Load voltage-regulating method and device for all-thyristor non-transient transformer
A technology of voltage regulating device and thyristor, which is applied in the direction of conversion equipment that can be converted to direct current without intermediate conversion, and can solve the problems of infrequent operation, internal circulation of large transformers, and slow adjustment speed of mechanical tap changers, etc., to achieve operation easy effect
Inactive Publication Date: 2003-02-05
WUHAN UNIV
View PDF0 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
In addition, the adjustment speed of the mechanical tap changer is slow, and it cannot be operated frequently, let alone automatically adjusted by tracking the change of the line load voltage.
When multiple on-load tap changer transformers are running in parallel, it is very easy to form a large internal circulation of the transformer due to the difficulty of synchronizing the switching of the mechanical switches.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0040] The working principle of the present invention will be further described below in conjunction with the drawings and embodiments.
[0041] like figure 1 As shown, the voltage and current of bus 1 are converted into standard 100V voltage and standard 1A (5A) current by voltage transformer 2 and current transformer 3, and then sent to the on-load voltage regulating device 4 of the all-thyristor non-transient transformer. The full thyristor non-transient transformer on-load voltage regulating device 4 samples the voltage, processes the data, and obtains the actual voltage value U after calculation X , the actual voltage value U X with voltage standard value U R Compare and calculate the voltage deviation (positive or negative), as the thyristor tap changer S in the thyristor tap changer group 4.6 i (i=1, 2, . . . n) Criteria for closing or opening. Corresponding to closed thyristor tap-changer S i (i=1, 2,...n) Choose to send a trigger pulse at the zero crossing point ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses the method for switching the transformer with votlage loads and without transient state as well as the device. The method uses the voltage regulating tap switch with loads composed of all thyristors. In the switching moment, the thyristors throw in to gear, making the tap switch be in non-arcing state. The proper cut-in angle is selected so as to realize the switching without transient process. The device is composed of the voltage transmitter, the current transmitter, the single chip controller, the thristor trigger circuit and the tyristor tap switch groups. The device possesses the advantages of high capabilities of overload, over current and over voltage, high reliability, long service life and frequency regulating operations. Thus, it can be widely used in the electric power system.
Description
(1) Technical field [0001] The invention belongs to the technical field of power system power quality control, and in particular relates to a method and device for on-load voltage regulation of a full-thyristor non-transient transformer. (2) Technical background [0002] Voltage is one of the main indicators of power quality, and voltage deviation affects the stable and economical operation of the power system. Moreover, the voltage deviation directly endangers the electrical equipment. In a power grid with abundant reactive power, on-load tap-changing transformers are widely used to regulate voltage to ensure the voltage quality of the power grid. [0003] At present, more than 90% of the transformers are equipped with on-load tap-changers, and the tap-changers used are all mechanical contacts, which are accompanied by arcs during switching, and the contacts are easy to burn out. Due to the loose internal connector of the mechanical tap changer, poor material strength, po...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): H02M5/12
Inventor 陈允平刘会金舒乃秋
Owner WUHAN UNIV