CN108711861A - A kind of voltage dip generator control method - Google Patents
A kind of voltage dip generator control method Download PDFInfo
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- CN108711861A CN108711861A CN201810434209.7A CN201810434209A CN108711861A CN 108711861 A CN108711861 A CN 108711861A CN 201810434209 A CN201810434209 A CN 201810434209A CN 108711861 A CN108711861 A CN 108711861A
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
Abstract
The present invention discloses a kind of voltage dip generator control method, including：Set Voltage Drop time, voltage dip type and positive and negative, zero sequence voltage phasor reference value；According to positive and negative, zero sequence voltage phasor with reference to the phase voltage reference vector being worth in three-phase coordinate system；Phase voltage reference vector in three phase coordinate systems is obtained into the voltage reference vector under dq coordinate systems through rotating coordinate transformation；Reverse rotation transformation is carried out to the reference vector under dq coordinate systems, obtains the reference voltage under three phase coordinate systems；Reference voltage under three phase coordinate systems is generated into load side inverter switching device management and control signal through space vector pulse width modulation；When the active load running of voltage dip generator band, implementing power control when voltage dip generator band passive load is run to net side inverter makes net side inverter work in rectification state.The present invention can control voltage dip generator and more fully simulate various types voltage dip, and specific power grid environment is provided for active electric power electronic equipment.
Description
Technical field
The present invention relates to technical field of power systems, more particularly to a kind of voltage dip generator control method.
Background technology
Since the 1980s, information technology continues to develop, and digital control technology obtains rapid proliferation and hair
Exhibition, more and more automation equipments apply in modern industrial production and people's life, numerically-controlled machine tool, network server, doctor
The various sensibility loads such as equipment and automatic production line are treated largely to access in electric system.These precision equipments be substantially with
Microprocessor or computer are core, therefore the requirement to power grid power quality is more much higher than traditional equipment.In addition, in some biographies
In industry of uniting, if the protective relaying device in securities exchange center, subway, papermaking, telecommunications, elevator and electric system is to electricity
Harmonic wave, overvoltage, the voltage swell (drop) of net etc. are all very sensitive, and any power quality problem may all lead to fault condition
Occur, causes the interruption of production, communication or traffic.At the same time, modern electric load configuration has occurred that compared with tradition
Large change, more and more power electronic equipments are used in production and life, such as reactive power compensator and electric locomotive
On thyristor rectifier, the electric arc furnaces that uses of smelting iron and steel enterprise and the current transformer in furnace of calcium carbide, wind-power electricity generation and photovoltaic
Inverter group in power generation etc. while bringing convenient, also causes Nonlinear Load in Power Network to increase rapidly, electric energy matter
Amount constantly declines, and the various problems such as the increase of mains frequency deviation, wave distortion, voltage fluctuation and flicker occurs, gives electric system
Operation brings many very important hidden danger.
Accurate electrical equipment, sensitive illumination lamps and lanterns and A.C. contactor, low pressure trip currently, existing scholar begins one's study
Device etc. is influenced by voltage dip, and research means are mainly the experimental study based on theory analysis.Therefore, in order to targetedly
It is tested, is badly in need of developing the equipment for generating various voltage signals for meeting national standard, to test Devices to test to electricity
Press the immunity characteristic of quality.But current three-phase voltage sag generation method generate voltage dip event order of accuarcy with
And there is also deficiencies for scope of application of experimental test etc., are embodied in：(1) existing voltage dip generation technique exists
Limitation cannot comprehensively, accurately reflect the various voltage dip types that three-phase system may occur, and what is especially generated is temporary
Drop voltage be difficult to meet in three-phase fault voltage phase relation and magnitude relation between phase and phase；(2) existing voltage is temporary
Drop generator energy generally can only be it is unidirectional from power grid to load transmit, be only applicable to " electrical equipment " networking electric property
Test and experiment when use, consider active equipment (such as photovoltaic combining inverter, active filter, static reacance occur
The power qualities adjustment control apparatus such as device (SVG)) access power grid when electric performance test and experiment requirement, energy is
It is transmitted to power grid from active equipment.Therefore, it studies and the voltage dip generator of Two-way energy transfer can be achieved and its in different electricity
Stable operation control strategy under net environment has certain practical significance.
Invention content
Technical problem to be solved by the present invention lies in provide a kind of voltage dip generator control method, with comprehensive mould
The function of quasi- various types voltage dip is realized that voltage dip generator can be with the function of active load running, and is ensured not
Balance the reliable and stable operation of voltage dip generator under power grid environment.
In order to solve the above technical problem, the present invention provides a kind of voltage dip generator control methods, including following step
Suddenly：
Step S1, setting Voltage Drop time, voltage dip type and positive and negative, zero sequence voltage phasor reference value；
Step S2 is referred to according to positive and negative, zero sequence the voltage phasor with reference to the phase voltage being worth in three-phase coordinate system
Vector；
Phase voltage reference vector in three phase coordinate systems is obtained the electricity under dq coordinate systems by step S3 through rotating coordinate transformation
Press reference vector；
Step S4 carries out reverse rotation transformation to the reference vector under dq coordinate systems, obtains the reference electricity under three phase coordinate systems
Pressure；
Reference voltage under three phase coordinate systems is generated load side inverter switching device by step S5 through space vector pulse width modulation
Management and control signal；
Step S6 when the active load running of voltage dip generator band, implements power control, voltage is temporary to net side inverter
When dropping generator band passive load operation, net side inverter is made to work in rectification state.
Wherein, the step S1 is specifically included：
According to short-circuit fault of power system type, sets positive and negative, zero sequence voltage phasor according to symmetrical component method and refer to
Value.
Wherein, the step S4 is specifically included：
For the fault type without zero sequence voltage component, reverse rotation transformation is carried out using following formula：
For the fault type containing zero-sequence component, reverse rotation transformation is carried out using following formula：
Wherein, in the step S6, in the active load running of voltage dip generator band, using Second Order Generalized Integrator
Carry out the separation of positive and negative sequence voltage.
Wherein, the step S6 is specifically included：
Step S61, when the active load running of voltage dip generator band, according to symmetrical component method, by unbalance voltage point
Solution is positive sequence, negative phase-sequence, zero-sequence component；
Step S62 carries out Clark transformation to positive sequence voltage component and negative sequence voltage components, obtains in static coordinate respectively
Positive sequence voltage component and negative sequence voltage components under system；
Step S63, using Second Order Generalized Integrator respectively to the positive sequence voltage component and negative phase-sequence under the rest frame
Component of voltage carries out orthogonal processing to realize that positive and negative sequence voltage detaches.
Wherein, further include after the step S63：
Utilize isolated positive sequence voltage component Vα +、Vβ +, electric current at this time is calculated according to instantaneous power theory and is referred to
It enables：
Wherein, the DC bus-bar voltage U that actual samples obtaindcWith its reference value UdcrefDifference after the pi regulator
To P*, Q*It is taken as 0；
According to the current-order i being calculatedα *、iβ *, net is realized in two-phase stationary coordinate system using PR resonant controllers
The grid-connected PQ power controls of side inverter.
The advantageous effect of the embodiment of the present invention is：
Voltage dip generator can be controlled and more fully simulate various types voltage dip；
It can realize the active load running of voltage dip generator band, be a series of active electric powers such as photovoltaic DC-to-AC converter, APF
Electronic equipment provides the specific power grid environment for carrying out characteristic test；
When load running active for guarantee voltage dip generator band, effective stable operation of net side inverter utilizes two
Rank Generalized Integrator improves whole system performance as the positive and negative sequence voltage separator of power grid.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of flow diagram of voltage dip generator control method of the embodiment of the present invention.
Fig. 2 is a kind of principle schematic of voltage dip generator control method of the embodiment of the present invention.
Fig. 3 is the structural schematic diagram of Second Order Generalized Integrator in the embodiment of the present invention.
Specific implementation mode
The explanation of following embodiment is refer to the attached drawing, can be to the specific embodiment implemented to the example present invention.
It please refers to shown in Fig. 1, the embodiment of the present invention provides a kind of voltage dip generator control method, including following step
Suddenly：
Step S1, setting Voltage Drop time, voltage dip type and positive and negative, zero sequence voltage phasor reference value；
Step S2 is referred to according to positive and negative, zero sequence the voltage phasor with reference to the phase voltage being worth in three-phase coordinate system
Vector；
Phase voltage reference vector in three phase coordinate systems is obtained the electricity under dq coordinate systems by step S3 through rotating coordinate transformation
Press reference vector；
Step S4 carries out reverse rotation transformation to the reference vector under dq coordinate systems, obtains the reference electricity under three phase coordinate systems
Pressure；
Reference voltage under three phase coordinate systems is generated load side inverter switching device by step S5 through space vector pulse width modulation
Management and control signal；
Step S6 when the active load running of voltage dip generator band, implements power control, voltage is temporary to net side inverter
When dropping generator band passive load operation, net side inverter is made to work in rectification state.
Shown in Fig. 2, in step S1, short-circuit fault of power system is divided into symmetrical and asymmetric two major classes, the present invention
Positive and negative, zero-sequence component feature, is classified as seven class of A, B, C, D, E, F, G when embodiment is according to different type short trouble, has
Shown in body figure following table：
1 all types of failures of table, three order components value
In upper table,For Voltage Reference phasor,Respectively positive and negative, residual voltage phasor reference value, A
It is temporarily dropped for three-phase symmetric voltage, B is single-phase grounding fault, and C, D are two-phase phase fault, and E, F, G are two phase ground
Short trouble.
In step S1, positive and negative, residual voltage phasor reference value will be set according to short trouble type shown in table 1
In step S2, according to positive and negative, the residual voltage phasor reference value set in step S1 It is available
Phase voltage reference vector E in three phase coordinate systemsref, calculation formula is as follows：
Wherein , []TIndicate the transposition of vector, j is imaginary factor, ω0For network voltage fundamental wave angular frequency, t is the time.
Through rotating coordinate transformation in step S3, the voltage reference vector V under dq coordinate systems is obtainedref, calculation formula is such as
Under：
Step S4 is to the voltage reference vector V under dq coordinate systemsrefImplement reverse rotation transformation, obtains under three phase coordinate systems
Reference voltage：Va、Vb、Vc。
Wherein, for the fault type without zero sequence voltage component, used reverse rotation transformation such as following formula：
In above formula, ω is each corresponding angular frequency of sequence voltage component (rad/s).
For the fault type containing zero-sequence component, reverse rotation transformation is revised as following formula：
By the reference voltage V under three phase coordinate systems in step S5a、Vb、VcThrough space vector pulse width modulation (Space
Vector Pulse Width Modulation, SVPWM) generate load side inverter switching device management and control signal.
Step S6 to the control mode of net side inverter in two kinds of situation：
(1) the active load running of voltage dip generator band
When with active load running, net side inverter need to work in inverter mode, thus will to implementing power control,
Detailed process is as follows：
Step S61, according to symmetrical component method, unbalance voltage can be analyzed to positive sequence, negative phase-sequence, zero-sequence component, physical relationship
It is as follows：
For three-wire system, without considering that residual voltage influences.Therefore, step S62 carries out formula (6), (7)
Simultaneously abbreviation can obtain for Clark transformation：
Wherein, Vα +、Vβ +The component for being positive sequence voltage in rest frame；Vα -、Vβ -It is negative sequence voltage in rest frame
In component；Q=e-jπ2.Therefore, in step S63, Second Order Generalized Integrator SOGI (Second Order are utilized
Generalized Integrator, SOGI) respectively to Vα、VβOrthogonal processing is carried out to realize that positive and negative sequence voltage detaches.
The structure chart of SOGI is as shown in figure 3, can deduce that its transmission function is：
Analytical formula (10), (11) it is found that when be arranged ω ' be equal to input signal frequency when, by：
According to formula (22) it is found that SOGI can realize the orthogonal processing to input signal well.
Utilize isolated power grid positive sequence fundametal compoment：Vα +、Vβ +, then according to instantaneous power theory, calculate at this time
Current-order：
Wherein, the DC bus-bar voltage U that actual samples obtaindcWith its reference value UdcrefDifference after the pi regulator
To P*, Q*Generally it is taken as 0.
According to the current-order i being calculatedα *、iβ *, net is realized in two-phase stationary coordinate system using PR resonant controllers
The grid-connected PQ power controls of side inverter maintain DC bus-bar voltage to stablize, make whole system stable operation.
(2) voltage dip generator band passive load is run
When band passive load operation, net side inverter need to only work in rectification state, without (1) kind situation
Control strategy.
By above description it is found that compared with prior art, the advantageous effect that the embodiment of the present invention is brought is：
Voltage dip generator can be controlled and more fully simulate various types voltage dip；
It can realize the active load running of voltage dip generator band, be a series of active electric powers such as photovoltaic DC-to-AC converter, APF
Electronic equipment provides the specific power grid environment for carrying out characteristic test；
When load running active for guarantee voltage dip generator band, effective stable operation of net side inverter utilizes two
Rank Generalized Integrator improves whole system performance as the positive and negative sequence voltage separator of power grid.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, therefore equivalent changes made in accordance with the claims of the present invention, is still within the scope of the present invention.
Claims (6)
1. a kind of voltage dip generator control method, includes the following steps：
Step S1, setting Voltage Drop time, voltage dip type and positive and negative, zero sequence voltage phasor reference value；
Step S2, according to positive and negative, zero sequence the voltage phasor with reference to the phase voltage being worth in three-phase coordinate system with reference to arrow
Amount；
Phase voltage reference vector in three phase coordinate systems is obtained the ginseng of the voltage under dq coordinate systems by step S3 through rotating coordinate transformation
Examine vector；
Step S4 carries out reverse rotation transformation to the reference vector under dq coordinate systems, obtains the reference voltage under three phase coordinate systems；
Reference voltage under three phase coordinate systems is generated load side inverter switching device management and control by step S5 through space vector pulse width modulation
Signal processed；
Step S6 when the active load running of voltage dip generator band, implements power control, voltage dip hair to net side inverter
When raw device band passive load is run, net side inverter is made to work in rectification state.
2. control method as described in claim 1, which is characterized in that the step S1 is specifically included：
According to short-circuit fault of power system type, positive and negative, zero sequence voltage phasor reference value is set according to symmetrical component method.
3. control method as described in claim 1, which is characterized in that the step S4 is specifically included：
For the fault type without zero sequence voltage component, reverse rotation transformation is carried out using following formula：
For the fault type containing zero-sequence component, reverse rotation transformation is carried out using following formula：
4. control method as described in claim 1, which is characterized in that in the step S6, carried in voltage dip generator
When the load running of source, the separation of positive and negative sequence voltage is carried out using Second Order Generalized Integrator.
5. control method as claimed in claim 4, which is characterized in that the step S6 is specifically included：
When the active load running of voltage dip generator band, according to symmetrical component method, unbalance voltage is decomposed by step S61
Positive sequence, negative phase-sequence, zero-sequence component；
Step S62 carries out Clark transformation to positive sequence voltage component and negative sequence voltage components, obtains under rest frame respectively
Positive sequence voltage component and negative sequence voltage components；
Step S63, using Second Order Generalized Integrator respectively to the positive sequence voltage component and negative sequence voltage under the rest frame
Component carries out orthogonal processing to realize that positive and negative sequence voltage detaches.
6. control method as claimed in claim 5, which is characterized in that further include after the step S63：
Utilize isolated positive sequence voltage component Vα +、Vβ +, current-order at this time is calculated according to instantaneous power theory：
Wherein, the DC bus-bar voltage U that actual samples obtaindcWith its reference value UdcrefDifference P is obtained after pi regulator*,
Q*It is taken as 0；
According to the current-order i being calculatedα *、iβ *, realize that net side is inverse in two-phase stationary coordinate system using PR resonant controllers
Become the grid-connected PQ power controls of device.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244167A (en) * | 2019-07-11 | 2019-09-17 | 西南交通大学 | The detection method of three-phase inverter short trouble |
| CN110687344A (en) * | 2019-10-24 | 2020-01-14 | 南京南瑞继保电气有限公司 | Single-phase voltage sag detection method and device, voltage restorer, equipment and medium |
| CN110749769A (en) * | 2019-11-20 | 2020-02-04 | 山东泰开自动化有限公司 | Rapid detection method for three-phase voltage drop |
| CN111049507A (en) * | 2019-12-31 | 2020-04-21 | 广东电科院能源技术有限责任公司 | Method and device for turning off thyristor |
| CN111404190A (en) * | 2020-04-19 | 2020-07-10 | 中国电建集团华东勘测设计研究院有限公司 | Control method and system for enhancing power output capability of MMC converter station under power grid fault |
| CN114784747A (en) * | 2022-06-17 | 2022-07-22 | 成都特隆美储能技术有限公司 | Method for simulating asymmetric voltage drop in energy storage converter test |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244167A (en) * | 2019-07-11 | 2019-09-17 | 西南交通大学 | The detection method of three-phase inverter short trouble |
| CN110244167B (en) * | 2019-07-11 | 2020-09-08 | 西南交通大学 | Method for detecting short-circuit fault of three-phase inverter |
| CN110687344A (en) * | 2019-10-24 | 2020-01-14 | 南京南瑞继保电气有限公司 | Single-phase voltage sag detection method and device, voltage restorer, equipment and medium |
| CN110749769A (en) * | 2019-11-20 | 2020-02-04 | 山东泰开自动化有限公司 | Rapid detection method for three-phase voltage drop |
| CN111049507A (en) * | 2019-12-31 | 2020-04-21 | 广东电科院能源技术有限责任公司 | Method and device for turning off thyristor |
| CN111049507B (en) * | 2019-12-31 | 2023-07-21 | 南方电网电力科技股份有限公司 | Method and device for turning off thyristor |
| CN111404190A (en) * | 2020-04-19 | 2020-07-10 | 中国电建集团华东勘测设计研究院有限公司 | Control method and system for enhancing power output capability of MMC converter station under power grid fault |
| CN111404190B (en) * | 2020-04-19 | 2021-09-03 | 中国电建集团华东勘测设计研究院有限公司 | Control method and system for enhancing power output capability of MMC converter station under power grid fault |
| CN114784747A (en) * | 2022-06-17 | 2022-07-22 | 成都特隆美储能技术有限公司 | Method for simulating asymmetric voltage drop in energy storage converter test |
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Effective date of registration: 20190710 Address after: 518000 electric power dispatching and communication building, 4020 Shennan East Road, Luohu District, Shenzhen, Guangdong Applicant after: SHENZHEN POWER SUPPLY BUREAU Co.,Ltd. Address before: 518000 Electric Power Dispatching and Communication Building 4020 Shennan East Road, Luohu District, Shenzhen City, Guangdong Province Applicant before: SHENZHEN POWER SUPPLY BUREAU Co.,Ltd. Applicant before: South China University of Technology |
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Application publication date: 20181026 |