Mixed DC closed-loop test system and implementation method

A hybrid DC and test system technology, applied in the field of hybrid DC closed-loop test systems, can solve problems such as commutation failure, and achieve the effect of simple operation
CN104914734AActive Publication Date: 2015-09-16ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
Publication Date
2015-09-16

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Abstract

The invention provides a mixed DC closed-loop test system and an implementation method. The system comprises a mixed DC real-time simulation system establishing a receiving end as a flexible direct current, and the mixed DC real-time simulation system is composed of a sending end which is a conventional direct current based on a thyristor half-controlled device, the receiving end which is the flexible direct current based on an IGBT full-controlled device, an AC system, an AC filter, an AC bus, an AC breaker, a large-step-length interface circuit connected with the conventional direct current, and a small-step-length interface circuit connected with the flexible direct current; and the closed-loop testing test system is formed through a real-time digital simulator simulation mixed DC system, an MMC simulation device simulating a modular multi-level converter, an MMC valve control device, an MMC unit control and protection device, an IO board card, a photoelectric conversion device, an LCC valve control device of the conventional direct current, an LCC unit control and protection device and a mixed DC system coordination control device. An effective test method is provided for control protection characteristic research of a mixed direct current and a closed-loop test of the mixed direct current, and operation is simple and convenient.
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Description

technical field

[0001] The patent of the present invention relates to DC transmission technology and its closed-loop test, in particular to a hybrid DC closed-loop test system in which the sending end is conventional DC and the receiving end is flexible DC, and its realization method. Background technique

[0002] In conventional HVDC transmission projects, Thyristor-based line-commutated converters (Line-Communicated Converters, LCCs) are widely used, especially for large-capacity, high-voltage, and long-distance power transmission occasions, but there is a commutation problem for receiving-end weak systems. The problem of failure. In recent years, with the development of wind power and other new energy sources, flexible direct current transmission technology has attracted the attention and engineering applications of more and more experts and scholars at home and abroad. Flexible DC adopts a modular multi-level converter (Voltage Source Converter, VSC) based on IGBT and o...

Claims

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