Network disconnection protection strategy for distributed control system of modular multilevel converter
A modular multi-level, distributed control technology, applied in electrical components, output power conversion devices, etc., can solve problems such as capacitor voltage soaring, overall system instability, inability to receive control data, etc., to achieve reasonable protection, The effect of reducing the impact
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[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. In the present invention, by storing the target output current phase sent by the main control, the sub-controller after disconnection can still continue to generate the modulation signal with the fundamental frequency AC component with basically correct phase; The capacitor voltage of the network sub-module is effectively controlled; a complete network disconnection protection strategy is proposed, and reasonable solutions are given for long-term and short-term network disconnection faults.
[0025] After the sub-controller is disconnected from the network, it cannot receive the control information from the main controller, and can only detect the capacitor voltage of the controlled sub-module through the voltage sensor.
[0026] The network disconnection protection strategy proposed in this patent is as follows: under normal circumstan...
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