DC distribution network system internal overvoltage protection system and method
A technology of DC distribution network and protection system, which is applied in the direction of emergency protection circuit device for limiting overcurrent/overvoltage, DC network circuit device, electrical components, etc., and can solve the problem of damage to the insulation of electrical facilities and the lack of DC power distribution system , short-circuit ground fault and other issues, to achieve the effect of improving system operation reliability, optimal technical and economic efficiency, and effective protection
Active Publication Date: 2019-08-09
TSINGHUA UNIV
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Problems solved by technology
[0004] The overvoltage generated by the operation, cut-off, resonance and lightning strike of the power system is always threatening the insulation of electrical equipment and the safe operation of the power system. The intrusion of overvoltage will destroy the insulation of electrical facilities, cause short-circuit grounding faults, and even easily cause accidents. Large-scale power outages caused by expansion
At present, medium-voltage DC power distribution is a popular direction for the development of distribution networks, but there is currently a lack of effective solutions for overvoltage protection of DC power distribution systems. Establishing a reliable system for protection will play a positive role in the safety of power transmission and distribution equipment and the stability of power supply
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[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.
[0032] The invention discloses an internal overvoltage protection system and method of a DC distribution network system. The overvoltage is protected by adding a lightning arrester inside the DC distribution network system. The system includes a multi-port power electronic transformer equipped with a lightning arrester. High-voltage AC ports, medium-voltage DC ports of multi-port power electronic transformers, low-voltage AC ports of multi-port power electronic transformers, low-voltage DC ports of multi-port power electronic transformers, voltage source converters, and DC circuit breakers. The arrester in the system is configured according to the following princi...
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The invention discloses a DC distribution network system internal overvoltage protection method and a DC distribution network system internal overvoltage protection system constructed according to theprotection method. The method configures an arrester in a DC distribution network system according to the following principles of: 1) limiting the AC-side overvoltage by an AC-side arrester; 2) limiting the DC-side overvoltage by a DC-side arrester; and 3) directly protecting system key equipment by an arrester close thereto. The DC distribution network system internal overvoltage protection system constructed according to the protection method includes the medium-voltage AC port of a multi-port power electronic transformer equipped with an arrester, the medium-voltage DC port of the multi-port power electronic transformer, the low-voltage AC port of the multi-port power electronic transformer, the low-voltage DC port of the multi-port power electronic transformer, a voltage-source converter, and a DC circuit breaker.
Description
technical field [0001] The invention relates to the field of direct current power distribution, in particular to an internal overvoltage protection system and method of a direct current distribution network system. Background technique [0002] Overvoltage is divided into two categories: external overvoltage and internal overvoltage. External overvoltage, also known as lightning overvoltage and atmospheric overvoltage, is caused by the discharge of thunderclouds in the atmosphere to the ground. The duration of lightning overvoltage is about tens of microseconds, and it has the characteristics of pulse, so it is often called lightning shock wave. Direct lightning overvoltage is the overvoltage that occurs when lightning directly hits the conductive part of electrical equipment, and the amplitude of direct lightning overvoltage can reach millions of volts. Induced lightning overvoltage is the overvoltage induced on the electrical equipment (including secondary equipment and ...
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IPC IPC(8): H02H9/04H02J1/00
CPCH02H9/04H02J1/00
Inventor 余占清曾嵘屈鲁王晓蕊陈政宇张翔宇姚大伟
Owner TSINGHUA UNIV