Abstract
High-power switching devices in control power supply have different saturated forward voltage drops and the inconsistency of turning on/off times and they lead to the inconsistency in the external characteristics of the inverter modules in parallel operation. Modules with good performance in external characteristics undertake more currents and lead to overloading status and modules with bad performance in external characteristics stay in light-loading status, which increases the thermal stress of module undertaking more currents and influences the service life of high-power switching devices. Based on the simulation analysis of the small-signal module using control power supply automatic current sharing method, it is able to find out the characteristics of current-sharing loop control, namely, slow response speed of the current-sharing loop, which is beneficial for improving the stability of the entire control power supply system.
Highlights
Control power supply mainly provides power supply for secondary system automatic equipment such as smart power substation control, monitoring, protection, signal and adjustment, etc. and it enjoys the reputation as "heart" of the power operation system
If abnormal operation or malfunction occurs to the control power supply, computer monitoring equipment, network communication equipment, intelligent protection and adjustment equipment in the substation will suffer from abnormal operation or power failure and the power grid will be running in the status free from protection and surveillance
Once accidents happen to the power grid, relay protection will refuse to act or no selective act will be made, which will cause the widespread blackout and major economic losses
Summary
Control power supply usually uses high-power, intellectualized and high-frequency switching power supply as its rectifier module and as its core circuit -- "inverter bridge" is composed of highpower switching devices. In order to elevate the output power of the rectifier module, it usually uses multiple inverter bridges in serial connection in operation, which. [6] speaking: current sharing precision is too low in output impedance method; it is unable to realize redundancy technique and it fails to well guarantee the reliability of the parallel power supply module system through adopting master-slave control method and automatic current sharing method based on average current value; external current sharing controller method makes system become more complicated and it is not beneficial for converting the technique to practical product. No module is preset manually as the main module and they are sequenced according to the size of current value, namely, module with larger current value automatically becomes the master module It is called "automatic current sharing method"
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