Experimental system and method for MMC (multilevel modular converter) flexible direct-current transmission control protection equipment

Abstract

The invention discloses an experimental system for MMC (multilevel modular converter) flexible direct-current transmission control protection equipment. The experimental system comprises a real-time digital simulator, a valve-base control electronic device of a multilevel modular converter, and a control protection device of the multilevel modular converter. The real-time digital simulator is connected with the valve-base control electronic device through optical fiber. The real-time digital simulator is connected with the control protection device through optical fiber or a cable. The control protection device is connected with the valve-base control electronic device through optical fiber or a cable. The experimental system is used for closed-loop testing on control performance, protection configuration and functions of the MMC flexible direct-current transmission control protection equipment, and can also be used for function test on valve control equipment. When a system topology changes or primary system parameters are corrected, testing is conveniently achieved by correcting a simulation model. The invention further discloses an experimental method of the experimental system for MMC flexible direct-current transmission control protection equipment.

Description

technical field [0001] The invention belongs to the field of modularized multilevel flexible direct current transmission, and in particular relates to an experimental system and an experimental method for modularized multilevel flexible direct current transmission control and protection equipment. Background technique [0002] Flexible DC transmission is a method of using IGBT (Insulated Gate Bipolar Transistor) fully controlled devices to form a voltage source converter valve for DC transmission, and the converter is composed of a modular multi-level (MMC, Multi-level modular Converter) method. Flow valve is one of them, see J.DORH, H.HUANG, D.RETZMANN.A new Multilevel Voltage-sourced converter Topology for HVDC Applications[C], Cigre Symposium Paris2008, France. Figure 1 is a topology diagram of a modular multilevel converter. The figure shows the complete structure of three-phase six bridge arms. Each bridge arm in the figure is composed of multiple half-bridge sub-module...

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Problems solved by technology

[0010] (2) The control strategy of the control and protection equipment needs to be adjusted frequently according to the site requirements. After the adjustment, it needs to be tested on site for a short time before being put into on-site operation. Sometimes even after the strategy is adjusted, it is difficult to verify due to condition restrictions;

[0011] (3) The protection strategy involving sub-modules in the valve base control electronic equipment is difficult to verify on site;

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