CN109946560A - The current transformer polarity adaptive approach of photovoltaic DC-to-AC converter - Google Patents
The current transformer polarity adaptive approach of photovoltaic DC-to-AC converter Download PDFInfo
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- CN109946560A CN109946560A CN201910193410.5A CN201910193410A CN109946560A CN 109946560 A CN109946560 A CN 109946560A CN 201910193410 A CN201910193410 A CN 201910193410A CN 109946560 A CN109946560 A CN 109946560A
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- current transformer
- photovoltaic
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Abstract
The present invention provides a kind of current transformer polarity adaptive approach of photovoltaic DC-to-AC converter, comprising the following steps: S1, predetermined current mutual inductor direction；The information of S2, the electric current of storage current transformer acquisition and network voltage；S3, photovoltaic inverter grid-connected and output power；The information of S4, the electric current of storage current transformer acquisition and network voltage；The information of the electric current and network voltage of S5, comparison step S2 and step S4 storage, obtains current transformer polarity；S6, storage current transformer polarity.The beneficial effects of the present invention are: it is easy to operate, the adaptability of current transformer is increased, workload is reduced, efficiently solves the problems, such as that current transformer installation is complicated.
Description
Technical field
The present invention relates to current transformer polarity adaptive approach more particularly to a kind of current transformers of photovoltaic DC-to-AC converter
Polarity adaptive approach.
Background technique
Since polarity of the photovoltaic DC-to-AC converter counterflow-preventing function to current transformer has specific configuration requirement, it is therefore desirable to raw
It produces test and site operation personnel must be according to specific mode of connection wiring, complex for operation step and wasting manpower and material resources, no
Test easy to produce and site operation.And actual production test and site operation proficiency are irregular, if current transformer
Polarity wrong will lead to photovoltaic DC-to-AC converter malfunction or even can not normal output power.
Therefore, existing photovoltaic DC-to-AC converter current transformer how to be overcome to operate in production test and field-mounted process
Complicated defect is those skilled in the art's technical problem urgently to be resolved.
Summary of the invention
In order to solve the problems in the prior art, the present invention provides a kind of current transformer polarity of photovoltaic DC-to-AC converter certainly
Adaptive method.
The present invention provides a kind of current transformer polarity adaptive approach of photovoltaic DC-to-AC converter, comprising the following steps:
S1, predetermined current mutual inductor direction；
The information of S2, the electric current of storage current transformer acquisition and network voltage；
S3, photovoltaic inverter grid-connected and output power；
The information of S4, the electric current of storage current transformer acquisition and network voltage；
The information of the electric current and network voltage of S5, comparison step S2 and step S4 storage, obtains current transformer polarity；
S6, storage current transformer polarity.
As a further improvement of the present invention, between step S1, S2, whether increase step S10, detection photovoltaic DC-to-AC converter
Meet grid-connected conditions, if conditions are not met, then terminating, if it is satisfied, then entering step S2.
As a further improvement of the present invention, in step slo, photovoltaic cell panel output voltage, network voltage, electricity are detected
Whether net frequency, insulation impedance and leakage current meet grid-connected conditions, if conditions are not met, then terminating, if it is satisfied, then entering step
S2。
As a further improvement of the present invention, the electric current of the current transformer acquisition and the information of network voltage include width
One of value, real value, periodic quantity, average value, virtual value and phase or several combinations.
As a further improvement of the present invention, the photovoltaic DC-to-AC converter output power is active, advanced idle and lag nothing
One of function or several combinations.
As a further improvement of the present invention, in step s 5, if before photovoltaic DC-to-AC converter active power of output, using pre-
If the active power that current transformer current direction calculates is power grid flow direction load, if photovoltaic DC-to-AC converter active power of output
Afterwards, it flows to bearing power using the power grid of predetermined current transformer current direction calculating to reduce, then current transformer direction and pre-
Set direction is identical；If before photovoltaic DC-to-AC converter active power of output, utilizing the active of predetermined current transformer current direction calculating
Power is negative current-carrying to power grid, if after photovoltaic DC-to-AC converter active power of output, utilizing predetermined current transformer current telegoniometer
The load of calculation flows to grid power reduction, then current transformer direction is opposite with preset direction.
The beneficial effects of the present invention are: through the above scheme, it is easy to operate, the adaptability of current transformer is increased, is subtracted
Few workload efficiently solves the problems, such as that current transformer installation is complicated.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the current transformer polarity adaptive approach of photovoltaic DC-to-AC converter of the present invention.
Fig. 2 is photovoltaic DC-to-AC converter and operation of current transformers scene composition figure.
Specific embodiment
The invention will be further described for explanation and specific embodiment with reference to the accompanying drawing.
It includes: photovoltaic battery panel 6, photovoltaic DC-to-AC converter 1, load that photovoltaic DC-to-AC converter 1 and current transformer 2, which install required device,
5, connection unit 4, public electric wire net 3, current transformer 2 and electric wire are exchanged, connection installation as shown in Fig. 2, photovoltaic battery panel 6,
Load 5 is connect with photovoltaic DC-to-AC converter 1 respectively, and photovoltaic DC-to-AC converter 1 is connect by exchanging connection unit 4 with public electric wire net 3, and photovoltaic is inverse
Become device 1 to connect by current transformer 2 with the firewire of public electric wire net 3.
As shown in Figure 1, a kind of current transformer polarity adaptive approach of photovoltaic DC-to-AC converter provided by the invention, including with
Lower step:
1,2 direction of predetermined current mutual inductor；
2, the photovoltaic DC-to-AC converters 1 such as 6 output voltage of photovoltaic battery panel, network voltage, mains frequency, insulation impedance and leakage current are detected
The grid-connected condition for needing to meet；
3, storage current transformer 2 acquires the phase information of electric current and network voltage；
4, photovoltaic DC-to-AC converter 1 is grid-connected and active power of output；
5, storage current transformer 2 acquires the phase information of electric current and network voltage；
If 6, before 1 active power of output of photovoltaic DC-to-AC converter, utilizing the active power of 2 current direction of predetermined current mutual inductor calculating
It flows to and loads for power grid, if after 1 active power of output of photovoltaic DC-to-AC converter, calculated using 2 current direction of predetermined current mutual inductor
Power grid flow to bearing power reduction, then 2 direction of current transformer is identical as preset direction.
If before 1 active power of output of photovoltaic DC-to-AC converter, utilizing the wattful power of 2 current direction of predetermined current mutual inductor calculating
Rate is negative current-carrying to power grid, if after 1 active power of output of photovoltaic DC-to-AC converter, utilizing 2 current direction meter of predetermined current mutual inductor
The load of calculation flows to grid power reduction, then 2 direction of current transformer is opposite with preset direction.
7, obtained 2 polarity of current transformer of previous step is stored in storage unit.
The current transformer polarity adaptive approach of a kind of photovoltaic DC-to-AC converter provided by the invention, by changing photovoltaic inversion
The output power of device 1, comparison change the information of front and back current transformer 2 electric current and network voltage, multilevel iudge current transformer 2
Polarity.
A kind of current transformer polarity adaptive approach of photovoltaic DC-to-AC converter provided by the invention, simplifies photovoltaic DC-to-AC converter
1, the installation steps of current transformer 2, solve the problems, such as current transformer 2 because polarity it is anti-loaded caused by, overcome existing photovoltaic
Inverter current mutual inductor defect complicated for operation in production test and field-mounted process.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (6)
1. a kind of current transformer polarity adaptive approach of photovoltaic DC-to-AC converter, which comprises the following steps:
S1, predetermined current mutual inductor direction；
The information of S2, the electric current of storage current transformer acquisition and network voltage；
S3, photovoltaic inverter grid-connected and output power；
The information of S4, the electric current of storage current transformer acquisition and network voltage；
The information of the electric current and network voltage of S5, comparison step S2 and step S4 storage, obtains current transformer polarity；
S6, storage current transformer polarity.
2. the current transformer polarity adaptive approach of photovoltaic DC-to-AC converter according to claim 1, it is characterised in that: in step
Suddenly between S1, S2, increase step S10, detect whether photovoltaic DC-to-AC converter meets grid-connected conditions, if conditions are not met, then terminate, if
Meet, then enters step S2.
3. the current transformer polarity adaptive approach of photovoltaic DC-to-AC converter according to claim 2, it is characterised in that: in step
In rapid S10, it is grid-connected whether detection photovoltaic cell panel output voltage, network voltage, mains frequency, insulation impedance and leakage current meet
Condition, if conditions are not met, then terminating, if it is satisfied, then entering step S2.
4. the current transformer polarity adaptive approach of photovoltaic DC-to-AC converter according to claim 1, it is characterised in that: described
The electric current of current transformer acquisition and the information of network voltage include amplitude, real value, periodic quantity, average value, virtual value and phase
One of position or several combinations.
5. the current transformer polarity adaptive approach of photovoltaic DC-to-AC converter according to claim 1, it is characterised in that: described
Photovoltaic DC-to-AC converter output power is active, advanced idle and lags one of idle or several combinations.
6. the current transformer polarity adaptive approach of photovoltaic DC-to-AC converter according to claim 1, it is characterised in that: in step
In rapid S5, if before photovoltaic DC-to-AC converter active power of output, utilizing the active power of predetermined current transformer current direction calculating
It flows to and loads for power grid, if after photovoltaic DC-to-AC converter active power of output, utilizing predetermined current transformer current direction calculating
Power grid flows to bearing power reduction, then current transformer direction is identical as preset direction；If photovoltaic DC-to-AC converter exports wattful power
Before rate, current-carrying is negative to power grid, if photovoltaic DC-to-AC converter is defeated using the active power of predetermined current transformer current direction calculating
Out after active power, grid power is flowed to using the load of predetermined current transformer current direction calculating and is reduced, then Current Mutual Inductance
Device direction is opposite with preset direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910193410.5A CN109946560B (en) | 2019-03-14 | 2019-03-14 | Current transformer polarity self-adaption method of photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910193410.5A CN109946560B (en) | 2019-03-14 | 2019-03-14 | Current transformer polarity self-adaption method of photovoltaic inverter |
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| CN109946560A true CN109946560A (en) | 2019-06-28 |
| CN109946560B CN109946560B (en) | 2021-04-30 |
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| CN201910193410.5A Active CN109946560B (en) | 2019-03-14 | 2019-03-14 | Current transformer polarity self-adaption method of photovoltaic inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112180313A (en) * | 2020-09-02 | 2021-01-05 | 深圳市首航新能源股份有限公司 | Automatic correction method and control device for current transformer and energy storage equipment |
| CN113078676A (en) * | 2021-04-02 | 2021-07-06 | 新风光电子科技股份有限公司 | Control method of current sensor direction and current loop decoupling direction interlocking mechanism |
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| JP2000232779A (en) * | 1999-02-10 | 2000-08-22 | Nas Toa Co Ltd | Defective diode detecting device |
| CN101957420A (en) * | 2010-09-19 | 2011-01-26 | 江苏省电力公司仪征市供电公司 | Device for testing polarities of mutual inductor of switchgear |
| CN108107314A (en) * | 2017-12-14 | 2018-06-01 | 国家电网公司 | A kind of polarity testing device of current transformer |
| CN109001587A (en) * | 2018-07-04 | 2018-12-14 | 云南电网有限责任公司 | Utilize the polar method of excitation surge current checking main transformer high-pressure side CT |
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2019
- 2019-03-14 CN CN201910193410.5A patent/CN109946560B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000232779A (en) * | 1999-02-10 | 2000-08-22 | Nas Toa Co Ltd | Defective diode detecting device |
| CN101957420A (en) * | 2010-09-19 | 2011-01-26 | 江苏省电力公司仪征市供电公司 | Device for testing polarities of mutual inductor of switchgear |
| CN108107314A (en) * | 2017-12-14 | 2018-06-01 | 国家电网公司 | A kind of polarity testing device of current transformer |
| CN109001587A (en) * | 2018-07-04 | 2018-12-14 | 云南电网有限责任公司 | Utilize the polar method of excitation surge current checking main transformer high-pressure side CT |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112180313A (en) * | 2020-09-02 | 2021-01-05 | 深圳市首航新能源股份有限公司 | Automatic correction method and control device for current transformer and energy storage equipment |
| CN112180313B (en) * | 2020-09-02 | 2023-11-10 | 深圳市首航新能源股份有限公司 | Automatic correction method, control device and energy storage equipment for current transformer |
| CN113078676A (en) * | 2021-04-02 | 2021-07-06 | 新风光电子科技股份有限公司 | Control method of current sensor direction and current loop decoupling direction interlocking mechanism |
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| CN109946560B (en) | 2021-04-30 |
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Effective date of registration: 20221103 Address after: Floor 9, Keshida Industrial Park R&D Building, No.7 Road, Gaoxinyuan West District, Guangming New District, Shenzhen, Guangdong 518000 Patentee after: SHENZHEN KSTAR NEW ENERGY Co.,Ltd. Address before: 518000 rooms 401 and 402, 4th floor, building 1, software park, kejizhong 2nd Road, Gaoxin North District, Nanshan District, Shenzhen City, Guangdong Province (office only) Patentee before: SHENZHEN KSTAR SCIENCE AND TECHNOLOGY Co.,Ltd. Patentee before: SHENZHEN KSTAR NEW ENERGY Co.,Ltd. |
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