CN203233183U - Low voltage reactive power automatic compensation controller based on digital signal processor - Google Patents

Abstract

The utility model discloses a low voltage reactive power automatic compensation controller based on a digital signal processor. The low voltage reactive power automatic compensation controller is characterized in that a TMS320C5507 DSP processor, an electronic current transformer, an electronic voltage transformer are connected with an FIR digital filter; the FIR digital filter is connected with a conditioning circuit; the conditioning circuit is connected with the four access ports of AIN0, AIN1, AIN2 and AIN3 of an analog-to-digital converter of the DSP processor; a general I/O pin GPIO0-1of the DSP processor is connected with the FIR digital filter; GPIO2-13 of the TMS320C5507 DSP processor is connected with a thyristor trigger system; and an output port of the DSP processor is connected with a peripheral circuit. The low voltage reactive power automatic compensation controller based on the digital signal processor, which is provided by the utility model, has the advantages that the production cost is reduced; action errors of reactive power compensation are reduced and capacitor switching is remotely controlled; and the timely operation ability of reactive power compensation is improved.

Description

A kind of low-voltage reactive power power automatic compensating controller based on digital signal processor

Technical field

The utility model relates to the line voltage technical field, particularly a kind of low-voltage reactive power power automatic compensating controller based on digital signal processor.

Background technology

Line voltage is one of important indicator of electric power system, grid voltage quality is weighed with indexs such as stability, symmetry and sines usually, along with nonlinear loads such as power electronic equipment insert electrical network in a large number, grid supply quality is affected, the extensive application of various electronic power switch devices and the frequent fluctuation of load are main interference sources, have produced following adverse consequences:

(1) power factor is low, increases the electric network reactive-load loss, reduces transformer utilization factor, strengthens production cost, reduces productivity ratio.

(2) reactive power impact of Chan Shenging cause that line voltage falls, voltage fluctuation and flickering, cause the transmission device can't operate as normal and protective device misoperation when serious, even stop production.

(3) producing higher harmonic current, cause the line voltage distortion, is " the stealthy killer " of electrical network.

(4) cause the electrical network three-phase imbalance, the negative-sequence current of generation vibrates rotor.

At present, addressing the above problem the method for generally using is to insert dynamic reactive power compensation equipment near the disturbance load access point, offset perceptual reactive power impact with capacitive reactive power, the filtering high order harmonic component, the balance three phase network, its representational mode is to adopt thyristor switchable capacitor (TSC), and its key character is that the specific requirement according to power factor can drop into one group of (or many groups) capacitor, also can excise one group of (or many groups) capacitor.The shortcoming of this kind control mode is low precision, and response speed is slow, poor anti jamming capability.

Summary of the invention

The purpose of this utility model provides a kind of low-voltage reactive power power automatic compensating controller based on digital signal processor, the control precision height of this controller, response speed is fast, and antijamming capability is strong, can effectively solve action error and the big problem of delay time error of reactive power compensation.

For achieving the above object, the utility model is realized by the following technical solutions:

A kind of low-voltage reactive power power automatic compensating controller based on digital signal processor, it is characterized in that, comprise electronic current transducer, the electronic voltage instrument transformer, Finite Impulse Response filter, modulate circuit, the TMS320C5507 dsp processor, the thyristor triggering system, the LCD LCD, PC and peripheral circuit, described electronic current transducer, the electronic voltage instrument transformer is connected with Finite Impulse Response filter, Finite Impulse Response filter is connected with modulate circuit, the AIN0 of the A/D converter of modulate circuit and TMS320C5507 dsp processor, AIN1, AIN2, four access ports of AIN3 link to each other, the general purpose I of TMS320C5507 dsp processor/O pin GPIO0-1 links to each other with Finite Impulse Response filter, the GPIO2-13 of TMS320C5507 dsp processor links to each other with the thyristor triggering system, the direct memory access controller DMA of TMS320C5507 dsp processor links to each other with the LCD LCD, the multi-channel serial buffering mouthful McBSP of TMS320C5507 dsp processor links to each other with PC, and a delivery outlet of TMS320C5507 dsp processor links to each other with peripheral circuit.

Compared with prior art, the beneficial effects of the utility model are:

Reduce production costs, the Long-distance Control capacitor switching also reduces the action error of reactive power compensation, has improved the timely operation ability of reactive power compensation, has avoided in the circuit causing loss because of voltage fluctuation and flickering.

Description of drawings

Fig. 1 is structured flowchart of the present utility model.

Embodiment

Below in conjunction with accompanying drawing embodiment of the present utility model is further specified:

As shown in Figure 1, the utility model is mainly by electronic current transducer, the electronic voltage instrument transformer links to each other with Finite Impulse Response filter, Finite Impulse Response filter links to each other with modulate circuit, the AIN0 of modulate circuit and DSP A/D converter (ADC), AIN1, AIN2, four access ports of AIN3 link to each other, the general purpose I of DSP/O pin (GPIO) GPIO0-1 links to each other with Finite Impulse Response filter, GPIO2-13 links to each other with the thyristor triggering system, the DMA(direct memory access controller of DSP) links to each other with the LCD LCD, the McBSP of DSP (multi-channel serial buffering mouth) links to each other with PC, and a delivery outlet links to each other with peripheral circuit.

In order to make controller have applicability widely, the input signal of controller is taken from the secondary side of voltage transformer (PT) summation current transformer (CT) of test line respectively.Signal receiving circuit receives the signal from PT, CT, they is converted to the signal of sample circuit demand, and will guarantees the authenticity (undistorted) of original signal.This just requires the signal place in circuit will have enough wide frequency corresponding, guarantees that the amplitude distortion of input signal is very little, and phase place has linear characteristic.

The signal that inserts at first by electronic type voltage transformer or electronic current mutual inductor, is finished electrical transformation and electrical isolation.To be that the ac voltage signal of 0 ~ 100V becomes 0 ~ 0.6V ac voltage signal from the effective value of PT with electronic type voltage transformer.Electronic current mutual inductor will become 0 ~ 1.6V ac current signal from the ac current signal of 0 ~ 5A of CT.And the signal that will sample and external signal are in electric isolation, thus the raising antijamming capability, the safety of the assurance person and controller.The amplifier input stage adopts differential input can reduce drift, improves input impedance.So input signal is done the conversion of voltage-to-current-voltage.Electronic type voltage transformer adopts the Zhuzhou TV100-1500V in south car epoch, and electronic current mutual inductor adopts Beijing Hua Zhixing HKA-20NP far away.

Owing to have harmonic wave, non-whole subharmonic, subharmonic in the electrical network, make zero crossing that uncertain displacement take place, for keeping the accuracy of sampling, should increase the low-pass filtering link, the double amplification fundamental frequency signal of doing also in the filtering high-frequency signal.

Above described only be basic principle of the present utility model, be not that the utility model is imposed any restrictions, everyly according to the utility model it is carried out equivalent variations and modification, all within the category of the art of this patent protection scheme.

Claims (1)

1. low-voltage reactive power power automatic compensating controller based on digital signal processor, it is characterized in that, comprise electronic current transducer, the electronic voltage instrument transformer, Finite Impulse Response filter, modulate circuit, the TMS320C5507 dsp processor, the thyristor triggering system, the LCD LCD, PC and peripheral circuit, described electronic current transducer, the electronic voltage instrument transformer is connected with Finite Impulse Response filter, Finite Impulse Response filter is connected with modulate circuit, the AIN0 of the A/D converter of modulate circuit and TMS320C5507 dsp processor, AIN1, AIN2, four access ports of AIN3 link to each other, the general purpose I of TMS320C5507 dsp processor/O pin GPIO0-1 links to each other with Finite Impulse Response filter, the GPIO2-13 of TMS320C5507 dsp processor links to each other with the thyristor triggering system, the direct memory access controller DMA of TMS320C5507 dsp processor links to each other with the LCD LCD, the multi-channel serial buffering mouthful McBSP of TMS320C5507 dsp processor links to each other with PC, and a delivery outlet of TMS320C5507 dsp processor links to each other with peripheral circuit.