Insulation detection system and method for super-capacitor energy storage system

Abstract

The invention provides an insulation detection system for a super-capacitor energy storage system. The system not only can realize insulation detection, but also can effectively improve the insulationdetection efficiency, and is good in safety, low in cost and high in practicability; and in addition, the invention further provides an insulation detection method for the super-capacitor energy storage system. The insulation detection system for the super capacitor energy storage system comprises an MCU control module, a detection module, a sampling module and a conversion module, wherein the MCU control module and the sampling module are electrically connected with the detection module, and the sampling module is connected with the MCU control module through the conversion module; the MCU control module is used for outputting PWM waves to the detection module so as to control the detection module to perform detection; the detection module is used for realizing insulation resistance detection of the insulation detection system; the sampling module is used for sampling the voltage signal of the detection module in real time; and the conversion module is used for receiving the data signals acquired and output by the sampling module, converting the data signals into digital signals and transmitting the digital signals to the MCU control module.

Description

technical field [0001] The invention relates to the technical field of urban rail transit, in particular to an insulation detection system for a supercapacitor energy storage system and a method thereof. Background technique [0002] In recent years, urban rail transit has become the mainstream of urban transportation development in my country due to its advantages of large passenger capacity, high-speed punctuality, good comfort, space saving and low pollution. In the next few years, the national investment in urban rail transit will approach 4 trillion yuan, the healthy development of the urban rail transit industry still needs the strong support of core equipment and technology. At present, the energy storage equipment in the field of urban rail transit mostly adopts the supercapacitor energy storage system solution based on the demand for space-time energy conversion. It is mainly used in the braking energy storage recovery of subways and the on-board energy storage of tr...

AI Technical Summary

Problems solved by technology

At present, the energy storage equipment in the field of urban rail transit mostly adopts the supercapacitor energy storage system solution based on the demand for space-time energy conversion. It is mainly used in the braking energy storage recovery of subways and the on-board energy storage of trams. Both applications require The energy storage equipment has an accurate and effective online insulation detection function; taking the insulation detection of the outermost device of the vehicle-mounted supercapacitor energy storage device as an example, the vehicle-mounted energy storage system needs to perform real-time insulation detection on the supercapacitor energy storage device itself, and uses insulation resistance The resistance value is used to measure the insulation state. Under normal operating conditions, the positive and negative DC power supply busbars are completely insulated from the supercapacitor module shell, but it is not ruled out that the vehicle body will be electrified due to the aging of the high-voltage line or the insulation reduction caused by moisture after long-term vehicle operation. Moreover, the working conditions of the vehicle are complex. Factors such as vibration, sharp changes in temperature and humidity, and corrosion of acid-base gases will cause damage to the insulation layer and reduce the insulation performance. Real-time monitoring of the insulation performance is of great significance to ensure personal safety and safe operation of the vehicle.

[0003] Based on this, for the insulation detection method, the current domestic mainstream supercapacitor energy storage system manufacturers mostly use the single-pole-to-ground insulation detection method in the field of electric vehicles or the H-bridge detection method with switches connected in series. Although this detection method is relatively low in standard , but the actual false alarm rate is high; in addition, some manufacturers adopt the fixed resistance access voltage divider method, sample the divided voltage value, and compare it with the fixed predicted state to realize the insulation resistance analysis, but this kind of measurement system is not flexible, and different capacities need to be changed Only hardware can be used; some manufacturers also use a balanced bridge detection method consisting of a relay or a single switch tube plus an adjustable resistor, and solve the insulation resistance through simultaneous equations. , the detection will be different from the actual situation, and the relay responds slowly, the adjustable resistor has practical problems such as the inability to automatically adapt, and there are defects in life and cost, and the practicability is limited

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