WO2018177336A1 - Photovoltaic direct current grounding device - Google Patents

Photovoltaic direct current grounding device Download PDF

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WO2018177336A1
WO2018177336A1 PCT/CN2018/080954 CN2018080954W WO2018177336A1 WO 2018177336 A1 WO2018177336 A1 WO 2018177336A1 CN 2018080954 W CN2018080954 W CN 2018080954W WO 2018177336 A1 WO2018177336 A1 WO 2018177336A1
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photovoltaic
current
grounding device
measuring unit
leakage current
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PCT/CN2018/080954
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French (fr)
Chinese (zh)
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陈大英
李建
魏垚
巴俊生
胡曦
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北京铂阳顶荣光伏科技有限公司
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Publication of WO2018177336A1 publication Critical patent/WO2018177336A1/en

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    • 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
    • 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

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  • the present disclosure relates to the field of photovoltaic technology, and more particularly to a photovoltaic DC grounding device.
  • the present disclosure provides a photovoltaic DC grounding device, which can realize flexible control of the DC grounding of the DC terminal.
  • the present disclosure provides a photovoltaic DC grounding device comprising: a resistor (11) connected between a negative electrode PV- and a current measuring unit (12) of a photovoltaic direct current system; configured to measure through the photovoltaic direct current a current measuring unit (12) for ground leakage current of the grounding device; and, configured to control the on or off of the photovoltaic DC grounding device and the ground PE according to the ground leakage current measured by the current measuring unit (12) Break the control unit (13).
  • the method further includes: connecting the current monitoring unit (14) to the current measuring unit (12), and configured to display the measured ground leakage current in real time.
  • the on/off control unit (13) may be configured to: when the measured ground leakage current is less than a preset first current threshold I1, disconnect the photovoltaic DC grounding device from the ground; Disconnecting the photovoltaic DC grounding device from the ground when the measured ground leakage current is greater than a preset second current threshold I2; when the measured ground leakage current is greater than or equal to a preset first When the current threshold I1 is less than or equal to the preset second current threshold I2, the connection of the photovoltaic DC grounding device to the ground is turned on.
  • the resistor (11) is a linear resistor.
  • the resistance of the resistor (11) is not less than 30 k ⁇ K ⁇ .
  • the current measuring unit (12) comprises a current sensor, a signal conversion circuit, and a transmission circuit.
  • the current sensor is an electromagnetic current transformer, or an electronic current transformer.
  • the current sensor has an accuracy of milliampere mA.
  • the on/off control unit 13 includes an electronic, electrical component, and control circuit that performs an opening and closing operation according to a current.
  • the electronic and electrical components that perform the opening and closing operation are current relays or miniature circuit breakers.
  • the solution provided by the present disclosure includes: a resistance connected between a negative electrode PV- and a current measuring unit of the photovoltaic direct current system; a current measuring unit configured to measure a ground leakage current of the photovoltaic direct current grounding device provided by the present disclosure, and configured to be The ground leakage current measured by the current measuring unit controls the on/off control unit of the photovoltaic DC grounding device and the ground PE provided or closed by the present disclosure.
  • the photovoltaic DC grounding device provided by the present disclosure the grounding of the photovoltaic DC grounding device provided by the present disclosure is controlled by the real-time earth leakage current value, the occurrence of PID and TCO corrosion is prevented, and the flexible control of the DC terminal negative ground is realized.
  • the long-term positive bias state of the photovoltaic component is avoided, which adversely affects the power generation efficiency of the photovoltaic component, thereby increasing the safety and reliability of the photovoltaic component system.
  • the photovoltaic DC grounding device realizes visual observation of the working condition by real-time monitoring of the ground leakage current data, facilitates determining the DC system failure, and facilitates the work by storing the data. The handling of faults by personnel.
  • FIG. 1 is a schematic structural diagram of a photovoltaic DC grounding device according to the present disclosure.
  • the inventor of the present disclosure believes that, on the one hand, in general, the PV module does not exhibit PID or TCO corrosion, that is, usually the PV module does not need to be grounded at the negative electrode; on the other hand, if the PV module is in a positive bias for a long time The state, that is, the state after the negative terminal of the DC terminal is grounded, adversely affects the power generation efficiency of the photovoltaic module. Therefore, the inventors of the present disclosure have proposed a photovoltaic DC grounding device, which can realize flexible control of the grounding of the negative terminal of the DC terminal, and avoid the long-term bias state of the photovoltaic component.
  • the photovoltaic DC grounding device 1 includes: a resistor 11, a current measuring unit 12, and an on/off control unit 13; wherein one end of the resistor 11 and the photovoltaic The cathode of the DC system is PV-connected, and the other end of the resistor 11 is connected to the current measuring unit 12; the current measuring unit 12 is arranged to measure the ground leakage current through the photovoltaic DC grounding device provided by the present disclosure.
  • the on-off control unit 13 is arranged to control the on or off of the photovoltaic DC grounding device and the ground PE provided by the present disclosure according to the ground leakage current measured by the current measuring unit 12.
  • the photovoltaic component when the measured ground leakage current is less than the preset first current threshold I1, it is determined that the photovoltaic component does not have potential induced attenuation, and the connection of the photovoltaic DC grounding device provided by the present disclosure to the earth is disconnected;
  • the ground leakage current is greater than the preset second current threshold I2, it is determined that the photovoltaic module leakage current may affect the safety of the operator.
  • the connection of the photovoltaic DC grounding device provided by the present disclosure to the earth is disconnected; when the measured pair is When the ground leakage current is greater than or equal to the preset first current threshold I1 is less than or equal to the preset second current threshold I2, the connection of the photovoltaic DC grounding device provided by the present disclosure to the ground is turned on, and the negative potential of the photovoltaic direct current system is not lower than 0. .
  • the first current threshold I1 is a critical current value of the PID generated by the photovoltaic component measured according to the characteristics of the photovoltaic module; the second current threshold I2 is a preset human safety current value.
  • the resistor 11 can select a linear resistor, and the capacity can be calculated according to the limit of the ground leakage current of the photovoltaic DC grounding device provided by the present disclosure, generally not less than 30 k ⁇ K ⁇ .
  • the current measuring unit 12 may include a current sensor, a signal conversion circuit, and a transmission circuit.
  • the current sensor outputs a current signal to the signal conversion circuit and is transmitted to the on/off control unit 13 through the transmission circuit, wherein the current sensor may be Electromagnetic current transformers or electronic current transformers with an accuracy of milliamperes (mA).
  • the structure of the current measuring unit can take a variety of circuit configurations as is known in the art, and the examples provided herein are not intended to limit the scope of the disclosure.
  • the on/off control unit 13 may include all of the electronic, electrical, and control circuits that can be actuated according to a preset current threshold and a currently measured earth leakage current.
  • the on/off control unit 13 can be used as a single module or integrated with the current measuring unit 12 as an integral module.
  • the electronic and electrical components that perform the opening and closing operation may employ a current relay, a miniature circuit breaker, or the like.
  • the grounding of the photovoltaic DC grounding device provided by the present disclosure is controlled by the real-time earth leakage current value, the occurrence of PID and TCO corrosion is prevented, and the flexible control of the DC terminal negative ground is realized.
  • the long-term positive bias state of the photovoltaic component is avoided, which adversely affects the power generation efficiency of the photovoltaic component, thereby increasing the safety and reliability of the photovoltaic component system.
  • the photovoltaic DC grounding device provided by the present disclosure further includes: a current monitoring unit 14; and a current monitoring unit 14 connected to the current measuring unit 12, configured to display the measured ground leakage current in real time.
  • the current monitoring unit 14 is further configured to store the measured ground leakage current according to a preset time interval for subsequently providing raw data for analysis of changes in ground leakage current.
  • the current monitoring unit 14 may be composed of modules including storage, data processing, and display, and has a standard communication port, and can transmit data to other terminals through wire and/or wireless.
  • the real-time monitoring of the ground leakage current data realizes the visual observation of the working condition, facilitates the determination of the DC system failure, and facilitates the handling of the fault by the staff by storing the data. .
  • the photovoltaic DC grounding device provided by the present disclosure may be integrated in a plurality of photovoltaic DC devices, such as a combiner box, a combiner box, a distribution box, or an inverter.
  • the photovoltaic DC grounding device provided by the present disclosure is suitable for a DC system composed of components in which all photovoltaic effects generate electricity.

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Abstract

A photovoltaic direct current (DC) grounding device, comprising: a resistor (11) connected between a negative electrode PV- of a photovoltaic DC system and a current measuring unit (12); the current measuring unit, which is configured to measure an earth leakage current flowing through the photovoltaic DC grounding device; and a connect/disconnect control unit (13) configured to control the photovoltaic DC grounding device to connect with or disconnect from an earth protective earth (PE) according to the earth leakage current measured by the current measuring unit. By controlling the connection/disconnection of the grounding of the photovoltaic DC grounding device according to a real-time value of earth leakage current, said photovoltaic DC grounding device prevents potential induced degradation (PID) and transparent conductive oxide (TCO) corrosion, achieves flexible control in grounding a negative electrode of a DC terminal, avoids an adverse impact on the power generation efficiency of a photovoltaic assembly caused by the photovoltaic assembly being in a positive bias state for a long time, and therefore improves the safety and reliability of the photovoltaic assembly system.

Description

一种光伏直流接地装置Photovoltaic DC grounding device
交叉引用cross reference
本公开要求于2017年3月30日递交的中国专利申请第201720325013.5号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。The present disclosure claims priority to Chinese Patent Application No. JP-A No. No. No. No. No. No. No. No. No. No. No. No. No.
技术领域Technical field
本公开涉及光伏技术领域，尤指一种光伏直流接地装置。The present disclosure relates to the field of photovoltaic technology, and more particularly to a photovoltaic DC grounding device.
背景技术Background technique
目前，相关技术中的各类光伏组件实际运行中会受到潜在电势诱导衰减(PID，Potential Induced Degradation)的影响，部分薄膜光伏组件同时会受到薄膜电池导电层(TCO)腐蚀的影响，解决这类问题的通常的做法是在光伏组件的直流侧进行负极接地。At present, the actual operation of various types of photovoltaic modules in related technologies is affected by potential inductive degradation (PID), and some thin film photovoltaic modules are also affected by the corrosion of the thin film battery conductive layer (TCO). The usual practice of the problem is to ground the negative pole on the DC side of the PV module.
如果采用直接的负极接地，显然存在诸多安全隐患，比如要是此时如果光伏组件的正极因故障也接地了，会造成光伏组件正负极短路，从而引起设备烧毁、火灾等重大事故；而如果采用相关技术中的专用接地模块，虽然可以安全实现光伏系统直流端负极接地，但是，无法实现光伏组件在接地与不接地间切换。If a direct negative grounding is used, there are obviously many safety hazards. For example, if the positive pole of the photovoltaic module is grounded due to a fault at this time, the positive and negative poles of the photovoltaic module will be short-circuited, causing major accidents such as equipment burning and fire; The dedicated grounding module in the related art can safely realize the negative grounding of the DC terminal of the photovoltaic system, but the switching of the photovoltaic component between grounding and non-grounding cannot be realized.
发明内容Summary of the invention
为了解决上述技术问题，本公开提供了一种光伏直流接地装置，能够实现对直流端负极接地的灵活控制。In order to solve the above technical problem, the present disclosure provides a photovoltaic DC grounding device, which can realize flexible control of the DC grounding of the DC terminal.
为了达到本公开目的，本公开提供一种光伏直流接地装置，包括：连接于光伏直流系统的负极PV-与电流测量单元(12)之间的电阻(11)；设置为测量经过所述光伏直流接地装置的对地漏电流的电流测量单元(12)；以及，设置为根据电流测量单元(12)测量到的对地漏电流，控制所述光伏直流接地装置与大地PE的接通或断开的通断控制单元(13)。In order to achieve the objectives of the present disclosure, the present disclosure provides a photovoltaic DC grounding device comprising: a resistor (11) connected between a negative electrode PV- and a current measuring unit (12) of a photovoltaic direct current system; configured to measure through the photovoltaic direct current a current measuring unit (12) for ground leakage current of the grounding device; and, configured to control the on or off of the photovoltaic DC grounding device and the ground PE according to the ground leakage current measured by the current measuring unit (12) Break the control unit (13).
可选地，还包括：与所述电流测量单元(12)相连电流监控单元(14)，可设置为实时显示所述测量到的对地漏电流。Optionally, the method further includes: connecting the current monitoring unit (14) to the current measuring unit (12), and configured to display the measured ground leakage current in real time.
可选地，所述通断控制单元(13)可设置为：当所述测量到的对地漏电流小于预先设置的第一电流阈值I1时，断开所述光伏直流接地装置与大地的连接；当所述测量到的对地漏电流大于预先设置的第二电流阈值I2时，断开所述光伏直流接地装置与大地的连接；当所述测量到的对地漏电流大于或等于预先设置的第一电流阈值I1小于或等于预先设置的第二电流阈值I2时，接通所述光伏直流接地装置与大地的连接。Optionally, the on/off control unit (13) may be configured to: when the measured ground leakage current is less than a preset first current threshold I1, disconnect the photovoltaic DC grounding device from the ground; Disconnecting the photovoltaic DC grounding device from the ground when the measured ground leakage current is greater than a preset second current threshold I2; when the measured ground leakage current is greater than or equal to a preset first When the current threshold I1 is less than or equal to the preset second current threshold I2, the connection of the photovoltaic DC grounding device to the ground is turned on.
可选地，所述电阻(11)为线性电阻。Optionally, the resistor (11) is a linear resistor.
可选地，所述电阻(11)的阻值不小于30千欧KΩ。Optionally, the resistance of the resistor (11) is not less than 30 kΩ KΩ.
可选地，所述电流测量单元(12)包括电流传感器、信号转换电路、及传输电路。Optionally, the current measuring unit (12) comprises a current sensor, a signal conversion circuit, and a transmission circuit.
可选地，所述电流传感器为电磁式电流互感器，或者电子式电流互感器。Optionally, the current sensor is an electromagnetic current transformer, or an electronic current transformer.
可选地，所述电流传感器的精度为毫安mA级。Optionally, the current sensor has an accuracy of milliampere mA.
可选地，所述通断控制单元13包括根据电流进行开合动作的电子、电气元件及控制电路。Optionally, the on/off control unit 13 includes an electronic, electrical component, and control circuit that performs an opening and closing operation according to a current.
可选地，所述进行开合动作的电子、电气元件为电流继电器、或微型断路器。Optionally, the electronic and electrical components that perform the opening and closing operation are current relays or miniature circuit breakers.
本公开提供的方案包括：连接于光伏直流系统的负极PV-与电流测量单元之间的电阻；设置为测量经过本公开提供的光伏直流接地装置的对地漏电流的电流测量单元，以及设置为根据电流测量单元测量到的对地漏电流，控制本公开提供的光伏直流接地装置与大地PE的接通或断开的通断控制单元。通过本公开提供的光伏直流接地装置，通过实时对地漏电流数值控制本公开提供的光伏直流接地装置接地的通断，预防了PID及TCO腐蚀的发生，而且实现了对直流端负极接地的灵活控制，避免了光伏组件长期处于正偏压状态而对光伏组件的发电效率产生的不利影响，从而增加了光伏组件系统的安全性和可靠性。The solution provided by the present disclosure includes: a resistance connected between a negative electrode PV- and a current measuring unit of the photovoltaic direct current system; a current measuring unit configured to measure a ground leakage current of the photovoltaic direct current grounding device provided by the present disclosure, and configured to be The ground leakage current measured by the current measuring unit controls the on/off control unit of the photovoltaic DC grounding device and the ground PE provided or closed by the present disclosure. Through the photovoltaic DC grounding device provided by the present disclosure, the grounding of the photovoltaic DC grounding device provided by the present disclosure is controlled by the real-time earth leakage current value, the occurrence of PID and TCO corrosion is prevented, and the flexible control of the DC terminal negative ground is realized. The long-term positive bias state of the photovoltaic component is avoided, which adversely affects the power generation efficiency of the photovoltaic component, thereby increasing the safety and reliability of the photovoltaic component system.
在一实施例中地，本公开提供的光伏直流接地装置通过对地漏电流数据的实时监控，实现了对工作情况的可视化观察，便于判定直流系统故障，而且通过对数据的存储，还方便了工作人员对故障的处理。In an embodiment, the photovoltaic DC grounding device provided by the present disclosure realizes visual observation of the working condition by real-time monitoring of the ground leakage current data, facilitates determining the DC system failure, and facilitates the work by storing the data. The handling of faults by personnel.
本公开的其它特征和优点将在随后的说明书中阐述，并且，部分地从说明书中变得显而易见，或者通过实施本申请而了解。本公开的目的和其他优点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。Other features and advantages of the present disclosure will be set forth in the description which follows. The objectives and other advantages of the present disclosure can be realized and obtained by the structure particularly pointed out in the appended claims.
附图说明DRAWINGS
附图用来提供对本申请技术方案的在一实施例中理解，并且构成说明书的一部分，与本公开的实施例一起设置为解释本申请的技术方案，并不构成对本申请技术方案的限制。The drawings are intended to provide an understanding of the embodiments of the present application, and are to be construed as a part of the description of the present invention.
图1为本公开光伏直流接地装置的组成结构示意图。FIG. 1 is a schematic structural diagram of a photovoltaic DC grounding device according to the present disclosure.
具体实施方式detailed description
为使本公开的目的、技术方案和优点更加清楚明白，下文中将结合附图对本申请的实施例进行详细说明。需要说明的是，在不冲突的情况下，本公开中的实施例及实施例中的特征可以相互任意组合。In order to make the objects, technical solutions, and advantages of the present disclosure more apparent, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments in the present disclosure and the features in the embodiments may be arbitrarily combined with each other without conflict.
本公开发明人认为，一方面，一般情况下，光伏组件是不会出现PID或TCO腐蚀，也就是说，通常光伏组件是不需要负极接地的；另一方面，如果光伏组件长期处于正偏压状态即直流端负极接地后的状态，对于光伏组件的发电效率会产生不利影响。因此，本公开发明人提出一种光伏直流接地装置，能够实现对直流端负极接地的灵活控制，避免光伏组件长期处于正偏压状态。The inventor of the present disclosure believes that, on the one hand, in general, the PV module does not exhibit PID or TCO corrosion, that is, usually the PV module does not need to be grounded at the negative electrode; on the other hand, if the PV module is in a positive bias for a long time The state, that is, the state after the negative terminal of the DC terminal is grounded, adversely affects the power generation efficiency of the photovoltaic module. Therefore, the inventors of the present disclosure have proposed a photovoltaic DC grounding device, which can realize flexible control of the grounding of the negative terminal of the DC terminal, and avoid the long-term bias state of the photovoltaic component.
图1为本公开光伏直流接地装置的组成结构示意图，如图1所示，光伏直流接地装置1包括：电阻11、电流测量单元12、以及通断控制单元13；其中，电阻11的一端与光伏直流系统的负极PV-相连，电阻11的另一端与电流测量单元12相连；电流测量单元12，设置为测量经过本公开提供的光伏直流接地装置的对地漏电流。1 is a schematic structural diagram of a photovoltaic DC grounding device of the present disclosure. As shown in FIG. 1, the photovoltaic DC grounding device 1 includes: a resistor 11, a current measuring unit 12, and an on/off control unit 13; wherein one end of the resistor 11 and the photovoltaic The cathode of the DC system is PV-connected, and the other end of the resistor 11 is connected to the current measuring unit 12; the current measuring unit 12 is arranged to measure the ground leakage current through the photovoltaic DC grounding device provided by the present disclosure.
通断控制单元13，设置为根据电流测量单元12测量到的对地漏电流，控制本公开提供的光伏直流接地装置与大地PE的接通或断开。The on-off control unit 13 is arranged to control the on or off of the photovoltaic DC grounding device and the ground PE provided by the present disclosure according to the ground leakage current measured by the current measuring unit 12.
例如，当测量到的对地漏电流小于预先设置的第一电流阈值I1时，即判定出光伏组件未发生电势诱导衰减，断开本公开提供的光伏直流接地装置与大地的连接；当测量到的对地漏电流大于预先设置的第二电流阈值I2时，即判定出光伏组件漏电流会影响操作人员的安全，此时断开本公开提供的光伏直流接地装置与大地的连接；当测量到的对地漏电流大于或等于预先设置的第一电流阈值I1小于或等于预先设置的第二电流阈值I2时，接通本公开提供的光伏直流接地装置与大地的连接，光伏直流系统负极电位不低于0。For example, when the measured ground leakage current is less than the preset first current threshold I1, it is determined that the photovoltaic component does not have potential induced attenuation, and the connection of the photovoltaic DC grounding device provided by the present disclosure to the earth is disconnected; When the ground leakage current is greater than the preset second current threshold I2, it is determined that the photovoltaic module leakage current may affect the safety of the operator. At this time, the connection of the photovoltaic DC grounding device provided by the present disclosure to the earth is disconnected; when the measured pair is When the ground leakage current is greater than or equal to the preset first current threshold I1 is less than or equal to the preset second current threshold I2, the connection of the photovoltaic DC grounding device provided by the present disclosure to the ground is turned on, and the negative potential of the photovoltaic direct current system is not lower than 0. .
其中，第一电流阈值I1为根据光伏组件特性预先测算出的光伏组件发生PID的临界电流值；第二电流阈值I2为预先设置的人体安全电流值。The first current threshold I1 is a critical current value of the PID generated by the photovoltaic component measured according to the characteristics of the photovoltaic module; the second current threshold I2 is a preset human safety current value.
可选地，电阻11可以选择线性电阻，容量可以根据本公开提供的光伏直流接地装置对地漏电流限制计算得出，一般不小于30千欧KΩ。Optionally, the resistor 11 can select a linear resistor, and the capacity can be calculated according to the limit of the ground leakage current of the photovoltaic DC grounding device provided by the present disclosure, generally not less than 30 kΩ KΩ.
可选地，电流测量单元12可以包括电流传感器、信号转换电路、及传输电路等，电流传感器将电流信号输出给信号转换电路并通过传输电路传送给通断控制单元13，其中，电流传感器可以是电磁式电流互感器或电子式电流互感器，精度达到毫安(mA)级。电流测量单元的结构可以采用本领域习知的多种电路结构，此处提供的例子并不用于限定本公开的保护范围。Optionally, the current measuring unit 12 may include a current sensor, a signal conversion circuit, and a transmission circuit. The current sensor outputs a current signal to the signal conversion circuit and is transmitted to the on/off control unit 13 through the transmission circuit, wherein the current sensor may be Electromagnetic current transformers or electronic current transformers with an accuracy of milliamperes (mA). The structure of the current measuring unit can take a variety of circuit configurations as is known in the art, and the examples provided herein are not intended to limit the scope of the disclosure.
可选地，通断控制单元13可以包括所有可根据预先设置的电流阈值和当前测量到的对地漏电流进行开合动作的电子、电气元件及控制电路。Alternatively, the on/off control unit 13 may include all of the electronic, electrical, and control circuits that can be actuated according to a preset current threshold and a currently measured earth leakage current.
通断控制单元13可以独立作为一个模块，也可以与电流测量单元12集成为一个整体模块。当通断控制单元13独立存在时，进行开合动作的电子、电气元件可以采用电流继电器、微型断路器等。The on/off control unit 13 can be used as a single module or integrated with the current measuring unit 12 as an integral module. When the on/off control unit 13 is independently present, the electronic and electrical components that perform the opening and closing operation may employ a current relay, a miniature circuit breaker, or the like.
通过本公开提供的光伏直流接地装置，通过实时对地漏电流数值控制本公开提供的光伏直流接地装置接地的通断，预防了PID及TCO腐蚀的发生，而且实现了对直流端负极接地的灵活控制，避免了光伏组件长期处于正偏压状态而对光伏组件的发电效率产生的不利影响，从而增加了光伏组件系统的安全性和可靠性。Through the photovoltaic DC grounding device provided by the present disclosure, the grounding of the photovoltaic DC grounding device provided by the present disclosure is controlled by the real-time earth leakage current value, the occurrence of PID and TCO corrosion is prevented, and the flexible control of the DC terminal negative ground is realized. The long-term positive bias state of the photovoltaic component is avoided, which adversely affects the power generation efficiency of the photovoltaic component, thereby increasing the safety and reliability of the photovoltaic component system.
在一实施例中，本公开提供的光伏直流接地装置还包括：电流监控单元14；电流监控单元14，与电流测量单元12相连，设置为实时显示测量到的对地漏电流。In an embodiment, the photovoltaic DC grounding device provided by the present disclosure further includes: a current monitoring unit 14; and a current monitoring unit 14 connected to the current measuring unit 12, configured to display the measured ground leakage current in real time.
可选地，电流监控单元14，还设置为按照预先设置的时间间隔存储测量到的对地漏电流，以便后续为对地漏电流的变化情况的分析提供原始数据。Optionally, the current monitoring unit 14 is further configured to store the measured ground leakage current according to a preset time interval for subsequently providing raw data for analysis of changes in ground leakage current.
可选地，电流监控单元14可以包括存储、数据处理及显示等模块组成，并具有标准通讯端口，可以通过有线和/或无线方式与其他终端传输数据。Optionally, the current monitoring unit 14 may be composed of modules including storage, data processing, and display, and has a standard communication port, and can transmit data to other terminals through wire and/or wireless.
通过本公开提供的光伏直流接地装置，通过对地漏电流数据的实时监控，实现了对工作情况的可视化观察，便于判定直流系统故障，而且通过对数据的存储，还方便了工作人员对故障的处理。Through the photovoltaic DC grounding device provided by the present disclosure, the real-time monitoring of the ground leakage current data realizes the visual observation of the working condition, facilitates the determination of the DC system failure, and facilitates the handling of the fault by the staff by storing the data. .
本公开提供的光伏直流接地装置可以集成在多个光伏直流设备中，如汇流盒、汇流箱、 配电箱或逆变器中。The photovoltaic DC grounding device provided by the present disclosure may be integrated in a plurality of photovoltaic DC devices, such as a combiner box, a combiner box, a distribution box, or an inverter.
本公开提供的光伏直流接地装置，适设置为所有光生伏特效应产生电能的组件组成的直流系统。The photovoltaic DC grounding device provided by the present disclosure is suitable for a DC system composed of components in which all photovoltaic effects generate electricity.
虽然本公开所揭露的实施方式如上，但所述的内容仅为便于理解本申请而采用的实施方式，并非用以限定本申请。任何本公开所属领域内的技术人员，在不脱离本公开所揭露的精神和范围的前提下，可以在实施的形式及细节上进行任何的修改与变化，但本公开的专利保护范围，仍须以所附的权利要求书所界定的范围为准。The embodiments disclosed in the present disclosure are as described above, but the description is only for the purpose of understanding the present application, and is not intended to limit the present application. Any modification or variation in the form and details of the implementation may be made by those skilled in the art without departing from the spirit and scope of the disclosure. The scope defined by the appended claims shall prevail.

Claims (10)

  1. 一种光伏直流接地装置，包括：A photovoltaic DC grounding device comprising:
    连接于光伏直流系统的负极PV-与电流测量单元(12)之间的电阻(11)；a resistor (11) connected between the anode PV- of the photovoltaic DC system and the current measuring unit (12);
    设置为测量经过所述光伏直流接地装置的对地漏电流的电流测量单元(12)；以及，a current measuring unit (12) configured to measure a ground leakage current through the photovoltaic DC grounding device;
    设置为根据电流测量单元(12)测量到的对地漏电流，控制所述光伏直流接地装置与大地PE的接通或断开的通断控制单元(13)。The on/off control unit (13) is configured to control the on/off of the photovoltaic DC grounding device and the ground PE according to the ground leakage current measured by the current measuring unit (12).
  2. 根据权利要求1所述的光伏直流接地装置，其中，还包括：The photovoltaic DC grounding device of claim 1 further comprising:
    与所述电流测量单元(12)相连电流监控单元(14)，设置为实时显示所述测量到的对地漏电流。A current monitoring unit (14) is connected to the current measuring unit (12) and configured to display the measured ground leakage current in real time.
  3. 根据权利要求1或2所述的光伏直流接地装置，其中，所述通断控制单元(13)设置为：The photovoltaic DC grounding device according to claim 1 or 2, wherein the on/off control unit (13) is arranged to:
    当所述测量到的对地漏电流小于预先设置的第一电流阈值I1时，断开所述光伏直流接地装置与大地的连接；Disconnecting the photovoltaic DC grounding device from the ground when the measured ground leakage current is less than a preset first current threshold I1;
    当所述测量到的对地漏电流大于预先设置的第二电流阈值I2时，断开所述光伏直流接地装置与大地的连接；Disconnecting the photovoltaic DC grounding device from the ground when the measured ground leakage current is greater than a preset second current threshold I2;
    当所述测量到的对地漏电流大于或等于预先设置的第一电流阈值I1小于或等于预先设置的第二电流阈值I2时，接通所述光伏直流接地装置与大地的连接。When the measured ground leakage current is greater than or equal to the preset first current threshold I1 being less than or equal to the preset second current threshold I2, the connection of the photovoltaic DC grounding device to the ground is turned on.
  4. 根据权利要求1或2所述的光伏直流接地装置，其中，所述电阻(11)为线性电阻。The photovoltaic DC grounding device according to claim 1 or 2, wherein the resistor (11) is a linear resistor.
  5. 根据权利要求4所述的光伏直流接地装置，其中，所述电阻(11)的阻值不小于30千欧KΩ。The photovoltaic DC grounding device according to claim 4, wherein the resistance of the resistor (11) is not less than 30 kΩ KΩ.
  6. 根据权利要求1或2所述的光伏直流接地装置，其中，所述电流测量单元(12)包括电流传感器、信号转换电路、及传输电路。The photovoltaic DC grounding device according to claim 1 or 2, wherein the current measuring unit (12) comprises a current sensor, a signal conversion circuit, and a transmission circuit.
  7. 根据权利要求6所述的光伏直流接地装置，其中，所述电流传感器为电磁式电流互感器，或者电子式电流互感器。The photovoltaic DC grounding device according to claim 6, wherein the current sensor is an electromagnetic current transformer or an electronic current transformer.
  8. 根据权利要求6所述的光伏直流接地装置，其中，所述电流传感器的精度为毫安mA级。The photovoltaic DC grounding device of claim 6 wherein the current sensor has an accuracy of milliamps mA.
  9. 根据权利要求1或2所述的光伏直流接地装置，其中，所述通断控制单元13包括根据电流进行开合动作的电子、电气元件及控制电路。The photovoltaic DC grounding device according to claim 1 or 2, wherein the on/off control unit 13 includes an electronic component, an electric component, and a control circuit that perform an opening and closing operation according to a current.
  10. 根据权利要求9所述的光伏直流接地装置，其中，所述进行开合动作的电子、电气元件为电流继电器、或微型断路器。The photovoltaic DC grounding device according to claim 9, wherein the electronic or electrical component that performs the opening and closing operation is a current relay or a miniature circuit breaker.
PCT/CN2018/080954 2017-03-30 2018-03-28 Photovoltaic direct current grounding device WO2018177336A1 (en)

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CN206595959U (en) * 2017-03-30 2017-10-27 北京铂阳顶荣光伏科技有限公司 A kind of photovoltaic DC earthing or grounding means
CN108702968A (en) * 2018-07-26 2018-10-26 深圳市均益安联光伏系统工程有限责任公司 A kind of photovoltaic type plantation irradiation system and its control method
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CN206595959U (en) * 2017-03-30 2017-10-27 北京铂阳顶荣光伏科技有限公司 A kind of photovoltaic DC earthing or grounding means

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