On-line detection system for photovoltaic square array to ground insulation resistance of high-power photovoltaic inverter
A photovoltaic inverter, photovoltaic square array technology, applied in photovoltaic system monitoring, impedance measurement, photovoltaic power generation and other directions, can solve the problems of inaccuracy and inflexible measurement, achieve a wide range of applications, good versatility, low loss Effect
Active Publication Date: 2017-01-25
武汉武新电气科技股份有限公司
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[0004] The purpose of the embodiments of the present invention is to provide an on-line detection system for the insulation resistance of photovoltaic square arrays to ground of high-power photovoltaic inverters, so as to solve the problem of inflexible or inaccurate measurement in the prior art
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[0049] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0050] In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.
[0051] like figure 1 Shown is a circuit schematic diagram of a photovoltaic array-to-ground insulation resistance online detection system for a high-power photovoltaic inverter provided by the present invention. In the system:
[0052] Photovoltaic square array positive busbar PV+ and resistance R 1 Connected at one end, the resistor R 1 The other end is connected to the first MOSFET tube Q 1 The drain of the first MOSFET Q 1 The source is connected to the ground PG...
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The invention provides a photovoltaic square array of a high -power photovoltaic inverter for the online insulation impedance online detection system. The photovoltaic matrix positive parent line PV+is connected to one end of the resistor R1.Extreme, the source of the first MOSFET tube Q1 is connected to the earth PGND, which is also connected between the drainage and the source of the first MOSFET tube Q1;Connected, the other end of the resistor R2 is connected to the source of the second MOSFET tube Q2, which is connected to the earth PGND of the second MOSFET tube Q2.There is a resistance R4; the driver control terminal of the first MOSFET tube Q1 is connected to the first optocoupler drive circuit in which the driver control terminal of the second MOSFET tube Q2 is connected to the second optocoupler drive circuit;The PGND end, R2 ends, and PV‑ and PGND are connected to the first voltage sampling circuit, the second voltage sampling circuit, the third voltage sampling circuit, and the fourth voltage sampling circuit, respectively.The response is fast, the loss is small, and the application range is wider.
Description
technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and in particular relates to an on-line detection system for the ground insulation impedance of a photovoltaic square array of a high-power photovoltaic inverter. Background technique [0002] In high-power photovoltaic grid-connected inverters, the input voltage, that is, the voltage of the photovoltaic square array is relatively high, such as 500kW photovoltaic grid-connected inverters can be as high as 1000V. At the same time, in the photovoltaic power generation system, the on-site photovoltaic modules are affected by the sun, dust, rain, lightning strikes, construction transformation, etc., and the battery modules and their connecting cables may have problems such as aging and insulation resistance drop during long-term operation. Considering the electrical safety of power facilities, too small insulation resistance may cause the DC system to discharge to the ground; P...
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IPC IPC(8): H02S50/10G01R27/18
CPCH02S50/00Y02E10/50
Inventor 孙林波杜小刚熊滔刘良成
Owner 武汉武新电气科技股份有限公司