CN106230008A - A kind of dynamic electric voltage recovery device optimum organization compensation method and system - Google Patents
A kind of dynamic electric voltage recovery device optimum organization compensation method and system Download PDFInfo
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- CN106230008A CN106230008A CN201610641353.9A CN201610641353A CN106230008A CN 106230008 A CN106230008 A CN 106230008A CN 201610641353 A CN201610641353 A CN 201610641353A CN 106230008 A CN106230008 A CN 106230008A
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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Abstract
The invention discloses a kind of dynamic electric voltage recovery device optimum organization compensation method, the advantage that this optimum organization compensation policy combines same-phase compensation method and complete compensation method, when Voltage Drop initial time uses complete compensation method, proof load voltage waveform non-transient distorts, the most gradually transition is same-phase compensation method, reduces dynamic electric voltage recovery device injecting voltage amplitude, it is achieved that seamlessly transit between two kinds of compensation policies, improve the utilization rate of DC capacitor energy storage, extend and fall the compensation time.The invention also discloses a kind of dynamic electric voltage recovery device optimum organization and compensate system.Use the present invention Optimization Compensation strategy the most effective and feasible in the case of equilibrium and non-equilibrium Voltage Drop, both can realize load side voltage in the case of short time Voltage Drop undistorted, again can when long-time Voltage Drop situation proof load voltage distortion the least.
Description
Technical field
The present invention relates to transient power quality and compensate field, particularly a kind of dynamic electric voltage recovery device optimum organization compensation side
Method and system.
Background technology
In electric power system, Voltage Drop is the important safety hidden danger in commercial production.Dynamic electric voltage recovery device can be effective
Compensate Voltage Drop, it is ensured that the various continuous productions fallen under situation.
The Voltage Drop compensation policy that dynamic electric voltage recovery device is conventional includes complete compensation method, same-phase compensation method, minimum energy
Mensuration.Voltage after complete compensation method makes compensation is completely recovered to the voltage before falling generation, its advantage be can guarantee that and fall before
The seriality of back loading voltage, but the shortcoming of the method be DVR output voltage phasor and power uncontrolled；Same-phase compensation method will
The amplitude compensation of system drop-off voltage to rated voltage, and phase place with fall after voltage consistent, its advantage is to compensate voltage amplitude
Value is minimum and calculates simple, and shortcoming is that output is uncontrolled, and the load voltage after compensating has phase angle shift；Minimum
Energy method, is that the load voltage amplitude after making compensation reaches rated value, and its advantage is that DVR output energy is minimum, and shortcoming is load
Voltage also has phase angle shift, calculates complexity.
Summary of the invention
The technical problem to be solved is to overcome the deficiencies in the prior art to provide a kind of dynamic electric voltage recovery device
Optimum organization compensation method and system, the present invention improves the utilization rate of DC capacitor energy storage, extends and falls the compensation time.
The present invention solves above-mentioned technical problem by the following technical solutions:
A kind of dynamic electric voltage recovery device optimum organization compensation method proposed according to the present invention, comprises the following steps:
Step one: fall the moment at grid side voltage, uses complete compensation method to calculate dynamic electric voltage recovery device DVR
The voltage magnitude injected in electrical network and phase place, simultaneously phase lock loop locks grid side voltage-phase storing, now U1=Ug
=U1', load side voltage waveform does not distort, and DC energy storage electric capacity starts electric discharge during this period；Wherein, UgFor the electricity before falling
Voltage on line side, U1For the load voltage before falling, U1' for fall the load voltage in compensation process；
Step 2: after DC bus-bar voltage is less than setting value, dynamic electric voltage recovery device DVR is to grid side injecting compensating electricity
Pressure Udvr' phase place, phaselocked loop locks load voltage phase place immediately simultaneously, makes injecting compensating voltage Udvr' amplitude constantly reduces；Its
In, Udvr' for the DVR injecting voltage amplitude in Voltage Drop compensation process；
Step 3: by phaselocked loop, load voltage smoothing pseudorange is transitted to grid side voltage-phase, reduce note further
Enter voltage Udvr' amplitude；
Step 4: use same-phase compensation method to make the complete phase of phase place of DVR output voltage, grid side voltage and load voltage
With, then injecting voltage Udvr' amplitude minimizes, now Udvr'+Ug'=U1'；Wherein, Ug' it is the grid side voltage after falling.
As a kind of dynamic electric voltage recovery device further prioritization scheme of optimum organization compensation method of the present invention, phase-locked
Ring carries out real-time tracking to load voltage phase place, it is ensured that smoothing pseudorange transition.
System based on above-mentioned a kind of dynamic electric voltage recovery device optimum organization compensation method, detects mould including synchronizing voltage
Block, Voltage Drop detection module, injecting voltage computing module and pwm pulse generation module；Wherein,
Synchronizing voltage detection module, is used for detecting grid side and load side voltage phase place, carries out voltage signal simultaneously
Abc-dq coordinate transform；
Voltage Drop detection module, is used for detecting grid side voltage magnitude and phase place and compared with reference value, determines DVR
Whether input compensation；
Injecting voltage computing module, is used for calculating DVR and initially injects phase angle, transition stage phase place and final phase angle, it is ensured that
Smooth conversion；
Pwm pulse generation module, for driving the switch output signal of power device of inverter.
The system side of optimization further as a kind of dynamic electric voltage recovery device optimum organization compensation method of the present invention
Case, described injecting voltage computing module includes unit and same-phase compensation unit are fully compensated；Wherein,
Unit is fully compensated, for when generating error signal, uses complete compensation method to calculate dynamic electric voltage recovery device and inject
Voltage magnitude and phase place, simultaneously phase lock loop locks grid side voltage-phase storing；
Same-phase compensation unit, for when DC bus-bar voltage is less than setting value, starting to perform same-phase compensation method, phaselocked loop
Be unlocked and with grid side voltage synchronous, and control and compensation voltage and grid side voltage in phase.
The system side of optimization further as a kind of dynamic electric voltage recovery device optimum organization compensation method of the present invention
Case, pwm pulse generation module is according to the U injecteda_refSignal, Ub_refSignal, Uc_refSignal and form pulse-modulated signal,
Controlled the switched voltage output of power device of inverter by H bridge inverter unit, after through LC wave filter Eliminate highter harmonic, complete
Compensation to voltage；Wherein, Ua_refFor dynamic electric voltage recovery device A phase injecting voltage, Ub_refNote for dynamic electric voltage recovery device B phase
Enter voltage, Uc_refFor dynamic electric voltage recovery device C phase injecting voltage.
The present invention uses above technical scheme compared with prior art, has following technical effect that
(1) present invention passes through complete compensation method and the slow transition of same-phase compensation method, gradually realizes phase place and approaches, and reduces and mends
Repay voltage magnitude, in the case of proof load wave distortion is minimum, extends the compensation time；
(2) present invention inhibits load voltage distortion when falling, reduce dynamic electric voltage recovery device injecting voltage amplitude, prolong
Grow and fallen the compensation time, improve the utilization rate of DC capacitor energy storage.
Accompanying drawing explanation
Fig. 1 is dynamic electric voltage recovery device Optimization Compensation strategy phasor schematic diagram of the present invention；Wherein, (a) is that dynamic electric voltage is mended
Repaying the first stage of process, this stage uses complete compensation method；B () is the second stage of dynamic voltage compensation process, this stage
Mainly start compensation voltage-phase to seamlessly transit；C () is the phase III of dynamic voltage compensation process, this stage makes load
Voltage-phase is smoothly transitted into grid side voltage-phase；D () is the fourth stage of dynamic voltage compensation process, this stage uses same
Phase domain compensation.
Fig. 2 be dynamic electric voltage recovery device Optimization Compensation strategy of the present invention realize theory diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawings technical scheme is described in further detail:
As it is shown in figure 1, a kind of dynamic electric voltage recovery device optimum organization compensation policy phasor schematic diagram, (a) in Fig. 1 is
The first stage of state voltage compensation procedure, this stage uses complete compensation method；(b) in Fig. 1 is dynamic voltage compensation process
Second stage, the mainly startup of this stage compensates voltage-phase and seamlessly transits；(c) in Fig. 1 is dynamic voltage compensation process
Phase III, this stage makes load voltage smoothing pseudorange be transitioned into grid side voltage-phase；(d) in Fig. 1 is dynamic electric voltage
The fourth stage of compensation process, this stage employing same-phase compensation method.UgFor the grid side voltage before falling, U1For bearing before falling
Carry voltage, Ug' it is the grid side voltage after falling, U1' for fall the load voltage in compensation process, Udvr' compensated for falling
DVR injecting voltage amplitude in journey, I1For the load current before falling, I1' for fall the load current in compensation process,For
Power-factor angle, δ is phase hit.It is characterized in that, described dynamic electric voltage recovery device compensation policy is from being fully compensated to homophase
Penalty method needs four steps altogether, wherein:
Step one: fall the moment at grid side voltage, uses complete compensation method to calculate dynamic electric voltage recovery device DVR
The voltage magnitude injected in electrical network and phase place, simultaneously phase lock loop locks grid side voltage-phase storing, now U1=Ug
=U1', load side voltage waveform does not distort, and DC energy storage electric capacity starts electric discharge during this period；Wherein, UgFor the electricity before falling
Voltage on line side, U1For the load voltage before falling, U1' for fall the load voltage in compensation process；
Step 2, when DC bus-bar voltage is less than after setting value, and dynamic electric voltage recovery device DVR is to grid side injecting compensating electricity
Pressure Udvr' phase place, phaselocked loop locks load voltage phase place immediately simultaneously, makes injecting compensating voltage Udvr' amplitude constantly reduces；Its
In, Udvr' for the DVR injecting voltage amplitude in Voltage Drop compensation process；
Step 3, by phaselocked loop, load voltage phase place is slowly seamlessly transitted to grid side voltage-phase, subtract further
Little injecting voltage Udvr' amplitude；
Step 4, employing same-phase compensation method make the complete phase of phase place of DVR output voltage, grid side voltage and load voltage
With, then injecting voltage Udvr' amplitude minimizes, now Udvr'+Ug'=U1'。
Described phaselocked loop locks falling moment grid side voltage-phase and stores, at transition stage, phaselocked loop pair
Load voltage phase place carries out real-time tracking, it is ensured that smoothing pseudorange transition.
As in figure 2 it is shown, described dynamic electric voltage recovery device Optimization Compensation strategy realize block diagram include synchronizing voltage detection module,
Voltage Drop detection module, injecting voltage computing module, pwm pulse generation module, wherein UdvrInject for dynamic electric voltage recovery device
Voltage, θ is grid side voltage-phase, and θ ' is load voltage phase place, Ud_refFor reference voltage d axle component, Uq_refFor reference voltage
Q axle component, Ud_gFor grid side voltage d axle component, Uq_gFor grid side voltage q axle component, Udc_refFor dc bus average voltage
Reference value, Udc_meanFor dc bus average voltage, Ua_refFor dynamic electric voltage recovery device A phase injecting voltage, Ub_refFor dynamic electric
Voltage recovery device B phase injecting voltage, Uc_refFor dynamic electric voltage recovery device C phase injecting voltage, Us(dvr_max)For dynamic electric voltage recovery device
Maximum voltage, Q1For load reactive power, P1For load active power, α is to calculate amplitude and the output phase place of phase place.Wherein:
Described synchronizing voltage detection module is used for detecting grid side and load side voltage phase place, carries out voltage signal simultaneously
Abc-dq coordinate transform；
Described Voltage Drop detection module predominantly detects grid side voltage magnitude and phase place and compared with reference value characteristic quantity
Relatively, DVR whether input compensation is determined；
Described injecting voltage computing module is used for calculating DVR and initially injects phase angle, transition stage phase place and final phase angle, really
Keeping tie trackslips changes；
Described pwm pulse generation module is for driving the switch output signal of power device of inverter.
Dynamic electric voltage recovery device optimum organization compensation policy realizes principle: when there is Voltage Drop, and synchronizing voltage detects
Module, Voltage Drop detection module detect grid side voltage magnitude, and phaselocked loop detects and falls moment phase place, then that it is special
The amount of levying compares with reference value, to determine dynamic electric voltage recovery device whether input compensation.When generating error signal, initially with
Complete compensation method calculates dynamic electric voltage recovery device injecting voltage amplitude and phase place, when DC bus-bar voltage is less than setting value, opens
Begin to perform same-phase compensation method, phaselocked loop be unlocked and with grid side voltage synchronous, and control and compensation voltage and grid side voltage with
Phase place.Injection Signal (Ua_ref, Ub_ref, Uc_ref) input pwm pulse generation module formation pulse-modulated signal, by H bridge inversion list
Unit controls the switched voltage output of power device of inverter, after through LC wave filter Eliminate highter harmonic, complete the benefit to voltage
Repay.
Content described in this specification embodiment is only enumerating of the way of realization to inventive concept, the protection of the present invention
Being not construed as of scope is only limitted to the concrete form that embodiment is stated, protection scope of the present invention is also and in this area skill
Art personnel are according to the thinkable equivalent technologies means of present inventive concept.
Claims (5)
1. a dynamic electric voltage recovery device optimum organization compensation method, it is characterised in that comprise the following steps:
Step one: fall the moment at grid side voltage, uses complete compensation method to calculate dynamic electric voltage recovery device DVR to electricity
The voltage magnitude injected in net and phase place, simultaneously phase lock loop locks grid side voltage-phase storing, now U1=Ug=
U1', load side voltage waveform does not distort, and DC energy storage electric capacity starts electric discharge during this period；Wherein, UgFor the electrical network before falling
Side voltage, U1For the load voltage before falling, U1' for fall the load voltage in compensation process；
Step 2: after DC bus-bar voltage is less than setting value, dynamic electric voltage recovery device DVR is to grid side injecting compensating voltage
Udvr' phase place, phaselocked loop locks load voltage phase place immediately simultaneously, makes injecting compensating voltage Udvr' amplitude constantly reduces；Wherein,
Udvr' for the DVR injecting voltage amplitude in Voltage Drop compensation process；
Step 3: load voltage smoothing pseudorange is transitted to grid side voltage-phase by phaselocked loop, reduces further and injects electricity
Pressure Udvr' amplitude；
Step 4: use same-phase compensation method to make DVR output voltage, grid side voltage identical with the phase place of load voltage,
Then injecting voltage Udvr' amplitude minimizes, now Udvr'+Ug'=U1'；Wherein, Ug' it is the grid side voltage after falling.
A kind of dynamic electric voltage recovery device optimum organization compensation method the most according to claim 1, it is characterised in that phaselocked loop
Load voltage phase place is carried out real-time tracking, it is ensured that smoothing pseudorange transition.
3. system based on a kind of dynamic electric voltage recovery device optimum organization compensation method described in claim 1, it is characterised in that
Including synchronizing voltage detection module, Voltage Drop detection module, injecting voltage computing module and pwm pulse generation module；Wherein,
Synchronizing voltage detection module, is used for detecting grid side and load side voltage phase place, voltage signal is carried out abc-dq simultaneously
Coordinate transform；
Voltage Drop detection module, is used for detecting grid side voltage magnitude and phase place and compared with reference value, whether determines DVR
Input compensation；
Injecting voltage computing module, is used for calculating DVR and initially injects phase angle, transition stage phase place and final phase angle, it is ensured that be smooth
Conversion；
Pwm pulse generation module, for driving the switch output signal of power device of inverter.
The system of a kind of dynamic electric voltage recovery device optimum organization compensation method the most according to claim 3, it is characterised in that
Described injecting voltage computing module includes unit and same-phase compensation unit are fully compensated；Wherein,
Unit is fully compensated, for when generating error signal, uses complete compensation method to calculate dynamic electric voltage recovery device injecting voltage
Amplitude and phase place, simultaneously phase lock loop locks grid side voltage-phase storing；
Same-phase compensation unit, for when DC bus-bar voltage is less than setting value, starting to perform same-phase compensation method, phaselocked loop is solved
Lock and with grid side voltage synchronous, and control and compensation voltage and grid side voltage in phase.
The system of a kind of dynamic electric voltage recovery device optimum organization compensation method the most according to claim 3, it is characterised in that
Pwm pulse generation module is according to the U injecteda_refSignal, Ub_refSignal, Uc_refSignal and form pulse-modulated signal, by H
Bridge inversion unit controls the switched voltage output of power device of inverter, after through LC wave filter Eliminate highter harmonic, it is right to complete
The compensation of voltage；Wherein, Ua_refFor dynamic electric voltage recovery device A phase injecting voltage, Ub_refInject for dynamic electric voltage recovery device B phase
Voltage, Uc_refFor dynamic electric voltage recovery device C phase injecting voltage.
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| CN109921429A (en) * | 2019-04-15 | 2019-06-21 | 南京工程学院 | The quick pressure of ship loads stable-pressure device control method |
| CN113872218A (en) * | 2021-10-10 | 2021-12-31 | 费籁电气(上海)有限公司 | Method for analyzing running characteristic of series capacitance coupling type dynamic voltage restorer |
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Cited By (5)
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| CN108199378A (en) * | 2017-12-30 | 2018-06-22 | 国网天津市电力公司电力科学研究院 | A kind of dynamic electric voltage recovery device compensating control method |
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| CN109921429A (en) * | 2019-04-15 | 2019-06-21 | 南京工程学院 | The quick pressure of ship loads stable-pressure device control method |
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Application publication date: 20161214 |