CN111478662B - Discharging method of solar power station pressurizing device - Google Patents
Discharging method of solar power station pressurizing device Download PDFInfo
- Publication number
- CN111478662B CN111478662B CN202010354613.0A CN202010354613A CN111478662B CN 111478662 B CN111478662 B CN 111478662B CN 202010354613 A CN202010354613 A CN 202010354613A CN 111478662 B CN111478662 B CN 111478662B
- Authority
- CN
- China
- Prior art keywords
- capacitor
- electrode
- current
- detection device
- negative
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000007599 discharging Methods 0.000 title claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims abstract description 48
- 238000001514 detection method Methods 0.000 claims abstract description 37
- 230000005611 electricity Effects 0.000 claims abstract description 6
- 238000011084 recovery Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention discloses a discharging method and a circuit of a solar power station pressurizing device, wherein the circuit comprises the following steps: the solar cell, the inverter, the pressurizing device and two direct current access ends of the inverter are respectively in conductive connection with a positive output electrode and a negative output electrode of the solar cell, the positive output electrode and the negative output electrode of the solar cell are also respectively in conductive connection with one electrode of a first capacitor and a second capacitor, and the other electrode of the first capacitor and the second capacitor is grounded; the pressurizing device includes: the device comprises a power supply, a current detection device, a current resistor, a relay and a voltage detection device; the positive pole incoming end, the negative pole incoming end of voltage detection device are connected with solar cell's positive pole output, negative pole output electricity respectively, the break-make of relay control circuit, current-limiting resistance are connected with the negative pole incoming end electricity of current detection device, and the positive pole incoming end of current detection device is connected with the positive pole electricity of power, and the negative pole ground connection of power.
Description
Technical Field
The invention relates to the field of photovoltaic power generation, in particular to a discharging method of a solar power station pressurizing device.
Background
When the solar power station generates PID attenuation (potential energy induced attenuation phenomenon), the recovery and prevention of the PID attenuation can be realized by applying voltage (positive voltage or negative voltage) between the interior of the component and the ground. The following description will be made by taking the application of a positive voltage as an example. The positive and negative electrodes of the pressure device are respectively connected between the negative electrode (or positive electrode) of the inverter and the ground, and the pressure device applies voltage between the negative electrode (or positive electrode) and the ground at night to recover and prevent the PID phenomenon.
The solar cell is required to be converted into alternating current or direct current by a power conversion device for use. In consideration of safety regulations, a capacitor is arranged between the positive and negative electrodes of the direct current end of the power conversion device and the ground. In the daytime, the solar cell is under the irradiation of the sun, the polar plate of the capacitor between the positive electrode and the ground, which is close to the positive electrode, is positively charged, the polar plate close to the ground is negatively charged, the polar plate of the capacitor between the negative electrode and the ground, which is close to the negative electrode, is negatively charged, and the polar plate close to the ground is positively charged.
When the voltage of the solar cell is very low, the pressurizing device is started to perform PID recovery. The voltage is also applied to the capacitance between the negative pole inside the power conversion device and ground. The pressurization device and the reverse charges carried by the capacitor are superposed, so that a larger instantaneous current can be generated, a current detection device in the pressurization device is damaged, and the normal operation of the pressurization device is influenced.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a discharging method and circuit in a solar power station pressurizing device, which can avoid the damage of a current detection device due to an excessive current.
In order to achieve the above object, the present invention provides a discharging method of a solar power station pressurizing device, comprising:
a solar cell for generating electricity by solar energy;
the inverter is used for inverting the direct current generated by the solar battery into alternating current which can be merged into a power grid;
a pressurizing device for applying a voltage between the solar cell and the ground;
two direct current access ends of the inverter are respectively in conductive connection with a positive electrode output electrode and a negative electrode output electrode of the solar battery, the positive electrode output electrode and the negative electrode output electrode of the solar battery are also respectively in conductive connection with one electrode of a first capacitor and a second capacitor, and the other electrode of the first capacitor and the second capacitor is grounded;
the pressurizing device includes:
a power supply for outputting a pressurized direct current;
a current detection device for detecting a current of the loop;
the current resistor is used for limiting the current of the loop;
the relay is used for controlling the on-off of the loop;
a voltage detection device for detecting a voltage output from the solar cell; the positive electrode access end and the negative electrode access end of the voltage detection device are respectively electrically connected with the positive electrode output end and the negative electrode output end of the solar battery, the movable contact of the relay is electrically connected with the negative electrode output end of the solar battery, the stationary contact of the relay is electrically connected with one end of the current-limiting resistor, the other end of the current-limiting resistor is electrically connected with the negative electrode access end of the current detection device, the positive electrode access end of the current detection device is electrically connected with the positive electrode of the power supply, and the negative electrode of the power supply is grounded.
As a preferred technical solution of the present invention, the positive output electrode and the negative output electrode of the solar cell are electrically connected to the positive terminal of the first capacitor and the negative terminal of the second capacitor, respectively, and the negative terminal of the first capacitor and the positive terminal of the second capacitor are grounded, respectively.
As a preferred technical solution of the present invention, the negative electrode of the power supply is electrically connected to the negative electrode terminal of the first capacitor and the positive electrode terminal of the second capacitor, respectively, and then grounded.
As the preferred technical scheme of the invention, the signal end of the voltage detection device is connected to the controller; the signal end of the current detection device is connected with the controller, and the control end of the relay is electrically connected with the signal end of the controller.
The invention also discloses a discharging method of the solar power station pressurizing device, which is applied with the circuit.
As a preferred technical scheme of the invention, the discharge process is as follows:
when the voltage of the solar cell obtained by the test of the voltage detection device is lower than a preset threshold value, closing the relay; the charge of the capacitor in the inverter is released through the circuit; when the release is completed, the power supply is turned on to apply voltage between the solar cell and the ground.
The invention has the beneficial effects that:
the invention sets current-limiting resistance, relay and other devices in the circuit of the pressurizing device, can release the voltage of the capacitor between the cathode in the pressurizing device and the ground by closing the relay, and in addition, the current in the whole process is not too large due to the effect of the current-limiting resistance in the circuit, and the current detection device cannot be damaged. And after the voltage of the capacitor between the cathode and the ground is released, starting the pressurizing device to recover and prevent the PID phenomenon.
Drawings
Fig. 1 is a schematic diagram of the circuit configuration of the present invention.
In fig. 1, 1 is a solar cell, 2 is an inverter, 2-1 is a first capacitor, 2-2 is a second capacitor, 3 is a pressurizing device, 3-1 is a power supply, 3-2 is a current detection device, 3-3 is a current limiting resistor, 3-4 is a relay, and 3-5 is a voltage detection device.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Referring to fig. 1, the circuit of the present embodiment includes:
a solar cell 1 for generating electricity by solar energy;
an inverter 2 for inverting the direct current generated from the solar cell 1 into an alternating current that can be incorporated into a power grid;
a pressurizing device 3 for applying a voltage between the solar cell and the ground;
two direct current access ends of the inverter 2 are respectively in conductive connection with a positive electrode output electrode and a negative electrode output electrode of the solar cell 1, the positive electrode output electrode and the negative electrode output electrode of the solar cell 1 are also respectively in conductive connection with one electrode of the first capacitor 2-1 and the second capacitor 2-2, and the other electrode of the first capacitor 2-1 and the second capacitor 2-2 is grounded. In this embodiment, a positive output electrode and a negative output electrode of the solar cell 1 are respectively electrically connected to a positive terminal of the first capacitor 2-1 and a negative terminal of the second capacitor 2-2, and the negative terminal of the first capacitor 2-1 and the positive terminal of the second capacitor 2-2 are respectively grounded;
the pressurizing device 3 includes:
a power supply 3-1 for outputting a pressurized direct current;
a current detection device 3-2 for detecting a current of the loop; the current meter can be selected in the embodiment;
and the current resistor 3-3 is used for limiting the current of the loop to prevent the elements connected in series from being burnt out due to overlarge current.
The relay 3-4 is used for controlling the on-off of the loop;
a voltage detection device 3-5 for detecting a voltage output from the solar cell 1; a voltmeter may be selected for this implementation.
The positive electrode access end and the negative electrode access end of the voltage detection device 3-5 are respectively electrically connected with the positive electrode output end and the negative electrode output end of the solar battery 1, the signal end of the voltage detection device is connected with the controller, the movable contact of the relay 3-4 is electrically connected with the negative electrode output end of the solar battery 1, the stationary contact is electrically connected with one end of the current limiting resistor 3-3, the other end of the current limiting resistor 3-3 is electrically connected with the negative electrode access end of the current detection device 3-2, the positive electrode access end of the current detection device 3-2 is electrically connected with the positive electrode of the power supply 3-1, and the negative electrode of the power supply 3-1 is grounded. In addition, in the embodiment, the negative electrode of the power supply 3-1 is electrically connected with the negative electrode end of the first capacitor 2-1 and the positive electrode end of the second capacitor 2-2 respectively and then grounded. The signal end of the current detection device 3-2 is connected to the controller.
The controller of this embodiment is used for receiving and dispatching analysis control command to parameter calculation, program operation, can select for use PLC, MCU, CPU, industrial computer etc.. The power supply of this embodiment is for outputting direct current and may be an AC-DC converter.
The circuit of this embodiment operates as follows:
1) the electric power of the solar cell 1 is converted by the inverter 2 and then input to the grid.
2) And in consideration of safety regulations, capacitors are respectively arranged between the positive electrode and the negative electrode of the direct current end of the inverter and the ground. The first capacitor 2-1 has a positive charge on the plate near the positive pole and a negative charge on the plate near the ground when the solar cell is under voltage. The second capacitor 2-2 has a positive charge on the plate near the earth and a negative charge on the plate near the negative electrode when the solar cell has a voltage.
3) The solar pressurizing device 3 mainly comprises a power supply 3-1, a current detection device 3-2, a current limiting resistor 3-3, a relay 3-4 and a voltage detection device 3-5.
4) When the voltage of the solar battery obtained by the voltage detection device 3-5 is lower than a certain value (set according to the existing PID recovery access standard), the relay 3-4 is closed, the electric charge of the capacitor 2-2 in the inverter is released through the circuit, and the current cannot be suddenly increased due to the existence of the current limiting resistor 3-3, so that the current detection device 3-2 can be prevented from being damaged. And after the release is finished, the power supply 3-1 is started to apply voltage between the solar cell and the ground, and PID recovery and prevention are carried out.
The invention is not described in detail, but is well known to those skilled in the art.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (4)
1. A discharge method of a solar power station pressurization device is characterized in that a circuit comprises the following steps:
a solar cell for generating electricity by solar energy;
the inverter is used for inverting the direct current generated by the solar battery into alternating current which can be merged into a power grid;
a pressurizing device for applying a voltage between the solar cell and the ground;
two direct current access ends of the inverter are respectively in conductive connection with a positive electrode output electrode and a negative electrode output electrode of the solar battery, the positive electrode output electrode and the negative electrode output electrode of the solar battery are also respectively in conductive connection with one electrode of a first capacitor and a second capacitor, and the other electrode of the first capacitor and the second capacitor is grounded;
the pressurizing device includes:
a power supply for outputting a pressurized direct current;
a current detection device for detecting a current of the loop;
the current resistor is used for limiting the current of the loop;
the relay is used for controlling the on-off of the loop;
a voltage detection device for detecting a voltage output from the solar cell; the positive electrode access end and the negative electrode access end of the voltage detection device are respectively electrically connected with the positive electrode output end and the negative electrode output end of the solar battery, the movable contact of the relay is electrically connected with the negative electrode output end of the solar battery, the stationary contact of the relay is electrically connected with one end of the current-limiting resistor, the other end of the current-limiting resistor is electrically connected with the negative electrode access end of the current detection device, the positive electrode access end of the current detection device is electrically connected with the positive electrode of the power supply, and the negative electrode of the power supply is grounded;
the discharge process is as follows:
when the voltage of the solar cell obtained by the test of the voltage detection device is lower than a preset threshold value, closing the relay; the charge of the capacitor in the inverter is released through the circuit; when the release is completed, the power supply is turned on to apply voltage between the solar cell and the ground.
2. The discharging method according to claim 1, wherein the positive output electrode and the negative output electrode of the solar cell are electrically connected to the positive terminal of the first capacitor and the negative terminal of the second capacitor, respectively, and the negative terminal of the first capacitor and the positive terminal of the second capacitor are grounded, respectively.
3. The discharging method according to claim 2, wherein the negative terminal of the power supply is electrically connected to the negative terminal of the first capacitor and the positive terminal of the second capacitor, respectively, and then grounded.
4. The discharge method of claim 1, wherein a signal terminal of the voltage detection device is connected to the controller; the signal end of the current detection device is connected with the controller, and the control end of the relay is electrically connected with the signal end of the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010354613.0A CN111478662B (en) | 2020-04-29 | 2020-04-29 | Discharging method of solar power station pressurizing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010354613.0A CN111478662B (en) | 2020-04-29 | 2020-04-29 | Discharging method of solar power station pressurizing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111478662A CN111478662A (en) | 2020-07-31 |
| CN111478662B true CN111478662B (en) | 2022-04-15 |
Family
ID=71762939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010354613.0A Active CN111478662B (en) | 2020-04-29 | 2020-04-29 | Discharging method of solar power station pressurizing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111478662B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346687A (en) * | 2013-06-20 | 2013-10-09 | 东华大学 | Single-phase non-isolated photovoltaic grid-connected inverter topological structure and control method thereof |
| CN105720907A (en) * | 2016-01-25 | 2016-06-29 | 南京科远自动化集团股份有限公司 | Method and device for inhibiting PID effect of photovoltaic module in inverter |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2230522B1 (en) * | 2009-03-16 | 2011-05-11 | SMA Solar Technology AG | Method and device for insulation monitoring of a network without a neutral conductor |
| US9362846B2 (en) * | 2014-02-25 | 2016-06-07 | Futurewei Technologies, Inc. | Soft switching inverter with auxiliary switch facilitating zero voltage switching |
| CN107888100B (en) * | 2016-09-30 | 2019-12-20 | 维谛技术有限公司 | Inverter, method for controlling inverter and control device |
| CN107230997A (en) * | 2017-05-11 | 2017-10-03 | 华为技术有限公司 | A kind of photovoltaic generating system |
| CN107196597B (en) * | 2017-05-16 | 2019-12-13 | 华为技术有限公司 | photovoltaic power generation system |
| CN108011583B (en) * | 2017-12-27 | 2020-01-21 | 阳光电源股份有限公司 | Device for inhibiting PID effect |
-
2020
- 2020-04-29 CN CN202010354613.0A patent/CN111478662B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346687A (en) * | 2013-06-20 | 2013-10-09 | 东华大学 | Single-phase non-isolated photovoltaic grid-connected inverter topological structure and control method thereof |
| CN105720907A (en) * | 2016-01-25 | 2016-06-29 | 南京科远自动化集团股份有限公司 | Method and device for inhibiting PID effect of photovoltaic module in inverter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111478662A (en) | 2020-07-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207164146U (en) | A kind of insulating resistor detecting circuit of power battery of pure electric automobile | |
| CN103199579B (en) | Battery unit element cell equalizing charge controller | |
| CN102118067B (en) | Non-contact high-voltage power obtaining method | |
| CN201328023Y (en) | Back-up power for electric pitch system of wind turbine | |
| CN103278776B (en) | A kind of batteries of electric automobile Insulation Inspection System | |
| CN103066671A (en) | Uniform charging method and uniform charging device for lithium battery packs | |
| CN106771947A (en) | A kind of detection circuit and its detection method for IGBT surge currents | |
| CN105720907B (en) | A kind of method and device for being used in inverter suppress photovoltaic module PID effects | |
| CN104467077A (en) | Storage battery charging control method | |
| Li et al. | Operating characteristic analysis of multi-terminal hybrid HVDC transmission system with different control strategies | |
| CN103944501A (en) | PID recovery system for solar power station | |
| CN207968420U (en) | A kind of optimizer and photovoltaic generating system | |
| CN111478662B (en) | Discharging method of solar power station pressurizing device | |
| CN102468659A (en) | Charging control system and method thereof | |
| CN201251608Y (en) | Lightning arrester action counter detector | |
| CN204068408U (en) | Be applied to the novel power taking supply unit of cable work well array water | |
| CN202524069U (en) | Reverse-polarity protection circuit | |
| CN111555710A (en) | PLC (programmable logic controller) driving circuit of photovoltaic shutoff device and control method thereof | |
| CN204597597U (en) | A kind of domestic solar electric power system | |
| CN203289169U (en) | Pre-charging device of power unit cascaded high-voltage inverter | |
| CN111092471A (en) | Use method of overcharge and overdischarge protection circuit for energy storage battery pack | |
| CN203037813U (en) | Open circuit voltage wave generator | |
| CN202150792U (en) | Power supply time-delay module | |
| CN110854914B (en) | Method for isolating solar power station from power grid | |
| CN207835086U (en) | Mobile power |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |