CN104749474B - A kind of photovoltaic combining inverter GFCI Module Reliabilities detection means and method - Google Patents
A kind of photovoltaic combining inverter GFCI Module Reliabilities detection means and method Download PDFInfo
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Abstract
本发明公开一种光伏并网逆变器GFCI模块可靠性检测装置及方法，该装置是在光伏并网逆变器输出端对地漏电流检测模块GFCI中额外穿入两根带有继电器的导线，当继电器闭合时导线中电流大小相等方向相反。检测方法是基于两个继电器的断开或闭合来实施的，根据两个继电器的开关状态组合，设计四种检测状态以实现对GFCI模块的功能检测。该检测装置除了可以检测GFCI模块是否有故障外，也可以实现故障检测装置自身的检测，并且装置结构简单，工作频率低，对故障的判断精确，可靠性高。
The invention discloses a reliability detection device and method for a photovoltaic grid-connected inverter GFCI module. The device is to additionally penetrate two wires with relays into the ground leakage current detection module GFCI at the output end of the photovoltaic grid-connected inverter. When the relay is closed, the currents in the wires are equal in magnitude and opposite in direction. The detection method is implemented based on the opening or closing of two relays. According to the combination of the switching states of the two relays, four detection states are designed to realize the functional detection of the GFCI module. In addition to detecting whether the GFCI module has a fault, the detection device can also realize the detection of the fault detection device itself, and the device has a simple structure, low working frequency, accurate fault judgment and high reliability.
Description
技术领域technical field
本发明涉及一种光伏并网逆变器GFCI模块可靠性检测装置及方法，用来判断GFCI模块能否正常工作。The invention relates to a photovoltaic grid-connected inverter GFCI module reliability detection device and method, which are used to judge whether the GFCI module can work normally.
背景技术Background technique
对于光伏并网逆变器，接地故障电流漏电保护器(GFCI)是一个非常重要的模块，GFCI模块能否正常工作对保证逆变器稳定可靠运行及人身安全来说都非常重要。For photovoltaic grid-connected inverters, the ground fault current leakage protector (GFCI) is a very important module. Whether the GFCI module can work normally is very important to ensure the stable and reliable operation of the inverter and personal safety.
发明内容Contents of the invention
本发明公开一种光伏并网逆变器GFCI模块可靠性检测装置及方法，来保证单相光伏并网逆变器以及三相光伏并网逆变器稳定可靠运行。The invention discloses a photovoltaic grid-connected inverter GFCI module reliability detection device and method to ensure stable and reliable operation of single-phase photovoltaic grid-connected inverters and three-phase photovoltaic grid-connected inverters.
本发明解决所述技术问题的方案是：The scheme that the present invention solves described technical problem is:
一种光伏并网逆变器GFCI模块可靠性检测装置，该装置包括一个低压直流电源、两个继电器、两个阻值相等的电阻、导线，该装置是在光伏并网逆变器输出端对地漏电流检测模块GFCI中穿入两根带有继电器的导线，低压直流电源正极并联两个继电器，再通过两根导线穿入GFCI模块线圈后分别串联电阻，最后接至直流电源负极，两根导线穿入GFCI模块线圈方向相反。A photovoltaic grid-connected inverter GFCI module reliability detection device, the device includes a low-voltage DC power supply, two relays, two resistors with equal resistance, and wires, the device is connected to the output terminal of the photovoltaic grid-connected inverter The ground leakage current detection module GFCI penetrates two wires with relays, the positive pole of the low-voltage DC power supply is connected in parallel with two relays, and then the two wires are penetrated into the coil of the GFCI module, and the resistors are connected in series respectively, and finally connected to the negative pole of the DC power supply. Thread the coils into the GFCI module in the opposite direction.
本发明还提供了一种运用光伏并网逆变器GFCI模块可靠性检测装置的检测方法，该检测方法是基于两个继电器的断开或闭合来实施的，两个继电器的开关组合共有四种检测状态，将每一检测状态下的GFCI模块采样电流与已知模拟漏电流进行比较，以实现对GFCI模块的功能检测，对GFCI模块进行故障判断是在逆变器并网之前进行的。The present invention also provides a detection method using a photovoltaic grid-connected inverter GFCI module reliability detection device. The detection method is implemented based on the opening or closing of two relays. There are four types of switch combinations of the two relays. In the detection state, the sampling current of the GFCI module in each detection state is compared with the known analog leakage current to realize the functional detection of the GFCI module. The fault judgment of the GFCI module is carried out before the inverter is connected to the grid.
本发明的有益效果是，该检测装置除了可以检测GFCI模块是否有故障外，也可以实现故障检测装置自身的检测，本发明可以使GFCI模块对故障的判断更加精确。该可靠性检测装置不仅适用于单相光伏并网逆变器GFCI模块，也适用于三相光伏并网逆变器GFCI模块。由于GFCI模块可靠性检测装置结构简单，元器件很少，两个继电器只需在开机之前进行一次闭合和关断操作，工作频率很低，GFCI模块故障检测装置的可靠性很高。The beneficial effect of the present invention is that the detection device can not only detect whether the GFCI module is faulty, but also realize the detection of the fault detection device itself, and the present invention can make the fault judgment of the GFCI module more accurate. The reliability detection device is not only applicable to the GFCI module of the single-phase photovoltaic grid-connected inverter, but also applicable to the GFCI module of the three-phase photovoltaic grid-connected inverter. Since the GFCI module reliability detection device has a simple structure and few components, the two relays only need to be closed and closed once before starting up, and the operating frequency is very low, so the reliability of the GFCI module fault detection device is very high.
附图说明Description of drawings
图1是GFCI模块可靠性检测装置示意图。Figure 1 is a schematic diagram of a GFCI module reliability testing device.
附图中L、N分别表示市电的火线和零线，Relay1、Relay2表示继电器，R表示固定阻值的电阻，Vcc表示低压直流电源正极，Gnd表示低压直流电源负极，GFCI表示接地故障电流漏电保护器。图中的黑点表示交叉线之间相互连接；图中的箭头表示继电器闭合时电流的流向。In the attached drawings, L and N represent the live wire and neutral wire of the mains respectively, Relay1 and Relay2 represent relays, R represents a resistor with fixed resistance, Vcc represents the positive pole of the low-voltage DC power supply, Gnd represents the negative pole of the low-voltage DC power supply, and GFCI represents the ground fault current leakage protector. The black dots in the figure indicate the interconnection between the crossing wires; the arrows in the figure indicate the flow of current when the relay is closed.
具体实施方式detailed description
在并网逆变器GFCI侦测线圈中除了穿入市电火线和零线导线外，额外穿入两个电流流向相反的导线，当继电器Relay1闭合时流过GFCI侦测线圈的电流和继电器Relay2闭合时流过GFCI侦测线圈的电流大小相等方向相反。In the GFCI detection coil of the grid-connected inverter, in addition to passing through the live wire and the neutral wire of the mains, two additional wires with opposite current flow are inserted. When the relay Relay1 is closed, the current flowing through the GFCI detection coil and the relay Relay2 are closed. At the same time, the current flowing through the GFCI detection coil is equal in magnitude and opposite in direction.
光伏逆变器并网时，可靠性检测装置结束检测。检测方法是基于两个继电器的断开或闭合来实施的，共有四种检测状态：1、继电器Relay1和继电器Relay2都没有闭合，市电火线和零线上也没有电流流过，GFCI模块此时侦测的电流应该为零；2、当Relay1闭合，Relay2断开时，GFCI线圈中就产生了一个幅值为VCC/R的模拟电流，通过比较GFCI模块的采样电流值和VCC/R值，就可以判断出GFCI模块侦测一个方向的漏电流是否准确；3、当Relay1断开，Relay2闭合时，GFCI线圈中会产生了一个幅值为VCC/R的模拟电流，但此时模拟电流流入GFCI线圈的方向与检测状态2的电流方向相反，通过比较GFCI模块的采样电流值和VCC/R值，可以判断出GFCI模块侦测另一个方向的漏电流是否准确；4、当Relay1闭合，Relay2也闭合时，GFCI线圈中就产生了两个幅值为VCC/R但方向相反的模拟电流，此时GFCI模块的采样电流值应该和检测状态1完全相同。When the photovoltaic inverter is connected to the grid, the reliability detection device ends the detection. The detection method is implemented based on the opening or closing of the two relays. There are four detection states: 1. Both the relay Relay1 and the relay Relay2 are not closed, and there is no current flowing through the mains live wire and the neutral wire. The GFCI module is now The detected current should be zero; 2. When Relay1 is closed and Relay2 is disconnected, an analog current with an amplitude of V CC /R will be generated in the GFCI coil. By comparing the sampling current value of the GFCI module with V CC /R value, you can judge whether the GFCI module detects the leakage current in one direction accurately; 3. When Relay1 is disconnected and Relay2 is closed, an analog current with an amplitude of V CC /R will be generated in the GFCI coil, but at this time The direction of the analog current flowing into the GFCI coil is opposite to the current direction of the detection state 2. By comparing the sampling current value of the GFCI module with the V CC /R value, it can be judged whether the GFCI module detects the leakage current in the other direction accurately; 4. When When Relay1 is closed and Relay2 is also closed, two analog currents with the amplitude of V CC /R but opposite directions will be generated in the GFCI coil. At this time, the sampling current value of the GFCI module should be exactly the same as that of the detection state 1.
可见，GFCI模块若有故障，并网逆变器开机并网之前就能被检测出来。可靠性检测装置包括两个继电器、两个阻值相同的电阻和一个低压直流电源，当这几个元器件出现故障时，依照上述检测方法，故障也会被检测出来，是以GFCI故障的形式出现的。It can be seen that if there is a fault in the GFCI module, it can be detected before the grid-connected inverter is powered on and connected to the grid. The reliability detection device includes two relays, two resistors with the same resistance and a low-voltage DC power supply. When these components fail, according to the above detection method, the fault will also be detected in the form of a GFCI fault. appeared.
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