A power quality control device of a transmission line and a control method thereof
A technology of power quality and transmission lines, applied in the direction of circuit devices, AC network circuits, electrical components, etc., can solve the problems of high cost of transmission line structure and maintenance costs, and achieve the effect of reflecting economy
Active Publication Date: 2018-12-18
GUANGDONG POWER GRID CO LTD +1
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AI Technical Summary
Problems solved by technology
[0003]
Usually, the failure of the power grid or substation facilities or the sudden large change of the load (such as the start-up of high-power equipment, etc.) will cause a voltage sag on the transmission line. The existing technology usually uses a voltage sag compensation device to deal with the voltage sag. Problem, however, existing voltage sag compensation devices such as series energy storage compensation devices, parallel energy storage compensation devices, and uninterruptible power supply devices all require additional energy storage equipment, resulting in higher construction costs and maintenance costs for transmission lines
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Embodiment Construction
[0027] Embodiments of the present invention provide a power quality control device for a transmission line and a control method thereof, which can temporarily compensate the voltage of the transmission line without an energy storage device.
[0028] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the following The described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0029] see figure 1 , an embodiment of a power quality control device for a power transmission l...
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The invention provides a power quality control device of a transmission line and a control method thereof. The device comprises a first converter, a second converter, a fast switch and a control terminal. The first converter and the second converter are connected back-to-back, and the control terminals with the preset control strategy are respectively connected with the first converter, the secondconverter and the fast switch. The output terminal of the second converter is connected with the bus bar of the main power supply, and the output terminal of the first converter is connected with thebus bar of the standby power supply. The control terminal is used for disconnecting the main power supply by controlling the state of the fast switch, the mode of the first converter and the mode ofthe second converter after detecting the voltage sag of the bus bar of the main power supply, and temporarily compensating the voltage by the standby power supply. The control terminal is used for controlling the state of the fast switch, the mode of the first converter and the mode of the second converter. The invention can temporarily compensate the voltage of the transmission line without the energy storage device.
Description
technical field [0001] The invention relates to the technical field of power quality control, in particular to a power quality control device and a control method for power transmission lines. Background technique [0002] As an economical, practical, clean and convenient energy, electric energy has become an important basis for economic development and people's lives. With the application of power electronic equipment more and more widely, various non-linear, impact, fluctuation and asymmetrical loads increase greatly, these problems will cause such as voltage imbalance, voltage sag, harmonics, low power factor, Power quality problems such as large negative sequence current content. [0003] Usually, the failure of the power grid or substation facilities or the sudden large change of the load (such as the start-up of high-power equipment, etc.) will cause the voltage sag on the transmission line. The existing technology usually uses the voltage sag compensation device to s...
Claims
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IPC IPC(8): H02J3/16H02J3/18
CPCH02J3/16H02J3/1842Y02E40/30Y02E40/40
Inventor 马明梁晓兵王涛徐柏榆刘军王玲雷二涛
Owner GUANGDONG POWER GRID CO LTD