CN205160070U - Controlling means based on DSTATCOM topological structure - Google Patents
Controlling means based on DSTATCOM topological structure Download PDFInfo
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- CN205160070U CN205160070U CN201520979938.2U CN201520979938U CN205160070U CN 205160070 U CN205160070 U CN 205160070U CN 201520979938 U CN201520979938 U CN 201520979938U CN 205160070 U CN205160070 U CN 205160070U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model discloses a controlling means based on DSTATCOM topological structure, including three -phase full -bridge voltage source code converter, every looks unit of three -phase full -bridge voltage source code converter constitute by upper and lower two bridge arms, every bridge arm is cascaded by 3 sub - modules, every submodule piece is by two IGBT, two anti -parallel diode and a branch stray capacitance constitute, direct current side at three -phase full -bridge voltage source code converter is connected with lumped capacitance simultaneously, it exchanges the side and is connected the inductance connects, voltage sensor and the current sensor of setting on three -phase full -bridge voltage source code converter respectively with the DSP controller on AD sampling circuit be connected. The utility model discloses can reduce the idle of grid system and harmonic current content, greatly reduced the electric loss of distribution network, realized electric energy -conservation to the electric energy quality of electric wire netting has been improved.
Description
Technical field
The utility model relates to a kind of control device based on DSTATCOM topological structure, belongs to power grid control technical field.
Background technology
Along with the progress of science and technology and the needs of development, Large Copacity high pressure long distance power transmission has become a kind of engineering demand, and the long-distance transmissions of electric energy must bring a lot of problem, the such as series of problems such as loss, the quality of power supply.At present, modern power electronics technology has applied to Large Copacity high pressure flexible direct current transmission of electricity (HVDC) and the flexible field such as flexible AC transmission (FACTS), and nonlinear power electronic device is filled with harmonic wave and idle to electric power system.From instantaneous reactive power theory, the power that the harmonic voltage electric current of different frequency produces is broad sense reactive power, so, the application of power electronic technology reduces the power factor of electric power system, along with the extensive application of various quality of power supply sensitiveness load, the requirement of power consumer to the quality of power supply also improves day by day.And the converter that the main circuit of the compensation arrangement of general improvement harmonic wave is normally made up of power electronic device, from the angle of electric energy-saving, these converters are (consumption of harmonic wave are larger compared to fundametal compoment) of requiring the expenditure of energy, but from the overall angle of whole power distribution network, its compensation makes all parts of whole power distribution network all achieve electric energy-saving, so it can realize electric energy-saving on the whole.In power distribution network, the static reacance synchronous compensator of Small And Medium Capacity is arranged near some specific load (as arc furnace), the quality of power supply at load and public electric wire net tie point place can be improved significantly, such as, improve power factor, overcome three-phase imbalance, eliminate voltage flicker, administer harmonic pollution etc.This static reacance synchronous compensator being used for improving the quality of power supply in power distribution network is commonly referred to as Distribution Static Compensator.
The idle of harmonic current generation is a kind of sensu lato reactive power, Active Power Filter-APF and STATCOM there is no difference in essence, their topological structure is roughly the same with control strategy, and just slightly difference and choosing of inductance capacitance value are not quite similar control circuit.But there is certain impact and disturbance to electric power system in reactive power:
One is that place capacity increases.The increase of reactive power, total current in transmission line can be increased, thus add the capacity of power transformer, generator, power transmission line and other electric equipment, increase the control appliance of user, the specification of starting device and size, add the cost of whole system;
Two is increase equipment and line loss.The increase of reactive power can increase total current in transmission line, thus adds the loss of power consumption equipment and transmission line;
Three is the voltage drops increasing transformer and circuit.The increase of reactive power, can increase the voltage loss in electric power system, thus causes the fluctuation of voltage.In electrical network, the frequency of active power main influence systems, the voltage of reactive power main influence systems.If load is acute variation, the stability of system can be destroyed, make line voltage produce violent fluctuation, even seriously electric power accident can occur;
Four is if the reactive power of system supply is not enough, user side supply power voltage can be made to decline, if the reactive power of supply is superfluous, user side supply power voltage can be made to raise, affect the normal life of industrial production and the people.
Due to the continuous increase that some impact loads are applied in power distribution network, power distribution network reactive power more and more presents that fluctuation is fast, fluctuation is comparatively large, fluctuate the feature such as frequent, needs to carry out fast, dynamic reactive power compensation.Traditional fixed capacitor Reactive Compensation Mode, although with low cost, realize simple, can not meet dynamic reactive power compensation requirement.Static passive compensation device (SVC), can administer dynamic reactive power, but it runs the impact being subject to the system environmentss such as line voltage, in the course of work, self can produce certain harmonic wave, dynamic responding speed is comparatively slow, may cause resonance and flexibility is not high.Power distribution network Static Synchronous compensates (DSTATCOM), can compensation network dynamic reactive power fast, its rapid dynamic response speed, operational reliability is high, pollution-free to electrical network, convenient, flexible, based on these advantages, DSTATCOM is just obtaining applying more and more widely.Meanwhile, DSTATCOM technology solves power quality problem that non-linear, uneven and impact load brings and increases power distribution network conveying capacity, improves transient-stability limit and strengthen the effective means of electrical network damping.Therefore, the realization furtheing investigate DSTATCOM device has a very important role to raising distribution network electric energy quality.
In addition, IGBT is as large power all-controlled type power electronic device, advantage is that the controlled conducting processed of device also can control to turn off, PWM technology is adopted to avoid the displacement factor of thyristor converter and the too low (because the angle of departure is controlled of fundamental factor, so output voltage waveforms meeting distortion, it not standard sine wave, through fourier decomposition, the inside is containing low frequency harmonic content, the amplitude of harmonic component is relevant with Trigger Angle) and cause low power factor to run, only produce near switching frequency and the high frequency harmonic components of integral multiple, only need low capacity filter to get final product filtering.The inferior position of IGBT is compared to thyristor, the device through-current capability of identical cost is poor, and withstand voltage is relatively low, and when realizing identical capacity delivery of electrical energy and conversion, the on-state loss of device is comparatively large, and there is switching loss (with switching frequency linear approximate relationship).Because the non-linear loss brought of device itself only has by changing inner PN junction to realize, and adopt advanced control technology can bring better harmonic characterisitic and lower loss.
Summary of the invention
The utility model provides a kind of control device based on DSTATCOM topological structure, this device can decrease the idle of network system and harmonic current content, greatly reduce power distribution network electrical loss, achieve electric energy-saving, and improve the quality of power supply of electrical network.
The technical solution of the utility model: a kind of control device based on DSTATCOM topological structure, comprise three phase full bridge voltage source type converter, each facies unit of described three phase full bridge voltage source type converter is made up of upper and lower two brachium pontis, each brachium pontis is by 3 sub module cascade, each submodule is by two IGBT, two anti-paralleled diodes and a decentralized capacitance composition, be connected with lumped capacitance in the DC side of three phase full bridge voltage source type converter simultaneously, its AC be connected inductance and connect, the voltage sensor be arranged on three phase full bridge voltage source type converter is connected with the AD sample circuit on dsp controller respectively with current sensor, dsp controller communicates with touch-screen, dsp controller gathers the A cross streams side voltage initial phase of three phase full bridge voltage source type converter by PLL phase-locked loop simultaneously.
Further, each brachium pontis is communicated to connect by Drive Protecting Circuit and dsp controller.
Owing to adopting technique scheme, the utility model has the advantage of: the utility model achieves and controls the balance of DSTATCOM DC voltage, guarantee the reliable and stable operation of DSTATCOM, modulated by triangular carrier phase shift SPWM simultaneously, realize higher equivalent switching frequency with lower devices switch frequency, reduce the power loss of whole device, improve efficiency, achieve electric energy-saving, and significantly eliminate harmonic wave.In addition, control circuit of the present utility model adopts outer voltage PI to control and the dead-beat control strategy of current inner loop, ensures system stability reliability service, realizes net side power factor close to 1.Verify by experiment, this decreases the idle of system and harmonic current content by DSTATCOM, greatly reduces power distribution network electrical loss, achieves electric energy-saving, and improve the quality of power supply of electrical network.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of DSTATCOM topological structure;
Fig. 2 is the schematic diagram of DSTATCOM topological structure when being connected with control circuit;
Fig. 3 is voltage vector-diagram when having DSTATCOM to compensate;
The schematic diagram of Fig. 4 control method and modulation strategy;
Fig. 5 is systems soft ware main program flow chart;
Fig. 6 is for detecting and control block diagram;
Fig. 7 is AD7656 sampling A/D chip interface;
Fig. 8 is the double-closed-loop control modular program flow chart of outer voltage current inner loop;
Fig. 9 three-phase bipolarity PWM figure;
Output current wave before Figure 10 improves;
DC capacitor voltage waveform before Figure 11 improves;
Three-phase fundamental reactive current after Figure 12 improves;
DC voltage after Figure 13 improves.
Embodiment
In order to make the utility model object, technical scheme and advantage clearly, below in conjunction with drawings and Examples, the utility model is described in further detail.
Embodiment of the present utility model: based on the control device of DSTATCOM topological structure structural representation as shown in Figures 1 and 2, comprise three phase full bridge voltage source type converter, each facies unit of described three phase full bridge voltage source type converter is made up of upper and lower two brachium pontis, each brachium pontis is by 3 sub module cascade, each submodule is by two IGBT, two anti-paralleled diodes and a decentralized capacitance composition, be connected with lumped capacitance in the DC side of three phase full bridge voltage source type converter simultaneously, its AC be connected inductance and connect, the voltage sensor be arranged on three phase full bridge voltage source type converter is connected with the AD sample circuit on dsp controller respectively with current sensor, dsp controller communicates with touch-screen, dsp controller gathers the A cross streams side voltage initial phase of three phase full bridge voltage source type converter by PLL phase-locked loop simultaneously.
Control principle of the present utility model: see Fig. 4, the alternating voltage under A, B, C three-phase natural system of coordinates, based on instantaneous reactive power theory, is become the fundamental component of the orthogonal rotation of two-phase, U by control principle of the present utility model by dq synchronous rotating angle
pccfor points of common connection voltage, under dstatcom can be operated in two kinds of mode of operations, be the reactive power of control and compensation be a given desired value, another kind determines points of common connection voltage control, and control strategy of the present utility model determines points of common connection voltage control.By carrying out the dq synchronous rotating angle of positive sequence and negative phase-sequence respectively to A, B, C three-phase alternating voltage, its access point negative sequence voltage components set-point is 0, suppression to negative sequence voltage when can realize system generation unbalanced fault, and keep positive sequence normal voltage to be rated value simultaneously.
During enforcement, first three phase full bridge voltage source type converter is built, each facies unit of three phase full bridge voltage source type converter is divided into upper and lower two brachium pontis, each brachium pontis is by 3 sub module cascade, each submodule is by two IGBT, two anti-paralleled diodes and a decentralized capacitance composition, be connected with lumped capacitance in the DC side of three phase full bridge voltage source type converter simultaneously, its AC be connected inductance and connect, the DSTATCOM topological structure of four level three-phase full-controlled bridges can be formed like this, by above topology anatomical connectivity to electrical network, program debugging is carried out under CCS environment.First adopt uncontrollable rectification that DC capacitor voltage is mentioned 537v, then adopt PWM rectification by whole for DC side to 700v.Electric capacity withstand voltage is 900v, capacity 10 microfarad.See Fig. 5, systems soft ware adopts modular design method, with the allomeric function of multiple function sub-modules in conjunction with common completion system, and the part of functions of each submodule complete independently software systems.Designed by the software systems of establishing can be divided into the function sub-modules such as detection and control module, interrupt module, systems soft ware protection module, the cooperatively interacted entirety of power distribution network three-phase static synchronous compensator of these modules controls.External AD7656 sampling A/D chip on the DSPF2812 controller development board that native system adopts, the signal be used for needed for collection, and the signal collected is carried out the digital signal that analog-to-digital conversion obtains correspondence, be input to DSPF2812 controller by I/O port bus to carry out Digital Signal Processing and produce six road pwm pulses, between every two pulses, phase difference is 60 degree.In order to avoid same bridge arm direct pass, before being input to IGBT grid voltage, upper and lower bridge arm is by a negate signal, makes pulse always present 180 degree of complementary states.Wherein, A cross streams side voltage initial phase is sampled by PLL phase-locked loop.Dsp controller communicates mutually with FPGA, transmits signals to touch-screen, can by the reactive power compensation effect of finger touch-sensitive screen contact surface directly desired by control.Adopt FPGA communication to substantially increase the dynamic responding speed of DSP, stable state accuracy also becomes better, and stability is not subject to large impact.Because system needs sampling three-phase line voltage, threephase load electric current, inverter to export 10 road signal such as three-phase current and DC side voltage of converter, be used for double-closed-loop control function, and AD7656 sampling A/D chip has possessed 12 tunnels ± 10V analog input, 4 tunnels ± 10V modulating output, ensure that the requirement of system, the waveform of sampling is good, and distortion rate is low.After transducer or the above signal of mutual inductor sample, through analog signal processing circuit, make the signal value after process between-10V to+10V to meet the incoming level requirement of sampling A/D chip AD7656 input interface, then signal is received the input interface of sampling A/D chip as shown in Figure 7.
Sampled output value, after the sampled output signal reading sampling A/D chip, according to transducer and the no-load voltage ratio of analog signal processing circuit and the coding rule of AD7656, is multiplied by a proportionality coefficient, is reduced into real signal value by sampling and data processor.
As shown in Figure 3 and Figure 6, in this program, Detecting Reactive Current adopts the ip-iq reactive current detection method based on instantaneous reactive power theory.The threephase load current instantaneous value detected is multiplied by direct transform matrix, again through low pass filter, obtain fundamental reactive current amplitude, then DC side is controlled real component as fundamental active current amplitude, be then multiplied by reverse transform matrix and obtain three-phase current command signal.
Low pass filter filtering is adopted to the reactive current component that direct transform obtains, obtains DC component wherein, i.e. fundamental reactive current amplitude in load current; DC side controls real component conduct, and carrying out inverse transformation can obtain instruction current.
See Fig. 8, control strategy adopts the double-loop control strategy of outer voltage current inner loop.Outer voltage adopts PI to control, DC-side Voltage Stabilization can be made to arrive a certain size value, current inner loop adopts track with zero error technology, what in employing, the data of one-period calculated that duty ratio is used for controlling next cycle IGBT opens the turn-off time, can accomplish from control angle the object that current automatic adaptation is followed the tracks of.See Figure 10 ~ 13, according to the data that this cycle adopts, calculate next step state of specifying that will reach and output, obtain width and the polarity of required trigger impulse, make output current trace command electric current.The polarity of internal trigger pulse of continuous adjustment each sampling period and width, just can obtain high-quality network side current waveform.Therefore, the better harmonic characterisitic of the system improved by control method of the present utility model and lower loss, thus decrease the idle of network system and harmonic current content, greatly reduce power distribution network electrical loss, achieve electric energy-saving, and improve the quality of power supply of electrical network.
Claims (2)
1. the control device based on DSTATCOM topological structure, comprise three phase full bridge voltage source type converter, each facies unit of described three phase full bridge voltage source type converter is made up of upper and lower two brachium pontis, each brachium pontis is by 3 sub module cascade, each submodule is by two IGBT, two anti-paralleled diodes and a decentralized capacitance composition, be connected with lumped capacitance in the DC side of three phase full bridge voltage source type converter simultaneously, its AC be connected inductance and connect, the voltage sensor be arranged on three phase full bridge voltage source type converter is connected with the AD sample circuit on dsp controller respectively with current sensor, dsp controller communicates with touch-screen, dsp controller gathers the A cross streams side voltage initial phase of three phase full bridge voltage source type converter by PLL phase-locked loop simultaneously.
2. the control device based on DSTATCOM topological structure according to claim 1, is characterized in that: each half brachium pontis is communicated to connect by Drive Protecting Circuit and dsp controller.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105529710A (en) * | 2015-12-01 | 2016-04-27 | 贵州大学 | Control method and device based on distribution static synchronous compensator (DSTATCOM) topological structure |
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| CN105529710A (en) * | 2015-12-01 | 2016-04-27 | 贵州大学 | Control method and device based on distribution static synchronous compensator (DSTATCOM) topological structure |
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Granted publication date: 20160413 Termination date: 20211201 |
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