A ferromagnetic resonance detection and suppression device for a large-scale photovoltaic power station

Abstract

The invention discloses a ferromagnetic resonance detection and inhibition device for a large photovoltaic power station. The ferromagnetic resonance detection and inhibition device comprises an electromagnetic voltage transformer, a sampling voltage regulation module, a data processing module, a control system module and a switching value output module, wherein the sampling voltage regulation module, the data processing module, the control system module and the switching value output module are sequentially connected; an open triangle position of the electromagnetic voltage transformer is connected with a damping resistor; the switching value output module is also connected with a fling-cut switch; and the fling-cut switch is connected with the damping resistor. According to the ferromagnetic resonance detection and inhibition device, whether resonance occurs or not is judged through carrying out sampling conditioning on secondary side voltage of PT and analyzing voltage data of a power distribution network. If the resonance occurs, a control signal is output to drive a switch action of a contactor through communicating with an ARM chip, thereby achieving effective switching of the damping resistor to complete inhibition of ferromagnetic resonance; and resonance information is displayed to an LCD screen, stored into an SD card and uploaded to an upper computer. The ferromagnetic resonance detection and inhibition device has the advantages of being high in response speed, low in cost, low in power consumption and reliable in operation.

Description

technical field [0001] The invention relates to a ferromagnetic resonance detection and suppression device, especially a large-scale photovoltaic power station ferromagnetic resonance detection and suppression device based on DSP+ARM (DigitalSignal Processor + Advanced RISC Machines) structure. The invention belongs to new energy distribution power generation and transmission technology. Background technique [0002] At present, due to the limitation of equipment manufacturing technology and operating cost and other factors, in the 35kV neutral point ungrounded distribution network system, the traditional electromagnetic voltage transformer (PT) is still widely used on the substation bus to monitor electrical equipment insulation state. During normal operation, the three-phase voltage is basically balanced, and the displacement voltage of the neutral point is very small. However, during the transient conversion of electromagnetic energy caused by some switching operations ...

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Problems solved by technology

However, the operation mode of the photovoltaic power station is flexible. When the line is switched, the capacitive current of the system will often be changed, thereby affecting the tuning method of the arc suppression coil, resulting in the inability to effectively extinguish the arc.

[0004] In the context of large-scale photovoltaic penetration, not only the risk of resonant overvoltage in the distribution network has been exacerbated, accidents such as voltage transformer high-voltage fuse blown, exploded, and even directly burned have occurred from time to time; and the causes of such accidents have become more complicated

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