CN107294095B - System and control method with harmonic voltage generation and ZIP virtual load - Google Patents
System and control method with harmonic voltage generation and ZIP virtual load Download PDFInfo
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- CN107294095B CN107294095B CN201710468735.0A CN201710468735A CN107294095B CN 107294095 B CN107294095 B CN 107294095B CN 201710468735 A CN201710468735 A CN 201710468735A CN 107294095 B CN107294095 B CN 107294095B
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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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- 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
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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 kind of system and control method with harmonic voltage generation and ZIP virtual load, including power grid, three-phase STS static state switching switch, module, three-phase series manifold type transformer group and ZIP virtual load module occur for harmonic voltage.Wherein the ZIP virtual load module by acquisition system output voltage electric current and gives external active power and reactive power, according to ZIP virtual load algorithm, realizes the foundation of ZIP virtual load model.A kind of system and control method with harmonic voltage generation and ZIP virtual load disclosed by the invention, both the local load in electric system can have been simulated, it can also realize the function of load on-site elimination, it can be applied to draw water energy storage, photovoltaic from a variety of occasions such as cleer and peaceful electric car, simultaneity factor is also equipped with the function of harmonic wave generation, improves the completeness and reliability of system.
Description
Technical field
The invention belongs to power quality analysis and control field, are related to a kind of with harmonic voltage generation and ZIP virtual negative
The system and control method of lotus can both simulate the local load in electric system, and can also realize the function of load on-site elimination
Can, from a variety of occasions such as cleer and peaceful electric car, simultaneity factor is also equipped with the function of harmonic wave generation for can be applied to draw water energy storage, photovoltaic
Can, improve the completeness and novelty of system.
Background technique
In electric system, the characteristics such as voltage magnitude caused by load changes and frequency variation are common existing in electric system
As off-grid operation control needs to set about from these fundamental problems thus, to propose reliable and effective solution.
Currently, the research about load model in electric system has become hot spot, as Chinese invention patent document is " a kind of
The modeling method of power system load " (publication number 101789598A) and " Dynamic Equivalence of middle small hydropower station cluster " (disclosure
Number 106651641A), in which:
" a kind of electric system is negative disclosed on July 28th, 2010 for Chinese invention patent application file (101789598A)
The modeling method of lotus ", the present invention classifies from load point, load model parameters polymerization, solve it is overall survey debate method identifiability and
The problem of more solutions, disclose a kind of modeling method of power system load；
Chinese invention patent application file (106651641A) disclosed on May 10th, 2017 " middle small hydropower station cluster
Dynamic Equivalence ", the present invention selects Equivalent Model for three rank parallel operation of generator static state ZIP load models, small power station in selection
Active power, reactive power, voltage, the frequency of cluster power transmission interconnection Phasor Measurements data, to input, are adopted as input data
Equivalent Model parameter is recognized with self adaptive control parameter improvement differential evolution algorithm.
Make a general survey of the existing granted patent about load model, there are the problem of it is as follows:
1, the foundation of load model can not simulate the local load in electric system, cannot more realize load on-site elimination
Function；
2, load model system is established not comprehensive enough on the basis of fundamental wave mostly, does not account for the feelings comprising harmonic voltage
Condition, and the presence of Harmonic in Power System voltage is widely, to need to be included within research range.
Summary of the invention
It is of the existing technology in order to solve the problems, such as, occur the invention discloses one kind with harmonic voltage and ZIP is virtual
The system and control method of load by acquisition system output voltage electric current and give external active power and idle function
Rate realizes the foundation of ZIP virtual load model according to ZIP virtual load algorithm, which can simulate in electric system
Local load, and realize the function of load on-site elimination.
The object of the present invention is achieved like this.
The present invention provides a kind of systems occurred with harmonic voltage with ZIP virtual load, including power grid, three-phase STS
Module, three-phase series manifold type transformer group and ZIP virtual load module occur for static state switching switch, harmonic wave；The harmonic wave hair
Raw module includes DC source, three-phase tri-level PWM inverter, three-phase LC filter and three-phase STS1Static state switching switch；It is described
ZIP virtual load module includes capacitor C, three-phase tri-level PWM converter and three-phase L-type filter；
The power grid three-phase output end connects one to one with three-phase STS static state switching switch input terminal, and described three
Phase STS static state switching output switching terminal connects one to one with three-phase series manifold type transformer group pair side input terminal；Institute
It states direct current source output terminal to connect one to one with the three-phase tri-level PWM inverter input terminal, the three-phase tri-level PWM is inverse
Become device output end and the inductance input terminal of the three-phase LC filter connects one to one, the capacitor of the three-phase LC filter is defeated
Outlet and the three-phase STS1Static state switching switch input terminal connects one to one, the three-phase STS1Static state switching switch output
End connects one to one with the three-phase series manifold type transformer group primary side input terminal, the three-phase series manifold type transformer
The capacitor neutral point N of group primary side output end and the three-phase LC filter is shorted；The three-phase series manifold type transformer group pair
Side output end connects one to one with the three-phase L-type filter input end, the three-phase L-type filter output and described three
Phase three-level pwm current transformer input terminal connects one to one, and the three-phase tri-level PWM converter output end and capacitor C are one by one
It is correspondingly connected with.
The present invention also provides a kind of control methods occurred with harmonic voltage with the system of ZIP virtual load, including
Following steps:
Step 1, three-phase series manifold type transformer group pair side output end three-phase phase in a switch periods is first acquired
Voltage ua、ub、ucWith three-phase current ia、ib、ic, then first pass through coordinate transform and respectively obtain three-phase phase voltage α beta -axis component uα、uβ
With three-phase current α beta -axis component iα、iβ, then locking phase angle γ obtained by phase-angle detection；
The coordinate transform formula is respectively as follows:
The phase-angle detection formula are as follows:
Step 2, the three-phase phase voltage α beta -axis component u according to obtained in step 1α、uβWith three-phase current α beta -axis component iα、iβ
And locking phase angle γ, three-phase phase voltage dq axis component u is obtained by coordinate transformd、uqWith three-phase current dq axis component id、iq；
The coordinate transform formula is respectively as follows:
ud=uβcosγ+uαsinγ
uq=-uβsinγ+uαcosγ
id=iβcosγ+iαsinγ
iq=-iβsinγ+iαcosγ
Step 3, the three-phase phase voltage dq axis component u according to obtained in step 2d、uq, give active-power Po, give idle
Power Qo, the three-phase phase voltage frequency departure amount △ f detected obtains three-phase current dq axis by ZIP virtual load algorithm
Instruct component idref、iqref；
The ZIP virtual load algorithmic formula are as follows:
Wherein, kpf,kqfThe respectively frequency variation coefficient of d axis and q axis, p1,p2,p3Respectively given ZIP virtual negative
Lotus middle impedance, electric current, power component ratio shared by q axis, q1,q2,q3Respectively given ZIP virtual load middle impedance, electricity
Stream, power component are in d axis proportion, if p1,p2,p3Summation, q1,q2,q3Summation is 1；
Step 4, the three-phase current dq axis component i according to obtained in step 2d、iqWith three-phase current dq obtained in step 3
Axis instructs component idref、iqref, the driving signal dq axis point of three-phase tri-level PWM converter is calculated by controller equation
Measure dd、dq, then the three-phase driving signal d of three-phase tri-level PWM converter obtained by coordinate transforma、dbAnd dc；
Controller equation are as follows:
Wherein, KpFor the proportionality coefficient of controller, KiFor the integral coefficient of controller, s is Laplace operator；
Coordinate transform formula are as follows:
Compared with the prior art, the invention has the benefit that
1, a kind of system and control method with harmonic voltage generation and ZIP virtual load disclosed by the invention, both may be used
To simulate the local load in electric system, it can also realize the function of load on-site elimination, can be applied to draw water energy storage, photovoltaic
From a variety of occasions such as cleer and peaceful electric car；
2, system has the function of harmonic wave generation, improves the completeness and reliability of system.
Detailed description of the invention
Fig. 1 is the system topology figure occurred with harmonic voltage with ZIP virtual load；
Fig. 2 is the System Control Figure occurred with harmonic voltage with ZIP virtual load.
Each section label and component corresponding relationship are as follows in figure:
Module occurs for 20- harmonic voltage
21- DC source
22- three-phase tri-level PWM inverter
30- three-phase series manifold type transformer group
40-ZIP virtual load module
41- three-phase tri-level PWM converter
Specific embodiment
Utilize Matlab/Simulink emulation platform building system model.
Referring to Fig.1, of the present invention to occur with the system of ZIP virtual load to include power grid, three-phase STS with harmonic voltage
Module 20, three-phase series manifold type transformer group 30 and ZIP virtual load module 40 occur for static state switching switch, harmonic wave；It is described
It includes DC source 21, three-phase tri-level PWM inverter 22, three-phase LC filter, three-phase STS that module 20, which occurs, for harmonic wave1Static state is cut
Change switch；The ZIP virtual load module 40 includes capacitor C, three-phase tri-level PWM converter 41, three-phase L-type filter.
The power grid three-phase output end connects one to one with three-phase STS static state switching switch input terminal, and described three
Phase STS static state switches output switching terminal and connects one to one with the 30 secondary side input terminal of three-phase series manifold type transformer group；
The direct current source output terminal connects one to one with 22 input terminal of three-phase tri-level PWM inverter, the three-phase tri-level
22 output end of PWM inverter and the inductance input terminal of the three-phase LC filter connect one to one, the three-phase LC filter
Capacitor output end and the three-phase STS1Static state switching switch input terminal connects one to one, the three-phase STS1Static state switching
Output switching terminal connects one to one with the 30 primary side input terminal of three-phase series manifold type transformer group, the three-phase series coupling
The capacitor neutral point N of box-like 30 primary side output end of transformer group and the three-phase LC filter is shorted；The three-phase series coupling
The secondary side output end of formula transformer group 30 connects one to one with the three-phase L-type filter input end, the three-phase L-type filter
Output end connects one to one with 41 input terminal of three-phase tri-level PWM converter, the three-phase tri-level PWM converter 41
Output end connects one to one with capacitor C.
In the present embodiment, power grid is that line voltage is 380V three-phase alternating current；21 voltage of DC source is 800V；Three-phase tri-level
PWM inverter 22 power grade 20KW, voltage rating 380V, switching frequency 16KHz；Three-phase LC filter inductance L1=
0.12mH, capacitor C1=30uF；30 no-load voltage ratio of three-phase series manifold type transformer group is 1；41 power of three-phase tri-level PWM converter
Grade 20KW, voltage rating 380V, switching frequency 16KHz, three-phase L-type filter inductance L2=0.12mH.
Described occurs with the system control method of ZIP virtual load referring to fig. 2 with harmonic voltage, including following step
It is rapid:
Step 1, three-phase series manifold type transformer group pair side output end three-phase phase in a switch periods is first acquired
Voltage ua、ub、ucWith three-phase current ia、ib、ic, then first pass through abc/ α β coordinate transform and respectively obtain three-phase phase voltage α β axis point
Measure uα、uβWith three-phase current α beta -axis component iα、iβ, then locking phase angle γ obtained by phase-angle detection.
Abc/ α β coordinate transform formula is respectively as follows:
Phase-angle detection formula are as follows:
Step 2, the three-phase phase voltage α beta -axis component u according to obtained in step 1α、uβWith three-phase current α beta -axis component iα、iβ
And locking phase angle γ, three-phase phase voltage dq axis component u is obtained by α β/dq coordinate transformd、uqWith three-phase current dq axis component id、
iq。
α β/dq coordinate transform formula is respectively as follows:
ud=uβcosγ+uαsinγ
uq=-uβsinγ+uαcosγ
id=iβcosγ+iαsinγ
iq=-iβsinγ+iαcosγ
Step 3, the three-phase phase voltage dq axis component u according to obtained in step 2d、uq, give active-power Po, give idle
Power Qo, three-phase current is calculated by ZIP virtual load algorithm in the three-phase phase voltage frequency departure amount △ f detected
Dq axis instructs component idref、iqref。
The ZIP virtual load algorithmic formula are as follows:
Wherein, kpf,kqfThe respectively frequency variation coefficient of d axis and q axis, p1,p2,p3Respectively given ZIP virtual negative
Lotus middle impedance, electric current, power component ratio shared by q axis, q1,q2,q3Respectively given ZIP virtual load middle impedance, electricity
Stream, power component are in d axis proportion, if p1,p2,p3Summation, q1,q2,q3Summation is 1.
Step 4, the three-phase current dq axis component i according to obtained in step 2d、iqWith three-phase current dq obtained in step 3
Axis instructs component idref、iqref, the driving signal dq axis point of three-phase tri-level PWM converter is calculated by controller equation
Measure dd、dq, then the three-phase driving signal d of three-phase tri-level PWM converter obtained by dq/abc coordinate transforma、dbAnd dc。
Controller equation are as follows:
Wherein, KpFor the proportionality coefficient of controller, KiFor the integral coefficient of controller, s is Laplace operator.This implementation
K is taken in examplep=1, Ki=10.
Dq/abc coordinate transform formula are as follows:
Claims (1)
1. a kind of control method occurred with harmonic voltage with the system of ZIP virtual load, wherein having harmonic voltage
System with ZIP virtual load includes power grid, three-phase STS static state switching switch, module (20) occur for harmonic wave, three-phase series couple
Formula transformer group (30) and ZIP virtual load module；It includes DC source (21), three-phase tri-level that module (20), which occur, for the harmonic wave
PWM inverter (22), three-phase LC filter and three-phase STS1Static state switching switch；The ZIP virtual load module (40) includes
Capacitor C, three-phase tri-level PWM converter (41) and three-phase L-type filter；
The power grid three-phase output end connects one to one with three-phase STS static state switching switch input terminal, the three-phase STS
Static state switching output switching terminal connects one to one with the secondary side input terminal of the three-phase series manifold type transformer group (30)；It is described
DC source (21) output end connects one to one with three-phase tri-level PWM inverter (22) input terminal, three electricity of three-phase
The inductance input terminal of flat PWM inverter (22) output end and the three-phase LC filter connects one to one, the three-phase LC filter
The capacitor output end of wave device and the three-phase STS1Static state switching switch input terminal connects one to one, the three-phase STS1It is static
Switching output switching terminal connects one to one with three-phase series manifold type transformer group (30) the primary side input terminal, the three-phase
The capacitor neutral point N of series coupled formula transformer group (30) primary side output end and the three-phase LC filter is shorted；The three-phase
Series coupled formula transformer group (30) pair side output end connects one to one with the three-phase L-type filter input end, and described three
Phase L-type filter output connects one to one with three-phase tri-level PWM converter (41) input terminal, three electricity of three-phase
Flat PWM converter (41) output end connects one to one with capacitor C；
It is characterized in that, this control method the following steps are included:
Step 1, the secondary side output end three-phase phase of the three-phase series manifold type transformer group (30) in a switch periods is first acquired
Voltage ua、ub、ucWith three-phase current ia、ib、ic, then first pass through coordinate transform and respectively obtain three-phase phase voltage α beta -axis component uα、uβ
With three-phase current α beta -axis component iα、iβ, then locking phase angle γ obtained by phase-angle detection；
The coordinate transform formula is respectively as follows:
The phase-angle detection formula are as follows:
Step 2, the three-phase phase voltage α beta -axis component u according to obtained in step 1α、uβWith three-phase current α beta -axis component iα、iβAnd lock
Phase angle γ obtains three-phase phase voltage dq axis component u by coordinate transformd、uqWith three-phase current dq axis component id、iq；
The coordinate transform formula is respectively as follows:
ud=uβcosγ+uαsinγ
uq=-uβsinγ+uαcosγ
id=iβcosγ+iαsinγ
iq=-iβsinγ+iαcosγ
Step 3, the three-phase phase voltage dq axis component u according to obtained in step 2d、uq, give active-power Po, give reactive power
Qo, the three-phase phase voltage frequency departure amount Δ f detected, by ZIP virtual load algorithm obtain three-phase current dq axis instruction
Component idref、iqref；
The ZIP virtual load algorithmic formula are as follows:
Wherein, kpf,kqfThe respectively frequency variation coefficient of d axis and q axis, p1,p2,p3Respectively hindered in given ZIP virtual load
Anti-, electric current, the power component ratio shared by q axis, q1,q2,q3Respectively given ZIP virtual load middle impedance, electric current, function
Rate component is in d axis proportion, if p1,p2,p3Summation, q1,q2,q3Summation is 1；
Step 4, the three-phase current dq axis component i according to obtained in step 2d、iqRefer to three-phase current dq axis obtained in step 3
Enable component idref、iqref, the driving signal dq axis point of three-phase tri-level PWM converter (41) is calculated by controller equation
Measure dd、dq, then the three-phase driving signal d of three-phase tri-level PWM converter (41) obtained by coordinate transforma、dbAnd dc；
Controller equation are as follows:
Wherein, KpFor the proportionality coefficient of controller, KiFor the integral coefficient of controller, s is Laplace operator；
Coordinate transform formula are as follows:
da=ddsinγ+dqcosγ
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| CN109193749B (en) * | 2018-07-23 | 2020-05-01 | 合肥工业大学 | Harmonic generation device based on recursive discrete Fourier transform and control method |
| CN117783757B (en) * | 2024-02-23 | 2024-05-14 | 山东华天电气有限公司 | Modularized simulation device and control method thereof |
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| CN102185337A (en) * | 2011-05-06 | 2011-09-14 | 深圳市禾望电气有限公司 | Grid stimulating device |
| CN204228843U (en) * | 2014-09-25 | 2015-03-25 | 上海市质量监督检验技术研究院 | A kind of AC network simulator topological structure |
| CN106487240A (en) * | 2015-08-28 | 2017-03-08 | 中国电力科学研究院 | A kind of grid simulator with accurate harmonic voltage and virtual impedance control |
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| CN102185337A (en) * | 2011-05-06 | 2011-09-14 | 深圳市禾望电气有限公司 | Grid stimulating device |
| CN204228843U (en) * | 2014-09-25 | 2015-03-25 | 上海市质量监督检验技术研究院 | A kind of AC network simulator topological structure |
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