CN107677902A - A kind of passive type island state detection method - Google Patents
A kind of passive type island state detection method Download PDFInfo
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- CN107677902A CN107677902A CN201710804475.XA CN201710804475A CN107677902A CN 107677902 A CN107677902 A CN 107677902A CN 201710804475 A CN201710804475 A CN 201710804475A CN 107677902 A CN107677902 A CN 107677902A
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- current transformer
- harmonic components
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- error
- island state
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- General Physics & Mathematics (AREA)
- Power Conversion In General (AREA)
Abstract
A kind of passive type island state detection method, comprises the following steps：1) grid-connected power generation system is connected by current transformer with power network, current transformer adds dead band in control in gate electrode drive signals；Dead band causes current transformer nonlinear control characteristic occur, causes the error of current transformer actual output voltage, and the error is relevant with the direction of output current of converter, and error voltage causes to contain harmonic components in current transformer output voltage；2) it is used as by detecting harmonic components in output current of converter and judges the foundation of island state, impedance very little of the power network line stray inductance in low-frequency range, when micro-capacitance sensor is in networking state, connecting valve is in closure state, the external impedance very little of current transformer, therefore the harmonic components in output current are bigger；When micro-capacitance sensor is in island state, connecting valve disconnects, and the extrernal resistance resistance of current transformer is big, and the harmonic components in output current diminish；With very high accuracy of detection and detection speed.
Description
Technical field
The invention belongs to Power Quality Detection technical field, and in particular to a kind of passive type island state detection method, use
The detection of the running status of micro-capacitance sensor in power system.
Background technology
With the development of generation of electricity by new energy, the micro-capacitance sensor being made up of distributed generation system is largely accessed in traditional power network.
Isolated island detection is one of key issue that micro-capacitance sensor flexibly controls.It refers in the case of grid collapses, is incorporated into the power networks
Distributed generation system is disconnected with power network, and the miniature self-energizing network of to be formed one is loaded with surrounding.Because distribution is sent out
Electric system is being incorporated into the power networks with the case of islet operation, used control model difference, only quickly and accurately detecting orphan
Island running status, the smooth switching of distributed generation system control model could be realized, therefore, isolated island detection has particularly significant
Realistic meaning.
Island detection method has the active and class of passive type two at present.Active detection method class method is different by adding
Interference signal broken the balance that micro-capacitance sensor under island operation state is run, common point voltage or frequency is exceeded threshold value model
Enclose, so as to detect isolated island, such method accuracy of detection is high, check frequency is small, but can reduce the quality of power supply of inverter output,
Mostly there is destructiveness.The advantages of passive type detection method is to realize simply, and shortcoming is point of common coupling electricity after isolated island occurs
When pressure is in non-detection area, the problem of None- identified be present.Therefore an accurate, nondestructive island state detection is found
Method has vital meaning.
The content of the invention
To overcome above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of passive type island state detection side
Method, solve the technical problem that existing passive type detection method has check frequency, there is very high accuracy of detection and detection speed
Degree.
To achieve the above object, the technical solution adopted by the present invention is：A kind of passive type island state detection method, including
Following steps：
1) grid-connected power generation system is connected by current transformer with power network, current transformer is in control, in order to avoid same bridge
The upper, lower tube of arm is simultaneously turned on, and dead band is added in gate electrode drive signals；It is special that dead band causes current transformer nonlinear control occur
Property, cause the error of current transformer actual output voltage, and the error is relevant with the direction of output current of converter, error voltage is led
Cause to contain harmonic components in current transformer output voltage；
2) it is used as by detecting harmonic components in output current of converter and judges the foundation of island state, power network line is parasitic
Impedance very little of the inductance in low-frequency range, when micro-capacitance sensor is in networking state, connecting valve is in closure state, current transformer
External impedance very little, therefore the harmonic components in output current are bigger.When micro-capacitance sensor is in island state, connecting valve breaks
Open, the extrernal resistance resistance of current transformer is big, and the harmonic components in output current diminish.
Described current transformer is distributed power generation current transformer.
The beneficial effects of the invention are as follows：
Current transformer is in actually controlling, it will usually adds dead band in the drive signal of the upper, lower tube of same bridge arm, avoids
Damaged caused by straight-through.The effect in dead band is to cause current transformer that necessarily non-linear is presented, and harmonic wave point is contained in its output voltage
Amount.This detection algorithm utilizes this characteristic of current transformer, by detecting the harmonic components content in output current, judges micro-capacitance sensor
Island operation state.The present invention proposes that a kind of new passive type island detection method does not change the original structure of current transformer and control
System, you can realize the detection of micro-capacitance sensor island state, and there is very high accuracy of detection and detection speed.
Brief description of the drawings
Fig. 1 is the drive signal figure that the upper and lower bridge arm of the present invention is added behind dead band.
Fig. 2 is current transformer output voltage error figure of the present invention.
Fig. 3 is the equivalent external impedance circuit structure diagram of micro-capacitance sensor current transformer of the present invention.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
A kind of passive type island state detection method, comprises the following steps：
1) grid-connected power generation system is connected by current transformer with power network, current transformer is in control, in order to avoid same bridge
The upper, lower tube of arm is simultaneously turned on, and dead band is added in gate electrode drive signals, referring to Fig. 1, T in figuredFor dead time；Lead in dead band
Cause current transformer nonlinear control characteristic occur, cause the error of current transformer actual output voltage, and the error and current transformer are defeated
It is relevant to go out sense of current, error voltage causes to contain harmonic components in current transformer output voltage, referring to Fig. 2, works as the sense of current
For timing, error voltage is negative value；Otherwise when the sense of current for it is negative when, error voltage be on the occasion of.The error voltage causes unsteady flow
Contain harmonic components in device output voltage；
2) be used as by detecting harmonic components in output current of converter and judge the foundation of island state, micro-capacitance sensor operation with
During grid-connected or island state, the impedance of current transformer external circuit is different, resistance of the power network line stray inductance in low-frequency range
Anti- very little, when micro-capacitance sensor is in networking state, connecting valve is in closure state, the external impedance very little of current transformer, therefore defeated
The harmonic components gone out in electric current are bigger.When micro-capacitance sensor is in island state, connecting valve disconnects, the extrernal resistance resistance of current transformer
Greatly, the harmonic components in output current diminish.Referring to Fig. 3.
Claims (2)
1. a kind of passive type island state detection method, it is characterised in that comprise the following steps：
1) grid-connected power generation system is connected by current transformer with power network, current transformer is in control, in order to avoid same bridge arm
Upper, lower tube is simultaneously turned on, and dead band is added in gate electrode drive signals；Dead band causes current transformer nonlinear control characteristic occur,
Cause the error of current transformer actual output voltage, and the error is relevant with the direction of output current of converter, error voltage causes
Contain harmonic components in current transformer output voltage；
2) it is used as by detecting harmonic components in output current of converter and judges the foundation of island state, power network line stray inductance
Impedance very little in low-frequency range, when micro-capacitance sensor is in networking state, connecting valve is in closure state, the extrernal resistance of current transformer
Anti- very little, therefore the harmonic components in output current are bigger.When micro-capacitance sensor is in island state, connecting valve disconnects, and becomes
The extrernal resistance resistance of stream device is big, and the harmonic components in output current diminish.
2. a kind of passive type island state detection method according to claim 1, it is characterised in that described current transformer is
Distributed power generation current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710804475.XA CN107677902A (en) | 2017-09-08 | 2017-09-08 | A kind of passive type island state detection method |
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| CN201710804475.XA CN107677902A (en) | 2017-09-08 | 2017-09-08 | A kind of passive type island state detection method |
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| CN107677902A true CN107677902A (en) | 2018-02-09 |
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| CN201710804475.XA Pending CN107677902A (en) | 2017-09-08 | 2017-09-08 | A kind of passive type island state detection method |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101488664A (en) * | 2009-02-27 | 2009-07-22 | 上海航锐电源科技有限公司 | Anti-island effect protection method based on output current frequency disturbance |
| CN102253283A (en) * | 2011-06-20 | 2011-11-23 | 山东电力集团公司临沂供电公司 | Island detection method based on wavelet packet energy spectrum |
| CN103296916A (en) * | 2013-05-10 | 2013-09-11 | 上海大学 | Dead zone elimination method based on inverter invalid switch |
| CN105629114A (en) * | 2016-03-03 | 2016-06-01 | 西安科技大学 | Islanding detection method based on voltage harmonic fault component |
| CN105974272A (en) * | 2016-07-26 | 2016-09-28 | 上海电气分布式能源科技有限公司 | Passive island detection method |
| CN106154117A (en) * | 2016-09-13 | 2016-11-23 | 上海电机学院 | A kind of combined method of distributed grid-connected isolated island detection |
| CN106253338A (en) * | 2016-08-21 | 2016-12-21 | 南京理工大学 | A kind of micro-capacitance sensor stable control method based on adaptive sliding-mode observer |
| CN107134798A (en) * | 2017-04-28 | 2017-09-05 | 华中科技大学 | PCC Voltage unbalances and harmonic suppressing method based on parallel virtual impedance |
-
2017
- 2017-09-08 CN CN201710804475.XA patent/CN107677902A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101488664A (en) * | 2009-02-27 | 2009-07-22 | 上海航锐电源科技有限公司 | Anti-island effect protection method based on output current frequency disturbance |
| CN102253283A (en) * | 2011-06-20 | 2011-11-23 | 山东电力集团公司临沂供电公司 | Island detection method based on wavelet packet energy spectrum |
| CN103296916A (en) * | 2013-05-10 | 2013-09-11 | 上海大学 | Dead zone elimination method based on inverter invalid switch |
| CN105629114A (en) * | 2016-03-03 | 2016-06-01 | 西安科技大学 | Islanding detection method based on voltage harmonic fault component |
| CN105974272A (en) * | 2016-07-26 | 2016-09-28 | 上海电气分布式能源科技有限公司 | Passive island detection method |
| CN106253338A (en) * | 2016-08-21 | 2016-12-21 | 南京理工大学 | A kind of micro-capacitance sensor stable control method based on adaptive sliding-mode observer |
| CN106154117A (en) * | 2016-09-13 | 2016-11-23 | 上海电机学院 | A kind of combined method of distributed grid-connected isolated island detection |
| CN107134798A (en) * | 2017-04-28 | 2017-09-05 | 华中科技大学 | PCC Voltage unbalances and harmonic suppressing method based on parallel virtual impedance |
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| CB02 | Change of applicant information |
Address after: 710304 15 buildings in two district, hugao enterprise accelerator, Xi'an high tech Zone, Shaanxi Applicant after: Xi'an Yi Fei nuclear power equipment Limited by Share Ltd Address before: 710304 15 buildings in two district, hugao enterprise accelerator, Xi'an high tech Zone, Shaanxi Applicant before: Xi'an Thorpe Electric Technology Co., Ltd. |
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180209 |