Topological structure for soft start control of flexible direct current distribution network converter
A flexible DC and topology technology, applied in power transmission AC networks, output power conversion devices, electrical components, etc., can solve problems such as poor soft start control reliability, and achieve easy popularization and application, low topology cost, and enhanced reliability. Effect
Pending Publication Date: 2022-01-18
GUANGDONG POWER GRID CO LTD +1
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[0005] The purpose of this application is to provide a topological structure of soft-start control for flexible DC distribution network converters, which is used to solve the technical problem of poor reliability of soft-start control in the prior art
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[0037] The technical solutions of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0038] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, use a spec...
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The invention discloses a topological structure for soft start control of a flexible direct current distribution network converter, which comprises key components such as a time relay and a control relay, and adopts redundancy control logic of the time relay and the control relay, so that on one hand, soft start input time can be manually, automatically and flexibly adjusted, and on the other hand, reliable soft start switching can be ensured, the soft start input time can be flexibly adjusted, smooth soft start switching is ensured, and the reliability of system operation is enhanced. By adding a soft-start resistor energy judgment condition, when the soft-start resistor energy is greater than a set value, the control system directly trips off the incoming circuit breaker, so that the soft-start resistor is prevented from being damaged due to over-high energy. Therefore, the technical problem of poor soft start control reliability in the prior art is solved.
Description
Technical field [0001] The present application relates to the field of DC power transmission technology, and in particular to a topology structure for soft start control of a flexible DC distribution network converter. Background technique [0002] Currently, flexible DC distribution network converters limit overcurrent by adding a soft-start resistor, and after precharging is completed, the soft-start resistor is removed through a bypass circuit breaker. Since the soft-start resistor needs to be used to limit overcurrent, the soft-start resistor can easily be damaged due to the accumulation of thermal effects. Therefore, the soft-start resistor design needs to study different starting conditions and propose designs for the soft-start resistor resistance, starting time, adiabatic energy, etc. Require. [0003] Soft-start resistor switching is currently mainly performed by controlling relays, and the switching time is completely controlled by the background software. In this...
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Login to View More IPC IPC(8): H02M1/36H02J3/36
CPCH02M1/36H02J3/36Y02E60/60
Inventor 蔡仲启裴星宇陈建福唐捷曹安瑛陈勇杨锐雄李建标邹国惠刘尧何伟肖立军吴宏远周小艺侯成江霖陈滔程旭万新宇
Owner GUANGDONG POWER GRID CO LTD