CN110266044A - A kind of micro-grid connection control system and method based on energy accumulation current converter - Google Patents
A kind of micro-grid connection control system and method based on energy accumulation current converter Download PDFInfo
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- H—ELECTRICITY
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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
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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
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- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The present disclosure proposes a kind of micro-grid connection control system and method based on energy accumulation current converter, are quickly detected from electrical network negative phase-sequence electric current, harmonic wave and reactive current first with virtual sin cos functions；Power output control is realized using ratio resonant controller and to micro-grid connection electric current is idle and harmonic wave etc. carries out frequency dividing compensation control by system margin, multi objective control is carried out to energy accumulation current converter；The compensation and balance that micro-grid connection electric current can be achieved, improve the power quality of micro-capacitance sensor.Simultaneously because the design of ratio resonant controller control parameter is complicated, the on-line tuning of ratio resonant parameter is carried out in conjunction with fuzzy algorithmic approach, makes system that there is preferable dynamic property.
Description
Technical field
This disclosure relates to power quality controlling correlative technology field, in particular to a kind of be based on energy accumulation current converter
Micro-grid connection control system and method.
Background technique
The statement of this part only there is provided background technical information relevant to the disclosure, not necessarily constitutes first skill
Art.
Micro-capacitance sensor is a concept of relatively traditional bulk power grid, refers to multiple distributed generation resources and its related load according to one
The network of fixed topological structure composition, is associated with by static switch to normal grid.Exploitation and extension micro-capacitance sensor can sufficiently promote
Into the extensive access of distributed generation resource and renewable energy, the highly reliable supply to load various energy resources form is realized, be real
A kind of effective means of existing active power distribution network, makes traditional power grid to smart grid transition.The it is proposed of micro-capacitance sensor aims at point
Flexible, the efficient application of cloth power supply solve the problems, such as that substantial amounts, various informative distributed generation resource are grid-connected.
Micro-capacitance sensor can solve the electricity needs of dispersion to a certain extent, reduce electric power and create or upgrade defeated, power distribution network
Expense has been increasingly becoming the grid-connected effective means of renewable energy.Currently, the research for being directed to micro-capacitance sensor is concentrated mainly on planning and sets
Meter, running optimizatin, protection control etc..And compared with traditional power grid, micro-capacitance sensor is mainly characterized by such as wind, light equal distribution
The randomness of formula power supply, intermittence and under the influence of situations such as loading non-linear, uneven mutation, harmonic wave in micro-capacitance sensor and
Reactive current not only will affect the safe operation of the distributed power supply system and load of internal access, also will increase line loss.
Its power quality problem also becomes increasingly conspicuous.
Summary of the invention
The disclosure to solve the above-mentioned problems, propose a kind of micro-grid connection control system based on energy accumulation current converter and
Method, the disclosure are quickly detected from electrical network negative phase-sequence electric current, harmonic wave and reactive current first with virtual sin cos functions, with
Afterwards, proportion of utilization resonant controller realizes power output control, and to micro-grid connection electric current is idle and harmonic wave etc. presses system
Surplus carries out frequency dividing compensation control, and the on-line tuning of PR parameter is carried out in conjunction with fuzzy algorithmic approach, system is made to have preferable dynamic
Can, and then improve the power quality under micro-grid connection operating status.
To achieve the goals above, the disclosure adopts the following technical scheme that
One or more embodiments provide a kind of micro-grid connection control method based on energy accumulation current converter, including as follows
Step:
S1, the three-phase voltage and three-phase current for acquiring grid-connected end；
S2, virtual sin cos functions are utilized according to the three-phase voltage and three-phase current numerical value of acquisition, calculates electrical network negative phase-sequence electricity
Stream, harmonic wave and reactive current；
S3, the given value exported according to electrical network negative phase-sequence electric current, harmonic wave and the reactive current and energy accumulation current converter of detection, use
The harmonic compensation current and watt current of frequency division control method control output energy accumulation current converter.
A kind of micro-grid connection control system based on energy accumulation current converter, including micro-capacitance sensor and traditional power grid, micro-capacitance sensor packet
Distributed generation resource, load, energy storage device are included, the energy storage device includes at least energy-storage battery, energy accumulation current converter and energy storage control
Device processed, the energy-storage battery are connect with energy accumulation current converter, and the energy storage controller and energy accumulation current converter are for controlling energy storage unsteady flow
Device realizes that micro-capacitance sensor is incorporated to traditional power grid, and the energy storage controller executes a kind of above-mentioned micro-capacitance sensor based on energy accumulation current converter simultaneously
Network control method.
A kind of electronic equipment, the meter run on a memory and on a processor including memory and processor and storage
The instruction of calculation machine when the computer instruction is run by processor, completes step described in the above method.
A kind of computer readable storage medium, for storing computer instruction, the computer instruction is executed by processor
When, complete step described in the above method.
Disclosure proportion of utilization resonant controller realizes power output control, and to the idle harmony of micro-grid connection electric current
Wave etc. by system margin carry out frequency dividing compensation control, in conjunction with fuzzy algorithmic approach carry out PR parameter on-line tuning, make system have compared with
Good dynamic property, and then improve the power quality under micro-grid connection operating status.
Compared with prior art, the disclosure has the beneficial effect that
The disclosure is quickly detected from electrical network negative phase-sequence electric current, harmonic wave and reactive current first with virtual sin cos functions,
Then, the frequency selective characteristic of proportion of utilization resonant controller, realize power output control and it is idle to micro-grid connection electric current
Frequency dividing compensation control is carried out by system margin with harmonic wave etc., simultaneously because the design of ratio resonant controller control parameter is complicated, knot
The on-line tuning that fuzzy algorithmic approach carries out ratio resonant parameter is closed, makes system that there is preferable dynamic property, and then improve micro- electricity
Power quality under net grid-connected state.
Detailed description of the invention
The Figure of description for constituting a part of this disclosure is used to provide further understanding of the disclosure, and the disclosure is shown
Meaning property embodiment and its explanation do not constitute the restriction to the disclosure for explaining the disclosure.
Fig. 1: 1 grid-connected control method flow chart of the embodiment of the present disclosure；
Fig. 2: 1 micro-capacitance sensor composed structure schematic diagram of the embodiment of the present disclosure；
Fig. 3: the wiring diagram of 1 energy accumulation current converter of the embodiment of the present disclosure；
Fig. 4: the idle detection principle diagram of harmonic wave that the embodiment of the present disclosure 1 is compensated based on phase locked loop error；
Fig. 5: the frequency dividing control schematic diagram of 1 energy accumulation current converter of the embodiment of the present disclosure；
Fig. 6: the on-line tuning schematic diagram of ratio resonant parameter in the frequency dividing control of 1 energy accumulation current converter of the embodiment of the present disclosure；
Fig. 7: the subordinating degree function of 1 Indistinct Input amount e, ec of the embodiment of the present disclosure；
Fig. 8: grid-connected current waveform and frequency analysis before compensation harmonic in 1 simulation analysis of the embodiment of the present disclosure；
Fig. 9: grid-connected current waveform and frequency analysis after compensation harmonic in 1 simulation analysis of the embodiment of the present disclosure；
Figure 10: the active power that PCS is exported in 1 simulation analysis of the embodiment of the present disclosure；
Figure 11: PCS output compensation electric current in 1 simulation analysis of the embodiment of the present disclosure；
Figure 12: PCS compensated setpoint electric current in 1 simulation analysis of the embodiment of the present disclosure；
Figure 13: the voltage and current experimental waveform of grid side before being compensated in 1 simulation analysis of the embodiment of the present disclosure；
Figure 14: the voltage and current experimental waveform of grid side after being compensated in 1 simulation analysis of the embodiment of the present disclosure.
Specific embodiment:
The disclosure is described further with embodiment with reference to the accompanying drawing.
It is noted that described further below be all exemplary, it is intended to provide further instruction to the disclosure.Unless another
It indicates, all technical and scientific terms used herein has usual with disclosure person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the disclosure.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.It should be noted that not conflicting
In the case where, each embodiment in the disclosure and the feature in embodiment can be combined with each other.Below in conjunction with attached drawing to reality
Example is applied to be described in detail.
A kind of micro-grid connection control system based on energy accumulation current converter, as shown in figure 3, including micro-capacitance sensor and tradition electricity
Net, micro-capacitance sensor include distributed generation resource, load, energy storage device, and the energy storage device includes at least energy-storage battery, energy storage unsteady flow
Device and energy storage controller, the energy-storage battery are connect with energy accumulation current converter, and the energy storage controller is with energy accumulation current converter for controlling
Energy accumulation current converter processed realizes that micro-capacitance sensor is incorporated to traditional power grid, and the energy storage controller realizes micro-capacitance sensor by control energy accumulation current converter
Cutting-in control.
It is illustrated in figure 2 micro-capacitance sensor composed structure.Micro-capacitance sensor distributed power source, energy conversion device, is born energy storage device
The small-sized electric system of the compositions such as lotus, monitoring and protective device.The distributed generation resource may include: photo-voltaic power supply, wind
Power generation device etc., if the analog platform as analogue system can be simulated using the wind-power electricity generation of gird-connected inverter interface
Device, photo-voltaic power supply；
The load includes: common load and non-linear, uneven sensibility load；
The energy storage device includes at least energy-storage battery such as ferric phosphate lithium cell energy storage, energy accumulation current converter and energy storage controls
Device.Electric current is compensated in the present embodiment to be generated by energy accumulation current converter (referred to as PCS) by space vector pulse width modulation SVPWM；Storage
Frequency and switching frequency can be set as 10kHz by energy current transformer PCS；It is illustrated in figure 3 the typical wiring of energy accumulation current converter
Figure, by detecting the grid-connected end electric current I of current transformer(a、b、c)With voltage U(a、b、c)And feed back in energy storage controller, to realize to energy storage
The flexible control of current transformer.Energy storage controller can use DSPTMS320F2812 chip；
In the technical solution disclosed in one or more embodiments, as shown in Figure 1, a kind of based on energy accumulation current converter
Micro-grid connection control method, includes the following steps:
S1, three-phase voltage, the three-phase current for acquiring grid-connected end；
S2, virtual sin cos functions are utilized according to three-phase voltage, the three-phase current numerical value of acquisition, calculates electrical network negative phase-sequence electricity
Stream, harmonic wave and reactive current；
S3, the given value exported according to electrical network negative phase-sequence electric current, harmonic wave and the reactive current and energy accumulation current converter of detection, use
The harmonic compensation current and watt current of frequency division control method control output energy accumulation current converter.
The method of the step S2 is specially using the idle detection of harmonic wave compensated based on phase locked loop error: being that will synchronize rotation
Turn reference coordinate transformation, combinatorial operation and low-pass filter (LPF) be introduced into before phaselocked loop so as to overcome three-phase voltage asymmetry,
The interference to distort to fundamental positive sequence voltage is obtained.Specifically comprise the following steps:
Three-phase voltage, three-phase current are synchronized rotary reference coordinate transform by step 21, are sat from three phase static a-b-c
Mark system transforms to the static alpha-beta coordinate system of two-phase, obtains alpha-beta coordinate system voltage and current numerical value；
Step 22, alpha-beta coordinate system voltage are combined operation, eliminate fundamental wave negative sequence component, and pass through LPF for AC compounent
It filters out, obtains fundamental positive sequence DC component, and obtain a phase positive sequence fundamental wave DC voltage ua-1p +；
Step 23, by a phase positive sequence fundamental wave DC voltage ua-1p +By the current values of phase-locked loop pll and alpha-beta coordinate system into
Row harmonic detecting obtains the detected value i of power grid fundamental wave negative sequence component and harmonic waveαh、iβh, that is, contain electrical network negative phase-sequence electric current, harmonic wave
And reactive current.Phaselocked loop is to phase existing for a phase voltage locking phase when to compensate for asymmetric three-phase power grid voltage, distortion
Difference, while also inhibiting interference of the harmonic voltage signal to detection.
It is not only electric containing fundamental positive sequence, negative phase-sequence and zero sequence in a phase voltage in view of three-phase voltage asymmetry, distortion situation
Pressure, further includes harmonic voltage；So that there are phase difference, phaselocked loops (PLL) between a phase positive sequence voltage component and a phase voltage
Also the detection of harmonic and reactive currents can be directly influenced because of certain interference caused by harmonic voltage.If Fig. 4 is based on phaselocked loop
The harmonic wave of error compensation is idle testing principle: detailed process is as follows:
If three-phase power grid voltage is asymmetric and when containing harmonic wave, a-b-c three-phase voltage is transformed into alpha-beta coordinate system, three-phase
Static a-b-c coordinate system may be expressed as: to the transformation of the static alpha-beta coordinate system of two-phase
In formula, Un +、Un -、Formula is respectively the virtual value and initial phase of positive sequence, negative sequence component；ωoXiang Wei
The system frequency of network voltage；N is overtone order；
By uα、uβWith synchronous rotary angle ωoT+ θ is sinusoidal, cosine is multiplied, and can obtain:
Two formulas are combined operation again, fundamental wave negative sequence component is eliminated, and filter out AC compounent by LPF, base can be obtained
Wave positive sequence DC component:
In formula, U1p +、For the virtual value and initial phase of positive sequence DC component.
Further construct a phase positive sequence fundamental wave DC voltage ua-1p +:
By the u of extractiona-1p +Carry out harmonic detecting again by phase-locked loop pll, thus compensate for three-phase power grid voltage it is asymmetric,
PLL is to phase difference existing for a phase voltage locking phase when distortion, while also inhibiting interference of the harmonic voltage signal to detection.
Three-phase current a-b-c is changed into alpha-beta coordinate system, obtains output electric current i of the PCS on α beta -axis componentα、iβ, then pass through
Dq converts to obtain output electric current i under dq axisd、iq, wherein LPF is low-pass filter, for filtering out the high frequency in negative current instructions
Harmonic wave.Influence of the harmonic wave to control can reduce as thermal compensation signal using the current signal after low-pass filtering under dq coordinate system,
It avoids when alternating voltage is multiplied with electric current due to the uncharacteristic harmonics of the inconsistent introducing of phase simultaneously.
Convert to obtain output electric current i under dq axis through dqd、iq, DC component i under dq axis is obtained using LPFd-dc、iq-dc,
By after dq inverse transformation with iα、iβIt makes the difference and compares, negative-sequence current can be obtained.
S3, the given value exported according to electrical network negative phase-sequence electric current, harmonic wave and the reactive current and energy accumulation current converter of detection, use
The harmonic compensation current and watt current of frequency division control method control output energy accumulation current converter.Realize energy accumulation current converter power output
Control and the idle harmonious wavelength-division frequency compensation control of micro-grid connection electric current；
As shown in figure 5, specific step is as follows for frequency division control method:
31, according to grid-connected current detection value iαh、iβhWith current compensation given value iα *、iβ *Obtain energy accumulation current converter output
Electric current Iαβ *And the frequency range of the higher top n of harmonic component content is set as frequency dividing compensation frequency range, compensates in frequency dividing
Frequency dividing control output quantity is obtained using the ratio resonance frequency dividing control mode of complex vector parallel connection ratio control in frequency range；
32, frequency dividing control output quantity and triangular wave are modulated, and generate the trigger pulse of switching device；
33, when energy accumulation current converter receives trigger pulse, energy accumulation current converter exports Iαβ *。
The energy accumulation current converter exports Iαβ *Including may each harmonic component that compensates of needs, fundamental reactive current component,
Fundamental wave zero sequence and negative-sequence current component and grid-connected active current etc..
Comprehensive compensation electric current Iαβ *Generation method: it is equivalent mathematical model of the determining PCS under α β coordinate system, passes through control
Electric current is realized to active power of output Pg, reactive power QgControl, and combine given value Pg=Pg *、Qg=Qg *, find out output electricity
Flow reference value iα *、iβ *, achieve the purpose that compensate that grid-connected current is idle and harmonic wave.
Step 311: setting PCS active power of output Pg, reactive power QgGiven value Pg *And Qg *
Step 312: equivalent mathematical model of the PCS under α β coordinate system is determined in foundation；
Step 313: given value Pg *And Qg *With equivalent mathematical model of the PCS under α β coordinate system, calculates and obtain PCS output
Current reference value iα *、iβ *；
Step 314: according to output current reference value iα *、iβ *Neutralization procedure 23 obtains electrical network negative phase-sequence electric current, harmonic wave and idle
The detected value i of electric currentαh、iβh, obtain compensation electric current Iαβ *, achieve the purpose that compensate that grid-connected current is idle and harmonic wave.
The main circuit diagram of the PCS of the present embodiment can be as shown in figure 3, equivalent mathematical model of the PCS under α β coordinate system can
To indicate are as follows:
In formula, L and R are grid-connected inlet wire inductance and resistance；uα、uβFor the α beta -axis component of network voltage；iα、iβIt is defeated for PCS
The α beta -axis component of electric current out；ucα、ucβFor the α beta -axis component of the side PCS voltage.
The active-power P g and reactive power Q g of PCS output can be respectively indicated are as follows:
By formula (7) it is found that if can control id、iqIt can be realized to output power Pg、QgControl, control PCS output have
Function, it is idle when, zero-sequence current component zero, by given value Pg=Pg *、Qg=Qg *It brings into formula (7), can obtain:
According to formula (7), (8), if micro-grid connection voltage exports current reference value there are harmonic wave and reactive current
iα *、iβ *It is middle will be introduced into detected fundamental wave negative sequence component and each harmonic in corresponding step 23, reach compensation grid-connected current
Idle and harmonic wave purpose.
PCS multiple target frequency dividing control；
Wherein, the PCS multiple target frequency dividing control: current transformer output is that harmonic wave is mended in the multiple target collocation structure of PCS
Repay electric current and watt current.Wherein power unit calculating current iαh、iβhWith compensation given value iα *、iβ *It is combined and selects defeated
I outαβ *, including each harmonic component that may need to compensate, fundamental reactive current component, fundamental wave zero sequence and negative-sequence current component
And grid-connected active current etc..There is adaptive compensation power quality to make full use of PCS residual capacity and realizing, frequency dividing control
System uses complex vector (CPI) control mode, i.e., vector scale integral (VPI) control is passed through formula fαβ=fdqe-jωtCarry out etc.
Effect transformation, is completed from dq rotating coordinate system to the conversion of α β rest frame.Pass through frequency dividing control output quantity UPVPI(s) and triangle
Wave is modulated, that is, can produce the trigger pulse of switching device, by PCS composite control method, injects the comprehensive of power distribution network response
Compensation electric current is closed, achievees the purpose that promotion power quality accurately and quickly.
There is adaptive compensation power quality to make full use of PCS residual capacity and realizing, frequency dividing control uses complex vector
(CPI) vector scale integral (VPI) control is passed through formula f by control modeαβ=fdqe-jωtCarry out equivalent transformation, complete from
For dq rotating coordinate system to the conversion of α β rest frame, specific transformation for mula is as follows:
In formula, τp、τiRespectively proportionality coefficient and integral coefficient, ω0For cutoff frequency, s is complex variable, by VPI with
CPI comparison, it is known that (9) PI controls proportional τ inpWith j ω τpThere are coupled relation between/s, cause to be difficult to realize system
Independent response control, to improve its responding ability, the ratio control item τ in parallel on the basis of CPI controlpo, it is in parallel after expression formula such as
Under:
In formula, τpoIt is ratio control item, τp、τiRespectively proportionality coefficient and integral coefficient, ω0For cutoff frequency.
The expression formula (10) rotated in dq coordinate system is transformed into the static α β coordinate system of two-phase and obtains expression formula (11), such as
Under:
In formula, τpoIt is ratio control item, τp、τiRespectively proportionality coefficient and integral coefficient, ω0For cutoff frequency.
Formula (11) is one of ratio resonant controller, referred to as PVPI, passes through change proportional τ in controlp0
Keep dynamic property separately adjustable, improves the PCS response performance of PVPI control.
Therefore, the calculation formula of frequency dividing control output quantity are as follows:
In formula, τpFor proportionality coefficient, τiFor integral coefficient, ω0For cutoff frequency.
Frequency dividing control output quantity UPVPI(s) it is modulated with triangular wave, that is, can produce the trigger pulse of switching device, pass through
PCS composite control method, the comprehensive compensation electric current of injection power distribution network response, reaches the mesh of promotion power quality accurately and quickly
's.
As shown in fig. 6, the PCS obscures PVPI control method: calculating PCS output voltage, then pass through PWM tune
System, trigger converter control the output of its electric current, achieve the purpose that the grid-connected harmonic current of filtering, compensating reactive power.Pass through fuzzy parameter
Adjuster realizes that the parameter of PVPI controller is adjusted in real time online.The deviation variation rate of the deviation e and its derived function that will acquire
Ec is used as the input of PVPI controller simultaneously, to reach optimal control effect, therewith by fuzzy parameter adjuster, completes
Real-time online adjusting is carried out to PVPI parameter on the basis of PVPI parameter pre-tuning.
Ratio resonance frequency dividing control mode further includes the steps that the on-line tuning of ratio resonant parameter in step S3, specifically
The on-line tuning of ratio resonant parameter is carried out by fuzzy algorithmic approach；
The step of on-line tuning of ratio resonant parameter includes: blurring, fuzzy reasoning, fuzzy solution three parts.It can be with
It is realized by setting fuzzy controller.
The blurring includes: controller to input quantity e, ecFuzzy processing is carried out, wherein PVPI controller can be with
Input, output variable, i.e. { NB, NM, NS, O, PS, PM, PB } are indicated using 7 Linguistic Values, as shown in fig. 7, triangle can be used
Shape degree of membership, can be set fuzzy quantity e, ecDomain [- 6,6].
The fuzzy reasoning includes: the core for choosing PVPI attitude conirol rule as fuzzy reasoning, mainly
Obtained by expertise and field adjustable.
Tuning method is described as follows: the deviation signal e of system is mainly controlled by proportional component, i.e., deviation is once
It is formed, PVPI controller generates adjustment effect immediately to inhibit deviation；If τpiValue is excessive, will cause system oscillation, destroys dynamic
State property energy.Therefore, when deviation is larger, τpiIt is taken large values as far as possible to improve response speed；When deviation is smaller, τpiReduce to press down
The excessive generation oscillation of overshoot processed；When deviation further decreases, τpiIt should continue to reduce so that system restores stable as early as possible.Separately
Outside, it is also desirable to consider deviation variation rate ecWith the relationship of e, work as ecWhen positive and negative consistent with e, output is gradually deviated from stationary value, increases Δ
τpi；Conversely, reducing Δ τpi.Integral element is then mainly used to eliminate static difference, realizes controlling without margin for system.Error is used
Integral has certain hysteresis to system, when integrating too strong, so that system overshoot increases, so that cause to vibrate.Therefore,
When error is larger, τiiValue is smaller to avoid system overshoot；When error is smaller, τiiIt incrementally increases to eliminate the steady of system
State error.Determining tuning method can be as shown in Table 1 and Table 2, and wherein table 1 is proportional component for correcting scale parameter
τpi, table 2 is integral element amendment integral parameter τii。
The fuzzy solution includes: to calculate output control amount using gravity model appoach and obtain final accuracy.Calculation formula
It is as follows:
Wherein, Δ τpi、ΔτiiIn value domain be set as [- 3, -2, -1,0,1,2,3]；For input value e, ecObtain phase
After the Linguistic Value answered, 2 corrected parameter τ can be derived by Fuzzy tuning strategy according to the tuning method of Tables 1 and 2pi、
τiiFuzzy quantity.
For the effect for verifying the present embodiment, carries out emulation experiment and verified, specific as follows:
Under power distribution network and the operation of micro-grid connection state, the experiment parameter for acquiring the micro-capacitance sensor of Fig. 2 is as shown in table 3.And
Net current waveform and harmonic current analysis are as shown in Figure 8.As can be seen that not only including fundamental negative sequence current in grid-connected current, going back
It is higher comprising 5 positive and negative sequence current components and 7 positive-negative sequence harmonic current components, harmonic content.
Table 3
In the frequency dividing control strategy mentioned using the present embodiment, fundamental negative sequence current at points of common connection PCC, 5 times it is positive and negative
Sequence and 7 positive-negative sequence harmonic current components are effectively suppressed, as shown in figure 9, grid-connected current harmonic content is substantially reduced, sine degree
It improves, therefore, the PCS of battery energy storage system preferably compensates for grid-connected harmonic current caused by nonlinear-load.In addition, electric
The PCS active power of output of pond energy-storage system in the whole process and compensation electric current are as shown in Figure 10 and Figure 11, give simultaneously
The given value of electric current, such as Figure 12 are compensated, comparison diagram 11 and Figure 12 can be seen that PCS with preferable dynamic response performance.
Figure 13 and Figure 14 is respectively to compensate front and back distribution net side voltage current waveform, can be seen by comparison diagram 13 and Figure 14
Out, the PCS based on frequency dividing control strategy can be realized and the compensation of network reactive power, and power factor is about 0.9436 before compensating,
Power factor (PF) is almost 1 after compensation, while current sinusoidal degree is good, response curve is smooth.
The present embodiment is realized based on the PCS of frequency dividing control strategy to the harmonic wave and idle electricity under micro-grid connection operating status
The active control strategies of stream, and the related experiment verifying being incorporated into the power networks on a micro-capacitance sensor platform, experimental result table
Bright, mentioned control strategy can not only reduce micro-grid connection operation when reaching stable state while keeping microgrid power balance
Because of harmonic current content caused by nonlinear-load, can also be achieved the local compensation of idle inactivity.
Therefore, the multi-functional control strategy of this energy accumulation current converter is reducing micro-capacitance sensor power quality controlling cost and raising
There is important reference value in the utilization rate of energy storage device.
Embodiment 2
Present embodiments provide a kind of electronic equipment, including memory and processor and storage on a memory and are being located
The computer instruction run on reason device when the computer instruction is run by processor, completes method in one embodiment
Step.
Embodiment 3
A kind of computer readable storage medium is present embodiments provided, for storing computer instruction, the computer refers to
When order is executed by processor, in completion one embodiment the step of method.
The foregoing is merely preferred embodiment of the present disclosure, are not limited to the disclosure, for the skill of this field
For art personnel, the disclosure can have various modifications and variations.It is all within the spirit and principle of the disclosure, it is made any to repair
Change, equivalent replacement, improvement etc., should be included within the protection scope of the disclosure.
Although above-mentioned be described in conjunction with specific embodiment of the attached drawing to the disclosure, model not is protected to the disclosure
The limitation enclosed, those skilled in the art should understand that, on the basis of the technical solution of the disclosure, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within the protection scope of the disclosure.
Claims (10)
1. a kind of micro-grid connection control method based on energy accumulation current converter, characterized in that include the following steps:
S1, the three-phase voltage and three-phase current for acquiring grid-connected end；
S2, virtual sin cos functions are utilized according to the three-phase voltage and three-phase current numerical value of acquisition, calculates electrical network negative phase-sequence electric current, humorous
Involve reactive current；
S3, the given value exported according to electrical network negative phase-sequence electric current, harmonic wave and the reactive current and energy accumulation current converter of detection, using frequency dividing
The harmonic compensation current and watt current of control method control output energy accumulation current converter.
2. a kind of micro-grid connection control method based on energy accumulation current converter as described in claim 1, it is characterized in that: the benefit
It is quickly detected from electrical network negative phase-sequence electric current, harmonic wave and reactive current with virtual sin cos functions, is mended using based on phase locked loop error
The harmonic wave repaid is idle detection, step specifically:
Three-phase voltage, three-phase current are synchronized rotary reference coordinate transform by step 21, from three phase static a-b-c coordinate system
The static alpha-beta coordinate system of two-phase is transformed to, alpha-beta coordinate system voltage and current numerical value is obtained；
Step 22, alpha-beta coordinate system voltage are combined operation, eliminate fundamental wave negative sequence component, and filter AC compounent by LPF
It removes, obtains fundamental positive sequence DC component, and obtain a phase positive sequence fundamental wave DC voltage ua-1p +；
Step 23, by a phase positive sequence fundamental wave DC voltage ua-1p +It is carried out by the current values of phase-locked loop pll and alpha-beta coordinate system humorous
Wave detection, obtains the detected value i of power grid fundamental wave negative sequence component and harmonic waveαh、iβh, that is, contain electrical network negative phase-sequence electric current, harmonic wave and nothing
Function electric current.
3. a kind of micro-grid connection control method based on energy accumulation current converter as described in claim 1, it is characterized in that: step S3
The middle harmonic compensation current and watt current that output energy accumulation current converter is controlled using frequency division control method specifically:
31, according to grid-connected current detection value iαh、iβhWith current compensation given value iα *、iβ *It obtains energy accumulation current converter and exports electric current
Iαβ *And the frequency range of the higher top n of harmonic component content is set as frequency dividing compensation frequency range, compensates frequency in frequency dividing
Frequency dividing control output quantity is obtained using the ratio resonance frequency dividing control mode of complex vector parallel connection ratio control in range；
32, frequency dividing control output quantity and triangular wave are modulated, and generate the trigger pulse of switching device；
33, when energy accumulation current converter receives trigger pulse, energy accumulation current converter exports electric current Iαβ *。
4. a kind of micro-grid connection control method based on energy accumulation current converter as claimed in claim 3, it is characterized in that: the storage
It can output current of converter Iαβ *Including each harmonic component for needing to compensate, fundamental reactive current component, fundamental zero sequence current point
Amount, negative-sequence current component or/and grid-connected active current.
5. a kind of micro-grid connection control method based on energy accumulation current converter as claimed in claim 3, it is characterized in that: frequency dividing control
The calculation formula of output quantity processed are as follows:
In formula, τpoIt is ratio control item, τp、τiRespectively proportionality coefficient and integral coefficient, ω0For cutoff frequency.
6. a kind of micro-grid connection control method based on energy accumulation current converter as claimed in claim 3, it is characterized in that: the ratio
Example resonance frequency dividing control mode further includes the on-line tuning that ratio resonant parameter is carried out using fuzzy algorithmic approach.
7. a kind of micro-grid connection control system based on energy accumulation current converter, characterized in that micro- including micro-capacitance sensor and traditional power grid
Power grid includes distributed generation resource, load, energy storage device, the energy storage device include at least energy-storage battery, energy accumulation current converter and
Energy storage controller, the energy-storage battery are connect with energy accumulation current converter, and the energy storage controller and energy accumulation current converter are for controlling storage
Energy current transformer realizes that micro-capacitance sensor is incorporated to traditional power grid, and the energy storage controller executes the described in any item one kind of step 1-6 and is based on
The micro-grid connection control method of energy accumulation current converter.
8. a kind of micro-grid connection control system based on energy accumulation current converter as claimed in claim 7, characterized in that distributed
Power supply includes photo-voltaic power supply, wind power generation plant.
9. a kind of electronic equipment, characterized in that on a memory and on a processor including memory and processor and storage
The computer instruction of operation when the computer instruction is run by processor, is completed described in any one of claim 1-6 method
Step.
10. a kind of computer readable storage medium, characterized in that for storing computer instruction, the computer instruction is located
When managing device execution, step described in any one of claim 1-6 method is completed.
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| CN111404207A (en) * | 2020-03-24 | 2020-07-10 | 国电联合动力技术有限公司 | Power distribution network access control method and control system for generator set |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111404207A (en) * | 2020-03-24 | 2020-07-10 | 国电联合动力技术有限公司 | Power distribution network access control method and control system for generator set |
| CN111509708A (en) * | 2020-04-26 | 2020-08-07 | 云南电网有限责任公司电力科学研究院 | Low-voltage single-phase power supply conversion device and method |
| CN117239813A (en) * | 2023-11-15 | 2023-12-15 | 国网江苏省电力有限公司 | Low-voltage energy storage converter control method considering harmonic suppression |
| CN117239813B (en) * | 2023-11-15 | 2024-01-26 | 国网江苏省电力有限公司 | Low-voltage energy storage converter control method considering harmonic suppression |
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