Electric power generating system and control method thereof

A technology of power generation system and control method, which is applied in the direction of control system, control generator, electrical components, etc., can solve the problem that the power generation system is difficult to maintain constant frequency output, and achieve the effect of reducing maintenance costs and time

Active Publication Date: 2014-03-26
东元总合科技(杭州)有限公司
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Problems solved by technology

[0005] In order to solve the existing power generation system with synchronous motor as the core, the power generation system is difficult to maintain a constant frequency output defect when the prime mover is running at variable speeds, and provides a power generation system and a control method for the power generation system

Method used

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  • Electric power generating system and control method thereof
  • Electric power generating system and control method thereof
  • Electric power generating system and control method thereof

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Embodiment 3

[0077]The difference between embodiment three and embodiment one, embodiment four and embodiment two is that a third frequency conversion device 8 is set between the stator winding of the first motor and the grid 5, so that the three-phase output from the stator winding end of the first motor 1 The frequency of the alternating current may not be equal to the frequency of the power grid, and the frequency is converted by the third frequency conversion device 8 before being input into the power grid.

[0078] The reason why the third frequency conversion device 8 is added is that when the stator winding of the first motor 1 outputs three-phase alternating current at the grid frequency (for example, 50 Hz is used in my country), if the number of poles of the first motor 1 is small, the rotor of the first motor 1 needs the original The motor 6 provides a relatively high speed, but in hydroelectric power generation and wind power generation, the prime mover 6 cannot provide a high sp...

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Abstract

The invention provides an electric power generating system and a control method thereof, and the system and method provided by the invention are used for solving the defect that the existing electric power generating system which centers on a synchronous motor has less possibility of maintaining constant frequency output when a prime motor operates in a speed change mode. According to the invention, the frequency of an alternating current excitation power supply which is output by a first frequency conversion device is controlled to be always equal to the slip frequency of a first motor according to the preset frequency of three-phase alternating current which is output according to the rotation speed of a first motor rotor and a first motor stator winding so as to adapt to the variations of the rotation speed of the first motor, thus the variations of the rotation speed of the first motor are matched with the optimal rotation speed of the prime motor, the speed change constant frequency output of the electric power generating system is realized, simultaneously the efficiency of the electric power generating system is improved, and the static state and transient state stability of the electric power generating system are improved obviously.

Description

technical field [0001] The invention relates to the technical field of power generation, in particular to a power generation system and a control method for the power generation system, and the system is especially suitable for wind power generation and hydropower generation. Background technique [0002] Traditional synchronous generators are widely used in various forms of power generation systems due to their mature technology, simple structure and low cost. For hydropower generation systems and wind power generation systems, since the water flow speed and wind speed are constantly changing at various times of the day, it is difficult for the prime mover or the output speed of the prime mover to be kept constant through a transmission mechanism such as a gear box. When using a synchronous generator as In the core power generation system, the voltage frequency and amplitude output by the power generation system are difficult to maintain stability. For wind power generatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P9/42H02J3/38H02J3/18
CPCY02E40/30
Inventor 高关中刘立军张映明
Owner 东元总合科技(杭州)有限公司
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