CN108964066A - The Voltage Drop and harmonic wave synchroballistic method of DVR system - Google Patents
The Voltage Drop and harmonic wave synchroballistic method of DVR system Download PDFInfo
- Publication number
- CN108964066A CN108964066A CN201810849210.6A CN201810849210A CN108964066A CN 108964066 A CN108964066 A CN 108964066A CN 201810849210 A CN201810849210 A CN 201810849210A CN 108964066 A CN108964066 A CN 108964066A
- Authority
- CN
- China
- Prior art keywords
- voltage
- phase
- harmonic
- harmonic wave
- component
- 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.)
- Pending
Links
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of Voltage Drops of DVR system and harmonic wave synchroballistic method, by the modification of detection algorithm and the adjustment of control strategy so that DVR (dynamic electric voltage recovery device) has the dual capability for administering harmonic wave and Voltage Drop.Voltage Drop and harmonic detecting method based on instantaneous reactive power theory are used on detection algorithm, realize that single-phase voltage detects by way of being delayed 60 ° of construction two-phase voltages；Control aspect uses hybrid control strategy, will fall reference quantity and harmonic wave reference quantity merges, to generate the function that pwm pulse signal realizes DVR harmonic detecting and improvement.On the basis of meeting Voltage Drop compensation, harmonic signal can be acquired accurately, so that providing good parameter basis for compensation.It can not only realize that Voltage Drop compensates during Voltage Drop and harmonic wave synchroballistic, while harmonic wave is significantly inhibited, so that the quality of load voltage has further promotion.
Description
Technical field
The present invention relates to electric energy quality monitoring and administer field, and in particular to a kind of Voltage Drop and harmonic wave of DVR system
Synchroballistic method.
Background technique
In modern power systems, power load is constantly changed from traditional to based on power electronic technique type.Various impacts
Property, non-linear, fluctuation and asymmetric load largely use, and a series of power quality problems are caused, such as Voltage Drop, voltage wave
It moves and waits.
DVR (dynamic electric voltage recovery device) is current most economical most effective Voltage Drop compensation device.Traditional DVR conduct
A kind of great representative series compensation equipment, can effectively change the Energy distribution of route, carry out to load terminal voltage effective
Adjustment.But its number occurred is limited, and the DVR most of the time is in bypass state, so that its utilization efficiency is not high.Simultaneously
The investment of its bypass circuit is big, controls that the technical difficulty that it is converted to off-state by closed state is also big, this affects whole dress
The operational reliability set.In addition, conventional method does not account for the harmonic wave that generates when system work, such as DVR system sensitive loads and
The harmonic wave of harmonic wave, the generation of practical power systems nonlinear load that rectifier bridge generates, the addition of these harmonic contents can set load
It is standby to generate severe jamming.
Summary of the invention
The purpose of the present invention is to provide a kind of Voltage Drops of DVR system and harmonic wave synchroballistic method.
The technical solution for realizing the aim of the invention is as follows: a kind of Voltage Drop of DVR system and harmonic wave synchroballistic side
Method includes the following steps:
Step 1 carries out PARK transformation to power grid three-phase voltage, obtains the component of voltage under dq coordinate system；
Step 2 carries out low-pass filter to amount after the component of voltage under dq coordinate system, extracts voltage positive sequence fundametal compoment；
Step 3, voltage positive sequence fundametal compoment carry out dq inverse transformation, obtain voltage fundamental sinusoidal quantity, utilize phaselocked loop (PLL)
Technical construction Voltage Drop amplitude and phase；
Step 4 carries out α β variation to power grid three-phase voltage, obtains the component of voltage under α β coordinate system；
Step 5 converts to obtain d, q axis component to the component of voltage progress α β-dq under α β coordinate system, carries out after low-pass filtering
Dq- α β transformation, obtains harmonic voltage fundamental wave amount；
Step 6 makees fundamental wave amount and system voltage poor, harmonic voltage amount is obtained, as the reference voltage for inputting inverter；
Step 7 falls offset voltage and harmonic wave offset voltage according to reference voltage and drop-off voltage phase formation；
Step 8 will fall offset voltage and harmonic compensation voltage superposition, be controlled by feedforward control plus Dual-loop feedback control
Mixing control method generates thermal compensation signal, and control inverter power switch compensates.
Compared with prior art, the present invention its remarkable advantage are as follows: the present invention passes through under the premise of not increasing hardware device
Increase harmonic detecting link in existing detection algorithm, provides the harmonic voltage amount reversed with route medium value for inverter to have
Limiting circuitry harmonic wave is imitated, not only realizes Voltage Drop compensation, while further improving the quality of load voltage.
Detailed description of the invention
Fig. 1 is three-phase four-wire system DVR topological system structural schematic diagram of the invention.
Fig. 2 is single-phase harmonic voltage detection circuit figure of the invention.
Fig. 3 is single-phase harmonic voltage detection circuit figure of the invention.
Fig. 4 is Voltage Drop of the invention and harmonic compensation principle figure.
Fig. 5 falls for single-phase voltage of the invention and harmonic compensation waveform diagram.
Fig. 6 falls for three-phase voltage of the invention and harmonic compensation waveform diagram.
Fig. 7 is Voltage Drop of the invention and harmonic wave synchroballistic method flow diagram.
Specific embodiment
Three-phase four-wire system DVR topological system structure is as shown in Figure 1, its topological structure is made of three single-phase bridges of low pressure.Three
The Voltage Drop and harmonic wave synchroballistic method of phase four-wire system DVR system, comprising the following steps:
Step 1: the instantaneous value of real-time sampling power grid three-phase voltage and three-phase current.Based on improved instantaneous reactive power
Theoretical detection method；PARK transformation is carried out to the three-phase electricity under abc coordinate system, the three-phase electricity under abc coordinate system is converted into
Respective component under dq coordinate system, it may be assumed that
Enable the instantaneous value of asymmetrical three-phase voltage are as follows:
Wherein transformation matrix C are as follows:
Step 2: extracting voltage positive sequence fundamental wave by the way that low-pass filter is added based on the dq transformation that step 1 uses
Component Ud0And Uq0。
Assuming that the fundamental wave virtual value of A phase voltage is U in three-phase system1, initial phase isNth harmonic virtual value is Un, just
Phase angle isThen have:
Above formula is coordinately transformed, then low-pass filtered device is to UdAnd UqComponent, which is filtered, is obtaining voltage just
Sequence fundametal compoment Ud0And Uq0, wherein
Step 3: the voltage positive sequence fundametal compoment U that step 2 is extractedd0And Uq0Voltage fundamental is obtained by dq inverse transformation
Sinusoidal quantity is carried out the detection of Voltage Drop amplitude and phase angle using the method for single-phase delay construction two-phase voltage, obtains falling electricity
The virtual value U of pressure1' and phase
By handling DC component, the virtual value and phase information of drop-off voltage can be obtained are as follows:
Step 4: the variable u that will be obtained after three-phase voltage α β variation under two-phase orthogonal coordinate systemα、uβ, to uα、uβCarry out α β-
Dq converts to obtain d, q axis component Ud、Uq, in conjunction with the phase information of step 3 offerD axis fundamental wave is obtained by low-pass filter
Component, then the inverse transformation result obtained by dq- α β is harmonic voltage fundamental wave amount Uαf。
The single-phase harmonic voltage detection circuit figure applied referring to fig. 2 for the present invention.Assuming that network voltage angular frequency is ω, A
Phase voltage initial phase angle isNetwork voltage virtual value is E, then instantaneous voltage can state are as follows:
Instantaneous voltage is transformed in α β two-phase orthogonal coordinate system, available expression formula:
Wherein C32For the transformation matrix of coordinate transform.
Wherein transformation matrix C are as follows:
By acquired d axis fundametal compoment U 'dHarmonic voltage fundamental wave amount can be obtained by carrying out dq- α β inverse transformation:
Uαf=C32 -1U‘d
Step 5: the fundamental wave amount that step 4 is obtained is poor by subtracter and system voltage work, harmonic voltage amount is obtained, is made
For the reference voltage for inputting inverter.By taking A phase as an example, by fundamental wave amount UαfPass through subtracter and system A phase voltage UaIt is poor to make, and obtains
Corresponding harmonic voltage amount Uah。
Step 6: the reference voltage obtained using step 5, the drop-off voltage phase formation obtained by step 3 goes out to compensate
Voltage UDVR, and the harmonic voltage extracted is subjected to equivalent reverse process as harmonic compensation voltage Ush, it is this hair referring to Fig. 3
The harmonic voltage detection circuit figure of bright application.
Step 7: offset voltage U will be fallenDVRWith harmonic compensation voltage UshSuperposition, passes through feedforward control plus Dual-loop feedback control
The mixing control method and PWM generator of control generate thermal compensation signal, and control inverter power switch compensates, referring to fig. 4
For the Voltage Drop and harmonic compensation principle figure of application of the invention.
Embodiment
It in order to verify the validity of the method for the present invention, is emulated using simulation software MATLAB/Simulink, emulation is real
The major parameter for testing middle DVR simulation model is that power supply is 220V three phase mains, and capacity 60kVA, switching frequency 10kHz are born
It carries and selects simple RL resistance sense load, wherein R=2.3 Ω, L=0.5e-3H；Using electric resistance partial pressure plus by-pass switch switching mode
Analog voltage falls, and the failure of falling of the voltage containing harmonic, sampling interval duration 5e-5s is arranged, and verifying voltage falls inspection
It surveys and the accuracy and rapidity of harmonic detecting, DVR system can synchronize the function of carrying out voltage compensation and harmonic compensation.
When emulation, also contain in system voltage other than fundamental wave to verify harmonic wave and Voltage Drop synchroballistic effect
There are 3,5,7 subharmonic, in order to which verifying voltage falls the accuracy of detection and harmonic detecting, setting voltage containing harmonic falls
Failure；Simulation time is set as 0.5s, falls time of origin between 0.1s-0.4s, and with 30 ° of phase hits, emulation point
Fall two groups with three-phase for single-phase fall.
Fig. 5-6 is that single-phase voltage of the invention falls and harmonic compensation waveform diagram and three-phase voltage falls and harmonic compensation wave
Shape figure, VasFor system voltage waveform, VdFor the offset voltage waveform obtained after DVR detection system voltage, VaLTo load voltage wave
Shape.It can be seen that load voltage is hardly influenced by harmonic wave and Voltage Drop.
It is analyzed from the above experiment simulation, the method for the present invention is on the basis of meeting Voltage Drop compensation, harmonic signal energy
Enough accurate acquisitions, provide good parameter basis for compensation；It can not only during Voltage Drop and harmonic wave synchroballistic
It realizes Voltage Drop compensation, while harmonic wave is significantly inhibited, further mentioned so that the quality of load voltage has
It rises.
Claims (7)
1. the Voltage Drop and harmonic wave synchroballistic method of a kind of DVR system, which comprises the steps of:
Step 1 carries out PARK transformation to power grid three-phase voltage, obtains the component of voltage under dq coordinate system；
Step 2 carries out low-pass filter to amount after the component of voltage under dq coordinate system, extracts voltage positive sequence fundametal compoment；
Step 3, voltage positive sequence fundametal compoment carry out dq inverse transformation, obtain voltage fundamental sinusoidal quantity, are constructed using PHASE-LOCKED LOOP PLL TECHNIQUE
Voltage Drop amplitude and phase；
Step 4 carries out α β variation to power grid three-phase voltage, obtains the component of voltage under α β coordinate system；
Step 5 converts to obtain d, q axis component to the component of voltage progress α β-dq under α β coordinate system, carries out dq- α after low-pass filtering
β transformation, obtains harmonic voltage fundamental wave amount；
Step 6 makees fundamental wave amount and system voltage poor, harmonic voltage amount is obtained, as the reference voltage for inputting inverter；
Step 7 falls offset voltage and harmonic wave offset voltage according to reference voltage and drop-off voltage phase formation；
Step 8 will fall offset voltage and harmonic compensation voltage superposition, the mixing controlled by feedforward control plus Dual-loop feedback control
Control method generates thermal compensation signal, and control inverter power switch compensates.
2. the Voltage Drop and harmonic wave synchroballistic method of DVR system according to claim 1, which is characterized in that step 1
The method for carrying out PARK transformation are as follows:
Wherein, Ud、UqIndicate the component of voltage under dq coordinate system, Ua、Ub、UcIndicate the three-phase voltage under abc coordinate system；
Transformation matrix C are as follows:
3. the Voltage Drop and harmonic wave synchroballistic method of DVR system according to claim 1, which is characterized in that step 2
Extract voltage positive sequence fundametal compoment method particularly includes:
If the fundamental wave virtual value of A phase voltage is U in three-phase system1, initial phase isNth harmonic virtual value is Un, initial phase angle isThe then three-phase voltage U under abc coordinate systema、Ub、UcIt indicates are as follows:
Low-pass filtered device is to UdAnd UqComponent, which is filtered, obtains DC component Ud0And Uq0, indicate are as follows:
4. the Voltage Drop and harmonic wave synchroballistic method of DVR system according to claim 1, which is characterized in that step 3
Obtained Voltage Drop amplitude and phase is expressed as:
In formula, U1'、Indicate Voltage Drop amplitude and phase, Ud0、Uq0Indicate DC component.
5. the Voltage Drop and harmonic wave synchroballistic method of DVR system according to claim 1, which is characterized in that step 4
The method for carrying out α β variation are as follows:
If network voltage angular frequency is ω, A phase voltage initial phase angle isNetwork voltage virtual value is E, then three under abc coordinate system
Phase voltage Ua、Ub、UcIt indicates are as follows:
Instantaneous voltage is transformed in α β two-phase orthogonal coordinate system, then the component of voltage U under α β coordinate systemα、UβIt indicates are as follows:
In formula, C32For the transformation matrix of α β transformation.
6. the Voltage Drop and harmonic wave synchroballistic method of DVR system according to claim 1, which is characterized in that step 5
The method for determining harmonic voltage fundamental wave amount are as follows:
If the component of voltage U under α β coordinate systemα、Uβ, carry out α β-dq and convert to obtain d, q axis component u 'd、u′qIt respectively indicates are as follows:
Wherein transformation matrix C are as follows:
In formula, network voltage angular frequency is ω；
By acquired d axis fundametal compoment U 'dHarmonic voltage fundamental wave amount U can be obtained by carrying out dq- α β inverse transformationαhIt indicates are as follows:
Uαf=C32 -1U‘d
In formula, C32For the transformation matrix of α β transformation.
7. the Voltage Drop and harmonic wave synchroballistic method of DVR system according to claim 1, which is characterized in that step 7
Fall offset voltage using drop-off voltage phase and reference voltage construction, harmonic voltage is subjected to equivalent reverse process as harmonic wave
Offset voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810849210.6A CN108964066A (en) | 2018-07-28 | 2018-07-28 | The Voltage Drop and harmonic wave synchroballistic method of DVR system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810849210.6A CN108964066A (en) | 2018-07-28 | 2018-07-28 | The Voltage Drop and harmonic wave synchroballistic method of DVR system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108964066A true CN108964066A (en) | 2018-12-07 |
Family
ID=64465998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810849210.6A Pending CN108964066A (en) | 2018-07-28 | 2018-07-28 | The Voltage Drop and harmonic wave synchroballistic method of DVR system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108964066A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011316A (en) * | 2019-03-15 | 2019-07-12 | 南京工程学院 | Energy control method based on the double P-Q theories of instantaneous space vector sum |
| CN110361629A (en) * | 2019-07-12 | 2019-10-22 | 安徽工程大学 | A kind of voltage dip detection system based on dynamic electric voltage recovery device |
| CN113964843A (en) * | 2021-11-26 | 2022-01-21 | 国网江苏省电力有限公司扬州市江都区供电分公司 | Dynamic voltage compensation control method based on neural network |
| CN115276029A (en) * | 2020-04-22 | 2022-11-01 | 国网浙江省电力有限公司绍兴供电公司 | UPQC (unified Power quality conditioner) topological structure and control method |
| CN118300107A (en) * | 2024-06-05 | 2024-07-05 | 山东华天科技集团股份有限公司 | Parallel voltage filter and control method thereof |
-
2018
- 2018-07-28 CN CN201810849210.6A patent/CN108964066A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011316A (en) * | 2019-03-15 | 2019-07-12 | 南京工程学院 | Energy control method based on the double P-Q theories of instantaneous space vector sum |
| CN110011316B (en) * | 2019-03-15 | 2022-12-16 | 南京工程学院 | Energy control method based on instantaneous space vector and double P-Q theory |
| CN110361629A (en) * | 2019-07-12 | 2019-10-22 | 安徽工程大学 | A kind of voltage dip detection system based on dynamic electric voltage recovery device |
| CN115276029A (en) * | 2020-04-22 | 2022-11-01 | 国网浙江省电力有限公司绍兴供电公司 | UPQC (unified Power quality conditioner) topological structure and control method |
| CN113964843A (en) * | 2021-11-26 | 2022-01-21 | 国网江苏省电力有限公司扬州市江都区供电分公司 | Dynamic voltage compensation control method based on neural network |
| CN113964843B (en) * | 2021-11-26 | 2023-11-10 | 国网江苏省电力有限公司扬州市江都区供电分公司 | Dynamic voltage compensation control method based on neural network |
| CN118300107A (en) * | 2024-06-05 | 2024-07-05 | 山东华天科技集团股份有限公司 | Parallel voltage filter and control method thereof |
| CN118300107B (en) * | 2024-06-05 | 2024-08-27 | 山东华天科技集团股份有限公司 | Parallel voltage filter and control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108964066A (en) | The Voltage Drop and harmonic wave synchroballistic method of DVR system | |
| CN107171584B (en) | The model predictive control method and device of NPC three-phase tri-level gird-connected inverter | |
| CN106532736B (en) | Based on the SVG negative phase-sequence zero sequence current compensation method for improving instantaneous symmetrical components | |
| CN104578168B (en) | Different capabilities micro-source microgrid inverter operational mode takes over seamlessly control method | |
| CN106602895B (en) | Method and system for detecting commutation parameters of high-voltage direct-current transmission converter | |
| Hoke et al. | A power hardware-in-the-loop framework for advanced grid-interactive inverter testing | |
| CN105449718B (en) | The grid-connected genlock method of algorithm is offseted based on the delay of modified series signals | |
| CN103116059B (en) | Voltage fast detection algorithm suitable for grid power system low voltage ride through function | |
| CN105162162A (en) | Phase perturbation based island detection system for distributed gird-connected inverter | |
| CN107947787A (en) | A kind of system self-adaption phase-locked loop method applied to high-power three-level back-to-back PWM converter | |
| CN107632200A (en) | Harmonic detecting method based on discrete Fourier transform | |
| CN108306295A (en) | Adaptive ratio resonance controls Active Power Filter-APF | |
| CN105552955A (en) | Control system and method for low-voltage and zero-voltage ride through of photovoltaic grid-connected inverter | |
| CN103296700A (en) | Interconnection-line-less compensation control method of microgrid harmonic waves and idle currents | |
| CN110011337A (en) | Control method suitable for three-phase imbalance compensation | |
| CN105021872A (en) | Active and passive component detection method for different current components in distorted and asymmetric voltage state of electrical network | |
| CN108627731A (en) | A kind of rapid detection method of single-phase power-off | |
| CN110266008A (en) | Based on the improved more level active power filters of neutral-point-clamped type | |
| Ghosh et al. | Design and simulation of a novel self supported dynamic voltage restorer (DVR) for power quality improvement | |
| CN103117562A (en) | Control method of high-voltage cascade energy feedback converter power module | |
| CN104734537A (en) | Control method for wind power current converter based on positive-and-negative sequence current inner-loop control | |
| CN108599262A (en) | Improvement virtual synchronous machine motor synchronizing under unbalanced power grid is incorporated into the power networks control method | |
| CN107703358A (en) | A kind of phase locked algorithm based on improvement Second Order Generalized Integrator | |
| CN105116794B (en) | It is adapted to the grid simulator control method of Small And Medium Capacity distributed generation resource access | |
| CN111384716B (en) | Seven-level static synchronous compensator based on unbalanced power grid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181207 |
|
| RJ01 | Rejection of invention patent application after publication |