Charging and discharging control device and control method for energy storage super-capacitor of electric workover rig

Abstract

The invention relates to a charging and discharging control device for an energy storage super-capacitor of an electric workover rig. A bidirectional DC / DC converter of the device is a non-isolation type DC / DC converter; a bidirectional DC / DC converter main circuit control device is arranged on a main circuit of the bidirectional DC / DC converter, and is connected with the main circuit of the bidirectional DC / DC converter; by control over on and off of the bidirectional DC / DC converter main circuit control device, out-of-control overcurrent of the main circuit of the bidirectional DC / DC converter is avoided. In actual application, the main circuit of the bidirectional DC / DC converter and the main circuit control device can meet the power requirement of the electric workover rig in a way of parallel connection of n circuits; according to the charging and discharging control device for the energy storage super-capacitor of the electric workover rig and the control method, uncontrollable factors and risk of damage of charging current of the super-capacitor to the bus side can be avoided, and safe and reliable operation of an electric control system of the electric workover rig can be guaranteed.

Description

technical field [0001] The invention relates to the field of power electronics technology, in particular to an energy storage supercapacitor charging and discharging control device and control method for an electric workover rig. Background technique [0002] Bidirectional DC voltage converter, also known as bidirectional DC / DC converter, is a kind of DC converter that can adjust the bidirectional transmission of energy according to the needs, that is, it converts the DC voltage supplied by the input terminal into a higher, lower or reverse voltage. To the voltage level of the DC voltage circuit. Conversion is performed using periodically operated electronic switches and one or more energy storage elements. In the field of electric energy, these converters are also called DC chopper controllers, and are used in DC uninterruptible power systems, aviation power systems, supercapacitor and battery energy storage systems, electric vehicles, hybrid energy vehicles, fuel cells an...

AI Technical Summary

Problems solved by technology

However, in practical applications, existing figure 2 The common outstanding problem of the bidirectional DC / DC converter shown is: when using the bidirectional DC / DC converter device, it must be ensured that the DC voltage on the bus side is higher than the DC voltage on the supercapacitor side, otherwise, when the bus side suddenly drops When the power is turned on, the supercapacitor side will immediately discharge to the bus side through the diode D2 of the IGBT switch tube VG2. The arc phenomenon cannot be disconnected, causing the "straight-through" phenomenon between the super capacitor side and the DC bus side of the energy storage device, causing the problem that the super capacitor charges the DC bus with an uncontrollable current, and there is a risk of causing damage to the circuit unit due to overcurrent

If a DC circuit breaker is used instead of DC contactors KM1 and KM2 and KM3 and KM4 for protection, on the one hand, its cost is too high; Tube VG2 has been damaged

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