CN202455073U - Multilevel active power filter distributed control device - Google Patents
Multilevel active power filter distributed control device Download PDFInfo
- Publication number
- CN202455073U CN202455073U CN2011204919394U CN201120491939U CN202455073U CN 202455073 U CN202455073 U CN 202455073U CN 2011204919394 U CN2011204919394 U CN 2011204919394U CN 201120491939 U CN201120491939 U CN 201120491939U CN 202455073 U CN202455073 U CN 202455073U
- Authority
- CN
- China
- Prior art keywords
- controller
- chain link
- central controller
- control
- strand joint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Images
Classifications
-
- 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]
Landscapes
- Inverter Devices (AREA)
Abstract
The utility model provides a multilevel active power filter distributed control device which integrates the upper control of a central controller with the lower control of each chain link. Each chain link is an integrated power unit which is provided with an independent controller, so the modularization and the chain link expansion are easy to realize. The voltage sharing of the direct current of each chain link and the PWM are carried out by the chain link controller, so the software design of the central controller is simplified.
Description
Technical field
The utility model belongs to Harmonious Waves in Power Systems compensation technique field, is specifically related to a kind of many level active power filters distributed control apparatus.
Background technology
Present chain type multi-level converter control system can reduce two types: 1. centralized control system; 2. scattered control system.Centralized control system only contains a central controller and bears all control tasks and chain link pulse width modulation (PWM) algorithm by it.Scattered control system then is made up of central controller and strand joint controller, and wherein part control task and chain link PWM produce algorithm and be assigned to the completion of strand joint controller.Existing chain type Active Power Filter-APF (APF) all adopts centralized control basically; The hardware configuration that central controller generally adopts digital signal processor DSP and on-site programmable gate array FPGA to combine; Wherein DSP accomplishes the upper strata control algolithm of APF, comprises dc capacitor mean control, dynamic harmonic Current Control and the Pressure and Control of chain link dc capacitor etc.; FPGA accomplishes the bottom modulation of chain type APF, is responsible for producing the pwm pulse of all chain links.Yet Pressure and Control strategy and PWM algorithm that this centralized control system will be originally can independently be accomplished by each chain link all are placed on the central controller completion.When installing chain number more for a long time, the software design of central controller is complicated on the one hand; On the other hand, central control circuit also must detect the dc capacitor voltage of each chain link in real time, has increased the complexity of hardware circuit greatly.Therefore traditional centralized control system is unfavorable for the expansion of chain type APF chain number.
Bring into play the advantage of chain type modular construction, must study the design and the problem of implementation of scattered control system.Document " Implementation and control of distributed PWM cascaded multilevel inverters with minimal harmonic distortion and common-mode voltage " has proposed a kind of scattered control system of cascade multilevel converter; Strand joint is made up of power cell independently; Adopt " back-to-back " structure; Be equipped with complete control system; But the method more complicated of modulating wave and carrier synchronization between the chain link, and the precision at phase-shifting carrier wave angle depends on each chain link lock phase precision, so the accurate phase shift between the chain link carrier wave is difficult realizes.Document " Practical Implementation of PWM synchronization and phase-shift method for cascaded H-Bridge multilevel inverters based on a standard serial communication protocol " is to many level of Cascade H-bridge motor driver; Proposition is based on the scattered control system of CAN bus; Adopt CAN bus transmitting control information between central controller and the strand joint controller; But because CAN bus data frame structure characteristics and communication speed restriction; This scheme is difficult to realize high-speed real-time control, for need carry out fast harmonic current, the APF of dynamic compensation is also inapplicable.
In addition, chain link dc capacitor voltage imbalance is the outstanding problem that cascade multilevel converter faces.Many documents are furtherd investigate this.Document " A generalized control strategy of per-phase DC voltage balancing for cascaded multilevel converter-based STATCOM "; " Individual voltage balancing strategy for PWM cascaded H-Bridge converter-based STATCOM " and " Small-signtal model-based control strategy for balancing individual DC capacitor voltages in cascade multilevel inverter-based STATCOM " proposed some new direct voltages and all pressed algorithm; Can obtain good result; But these algorithms need obtain the direct voltage of each chain link; If in scattered control system, realize; Must increase soft, the complexity of hardware of control system; Work as chain number more simultaneously, it also is a difficult problem that the sequential that each chain link direct voltage sampled value transmits in real time cooperates.
The utility model content
The purpose of the utility model is to provide a kind of many level active power filters distributed control apparatus; Adopt the upper control of central controller to save the mode that the next control combines with each strand; Each chain link is the integrated power unit with independent control; Realize the expansion of modularization and chain link more easily, each chain link direct voltage is all pressed with PWM and is modulated by the completion of this chain link controller, has simplified the software design of central controller.
Many level active power filters distributed control apparatus comprises central controller and three single-phase control units, and central controller provides modulation wave signal and carrier synchronization signal to each single-phase control unit respectively; Said single-phase control unit comprises more than one strand joint, and the strand joint comprises strand joint controller, IGBT drive circuit, Power Conversion bridge and direct voltage Acquisition Circuit; Said strand joint controller receives modulation wave signal and carrier synchronization signal from central controller; Direct voltage according to the collection of chain link direct voltage Acquisition Circuit is revised modulation wave signal, utilizes revised modulation wave signal and carrier synchronization signal to produce width-modulation pulse again and sends the IGBT drive circuit to; The IGBT drive circuit is controlled the harmonic compensation of realization to electrical network to the Power Conversion bridge under the effect of width-modulation pulse.
Further, said central controller comprises outer voltage control module, current-order synthesis module and current inner loop control module; The direct voltage that said outer voltage control module is gathered arbitrary strand joint in the single-phase control unit is made FEEDBACK CONTROL and is generated active current instruction amplitude I
S_pSaid current-order synthesis module is according to electric network voltage phase and I
S_pGenerate active current instruction instantaneous value i
S_p *Said current inner loop control module is to i
S_p *Make FEEDBACK CONTROL and generate modulation wave signal v
O_ref
Further, said strand joint controller according to following mode to the modulating wave signal correction:
The cosine amount t of
electric network voltage phase multiplies each other the absolute value of again this product being got.
The technique effect of the utility model is embodied in:
(1) each chain link is the integrated power unit with independent control, can produce the PWM driving pulse, realizes modularization more easily.
(2) each chain link direct voltage is realized " this locality " control by this chain link controller, need not to reach central controller, therefore can save the direct voltage sampled signal line between a large amount of central controllers and chain link controller, is convenient to system design and maintenance.
(3) each chain link direct voltage is all pressed with the PWM modulation algorithm and is accomplished by this chain link controller, has simplified the central controller software design.
Description of drawings
Fig. 1 is the utility model control system overall structure sketch map;
Fig. 2 is the central controller structured flowchart;
Fig. 3 is the central controller software flow pattern;
Fig. 4 is strand joint controller architecture block diagram;
Fig. 5 is strand joint controller software flow process;
Fig. 6 is carrier synchronization sketch map between the strand joint;
Fig. 7 is the signal of scattered control system networking mode.
Embodiment
Fig. 1 is the scattered control system overall construction drawing, v
sBe line voltage, v
cBe APF brachium pontis output voltage, i
sBe grid-connected current, L is for connecting inductance.Native system comprises a central controller and three single-phase control units; Single-phase control unit comprises a plurality of strand joints again; Each strand joint comprises strand joint controller, IGBT drive circuit, Power Conversion bridge and direct voltage Acquisition Circuit, the Power Conversion bridge phase cascade of each strand joint of same single-phase control unit.Fig. 1 has provided the example of a single-phase control unit, and this unit comprises three chain links.Controller is divided into central controller and strand joint controller, and central controller is positioned at the upper strata control circuit, and strand joint controller is positioned at each chain link inside.Adopt optical fiber to constitute the two-way data communication link between central controller and the strand joint controller, make upper strata control circuit and each chain link control circuit be isolated from each other.Central controller and strand joint controller all adopt TMS320F2812 type DSP as main control device.
Fig. 2 is the central controller controls theory diagram.Central controller can be divided into three parts: outer voltage controller, current-order synthesizer and current inner loop controller according to the function that realizes.That is to say; The structure that this control system has adopted voltage, current double closed-loop to control; Wherein, The outer voltage controller is with generating the active current command value, and the current-order synthesizer instructs the harmonic current-order to synthesize the transient current instruction of device output active current, and the current inner loop controller instructs to transient current and carries out tracking Control.The detailed operation principle of control system shown in Figure 2 is following: introduce dc voltage value V
DcEmbody device to meritorious demand, V as feedback quantity
DcWith dc capacitor voltage command value V
Dc *Error after the adjusting of voltage regulator Gv (z), generate active current instruction amplitude I
S_p, I
S_pMultiply by with the sine value sin ω t of the synchronous unit of line voltage and obtain active current instruction instantaneous value i
S_p *Harmonic current instruction instantaneous value i
S_h *With i
S_p *The transient current instruction i of overall apparatus output has just been synthesized in addition
s *Introducing device output current instantaneous value i
sAs feedback quantity and i
s *Relatively, its error generates modulation wave signal v after the current loop controller effect
O_ref, wherein current loop controller is by proportional controller P and repetitive controller G
1(z) be composited.Modulation wave signal v
O_refTo be transferred into each strand joint controller.Sin ω t is that phase-locked loop is through get the line voltage lock mutually.
Fig. 3 is the central controller software flow pattern.At first, central controller is to line voltage with output current is sampled and obtain the phase place of line voltage through phase locked algorithm.Then, direct voltage is carried out proportional integral (PI) regulate, obtain active current instruction i
S_p *, i
S_p *With harmonic current instruction i
S_h *The stack back generates total current instruction i
s *i
s *The controlled quentity controlled variable v that obtains through the current loop controller algorithm
O_ref, will be sent to each strand joint controller through SPI as the PWM modulation wave signal.
Fig. 4 is strand joint controller architecture block diagram.Among Fig. 4, ω t is an electric network voltage phase information, by central controller the line voltage lock is obtained mutually; Sign is-symbol discriminant function is used for judging the positive and negative of some variable; Abs is the operation function that takes absolute value, and is used for making amount trimmed Δ v
On_pRemain on the occasion of; v
OmIt is final modulation signal.Electric network voltage phase information ω t is transferred into strand joint controller and need not the special configuration signal transfer circuit, can it be synthesized to modulating wave v
O_refIn transmit together, can simplify hardware like this.Strand joint controller is finely tuned to realize all pressing amount trimmed Δ v dc capacitor voltage
On_pPositive negative direction by voltage error v
Dcn_errPositive and negative and phase current instantaneous value i
sPositive and negative common decision under the designated reference direction sees table 1 for details.
Table 1 Pressure and Control regulated quantity Δ v
C, NpChoose
Tab.1?Choice?of?balancing?control?quantity，Δv
c，Np
Fig. 5 is strand joint controller software flow chart.In each strand joint controller software program, strand joint controller at first receives the modulation wave signal v that central controller sends
O_refIn addition, strand joint controller also will be sampled and is sent to central controller the direct voltage of this chain link.The direct voltage sampled value is all pressed amount trimmed Δ v by the generation of Pressure and Control algorithm in strand joint controller
On_pv
O_refWith Δ v
On_pSynthetic and next regulated quantity v
OmTo produce the drive signal of each IGBT of this chain link by one pole frequency multiplication SPWM algorithm as final modulating wave.
Fig. 6 is carrier synchronization sketch map, wherein T between three chain links of a phase
SBe carrier cycle, the carrier synchronization signal of three chain links of the corresponding respectively phase of CAPSIG1, CAPSIG2, CAPSIG3.For guaranteeing to keep high accuracy and strict fixing phase difference between each chain link triangular carrier; Native system adopts the mode that produces synchronizing signal through central controller peripheral hardware hardware to realize phase-shifting carrier wave, and promptly the numerical value through the CMPR4 among the Configuration events manager B (EVB), CMPR5, CMPR6 makes PWM7, PWM9, three pins of PWM11 export three the tunnel and differs 1/3 carrier cycle (T
S) phase shift carrier synchronization signal.Catch mouthful (CAP) that this three-channel carrier phase shift synchronizing signal will be transferred to each strand joint controller DSP of every phase produces a capture interrupt.In the capture interrupt subprogram of each chain link controller DSP, start the general purpose timer counter that is used to produce triangular carrier, just can realize the phase shift relation between three chain link carrier waves of every phase.In the design of strand joint controller software, it is the highest to utilize mode such as interrupt nesting that the priority of capture interrupt is made as, and guarantees that it can or not interrupt by other interruption delay.Phase-shifting carrier wave relation between three chain links is produced by central controller hardware fully, and is irrelevant with software basically.The software systems of central controller can not influence the accurate phase shift relation between the synchronizing signal, make that synchronizing signal is stable and do not have " shake ".
Fig. 7 is the signal of the utility model scattered control system networking mode, and central controller is through carrying out real-time communication between interface circuit and each the chain link controller.Based on the own characteristic of chain type APF, scattered control system adopts different communication modes to accomplish the transmission of different types of data, makes a concrete analysis of as follows:
(1) modulation wave signal
Scattered control system is responsible for v by the upper strata control circuit
sAnd i
sSample, carried out two closed-loop controls of direct voltage and grid-connected current then by central controller, the modulation wave signal that will calculate gained at last is sent to each chain link controller simultaneously.Central controller adopts Direct Current Control, and the every control carrier cycle of modulation wave signal (166 μ s) upgrades once, and modulation wave signal requires than higher communication speed." control command " that be central controller must be delivered to each strand joint controller in time, apace.Otherwise be equivalent in the control structure figure of system forward path, increase a bigger phase delay link.This can make the scattered control system mis-behave, even causes system unstable.
Serial Peripheral Interface (SPI) (SPI) is that benchmark carries out the data transmission with the synchronised clock, does not have complicated frame structure, can realize the high speed serialization synchronous communication between main frame and the slave.Scattered control system adopts SPI to transmit modulation wave signal.
(2) chain link direct voltage sampled value
Each chain link dc voltage value is accomplished sampling by this chain link control circuit, and sampled data is uploaded to central controller on the one hand, realizes the direct voltage closed-loop control; It is inner to reach the chain link controller on the other hand, is used for realizing all pressing algorithm.Because the direct current pressure ring is in outer shroud; And chain link direct current capacity often big (so that reducing the fluctuation of direct voltage secondary); Be equivalent to a big inertial element, so central controller direct current pressure ring governing speed can be more a lot of slowly than grid-connected current ring governing speed.Per primitive period of central controller (20ms) is regulated a direct voltage.
A distinguishing feature of controller local area network (CAN) data frame structure is that data volume is bigger, but communication speed limited (the highest 1Mbps).In addition, the CAN bus adopts differential signal to realize that data transmit, and have higher anti-interference.Therefore adopt the CAN bus to transmit chain link direct voltage sampled value.
(3) phase-shifting carrier wave synchronizing signal
Native system adopts carrier synchronization signal CAPSIG1, CAPSIG2, the CAPSIG3 of three mutual phasing 1/3 carrier cycles of PWM mouth generation of central controller, is sent to the CAP mouth of three chain link controllers respectively through optical fiber.When chain number is many, can adopt special logic chip, like (complex programmable logic control) CPLD, produce the phase-shifting carrier wave synchronizing signal.Can guarantee to have stable phase shift synchronized relation between the chain link like this.
Claims (1)
1. many level active power filters distributed control apparatus is characterized in that, comprises central controller and three single-phase control units, and central controller provides modulation wave signal and carrier synchronization signal to each single-phase control unit respectively; Said single-phase control unit comprises more than one strand joint, and the strand joint comprises strand joint controller, IGBT drive circuit, Power Conversion bridge and direct voltage Acquisition Circuit; Said strand joint controller receives modulation wave signal and carrier synchronization signal from central controller; Direct voltage according to the collection of chain link direct voltage Acquisition Circuit is revised modulation wave signal, utilizes revised modulation wave signal and carrier synchronization signal to produce width-modulation pulse again and sends the IGBT drive circuit to; The IGBT drive circuit is controlled the harmonic compensation of realization to electrical network to the Power Conversion bridge under the effect of width-modulation pulse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204919394U CN202455073U (en) | 2011-12-01 | 2011-12-01 | Multilevel active power filter distributed control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204919394U CN202455073U (en) | 2011-12-01 | 2011-12-01 | Multilevel active power filter distributed control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202455073U true CN202455073U (en) | 2012-09-26 |
Family
ID=46870903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204919394U Withdrawn - After Issue CN202455073U (en) | 2011-12-01 | 2011-12-01 | Multilevel active power filter distributed control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202455073U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326548A (en) * | 2013-06-25 | 2013-09-25 | 广东电网公司电力科学研究院 | Method and system for capacitor voltage control of unified power quality controller |
| CN107612355A (en) * | 2017-10-17 | 2018-01-19 | 国网江苏省电力公司南通供电公司 | A kind of distributed director of modularization matrix converter |
| EP3955452A1 (en) * | 2020-08-14 | 2022-02-16 | Delta Electronics (Shanghai) Co., Ltd. | Conversion system and control method thereof |
| CN114079393A (en) * | 2020-08-14 | 2022-02-22 | 台达电子企业管理（上海）有限公司 | Conversion system and control method |
| US11496038B2 (en) | 2020-08-14 | 2022-11-08 | Delta Electronics (Shanghai) Co., Ltd. | Conversion system and control method |
-
2011
- 2011-12-01 CN CN2011204919394U patent/CN202455073U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326548A (en) * | 2013-06-25 | 2013-09-25 | 广东电网公司电力科学研究院 | Method and system for capacitor voltage control of unified power quality controller |
| CN107612355A (en) * | 2017-10-17 | 2018-01-19 | 国网江苏省电力公司南通供电公司 | A kind of distributed director of modularization matrix converter |
| CN107612355B (en) * | 2017-10-17 | 2020-07-03 | 国网江苏省电力公司南通供电公司 | Distributed controller of modular matrix converter |
| EP3955452A1 (en) * | 2020-08-14 | 2022-02-16 | Delta Electronics (Shanghai) Co., Ltd. | Conversion system and control method thereof |
| CN114079393A (en) * | 2020-08-14 | 2022-02-22 | 台达电子企业管理（上海）有限公司 | Conversion system and control method |
| US11496038B2 (en) | 2020-08-14 | 2022-11-08 | Delta Electronics (Shanghai) Co., Ltd. | Conversion system and control method |
| US11522438B2 (en) | 2020-08-14 | 2022-12-06 | Delta Electronics (Shanghai) Co., Ltd. | Conversion system and control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102208810A (en) | Distributed control system for cascaded multilevel active power filter | |
| CN202455073U (en) | Multilevel active power filter distributed control device | |
| CN102891500B (en) | Parallel control method of three-phase two-level inverter with isolation transformers | |
| CN103337875B (en) | Composite control method for grid-connected inverter based on repetitive control and disturbance observer | |
| CN102510120B (en) | Micro-grid inverter voltage and current double-ring hanging control method based on virtual impedance | |
| CN111371106B (en) | Phase-locked loop based three-phase four-leg inverter control system and control method | |
| US11424620B2 (en) | Three-phase expandable AC system based on battery reconfiguration and control method thereof | |
| US20130073109A1 (en) | Droop control system for grid-connected synchronization | |
| Fang et al. | State-space modeling and control of grid-tied power converters with capacitive/battery energy storage and grid-supportive services | |
| CN102611138A (en) | Delay-free single-phase photovoltaic synchronization power adjusting method | |
| CN102801346B (en) | Three-phase inverter with no-signal interconnecting lines connected in parallel and control method of three-phase inverter | |
| CN102185513A (en) | Parallel structure and control method for photovoltaic power generation grid-connected inverter | |
| CN110912208B (en) | Flexible direct current transmission converter control method based on improved droop controller | |
| CN107742899A (en) | A kind of quasi- z sources cascaded multilevel inverter grid-connected control method | |
| CN102946115B (en) | Based on the Three-Phase PWM Converter control method of LCL filter amphiorentation coordinate transform | |
| CN109004866A (en) | Hexagonal structure can present three port of type cascade converter topology and control method | |
| CN110112787A (en) | Light based on virtual synchronous generator stores up micro-grid connection presynchronization control method | |
| CN107994773A (en) | A kind of control method and system of photovoltaic DC-to-AC converter Boost circuit | |
| CN110086200A (en) | The control method for coordinating of series-parallel micro-capacitance sensor is mixed under a kind of island mode | |
| CN109510223A (en) | A kind of three-phase current unbalance administers controller, device and control method | |
| CN105391285A (en) | Three-phase PWM rectifier control method based on deadbeat and triangular wave comparison | |
| CN1312820C (en) | Parallel single-phase DC-to-AC converter systems | |
| CN102354990A (en) | Control system capable of realizing direct current (DC) capacitive voltage balance of H-bridge cascaded STATCOM (static synchronous compensator) | |
| CN101777776A (en) | Method for controlling intelligent PV grid-connected inverter based on synchro generator model | |
| CN108879797B (en) | Active power distribution network port PQ control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120926 Effective date of abandoning: 20130204 |
|
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |