Vector High Frequency Dynamic Response System Implementation - Vector Converter, Speed Control

1 Introduction High dynamic response speed control system is to ensure stability

on the basis of the output speed, fast response time to the quantitative, the system will follow a steady and rapid load changes, load changes, etc. from outside interference caused by the rapid pace of transition to resume quickly. Previously achieved mainly DC drive system, consider the DC drive system of power, maintenance and other reasons, try to use vector control induction motor variable frequency control technology to achieve high dynamic response of the speed control system.

Induction motor dynamic mathematical model of a high order, non-linear, strongly coupled multi-variable system can be achieved through the coordinate transformation to simulate the three-phase AC motor DC motor torque control law [1]. Vector control is based on rotating magnetic field as the criteria, the establishment of three-phase winding current, the two groups of AC current and the rotation axis orthogonal winding equivalent relation between the DC current to achieve decoupling the stator current and the system down order and linearized.

2 control strategy Open loop flux slip vector control system is to use open-loop control of flux, to avoid the rotor flux feedback signals are not precise and the impact on the control precision, the magnetic field orientation from the flux and torque for a given signal to determine not with the actual calculation of rotor flux and phase, but through parameter identification and adaptive control to indirect field orientation, and speed control is still closed, so that inherited the steady-state model of induction motors based on slip frequency control system, the advantages of also use a dynamic model of induction motor based on vector control law based on the good stability greatly improved dynamic performance, is now in the parameter identification and adaptive control to do a lot of good converter, choose the right type high-performance induction motor control, parameter setting can be achieved through a number of high dynamic speed regulation system. According to this thinking

Siemens 6se70 transducer design based on a vector control, control of a 60kw1ph7 series induction motor, the no-load to achieve 10% of step speed response time of less than 200ms of the dynamic response requirements system in the transition process without oscillation and overshoot less than 2%.

3 system composition The speed control system consists of a 75kw inverter 6se7031-5ef60, together with the necessary external hardware components, to achieve the system of local and remote start, stop, for a given, and monitoring. Appropriate choice of brake systems unit, braking resistor is used to slow down and brake motors consume energy feedback to improve the dynamic performance of deceleration process. Induction motor model 1ph7184-2hf300bc0, 60kw, the main parameters are: the rated speed of 1750r/min, the maximum speed is 5000r/min, fundamental frequency as 59.0hz, rated current 120.0a, rated voltage of 388v, torque 327n. m, power factor cos= 0.78. Motor comes with cooling fan speed encoder (1024), the temperature sensor.

4 system debugging Debug the system before the electrical inspection, to ensure that all correct and reliable electrical connections, all have a reasonable set of thermal overload protection; and then check the power to confirm the main circuit, auxiliary control loop in the normal state, the cooling fan turned correct. First, a simple parameter setting, a preliminary look at the entire system can work; then the expert application of parameter settings, this process is the basic feature set, and the electrical parameters of input inverter, the inverter self-tuning to obtain motor parameters.

In accordance with the requirements 6se7031-5ef60 manual parameter setting, combined use of internal free converter modules, realization of a computer / manual and computer simulation of a given volume / manual for a given choice of a given step, and the feedback given amount of The analog output function.

Dynamic response parameters be adjusted to ensure the principles of the mechanical characteristics of the system to obtain the dynamic response of the minimum time for the flux regulator generally adopted from the setting value, to prevent inappropriate changes affect the magnetic flux given.

by:gaga

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