CN106786589B - A kind of tri- level of 690V, three bridge arm shunt active power filter - Google Patents
A kind of tri- level of 690V, three bridge arm shunt active power filter Download PDFInfo
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- CN106786589B CN106786589B CN201710131336.5A CN201710131336A CN106786589B CN 106786589 B CN106786589 B CN 106786589B CN 201710131336 A CN201710131336 A CN 201710131336A CN 106786589 B CN106786589 B CN 106786589B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- Y02E40/20—Active power filtering [APF]
Abstract
The present invention discloses a kind of tri- level of 690V, three bridge arm shunt active power filter, including load current sensor, grid voltage sensor, the side APF current sensor, diode clamp bit-type three-level topology circuit, busbar direct current voltage sensor, dsp controller, repetition PI controller and logic CPLD device；The electric signal that the load current sensor, grid voltage sensor, the side APF current sensor and busbar direct current voltage sensor will test respectively is sent to dsp controller, the repeated PI controller of signal and logic CPLD device of the dsp controller output form 12 road IGBT driving signals, and 12 road IGBT driving signals of output are sent to diode clamp bit-type three-level topology circuit for controlling IGBT module.The problem of present invention carries out harmonic wave and reactive compensation using 690V avoids active filter resonance problems caused by harmonic wave, reduces loss and reduces influence of the harmonic wave to communication signal.
Description
Technical field
The invention belongs to active filter technical fields, are related to a kind of tri- level of 690V, three bridge arm shunt active power filter
Device.
Background technique
690V low-pressure system is as one of the standard voltage system introduced in IEC60038, and there is wide in European industry
General application.With flourishing for domestic industry, 690V system is in Chinese large-sized papermaking, petrochemical industry, metallurgy, during mine etc. contains
In the project of frequency furnace, a large amount of motors and large-size machine load, relatively broad application is also started.It is a large amount of with 690V motor
It uses, the frequency converter of 690V is also common in market.In the low-pressure system that frequency is 50Hz, 230/400V, 400/690V voltage
It is international standard voltage system.Existing 380V voltage is upgraded to 660V voltage, transmission distance can be increased, is improved defeated
Electric energy power；Number transformer can be reduced, factory's distribution system is simplified, improves power supply reliability；The cross-section of cable can be reduced, saving has
Non-ferrous metal；Cpable of lowering power loss and short-circuit current value；And the capacity etc. for expanding asynchronous motor, thus be effectively to economize on electricity
One of means, mesolow 690V system application in, common transformer capacity can carry more multi-load up to 3150kVA, from
And reduce and use number transformer, improve power supply reliability.For the advantage of 690V system, a large amount of load begins to use 690V
Voltage class loads the nonlinear loads such as more common frequency converter, intermediate frequency furnace, will lead to harmonic content THD and get higher, electricity
Stream, voltage distortion are than more serious；Therefore, a kind of tri- level of 690V, three bridge arm shunt active power filter need to be designed to solve 690V
Research on Voltage Class.
Summary of the invention
The purpose of the present invention is to provide a kind of tri- level of 690V, three bridge arm shunt active power filters, pass through
The purpose of the present invention can be achieved through the following technical solutions:
A kind of tri- level of 690V, three bridge arm shunt active power filter, including load current sensor, network voltage sensing
Device, the side APF current sensor, diode clamp bit-type three-level topology circuit, busbar direct current voltage sensor, dsp controller, again
Multiple PI controller and logic CPLD device；
The load current sensor, grid voltage sensor, the side APF current sensor and busbar direct current voltage sensor
The electric signal that will test respectively is sent to the dsp controller, and the dsp controller handles received signal, DSP control
The repeated PI controller of signal and logic CPLD device of device output processed form 12 road IGBT driving signals, 12 road IGBT of output
Driving signal is sent to diode clamp bit-type three-level topology circuit for controlling IGBT module.
It further, further include nonlinear load, 690V three phase mains, main circuit breaker, soft starting circuit, LCL filter
With diode clamp bit-type three-level topology circuit；
The nonlinear load is connect by load current sensor with main circuit breaker, and the 690V three phase mains passes through electricity
Net voltage sensor is connect with main circuit breaker, and the main circuit breaker is connect by the side APF current sensor with soft starting circuit, institute
It states soft starting circuit to connect with LCL filter, the LCL filter and diode clamp bit-type three-level topology circuit connection.
Further, the soft starting circuit includes main contactor, soft start resistance and soft start contactor, described soft to open
Dynamic device resistance is in parallel with main contactor after connecting with soft start contactor.
Further, the LCL filter includes filter capacitor, inverter bridge reactor and network reactor, described inverse
Become bridge reactor to connect with network reactor, the midpoint parallel filtering of the inverter bridge reactor and network reactor
Capacitor.
Further, there are three bridge arms, same time trigger to need 12 for the diode clamp bit-type three-level topology circuit
Trigger pulse, wherein the output of any one bridge arm is respectively high level, zero level and low level there are three types of state.
Further, the dsp controller generates 6 tunnel independence PWM output signals, and the decoding of dsp controller 22 generates
Road IGBT trigger pulse pwm signal.
Beneficial effects of the present invention: the present invention reduces IGBT by using diode clamp bit-type three-level topology circuit
The grade and loss of switch tube voltage；By using LCL filter circuit, reduces filter inductance and improve filter effect；Using
690V carries out the problem of harmonic wave and reactive compensation, avoids active filter resonance problems caused by harmonic wave, by solving harmonic wave
Problem reduces loss and reduces influence of the harmonic wave to communication signal.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will be described below to embodiment required
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is a kind of tri- level of 690V, three bridge arm shunt active power filter schematic diagram of the present invention；
Fig. 2 is DSP of the present invention and CPLD controller schematic diagram；
Fig. 3 is Harmonic currents detection block diagram of the present invention；
Fig. 4 is that the present invention repeats PI control schematic diagram；
In attached drawing, parts list represented by the reference numerals are as follows:
1- nonlinear load, 2- load current sensor, 3- grid voltage sensor, 4-690V three phase mains, 5- master are disconnected
Road device, the side 6-APF current sensor, 7- soft start structure, 8- main contactor device, 9- soft start resistance, the contact of 10- soft start
Device, 11-LCL filter, 12- filter capacitor, 13- inverter bridge reactor, 14- network reactor, 15- diode clamp bit-type three
Level inverse conversion structure, 16-IGBT half-bridge module, 17- clamp diode, 18- busbar capacitor, 19- busbar direct current voltage sensor,
20- discharge resistance, 21- electric discharge contactor, 22-DSP controller, 23- repeat PI controller, 24- logic CPLD device.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
Refering to Figure 1, the present invention is a kind of tri- level of 690V, three bridge arm shunt active power filter, including non-linear
Load 1, load current sensor 2, grid voltage sensor 3,690V three phase mains 4, main circuit breaker 5, the side APF current sensor
6, soft starting circuit 7, LCL filter 11 and diode clamp bit-type three-level topology circuit 15；
Nonlinear load 1 is connect by load current sensor 2 with main circuit breaker 5, and 690V three phase mains 4 passes through power grid electricity
Pressure sensor 3 is connect with main circuit breaker 5, and main circuit breaker 5 is connect by the side APF current sensor 6 with soft starting circuit 7, soft to open
Dynamic circuit 7 is connect with LCL filter 11, and LCL filter 11 is connect with diode clamp bit-type three-level topology circuit 15.
Wherein soft starting circuit 7 includes main contactor 8, soft start resistance 9 and soft start contactor 10, soft activator resistance
9 connect with soft start contactor 10 after it is in parallel with main contactor 8.
Wherein LCL filter 11 includes filter capacitor 12, inverter bridge reactor 13 and network reactor 14, inverter bridge side
Reactor 13 is connected with network reactor 14, the midpoint parallel filtering electricity of inverter bridge reactor 13 and network reactor 14
Hold 12.
Wherein diode clamp bit-type three-level topology circuit 15 includes IGBT half-bridge module 16, clamp diode 17, busbar
Capacitor 18, busbar direct current voltage sensor 19, discharge resistance 20 and electric discharge contactor 21, are total to there are six IGBT half-bridge module 16,
Constitute three groups, every group in series by two IGBT half-bridge modules 16, two IGBT half-bridge modules 16 after series connection respectively with its
His two groups of progress are in parallel, and two clamp diodes 17 are connect with the midpoint of concatenated two IGBT half-bridge module 16 respectively after connecting；
Four busbar capacitors 18 constitute two groups of concatenated busbar capacitors 18 two-by-two, two mothers after busbar capacitor 18 and series connection after series connection
Arrange direct current voltage sensor 19 and discharge resistance 20 and electric discharge contactor 21 connect respectively with every group of IGBT half-bridge module 16 into
Row is in parallel；Two clamp diodes 17 respectively with the midpoint of concatenated two busbars capacitor 18 and concatenated two busbars DC voltage
The midpoint of sensor 19 connects.
Load current sensor 2, grid voltage sensor 3, the side APF current sensor 6 and busbar direct current voltage sensor
19 electric signals that will test respectively are sent to dsp controller 22, and dsp controller 22 handles received signal, DSP control
The repeated PI controller 23 of signal and logic CPLD device 24 that device 22 exports form 12 road IGBT driving signals, 12 tunnels of output
IGBT driving signal is sent to diode clamp bit-type three-level topology circuit 15, and 12 road IGBT driving signals of output are used for two
IGBT module in pole pipe clamper type three-level topology circuit 15 is controlled.
As shown in Fig. 2, dedicated as the suppression for power harmonie of controller using dsp controller 22 and logic CPLD device 24
Equipment is made of two major parts of instruction current computing circuit and compensating current generating circuit, and instruction current computing circuit is real
When monitor nonlinear load line road electric current ixL, and be digital signal by analog current sample conversion, it is sent into dsp controller
22, dsp controller 22 handles signal, extracts harmonic component as compensation current reference value；Dsp controller 22 passes through control
Algorithm keeps track processed compensates current reference value and logic CPLD device 24 is combined to export 12 road IGBT switching tube trigger signals, passes through drive
Dynamic circuit sends out driving pulse to IGBT, drives IGBT module, generates benefit equal with mains by harmonics current amplitude, opposite polarity
Electric current injection power grid is repaid, harmonic current is compensated or is offset, electric harmonic is actively eliminated.
A kind of 690V active filter control method, by acquiring threephase load electric current ixL(x=a, b, c, similarly hereinafter),
Using instantaneous reactive power theory, harmonic current reference value i is detected by ip-iq algorithmxh *, it is as shown in Figure 3 to detect block diagram:
Wherein,
PI control method is wherein repeated, control block diagram is as shown in Figure 4:
I in figurerefFor input signal, Ic is output signal, and e is error signal, Z-NFor cycle delay link, N is one
The sampling number of primitive period, C (z) are the compensator for repeating control loop, and E is voltage feed-forward control signal, GPI(z) it is controlled for PI
Link processed, GAPFIt (z) is control object, dotted box portion is repeating signal generator internal model in figure, and which provided filter Q
(z), to generate good inhibiting effect to PERIODIC INTERFERENCE.Q (z) can be the constant less than 1, or with low-pass nature
Function.To weaken storage effect, Q (z)=0.95 is usually used, i.e., the output quantity in a upper period is through 0.95 times of overdamping and currently
Error add up by the primitive period, then the transmission function of repetitive controller are as follows:
Compensator C (z) is by Repetitive controller gain K under normal circumstancesr, differentiation element ZkWith filter C1(z) three parts group
At:
C (z)=Kr·zk·C1(z)
KrFor controlling the Proper Match of stability margin and error convergence speed, value range is 0 to 1；Phase compensation ring
Save ZkIt is mainly used to compensate P (z) and C (z) delayed phase caused by low-frequency range；C1It (z) is low-pass filter, mainly to P (z)
Carry out amplitude compensation.
Since 690V active filter uses diode clamp bit-type three-level topology circuit 15, a bridge arm needs 4 touchings
Pulse is sent out, then the circuit synchronization needs 12 trigger pulses altogether；By taking any bridge arm as an example, there are three types of the outputs of each bridge arm
State: high level (output voltage is+1/2Udc), zero level (output voltage 0), low level (output voltage is -1/2Udc),
Then every phase needs two-way low and high level signal at least to indicate three kinds of states, and respectively corresponding is 10,00,01, therefore dsp controller
22 need to generate 6 tunnel independence PWM output signals altogether, then decode through dsp controller 22 and generate 12 road IGBT trigger pulse pwm signals.
The present invention is using Freescale company MC56F84789 chip and altera corp's EPM1270 chip as control panel
Main chip, the enhanced PWM module of the dsp chip can export the independent pwm signal in 6 tunnels, meet circuit and believe control
Number requirement.
The present invention by using diode clamp bit-type three-level topology circuit, reduce IGBT switch tube voltage grade and
Loss；By using LCL filter circuit, reduces filter inductance and improve filter effect；Harmonic wave and nothing are carried out using 690V
The problem of function compensates, avoids active filter resonance problems caused by harmonic wave, by solving harmonic problem, reduces loss and drop
Influence of the low harmony wave to communication signal.
The above content is just an example and description of the concept of the present invention, affiliated those skilled in the art
It makes various modifications or additions to the described embodiments or is substituted in a similar manner, without departing from invention
Design or beyond the scope defined by this claim, be within the scope of protection of the invention.
Claims (1)
1. a kind of tri- level of 690V, three bridge arm shunt active power filter, it is characterised in that: including load current sensor (2),
Grid voltage sensor (3), the side APF current sensor (6), diode clamp bit-type three-level topology circuit (15), busbar direct current
Voltage sensor (19), repeats PI controller (23) and logic CPLD device (24) at dsp controller (22)；
The load current sensor (2), grid voltage sensor (3), the side APF current sensor (6) and busbar DC voltage
The electric signal that sensor (19) will test respectively is sent to the dsp controller (22), and the dsp controller (22) is to received
Signal is handled, the repeated PI controller (23) of signal of dsp controller (22) output and logic CPLD device (24) formation
12 road IGBT driving signals, 12 road IGBT driving signals of output are sent to diode clamp bit-type three-level topology circuit (15) use
It is controlled in IGBT module；
It further include nonlinear load (1), 690V three phase mains (4), main circuit breaker (5), soft starting circuit (7), LCL filter
(11) and diode clamp bit-type three-level topology circuit (15)；
The nonlinear load (1) is connect by load current sensor (2) with main circuit breaker (5), the 690V three phase mains
(4) it is connect by grid voltage sensor (3) with main circuit breaker (5), the main circuit breaker (5) passes through the side APF current sensor
(6) it is connect with soft starting circuit (7), the soft starting circuit (7) connect with LCL filter (11), the LCL filter (11)
It is connect with diode clamp bit-type three-level topology circuit (15)；
The soft starting circuit (7) includes main contactor (8), soft start resistance (9) and soft start contactor (10), described soft to open
Dynamic device resistance (9) are in parallel with main contactor (8) after connecting with soft start contactor (10)；
The LCL filter (11) includes filter capacitor (12), inverter bridge reactor (13) and network reactor (14), described
Inverter bridge reactor (13) is connected with network reactor (14), the inverter bridge reactor (13) and network reactor
(14) midpoint parallel filtering capacitor (12)；
There are three bridge arm, same time triggers to need 12 trigger pulses for the diode clamp bit-type three-level topology circuit (15),
Wherein the output of any one bridge arm is respectively high level, zero level and low level there are three types of state；
The dsp controller (22) generates 6 tunnel independence PWM output signals, and dsp controller (22) decoding generates 12 road IGBT
Trigger pulse pwm signal；
Suppression for power harmonie special equipment using dsp controller (22) and logic CPLD device (24) as controller, by referring to
Current operator circuit and compensating current generating circuit is enabled to form, instruction current computing circuit monitors nonlinear load line road in real time
Electric current ixL, and be digital signal by analog current sample conversion, it is sent into dsp controller (22), dsp controller (22) is to signal
It is handled, extracts harmonic component as compensation current reference value；Dsp controller (22) passes through control algolithm tracking and compensating current
Reference value simultaneously combines logic CPLD device (24) to export 12 road IGBT switching tube trigger signals, is sent out by driving circuit to IGBT
Driving pulse drives IGBT module, generates compensation electric current equal with mains by harmonics current amplitude, opposite polarity and injects power grid,
Harmonic current is compensated or is offset, electric harmonic is actively eliminated；
Steps are as follows for the calculating of harmonic current reference value:
Step 1: by acquiring threephase load electric current ixL, x=a, b, c；
Step 2: instantaneous reactive power theory is utilized, harmonic current reference value i is detected by ip-iq algorithmxh *,
The transmission function of repetitive controller are as follows:
Compensator C (z) is by Repetitive controller gain Kr, differentiation element ZkWith filter C1(z) three parts form:
C (z)=Kr·zk·C1(z)
KrFor controlling the Proper Match of stability margin and error convergence speed, value range is 0 to 1；Phase compensation link ZkIt is main
To be used to compensate P (z) and C (z) delayed phase caused by low-frequency range；C1(z) it is low-pass filter, width mainly is carried out to P (z)
Value complement is repaid.
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| CN110048432A (en) * | 2019-04-03 | 2019-07-23 | 杭州电子科技大学 | Multifunctional electric energy quality control apparatus and control method based on three-level current transformer |
| CN110011555B (en) * | 2019-05-10 | 2021-04-20 | 安徽大学 | Charging control method for direct-current side capacitor of diode-clamped three-level converter |
| CN112994003A (en) * | 2020-09-18 | 2021-06-18 | 青岛鼎信通讯股份有限公司 | Communication method between diode-clamped three-level APFs |
| CN112467756A (en) * | 2020-10-30 | 2021-03-09 | 国网山东省电力公司临沂供电公司 | Reactive power compensation device and method |
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| CN103901301A (en) * | 2014-03-21 | 2014-07-02 | 北京天诚同创电气有限公司 | Fault diagnosis method for frequency converter |
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| CN103901301A (en) * | 2014-03-21 | 2014-07-02 | 北京天诚同创电气有限公司 | Fault diagnosis method for frequency converter |
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