Asynchronous generator soft grid-connected system and method
An asynchronous generator, soft grid-connected technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of power system paralysis, low generator capacity, energy consumption, etc.
Pending Publication Date: 2021-05-07
西安西驰电气股份有限公司
View PDF0 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Nowadays, most asynchronous generators still transmit power through direct grid connection, and the impact current is as high as 6 to 8 times the rated current of the generator. The strong mechanical impact may damage the generator and impeller, and at the same time affect the stability of other equipment in the grid. serious damage may lead to the paralysis of the entire power system
The operation of direct grid connection is convenient, but there is a current impact at the moment of grid connection, which will affect the generator set, impeller and other equipment in severe cases, and the generator capacity is low
Resistors or reactances need to be added for step-down and grid connection, which will consume a part of energy in the circuit, and the economic benefit is poor
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
[0021] The present invention is described in further detail below in conjunction with accompanying drawing:
[0022] Such as figure 1 , figure 2 As shown, an asynchronous generator soft grid-connected system includes a soft grid-connected controller 1 and a thyristor control circuit 2 and a contactor 3 connected to the soft grid-connected controller. The thyristor control circuit 2 and the contactor 3 are connected in parallel to the power grid 5 Between and the asynchronous generator 6, the soft grid-connected controller 1 is connected to the asynchronous generator 6, and is used to detect the rotational speed of the asynchronous generator, and simultaneously control the thyristor control circuit and the contactor to be turned on and off.
[0023] As shown in the figure, the thyristor control circuit includes three pairs of anti-parallel thyristors, and the three-phase circuit between the grid 5 and the asynchronous generator 6 is connected with a pair of anti-parallel thyr...
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 an asynchronous generator soft grid-connected system and method. The voltage phase of a power grid is detected, the voltage of the power grid is adjusted through a thyristor and then connected to an asynchronous generator according to phase voltage signals of all phases of the power grid to be connected, the voltage after voltage adjustment and an external power source jointly drive the asynchronous generator, the asynchronous generator is in a motor state at the moment, the input voltage of the asynchronous generator is gradually increased, a current signal of the asynchronous generator is detected in real time at the same time, when the input current of the asynchronous generator is stable and 1.2 times lower than the rated current, a bypass contactor is closed, the asynchronous generator is connected into the power grid, the output power of an external power source is increased at the moment, the rotating speed of the asynchronous generator is greater than the rated rotating speed, and the asynchronous generator works in a power generation state to realize soft grid connection. The system can effectively control the impact current in the grid-connected process of the asynchronous generator, reduces the impact on the power grid in the grid-connected process, and protects the safe operation of equipment.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a soft grid-connected system and method for an asynchronous generator. Background technique [0002] The asynchronous generator has many advantages such as simple structure, no collector ring and carbon brush, high reliability, simple load control, no oscillation and out-of-step problems, and easy grid-connected operation. Utilizing the characteristics of the asynchronous generator, it can be used as a means of reactive power compensation after being connected to the grid, which can significantly improve the grid environment of the power transmission system and generate greater economic benefits. Nowadays, most asynchronous generators still transmit power through direct grid connection, and the impact current is as high as 6 to 8 times the rated current of the generator. The strong mechanical impact may damage the generator and impeller, and at the same time...
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): H02J3/38H02J3/42
CPCH02J3/38H02J3/381H02J3/42
Inventor 蔡剑阮庆利王鹏
Owner 西安西驰电气股份有限公司