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Based on dual-winding induction generator dSPACE Real-Time Control System

Print View , by: iSee ,Total views: 40 ,Word Count: 1749 ,Date: Wed, 26 Aug 2009 Time: 4:04 AM

1 Introduction

New dual-winding induction generator stator containing the same number of two sets of pole windings, a winding for the power output termination excitation capacitor, rectifier load: Another set of control winding, then excitation converters, power generation systems for continuous adjustment excitation, maintaining power winding output voltage constant. Double-winding induction generator system of mathematical simulation, including generators, power semiconductors, controls, measuring devices and other mathematical model. The mathematical simulation of continuous systems to ensure integration within the provisions of error is often a dynamic simulation of step length adjustment means to enhance the simulation speed. In the real-time control of power systems, control programs are usually run on dsp and other embedded devices, in a fixed clock cycle control procedures, and implementation of the components - Power Semiconductor send control signals, so that problems such as interrupt latency, the execution time, hardware interfaces, measurement error and other bottlenecks. Solve the above problem is a double-winding induction generator, power semiconductors, sensors, access to simulation loop simulation system according to the actual time of work, you can meet the real-time requirements. This form of semi-physical simulation, also known as rapid control prototyping.

This paper presents a single board system based on dSPACE platform DS1104 test discrete event systems and continuous-time excitation converter dual winding generator system decoupling of real-time simulation method to establish the corresponding test model, and a dual-winding induction generator system a pilot study.

2 excitation system control strategy

When the double-winding induction generator speed or load changes, should maintain output voltage constant need to adjust the motor excitation reactive power, while regulating control winding excitation side of the active power converter DC side capacitor. In this paper, control winding stator flux oriented control strategy, two-winding power system excitation control schematic diagram shown in Figure 1.

Based on dual-winding induction generator dSPACE Real-Time Control System

Control of the whole system is divided into two closed-loop, which will power winding output rectifier bridge output voltage detection of Upd with the Updref compared to the reference voltage error signal obtained by PI regulator obtained by reference to control of reactive current components for a given value of i * sd, to compensate for reactive power control the motor excitation requirements; under the control winding excitation converter DC side capacitor voltage detection value Ucd with the given value to a reference voltage Ucdref compared to the error signal obtained by PI regulator and control over their ride coefficient of -1 in order to obtain reference active current component for a given value of i * sq, to compensate for the active power needed to control the capacitor Cc, which coefficient of -1 indicated that the flow of active power from the electrical excitation converter.

3 Hardware Design of Real-Time System

dSPACE real-time simulation system is based on matlab / Simulink for control system development and testing platform, and Matlab / Simulink completely seamless. In this paper, the DS1104 is a single board system, the main processor, auxiliary DSP, interrupt controller, memory, timers, and the host interface, etc. components. DS1104 controller board using the Pow -

erPC floating-point processor with speeds up to 250MHz, computing ability. DS1104 controller board also integrates TMS320F240DSP as the core I / O subsystems, to meet the specific I / O requirements.

dSPACE software system developed by the algorithm module, real-time module and real-time test monitoring module three parts. DSPACE-based dual-winding generator control system development include:

(1) LAB / Simulink modeling and offline simulation. The use of Matlab / Simulink simulation of the establishment of dual-winding induction generator mathematical model of the object, design control program, and off-line simulation of the system.

(2) I / O access. Matlab / Simulink will need to download to the SPACE to retain the module, using the original hardware interface to replace the relationship between the relationship between the logical connection, configure the I / O, set the hardware and software interrupt priority levels.

(3) the use of RTW and the dSPACE provides tools to automatically generate the code and download the model is converted to real-time simulator can run programs.

(4) dSPACE comprehensive experimental and debugging. Get real-time simulation data using ControlDesk.

A powerful real-time code can achieve the software testing RTI and user-friendly software ControlD-esk, can be double-winding induction generator to quickly build real-time control system platform. System hardware connection schematic diagram shown in Figure 2. Hardware circuit including excitation converters, generator, rectifier load composed of the main loop, but in order to DS1104 as the core control circuit with dual-stator winding voltage, current detection, DC bus voltage detection circuit and protection circuit.

Based on dual-winding induction generator dSPACE Real-Time Control System

The system design contains a 10-way A / D sampling circuit, the A / D sampling circuit for sampling control-side bus current and voltage, the control side of two-phase current (phase current three-phase, only two are independent), the power side of two-phase current voltage and current-voltage power-side bus. Select the required sample through the coaxial cable, respectively DS1104 connected to the 8 ADC units, including: control side current sensing, power-side current sensing, the control side voltage detection, power side voltage detection.

In addition, the use of complex programmable logic device (CPLD) an integrated approach to fault signal. The system design contains 16 protection signal input, after "phase and" resulting from a FAULT signal input to the DS1104 controller board's main processor, the main processor generate hardware interrupt signal to the software program in Matlab to stop running, the same time, BRAKE signal is also output a control platform hardware directly off PWM signal test platform to achieve dual protection. This 16 protection signal processed output of the display of 14 active-low signal to the corresponding LED light alarm.

The control scheme on a three-phase induction motor from its own restructuring of 1500rpm, 900W small prototype of an all-digital control platform to validate the design PI adjustable real-time simulation interface. Controller system cycle 80μs, digital hysteresis loop width of 0.5A.

4 Experimental Study

4.1 system, and self-encouragement to build pressure

105μF capacitor with the self-motivation and self-motivation to build pressure, when the DC voltage to 120V power side is transferred to the control winding when the magnetic field oriented vector control, in the no-load rated speed under the pressure test and self-motivation to build the waveform shown in Figure 3.

Based on dual-winding induction generator dSPACE Real-Time Control System

Figure 3 rated speed under no-load and self-motivation to build pressure test waveforms

As the bridge rectifier DC output side of the larger filter capacitor, as shown in Figure 3 the power side of DC voltage in the construction of stable pressure is always smooth and straight, almost no major fluctuations.

4.2 Excitation capacitor c = 105μF rated load of the transmission process of

System with a rated load, a rapid increase in speed from 1500rpm to 2000rpm, this process uses control winding voltage oriented control strategy, power-side DC voltage up to 9V, about 5.6%, as shown in Figure 4.

Based on dual-winding induction generator dSPACE Real-Time Control System

Rated load and speed control winding voltage and current waveforms in Figure 5. Rated load operation, the control winding line current lags behind the line voltage is about 120 ° (phase current lags behind the phase voltage of about 90 °), due to voltage and current reference direction is in accordance with motor practice, the time control winding excitation converter has a capacitor effect, to generators to provide the necessary reactive power, full load operation, due to the magnetic effect, excitation capacitor can not provide the necessary reactive power generators at this time need to control the winding of compensation, and as the speed increased, the necessary reactive power generator down, the control winding currents getting smaller and smaller, in line with the weak magnetic principle of motor speed increases.

Based on dual-winding induction generator dSPACE Real-Time Control System

5 Conclusion

In this paper, single board system dSPACE platform DS1104 test discrete event systems and continuous-time inverter generator system decoupling of real-time simulation method, pairs of winding sense of

To be generators - inverter - sensor to replace the mathematical model, directly into the simulation loop, the semi-physical simulation, including: the system to build pressure, rated load of the variable-speed operation, etc. The results show that the dSPACE for dual-winding induction power generation system will help shorten the development cycle, reduce development costs and improve system operation reliability.

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