Control apparatus for three level dynamic voltage recovery device

Abstract

The invention relates to a control device of a three-level dynamic voltage restorer, which comprises a power system containing a voltage transformer, and is characterized in that the power system comprises a control panel, a central data treatment circuit, a photoelectric conversion circuit, a fiber communication system, a driving circuit, a three-level power circuit and a voltage sampling circuit. The control device of the three-level dynamic voltage restorer has the advantages that: 1, the control speed and the precision are increased, the programming is simple, and the whole control systemhas excellent regulation performance and reliability. 2, a hardware circuit which comprises DSP+CPLD is simple, pulse is safely and reliably output, and the precision of real-time control is high. 3,the fiber communication system is used, and the anti-interference ability is strong. 4, a three-level power module circuit is used as a main circuit topological structure of DVR, thereby increasing the capacity of the device and compensation voltage, and improving the harmonic characteristics of output voltage. 5, a 2SD315A driving chip is used as a trigger chip to drive the pulse, the driving capability is strong, and the control is convenient.

Description

(1) Technical field: [0001] The invention belongs to the technical field of power system three-level dynamic voltage restorer (Dynamic Voltage Restorer, DVR) control, and is a three-level dynamic voltage restorer based on a new TMS320F28335 floating-point digital signal processor (digital signal processor, DSP). controller control device. (two) background technology: [0002] The dynamic voltage restorer is a voltage source type power electronic compensation device, which is connected in series between the power supply and the important load, and has good dynamic performance and harmonic characteristics. When the voltage drop or sudden rise occurs in the system, the load voltage at the fault can be restored to the normal value within a short time (several milliseconds), ensuring that important loads are not affected by voltage fluctuations. A three-level dynamic voltage restorer is usually composed of an energy storage device, a three-level inverter device, a filter induct...

AI Technical Summary

Problems solved by technology

A three-level dynamic voltage restorer is usually composed of an energy storage device, a three-level inverter device, a filter inductor, a coupling capacitor, a sampling circuit, and a control system. The control system is mostly a fixed-point DSP as the control core. One of the entire device, The secondary side control signal and feedback signal are mostly transmitted by analog signal, and the control device has disadvantages such as complex hardware circuit, difficult debugging, poor anti-interference ability and complicated programming.

Because high-power circuits have high requirements for trigger pulses, it is difficult for traditional control devices to meet the requirements of modern power circuits in terms of control accuracy and control speed.

With the rapid development of digital control technology and the higher and higher requirements for power quality in the power industry, the requirements for control devices are also increasing. Traditional control devices have been difficult to meet the requirements of modern industry for control performance.

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