOC3083 connected in series are used in the traditional zero-crossing detection circuit, under the normal condition, the MOC3083 can trigger the thyristors to conduct when the voltage crosses zero, so that the capacitor is put into a power grid. However, in an actual power distribution network, harmonic waves exist in a power grid, the power grid is very complex and irregular, and even voltage distortion occurs, and the harmonic waves easily cause optical couplers to malfunction. Due to the misoperation of the MOC3083, the capacitor cannot be accurately put into a power grid at the zero crossing point, so that great impact inrush current is caused, the thyristor is damaged, and the capacitor is possibly exploded in severe cases. Therefore, the present embodiment provides a new zero-crossing detection circuit, which specifically includes a positive zero-crossing detection circuit, a negative zero-crossing detection circuit, a current-limiting protection circuit, and a clamp protection circuit. As shown in fig. 2, a main electrode 1 and a main electrode 2 of the composite switch are electrically connected to a power grid and a capacitor, respectively, an input end of a positive zero-crossing detection circuit is electrically connected to the main electrode 1 of the composite switch, an input end of a negative zero-crossing detection circuit is electrically connected to the main electrode 2 of the composite switch, and an output end of the positive zero-crossing detection circuit and an output end of the negative zero-crossing detection circuit are both electrically connected to the same GPIO port of the DSP. The input end of the current-limiting protection circuit is electrically connected with a power grid, the output end of the current-limiting protection circuit is electrically connected with the power input ends of the positive zero-crossing detection circuit and the negative zero-crossing detection circuit respectively, and the two ends of the clamping protection circuit are electrically connected with the main electrodes 1 and 2 of the compound switch in a one-to-one correspondence mode. The input end of the current acquisition circuit and the input end of the voltage acquisition circuit are electrically connected with the power grid, and the output end of the current acquisition circuit and the output end of the voltage acquisition circuit are respectively electrically connected with the GPIO ports in a one-to-one correspondence manner.
The voltage at two ends of the compound switch is an alternating-current sine wave, a positive zero-crossing detection circuit detects a zero signal when the voltage is positive half waves, a negative zero-crossing detection circuit detects the zero signal when the voltage is negative half waves, and a current limiting protection circuit limits current through a current limiting resistor to play a role in protecting a post-stage circuit; the clamp protection circuit is arranged between the positive zero-crossing detection circuit and the negative zero-crossing detection circuit and plays a role in clamping voltage.
In the present embodiment, as shown in fig. 3, the current-limiting protection circuit includes a resistor R33, a resistor R34, and a capacitor C27; one end of the resistor R33 is electrically connected to the main electrode 1 of the compound switch, and the other end of the resistor R33 is electrically connected to one end of the resistor R34 and one end of the capacitor C27, respectively. The other end of the capacitor C27 is electrically connected with the main electrode 2 of the compound switch, and the other end of the resistor R34 is electrically connected with the power input ends of the positive zero-crossing detection circuit and the negative zero-crossing detection circuit, respectively. The resistor R33 and the resistor R34 are current-limiting resistors, and the capacitor C27 is a filter capacitor.
As shown in fig. 3, the positive zero-crossing detection circuit includes: the device comprises a diode VD4, a capacitor C29, a triode Q3, a triode Q4, an optocoupler isolator P2 and resistors R38-R40; specifically, the anode of the diode VD4 is electrically connected to the other end of the resistor R34 and one end of the resistor R40, the cathode of the diode VD4 is electrically connected to the main electrode 2 of the combination switch through the capacitor C29, the other end of the resistor R40 is electrically connected to the base of the transistor Q4, the collector of the transistor Q4 is electrically connected to the main electrode 2 of the combination switch through the resistor R39, the emitter of the transistor Q4 is electrically connected to the base of the transistor Q3, the emitter of the transistor Q3 is electrically connected to the cathode of the diode VD4, the collector of the transistor Q3 is electrically connected to the emitter of the opto-isolator P2, the cathode of the emitter of the opto-isolator P2 is electrically connected to the main electrode 2 of the combination switch through the resistor R38, the receiver E of the opto-isolator P2 is electrically connected to the GPIO port of the DSP, and the receiver C of the opto-isolator P2 is. When the voltage at two ends of the compound switch is in a positive half-wave state, the diode VD4 is conducted, the power grid side starts to charge the capacitor C29, so that the polarity of the capacitor C29 is positive at the top and negative at the bottom, at the moment, the capacitor C29 can be regarded as a power supply to supply power to the triodes Q3 and Q4, when the voltage crosses zero, the Q3 and the Q4 are triggered to be conducted, then the P2 is triggered to conduct the optocoupler isolator to pull down the output voltage of the positive zero-crossing detection circuit, the low-level signal output by the positive zero-crossing detection circuit is a zero-point signal, the zero-point signal is output to a GPIO3 port of the TMS320F28335 chip, and the TMS320F28335 chip.
In the present embodiment, as shown in fig. 3, the clamp protection circuit includes a diode VD2 and a diode VD3 connected in reverse series; the anode of the diode VD2 is electrically connected to the other end of the resistor R34, the cathode of the diode VD2 is electrically connected to the cathode of the diode VD3, and the anode of the diode VD3 is electrically connected to the main electrode 2 of the compound switch.
As shown in fig. 3, the negative zero-crossing detection circuit includes: the circuit comprises a diode VD1, a capacitor C28, a triode Q1, a triode Q2, an optocoupler isolator P1 and resistors R35-R37; specifically, the anode of the diode VD1 is electrically connected to one end of the resistor R35 and the main electrode 2 of the combination switch, the cathode of the diode VD1 is electrically connected to the main electrode 1 of the combination switch through the capacitor C29, the other end of the resistor R35 is electrically connected to the base of the triode Q1, the collector of the triode Q1 is electrically connected to the other end of the resistor R34 through the resistor R36, the emitter of the triode Q1 is electrically connected to the base of the triode Q2, the emitter of the triode Q2 is electrically connected to the cathode of the diode VD1, the collector of the triode Q2 is electrically connected to the emitter of the opto-isolator P1, the cathode of the emitter of the opto-isolator P2 is electrically connected to the main electrode 1 of the combination switch through the resistor R37, the receiver E of the opto-isolator P1 is electrically connected to the GPIO port of the DSP, and the receiver C of the opto-isolator P1 is. The working principle is as follows: when the voltage at two ends of the compound switch is in negative half-wave and the voltage is zero, the optical coupling isolator P1 is conducted to pull down the output voltage of the negative zero-crossing detection circuit, the low-level signal output by the negative zero-crossing detection circuit is a zero-point signal, the zero-point signal is output to a GPIO3 port of the TMS320F28335 chip, and the TMS320F28335 chip controls the thyristor trigger circuit to trigger the bidirectional thyristor. According to the fact that the optical coupling isolators P2 and P1 can detect positive zero crossing points and negative zero crossing points respectively by combining a positive zero crossing detection circuit and a negative zero crossing detection circuit, when a low-level signal is detected at an output end, the zero crossing point is a voltage zero crossing point, and when the signal is captured by a DSP, a control signal is sent out to trigger a thyristor to be conducted.
In this embodiment, the thyristor trigger circuit receives the control signal from the DSP and drives the bidirectional thyristor in the composite switch to conduct.
The current acquisition circuit and the voltage acquisition circuit respectively acquire alternating current signals and alternating voltage signals in a power grid, and are generally realized by using a current transformer and a voltage transformer, and in the embodiment, the improvement on the current acquisition circuit and the voltage acquisition circuit is not involved, so that the circuit can be realized by using the traditional current acquisition circuit and the traditional voltage acquisition circuit, and therefore, the description is not repeated here.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a low pressure reactive power compensator, its includes DSP, condenser, blend switch, zero cross detection circuit and thyristor trigger circuit, its characterized in that: the zero-crossing detection circuit comprises a positive zero-crossing detection circuit and a negative zero-crossing detection circuit;
the main electrode 1 and the main electrode 2 of the compound switch are respectively electrically connected with a power grid and a capacitor, the input end of a positive zero-crossing detection circuit is electrically connected with the main electrode 1 of the compound switch, the input end of a negative zero-crossing detection circuit is electrically connected with the main electrode 2 of the compound switch, the output ends of the positive zero-crossing detection circuit and the negative zero-crossing detection circuit are both electrically connected with the same GPIO port of the DSP, the input end of a thyristor trigger circuit is electrically connected with an I/O port of the DSP, and the output end of the thyristor trigger circuit is electrically connected with a control electrode and a cathode of the compound switch.
2. A low voltage reactive power compensator according to claim 1, wherein: the zero-crossing detection circuit also comprises a current-limiting protection circuit and a clamping protection circuit;
the input end of the current-limiting protection circuit is electrically connected with a power grid, the output end of the current-limiting protection circuit is electrically connected with the power input ends of the positive zero-crossing detection circuit and the negative zero-crossing detection circuit respectively, and two ends of the clamping protection circuit are electrically connected with the main electrodes 1 and 2 of the compound switch in a one-to-one correspondence mode.
3. A low voltage reactive power compensator according to claim 2, wherein: the current-limiting protection circuit comprises a resistor R33, a resistor R34 and a capacitor C27;
one end of the resistor R33 is electrically connected with the main electrode 1 of the compound switch, the other end of the resistor R33 is electrically connected with one end of the resistor R34 and one end of the capacitor C27 respectively, the other end of the capacitor C27 is electrically connected with the main electrode 2 of the compound switch, and the other end of the resistor R34 is electrically connected with the power supply input ends of the positive zero-crossing detection circuit and the negative zero-crossing detection circuit respectively.
4. A low voltage reactive power compensator according to claim 3, wherein: the forward zero-crossing detection circuit comprises a diode VD4, a capacitor C29, a triode Q3, a triode Q4, an optocoupler isolator P2 and resistors R38-R40;
the positive electrode of the diode VD4 is electrically connected with the other end of the resistor R34 and one end of the resistor R40 respectively, the negative electrode of the diode VD4 is electrically connected with the main electrode 2 of the compound switch through a capacitor C29, the other end of the resistor R40 is electrically connected with the base electrode of the triode Q4, the collector electrode of the triode Q4 is electrically connected with the main electrode 2 of the compound switch through a resistor R39, the emitter electrode of the triode Q4 is electrically connected with the base electrode of the triode Q3, the emitter electrode of the triode Q3 is electrically connected with the negative electrode of the diode VD4, the collector electrode of the triode Q3 is electrically connected with the positive electrode of the emitting end of the optocoupler isolator P2, the negative electrode of the emitting end of the optocoupler isolator P2 is electrically connected with the main electrode 2 of the compound switch through a resistor R38, the E electrode of the receiving end of the optocoupler isolator P2 is electrically connected with.
5. The low-voltage reactive power compensation device according to claim 4, wherein: the clamping protection circuit comprises a diode VD2 and a diode VD3 which are connected in series in the reverse direction;
the anode of the diode VD2 is electrically connected to the other end of the resistor R34, the cathode of the diode VD2 is electrically connected to the cathode of the diode VD3, and the anode of the diode VD3 is electrically connected to the main electrode 2 of the combination switch.
6. The low-voltage reactive power compensation device according to claim 5, wherein: the negative zero-crossing detection circuit comprises a diode VD1, a capacitor C28, a triode Q1, a triode Q2, an optocoupler isolator P1 and resistors R35-R37;
the positive electrode of the diode VD1 is electrically connected with one end of the resistor R35 and the main electrode 2 of the compound switch respectively, the negative electrode of the diode VD1 is electrically connected with the main electrode 1 of the compound switch through the capacitor C29, the other end of the resistor R35 is electrically connected with the base electrode of the triode Q1, the collector electrode of the triode Q1 is electrically connected with the other end of the resistor R34 through the resistor R36, the emitter electrode of the triode Q1 is electrically connected with the base electrode of the triode Q2, the emitter electrode of the triode Q2 is electrically connected with the negative electrode of the diode VD1, the collector electrode of the triode Q2 is electrically connected with the positive electrode of the emitting end of the optical coupling isolator P1, the negative electrode of the emitting end of the optical coupling isolator P2 is electrically connected with the main electrode 1 of the compound switch through the resistor R37, the E electrode of the receiving end of the optical coupling isolator P1 is electrically connected with.
7. A low voltage reactive power compensator according to claim 6, wherein: the DSP is TMS320F 28335;
and the receiving end E pole of the optical coupler isolator P1 and the receiving end E pole of the optical coupler isolator P2 are electrically connected with the GPl03 port of the TMS320F 28335.
8. A low voltage reactive power compensator according to claim 1, wherein: the device also comprises a current acquisition circuit and a voltage acquisition circuit;
the input end of the current acquisition circuit and the input end of the voltage acquisition circuit are electrically connected with a power grid, and the output end of the current acquisition circuit and the output end of the voltage acquisition circuit are respectively electrically connected with the GPIO ports in a one-to-one correspondence mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921382882.7U CN210577818U (en) | 2019-08-24 | 2019-08-24 | Low-voltage reactive power compensation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921382882.7U CN210577818U (en) | 2019-08-24 | 2019-08-24 | Low-voltage reactive power compensation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210577818U true CN210577818U (en) | 2020-05-19 |
Family
ID=70640282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921382882.7U Expired - Fee Related CN210577818U (en) | 2019-08-24 | 2019-08-24 | Low-voltage reactive power compensation device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210577818U (en) |
-
2019
- 2019-08-24 CN CN201921382882.7U patent/CN210577818U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205811508U (en) | A kind of output overcurrent protection circuit | |
| CN205484496U (en) | Voltage transformer with output protection | |
| CN202111457U (en) | Three-phase power supply input side phase lack power failure detection protection circuit | |
| CN206727643U (en) | A kind of under-voltage and overvoltage crowbar | |
| CN210577818U (en) | Low-voltage reactive power compensation device | |
| CN102868143B (en) | A kind of overcurrent protection circuit of push-pull converter | |
| CN106099842A (en) | A kind of reversal connection or short-circuit protection circuit | |
| CN105958844A (en) | Intelligent soft switching power supply realization method and intelligent soft switching power supply | |
| CN103186106B (en) | A kind of high voltage direct current control switch | |
| CN200987070Y (en) | Phase lacking protection circuit for Intermediate voltage frequency-changing speed regulator | |
| CN204131385U (en) | Switching Power Supply current foldback circuit | |
| CN203774767U (en) | Cut-off type fault protection circuit of unity power factor boost converter | |
| CN206546404U (en) | A kind of level pressure power amplifier short-circuit detecting circuit based on comparator | |
| CN104953537A (en) | Overload protection switching device | |
| CN108696111A (en) | A kind of multiple-channel output is under-voltage and short-circuit protection circuit | |
| CN204992525U (en) | Undervoltage protection circuit of delaying of switch electrical apparatus | |
| CN204290469U (en) | High-power duplicate supply switches and protective device | |
| CN208316403U (en) | There is one kind counnter attack to fill power supply automatic switchover without crushing output circuit | |
| CN209329700U (en) | A kind of three-phase commutation circuit and device | |
| CN208781740U (en) | A kind of relay and its zero passage detection arc-suppression circuit for alternating-current charging pile | |
| CN103023044A (en) | Combination switch with intelligent zero-crossing switching function | |
| CN205789730U (en) | A kind of relay drive circuit | |
| CN208675104U (en) | A kind of multiple-channel output is under-voltage and short-circuit protection circuit | |
| CN102136380A (en) | Arc extinction combination switch with rectifier tube | |
| CN207572981U (en) | Power-capacitance hurl-slices switch and capacitor compensation cabinet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200519 |