CN201181845Y

CN201181845Y - Static reactive compensator based on in-place DSP

Info

Publication number: CN201181845Y
Application number: CNU2007200640037U
Authority: CN
Inventors: 罗安; 盘宏斌; 陈栋; 何伟; 彭双剑; 赵伟
Original assignee: Hunan University
Current assignee: Hunan University
Priority date: 2007-07-31
Filing date: 2007-07-31
Publication date: 2009-01-14
Anticipated expiration: 2017-07-31

Abstract

The utility model discloses a fixed-point DSP-based static reactive power compensator, which comprises a DSP controller, a current sampling circuit, a voltage sampling circuit, a signal regulating circuit, an optical-fiber driving circuit, a RS232/485 circuit, a thyristor fling-switch capacitor group and a thyristor control linearity reactor, wherein, the input ends of the current sampling circuit and the voltage sampling circuit are respectively connected with a three-phase current and a three-phase voltage; the output ends of the current sampling circuit and the voltage sampling circuit are connected with the input end of the signal regulating circuit; the signal regulating circuit regulates the sampled signal, and sends the sampled signal to the DSP controller; after processing the sampled signal, the DSP controller outputs an TSC control signal and a TCR control signal; the TSC control signal and the TCR control signal are sent to the optical-fiber driving circuit after being regulated by the signal regulating circuit, and are sent to the thyristor fliing-switch capacitor group and the thyristor control linearity reactor by the optical-fiber driving circuit. The compensator has small volume, and rapid adjustment speed, and also has the functions such as the prevention of the voltage flickering and the unbalancing degree, and the like besides the functions of voltage stabilizing and the reactive power compensation.

Description

Static Var Compensator based on fixed DSP

Technical field

The utility model relates to a kind of reactive power compensator, particularly a kind of Static Var Compensator based on fixed DSP.

Background technology

The situation of idle deficiency and idle surplus may appear respectively in modern power systems under different operational modes, the load of all kinds of electric power systems need carry out reactive power compensation because its non-linear and disequilibrium also can be brought to electric power system and pollute and interference.Reactive power compensation is a kind of important means that keeps the operation of electrical network high-quality, and at present, what mainly use in the reactive power compensation field is the capacitor in parallel with the network inductive load, and advanced static reacance generator etc.With capacitor in parallel with the network inductive load be the conventional method of compensating power, that shunt capacitor has is simple in structure, economical convenient, can improve circuit parameter, reduces the circuit lagging reactive power, bucking-out system is idle, improves advantages such as quality of voltage.Shortcoming is that impedance is fixed or classification is fixed, and reactive requirement that can not follow load changes, can only compensate fixing idle, but also might and system's generation parallel resonance, cause harmonic wave to amplify.Static reacance generator has that governing speed is fast, adjustable range is wide, harmonic wave output is little and undervoltage condition under advantages such as idle regulating power is strong, but the production and the development level that are limited to power electronic device are made jumbo ASVG at present and are still had problems such as technical difficulty is big, cost height.

The utility model content

For overcoming the existing technical problem that the reactive power compensator volume is excessive, harmonic content is high, range of operation is little, the utility model provides the Static Var Compensator based on fixed DSP control that a kind of governing speed is fast, range of operation is wide, harmonic content is little.

The technical scheme that the utility model solves the problems of the technologies described above is: comprise dsp controller, current sampling circuit, voltage sampling circuit, signal conditioning circuit, optical fiber driving circuit, the RS232/485 circuit, the thyristor switchable capacitor group, thyristor control linear reactor, described current sampling circuit, the input of voltage sampling circuit connects three-phase current respectively, three-phase voltage, current sampling circuit, the output of voltage sampling circuit connects the input of signal conditioning circuit, signal conditioning circuit is nursed one's health sampled signal and is delivered to dsp controller again, dsp controller is handled back output TSC control signal to sampled signal, the TCR control signal, the TSC control signal, the TCR control signal is delivered to optical fiber driving circuit after the signal conditioning circuit conditioning, deliver to the thyristor switchable capacitor group by optical fiber again, thyristor control linear reactor.

In the above-mentioned Static Var Compensator based on fixed DSP, described thyristor control linear reactor is the thyristor control linear reactor that a cover triangle connects.

In the above-mentioned Static Var Compensator based on fixed DSP, described thyristor switchable capacitor group is that seven cover single tuned filters and a cover high pass filter are formed, and every cover filter is the wye connection of three-phase three-wire system.

The beneficial effects of the utility model: the utility model adopts the static compensator structure of TSC+TCR mix mode, provide the leading idle coarse adjustment of carrying out by TSC, idlely carry out fine tuning by what TCR provided hysteresis then, carrying out the dynamic Continuous Compensation of reactive power, and can be in Continuous Compensation in perception and the capacitive scope; Adopt the master chip of DSP as controller, main circuit parameter of having optimized and utilization are based on the Adaptive Fuzzy Control strategy of on-line study; Use is based on the drive circuit of optical fiber, can avoid electromagnetic interference and the misoperation that brings.The device governing speed is fast, and range of operation is wide, has significantly reduced the content of harmonic wave in the offset current after the measures such as employing optimization tuning filtering technology, has dwindled the volume and the cost of device.And the reactive power compensator of employing TSC+TCR hybrid structures, utilize intelligent control technology, can realize that reactive power is adjustable continuously in capacitive and perceptual scope, and overcome that the fixed capacitor group exports that the idle non-adjustable and idle output classification of mechanical type opening-closing capacitor bank output, response speed are slow, capacitor self switching is to shortcomings such as the impact of electrical network and mechanical switch restrictions in useful life.

Below in conjunction with drawings and Examples the utility model is further described.

Description of drawings

Fig. 1 is a The general frame of the present utility model.

Fig. 2 is a main circuit block diagram of the present utility model.

Embodiment

As shown in Figure 1, the SVC system mainly is made of with the star-like thyristor switchable capacitor group TSC that is connected the thyristor-controlled reactor TCR that DSP control board, TCR pulse generation plate, TSC signal generation plate, optical fiber conditioning change-over panel, output pulses trigger board, triangle connect, and wherein the inductance L in the single tuned filter of forming with capacitor C among the TSC is not drawn.Among the figure, the three-phase voltage of transmission line, the three-phase current (load compensation) of three-phase current (system balance) or load is linked into signal regulating panel by voltage sensor and current sensor respectively and is converted to the receptible signal of DSP, enter the A/D interface of DSP then, dsp controller is by RS485 serial ports and upper machine communication on the plate, obtain user control command, under different control models, sampled data is handled, realize the SVC reactive power compensation, burning voltage, suppress functions such as voltage flicker and degree of unbalance, export high-precision trigger impulse according to function corresponding, and as required pulse is converted into analog signal (the pilot angle voltage of TCR) or switching value (the switching instruction of TSC), be defeated by TCR pulse generation plate and TSC signal generation plate, again by optical fiber conditioning change-over panel, utilize optical fiber as transmission medium to the output pulses trigger board, control the input and the excision of the thyristor on the thyristor valve and thyristor switchable capacitor on the thyristor-controlled reactor respectively.

As shown in Figure 2, main circuit of the present utility model mainly by 8 groups of star-like connections thyristor switchable capacitor group and the linear reactor controlled of the thyristor that is connected of cover triangle form, wherein 7 groups of electric capacity are arranged is C to the electric capacity in the capacitor group, one group of electric capacity is C/2, so just can export 16 grades of segmentation capacitive reactive powers, increase rapidity, and can distinguish filtering 2,3,4,5,6,7,8 and 11 subharmonic, it is idle that the reactor TCR of thyristor control can absorb perception, the two cooperatively interacts idle adjustable continuously between can be between positive and negative, thereby overcomes the idle nonadjustable shortcoming of fixed capacity group.

Claims

1, a kind of Static Var Compensator based on fixed DSP, it is characterized in that: comprise dsp controller, current sampling circuit, voltage sampling circuit, signal conditioning circuit, optical fiber driving circuit, the RS232/485 circuit, the thyristor switchable capacitor group, thyristor control linear reactor, described current sampling circuit, the input of voltage sampling circuit connects three-phase current respectively, three-phase voltage, current sampling circuit, the output of voltage sampling circuit connects the input of signal conditioning circuit, signal conditioning circuit is nursed one's health sampled signal and is delivered to dsp controller again, dsp controller is handled back output TSC control signal to sampled signal, the TCR control signal, the TSC control signal, the TCR control signal is delivered to optical fiber driving circuit after the signal conditioning circuit conditioning, deliver to the thyristor switchable capacitor group by optical fiber again, thyristor control linear reactor.

2, the Static Var Compensator based on fixed DSP according to claim 1 is characterized in that: described thyristor control linear reactor is the thyristor control linear reactor that a cover triangle connects.

3, the Static Var Compensator based on fixed DSP according to claim 1 is characterized in that: described thyristor switchable capacitor group is that seven cover single tuned filters and a cover high pass filter are formed, and every cover filter is the wye connection of three-phase three-wire system.