CN106684883A - Chained STATCOM modularized decoupling reactive compensation device - Google Patents
Chained STATCOM modularized decoupling reactive compensation device Download PDFInfo
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- CN106684883A CN106684883A CN201510749211.XA CN201510749211A CN106684883A CN 106684883 A CN106684883 A CN 106684883A CN 201510749211 A CN201510749211 A CN 201510749211A CN 106684883 A CN106684883 A CN 106684883A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a modularized decoupling-based chained STATCOM reactive compensation device. The device comprises a chained STATCOM main circuit topology, an independent design scheme of a fundamental wave and harmonic wave compensation controller, and a DSP and FPGA-based master-slave type multi-CPU control system, wherein the chained STATCOM main circuit topology is used for realizing the reactive compensation tasks of fundamental waves and harmonic waves via an independent H bridge module by adoption of a decoupling principle; the independent design scheme in based on orthogonal characteristics of the fundamental waves and harmonic waves; and the DSP and FPGA-based master-slave type multi-CPU control system comprises a main controller which is used for realizing the acquisition and processing of signals and controlling the output of the signals and a split-phase controller which is used for completing the pulse generation and distribution. According to the device disclosed by the invention, the integrated innovation of fundamental wave and harmonic wave reactive compensation of middle-high voltage reactive compensation devices is realized, the contradiction between system capacity and switch frequency is relieved, the design and control algorithms of the controllers are simplified, the compensation effect is improved, the hardware cost is saved, and important promotion action is provided to improve the reactive compensation performance of STATCOM.
Description
Technical field
The present invention relates to a kind of reactive power compensator, more specifically, it relates to a kind of decoupling of chain type STATCOM modularity
Fundamental wave reactive power is compensated and specific subharmonic cancellation element.
Background technology
With the fast development of power industry, a large amount of non-linear and impact loads access electrical networks, meanwhile, wind-powered electricity generation and photovoltaic generation
Surf the Net successively Deng non-linear power, cause the power quality problems such as voltage pulsation, Voltage Drop and harmonic wave increasingly sophisticated, electricity
Force system harmonic wave control and reactive-load compensation have become the key subjects that field of power is faced, are more and more closed
Note, many countries all give enough attention to this, and STATCOM has obtained extensive research in reactive-load compensation, and opens
Beginning is applied in the middle of power system.With the construction of intelligent grid, traditional reactive power compensator has no longer adapted to it
Exhibition requires that new programme will be related to realize the electricity such as the energy-saving of electrical network, the recovery of research trends voltage, dynamic passive compensation
Energy Quality Control Technology, improves operation and transfer efficiency, cuts operating costs, and improves assets and invests utilization rate.
The construction of intelligent grid will progressively be transformed on the basis of existing electrical network, other idle benefits such as electric capacitor and SVC
Repay equipment to be still widely used, SVC device adopts phase control principle, while dynamic regulation First Harmonic Reactive Power, produce a large amount of
Harmonic wave；Electric capacitor equipment due to quality problems itself, cut throwing operational issue and system harmonicses pollute the problems such as, usually go out
Existing capacitor fuse link " group is quick-fried " phenomenon.If it is considered that other reactive power compensators and STATCOM cooperations,
It is highly significant that STATCOM carry out PFC harmonic simultaneously to eliminate.In addition, high-power in high energy consumption enterprise
Power electronics load due to operating mode conversion frequently and harmonic content is higher, in order to ensure power supply quality, often carry out Large Copacity without
Work(also needs to effectively suppress each harmonic while compensation.
The reactive-load compensation harmonic of mesolow STATCOM is eliminated, and related content has had both at home and abroad many researchs, and has into
Ripe product.But the resistance to voltage levels of power device that it faces in high-power application are higher, volume cost remains high and middle height
The problems such as electric current is larger in pressure local compensation, serious and devices switch frequency of generating heat is not high is all urgently studied and solved.
The content of the invention
Present invention aims to STATCOM compensate at the same time fundamental wave harmonic it is idle when, the high voltage great Rong for existing
Contradiction between amount and switching frequency, proposes a kind of Scheme of Reactive Power Compensation of modularity decoupling.
In order to solve above-mentioned contradiction, the technical solution used in the present invention is as follows：
Using chain type STATCOM topological structure as shown in Figure 1, per being composed in series by some single-phase H bridges, H bridges are divided into two
Group, using principle of stacking, c1-cnFor compensating reactive power electric current, h1-hnFor harmonic carcellation, the harmonic wave for being compensated as needed will
Ask, each particular harmonic compensating module can also adopt plural serial stage.The equivalent of fundamental wave module harmonic module is drawn according to Fig. 1
Circuit is as shown in Figure 2.WithThe fundamental voltage harmony wave voltage of STATCOM outputs is represented respectively.Fundamental wave reactive power compensation
Primary goal is quickly and accurately compensating reactive power electric current, and the change of instruction current is anxious unlike curent change during compensation harmonic
Play, in stable state, reactive-load compensation is not high to the rapidity requirement of actuator, so the switching tube frequency of compensating reactive power electric current can be with
It is lower, the higher switching tube of electric pressure can be adopted；The switching tube frequency of compensation harmonic is then needed according to institute's compensation harmonic
Frequency determines, using the relatively low switching tube of electric pressure.
Fundamental wave model according to Fig. 2 equivalent circuits STATCOM in d-q coordinate systems is：
The control to being input into reactive current is convertible into the control of input power factor, to reach predetermined power factor, design such as Fig. 4
Shown controller, during φ=0, under stable situation, the fundametal compoment q shaft current of load and inverter is equal in magnitude, symbol phase
Instead, only absorb active from electrical network as an entirety with STATCOM so as to load, realize unity power factor correction.For solution
When certainly operating mode is mutated, the DC side overvoltage that conventional PI algorithm responses speed is caused slowly, for fundamental wave module is calculated using sliding formwork control
Method.
Harmonic wave mathematical model according to Fig. 2 equivalent circuits STATCOM in d-q coordinate systems is respectively：
The control targe of harmonic wave module is a certain particular harmonic that eliminate load, and after decoupling compensation, harmonic compensation control is able to
Simplify.Design controller as shown in Figure 5, the instruction current of compensation required for being calculated by frequency analyses, then with maintenance
Fundamental current instruction required for DC-side Voltage Stabilization is added, and obtains generally referring to make electric current, finally by tracing control so that
Harmonic wave module output one is equal in magnitude with the load current for needing compensation, and electric current in opposite direction is offset therewith, so as to control electricity
Ource electric current is fundamental wave form.
Apparatus of the present invention control system adopts master-slave mode multi-CPU structure, as shown in Figure 6.Master controller acquisition system voltage electricity
The signals such as stream, load current, complete the voltage stabilization closed loop control of STATCOM, and it is phased that its controlled output sends three-phase separate to
Device processed；Phase-division based controller completes pulse generation and pulse distribution to each power model, and power model status information is returned to into master
Controller.
The invention has the beneficial effects as follows：The present invention increased on the basis of traditional chain type STATCOM Scheme of Reactive Power Compensation
Specific subharmonic eliminates function, and realizes the uneoupled control of fundamental wave and specific subharmonic.
Description of the drawings：In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to implementing
Accompanying drawing used in example or description of the prior art is briefly described.
Fig. 1 is that the present invention adopts chain type STATCOM main circuit topological structure；
Fig. 2 is chain type STATCOM equivalent circuit；
Fig. 3 is conventional STATCOM control block diagrams；
Fig. 4 is the fundamental wave unit control block diagram of the present invention；
Fig. 5 is the harmonic wave unit control block diagram of the present invention；
Fig. 6 is that the present invention adopts control system to constitute block diagram.
Specific embodiment
The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention are easier to
It is readily appreciated by one skilled in the art, apparent clearly defines so as to make to protection scope of the present invention.
With reference to shown in Fig. 1, the present embodiment provides a kind of chain type STATCOM modularity and decouples Scheme of Reactive Power Compensation, realizes base
Ripple reactive-load compensation and specific subharmonic are eliminated, and its specific principle is typical nonlinear load, and the amplitude of its harmonic wave is with frequency
The increase of rate and reduce, harmonic amplitude is far smaller than fundamental wave, and with the increase of overtone order, amplitude reduces, therefore this programme can
To be equivalent to a set of synchronization reactive compensator and a set of active filter cooperation, but can be used for mesohigh occasion, harmonic wave
Module can be operated under the DC voltage for gradually reducing, and harmonic wave module switch frequency can gradually increase.
The present invention carry out fundamental wave harmonic detect when, in order to avoid the wave filter in conventional method is used, using discrete Fourier
Leaf change algorithm, realizes that fundamental wave harmonic is separated, while drawing fundamental wave harmonic amplitude phase information, simplifies detection process, section
About hardware cost.
When operating mode changes, for example there is unbalanced fault in electrical network, and the phase angle that can cause busbar voltage is undergone mutation, by
STATCOM phase shifts when reactive current is controlled are caused in phaselocked loop angular deviation, so that containing some in electric current
Active, and adopt PI to adjust, the governing speed of DC voltage control ring is slower, and DC voltage control do not exist at short notice
Setting value, ultimately causes DC capacitor voltage rising and reaches overpressure value, and STATCOM is out of service, in addition, the control is in abc
Under coordinate system, there is steady-state error in control, and the program needs to press measure.The present invention be controlled device design when, in order to
Overcome the shortcomings of conventional control, using the control strategy of sliding moding structure, as shown in Figure 4 and Figure 5.
Fundamental wave module control targe has three：First PFC；It two is total DC voltage control；It three is
Detached DC bus-bar voltage Balance route in phase.Different from other control programs, this project is using each fundamental wave unit DC side electricity
Pressure separate control solution, so not needing extra controller to adjust total DC voltage.
In harmonic wave module, in order to maintain DC voltage minimum, its reference voltage is automatically adjusted with harmonic wave situation, adjusts mesh
It is constant that mark is to maintain modulation ratio.
Fig. 6 master controller functions are as follows：
Power panel：5V and 12V needed for controller are provided by DC/DC and control power supply；
Signal plate：Each busbar voltage and valve body current signal are converted by PT, CT；On-site signal is gathered and controlled by I O ring section；
Master control borad one：The controlling unit of core, is realized based on DSP and FPGA, completes to sample, calculate and monitor communication etc.；
Master control borad two：The controlling unit of core, is realized based on DSP and FPGA, completes spectrum analyses, the idle dynamic control of core
Harmonic compensation policy；
Master Communications plate：Realized based on FPGA, complete the communication between master controller and phase-division based controller；
Each phase-division based controller is made up of following board：
1) pulse generation plate：The closed loop control output signal of master control borad is received, all control pulses of the phase converting link are sent；
2) main pulse distribution plate plate：Realized based on FPGA, and Master Communications board communications, the information of each pulse distribution plate is collected into transmission
To master control borad, and the command signal of master control borad is distributed to into each pulse distribution plate.
3) pulse distribution plate：Realized based on FPGA, pulse signal is separately sent to into each chain link；The status information of collection chain link,
Control is sent to chain link and protect instruction.
Above example is used for illustrative purposes only, rather than limitation of the present invention, person skilled in the relevant technique,
Various conversion or modification, therefore the technical side of all equivalents without departing from the spirit and scope of the present invention, can also made
Case should also belong to scope of the invention, should be limited by each claim.
Claims (4)
1. a kind of reactive power compensator based on chain type STATCOM, it is characterised in that：Realize that the function that fundamental wave reactive power compensation and specific subharmonic are eliminated is integrated, and the contradiction between energy effectively solving power system capacity and switching frequency, can be used for mesohigh occasion.
2. reactive power compensator is designed according to claim 1, it is characterised in that：Main circuit adopts chain structure, per being mutually all composed in series by some single-phase bridges, fundamental wave module harmonic module is classified as, the elimination function of compensating fundamental wave and specific subharmonic is realized by independent module, due to fundamental wave and the orthogonal property of each harmonic, controller can independent design.
3. controller is designed according to claim 2, specifically include the following steps：
Step one：According to chain type STATCOM modularity decoupling topology, fundamental wave reactive power compensating module harmonic compensating module equivalent circuit is obtained；
Step 2：Fundamental wave harmonic module mathematical model under d-q coordinate systems is set up according to equivalent circuit；
Step 3：According to Design of Mathematical Model fundamental wave unit harmonic cell controller.
4. according to right 2 and the design control system of right 3, it is characterized in that using DSP and FPGA as main control chip master-slave mode multi-CPU structure, the signals such as master controller acquisition system voltage x current, load current, and carry out the parallel parsing of signal and process, the fundamental wave reactive power compensation harmonic for completing STATCOM eliminates stable closed loop control, and its controlled output sends three-phase phase-division based controller to；Phase-division based controller completes pulse generation and pulse distribution to each power model, and power model status information is returned to into master controller.
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| CN201510749211.XA CN106684883A (en) | 2015-11-06 | 2015-11-06 | Chained STATCOM modularized decoupling reactive compensation device |
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| CN201510749211.XA CN106684883A (en) | 2015-11-06 | 2015-11-06 | Chained STATCOM modularized decoupling reactive compensation device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108008668A (en) * | 2017-11-04 | 2018-05-08 | 国网江西省电力公司电力科学研究院 | A kind of method of the large-scale parallel data sampling control sequential based on DSP-FPGA |
| CN108899849A (en) * | 2018-08-22 | 2018-11-27 | 南京南瑞继保电气有限公司 | A kind of mixed type deicing device and control method and control device |
| WO2019009706A1 (en) * | 2017-07-05 | 2019-01-10 | Technische Universiteit Delft | Power grid and flexible current transmission system forming part thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019009706A1 (en) * | 2017-07-05 | 2019-01-10 | Technische Universiteit Delft | Power grid and flexible current transmission system forming part thereof |
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| CN108008668A (en) * | 2017-11-04 | 2018-05-08 | 国网江西省电力公司电力科学研究院 | A kind of method of the large-scale parallel data sampling control sequential based on DSP-FPGA |
| CN108899849A (en) * | 2018-08-22 | 2018-11-27 | 南京南瑞继保电气有限公司 | A kind of mixed type deicing device and control method and control device |
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Application publication date: 20170517 |