CN103326363A - Current conversion device with function of multi-target load control - Google Patents
Current conversion device with function of multi-target load control Download PDFInfo
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Abstract
The invention discloses a current conversion device with a function of multi-target load control. The current conversion device with the function of multi-target load control comprises two three-phase converters, wherein one three-phase converter is connected to an alternating-current circuit in series through a coupling transformer to serve as a voltage compensation unit, the other three-phase converter is connected to the alternating-current circuit through an inductor to serve as a current compensation unit, and the two three-phase converters are connected to a common direct-current bus through a direct-current capacitor. Due to the fact that the three-phase converters are connected with the side of a system and the side of a load in series/parallel to carry out voltage compensation and current compensation, the function of multi-target load control which can achieve harmonic cancellation, reactive compensation and voltage stabilization can be achieved, quality of electric energy can be effectively improved, and loss of a power grid can be reduced.
Description
Technical field
The present invention relates to a kind of AC power convertor assembly, relate in particular to a kind of convertor assembly with the control of multiple target load.
Background technology
Power electronics becomes big technology of 21 centurys most important two together with operation control and computer technology.Yet the harmonic pollution that power electronic equipment produces has become the major obstacles that hinders Development of Power Electronic Technology.External expert has proposed the new ideas of " custom power technology " for this reason.Its purpose is exactly that distribution system is transformed into no-voltage fluctuation, the no asymmetric and flexibility power distribution network that do not have the real-time control of harmonic wave.How to realize effectively that harmonic wave control, reactive power compensation and voltage are stablized and with its safe and reliable being applied in the electrical network, generation reason, rule, characteristics and the control device thereof of various power quality problems become current research and hot of research and development problem.
Power quality control technology has obtained significant progress in recent years, and what representative and influence were wherein arranged most has Active Power Filter-APF (APF), dynamic electric voltage adjuster (DVR), a Static Var Compensator (SVG) etc.
Aspect harmonic wave control, just develop Active Power Filter-APF since the eighties in 20th century abroad, enter practical application the nineties, and as a key technology improving power supply quality, reach its maturity abroad.Only just have more than 500 APF to put into operation in Japan, its capacity has reached 60MVA.But because APF price height, therefore the hybrid filter that utilizes passive filter to reduce the active filter capacity will become the emphasis of research and be the direction of future development.Domestic APF research and development far lag behind external, and except several APF had dropped into the industry trial run, other major part still was in the development stage.
Aspect reactive power compensation, what adopt in early days is synchronous compensator and shunt capacitor.They can both compensate fixing reactive power, and the former can also carry out dynamic compensation to the reactive power that changes.But it is outmoded that the compensatory device of synchronous compensator has shown, and be difficult to safeguard; And for shunt capacitor, when in electrical network harmonic wave being arranged, parallel resonance might take place, and harmonic wave is amplified, the accident that therefore capacitor burns happens occasionally.And use the Static Var Compensator (SVC) of thyristor because the SVC response speed is slow, suppress flickering and be difficult to reach 50%, and its on-off action has also been brought a large amount of harmonic waves.Compare with SVC, adopt the Static Var Compensator of PWM control technology to have rapid dynamic response speed, offset current and do not rely on system voltage, harmonic wave and suppress that ability is strong, to suppress voltage effective (20% below) and floor space only be advantage with capacity SVC device 50%, and obtained application more and more widely.From 1986 to 1999, Mitsubishi dropped into the Static Var Compensator that 20 capacity do not wait from 0.1～60MVar at least and has been applied in iron company, electric railway, hydroelectric station, transformer station etc.But Static Var Compensator can only compensating power, and it is single that function shows slightly.
The dynamic electric voltage adjuster is to guarantee the very effective series compensation device of sensitive load power supply quality at present, and this device can be in Millisecond falls voltage and compensates to normal value, guarantees that the sensitive load supply power voltage is not subjected to the influence of system voltage fault.At present the dynamic electric voltage adjuster has significant effect aspect the power supply quality that voltage falls, improves large-scale synthesis sensitivity industrial load eliminating.But because the dynamic electric voltage adjuster only just provides load to satisfy the required power consumption of normal voltage when voltage falls, though can solve the voltage sag problem, its efficient is than higher, and its expense is than higher, the structure more complicated gets up to have certain degree of difficulty so promote.
Therefore, existing equipment (APF, DVR, SVG) can only be optimized at a certain technical indicator of the quality of power supply, can't realize multi objective control, function is single relatively, and the simple stack of three's function is not only caused promoting limited because cost is too high, also will influence the normal operation of individual equipment because of influencing each other between the equipment.Therefore be necessary to provide the convertor assembly with the control of multiple target load, on the basis that guarantees equipment performance, realized multi objective control, have multiple functional, cost is controlled, easy for installation, characteristics such as operation maintenance is simple.
Summary of the invention
Technical problem to be solved by this invention provides a kind of convertor assembly with the control of multiple target load, has the stable multiple target load controlling function of harmonic wave elimination, reactive power compensation and voltage, be applicable to the energy-conservation technological transformation of power distribution network, can effectively improve the quality of power supply, reduce grid loss.
The present invention solves the problems of the technologies described above the technical scheme that adopts to provide a kind of convertor assembly with the control of multiple target load, comprise two 3-phase power converters, wherein, a 3-phase power converter is connected in series on the alternating current circuit as the voltage compensation unit by coupling transformer, another 3-phase power converter is connected on the alternating current circuit as the current compensation unit by inductance, and described two 3-phase power converters are connected on the common DC bus by dc capacitor.
The above-mentioned convertor assembly with the control of multiple target load, wherein, described 3-phase power converter is the inverter that six switching tubes of three groups of brachium pontis constitute, every group of brachium pontis comprises two switching tubes that are cascaded, link to each other with the alternating current circuit by inductance L in the middle of every group of brachium pontis, described inductance L constitutes passive filter with the capacitor C that is connected in parallel on the brachium pontis two ends.
The above-mentioned convertor assembly with the control of multiple target load, wherein, the output voltage of described alternating current circuit links to each other with dsp controller by the three-phase alternating voltage Acquisition Circuit, and the output voltage of described common DC bus links to each other with dsp controller by the direct voltage Acquisition Circuit; Described dsp controller produces the PWM trigger impulse, drives the turn-on and turn-off of removing the control switch pipe after amplify on the Shen road through buffering.
The above-mentioned convertor assembly with the control of multiple target load, wherein, described dsp controller sends the locking pulse on-off switching tube after detecting overvoltage, overcurrent or overload signal.
The present invention contrasts prior art following beneficial effect: the convertor assembly with the control of multiple target load provided by the invention, by carrying out the voltage and current compensation respectively in system side and load side series/parallel 3-phase power converter, thereby realize harmonic wave elimination, reactive power compensation and the stable multiple target load controlling function of voltage, effectively improve the quality of power supply, reduce grid loss.
Description of drawings
Fig. 1 is that the installation of the right also formula current transformer of left side string connects topological diagram;
Fig. 2 is that a left side and right string data current transformer are installed the connection topological diagram;
Fig. 3 is that installation is connected topological diagram to another kind of two series converters with passive filter;
Fig. 4 has the circuit block diagram of the convertor assembly of multiple target load control for the present invention;
Fig. 5 is the circuit connection diagram of 3-phase power converter among Fig. 4;
The control that Fig. 6 uses for the present invention has the circuit block diagram of dsp controller of the convertor assembly of multiple target load control.
Among the figure:
1 coupling transformer, 2 three-phase commutation bridge band resistance sense loads, 3 3-phase power converters
4LC passive filter 5 common DC bus and electric capacity
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Because APF can solve the dynamic current quality problems of load, DVR can resolution system the dynamic voltage quality problem, if APF and DVR are combined, can constitute then simultaneously that bucking voltage is fallen, skyrocketed, instantaneous voltage interrupts, three-phase imbalance compensation, current harmonics compensation and reactive power compensation etc., the proof load terminal voltage is the pure sine wave of standard class and constant frequency, guarantees that the grid side electric current is and the synchronous pure sine wave of line voltage.
Installation site according to quality of power supply compensating unit is different with mounting means, and following three kinds of topological structures are generally arranged:
Topological structure one is the right and mode of left side string, as shown in Figure 1.Adopt this mode to be formed by a pair of series/parallel current transformer usually, share a dc energy storage link.During work, current transformer in parallel is connected to load side, is mainly used in compensation harmonic and reactive current, and it is constant to keep two direct voltages between the current transformer simultaneously; Series converter is connected to system side, has the tie point of keeping voltage, bucking voltage flickering and asymmetric function.
Topological structure two is a left side and right string mode, as shown in Figure 2.On structure, except the series/parallel current transformer was arranged, in load side also and connect a LC passive filter, and current transformer in parallel was connected to system side.On the function of device, series converter not only plays buffer action to harmonic wave during operation, is also bearing issuable series/parallel resonance between resistance LC passive filter and the system impedance simultaneously.Current transformer in parallel only is used for keeping the magnitude of voltage of DC power supply between two electric current devices, make it in compensation process even a large amount of meritorious flow to or when flowing out series converter are being arranged, it is constant that DC power supply voltage keeps, and the required current transformer capacity in parallel of this structure is very little.
Topological structure three is made of series converter and a passive filter of two low capacities, as shown in Figure 3, one of them current transformer be connected in parallel on load side after passive filter is connected, this structure is mainly used in the system based on 5 times and 7 subharmonic.
Convertor assembly with the control of multiple target load provided by the invention preferably adopts the right and type topological structure of left side string, as shown in Figure 4, is specially the three-phase three-wire system topological structure, is connected to common DC bus and electric capacity 5 by two 3-phase power converters 3; The 3-phase power converter 3 of left side series connection part is the voltage compensation unit, is the inverter that is made of 6 switching tubes of three brachium pontis, is connected in series on the alternating current circuit by a coupling transformer 1, is used for improving various quality of voltage problems; The 3-phase power converter 3 of right side part in parallel is the current compensation unit, also is to be made of 6 switching tubes of three brachium pontis, is connected on the alternating current circuit by inductance, is used for improving the electric current quality problems, and inductance herein also can be directly as the inductance L in the lc circuit; Mid portion is dc bus and electric capacity 5, constitutes the DC link of two voltage type PWM current transformers about connecting, as the medium of energy exchange.In the structure, the lc circuit at two ends constitutes passive filter, is used for eliminating the switching frequency harmonic wave of two current transformer outputs.Switching tube can be selected IGBT (Insulated Gate Bipolar Transistor) for use, insulated gate bipolar transistor, the compound full-control type voltage driven type power semiconductor that IGBT is made up of BJT (double pole triode) and MOS (insulating gate type field effect tube), have the advantage of low conduction voltage drop two aspects of the high input impedance of MOSFET and GTR concurrently, driving power is little and saturation pressure reduces.Be fit to very much to be applied to direct voltage and be fields such as 600V and above converter system such as alternating current machine, frequency converter, Switching Power Supply, lighting circuit, traction transmission.
Convertor assembly with the control of multiple target load provided by the invention, by the electric current and voltage that inserts dot system side and load side is sampled, obtain the running status of system, get auto levelizer control target after comprehensive judgement and the fusion, realization is to the state-detection of load and the purpose of multi objective control, makes device have better overall compensation effect, dynamic responding speed, bigger advantages such as expansion capacity faster.Series/parallel current transformer in the main circuit, filter circuit, series connection side transformer, side in parallel connect inductance and dc capacitor etc.Whether its parameter is chosen proper, has determined that not only can system operate as normal, and influences the cost of compensation performance and whole device.Concrete parameter can preferably set as follows: power frequency 50Hz, phase voltage effective value are 220V; Bearing power is 30kW, and load phase current first-harmonic effective value is 50A, and power factor is 0.866; Dc voltage is 700V; The switching tube frequency is 12.8K.
For series converter and current transformer in parallel, the basic topological structure of its power converter unit is identical, as shown in Figure 5, described 3-phase power converter is the inverter that six switching tubes of three groups of brachium pontis constitute, every group of brachium pontis comprises two switching tubes that are cascaded, as S1 and S4, and S3 and S6 and S5 and S2, link to each other with the alternating current circuit by inductance L in the middle of every group of brachium pontis, described inductance L constitutes passive filter with the capacitor C that is connected in parallel on the brachium pontis two ends.
Convertor assembly with the control of multiple target load provided by the invention, the output voltage of described alternating current circuit links to each other with dsp controller by the three-phase alternating voltage Acquisition Circuit, and the output voltage of described common DC bus links to each other with dsp controller by the direct voltage Acquisition Circuit; Described dsp controller produces the PWM trigger impulse, the turn-on and turn-off of removing the control switch pipe after buffering drive circuit amplifies.The start and stop of described dsp controller by obtaining online detection and administration module and signal acquisition module and transmit, protection, voltage, current signal etc. produce and the pulse of control current transformer device driving switch device, make equipment produce required electric current and idle.The TMS320F28335 type digital signal processor that main control chip adopts TI company to release, it is a TMS320C28X series Floating-point DSP controller, compare with fixed DSP in the past, the precision height of this device, cost is low, and power consumption is little, the performance height, peripheral hardware integrated level height, data and procedure stores amount are big, and A/D conversion is more accurate fast etc.
TMS320F28335 has the high speed processing ability of 150MHz, possess 32 floating point processing units, 6 DMA passages are supported ADC, McBSP and EMIF, and nearly 18 tunnel PWM output is arranged, wherein have 6 the tunnel to be the distinctive more high-precision PWM output of TI (HRPWM), 12 16 passage ADC.Have benefited from its Float Point Unit, the user can write control algolithm fast and need not to expend too much time and efforts in the operation of processing decimal, thereby simplifies software development, shortens the construction cycle, reduces development cost.
The electric current and voltage of described dsp controller is sampled and is monitored as follows:
1) produce to drive the IGBT pulse: produce the PWM pulse of setting out by result of calculation and control mode, after buffering drive circuit amplifies, go to control the turn-on and turn-off of IGBT, make equipment finish the function of harmonic wave control and compensating power.
2) obtain accurate and stable synchronized signal: obtain the electrical network signal of telecommunication from a wherein phase voltage signal of electrical network, and obtain synchronous pulse signal through shaping circuit, phase-locked loop circuit, make equipment can cross acquisition 0 angle position accurately.
3) real time communication function: be connected with external equipment by CAN interface, 232 interfaces, can received current and idle given, and produce given electric current and reactive power, and the transmission operating state.Comprise that current tracking provides the leading or hysteresis reactive current of regulation, control dc capacitor voltage to be stabilized in load voltage value.
4) defencive function: when equipment operates under overvoltage, overcurrent, overload or other abnormal states, controller should send locking pulse and block IGBT, and equipment is quit work.
The signal conditioning circuit part mainly comprises three-phase alternating voltage signal acquisition circuit and d. c. voltage signal Acquisition Circuit.The three-phase alternating voltage signal acquisition circuit adopts the LV25-P transducer of LEM company to sample, no-load voltage ratio situation according to its 10mA: 25mA, consider that voltage maximum fluctuation scope is ± 30%, getting former limit resistance is 2 20K Ω/2W resistance series connection, and the secondary sampling resistor is 200 Ω/0.5W.Sampled signal is sent out big and add circuit is modulated in 0～4V scope through direction, delivers to the A/D chip after filtering.
The d. c. voltage signal Acquisition Circuit adopts the LV25-P transducer of LEM company to sample, and according to the no-load voltage ratio situation of its 10mA: 25mA, getting former limit resistance is 4 20K Ω/2W resistance series connection, and the secondary sampling resistor is 200 Ω/0.5W.Sampled signal is sent out big and add circuit is modulated in 0～4V scope through direction, delivers to the A/D chip after filtering.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (4)
1. one kind has the convertor assembly that the multiple target load is controlled, it is characterized in that, comprise two 3-phase power converters, wherein, a 3-phase power converter is connected in series on the alternating current circuit as the voltage compensation unit by coupling transformer, another 3-phase power converter is connected on the alternating current circuit as the current compensation unit by inductance, and described two 3-phase power converters are connected on the common DC bus by dc capacitor.
2. the convertor assembly with multiple target load control as claimed in claim 1, it is characterized in that, described 3-phase power converter is the inverter that six switching tubes of three groups of brachium pontis constitute, every group of brachium pontis comprises two switching tubes that are cascaded, link to each other with the alternating current circuit by inductance L in the middle of every group of brachium pontis, described inductance L constitutes passive filter with the capacitor C that is connected in parallel on the brachium pontis two ends.
3. the convertor assembly with multiple target load control as claimed in claim 2, it is characterized in that, the output voltage of described alternating current circuit links to each other with dsp controller by the three-phase alternating voltage Acquisition Circuit, and the output voltage of described common DC bus links to each other with dsp controller by the direct voltage Acquisition Circuit; Described dsp controller produces the PWM trigger impulse, the turn-on and turn-off of removing the control switch pipe after buffering drive circuit amplifies.
4. the convertor assembly with the control of multiple target load as claimed in claim 3 is characterized in that described dsp controller sends the locking pulse on-off switching tube after detecting overvoltage, overcurrent or overload signal.
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Cited By (3)
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| CN103560522A (en) * | 2013-11-13 | 2014-02-05 | 国网上海市电力公司 | Dynamic voltage reactive compensation device |
| CN103560521A (en) * | 2013-11-13 | 2014-02-05 | 国网上海市电力公司 | Controller for dynamic voltage reactive compensator |
| CN103701127A (en) * | 2013-12-27 | 2014-04-02 | 国电南京自动化股份有限公司 | Novel active power filtering device and control method thereof |
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Owner name: STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: SHANGHAI CHUXIN ELECTRIC POWER TECHNOLOGY CO., LTD. Effective date: 20131008 Owner name: STATE GRID SHANGHAI ELECTRIC POWER COMPANY SHANGHA Effective date: 20131008 |
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Effective date of registration: 20131008 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: State Grid Shanghai Municipal Electric Power Company Applicant after: Shanghai Chuxin Electronic Power Science & Technology Co., Ltd. Address before: 201614, No. 488, Guanghua Road, little town, Shanghai, Kunshan, 5, 101, China, Songjiang District Applicant before: Shanghai Chuxin Electronic Power Science & Technology Co., Ltd. |
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Application publication date: 20130925 |