Alternating-current dual-power switching method
A technology of dual power switching and AC power, which is applied in the direction of emergency power arrangement, electrical components, circuit devices, etc., can solve problems such as power failure accidents, and achieve the effect of avoiding misoperation
Active Publication Date: 2014-10-08
XUCHANG XUJI JINGRUI TECH
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[0012] The purpose of the present invention is to provide a method for switching AC dual power sources to solve the problem of unnecessary power outages caused by switching power sources based on the current detection of incoming power sources
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[0037] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0038] In this embodiment, a dual power supply in a water-cooling system of a direct current transmission converter valve is taken as an example for illustration. Due to the importance of the water-cooling control system of the DC transmission converter valve, the PLC control system, the I / O module and the power supply system all adopt a dual design to improve the reliability of the water-cooling system, such as image 3 shown. The CPU of the water-cooling control system of the converter valve adopts the high-performance S7-400H series. During normal operation, one CPU is the master and the other is in the hot standby state. The two CPU configuration synchronization templates are connected through an optical cable to realize CPU hardware redundancy. S7-400H adopts the active redundancy principle of hot standby mode, and can automatically s...
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The invention relates to an alternating-current dual-power switching method, and belongs to the technical field of direct-current transmission. Two three-phase power detection elements KVM 1 and KVM 2 are arranged on an alternating-current dual-power bus, and the states of the alternating-current power detection elements KVM 1 and KVM 2 on the bus and the state of a power detection element KV 1 or KV 2 on one path of alternating-current power inlet wire in an input state are detected; if the states of any two elements in the three elements are 1, it is considered that the bus is electrified, and the input of the current path of inlet wire power is kept. If the states of any two elements in the three elements are 0, the other path of inlet wire power is switched to. The method carries out switching control in the mode with alternating-current bus voltage detection as the primary thing and inlet wire voltage detection as the secondary thing, the two-out-of-three principle is adopted in a logic control element, and the maloperation, caused by faults of individual elements, of a switching device is effectively avoided.
Description
technical field [0001] The invention relates to an AC dual power supply switching method, which belongs to the technical field of direct current transmission. Background technique [0002] High-voltage direct current transmission (HVDC) has the advantages of ultra-long-distance and large-capacity transmission, low cost, and low loss. It is currently widely used in my country and other countries. The converter valve is the core equipment of DC transmission, and the high-voltage and high-power thyristor is the core equipment component of the converter valve, which is responsible for the transmission of high-power electric energy from rectification (sending end) and inverter (receiving end). At the same time, electric energy itself will generate a large power loss and generate a large amount of heat. Reliable cooling equipment is needed for cooling, so that the converter valve and DC transmission system can operate stably. As the most effective cooling method for converter val...
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Inventor 姚为正景兆杰郑安邦刘长运马根坡于敏华李云龙廖杨
Owner XUCHANG XUJI JINGRUI TECH