CN107069686A - Grid-connected moment impact current suppressing circuit and apply its photovoltaic inversion system - Google Patents
Grid-connected moment impact current suppressing circuit and apply its photovoltaic inversion system Download PDFInfo
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- CN107069686A CN107069686A CN201710180377.3A CN201710180377A CN107069686A CN 107069686 A CN107069686 A CN 107069686A CN 201710180377 A CN201710180377 A CN 201710180377A CN 107069686 A CN107069686 A CN 107069686A
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- Prior art keywords
- relay
- grid
- current
- branch road
- suppressing circuit
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- 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
- H02H9/021—Current limitation using saturable reactors
Abstract
The present invention relates to a kind of grid-connected moment impact current suppressing circuit, two group relays set between the AC ends of combining inverter and power network are connected, grid-connected moment impact current suppressing circuit suppresses branch road including being parallel to the dash current at any one group relay two ends, and dash current suppression branch road is included in after the group relay closure of not connected dash current suppression branch road, is connected with the electric current suppression relay closed before the group relay closure of dash current suppression branch road and the resistance being in series with electric current suppression relay.The grid-connected moment impact current suppressing circuit of the present invention can avoid producing larger leakage current impact in photovoltaic inversion system, so that the protective effect to playing photovoltaic inversion system by the switch for the closing time that staggers and the setting of series resistance.
Description
Technical field
It is applied to be used for suppress the dash current of grid-connected moment in photovoltaic parallel in system the present invention relates to a kind of
Circuit.
Background technology
Non-isolated combining inverter in photovoltaic parallel in system, because directly being connected with power network, safety standard requires to need
Two group relays be set between power network at it, be controlled respectively by major-minor CPU, so as to realize redundancy protecting.With it is single-phase it is non-every
Exemplified by photovoltaic combining inverter, its specific topology is as shown in Figure 1.In the wink of simultaneously network relay Relay_M, Relay_S adhesive
Between have an AC ends that larger impact leakage current flows through combining inverter, the path for impacting leakage current is as shown in Figure 2.This electric leakage
The value size and inverter of stream Y capacitance over the ground, and in itself relevant with the PV panel parasitic capacitance Cy sizes that inverter is connected.Leakage
If electric current is too big, the RCD detection switch action at grid-connected end is easily caused, causes tripping operation.
The content of the invention
The leakage current of the grid-connected moment generation of relay can be suppressed it is an object of the invention to provide a kind of, so as to avoid electric leakage
Conductance causes the grid-connected moment impact current suppressing circuit of tripping operation.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of grid-connected moment impact current suppressing circuit, two group relays set between the AC ends of combining inverter and power network
It is connected, the grid-connected moment impact current suppressing circuit includes the dash current for being parallel to relay two ends described in any one group
Suppress branch road, the dash current suppresses branch road and is included in the group relay closure that the not connected dash current suppresses branch road
Afterwards, be connected with the dash current suppress the electric current suppression relay that is closed before the group relay closure of branch road and with
The electric current suppresses the resistance that relay is in series.
The AC ends of the combining inverter include positive output end and negative output terminal, and relay described in every group includes being arranged at
Part I and the Part II being arranged on the negative output terminal on the positive output end；It is connected with the dash current suppression
In relay described in one group of branch road processed, the Part I and the Part II are respectively connected with the dash current and suppress branch
Road.
The combining inverter is single-phase inverter or three-phase inverter.
The present invention also provides a kind of photovoltaic inversion system, and it includes photovoltaic panel PV, DC/DC converter, DC/AC simultaneously
Net inverter, two group relays, residual current protection switch RCD, power network, the photovoltaic inversion system also include it is foregoing and
Net moment impact current suppressing circuit.
Because above-mentioned technical proposal is used, the present invention has following advantages compared with prior art：The grid-connected wink of the present invention
Between dash current suppression circuit by the switch for the closing time that staggers and the setting of series resistance, photovoltaic inversion can be avoided
Larger leakage current impact is produced in system, so that the protective effect to playing photovoltaic inversion system.
Brief description of the drawings
Accompanying drawing 1 is the topological diagram of existing single-phase non-isolated grid-connected inverter.
Accompanying drawing 2 is the impact electric leakage flow diagram of existing single-phase non-isolated grid-connected inverter.
Accompanying drawing 3 is showing for the single-phase photovoltaic inversion system of the grid-connected moment impact current suppressing circuit of the application present invention
It is intended to.
Accompanying drawing 4 is grid-connected moment impact current suppressing circuit control flow chart of the invention.
Accompanying drawing 5 is showing for the three-phase photovoltaic inversion system of the grid-connected moment impact current suppressing circuit of the application present invention
It is intended to.
Accompanying drawing 6 is showing for the single-phase photovoltaic inversion system of the grid-connected moment impact current suppressing circuit of the application present invention
It is intended to.
Embodiment
The invention will be further described for shown embodiment below in conjunction with the accompanying drawings.
Embodiment one：As shown in Figure 3, photovoltaic panel PV, DC/DC that photovoltaic inversion system includes setting gradually become
Parallel operation, DC/AC combining inverters, two group relays, residual current protection switch RCD, power network.Wherein, two group relays are according to peace
Rule require, be in series and be arranged on the AC ends of combining inverter and residual current protection switch RCD/ power networks between, and respectively by master,
Secondary CPU is controlled, to meet the requirement of Redundant Control.
It is a kind of be applied to above-mentioned photovoltaic inversion system in grid-connected moment impact current suppressing circuit, it with two groups after
Electrical equipment is connected.Specifically, the grid-connected moment impact current suppressing circuit includes being parallel to rushing for any one group relay two ends
Hit electric current and suppress branch road, in the present embodiment, dash current suppresses branch circuit parallel connection in relay Relay_M two ends.Dash current
Suppressing branch road includes an electric current suppression relay K1/K2 and resistance R1/R2, and electric current suppresses relay K1/K2 and resistance R1/R2
It is in series.So cause in two group relays, a group relay Relay_M is connected with dash current and suppresses branch road, and another group
Relay Relay_S is not connected with dash current and suppresses branch road.
Generally, the AC ends of combining inverter include positive output end and negative output terminal, and include being arranged at per group relay
Part I and the Part II being arranged on negative output terminal on positive output end.It is connected with one group that dash current suppresses branch road
In relay, its Part I and Part II are respectively connected with dash current and suppress branch road.
Above-mentioned dash current suppresses branch circuit parallel connection in the two ends of relay, the problem of solving impact leakage current.Impact electricity
The electric current that stream suppresses in branch road, which suppresses relay K1/K2, to be needed to suppress the group relay closure of branch road in not connected dash current
Afterwards, it is connected with before dash current suppresses the group relay closure of branch road and is closed.As shown in Figure 4, to solve two groups after
Electrical equipment Relay_M, Relay_S close the impact leakage current of moment, can allow two group relay Relay_M, Relay_S closure
Time staggers.The group relay Relay_S that not connected dash current suppresses branch road is first closed, now relay Relay_M is
Off-state, whole loop is to disconnect, therefore does not have impact leakage current now.It is closed again relay Relay_M two ends simultaneously
The electric current that the dash current of connection suppresses on branch road suppresses relay K1, K2, though the now loop between combining inverter and power network
So connect, but because resistance R1/R2 presence, the size of impact leakage current is suppressed in a less value.Finally it is closed again
Relay Relay_M, because now loop has turned on, will not cause big impact after relay Relay_M closures,
The problem of solving grid-connected impact leakage current well.
Stated above and in accompanying drawing 3 by taking single-phase grid-connected inverter as an example, but in practical application, above-mentioned grid-connected moment punching
Hit current suppressing circuit be not limited to it is single-phase, three-phase grid-connected inverter also can apply this programme, as shown in Figure 5.
In such scheme, electric current suppresses the dash current suppression branch circuit parallel connection that relay K1/K2 and resistance R1/R2 is constituted
At main relay Relay_M two ends, it can also be connected in parallel on secondary relay Relay_S two ends, as shown in Figure 6.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, should all be included within the scope of the present invention.
Claims (4)
1. a kind of grid-connected moment impact current suppressing circuit, the two groups of relays set between the AC ends of combining inverter and power network
Device is connected, it is characterised in that：The grid-connected moment impact current suppressing circuit includes being parallel to relay described in any one group
The dash current at two ends suppresses branch road, and the dash current suppresses branch road and is included in the not connected dash current suppression branch road
After one group relay closure, it is connected with the electric current suppression that the dash current suppresses to be closed before the group relay closure of branch road
Relay processed and the resistance being in series with electric current suppression relay.
2. grid-connected moment impact current suppressing circuit according to claim 1, it is characterised in that：The combining inverter
AC ends include positive output end and negative output terminal, and relay described in every group includes the Part I being arranged on the positive output end
With the Part II being arranged on the negative output terminal；It is connected with the dash current and suppresses relay described in one group of branch road
In, the Part I and the Part II are respectively connected with the dash current and suppress branch road.
3. grid-connected moment impact current suppressing circuit according to claim 1, it is characterised in that：The combining inverter is
Single-phase inverter or three-phase inverter.
4. a kind of photovoltaic inversion system, including photovoltaic panel PV, DC/DC converter, DC/AC combining inverters, two groups after
Electrical equipment, residual current protection switch RCD, power network, it is characterised in that：The photovoltaic inversion system also includes such as claim 1-
Grid-connected moment impact current suppressing circuit any one of 3.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710180377.3A CN107069686A (en) | 2017-03-24 | 2017-03-24 | Grid-connected moment impact current suppressing circuit and apply its photovoltaic inversion system |
| PCT/CN2018/080389 WO2018171785A1 (en) | 2017-03-24 | 2018-03-24 | Grid-connected instantaneous current surge suppression circuit and photovoltaic power generation inverter system applying same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710180377.3A CN107069686A (en) | 2017-03-24 | 2017-03-24 | Grid-connected moment impact current suppressing circuit and apply its photovoltaic inversion system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107069686A true CN107069686A (en) | 2017-08-18 |
Family
ID=59621158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710180377.3A Pending CN107069686A (en) | 2017-03-24 | 2017-03-24 | Grid-connected moment impact current suppressing circuit and apply its photovoltaic inversion system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107069686A (en) |
| WO (1) | WO2018171785A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018171785A1 (en) * | 2017-03-24 | 2018-09-27 | 江苏固德威电源科技股份有限公司 | Grid-connected instantaneous current surge suppression circuit and photovoltaic power generation inverter system applying same |
| US11791719B2 (en) | 2019-01-28 | 2023-10-17 | Huawei Digital Power Technologies Co., Ltd. | Device, method, and system for resolving common-mode voltage interference |
| CN117277242A (en) * | 2023-11-21 | 2023-12-22 | 锦浪科技股份有限公司 | Leakage current suppression method for photovoltaic system |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109103979B (en) * | 2018-10-24 | 2023-11-10 | 珠海格力电器股份有限公司 | Photovoltaic electric equipment, charging control method and device thereof, circuit and storage medium |
| CN113078806B (en) * | 2021-05-11 | 2022-06-14 | 江苏固德威电源科技股份有限公司 | Method and device for inhibiting pull-in impact current of inverter output relay |
| CN114551156B (en) * | 2022-02-28 | 2023-08-29 | 西安思丹德信息技术有限公司 | Relay contact protection circuit for controlling capacitive load |
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| CN107069686A (en) * | 2017-03-24 | 2017-08-18 | 江苏固德威电源科技股份有限公司 | Grid-connected moment impact current suppressing circuit and apply its photovoltaic inversion system |
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- 2017-03-24 CN CN201710180377.3A patent/CN107069686A/en active Pending
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2018
- 2018-03-24 WO PCT/CN2018/080389 patent/WO2018171785A1/en active Application Filing
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| CN201490725U (en) * | 2009-09-01 | 2010-05-26 | 合肥阳光电源有限公司 | Buffer grid-connected circuit for transformer of photovoltaic grid-connected inverter |
| CN102983765A (en) * | 2011-09-07 | 2013-03-20 | 艾伏新能源科技(上海)股份有限公司 | Efficient no-transformer single phase photovoltaic grid-connected inverter |
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| US11791719B2 (en) | 2019-01-28 | 2023-10-17 | Huawei Digital Power Technologies Co., Ltd. | Device, method, and system for resolving common-mode voltage interference |
| CN117277242A (en) * | 2023-11-21 | 2023-12-22 | 锦浪科技股份有限公司 | Leakage current suppression method for photovoltaic system |
| CN117277242B (en) * | 2023-11-21 | 2024-02-20 | 锦浪科技股份有限公司 | Leakage current suppression method for photovoltaic system |
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| Publication number | Publication date |
|---|---|
| WO2018171785A1 (en) | 2018-09-27 |
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Application publication date: 20170818 |