WO2022105380A1 - 光伏逆变器的绝缘阻抗检测方法及装置 - Google Patents
光伏逆变器的绝缘阻抗检测方法及装置 Download PDFInfo
- Publication number
- WO2022105380A1 WO2022105380A1 PCT/CN2021/117567 CN2021117567W WO2022105380A1 WO 2022105380 A1 WO2022105380 A1 WO 2022105380A1 CN 2021117567 W CN2021117567 W CN 2021117567W WO 2022105380 A1 WO2022105380 A1 WO 2022105380A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- photovoltaic
- input
- insulation resistance
- preset
- inverter
- Prior art date
Links
- 238000009413 insulation Methods 0.000 title claims abstract description 140
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000001514 detection method Methods 0.000 claims abstract description 64
- 238000010248 power generation Methods 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 2
- 238000011423 initialization method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013082 photovoltaic technology Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
-
- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
-
- 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
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- 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
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
-
- 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
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
-
- 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
-
- 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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Definitions
- the present disclosure relates to the field of photovoltaic technology, and in particular, to a method and device for detecting insulation resistance of photovoltaic inverters.
- the input voltage of photovoltaic grid-connected inverters is relatively high.
- the input voltage of high-power photovoltaic grid-connected inverters can reach a maximum of 600V.
- Outdoor photovoltaic arrays are easily affected by dust, rain, snow, wind, etc., so that the degree of insulation of the photovoltaic input ends to the ground will be greatly affected.
- the detection of insulation resistance plays a vital role in personal safety.
- the photovoltaic grid-connected inverter must be tested for the insulation resistance (Riso) of the photovoltaic input array before starting up every day to determine whether it can be turned on.
- the insulation resistance of the dual-channel DCDC restricts each other during the detection process. If the first channel is already running, the second channel of photovoltaic is connected at this time, and the insulation resistance of the second channel of photovoltaic is directly performed, which may easily lead to insensitive insulation resistance detection and false alarms. .
- the present disclosure provides an insulation resistance detection method and device for a photovoltaic inverter, so as to at least solve the problem of inaccurate insulation detection in the prior art when two photovoltaic inputs are connected to the grid.
- a method for detecting insulation resistance of a photovoltaic inverter includes: when the first photovoltaic input has been connected When entering the photovoltaic inverter, check whether the second photovoltaic input needs to be connected to the photovoltaic inverter; if the second photovoltaic input needs to be connected to the photovoltaic inverter, control the first photovoltaic input to stop running, and then detect Insulation resistance of the second photovoltaic input; judge whether the insulation resistance of the second photovoltaic input satisfies the preset impedance condition; if the insulation resistance of the second photovoltaic input satisfies the preset impedance condition, control the second photovoltaic input to connect to the photovoltaic Inverter, and control the first photovoltaic input and the second photovoltaic input grid-connected operation.
- the method before the first photovoltaic input is connected to the photovoltaic inverter, the method further includes: controlling the unit where the photovoltaic inverter is located to perform initialization configuration; controlling the unit to perform safety self-inspection, and perform mode configuration after the safety self-inspection is passed. .
- the method further includes: judging whether the input voltage satisfies the preset voltage condition; if the input voltage satisfies the preset voltage condition, controlling the first photovoltaic input to be connected to the photovoltaic inverter.
- determining whether the input voltage satisfies the preset voltage condition includes: detecting whether the input voltage is greater than the preset first input voltage; if the input voltage is greater than the preset first input voltage, determining that the input voltage satisfies the preset voltage condition; Otherwise, after a preset delay, it is detected whether the input voltage is less than the preset second input voltage; wherein, the preset second input voltage is less than the preset first input voltage; if it is less than the preset second input voltage, determine the input voltage Preset voltage conditions are not met.
- controlling the unit where the photovoltaic inverter is located to perform initialization configuration includes: controlling each IO port to reset, and assigning initial values to each variable.
- control unit performs a safety self-check, including at least one of the following: detecting whether the grid frequency is normal, detecting whether the AD sampling bias voltage needs to be calibrated, and detecting whether the leakage current exceeds the standard.
- the method further includes: when the first photovoltaic input and the second photovoltaic input are not connected to the photovoltaic inverter, detecting whether the first photovoltaic input and the second photovoltaic input need to be connected to the photovoltaic inverter ; If the first photovoltaic input and the second photovoltaic input need to be connected to the photovoltaic inverter, the insulation resistance of the first photovoltaic input is detected to determine whether the insulation resistance of the first photovoltaic input meets the preset impedance conditions; If the insulation resistance of one photovoltaic input satisfies the preset impedance condition, the insulation resistance of the second photovoltaic input is detected, and it is judged whether the insulation resistance of the second photovoltaic input satisfies the preset impedance condition; if the insulation resistance of the second photovoltaic input meets the preset impedance condition Preset impedance conditions to control the grid-connected operation of the first photovoltaic input and the second photovoltaic
- a device for detecting insulation resistance of a photovoltaic inverter has two channels of photovoltaic input, and the device includes: an access detection module, which is used for the first channel of photovoltaic input.
- an access detection module which is used for the first channel of photovoltaic input.
- the insulation resistance of the photovoltaic input of the second channel is used to judge whether the insulation resistance of the second photovoltaic input meets the preset impedance condition; the control module, connected with the judgment module, is used to control the second photovoltaic input.
- the input is connected to the photovoltaic inverter, and controls the first photovoltaic input and the second photovoltaic input to connect to the grid.
- a photovoltaic power generation system including the above-mentioned insulation resistance detection device of a photovoltaic inverter.
- a photovoltaic air conditioner including the photovoltaic power generation system as described above.
- a storage medium containing computer-executable instructions, the computer-executable instructions, when executed by a computer processor, are used to perform insulation resistance detection of a photovoltaic inverter as described above method.
- an insulation resistance detection method for two photovoltaic inputs is proposed.
- one photovoltaic input is running normally, and another photovoltaic input is connected at this time, in order to detect the insulation resistance of the second photovoltaic input, this At this time, the first PV input will stop running, and then the insulation resistance of the second PV input will be judged. After the second insulation resistance test is completed, the two PVs will be run at the same time.
- the insulation resistance detection result of the second photovoltaic input is more accurate, which effectively solves the problem of inaccurate insulation detection and detection when the two photovoltaic inputs are connected to the grid, thereby improving the safety of the inverter. .
- FIG. 1 is an optional structural topology diagram of a system in which a photovoltaic inverter with two photovoltaic inputs is located according to an embodiment of the present disclosure
- FIG. 2 is an optional flowchart of an insulation resistance detection method of a photovoltaic inverter according to an embodiment of the present disclosure
- FIG. 4 is another optional flowchart of the method for detecting insulation resistance of a photovoltaic inverter according to an embodiment of the present disclosure
- FIG. 5 is an optional flowchart of a photovoltaic input voltage determination method according to an embodiment of the present disclosure.
- FIG. 6 is an optional structural block diagram of an insulation resistance detection device of a photovoltaic inverter according to an embodiment of the present disclosure.
- a preferred embodiment 1 of the present disclosure provides an insulation resistance detection method for a photovoltaic inverter, which is applied to a photovoltaic inverter with two photovoltaic inputs.
- Figure 1 shows an optional structural topology of the system where the photovoltaic inverter with two photovoltaic inputs is located. As shown in Figure 1, the two photovoltaics pass through EMI filters, and then pass through two DC/DC boosters respectively. The voltage is connected to the bus capacitor, followed by a bidirectional DC/AC topology, and then connected to the AC power through the EMI filter on the AC side.
- FIG. 2 shows an optional flowchart of the method for detecting the insulation resistance of the photovoltaic inverter. As shown in FIG. 2 , the method includes the following steps S202-S208:
- an insulation resistance detection method for two photovoltaic inputs is proposed.
- one photovoltaic input is running normally, when another photovoltaic input is connected at this time, in order to detect the insulation resistance of the second photovoltaic input, At this time, the first photovoltaic input will stop running, and then the insulation resistance of the second photovoltaic input will be judged. After the second insulation resistance test is completed, the two photovoltaics will be run at the same time.
- the insulation resistance detection result of the second photovoltaic input is more accurate, which effectively solves the problem of inaccurate insulation detection and detection when the two photovoltaic inputs are connected to the grid, thereby improving the safety of the inverter. .
- the method Before the first photovoltaic input is connected to the photovoltaic inverter, it also includes: controlling the system where the photovoltaic inverter is located to perform initialization configuration; controlling the unit to perform a safety self-check, and perform mode configuration after the safety self-check is passed. After the mode configuration is performed, the method further includes: judging whether the input voltage meets the preset voltage condition; if so, triggering the first photovoltaic input to be connected to the photovoltaic inverter.
- judging whether the input voltage meets the preset voltage condition includes: detecting whether the input voltage is greater than the preset first input voltage; if it is greater than the preset first input voltage, determining that the input voltage meets the preset voltage condition; otherwise, after a preset After the delay, it is detected whether the input voltage is less than the preset second input voltage; wherein, the preset second input voltage is less than the preset first input voltage; if it is less than the preset second input voltage, it is determined that the input voltage does not meet the preset voltage condition .
- Perform initialization configuration including: controlling the reset of each IO port, and assigning initial values to each variable.
- Carry out a safety self-check including at least one of the following: check whether the grid frequency is normal, check whether the AD sampling bias voltage needs to be calibrated, and check whether the leakage current exceeds the standard.
- FIG. 3 shows an optional flow chart of the above initialization method. As shown in FIG. 3 , the method includes the following steps: system initialization - grid frequency detection configuration - AD sampling offset calibration - leakage current circuit self-test - mode configuration Task - System Normal Mode.
- the inverter once the inverter is powered on, it needs to go through multiple steps to check whether the hardware of the unit is normal, so as to ensure the normal operation of the unit.
- the initial configuration of the unit operation is mainly to reset each IO port controlled by the CPU and assign each variable to the initial value. Due to the influence of temperature drift and zero drift, there will be large errors in the detection values of the current sensor and voltage sensor.
- the It is calibrated at power-on to ensure accuracy; according to the single-fault detection regulations in the safety standard (IEC62109-2) of the inverter, self-test of the leakage current sensor is required to judge whether the leakage current sensor is before power-on.
- the unit has multiple modes configuration, change the PWM modulation mode, whether it has the photovoltaic restart function, air conditioning mode or inverter mode, if the user does not configure it, it will be defaulted
- the configuration works fine.
- the system can perform one of the three cases of only connecting one of the two channels, connecting two channels at the same time, connecting one channel first, and then connecting the other channel, specifically:
- the unit performs initialization configuration, detects the grid frequency, AD calibration verification, leakage current self-test, mode configuration, after all the previous tests are completed normally, judge the input voltage value of the photovoltaic side, and use hysteresis Loop judgment, if the input voltage meets the conditions, judge whether the insulation resistance judgment flag is 0. Only when the insulation resistance flag of the circuit is 0, the insulation resistance judgment will start, and the insulation resistance judgment flag will be set to 1 at the same time. Otherwise, return, Continue to judge the insulation resistance flag to be tested, and start to calculate the insulation resistance results of PV input 1 positive-to-ground and negative-to-ground. Compare this result with the set protection to see if there is any abnormal insulation detection. If it is normal, you can enter the next link. Power generation, and reset the first insulation resistance judgment flag at the same time;
- FIG. 4 shows an optional flowchart of the above-mentioned method for detecting insulation resistance of a photovoltaic inverter. As shown in FIG. 4 , the method includes the following steps S401-S419:
- S405 Set the insulation resistance judgment flag of the second channel to 1, and perform insulation resistance detection on the second channel;
- S414 Set the insulation resistance judgment flag of the first channel to 1, and perform insulation resistance detection on the first channel;
- This situation refers to the fact that one way of photovoltaic is already running normally, and the other way of photovoltaic is connected at this time.
- the first way is running, and the second way of photovoltaic is connected at this time.
- the first circuit is running normally, but the operating conditions of the first circuit include the judgment of the insulation resistance flag of the second circuit.
- the first channel of photovoltaic will stop running, and then the insulation resistance of the second channel of photovoltaics will be judged. After the second channel of insulation resistance detection is completed, the two channels of photovoltaics will be operated at the same time.
- FIG. 5 shows an optional flowchart of the method, as shown in FIG. 5 . As shown, the method includes the following steps S502-S510:
- the open-circuit voltage hysteresis detection is added, so that the open-circuit voltage fluctuation will not cause the photovoltaic to restart, and avoid the photovoltaic restarting repeatedly when the photovoltaic open-circuit voltage changes near the lower limit, so as to ensure the photovoltaic power generation rate.
- FIG. 6 shows the An optional structural block diagram of the device, as shown in Figure 6, the device includes:
- the access detection module 602 is used to detect whether the second photovoltaic input needs to be connected to the photovoltaic inverter when the first photovoltaic input has been connected to the photovoltaic inverter;
- the insulation resistance detection module 604 is connected to the access detection module 602, and is used for detecting the insulation resistance of the second photovoltaic input after controlling the first photovoltaic input to stop running;
- the judgment module 606 is connected to the insulation resistance detection module 604, and is used for judging whether the insulation resistance of the second photovoltaic input satisfies the preset resistance condition;
- the control module 608, connected to the judgment module 606, is used for controlling the second photovoltaic input to be connected to the photovoltaic inverter, and controlling the first photovoltaic input and the second photovoltaic input to operate in grid connection.
- an insulation resistance detection method for two photovoltaic inputs is proposed.
- one photovoltaic input is running normally, when another photovoltaic input is connected at this time, in order to detect the insulation resistance of the second photovoltaic input, At this time, the first photovoltaic input will stop running, and then the insulation resistance of the second photovoltaic input will be judged. After the second insulation resistance test is completed, the two photovoltaics will be run at the same time.
- the insulation resistance detection result of the second photovoltaic input is more accurate, which effectively solves the problem of inaccurate insulation detection and detection when the two photovoltaic inputs are connected to the grid, thereby improving the safety of the inverter. .
- a photovoltaic power generation system is also provided in a preferred embodiment 3 of the present disclosure, including the insulation resistance detection device of the photovoltaic inverter as described above.
- an insulation resistance detection method for two photovoltaic inputs is proposed.
- one photovoltaic input is running normally, when another photovoltaic input is connected at this time, in order to detect the insulation resistance of the second photovoltaic input, At this time, the first photovoltaic input will stop running, and then the insulation resistance of the second photovoltaic input will be judged. After the second insulation resistance test is completed, the two photovoltaics will be run at the same time.
- the insulation resistance detection result of the second photovoltaic input is more accurate, which effectively solves the problem of inaccurate insulation detection and detection when the two photovoltaic inputs are connected to the grid, thereby improving the safety of the inverter. .
- a photovoltaic air conditioner is also provided in a preferred embodiment 4 of the present disclosure, including the photovoltaic power generation system as described above.
- an insulation resistance detection method for two photovoltaic inputs is proposed.
- one photovoltaic input is running normally, when another photovoltaic input is connected at this time, in order to detect the insulation resistance of the second photovoltaic input, At this time, the first photovoltaic input will stop running, and then the insulation resistance of the second photovoltaic input will be judged. After the second insulation resistance test is completed, the two photovoltaics will be run at the same time.
- the insulation resistance detection result of the second photovoltaic input is more accurate, which effectively solves the problem of inaccurate insulation detection and detection when the two photovoltaic inputs are connected to the grid, thereby improving the safety of the inverter. .
- a preferred embodiment 4 of the present disclosure also provides a storage medium containing computer-executable instructions, where the computer-executable instructions are stored by a computer When executed by the processor, the method for detecting the insulation resistance of the photovoltaic inverter as described above is executed.
- an insulation resistance detection method for two photovoltaic inputs is proposed.
- one photovoltaic input is running normally, when another photovoltaic input is connected at this time, in order to detect the insulation resistance of the second photovoltaic input, At this time, the first photovoltaic input will stop running, and then the insulation resistance of the second photovoltaic input will be judged. After the second insulation resistance test is completed, the two photovoltaics will be run at the same time.
- the insulation resistance detection result of the second photovoltaic input is more accurate, which effectively solves the problem of inaccurate insulation detection and detection when the two photovoltaic inputs are connected to the grid, thereby improving the safety of the inverter. .
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Photovoltaic Devices (AREA)
- Inverter Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
Description
Claims (11)
- 一种光伏逆变器的绝缘阻抗检测方法,所述光伏逆变器有两路光伏输入,所述方法包括:在第一路光伏输入已经接入所述光伏逆变器时,检测第二路光伏输入是否需要接入所述光伏逆变器;如果所述第二路光伏输入需要接入所述光伏逆变器,则控制所述第一路光伏输入停止运行,之后检测所述第二路光伏输入的绝缘阻抗;判断所述第二路光伏输入的绝缘阻抗是否满足预设阻抗条件;如果所述第二路光伏输入的绝缘阻抗满足预设阻抗条件,则控制所述第二路光伏输入接入所述光伏逆变器,并控制所述第一路光伏输入和所述第二路光伏输入并网运行。
- 根据权利要求1所述的光伏逆变器的绝缘阻抗检测方法,在所述第一路光伏输入接入所述光伏逆变器前,还包括:控制所述光伏逆变器所在机组进行初始化配置;控制所述机组进行安全自检,在所述安全自检合格后进行模式配置。
- 根据权利要求2所述的光伏逆变器的绝缘阻抗检测方法,在进行模式配置之后,还包括:判断输入电压是否满足预设电压条件;如果输入电压满足预设电压条件,则控制所述第一路光伏输入接入所述光伏逆变器。
- 根据权利要求3所述的光伏逆变器的绝缘阻抗检测方法,其中,所述判断输入电压是否满足预设电压条件,包括:检测所述输入电压是否大于预设第一输入电压;如果所述输入电压大于所述预设第一输入电压,确定所述输入电压满足所述预设电压条件;否则,在经过预设延时后,检测所述输入电压是否小于预设第二输入电压;其中, 所述预设第二输入电压小于所述预设第一输入电压;如果小于所述预设第二输入电压,确定所述输入电压不满足所述预设电压条件。
- 根据权利要求2所述的光伏逆变器的绝缘阻抗检测方法,其中,控制所述光伏逆变器所在机组进行初始化配置,包括:控制各个IO口复位,并将各个变量赋初始值。
- 根据权利要求2所述的光伏逆变器的绝缘阻抗检测方法,其中,控制所述机组进行安全自检,包括以下至少之一:检测电网频率是否正常、检测AD采样偏置电压是否需要校准、检测漏电流是否超标。
- 根据权利要求1至6中任一项所述的光伏逆变器的绝缘阻抗检测方法,还包括:在所述第一路光伏输入和所述第二路光伏输入未接入所述光伏逆变器时,检测所述第一路光伏输入和所述第二路光伏输入是否需要接入所述光伏逆变器;如果所述第一路光伏输入和所述第二路光伏输入需要接入所述光伏逆变器,则检测所述第一路光伏输入的绝缘阻抗,判断所述第一路光伏输入的绝缘阻抗是否满足预设阻抗条件;如果所述第一路光伏输入的绝缘阻抗满足所述预设阻抗条件,则检测所述第二路光伏输入的绝缘阻抗,判断所述第二路光伏输入的绝缘阻抗是否满足所述预设阻抗条件;如果所述第二路光伏输入的绝缘阻抗满足所述预设阻抗条件,控制所述第一路光伏输入和所述第二路光伏输入并网运行。
- 一种光伏逆变器的绝缘阻抗检测装置,所述光伏逆变器有两路光伏输入,所述装置包括:接入检测模块,用于在第一路光伏输入已经接入所述光伏逆变器时,检测第二路光伏输入是否需要接入所述光伏逆变器;绝缘阻抗检测模块,与接入检测模块连接,用于在所述第一路光伏输入停止运行 之后检测所述第二路光伏输入的绝缘阻抗;判断模块,与绝缘阻抗检测模块连接,用于判断所述第二路光伏输入的绝缘阻抗是否满足预设阻抗条件;和控制模块,与判断模块连接,用于控制所述第二路光伏输入接入所述光伏逆变器,并控制所述第一路光伏输入和所述第二路光伏输入并网运行。
- 一种光伏发电***,包括如权利要求8所述的光伏逆变器的绝缘阻抗检测装置。
- 一种光伏空调,包括如权利要求9所述的光伏发电***。
- 一种包含计算机可执行指令的存储介质,所述计算机可执行指令在由计算机处理器执行时用于执行如权利要求1至7中任一项所述的光伏逆变器的绝缘阻抗检测方法。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP21893531.0A EP4166953A4 (en) | 2020-11-20 | 2021-09-10 | METHOD AND DEVICE FOR DETECTING THE ISOLATION IMPEDANCE OF A PHOTOVOLTAIC INVERTER |
US18/016,399 US20230288461A1 (en) | 2020-11-20 | 2021-09-10 | Method and Device for Detecting Insulation Impedance of Photovoltaic Inverter |
AU2021381605A AU2021381605A1 (en) | 2020-11-20 | 2021-09-10 | Method and apparatus for detecting insulation impedance of photovoltaic inverter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202011312257.2A CN112557754B (zh) | 2020-11-20 | 2020-11-20 | 光伏逆变器的绝缘阻抗检测方法及装置 |
CN202011312257.2 | 2020-11-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022105380A1 true WO2022105380A1 (zh) | 2022-05-27 |
Family
ID=75044390
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2021/117567 WO2022105380A1 (zh) | 2020-11-20 | 2021-09-10 | 光伏逆变器的绝缘阻抗检测方法及装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20230288461A1 (zh) |
EP (1) | EP4166953A4 (zh) |
CN (1) | CN112557754B (zh) |
AU (1) | AU2021381605A1 (zh) |
WO (1) | WO2022105380A1 (zh) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112557754B (zh) * | 2020-11-20 | 2021-11-16 | 珠海格力电器股份有限公司 | 光伏逆变器的绝缘阻抗检测方法及装置 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103091560A (zh) * | 2012-12-24 | 2013-05-08 | 江苏兆伏新能源有限公司 | 双路光伏输入的绝缘阻抗检测电路以及检测方法 |
US20150054523A1 (en) * | 2013-08-26 | 2015-02-26 | Fraunhofer Usa, Inc. | Devices and techniques for detecting faults in photovoltaic systems |
CN105548712A (zh) * | 2015-12-21 | 2016-05-04 | 珠海格力电器股份有限公司 | 逆变器及其方阵绝缘阻抗检测***、方法和计算单元 |
CN205229304U (zh) * | 2015-12-21 | 2016-05-11 | 珠海格力电器股份有限公司 | 逆变器及其方阵绝缘阻抗检测*** |
CN106324359A (zh) * | 2015-06-24 | 2017-01-11 | 中兴通讯股份有限公司 | 光伏逆变器的绝缘阻抗检测方法及装置 |
CN108896822A (zh) * | 2018-07-19 | 2018-11-27 | 阳光电源股份有限公司 | 光伏并网逆变器的绝缘阻抗检测***和方法 |
CN112557754A (zh) * | 2020-11-20 | 2021-03-26 | 珠海格力电器股份有限公司 | 光伏逆变器的绝缘阻抗检测方法及装置 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1909369B1 (de) * | 2006-10-06 | 2020-05-20 | Schmidhauser AG | Schaltungsanordnung und Verfahren zur Isolationsüberwachung für im Betrieb befindliche Umrichteranwendungen |
EP2230522B1 (de) * | 2009-03-16 | 2011-05-11 | SMA Solar Technology AG | Verfahren und Vorrichtung zur Isolationsüberwachung eines Netzes ohne Neutralleiter |
CN103048544B (zh) * | 2012-12-13 | 2015-03-11 | 常熟开关制造有限公司(原常熟开关厂) | 一种光伏发电***的绝缘阻抗监测方法 |
CN104977471B (zh) * | 2014-04-11 | 2018-02-16 | 维谛技术有限公司 | 双路输入光伏逆变器对地绝缘阻抗检测***、方法及装置 |
CN104535839B (zh) * | 2014-12-24 | 2017-05-17 | 常熟开关制造有限公司(原常熟开关厂) | 光伏并网逆变器的绝缘阻抗检测方法及实现其的检测装置 |
CN204439723U (zh) * | 2015-01-31 | 2015-07-01 | 华南理工大学 | 一种应用于光伏逆变器的三路输入绝缘阻抗检测电路 |
CN106208129B (zh) * | 2016-06-21 | 2019-10-29 | 阳光电源股份有限公司 | 并联直流电源的接入控制方法及其应用的装置 |
CN106771834B (zh) * | 2017-02-25 | 2019-07-12 | 华为技术有限公司 | 一种多直流源输入接线检测***及光伏组串式逆变器*** |
CN108427038A (zh) * | 2017-12-22 | 2018-08-21 | 深圳市中兴昆腾有限公司 | 一种多路输入光伏逆变器对地绝缘阻抗检测方法 |
-
2020
- 2020-11-20 CN CN202011312257.2A patent/CN112557754B/zh active Active
-
2021
- 2021-09-10 EP EP21893531.0A patent/EP4166953A4/en active Pending
- 2021-09-10 AU AU2021381605A patent/AU2021381605A1/en active Pending
- 2021-09-10 US US18/016,399 patent/US20230288461A1/en active Pending
- 2021-09-10 WO PCT/CN2021/117567 patent/WO2022105380A1/zh unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103091560A (zh) * | 2012-12-24 | 2013-05-08 | 江苏兆伏新能源有限公司 | 双路光伏输入的绝缘阻抗检测电路以及检测方法 |
US20150054523A1 (en) * | 2013-08-26 | 2015-02-26 | Fraunhofer Usa, Inc. | Devices and techniques for detecting faults in photovoltaic systems |
CN106324359A (zh) * | 2015-06-24 | 2017-01-11 | 中兴通讯股份有限公司 | 光伏逆变器的绝缘阻抗检测方法及装置 |
CN105548712A (zh) * | 2015-12-21 | 2016-05-04 | 珠海格力电器股份有限公司 | 逆变器及其方阵绝缘阻抗检测***、方法和计算单元 |
CN205229304U (zh) * | 2015-12-21 | 2016-05-11 | 珠海格力电器股份有限公司 | 逆变器及其方阵绝缘阻抗检测*** |
CN108896822A (zh) * | 2018-07-19 | 2018-11-27 | 阳光电源股份有限公司 | 光伏并网逆变器的绝缘阻抗检测***和方法 |
CN112557754A (zh) * | 2020-11-20 | 2021-03-26 | 珠海格力电器股份有限公司 | 光伏逆变器的绝缘阻抗检测方法及装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP4166953A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP4166953A4 (en) | 2024-01-03 |
US20230288461A1 (en) | 2023-09-14 |
EP4166953A1 (en) | 2023-04-19 |
CN112557754B (zh) | 2021-11-16 |
AU2021381605A1 (en) | 2023-02-16 |
CN112557754A (zh) | 2021-03-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN107807319B (zh) | 一种绝缘栅双极型晶体管igbt测试电路及方法 | |
US9799779B2 (en) | Systems and methods for photovoltaic string protection | |
JP5638080B2 (ja) | 電子スイッチを備える光起電力デバイス | |
TWI467887B (zh) | 電池管理系統、方法及其非瞬態電腦可讀媒體 | |
US20190074684A1 (en) | System and Method for Controlling a String-Level Rapid Shutdown Device for a Solar Panel Array | |
JP2001275259A (ja) | 系統連系インバータおよび分散形発電システム | |
JP2014011428A (ja) | 故障検知装置、故障検知システム、及び故障検知方法 | |
US20160313387A1 (en) | Method And Power Converter For Determining Cell Capacitor Degradation In A Converter Cell | |
KR20120027181A (ko) | 태양광 발전기 고장 진단 방법 | |
WO2022105380A1 (zh) | 光伏逆变器的绝缘阻抗检测方法及装置 | |
CN109655757B (zh) | 一种ups制式的检测方法及*** | |
JP2015018838A (ja) | 太陽電池用逆流防止ダイオードの故障検出装置、太陽電池用逆流防止ダイオードの故障検出システム、及び太陽電池用逆流防止ダイオードの故障検出方法 | |
US11909353B2 (en) | Ground-fault detecting device and related method | |
KR101248592B1 (ko) | 태양광 모듈의 절연저항 및 누설전류 계측 시스템 | |
JP5496052B2 (ja) | 太陽光発電システム | |
CN111308389B (zh) | 一种变流器及其功率半导体器件漏电流自检方法 | |
WO2020177639A1 (zh) | 绝缘检测电路及检测方法、电池管理*** | |
JP6446900B2 (ja) | 太陽光発電システムの検査装置および太陽光発電システムの検査方法 | |
US20110246105A1 (en) | Method and apparatus for testing at least one temperature sensor in a vehicle | |
AU2015200062B2 (en) | Intelligent air conditioner socket with abnormality alarm | |
TW201918015A (zh) | 接地檢測裝置 | |
JP2014011430A (ja) | 太陽電池検査用電流制御装置 | |
CN110556789B (zh) | 一种车载逆变器输出滤波电容的故障保护方法及*** | |
JP2018098922A (ja) | 太陽光発電システムの検査装置および検査方法 | |
JP2021063663A (ja) | アーク検出装置、ブレーカ、パワーコンディショナ、太陽光パネル、太陽光パネル付属モジュール、接続箱、アーク検出システム及びアーク検出方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 21893531 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2021893531 Country of ref document: EP Effective date: 20230116 |
|
ENP | Entry into the national phase |
Ref document number: 2021381605 Country of ref document: AU Date of ref document: 20210910 Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |