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Energy efficiency evaluation method of asynchronous motor under three-phase voltage imbalance

A technology for asynchronous motors and three-phase voltage, which is applied in the fields of electrical digital data processing, computer-aided design, and special data processing applications, etc., and can solve problems such as inability to evaluate energy efficiency, unbalanced three-phase voltage, loss, etc.

Inactive Publication Date: 2020-12-04
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology

[0004] In order to overcome the problem in the above-mentioned prior art that the energy efficiency of the motor under unbalanced three-phase voltage cannot be evaluated, the present invention provides an energy efficiency evaluation method for an asynchronous motor under unbalanced three-phase voltage, which can evaluate the energy efficiency of the motor, thereby solving the problem in a targeted manner Loss Problem Caused by Three-phase Voltage Unbalance in Distribution Network

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  • Energy efficiency evaluation method of asynchronous motor under three-phase voltage imbalance
  • Energy efficiency evaluation method of asynchronous motor under three-phase voltage imbalance
  • Energy efficiency evaluation method of asynchronous motor under three-phase voltage imbalance

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Embodiment 1

[0079] Such as Figure 1-5 Shown is an embodiment of an energy efficiency evaluation method for an asynchronous motor under unbalanced three-phase voltage, and the specific steps are as follows:

[0080] Step 1: According to the T-type equivalent circuit and the symmetrical component method, the energy efficiency simulation model of the asynchronous motor under the unbalanced three-phase voltage is established; the T-type equivalent circuit includes the resistor r connected in series on the stator side 1 and reactance x 1 , series excitation resistor r m and magnetizing reactance x m , the rotor resistance r after the series frequency reduction 2 ′ / s and reactance x 2 '; the reactance x 1 , excitation resistance r m ,, the rotor resistance r2' / s are connected to the same point, the exciting reactance x m with the reactance x 2 ' output connection. The T-type equivalent circuit is divided into a positive sequence T-type equivalent circuit and a negative-sequence T-type...

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Abstract

The invention relates to an energy efficiency evaluation method for an asynchronous motor under three-phase voltage imbalance, and the method comprises the steps: 1, building an energy efficiency simulation model according to a T-type equivalent circuit and a symmetric component method; step 2, under the same load condition, acquiring energy efficiency data of the asynchronous motor interfered bythree-phase voltage imbalance; 3, substituting the data into an energy efficiency model to perform simulation calculation, performing error analysis on a simulation value and an actual measurement value of the energy efficiency, and correcting a theoretical energy efficiency simulation model; and 4, performing simulation calculation again, and performing least square-based curve fitting on simulation data to obtain a function relationship between the asynchronous motor energy efficiency and the three-phase voltage unbalance degree at a rated rotating speed. Through the evaluation method, the energy efficiency of the motor can be accurately obtained according to the three-phase unbalance degree, so that the energy efficiency condition of the motor is known, a worker can know the loss of themotor in time, and the loss problem caused by three-phase voltage unbalance in the power distribution network is solved in a targeted manner.

Description

technical field [0001] The invention relates to the field of motor energy efficiency evaluation, and more specifically, relates to an energy efficiency evaluation method of an asynchronous motor under unbalanced three-phase voltage. Background technique [0002] The three-phase asynchronous motor accounts for more than 60% of the total load of the power grid, and its energy efficiency of converting electrical energy into mechanical energy directly affects the loss of the power grid. The development of society has brought a large number of single-phase loads into use among power users, which has brought serious three-phase voltage imbalance problems to the distribution network. The unbalanced three-phase voltage at the input end of the asynchronous motor can generate a negative-sequence magnetic field in the air gap, induce a large negative-sequence current, and cause mechanical vibration while braking the rotor rotation. In-depth analysis of the influence of three-phase vol...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F30/367
CPCG06F30/20G06F30/367
Inventor 武建平陈子辉吴智影刘勇浩李辰盟杨玺刘贺王硕君麦荣焕叶伟玲何兴华殷江汤铭华陈劲万志强周锟倪惠浩陈积会许巧云廖浩泉刘恒
Owner GUANGDONG POWER GRID CO LTD
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