CN103117553A - Novel power quality regulator on background of micro-grid - Google Patents
Novel power quality regulator on background of micro-grid Download PDFInfo
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- CN103117553A CN103117553A CN2012103422237A CN201210342223A CN103117553A CN 103117553 A CN103117553 A CN 103117553A CN 2012103422237 A CN2012103422237 A CN 2012103422237A CN 201210342223 A CN201210342223 A CN 201210342223A CN 103117553 A CN103117553 A CN 103117553A
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- 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
- Y02E40/30—Reactive power compensation
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- 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
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Abstract
The invention provides a novel power quality regulator on the background of a micro-grid aiming at a power quality management problem in the micro-grid. According to the novel power quality regulator on the background of the micro-grid, a distributed power source and energy storage elements are added on the basis of an original parallel connection mixed type active electricity filter, an improved type id-iq compound directive current detection and combining implement method are adopted, and demand that one machine is provided with a plurality of functions is met. According to the novel power quality regulator on the background of the micro-grid, harmonic wave and reactive current compensation of the micro-grid are effectively solved, at the same time, grid-connection generating functions of distributed power source are well achieved, and governance cost of the power quality of the micro-grid is saved to the greatest extent. Simulation and experiment operating data show that the design scheme is effective and reliable.
Description
Technical field
The present invention relates to the little electrical network quality of power supply regulate with improvement field, particularly a kind of little electrical network background under the new electric energy quality adjustor.
Background technology
The improving constantly of network system permeability, electrical network will face by little electrical network distributed power source and the caused power quality problem of nonlinear load along with little electrical network.Improve in the engineering application of the quality of power supply, the Parallel Hybrid Active Power Filter (hybrid active power filter, HAPF) that is composed in parallel by passive filter group and active filter has a wide range of applications.Yet due to the time-varying characteristics of nonlinear load, HAPF is in the low-power operation state often, and efficient is not fully exerted.In little electrical network, distributed power source has extremely strong intermittence and randomness in addition, and the distributed electrical source grid-connected inverter can not remain under specified output operating mode always, and the capacity factor measure of distributed electrical source grid-connected inverter is lower, causes the waste of inverter output capacity.In recent years, the residual capacity of developing little power grid inverter is improved the relevant issues of the electrical network quality of power supply, begins to obtain people's concern.In the 6th phase in 2011 " Proceedings of the IEEE ", " Options for Control of Reactive Power by Distributed Photovoltaic Generator " literary composition points out that photovoltaic combining inverter can transmit reactive power, can keep the voltage stabilization with the public junction of large electrical network, but have the not controlled shortcoming of inverter output reactive power; In the 3rd phase in 2011 " IEEE Transactions on Power Electronics ", the harmonic wave of inverter and the relevant issues of no-power compensation function in the distributed generation system studied in " Enhanced Power Quality Control Strategy for Single-Phase Inverters in Distributed Generation System " literary composition, reached certain effect, weak point is that inverter need add the output current limiting device, otherwise exists out-of-work risk.
Summary of the invention
The objective of the invention is to propose the new electric energy quality adjustor under a kind of little electrical network background.It has increased distributed power source and energy-storage travelling wave tube on the basis of original Parallel Hybrid Active Power Filter, adopt a kind of modified model id-iq compound instruction current detecting and synthetic implementation method, realized preferably the requirement of one-machine-multi-function, this device is when effectively solving little mains by harmonics and reactive-current compensation, also can better realize the distributed power source function of generating electricity by way of merging two or more grid systems, reach the at utmost saving on the power quality controlling cost.The simulation and experiment service data shows, this design effectively, reliable.Its principle and principal character are:
Little electrical network new electric energy quality adjustor that the present invention proposes is comprised of combining inverter, control unit, passive filter group, distributed power source and energy-storage units, the combining inverter DC side is connected with energy-storage units and distributed power source, AC is connected with electrical network with power capacitor by reactance, reactance and power capacitor will be tuned to certain fixedly subharmonic, consist of the passive L-C filter of single tuning, wherein, original APF inverter AC output inductor is comprised among the passive L-C filter inductance of single tuning; During device work, the electrical network fundamental voltage all puts on combining inverter AC power capacitor, and the passive filter assembling is located at load-side, and both realize harmonic wave and reactive power compensation on the spot jointly, distributed power source is connected with electrical network by combining inverter, realizes generating electricity by way of merging two or more grid systems of distributed power source;
The control section of little electrical network new electric energy quality adjustor is mainly the meritorious instruction current that generates electricity by way of merging two or more grid systems, the humorous calculating of reactive power compensation command current and both compose operations of involving, add a pi regulator on the path of the present invention after three-phase current is through d, q coordinate transform, low pass filter, the threephase load electric current is meritorious first-harmonic through the DC component that Coordinate Conversion, low pass filter and pi regulator obtain
,
Refer to the virtual voltage by distributed power source output
With the maximum power point voltage that calculates
Through the meritorious DC component that obtains after voltage-regulation, the compound control command electric current of little electrical network new electric energy quality adjustor is synthetic through following algorithm
Little electrical network new electric energy quality adjustor outputs to electrical network to compound control command electric current, both can realize harmonic wave control and reactive power compensation, can realize the function of generating electricity by way of merging two or more grid systems again, reach the effect of one-machine-multi-function, farthest the input cost of saves energy quality controlling device.
Description of drawings
The little electrical network new electric energy of Fig. 1 quality adjustor topological structure
The little electrical network new electric energy of Fig. 2 quality adjustor one phase equivalent circuit
Fig. 3 instruction current detects and the composition principle block diagram
Electric current, voltage waveform before Fig. 4 new electric energy quality adjustor drops into
Fig. 5 new electric energy quality adjustor drops into after-current, voltage waveform
Fig. 6 power network current, voltage waveform
Fig. 7 system electrical schematic diagram
Fig. 8 line voltage and inverter output current wave
Fig. 9 line voltage, current waveform figure
Figure 10 is table 1 power network current harmonics containing ratio.
Embodiment
Little electrical network new electric energy quality adjustor topological structure:
The topological structure of little electrical network new electric energy quality adjustor as shown in Figure 1.Formed by combining inverter and control unit, passive filter group, little electrical network distributed power source and energy-storage units.The combining inverter DC side is connected with energy-storage units and distributed power source, AC is connected with electrical network with power capacitor by reactance, reactance and power capacitor will be tuned to certain fixedly subharmonic, consist of the passive L-C filter of single tuning, wherein, original APF inverter AC output inductor is comprised among the passive L-C filter inductance of single tuning, as seen APF in parallel compares with routine, only increased a tuning capacitor, both keep the simplest structure, had again the plurality of advantages of mixed compensation device.And, when combining inverter hinders and after haveing no alternative but bypass, due to the existence of the passive L-C filter of single tuning, this device still can play filter action for some reason.
When device work, the electrical network fundamental voltage all puts on combining inverter AC power capacitor, reduce to greatest extent the capacity of APF inverter, passive filter assembling simultaneously is located at load-side and realizes local compensation, in APF, dc voltage will hang down much than the electrical network fundamental voltage, distributed power source can directly be connected with combining inverter and no longer need boost conversion circuit, has improved the efficient that distributed power source generates electricity by way of merging two or more grid systems, and has reduced cost.
The operation principle of little electrical network new electric energy quality adjustor:
Little electrical network new electric energy quality adjustor one phase equivalent circuit as shown in Figure 2.Wherein the combining inverter of the little electrical network distributed power source of DC side band and energy-storage units is a desirable controlled voltage source by equivalence
, the nonlinear load in electrical network can be a desirable current source by equivalence.In figure
,
,
,
The electric current that represents respectively network system branch road, HAPF branch road, PPF branch road and inverter output branch road;
Be system's equivalent reactance of HAPF access point,
,
Be respectively the equiva lent impedance of inverter output branch road and PPF branch road;
,
,
,
Be respectively the equiva lent impedance of two passive filtering branch road electric capacity and inductance.And then obtain
Finding the solution this equation group gets
When the used time of doing of this device performance power quality adjusting device of needs, control active inverter output current
Contain harmonic wave and idle instruction current gets final product.When distributed power source generates electricity by way of merging two or more grid systems by this device, but control inverter output gets final product with the meritorious fundamental current of electrical network with the frequency homophase.
The detection of compound instruction electric current and synthetic:
Little electrical network new electric energy quality adjustor not only will be completed the function that distributed power source generates electricity by way of merging two or more grid systems, and also will realize the function of reactive power compensation and harmonic wave control.Major part is generate electricity by way of merging two or more grid systems meritorious instruction current, the humorous calculating of reactive power compensation command current and both compose operations of involving.In order better to guarantee combining inverter is realized the control precision of harmonic compensation, the present invention improves traditional id-iq method, add a pi regulator on path after three-phase current is through d, q coordinate transform, low pass filter, effectively reduce the pi regulator impact of system parameters on the harmonic signal accuracy of detection before.Compound instruction current detecting and composition principle are as shown in Figure 3.
The threephase load electric current is meritorious first-harmonic through the DC component that Coordinate Conversion, low pass filter and pi regulator obtain
,
Refer to the virtual voltage by distributed power source output
Voltage with the distributed power source maximum power point that calculates
Through the meritorious DC component that obtains after voltage-regulation, the compound control command electric current of little electrical network new electric energy quality adjustor is synthetic through following algorithm
Little electrical network new electric energy quality adjustor outputs to electrical network to compound control command electric current, both can realize harmonic wave control and reactive power compensation, can realize the function of generating electricity by way of merging two or more grid systems again, reach the effect of one-machine-multi-function, farthest the input cost of saves energy quality controlling device.
The simulation and experiment interpretation of result
In Matlab/Simulink, set up the simulation circuit model of little electrical network new electric energy quality adjustor, system parameters is: three-phase 220V/50Hz AC power, the delayed trigger thyristor rectifier bridge, rectification load is that 20 Ω resistance are connected with the 10mH inductance, the little electrical network distributed power source of 700V DC power supply equivalence, PWM switching frequency 10kHz.By the formation that changes current-order, the new electric energy quality adjustor is operated under different output modes, concrete emulation is as follows:
(1) only output harmonic wave and reactive current of new electric energy quality adjustor
Getting the direction that flows to electrical network is the electric current positive direction, and before the new electric energy quality adjustor drops into, system's monophase current, voltage waveform are as shown in Figure 4.Electric current flows to load from electrical network, and wave distortion is serious, and exists obvious phase place to lag behind, and system harmonics electric current resultant distortion rate is up to 31.1%.When the new electric energy quality adjustor puts after-current, voltage waveform into operation as shown in Figure 5, visible this moment waveform close to sine wave, harmonic current resultant distortion rate reduces to 1.1%, the electrical network quality of power supply is greatly improved.Show that the new electric energy quality adjustor brought into play the effect of power quality adjusting device preferably.
(2) the new electric energy quality adjustor is exported meritorious, the humorous reactive current that involves
Electrical network single-phase voltage, current waveform are as shown in Figure 6 at this moment, as seen electric current, voltage are with the frequency homophase, show that the new electric energy quality adjustor has not only compensated the required idle and harmonic component of load, also provide active energy to electrical network and load, brought into play preferably the effect of one-machine-multi-function.
In order better to verify the feasibility of this new electric energy quality adjustor, carried out related experiment.0.2kV new electric energy quality adjustor experimental system as shown in Figure 7, the passive filter group comprises branch road 5,11 times.System parameters L 5=0.25mH, C5=1590.3 μ F, L11=0.11mH, C11=795.3 μ F, L0=0.7mH, C0=10.3 μ F, Cdc=4950 μ F, the distributed power source equivalence is the 700V DC source.
(1) the new electric energy quality adjustor sends the unity power factor active current
Fig. 8 is a phase line voltage (400V/div) in when experiment and a oscillogram of inverter output current (20A/div) mutually.Can find out from oscillogram, to the good active current of the electrical network sinusoidal degree of output, power factor controlling is at comparatively desirable extent and scope by the new electric energy quality adjustor for DG.By FLUKE 43B type power quality analyzer, Injection Current is analyzed, the total percent harmonic distortion of electric current is only 0.8%, has realized preferably sending to electrical network the target of the sinusoidal active energy of unity power factor.
(2) the new electric energy quality adjustor provides meritorious, idle while compensating load harmonic wave to electrical network
Fig. 9 is line voltage (400V/div), electric current (20A/div) oscillogram, and table 1 is characteristic harmonics component analysis result.From chart as can be known, total percent harmonic distortion of power network current is reduced to 3.8%, actual measurement source current 11.6A, and meritorious is-1880W that reactive power is-3457.6Var.The active power of electrical network and reactive power are all less than zero at this moment, illustrate that the new electric energy quality adjustor provides its needed active current and most harmonic current to load, also unnecessary active current and reactive current are transmitted back to electrical network simultaneously, the 5th, 7,11 times characteristic harmonics has also obtained good inhibition, has reached the GB requirement.The current waveform of electrical network is improved.
The present invention proposes the new electric energy quality adjustor under a kind of little electrical network background, labor its operation principle advance, and adopt a kind of modified model id-iq compound instruction current detecting and synthesize implementation method, the simulation and experiment data show that the new electric energy quality adjustor realized the function of original power quality adjusting device and the dual-use function that generates electricity by way of merging two or more grid systems preferably, have verified the feasibility of scheme.
Claims (1)
1. the new electric energy quality adjustor under a little electrical network background, be primarily characterized in that: little electrical network new electric energy quality adjustor that the present invention proposes is by combining inverter, control unit, the passive filter group, distributed power source and energy-storage units form, the combining inverter DC side is connected with energy-storage units and distributed power source, AC is connected with electrical network with power capacitor by reactance, reactance and power capacitor will be tuned to certain fixedly subharmonic, consist of the passive L-C filter of single tuning, wherein, original APF inverter AC output inductor is comprised among the passive L-C filter inductance of single tuning, during device work, the electrical network fundamental voltage all puts on combining inverter AC power capacitor, and the passive filter assembling is located at load-side, and both realize harmonic wave and reactive power compensation on the spot jointly, distributed power source is connected with electrical network by combining inverter, realizes generating electricity by way of merging two or more grid systems of distributed power source,
The control section of little electrical network new electric energy quality adjustor is mainly the meritorious instruction current that generates electricity by way of merging two or more grid systems, the humorous calculating of reactive power compensation command current and both compose operations of involving, add a pi regulator on the path of the present invention after three-phase current is through d, q coordinate transform, low pass filter, the DC component that the threephase load electric current obtains through Coordinate Conversion, low pass filter and pi regulator is meritorious fundamental current, calculates harmonic wave, reactive power compensation electric current; Obtain afterwards meritorious DC component by the virtual voltage of distributed power source output and the maximum power point voltage that calculates through voltage-regulation, and then obtain the compound control command electric current of little electrical network new electric energy quality adjustor; Little electrical network new electric energy quality adjustor outputs to electrical network to compound control command electric current, both can realize harmonic wave control and reactive power compensation, can realize the function of generating electricity by way of merging two or more grid systems again, reach the effect of one-machine-multi-function, farthest the input cost of saves energy quality controlling device.
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| CN104993485A (en) * | 2015-06-26 | 2015-10-21 | 西安理工大学 | Parallel hybrid active filtering system and control method therefor |
| CN105301391A (en) * | 2015-10-20 | 2016-02-03 | 北京动力京工科技有限公司 | Island detection device and island detection method based on active filtering and harmonic compensation |
| US9620960B2 (en) | 2014-01-13 | 2017-04-11 | Abb Schweiz Ag | Control of a stabilizing energy storage in a microgrid |
| CN107925245A (en) * | 2015-07-09 | 2018-04-17 | 利莱森玛电机公司 | To charging impact, load come off and harmonic wave carry out improve processing electricity generation system |
| CN112531711A (en) * | 2020-12-03 | 2021-03-19 | 华中科技大学 | Medium-voltage power supply quality comprehensive adjusting system |
| CN117318126A (en) * | 2023-11-30 | 2023-12-29 | 山东华天电气有限公司 | Micro-grid power quality optimization and energy storage integrated device and control method |
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| CN112531711B (en) * | 2020-12-03 | 2022-09-20 | 华中科技大学 | Medium-voltage power supply quality comprehensive adjusting system |
| CN117318126A (en) * | 2023-11-30 | 2023-12-29 | 山东华天电气有限公司 | Micro-grid power quality optimization and energy storage integrated device and control method |
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Application publication date: 20130522 |