Active modular converter chain, converter control method and device, and electronic equipment

Abstract

The present application provides an active modularized converter chain control method, including calculating the maximum active power output by the converter chain according to the number of the energy storage sub-modules and the number of the non-energy storage sub-modules; Correcting the received active power command according to the maximum active power value to obtain an active power correction command; correcting the received reactive power command according to the active power correction command to obtain a reactive power correction command; the control system converts the received reactive power command The active power correction command is distributed to the energy storage converter chain, and the reactive power correction command is distributed to the non-energy storage converter chain and the energy storage converter chain; the energy storage converter chain according to The distributed active power correction command and reactive power correction command execute closed-loop control; the non-energy storage commutation chain executes closed-loop control according to the distributed reactive power correction command. The power command is corrected according to the output power capability of the converter chain to avoid the control target from exceeding the operating range and improve reliability.

Description

technical field [0001] The present application relates to the technical field of high-power power electronic conversion, and specifically relates to an active modularized converter chain control method and control device, a converter control method and control device, and electronic equipment. Background technique [0002] In the field of high-capacity and high-power power electronic conversion technology, multi-level converters use modular cascading technology to integrate energy storage devices into sub-modules, which have high modularity, good harmonic characteristics, and equivalent switching frequency. It has become the standard topology in the field of high-voltage power electronics. By integrating the energy storage unit as a sub-module in a modular multilevel converter, AC-DC power conversion and energy storage can be realized simultaneously. [0003] The resulting active modular converter is a feasible solution that can effectively meet the access requirements of e...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the single-phase power control method of the hybrid unit cascaded H-bridge energy storage system introduces the control concept of the capacitor sub-module and the energy storage sub-module, and analyzes the vector diagram of the system operation, but ignores various types of sub-modules. The number of modules will change dynamically, and the adjustment capacity of active power and reactive power of the converter chain will also change with the change of the number

In this case, when the commutation link receives the control command, it may not be able to execute according to the command due to the limitation of power regulation capability

If the original instructions are still executed, it will lead to a series of problems such as system control instability.

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