CN114039381A - Flexible grid-connected device and method for three-phase four-wire active filter module - Google Patents
Flexible grid-connected device and method for three-phase four-wire active filter module Download PDFInfo
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- CN114039381A CN114039381A CN202111389018.1A CN202111389018A CN114039381A CN 114039381 A CN114039381 A CN 114039381A CN 202111389018 A CN202111389018 A CN 202111389018A CN 114039381 A CN114039381 A CN 114039381A
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- relay
- signal
- action signal
- module
- active filter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Power Conversion In General (AREA)
Abstract
The invention provides a flexible grid-connected device and a flexible grid-connected method for a three-phase four-wire active filter module, which have the advantages of simple circuit, low cost, high reliability, space saving, capability of effectively reducing impact on a power grid and equipment protection; the active filter module comprises a direct current energy storage unit, a rectification inversion unit, an LCL filter unit and a switch control unit which are sequentially connected, wherein the switch control unit comprises a relay, and the active filter module also comprises a processing module which is used for sending a relay action signal and a relay allowed action signal; the voltage zero-crossing detection module is connected with the contact end of the relay and used for detecting the falling edge of the voltage zero-crossing signal at the two ends of the relay and sending the falling edge signal to the processing module to be used as a relay allowed action signal; and the driving module is connected with the relay coil end and the processing module and used for receiving the relay action signal and the relay allowable action signal sent by the processing module and driving the relay to work.
Description
Technical Field
The invention relates to the technical field of active filters, in particular to a flexible grid-connected device and method for a three-phase four-wire active filter module.
Background
The active filter module generally includes a dc energy storage unit, a rectification inverter unit, an LCL filter unit, and a switch control unit, when the active filter module is connected to the power grid, at an initial time, the voltage on the dc energy storage unit is 0V, so the voltage difference between the dc energy storage unit and the power grid may be 0 to grid voltage √ 2 (i.e., the voltage difference between two ends of a relay on the switch control unit), wherein the larger the voltage difference between the dc energy storage unit and the power grid, the larger the impulse current when the power grid is connected is, the larger the impact will be caused to the power grid loop, and even the other power consumption devices will be affected.
The existing solution is generally a mode of serially connecting a low-resistance and high-power starting resistor, when a direct current side is charged to a certain voltage, the resistor is bypassed by a relay, the mode is relatively simple, but in the starting process, the resistor generates large loss, and if the selected resistor is too large, the relay fails due to the voltage drop at two ends of the resistor at the moment of attraction; if the resistance is too small, the current-limiting effect cannot be achieved, even the resistance can be burnt out, the reliability is not high, and the volume of a general high-power starting resistor is larger, so that a larger space is occupied.
Disclosure of Invention
Aiming at the problems, the invention provides a flexible grid-connected device and method for a three-phase four-wire active filter module, which have the advantages of simple circuit, low cost, high reliability, space saving, capability of effectively reducing the impact on a power grid and equipment protection.
The technical scheme is that, a be used for flexible device that is incorporated into power networks of three-phase four-wire system active filter module, its active filter module including the access electric wire netting, the active filter module is including the direct current energy storage unit, rectification contravariant unit, LCL filter unit and the on-off control unit that connect electrically in proper order, the on-off control unit includes the relay, its characterized in that: the device also comprises a processing module used for sending out a relay action signal and a relay permission action signal;
the voltage zero-crossing detection module is connected with the relay contact end and used for detecting the falling edge of the voltage zero-crossing signal at the two ends of the relay and sending the falling edge signal to the processing module to be used as a relay allowed action signal;
and the driving module is connected with the relay coil end and the processing module and is used for receiving the relay action signal and the relay allowable action signal sent by the processing module and driving the relay to work.
It is further characterized in that:
the processing module comprises a signal processor DSP; the voltage zero-crossing detection module comprises resistors R1-R4 and a photoelectric coupler U1, wherein one ends of the resistors R1 and R2 are correspondingly connected to two ends of the relay contact respectively, the other ends of the resistors R1 and R2 are correspondingly connected to pins 1 and 2 of the photoelectric coupler U1 respectively, a pin 4 of the photoelectric coupler U1 is connected with a power supply VCC1, a pin 3 of the photoelectric coupler U1 is connected with one ends of the resistors R3 and R4 respectively, the other end of the resistor R3 is grounded, and the other end of the resistor R4 is connected with the signal processor DSP;
the driving module comprises an AND gate U2, resistors R5, R6 and a triode N1, a relay action signal and a relay permission action signal sent by the signal processor DSP are respectively and correspondingly connected to two input ends of the AND gate U2, an output end of the AND gate U2 is connected with a base electrode of the triode N1 after being connected with the resistor R5, an emitter electrode of the triode N1 is connected with the resistor R6 and then is grounded, a collector electrode of the triode N1 is connected with one end of a relay coil, and the other end of the relay coil is connected with a driving power supply VCC 2;
a flexible grid connection method for a three-phase four-wire active filter module is characterized by comprising the following steps:
s1, the signal processor DSP sends out a relay action instruction and gives out a relay action signal;
s2, the signal processor DSP detects the falling edge of the voltage zero-crossing signal at the two ends of the relay through the voltage zero-crossing detection module and gives a relay allowed action signal;
and S3, sending the relay action signal and the relay permission action signal sent by the signal processor DSP to the driving module to drive the relay to work.
It is further characterized in that:
in the step S2, when the voltage at one end of the relay contact detected by the voltage zero-crossing detection module is greater than the voltage at the other end, the photocoupler U1 is turned on, and the 3-pin terminal of the photocoupler U1 outputs a high level; when the voltage difference between the two ends of the relay contact is smaller than the turn-on voltage of the photoelectric coupler U1, the photoelectric coupler U1 is cut off, the 3-pin end of the photoelectric coupler U1 outputs low level, and a falling edge signal in the conversion process is sent to the signal processor DSP and serves as a relay permission action signal sent to the driving module.
The invention has the advantages of simple circuit, low cost, high reliability and space saving, and the voltage zero-crossing detection module is used for detecting the falling edge of the voltage zero-crossing signal at the two ends of the relay, wherein the falling edge signal is the signal shown when the voltage at the two ends of the relay passes through zero, and is connected to the grid at the moment, so that the impact current to the power grid can be reduced to a small range, thereby effectively protecting equipment and having better economic use value.
Drawings
FIG. 1 is an operational flow diagram of the present invention;
FIG. 2 is a circuit schematic of the active filter module of the present invention;
FIG. 3 is a circuit schematic of the voltage zero crossing detection module of the present invention;
fig. 4 is a circuit schematic of the driving module of the present invention.
Detailed Description
As shown in fig. 1 to 4, the flexible grid connection device for a three-phase four-wire active filter module according to the present invention includes an active filter module connected to a power grid, where the active filter module includes a dc energy storage unit, a rectification inverter unit, an LCL filter unit, and a Switch control unit, which are electrically connected in sequence, and the Switch control unit includes a Relay, and further includes a processing module for sending a Relay action signal (Switch) and a Relay allowed action signal (Zero);
the voltage zero-crossing detection module is connected with the contact end of the relay and used for detecting the falling edge of the voltage zero-crossing signal at the two ends of the relay and sending the falling edge signal to the processing module to be used as a relay allowed action signal;
and the driving module is connected with the relay coil end and the processing module and used for receiving the relay action signal and the relay allowable action signal sent by the processing module and driving the relay to work.
The processing module comprises a signal processor DSP; the voltage zero-crossing detection module comprises resistors R1-R4 and a photoelectric coupler U1, one ends of the resistors R1 and R2 are respectively and correspondingly connected with two ends of a relay contact, the other ends of the resistors R1 and R2 are respectively and correspondingly connected with pins 1 and 2 of the photoelectric coupler U1, and a pin 4 of the photoelectric coupler U1 is connected with a power supply VCC1 and is generally 3.3 VD; the pin 3 of the photoelectric coupler U1 is connected with one end of each of the resistors R3 and R4, the other end of the resistor R3 is grounded, and the other end of the resistor R4 is connected with the signal processor DSP.
The driving module comprises an AND gate U2, a resistor R5, a resistor R6 and a triode N1, a relay action signal and a relay permission action signal sent by a signal processor DSP are respectively and correspondingly connected with two input ends of the AND gate U2, an output end of the AND gate U2 is connected with a base electrode of the triode N1 after passing through a connecting resistor R5, an emitter electrode of the triode N1 is grounded after passing through a connecting resistor R6, a collector electrode of the triode N1 is connected with one end of a relay coil, the other end of the relay coil is connected with a driving power supply VCC2, the VCC2 is a relay coil driving power supply, and the driving power supply is determined according to the specification of a relay and is generally 12VDC or 24 VDC.
Because the impact on the power grid depends on the closing time point of the relay, the larger the pressure difference between two ends of the relay is, the larger the impact current is when the grid is connected, and the ideal power-on time is when the pressure difference is 0V, namely, if the grid is connected at the moment when the differential pressure between the two ends of the relay is small, the impact on the power grid is small, otherwise, the impact is large, therefore, to make the grid-connected impact current small, the core is the switching time node of the control relay, the falling edge signal is a signal which is shown when the voltage at two ends of the relay is zero (the voltage difference at two ends of the relay is very small at the moment), that is, the voltage difference at two ends of the relay at the moment can be known to be very small only by detecting the falling edge moment, so that the grid-connected condition is met, the grid connection can be carried out at the moment, and the invention realizes a grid connection method with the pressure difference of about 0V, namely, the impact current to the power grid can be reduced to a small range during grid connection.
Specifically, the flexible grid connection method for the three-phase four-wire active filter module comprises the following steps:
s1, the signal processor DSP sends out a relay action instruction and gives out a relay action signal (Switch);
s2, the signal processor DSP detects the falling edge of the voltage Zero-crossing signal at the two ends of the relay through the voltage Zero-crossing detection module and gives out a relay allowed action signal (Zero);
the generation of the relay enable action signal (Zero) is specifically: when the voltage at the P1 side detected by the voltage zero-crossing detection module is greater than the voltage at the P2 side (the on-off voltage drops of the optocouplers of different models are different), the optocoupler U1 is switched on, and the 3-pin end of the optocoupler U1 outputs a high level; when the voltage difference between the two ends of the relay contact is smaller than the turn-on voltage of the photoelectric coupler U1, namely the voltage on the P1 side is close to the voltage on the P2 side, the photoelectric coupler U1 is cut off, the 3-pin end of the photoelectric coupler U1 outputs low level, a falling edge signal in the conversion process is sent to the signal processor DSP and serves as a relay allowable action signal sent to the driving module;
s3, a Relay action signal (Switch) and a Relay permission action signal (Zero) sent by the signal processor DSP are respectively sent to two input ends of an AND gate U2, and then a Relay is driven to work through a triode N1, namely, grid connection is carried out.
In the figure, P1 and P2 are voltage zero-crossing detection interfaces at two ends of a Relay;
RLY + and RLY-are Relay coil driving pins.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. The utility model provides a be used for flexible device that is incorporated into power networks of three-phase four-wire system active filter module, its is including the active filter module who inserts the electric wire netting, the active filter module is including the direct current energy storage unit, rectification inverter unit, LCL filter unit and the on-off control unit that connect electrically in proper order, the on-off control unit includes relay, its characterized in that: the device also comprises a processing module used for sending out a relay action signal and a relay permission action signal;
the voltage zero-crossing detection module is connected with the relay contact end and used for detecting the falling edge of the voltage zero-crossing signal at the two ends of the relay and sending the falling edge signal to the processing module to be used as a relay allowed action signal;
and the driving module is connected with the relay coil end and the processing module and is used for receiving the relay action signal and the relay allowable action signal sent by the processing module and driving the relay to work.
2. The flexible grid-connected device for the three-phase four-wire active filter module according to claim 1, characterized in that: the processing module comprises a signal processor DSP; the voltage zero-crossing detection module comprises resistors R1-R4 and a photoelectric coupler U1, one ends of the resistors R1 and R2 are correspondingly connected to two ends of a relay contact respectively, the other ends of the resistors R1 and R2 are correspondingly connected to pins 1 and 2 of the photoelectric coupler U1 respectively, a pin 4 of the photoelectric coupler U1 is connected with a power supply VCC1, a pin 3 of the photoelectric coupler U1 is connected with one ends of the resistors R3 and R4 respectively, the other end of the resistor R3 is grounded, and the other end of the resistor R4 is connected to the signal processor DSP.
3. The flexible grid-connected device for the three-phase four-wire active filter module according to claim 2, characterized in that: the driving module comprises an AND gate U2, resistors R5, R6 and a triode N1, a relay action signal and a relay permission action signal sent by the signal processor DSP are respectively and correspondingly connected to two input ends of the AND gate U2, an output end of the AND gate U2 is connected with a base electrode of the triode N1 after being connected with the resistor R5, an emitter electrode of the triode N1 is connected with the resistor R6 and then is grounded, a collector electrode of the triode N1 is connected with one end of a relay coil, and the other end of the relay coil is connected with a driving power supply VCC 2.
4. A flexible grid-connection method for a three-phase four-wire active filter module is characterized by comprising the flexible grid-connection device for the three-phase four-wire active filter module as claimed in any one of claims 1 to 3, and the grid-connection method comprises the following steps:
s1, the signal processor DSP sends out a relay action instruction and gives out a relay action signal;
s2, the signal processor DSP detects the falling edge of the voltage zero-crossing signal at the two ends of the relay through the voltage zero-crossing detection module and gives a relay allowed action signal;
and S3, sending the relay action signal and the relay permission action signal sent by the signal processor DSP to the driving module to drive the relay to work.
5. The flexible grid-connection method for the three-phase four-wire active filter module according to claim 4, characterized in that: in the step S2, when the voltage at one end of the relay contact detected by the voltage zero-crossing detection module is greater than the voltage at the other end, the photocoupler U1 is turned on, and the 3-pin terminal of the photocoupler U1 outputs a high level; when the voltage difference between the two ends of the relay contact is smaller than the turn-on voltage of the photoelectric coupler U1, the photoelectric coupler U1 is cut off, the 3-pin end of the photoelectric coupler U1 outputs low level, and a falling edge signal in the conversion process is sent to the signal processor DSP and serves as a relay permission action signal sent to the driving module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111389018.1A CN114039381A (en) | 2021-11-22 | 2021-11-22 | Flexible grid-connected device and method for three-phase four-wire active filter module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111389018.1A CN114039381A (en) | 2021-11-22 | 2021-11-22 | Flexible grid-connected device and method for three-phase four-wire active filter module |
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| Publication Number | Publication Date |
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| CN114039381A true CN114039381A (en) | 2022-02-11 |
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| CN202111389018.1A Pending CN114039381A (en) | 2021-11-22 | 2021-11-22 | Flexible grid-connected device and method for three-phase four-wire active filter module |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202749303U (en) * | 2012-07-16 | 2013-02-20 | 苏州工业园区和顺电气股份有限公司 | Power control circuit for relay driving module |
| CN105813353A (en) * | 2016-05-11 | 2016-07-27 | 广东好太太智能科技有限公司 | Protection circuit and method for intelligently eliminating impact of UV lamp |
| CN106300351A (en) * | 2016-09-09 | 2017-01-04 | 东南大学 | A kind of can the active filter of radio communication |
| CN209946327U (en) * | 2019-03-29 | 2020-01-14 | 泰科电子(上海)有限公司 | Detection circuit of relay contact and power supply device |
| CN211702011U (en) * | 2020-04-08 | 2020-10-16 | 广州东霖电子有限公司 | Relay control device and electrical apparatus |
-
2021
- 2021-11-22 CN CN202111389018.1A patent/CN114039381A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202749303U (en) * | 2012-07-16 | 2013-02-20 | 苏州工业园区和顺电气股份有限公司 | Power control circuit for relay driving module |
| CN105813353A (en) * | 2016-05-11 | 2016-07-27 | 广东好太太智能科技有限公司 | Protection circuit and method for intelligently eliminating impact of UV lamp |
| CN106300351A (en) * | 2016-09-09 | 2017-01-04 | 东南大学 | A kind of can the active filter of radio communication |
| CN209946327U (en) * | 2019-03-29 | 2020-01-14 | 泰科电子(上海)有限公司 | Detection circuit of relay contact and power supply device |
| CN211702011U (en) * | 2020-04-08 | 2020-10-16 | 广州东霖电子有限公司 | Relay control device and electrical apparatus |
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