CN102882219A - Railway power supply system comprehensive electric energy quality treatment device and method thereof - Google Patents
Railway power supply system comprehensive electric energy quality treatment device and method thereof Download PDFInfo
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Abstract
The invention discloses a railway power supply system comprehensive electric energy quality treatment device and method thereof. A static var generator comprises a power unit and an electric reactor and is connected with a pre-charge loop; the power unit is connected in series with the electric reactor; and the pre-charge loop is connected with a power side of a power grid through an AC (alternating current) switch. A thyristor switch electric reactor comprises more than two electric reactor branches; each electric reactor branch comprises an electric reactor and an electronic switch; the electric reactor is connected in series with the electronic switch; and the electric reactor branch is connected in parallel on a load side of the power grid through the electronic switch. A control protection system controls the investment of the electric reactor branches to compensate for the reactive power and controls the static var generator to compensate for the reactive power. The device and method disclosed by the invention overcome the technical shortcomings that the cost is high by using a static var generator only and the thyristor switch electric reactor can not realize continuous compensation, and also consider the advantages of high regulation speed, wide operation range, reactive power compensation and harmonic wave treatment of the static var generator and large capacity and low cost of thyristor switch electric reactor.
Description
Technical field
The present invention relates to field of power electronics, be specifically related to a kind of being applied in the electric power supply system for subway, can comprehensive compensation power quality controlling device and the method thereof of idle and filtering harmonic wave.
Background technology
Along with China's city size and urgent develop rapidly of building, urbanization process is progressively being accelerated, personnel's trip and the interflow of commodities are frequent, the transport need sharp increase, urban transportation imbalance between supply and demand day is becoming tight, and traffic above-ground can't adapt to the growing freight volume demand that is produced by economic activity and people's lives.Subway is developed rapidly in each big and medium-sized cities of China as present one of most economical and efficient urban transportation tool in the world.At present, existing 33 plans that the city has proposed to build city underground in the whole nation wherein have 28 cities to build.
China's subway mainly adopts centralized power supply system, is comprised of main transformer station, traction substation, several parts of commutation system and power and lighting system.Because electric power supply system for subway all adopts cable to connect, its charging capacitive reactive power is large, adds that the fluctuation of traction load itself is large, brings to urban distribution network that power factor is low, idle to be sent and a series of unfavorable factors such as resonance overvoltage.Subway is among the densely populated city, and in a single day public electric wire net has an accident, and can bring very large impact to whole urban electric power supply and social stability.
At present, the mode that solves the power quality problems such as the idle and harmonic wave of electric power supply system for subway mainly contains fixedly shunt reactor FR, thyristor-controlled reactor TCR, static reacance generator SVG, Active Power Filter-APF APF etc.Wherein can only to compensate fixed inductive idle for FR, produced easily to mend or owe to mend poor effect.TCR can regulate continuously but itself produces harmonic wave, and loss is larger.APF is main only to be suppressed harmonic wave, compensates 19 times with interior each harmonic.Along with the fast development of power electronics full-controlled switch device, the static passive compensation device of nature commutation convertor circuit has appearred adopting in recent years, be commonly referred to static reacance generator SVG.Compare with traditional SVC device take TCR as representative, the governing speed of SVG is faster, and range of operation is wider, not only can also administer harmonic wave by compensating reactive power, but cost is higher.The while electric power supply system for subway is mainly take capacitive reactive power as main, so this paper proposes a kind of comprehensive electric energy quality improvement method based on static reacance generator SVG+ thuristor throw-in and throw-off reactor TSR.Through practical application and expert evaluation, the method is the comprehensive electric energy quality improvement method in the electric power supply system for subway of being applied to of present most economical practicality.The content relevant with present patent application mainly contains with Publication about Document in the middle of prior art:
Document one is better than be published in December, 2011, the paper of the 24th volume " research of subway line Scheme of Reactive Power Compensation " for Gu Yanqi, Duan Yong " electromechanical engineering " the 6th phase.The document has proposed the fixedly compensation scheme of shunt reactor of a kind of SVG+, but this scheme is fixing shunt reactor, can not switching, and SVG still needs to dispose larger capacity.
Document two is published in " low-voltage electrical apparatus " paper of the 12nd phase " dynamic reactive compensation device is in the application study of subway main transformer station " for Duan Lixin in December, 2009.The document mainly compares centralized compensation, subregion centralized compensation, three kinds of compensation schemes of distributed compensation, does not propose concrete power quality controlling scheme.
Document three is that Zhuzhou National Engineering Research Center of Converters Co., Ltd. applied on 09 08th, 2010, and open on December 22nd, 2010, and publication number is the Chinese invention patent application " a kind of mixed power quality treatment method " of CN101924371A.This disclosure of the Invention a kind of mixed power quality treatment method, at active part, the SVG of at least two groups and the APF of at least two groups are connected on the three phase network by the transformer isolation mode, the main compensating reactive power electric current of SVG wherein, APF compensation harmonic electric current falls when serious APF at voltage and also can be used as reacance generator and support voltage with the deficiency that remedies the SVG capacity; At passive part, to be combined into jumbo direct hanging type SVC by TCR and TSC, FC is directly connected to three phase network and carries out reactive power compensation, and pass through the asymmetric control of the three-phase of TCR, compensate three-phase is asymmetric, provide large capacity capacitive reactive power by thyristor switchable capacitor TSC, FC provides the low capacity reactive power by the fixed capacity compensation, by the double main subharmonic filter branch of being thyristor-controlled reactor TCR of fixed capacity compensation FC, be used for electrical energy system is coordinated comprehensively.The shortcoming of the method is not given full play to the characteristic that SVG can the filtering harmonic wave, but has increased the APF device, has increased floor space and cost, has brought complexity to control yet.SVG need to be connected to electrical network by transformer simultaneously, has increased floor space and loss, has also limited the capacity of SVG.
Summary of the invention
The purpose of this invention is to provide a kind of electric power supply system for subway comprehensive electric energy quality controlling device and method thereof, overcome independent use static reacance generator (SVG, Static Var Generator) the high and thuristor throw-in and throw-off reactor (TSR of cost, Thyristor switched Reactor) technological deficiency that can not Continuous Compensation takes into account simultaneously that the static reacance generator governing speed is fast, range of operation is wide, compensating reactive power is held concurrently and administers harmonic wave and thuristor throw-in and throw-off reactor capacity is large, cost is low advantage.
In order to realize the foregoing invention purpose, the present invention specifically provides a kind of technic relization scheme of electric power supply system for subway comprehensive electric energy quality controlling device, a kind of electric power supply system for subway comprehensive electric energy quality controlling device comprises: static reacance generator, thuristor throw-in and throw-off reactor, precharge loop, control protection system and alternating-current switch; Static reacance generator comprises power cell and reactor, and static reacance generator links to each other with the precharge loop, and power cell is connected with reactor, and the precharge loop is again by alternating-current switch and the mains side that is connected to electrical network; The thuristor throw-in and throw-off reactor comprises two groups of above Reactor Branchs, and Reactor Branch comprises reactor and electronic switch, and reactor is connected with electronic switch, and Reactor Branch is connected in parallel on the load-side of electrical network by electronic switch; The control protection system links to each other with static reacance generator, thuristor throw-in and throw-off reactor respectively, controls the input of Reactor Branch in the thuristor throw-in and throw-off reactor with compensating reactive power, and control static reacance generator compensating reactive power.
As the further improvement of a kind of electric power supply system for subway comprehensive electric energy quality of the present invention controlling device technical scheme, reactor links to each other with the power cell of static reacance generator and the Reactor Branch of thuristor throw-in and throw-off reactor respectively; The precharge loop comprises charging resistor and the 3rd circuit breaker, and the 3rd circuit breaker is connected in parallel on the two ends of charging resistor; Alternating-current switch comprises the first circuit breaker, the second circuit breaker, the first isolating switch and isolating switch; The precharge loop links to each other with electrical network by the first circuit breaker, the first isolating switch successively; After the isolating switch of the Reactor Branch of thuristor throw-in and throw-off reactor by separately connects, link to each other with electrical network by the second circuit breaker again.
As the further improvement of a kind of electric power supply system for subway comprehensive electric energy quality of the present invention controlling device technical scheme, the control protection system comprises that A/D sample circuit, Digital Analog Hybrid Circuits, PWM form circuit, photoelectric isolating circuit, IGBT driver module and protection and logic module; The A/D sample circuit gathers analog signals, calculating through Digital Analog Hybrid Circuits, one the tunnel exports protection and logic module to, and protection and logic module output signal to each switching device in the electronic switch of the power cell of static reacance generator and Reactor Branch again; Another road signal forms circuit output PWM ripple through PWM, and process photoelectric isolating circuit and IGBT driver module export the power cell of static reacance generator to again.
As the further improvement of a kind of electric power supply system for subway comprehensive electric energy quality of the present invention controlling device technical scheme, Digital Analog Hybrid Circuits comprises FPGA, DSP, dual port RAM, algorithm DSP module and algorithm FPGA module; FPGA will transfer to DSP alternately from the input signal of A/D sample circuit; Dual port RAM is responsible for transmitting the interactive information between DSP and the algorithm DSP module; DSP is responsible for carrying out malfunction monitoring and logic control is processed, and exports control signal by protection and logic module to electronic switch; The algorithm DSP module is responsible for carrying out algorithm process, and forms circuit output PWM ripple by algorithm FPGA module to PWM.
As the further improvement of a kind of electric power supply system for subway comprehensive electric energy quality of the present invention controlling device technical scheme, the A/D sample circuit gathers the current i of load
LWith through the current i of thuristor throw-in and throw-off reactor compensation back loading '
L, and line voltage U; Digital Analog Hybrid Circuits is according to the current i of load
L, line voltage U, and target power factor cos φ calculates the reactive capability that load need to compensate, and sends different switching instructions according to the amount of capacity of thuristor throw-in and throw-off reactor and static reacance generator to the electronic switch of the Reactor Branch of thuristor throw-in and throw-off reactor again.
Further improvement as a kind of electric power supply system for subway comprehensive electric energy quality of the present invention controlling device technical scheme; when the thuristor throw-in and throw-off reactor comprised two groups of Reactor Branchs, the control protection system was determined the compensating instruction of thuristor throw-in and throw-off reactor according to following rule
Determine the group number of Reactor Branch switching, and send trigger impulse to the thyristor groups of electronic switch:
As Q≤Q
R/ 2 o'clock,
Each branch road of thuristor throw-in and throw-off reactor is not all thrown 0～Q
R/ 2 are compensated by static reacance generator;
When-Q
R/ 2＜Q≤0 o'clock,
Each branch road of thuristor throw-in and throw-off reactor is not all thrown-Q
R/ 2～0 is compensated by static reacance generator;
When-Q
R＜Q≤-Q
R/ 2 o'clock,
The thuristor throw-in and throw-off reactor drops into one group of branch road, 0～Q
R/ 2 are compensated by static reacance generator;
When-3Q
R/ 2＜Q≤-Q
RThe time,
The thuristor throw-in and throw-off reactor drops into one group of branch road ,-Q
R/ 2～0 is compensated by static reacance generator;
When-2Q
R＜Q≤-3Q
R/ 2 o'clock,
The thuristor throw-in and throw-off reactor drops into two groups of branch roads, 0～Q
R/ 2 are compensated by static reacance generator;
When-5Q
R/ 2＜Q≤-2Q
RThe time,
The thuristor throw-in and throw-off reactor drops into two groups of branch roads ,-Q
R/ 2～0 is compensated by static reacance generator; Wherein, Q
RCompensation capacity for every group of branch road of thuristor throw-in and throw-off reactor.
Further improvement as a kind of electric power supply system for subway comprehensive electric energy quality of the present invention controlling device technical scheme; the output current of the power cell of static reacance generator enters Digital Analog Hybrid Circuits by the A/D sample circuit; after process algorithm DSP module calculates the modulation ratio M and phase place α of sinusoidal modulation signal; further obtain the three-phase PWM modulation signal; three-phase PWM modulation signal data are sent to algorithm FPGA module; and periodic refreshing three-phase PWM modulation signal data, then relatively produce pwm signal with the phase shift triangular carrier and export PWM formation circuit to.
As the further improvement of a kind of electric power supply system for subway comprehensive electric energy quality of the present invention controlling device technical scheme, the algorithm DSP module comprises idle detection module, abc/dq0 conversion module, dc voltage regulation module and modulation ratio and phase angle calculating module; The reactive current i that the output current signal of the power cell of static reacance generator obtains through the abc/dq0 conversion module
qWith the idle reference current that obtains by idle detection module
Carry out PI and regulate active current i
dWith the meritorious reference current that obtains by direct current voltage regulator
Carrying out PI regulates; Utilization is to the voltage U of power supply
SCarry out the voltage signal V that obtains after the abc/dq0 conversion
SdBe connected reactance ω L to i
q,
Id,
Carry out the PI decoupling zero, obtain the dq coordinate components that static reacance generator need to send
The dq coordinate components that module is sent according to the static reacance generator needs is calculated at modulation ratio and phase angle
The dc voltage value V of the power cell cascade type inverter that gathers
Dc, line voltage phase angle θ and power cell in the unit number N of every mutually cascaded inverter calculate modulation ratio M and the phase angle [alpha] of sinusoidal modulation signal.
As the further improvement of a kind of electric power supply system for subway comprehensive electric energy quality of the present invention controlling device technical scheme, static reacance generator adopts cascade connection multi-level type static reacance generator, and power cell adopts heterogeneous cascaded inverter.
The present invention also specifically provides a kind of technic relization scheme of electric power supply system for subway comprehensive electric energy quality improvement method in addition, and a kind of electric power supply system for subway comprehensive electric energy quality improvement method may further comprise the steps:
The control protection system gathers electric current and the line voltage of load; At first according to electric current and the line voltage of load, calculate the reactive capability that load need to compensate, then by send different switching instructions to electronic switch, two groups of above Reactor Branchs of control thuristor throw-in and throw-off reactor carry out switching, and the large capacity of compensation network is idle;
The control protection system gathers the output current of the power cell of static reacance generator; obtain the three-phase PWM modulation signal through computing; obtain more afterwards driving the pwm signal of static reacance generator power cell with the phase shift triangular carrier, control static reacance generator power cell compensation thuristor throw-in and throw-off reactor is uncompensated idle.
Administer the further improvement of method and technology scheme as a kind of electric power supply system for subway comprehensive electric energy quality of the present invention, the A/D sample circuit of control protection system gathers load current and mains voltage signal, through the calculating of Digital Analog Hybrid Circuits, thuristor throw-in and throw-off reactor switching control signal is exported to each switching device in the electronic switch of the power cell of static reacance generator and Reactor Branch by protection and logic module; The A/D sample circuit of control protection system gathers the output current signal of the power cell of static reacance generator; calculating through Digital Analog Hybrid Circuits; form circuit output PWM ripple by PWM, export control signal in the static reacance generator power cell switching device through photoelectric isolating circuit and IGBT driver module again.
As the further improvement of a kind of electric power supply system for subway comprehensive electric energy quality improvement of the present invention method and technology scheme, the A/D sample circuit gathers the current i of load
LWith through the current i of thuristor throw-in and throw-off reactor compensation back loading '
L, and line voltage U; Digital Analog Hybrid Circuits is according to the current i of load
L, line voltage U, and target power factor cos φ calculates the reactive capability Q that load need to compensate, and then sends different switching instructions according to the amount of capacity of thuristor throw-in and throw-off reactor and static reacance generator to the electronic switch of the Reactor Branch of thuristor throw-in and throw-off reactor.
As the further improvement of a kind of electric power supply system for subway comprehensive electric energy quality improvement of the present invention method and technology scheme, the output current signal of the power cell of the static reacance generator reactive current i that conversion obtains through abc/dq0
qWith the idle reference current that obtains by idle detection
Carry out PI and regulate active current i
dWith the meritorious reference current that obtains by dc voltage regulation
Carrying out PI regulates; Utilization is to the voltage U of power supply
SCarry out the voltage signal V that obtains after the abc/dq0 conversion
SdBe connected reactance ω L to i
q,
Id,
Carry out the PI decoupling zero, obtain the dq coordinate components that static reacance generator need to send
And according to the dc voltage value V of the power cell cascade type inverter that gathers
Dc, line voltage phase angle θ and power cell in the unit number N of every mutually cascaded inverter calculate modulation ratio M and the phase angle [alpha] of sinusoidal modulation signal.
By implementing the technical scheme of the invention described above a kind of electric power supply system for subway comprehensive electric energy quality controlling device and method thereof, have following technique effect:
(1) the present invention adopts cascade connection multi-level type static reacance generator, with respect to multiplex and clamped multi-level structure, be easy to modularization and expansion on the cascade connection multi-level type static reacance generator structure, has the voltage redundancy properties, be convenient to realize soft switch technique, control method is simple, is more perfect inverter;
(2) the present invention has changed original static reacance generator and thuristor throw-in and throw-off reactor and the mode used separately only occurred; By the Collaborative Control of control system, by the most first-harmonic capacitive reactive power of thuristor throw-in and throw-off reactor compensating load, static reacance generator is the idle and harmonic wave of compensate for residual then; So both having overcome the thuristor throw-in and throw-off reactor can only have level to regulate the defective of reactive power compensation, has solved again the high problem of large volume static reactive generator cost; Simultaneously, bring into play thuristor throw-in and throw-off reactor compensation capacity greatly and the characteristics of static reacance generator Continuous Compensation, realized the target to the big capacity load Continuous Compensation;
(3) power that active part needs among the present invention is little, therefore can not increase a lot of costs, but can greatly improve compensation effect, has improved the performance of whole controlling device.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the connecting structure for electrical equipment schematic diagram of a kind of specifically execution mode of electric power supply system for subway comprehensive electric energy quality controlling device of the present invention;
Fig. 2 is the structural principle block diagram of a kind of specifically execution mode control of electric power supply system for subway comprehensive electric energy quality controlling device of the present invention protection system;
Fig. 3 is system's control structure block diagram of a kind of specifically execution mode of electric power supply system for subway comprehensive electric energy quality controlling device of the present invention;
Among the figure: 1-power cell, 2-electronic switch, 3-precharge loop; 4-controls protection system, 5-load, 6-power supply; the idle detection module of 11-, 12-abc/dq0 conversion module, 13-dc voltage regulation module; module, 41-A/D sample circuit, 42-Digital Analog Hybrid Circuits are calculated in 14-modulation ratio and phase angle; 43-PWM forms circuit; the 44-photoelectric isolating circuit, 45-IGBT driver module, 46-protection and logic module; 421-FPGA; 422-DSP, 423-dual port RAM, 424-algorithm DSP module; 425-algorithm FPGA module; the 461-CPLD protective circuit, 462-CPLD logical circuit, 463-numeral I/O circuit.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
To shown in the accompanying drawing 3, provided the specific embodiment of the present invention's a kind of electric power supply system for subway comprehensive electric energy quality controlling device and method thereof such as accompanying drawing 1, the invention will be further described below in conjunction with the drawings and specific embodiments.
The present invention's a kind of electric power supply system for subway comprehensive electric energy quality controlling device and method thereof, adopt static reacance generator (SVG, Static Var Generator) and thuristor throw-in and throw-off reactor (TSR, Thyristorswitched Reactor) method that combines, solve that power factor is low, idle to be sent and a series of power quality problems such as harmonic wave comprehensively, avoid these power quality problems to bring harm to electrical network, guarantee the reliability of electric power supply system for subway.
For the characteristics of electric power supply system for subway, the cable idle impact of charging is large, and night, power factor was low, and reactive power fluctuation is large, and these power quality problems cause the present situations such as very large reactive loss, voltage fluctuation and flickering.Deficiency in view of the prior art scheme, the present invention adopts harmonic wave, the Reactive-current General Compensation mode that static reacance generator+the thuristor throw-in and throw-off reactor combines, not only can overcome the shortcoming that the high and thuristor throw-in and throw-off reactor of independent use static reacance generator cost can not Continuous Compensation, and can draw the advantage that the static reacance generator governing speed is fast, range of operation is wide, compensating reactive power is held concurrently the improvement harmonic wave and thuristor throw-in and throw-off reactor capacity is large, cost is low, to obtain effective, the lower-cost new electric energy quality controlling device of a kind of comprehensive compensation and method thereof.
The embodiment of a kind of electric power supply system for subway comprehensive electric energy quality controlling device as shown in Figure 1 comprises: static reacance generator, thuristor throw-in and throw-off reactor, precharge loop 3, control protection system 4 and alternating-current switch.Static reacance generator comprises power cell 1 and reactor L10, and static reacance generator links to each other with precharge loop 3, and power cell 1 is connected with reactor L10, and precharge loop 3 is again by alternating-current switch and power supply 6 one sides that are connected to the electrical network front end.The thuristor throw-in and throw-off reactor comprises two groups of above Reactor Branchs, and the Reactor Branch quantity that specifically comprises can comprehensively be determined according to electric power supply system for subway compensating reactive power demand, reactive compensation adjusting precision and response speed.Reactor Branch comprises reactor L11～L1n and electronic switch 2, and reactor L11～L1n connects with electronic switch 2, and Reactor Branch is connected in parallel on rightmost load 5 one sides of electrical network by electronic switch 2, and load 5 is nonlinear load.Control protection system 4 links to each other with static reacance generator, thuristor throw-in and throw-off reactor respectively, controls the input of Reactor Branch in the thuristor throw-in and throw-off reactor with compensating reactive power, and control static reacance generator compensating reactive power.Wherein, static reacance generator further adopts cascade connection multi-level type static reacance generator, and power cell 1 further adopts heterogeneous cascaded inverter.
The basic functional principle of electric power supply system for subway comprehensive electric energy quality controlling device of the present invention is: major part is idle to be compensated by the thuristor throw-in and throw-off reactor, and the idle and harmonic wave that the thuristor throw-in and throw-off reactor has not compensated is compensated by static reacance generator.Static reacance generator can be exported from the perception to the capacitive adjustable idle continuously, and whole electric power supply system for subway just can carry out Continuous Compensation to reactive power, simultaneously can also the filtering harmonic wave.Like this, the performance of whole electric power supply system for subway is better than using separately the thuristor throw-in and throw-off reactor.And the capacity of static reacance generator can reduce, and greatly reduces cost.
Reactor links to each other with the power cell of static reacance generator and the Reactor Branch of thuristor throw-in and throw-off reactor respectively.Precharge loop 3 comprises charging resistor R and the 3rd circuit breaker Q F11, and the 3rd circuit breaker Q F11 is connected in parallel on the two ends of charging resistor R.Alternating-current switch comprises the first circuit breaker Q F1, the second circuit breaker Q F2, the first isolating switch QS1 and isolating switch QS11～QS1n.Precharge loop 3 links to each other with electrical network by the first circuit breaker Q F1, the first isolating switch QS1 successively.The Reactor Branch of thuristor throw-in and throw-off reactor by separately after isolating switch QS11～QS1n connects, link to each other with electrical network by the second circuit breaker Q F2 again.
As shown in Figure 2, further adopt cooperative control method between the static reacance generator among the present invention and the thuristor throw-in and throw-off reactor.Control protection system 4 further comprises A/D sample circuit 41, two DSP(DigitalSignal Processor; digital signal processor)+double FPGA (Field Programmable Gate Array, i.e. field programmable gate array) is Digital Analog Hybrid Circuits 42, PWM formation circuit 43, photoelectric isolating circuit 44, IGBT driver module 45 and protection and the logic module 46 of core.A/D sample circuit 41 gathers analog signals; calculating through Digital Analog Hybrid Circuits 42; one the tunnel exports protection and logic module 46 to, protects and logic module 46 outputs signal to each switching device in the electronic switch 2 of the power cell 1 of static reacance generator and Reactor Branch again.Protection and logic module 46 further comprise CPLD protective circuit 461, CPLD logical circuit 462 and digital I/O circuit 463.DSP 422 links to each other with CPLD logical circuit 462 with CPLD protective circuit 461 respectively, and CPLD protective circuit 461 links to each other with digital I/O circuit 463 with CPLD logical circuit 462 again; Another road signal forms circuit 43 output PWM ripples through PWM, process photoelectric isolating circuit 44 and IGBT driver module 45 export the power cell 1 of static reacance generator to again, switching device in the multi-level concatenation inverter of driving power unit 1, switching device can adopt IGBT(Insulated GateBipolar Transistor, insulated gate bipolar transistor) etc.Protection and logic module 46 are carried out serial communication with electronic switch 2 and power cell 1 by optical fiber; integrated information; realization is to the protection of electronic switch 2 and power cell 1; protection and logic module 46 are based on CPLD(Complex Programmable LogicDevice; CPLD), the protection project of mainly finishing has: switching device input current overcurrent, direct voltage overvoltage, direct voltage is under-voltage IGBT element fault, long pulse protection, Thyristor fault etc.Wherein, input current overcurrent, direct voltage overvoltage, direct voltage is under-voltage, the protection of IGBT element fault, long pulse is the protection to power cell 1.
Digital Analog Hybrid Circuits 42 further comprises FPGA 421, DSP 422, dual port RAM 423, algorithm DSP module 424 and algorithm FPGA module 425.FPGA 421 will transfer to DSP 422 alternately from the input signal of A/D sample circuit 41.Dual port RAM 423 is responsible for transmitting the interactive information between DSP 422 and the algorithm DSP module 424.DSP 422 is responsible for carrying out malfunction monitoring and logic control is processed, and exports control signals by protection and logic module 46 to electronic switch 2.Algorithm DSP module 424 is responsible for carrying out algorithm process, and forms circuit 43 output PWM ripples by algorithm FPGA module 425 to PWM.
The overwhelming majority between the main transformer station of electric power supply system for subway and traction substation etc. adopts cable to connect, so electric power supply system for subway is except commutation system produces lagging reactive power, and it is idle that cable also can produce the capacitive charging.The main reactive source of electric power supply system for subway comprises: subway rectifier, main transformer and middle pressure transformer, cable charge idle.It is idle to produce perception during rectifier work; It is idle that main transformer and middle pressure transformer can produce perception; It is idle that cable can produce charging, and be capacitive reactive power.In the time of in the early stage transmission power low load running in little and evening of subway, electric power supply system for subway can not surpass the charging capacitive reactive power of cable to the idle compensation capacity of perception, so only consider the idle Q of maximum capacitive under the line system Light Condition during statistic for receiver power quality controlling device capacity
C, controlling device=idle-no-load transformer of cable charging is idle for needs configuration comprehensive electric energy quality.
A/D sample circuit 41 gathers the current i of load 5
LWith through the current i of thuristor throw-in and throw-off reactor compensation back loading 5 '
L, and line voltage U.Digital Analog Hybrid Circuits 42 is according to the current i of load 5
L, line voltage U, and target power factor cos φ calculates the reactive capability that load 5 needs compensation, sends different switching instructions according to the amount of capacity of thuristor throw-in and throw-off reactor and static reacance generator to the electronic switch 2 of the Reactor Branch of thuristor throw-in and throw-off reactor again.
If the compensation capacity of every group of Reactor Branch of thuristor throw-in and throw-off reactor is Q
R, the available compensation capacity of thuristor throw-in and throw-off reactor can be Q like this
RAnd 2Q
R(originally sentencing 2 branch roads is example, namely in the accompanying drawing 1 during n=2), in order to allow controlling device reach the purpose of Continuous Compensation, the capacity of static reacance generator is made as Q
S=Q
R/ 2, by its available compensation capacity be-Q
R/ 2 ~ Q
R/ 2, so the compensation capacity that whole device can provide is-5Q
R/ 2 ~ Q
R/ 2.When the thuristor throw-in and throw-off reactor comprised two groups of Reactor Branchs, control protection system 4 was determined the compensating instruction of thuristor throw-in and throw-off reactor according to following rule
Determine the group number of Reactor Branch switching, and send trigger impulse to the thyristor groups of electronic switch 2:
As Q≤Q
R/ 2 o'clock,
Each branch road of thuristor throw-in and throw-off reactor is not all thrown 0～Q
R/ 2 are compensated by static reacance generator;
When-Q
R/ 2＜Q≤0 o'clock,
Each branch road of thuristor throw-in and throw-off reactor is not all thrown-Q
R/ 2～0 is compensated by static reacance generator;
When-Q
R＜Q≤-Q
R/ 2 o'clock,
The thuristor throw-in and throw-off reactor drops into one group of branch road, 0～Q
R/ 2 are compensated by static reacance generator;
When-3Q
R/ 2＜Q≤-Q
RThe time,
The thuristor throw-in and throw-off reactor drops into one group of branch road ,-Q
R/ 2～0 is compensated by static reacance generator;
When-2Q
R＜Q≤-3Q
R/ 2 o'clock,
The thuristor throw-in and throw-off reactor drops into two groups of branch roads, 0～Q
R/ 2 are compensated by static reacance generator;
When-5Q
R/ 2＜Q≤-2Q
RThe time,
The thuristor throw-in and throw-off reactor drops into two groups of branch roads ,-Q
R/ 2～0 is compensated by static reacance generator.
Numeral I/O circuit 463 is according to compensating instruction
Thyristor groups switching controller in the thuristor throw-in and throw-off reactor sends corresponding switching instruction, the thyristor groups switching controller is received after the instruction Automatic-searching the best time and is sent trigger impulse by optical cable to the thyristor groups in the Reactor Branch, finishes the switching operation of compensation branch road.
The output current of the power cell 1 of static reacance generator enters Digital Analog Hybrid Circuits 42 by A/D sample circuit 41; after process algorithm DSP module 424 calculates the modulation ratio M and phase place α of sinusoidal modulation signal; further obtain the three-phase PWM modulation signal; three-phase PWM modulation signal data are sent to algorithm FPGA module 425; and periodic refreshing three-phase PWM modulation signal data, then relatively produce pwm signal with the phase shift triangular carrier and export PWM formation circuit 43 to.Then the algorithm FPGA module 425 storage algorithm DSP modules 424 up-to-date information datas that refresh relatively produce pwm signal with the phase shift triangular carrier, no longer need to take operation time and the resource of DSP.Wherein based on the multi-channel PWM generator of algorithm FPGA module 425 mainly by sine-wave generator, triangular-wave generator, carrier phase SPWM generator, and the dead band generator form.
The maximum characteristics that the present invention adopts DSP and FPGA to unite use are: flexible structure, stronger versatility is arranged, and hardware need not be revised and different algorithms can be realized, be suitable for modularized design, improve efficiency of algorithm; Its construction cycle of while is shorter, and system is easy to maintenance and expansion, is applicable to real time signal processing.
As shown in Figure 3, algorithm DSP module 424 comprises idle detection module 11, abc/dq0 conversion module 12, dc voltage regulation module 13 and modulation ratio and phase angle calculating module 14.The reactive current i that the output current signal of the power cell 1 of static reacance generator obtains through abc/dq0 conversion module 12
qWith the idle reference current that obtains by idle detection module 11
Carry out PI(Proportional Integral, proportional integral) regulate active current i
dWith the meritorious reference current that obtains by direct current voltage regulator 13
Carrying out PI regulates.Utilization is to the voltage U of power supply 6
SCarry out the voltage signal V that obtains after the abc/dq0 conversion
SdBe connected reactance ω L to i
q,
Id,
Carry out the PI decoupling zero, obtain the dq coordinate components that static reacance generator need to send
The dq coordinate components that module 14 is sent according to the static reacance generator needs is calculated at modulation ratio and phase angle
Gather cascade module, i.e. the dc voltage value V of power cell 1 cascade type inverter
Dc, line voltage phase angle θ and power cell 1 in the unit number N of every mutually cascaded inverter calculate modulation ratio M and the phase angle [alpha] of sinusoidal modulation signal.Computing formula is as follows:
Above algorithm all carries out in algorithm DSP module 424, and algorithm DSP module 424 is after finishing control calculating, and periodic refreshing exports the modulation signal data of power cell 1 to, and delivers to algorithm FPGA module 425.The pwm signal of algorithm FPGA module 425 outputs is finished the pwm pulse level conversion through amplification, isolation, driving, and signal through amplifying, is isolated, and forms each power switch pipe that the driving signal with real driving force removes power cell 1.
A kind of embodiment of electric power supply system for subway comprehensive electric energy quality improvement method may further comprise the steps:
The A/D sample circuit 41 of control protection system 4 gathers load current and mains voltage signal, through the calculating of Digital Analog Hybrid Circuits 42, thuristor throw-in and throw-off reactor switching control signal is exported to each switching device in the electronic switch 2 of the power cell 1 of static reacance generator and Reactor Branch by protection and logic module 46; The A/D sample circuit 41 of control protection system 4 gathers the output current signal of the power cell 1 of static reacance generator; calculating through Digital Analog Hybrid Circuits 42; form circuit 43 output PWM ripples by PWM, export control signal in the static reacance generator power cell 1 switching device through photoelectric isolating circuit 44 and IGBT driver module 45 again.
A/D sample circuit 41 gathers the current i of load 5
LWith through the current i of thuristor throw-in and throw-off reactor compensation back loading 5 '
L, and line voltage U; Digital Analog Hybrid Circuits 42 is according to the current i of load 5
L, line voltage U, and target power factor cos φ calculates the reactive capability Q that load 5 needs compensation, then sends different switching instructions according to the amount of capacity of thuristor throw-in and throw-off reactor and static reacance generator to the electronic switch 2 of the Reactor Branch of thuristor throw-in and throw-off reactor.
The output current signal of the power cell 1 of the static reacance generator reactive current i that conversion obtains through abc/dq0
qWith the idle reference current that obtains by idle detection
Carry out PI and regulate active current i
dWith the meritorious reference current that obtains by dc voltage regulation
Carrying out PI regulates; Utilization is to the voltage U of power supply 6
SCarry out the voltage signal V that obtains after the abc/dq0 conversion
SdBe connected reactance ω L to i
q,
Id,
Carry out the PI decoupling zero, obtain the dq coordinate components that static reacance generator need to send
And according to the dc voltage value V of the power cell 1 cascade type inverter that gathers
Dc, line voltage phase angle θ and power cell 1 in the unit number N of every mutually cascaded inverter calculate modulation ratio M and the phase angle [alpha] of sinusoidal modulation signal; Wherein, θ is the phase angle of line voltage, namely abc/dq0 conversion module 12 with the phase angle θ of line voltage as the phase-locked value of the line voltage that carries out the abc/dq0 conversion.
The present invention has changed original static reacance generator and the separately mode of use only appears in the thuristor throw-in and throw-off reactor.By the Collaborative Control of control system, by the most first-harmonic capacitive reactive power of thuristor throw-in and throw-off reactor compensating load, static reacance generator is the idle and harmonic wave of compensate for residual then.So both having overcome the thuristor throw-in and throw-off reactor can only have level to regulate the defective of reactive power compensation, has solved again the high problem of large volume static reactive generator cost.Bring into play simultaneously the characteristics of the large and static reacance generator Continuous Compensation of thuristor throw-in and throw-off reactor compensation capacity, realized the target to the big capacity load Continuous Compensation.
The power that active part needs among the present invention is little, therefore can not increase a lot of costs, but can greatly improve compensation effect, has improved the performance of whole electric power supply system for subway.Simultaneously, have good dynamically continuous regulating power, it is adjustable continuously to capacitive reactive power that perception is idle, possesses simultaneously good harmonic characterisitic and filter function, and loss and floor space are little, realize fast reactive power compensation and harmonic wave control.Adopt the static reacance generator of cascade connection multi-level type.With respect to multiplex and clamped multi-level structure, be easy to modularization and expansion on the cascade connection multi-level type static reacance generator structure, have the voltage redundancy properties, be convenient to realize soft switch technique, control method is simple, is more perfect inverter.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Although the present invention discloses as above with preferred embodiment, yet is not to limit the present invention.Any those of ordinary skill in the art, do not breaking away from the technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, be equal to replacements, equivalence changes and modify, all still belong in the scope that technical solution of the present invention protects.
Claims (13)
1. an electric power supply system for subway comprehensive electric energy quality controlling device is characterized in that, comprising: static reacance generator, thuristor throw-in and throw-off reactor, precharge loop (3), control protection system (4) and alternating-current switch; Described static reacance generator comprises power cell (1) and reactor (L10), static reacance generator links to each other with precharge loop (3), power cell (1) is connected with reactor (L10), and precharge loop (3) are again by alternating-current switch and the mains side that is connected to electrical network; Described thuristor throw-in and throw-off reactor comprises two groups of above Reactor Branchs, described Reactor Branch comprises reactor (L11～L1n) and electronic switch (2), reactor (L11～L1n) connect with electronic switch (2), Reactor Branch is connected in parallel on the load-side of electrical network by electronic switch (2); Described control protection system (4) links to each other with static reacance generator, thuristor throw-in and throw-off reactor respectively, controls the input of Reactor Branch in the thuristor throw-in and throw-off reactor with compensating reactive power, and control static reacance generator compensating reactive power.
2. a kind of electric power supply system for subway comprehensive electric energy quality controlling device according to claim 1, it is characterized in that: reactor links to each other with the power cell of static reacance generator and the Reactor Branch of thuristor throw-in and throw-off reactor respectively; Described precharge loop (3) comprises charging resistor (R) and the 3rd circuit breaker (QF11), and described the 3rd circuit breaker (QF11) is connected in parallel on the two ends of charging resistor (R); Described alternating-current switch comprises the first circuit breaker (QF1), the second circuit breaker (QF2), the first isolating switch (QS1) and isolating switch (QS11～QS1n); Precharge loop (3) links to each other with electrical network by the first circuit breaker (QF1), the first isolating switch (QS1) successively; The isolating switch of the Reactor Branch of thuristor throw-in and throw-off reactor by separately (after QS11～QS1n) connects, links to each other with electrical network by the second circuit breaker (QF2) again.
3. a kind of electric power supply system for subway comprehensive electric energy quality controlling device according to claim 1 and 2 is characterized in that: described control protection system (4) comprises that A/D sample circuit (41), Digital Analog Hybrid Circuits (42), PWM form circuit (43), photoelectric isolating circuit (44), IGBT driver module (45) and protection and logic module (46); A/D sample circuit (41) gathers analog signals, calculating through Digital Analog Hybrid Circuits (42), one the tunnel exports protection and logic module (46) to, protects and logic module (46) outputs signal to each switching device in the electronic switch (2) of the power cell (1) of static reacance generator and Reactor Branch again; Another road signal forms circuit (43) output PWM ripple through PWM, passes through the power cell (1) that photoelectric isolating circuit (44) and IGBT driver module (45) export static reacance generator to again.
4. a kind of electric power supply system for subway comprehensive electric energy quality controlling device according to claim 3, it is characterized in that: described Digital Analog Hybrid Circuits (42) comprises FPGA(421), DSP(422), dual port RAM (423), algorithm DSP module (424) and algorithm FPGA module (425); FPGA(421) will transfer to alternately DSP(422 from the input signal of A/D sample circuit (41)); Dual port RAM (423) be responsible for to transmit DSP(422) and algorithm DSP module (424) between interactive information; DSP(422) be responsible for carrying out malfunction monitoring and logic control and process, and export control signal by protection and logic module (46) to electronic switch (2); Algorithm DSP module (424) is responsible for carrying out algorithm process, and forms circuit (43) output PWM ripple by algorithm FPGA module (425) to PWM.
5. a kind of electric power supply system for subway comprehensive electric energy quality controlling device according to claim 4 is characterized in that: the current i of described A/D sample circuit (41) collection load (5)
LWith through the current i of thuristor throw-in and throw-off reactor compensation back loading (5) '
L, and line voltage U; Digital Analog Hybrid Circuits (42) is according to the current i of load (5)
L, line voltage U, and target power factor cos φ calculates the reactive capability that load (5) needs compensation, sends different switching instructions according to the amount of capacity of thuristor throw-in and throw-off reactor and static reacance generator to the electronic switch (2) of the Reactor Branch of thuristor throw-in and throw-off reactor again.
6. according to claim 4 or 5 described a kind of electric power supply system for subway comprehensive electric energy quality controlling devices; it is characterized in that: when the thuristor throw-in and throw-off reactor comprised two groups of Reactor Branchs, control protection system (4) was determined the compensating instruction of thuristor throw-in and throw-off reactor according to following rule
Determine the group number of Reactor Branch switching, and send trigger impulse to the thyristor groups of electronic switch (2):
As Q≤Q
R/ 2 o'clock,
Each branch road of thuristor throw-in and throw-off reactor is not all thrown 0～Q
R/ 2 are compensated by static reacance generator;
When-Q
R/ 2＜Q≤0 o'clock,
Each branch road of thuristor throw-in and throw-off reactor is not all thrown-Q
R/ 2～0 is compensated by static reacance generator;
When-Q
R＜Q≤-Q
R/ 2 o'clock,
The thuristor throw-in and throw-off reactor drops into one group of branch road, 0～Q
R/ 2 are compensated by static reacance generator;
When-3Q
R/ 2＜Q≤-Q
RThe time,
The thuristor throw-in and throw-off reactor drops into one group of branch road ,-Q
R/ 2～0 is compensated by static reacance generator;
When-2Q
R＜Q≤-3Q
R/ 2 o'clock,
The thuristor throw-in and throw-off reactor drops into two groups of branch roads, 0～Q
R/ 2 are compensated by static reacance generator;
When-5Q
R/ 2＜Q≤-2Q
RThe time,
The thuristor throw-in and throw-off reactor drops into two groups of branch roads ,-Q
R/ 2～0 is compensated by static reacance generator;
Wherein, Q
RCompensation capacity for every group of branch road of thuristor throw-in and throw-off reactor.
7. according to claim 4 or 5 described a kind of electric power supply system for subway comprehensive electric energy quality controlling devices; it is characterized in that: the output current of the power cell of described static reacance generator (1) enters Digital Analog Hybrid Circuits (42) by A/D sample circuit (41); after process algorithm DSP module (424) calculates the modulation ratio M and phase place α of sinusoidal modulation signal; further obtain the three-phase PWM modulation signal; three-phase PWM modulation signal data are sent to algorithm FPGA module (425); and periodic refreshing three-phase PWM modulation signal data, then relatively produce pwm signal with the phase shift triangular carrier and export PWM formation circuit (43) to.
8. it is characterized in that according to claim 4 or 5 described a kind of electric power supply system for subway comprehensive electric energy quality controlling devices: described algorithm DSP module (424) comprises that idle detection module (11), abc/dq0 conversion module (12), dc voltage regulation module (13) and modulation ratio and phase angle calculate module (14); The reactive current i that the output current signal of the power cell of static reacance generator (1) obtains through abc/dq0 conversion module (12)
qWith the idle reference current that obtains by idle detection module (11)
Carry out PI and regulate active current i
dWith the meritorious reference current that obtains by direct current voltage regulator (13)
Carrying out PI regulates; Utilization is to the voltage U of power supply (6)
SCarry out the voltage signal V that obtains after the abc/dq0 conversion
SdBe connected reactance ω L to i
q,
Id,
Carry out the PI decoupling zero, obtain the dq coordinate components that static reacance generator need to send
The dq coordinate components that module (14) is sent according to the static reacance generator needs is calculated at modulation ratio and phase angle
The dc voltage value V of power cell (1) the cascade type inverter that gathers
Dc, line voltage phase angle θ and power cell (1) in the unit number N of every mutually cascaded inverter calculate modulation ratio M and the phase angle [alpha] of sinusoidal modulation signal.
9. according to claim 1, the described a kind of electric power supply system for subway comprehensive electric energy quality controlling device of arbitrary claim in 2,4,5, it is characterized in that: described static reacance generator adopts cascade connection multi-level type static reacance generator, and described power cell (1) adopts heterogeneous cascaded inverter.
10. an electric power supply system for subway comprehensive electric energy quality improvement method is characterized in that, may further comprise the steps:
Described control protection system (4) gathers electric current and the line voltage of load (5); At first according to electric current and the line voltage of load (5), calculating load (5) needs the reactive capability of compensation, then by sending different switching instructions to electronic switch (2), two groups of above Reactor Branchs of control thuristor throw-in and throw-off reactor carry out switching, and the large capacity of compensation network is idle;
Described control protection system (4) gathers the output current of the power cell (1) of static reacance generator; obtain the three-phase PWM modulation signal through computing; obtain more afterwards driving the pwm signal of static reacance generator power cell (1) with the phase shift triangular carrier, control static reacance generator power cell (1) compensation thuristor throw-in and throw-off reactor is uncompensated idle.
11. a kind of electric power supply system for subway comprehensive electric energy quality improvement method according to claim 10, it is characterized in that: the A/D sample circuit (41) of described control protection system (4) gathers load current and mains voltage signal, through the calculating of Digital Analog Hybrid Circuits (42), thuristor throw-in and throw-off reactor switching control signal is exported to each switching device in the electronic switch (2) of the power cell (1) of static reacance generator and Reactor Branch by protection and logic module (46); The A/D sample circuit (41) of described control protection system (4) gathers the output current signal of the power cell (1) of static reacance generator; calculating through Digital Analog Hybrid Circuits (42); form circuit (43) output PWM ripple by PWM, pass through again photoelectric isolating circuit (44) and IGBT driver module (45) and export control signal in the static reacance generator power cell (1) switching device.
12. a kind of electric power supply system for subway comprehensive electric energy quality improvement method according to claim 11 is characterized in that: described A/D sample circuit (41) gathers the current i of load (5)
LWith through the current i of thuristor throw-in and throw-off reactor compensation back loading (5) '
L, and line voltage U; Digital Analog Hybrid Circuits (42) is according to the current i of load (5)
L, line voltage U, and target power factor cos φ calculates the reactive capability Q that load (5) needs compensation, then sends different switching instructions according to the amount of capacity of thuristor throw-in and throw-off reactor and static reacance generator to the electronic switch (2) of the Reactor Branch of thuristor throw-in and throw-off reactor.
13. the described a kind of electric power supply system for subway comprehensive electric energy quality improvement method of arbitrary claim in 12 is characterized in that: the output current signal of the power cell of static reacance generator (1) the reactive current i that conversion obtains through abc/dq0 according to claim 10
qWith the idle reference current that obtains by idle detection
Carry out PI and regulate active current i
dWith the meritorious reference current that obtains by dc voltage regulation
Carrying out PI regulates; Utilization is to the voltage U of power supply (6)
SCarry out the voltage signal V that obtains after the abc/dq0 conversion
SdBe connected reactance ω L to i
q,
Id,
Carry out the PI decoupling zero, obtain the dq coordinate components that static reacance generator need to send
And according to the dc voltage value V of power cell (1) the cascade type inverter that gathers
Dc, line voltage phase angle θ and power cell (1) in the unit number N of every mutually cascaded inverter calculate modulation ratio M and the phase angle [alpha] of sinusoidal modulation signal.
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| CN111224407A (en) * | 2020-03-27 | 2020-06-02 | 国网河南省电力公司信息通信公司 | Power network protection system |
| CN111224407B (en) * | 2020-03-27 | 2021-06-18 | 国网河南省电力公司信息通信公司 | Power network protection system |
| CN111509734A (en) * | 2020-05-29 | 2020-08-07 | 国网山东省电力公司电力科学研究院 | Reactive power control-based reactive compensation circuit of magnetically controlled reactor and control method thereof |
| CN111509734B (en) * | 2020-05-29 | 2021-10-15 | 国网山东省电力公司电力科学研究院 | Reactive power control-based reactive compensation circuit of magnetically controlled reactor and control method thereof |
| CN115764920A (en) * | 2023-01-09 | 2023-03-07 | 杭州得诚电力科技股份有限公司 | Static var generator, control method and control module of static var generator |
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