CN109066680A - A kind of power transmission cable harmonic resonance suppressing method based on self adaptive control - Google Patents
A kind of power transmission cable harmonic resonance suppressing method based on self adaptive control Download PDFInfo
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
- 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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Abstract
The invention discloses a kind of power transmission cable harmonic resonance suppressing method based on self adaptive control, this method is directed to the scene that two micro-capacitance sensors are interconnected by micro-capacitance sensor, pass through self adaptive control real-time detection power transmission cable midpoint harmonic voltage, the virtual harmonic wave resistance of on-line control realizes power transmission cable harmonic resonance active suppression；At the same time, the mentioned control method of the present invention can instruct the power transmission realized between two micro-capacitance sensors according to power dispatching.The present invention can achieve following two control target: first is that realizing that power transmission cable harmonic resonance inhibits according to the entire micro-capacitance sensor Equivalent Harmonic impedance of the horizontal on-line control of power transmission cable harmonic voltage；Second is that instructing the power transmission realized between two micro-capacitance sensors according to power dispatching.
Description
Technical field
The present invention relates to one kind to be applied to micro-capacitance sensor interacted system power transmission cable harmonic resonance suppressing method, and in particular to one
Power transmission cable harmonic resonance suppressing method of the kind based on self adaptive control.
Background technique
Micro-capacitance sensor is a kind of by distributed generation resource, load, energy storage device, current transformer and monitoring and protecting device organic combination
Small-sized electric system together.The key technologies such as operation control and energy management by micro-capacitance sensor, may be implemented it simultaneously
Net or isolated operation, the intermittent distributed generation resource of reduction give power distribution network bring to adversely affect, and maximally utilise distribution
Power supply power output, improves power supply reliability and power quality.Distributed generation resource is accessed into power distribution network in the form of micro-capacitance sensor, it is universal
One of be considered in such a way that distributed generation resource is effective, have in mountain area, outlying village, island group, urban power distribution network end etc.
Have broad application prospects.However due to the limitation of geographical conditions, the transmission of electricity electricity of long range is generally required between adjacent micro-capacitance sensor
Cable, there are biggish parasitic capacitance and parasitic inductances on route, easily cause harmonic resonance problem, lead to cable run aging,
The safety of route can even be jeopardized.
At present for the harmonic resonance and suppressing method of lower frequency in transmission line of electricity, resistive Active Power Filter-APF
It (RAPF) is a common approach.Resistive Active Power Filter-APF is typically mounted at feeder terminal, can be at specific frequency
Resistance characteristic is presented, provides damping for system.However, the value of damping resistance is than more elegant, inappropriate damping resistance value
It will lead to Harmonics amplification.At the same time, cable-line parameter, length variation and system harmonics composition transfer will lead to resonance frequency
The change of rate, influences damping.The shortcomings that for resistive Active Power Filter-APF bad adaptability, has scholar to propose improvement control
Algorithm processed allows Active Power Filter-APF to simulate unlimited long transmission line at specific frequency, being capable of effectively limiting circuitry resonance, and Shandong
Stick is good.However, this method still belongs to passive administering method, Harmonics amplification can only be inhibited, be unable to active absorption harmonic wave.Separately
Outside, traditional power transmission cable resonance suppressing method is often directed to single-ended radioactivity supply network, for micro- electricity proposed by the present invention
This kind of both end power supplying network of net interacted system, conventional method are simultaneously not suitable for.Since there is a harmonic source at both end power supplying network both ends, two
Harmonic wave interaction between person is increasingly complex with resonance characteristic, not yet appears in the newspapers for the power transmission cable resonance suppressing method of such scene
Road.
Summary of the invention
Purpose of the invention is to overcome the shortcomings in the prior art, provides a kind of transmission of electricity electricity based on self adaptive control
Cable harmonic resonance suppressing method, to reach following two control target: first is that horizontal online according to power transmission cable harmonic voltage
Entire micro-capacitance sensor Equivalent Harmonic impedance is adjusted, realizes that power transmission cable harmonic resonance inhibits；It is realized second is that being instructed according to power dispatching
Power transmission between two micro-capacitance sensors.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of power transmission cable harmonic resonance suppressing method based on self adaptive control is based on micro-capacitance sensor interacted system, wherein
The topological structure of whole system is that two micro-capacitance sensors are interconnected by power transmission cable, and each micro-capacitance sensor includes two distributed generation resources,
One nonlinear-load, is uniformly connected to points of common connection PCC, and the DC side of distributed generation resource grid-connected converter connects equivalent
DC power supply, exchange side connect LCL filter, and LCL filter is by current transformer side filter inductance L1, grid side filter inductance L2With
Filter capacitor CfComposition, nonlinear-load are not control full bridge rectifier；There is a detector of Harmonic Voltage at power transmission cable midpoint,
Each micro-capacitance sensor has a micro-capacitance sensor controller, and each distributed generation resource has an inverter controller, each inverter controller
Between information transmission use low bandwidth communication；Since the control strategy of each micro-capacitance sensor is identical, each distributed generation resource is grid-connected
The control strategy of current transformer is identical, therefore illustrates that the power transmission cable harmonic resonance inhibits with the first current transformer in the first micro-capacitance sensor
Method, comprising the following steps:
Step 1: the detector of Harmonic Voltage for being located at power transmission cable midpoint acquires corresponding points harmonic voltage, and calculate
Each harmonic voltage magnitude cmid,kth, wherein variable k represents overtone order, and k takes the odd number more than or equal to 3, later leads to information
It crosses low bandwidth communication and passes to two micro-capacitance sensor controllers, wherein the first micro-capacitance sensor controller realizes two targets: first micro- electricity
Net controller will be according to the harmonic wave equivalent resistance R of the first current transformer of harmonic voltage level calculationVk,MG1, while according to power dispatching
Instruct P*And Q*Voltage magnitude compensation rate Δ E and amount of frequency compensation Δ ω is calculated, current transformer control is passed to by low bandwidth communication afterwards
Device processed, specific as follows:
In formula (1), variable s is complex frequency,For the limit value of k subharmonic voltage, kpk,MG1And kik,MG1To calculate k
The proportionality coefficient and integral coefficient of subharmonic equivalent resistance, k in formula (2)pPAnd kiPFor the ratio system for calculating amount of frequency compensation Δ ω
Several and integral coefficient, kpQAnd kiQFor the proportionality coefficient and integral coefficient for calculating voltage magnitude compensation rate Δ E, PMG1And QMG1It is
One micro-capacitance sensor active power of output and reactive power；
Step 2: passing through sagging control after the first inverter controller receives frequency and voltage magnitude compensation rate Δ ω and Δ E
Device processed generates the reference of fundamental wave capacitance voltageIts angular frequency refers to ω*With amplitude reference E*It is as follows:
In formula (3), variable ω0For specified angular frequency, E0For rated voltage amplitude, DP,c1And DQ,c1For active sagging coefficient
With idle sagging coefficient, Pc1And Qc1The respectively active and reactive power of the first current transformer reality output, then fundamental wave capacitance voltage
It is referenced as
First current transformer receives harmonic wave equivalent resistance information RVk,MG1Afterwards, harmonic wave capacitance voltage ginseng is generated by the following method
It examines
In formula (4), variableFor the reference of k subharmonic voltage, N is parallel converters number of units, ILoadk,MG1For first micro- electricity
The k subharmonic current of net internal loading, ILk,c1For the k subharmonic current of the first current transformer output；The final capacitor of first current transformer
Voltage Reference is
Step 3: the first current transformer voltage-tracing controller uses dual-loop controller, final reference voltage is generated
Vout,c1, it is specific as follows:
In formula (5), variableFor the reference of k subharmonic current, GOuter(s) and GInner(s) be respectively outer ring controller and
Inner loop control device, variable VC,c1For the first current transformer capacitance voltage, variable IL,c1For the first output current of converter, outer loop control
Device GOuterIt (s) is ratio-resonant controller, variable kpv,c1For proportionality coefficient, variable kiv1,c1For first-harmonic resonance coefficient, variable
kivk,c1For k resonance coefficient, variable ωcFor resonant controller bandwidth, inner loop control device GInnerIt (s) is proportional controller,
kinner,c1For proportionality coefficient；
Obtain final reference voltage Vout,c1Afterwards, it according to sinusoidal pulse width modulation or space vector pulse width modulation, is opened
The duty cycle signals of pipe are closed, so that the first converter switches pipe of control being opened and turning off.
Compared with prior art, the beneficial effects brought by the technical solution of the present invention are as follows:
The present invention is directed to the scene that two micro-capacitance sensors are interconnected by micro-capacitance sensor, is transmitted electricity by self adaptive control real-time detection electric
Cable midpoint harmonic voltage, the virtual harmonic wave resistance of on-line control realize power transmission cable harmonic resonance active suppression；At the same time, originally
The power transmission realized between two micro-capacitance sensors can be instructed according to power dispatching by inventing proposed control method.
Detailed description of the invention
Fig. 1 is the topological structure schematic diagram of micro-capacitance sensor interacted system in the present invention；
Fig. 2 is the control schematic diagram of micro-capacitance sensor interacted system in the present invention；
Fig. 3 is the waveform diagram that the resistive Active Power Filter-APF of tradition inhibits power transmission cable resonance, and first passage is interconnection electricity
Voltage waveform at cable beginning x=0, second channel are the voltage waveform at interconnection cable x=3km, and third channel is interconnection electricity
Voltage waveform at cable x=4km, fourth lane are the voltage waveform at interconnection cable x=7km；
Fig. 4 is the waveform diagram that the present invention inhibits power transmission cable resonance, and first passage is the electricity at interconnection cable beginning x=0
Corrugating, second channel are the voltage waveform at interconnection cable x=3km, and third channel is the voltage at interconnection cable x=4km
Waveform, fourth lane are the voltage waveform at interconnection cable x=7km；
When Fig. 5 is is proposed control method using the resistive Active Power Filter-APF method of tradition and the present invention, interconnection cable is each
The voltage total harmonic distortion factor (THD) of position；
Fig. 6 is the dynamic response situation of power transmission between two micro-capacitance sensors；
Fig. 7 is the frequency of the first micro-capacitance sensor and the situation of change of PCC voltage magnitude during power dynamic response；
Fig. 8 is power transmission cable mid-point voltage and the first micro-capacitance sensor internal current waveform situation during power dynamic response；
First passage is the voltage waveform at the x=4 of interconnection cable midpoint, and second channel is the first current transformer output inside the first micro-capacitance sensor
Electric current, third channel are the second output current of converter inside the first micro-capacitance sensor, and fourth lane is the first micro-capacitance sensor internal load；
Specific embodiment
Technical solution of the present invention is described in further detail in the following with reference to the drawings and specific embodiments, it is described specific
Embodiment is only explained the present invention, is not intended to limit the invention.
The present invention is based on micro-capacitance sensor interacted system, a kind of power transmission cable harmonic resonance suppression based on self adaptive control of proposition
Method processed, wherein as shown in Figure 1, the topological structure of entire micro-capacitance sensor interacted system is that two micro-capacitance sensors are mutual by power transmission cable
Connection, each micro-capacitance sensor include two distributed generation resources, and a nonlinear-load is uniformly connected to points of common connection PCC, distributed
The DC side of power grid current transformer connects equivalent DC power supply, and exchange side connects LCL filter, and LCL filter is by unsteady flow
Device side filter inductance L1, grid side filter inductance L2With filter capacitor CfComposition, nonlinear-load are not control full bridge rectifier；
There is a detector of Harmonic Voltage at interconnection power transmission cable midpoint, and each micro-capacitance sensor has a micro-capacitance sensor controller, each distribution
Power supply has an inverter controller, and the information transmission between each controller uses low bandwidth communication (LBC)；Due to each micro- electricity
The control strategy of net is identical, and the control strategy of each distributed generation resource grid-connected converter is identical, therefore the present embodiment is micro- with first
Illustrate power transmission cable harmonic resonance suppressing method proposed by the invention for power grid, the first current transformer, comprising the following steps:
Step 1: the detector of Harmonic Voltage for being located at power transmission cable midpoint acquires corresponding points harmonic voltage, and calculate
Each harmonic voltage magnitude cmid,kth, wherein variable k represents overtone order, and k takes the odd number more than or equal to 3, engineers and technicians
It can according to need the suitable k value of selection, information passed into two micro-capacitance sensor controllers by low bandwidth communication later, wherein
First micro-capacitance sensor controller realizes two targets: the first micro-capacitance sensor controller will be according to the first current transformer of harmonic voltage level calculation
Harmonic wave equivalent resistance RVk,MG1, while P is instructed according to power dispatching*And Q*Calculate voltage magnitude compensation rate Δ E and frequency compensation
Δ ω is measured, inverter controller is passed to by low bandwidth communication afterwards, specific as follows:
In formula (1), variable s is complex frequency,For the limit value of k subharmonic voltage, kpk,MG1And kik,MG1To calculate k
The proportionality coefficient and integral coefficient of subharmonic equivalent resistance, k in formula (2)pPAnd kiPFor the ratio system for calculating amount of frequency compensation Δ ω
Several and integral coefficient, kpQAnd kiQFor the proportionality coefficient and integral coefficient for calculating voltage magnitude compensation rate Δ E, PMG1And QMG1It is
One micro-capacitance sensor active power of output and reactive power.This step will interconnect the harmonic voltage level and harmonic wave of power transmission cable midpoint
Virtual equivalent resistance is mapped, and adaptive harmonics restraint can be realized according to harmonic wave situation.
Step 2: as shown in Fig. 2, after the first inverter controller receives frequency and voltage magnitude compensation rate Δ ω and Δ E,
The reference of fundamental wave capacitance voltage is generated by droop control deviceIts angular frequency refers to ω*With amplitude reference E*It is as follows:
In formula (3), variable ω0For specified angular frequency, E0For rated voltage amplitude, DP,c1And DQ,c1For active sagging coefficient
With idle sagging coefficient, Pc1And Qc1For the active and reactive power of the first current transformer reality output, then fundamental wave capacitance voltage is joined
Examine for
First current transformer receives harmonic wave equivalent resistance information RVk,MG1Afterwards, harmonic wave capacitance voltage ginseng is generated by the following method
It examines
In formula (4), variableFor the reference of k subharmonic voltage, N is parallel converters number of units, ILoadk,MG1For first micro- electricity
The k subharmonic current of net internal loading, ILk,c1For the k subharmonic current of the first current transformer output.Formula (4) is virtual harmonic wave resistance
Specific implementation process.Therefore, the final capacitance voltage of the first current transformer is referenced as
Step 3: as shown in Fig. 2, the first current transformer voltage-tracing controller generates final ginseng using dual-loop controller
Examine voltage Vout,c1, it is specific as follows:
In formula (5), variableFor the reference of k subharmonic current, GOuter(s) and GInnerIt (s) is outer ring controller and inner ring
Controller, variable VC,c1For the first current transformer capacitance voltage, variable IL,c1For the first output current of converter, outer ring controller
GOuterIt (s) is ratio-resonant controller, variable kpv,c1For proportionality coefficient, variable kiv1,c1For first-harmonic resonance coefficient, variable
kivk,c1For k resonance coefficient, variable ωcFor resonant controller bandwidth, inner loop control device GInner(s) it is proportional controller, is
kinner,c1Proportionality coefficient.
Obtain final reference voltage Vout,c1Afterwards, it according to sinusoidal pulse width modulation or space vector pulse width modulation, is opened
The duty cycle signals of pipe are closed, so that the first converter switches pipe of control being opened and turning off；
Compared with prior art, the beneficial effects brought by the technical solution of the present invention are as follows:
The present invention is directed to the scene that two micro-capacitance sensors are interconnected by micro-capacitance sensor, is transmitted electricity by self adaptive control real-time detection electric
Cable midpoint harmonic voltage, the virtual harmonic wave resistance of on-line control realize power transmission cable harmonic resonance active suppression；At the same time, originally
The power transmission realized between two micro-capacitance sensors can be instructed according to power dispatching by inventing proposed control method.
Fig. 3-Fig. 8 is simulation waveform of the invention, and simulation model as shown in Figure 1 is built with Matlab/Simulink,
Control method proposed by the present invention is verified.Wherein interconnection cable shown in FIG. 1 is simulated by series LC circuit, every section of LC electricity
Lu represents 1km transmission line, altogether 9km transmission line.K=3,5,7,9 in simulations.Fig. 3-Fig. 5 demonstrates harmonic wave suppression of the invention
Effect processed, Fig. 6-Fig. 8 illustrate power dynamic response situation of the invention.
Fig. 3 is the waveform diagram that the resistive Active Power Filter-APF of tradition inhibits power transmission cable resonance, and first passage is interconnection electricity
Voltage waveform V (0) at cable beginning x=0, second channel are the voltage waveform V (3) at interconnection cable x=3km, third channel
For the voltage waveform V (4) at the x=4km of interconnection cable midpoint, fourth lane is the voltage waveform V at interconnection cable x=7km
(7).Although there are harmonic sources for power transmission cable two sides, the electricity from interconnection cable beginning x=0 can be seen that from first passage
Corrugating is good.However, can illustrate from second channel and third channel, the voltage positioned at interconnection cable middle position is produced
Apparent harmonic distortion, this is because interconnection cable produces amplification to specific subharmonic.Although feeder line two sides use resistive
Active Power Filter-APF, but Harmonics amplification is not effectively suppressed still.
Fig. 4 is the waveform diagram that the present invention inhibits power transmission cable resonance, and first passage is the electricity at interconnection cable beginning x=0
Corrugating V (0), second channel are the voltage waveform V (3) at interconnection cable x=3km, and third channel is interconnection cable x=4km
The voltage waveform V (4) at place, fourth lane are the voltage waveform V (7) at interconnection cable x=7km.The waveform in four channels at this time
Quality is all relatively good, without apparent harmonic distortion, illustrates that the present invention inhibits the validity of power transmission cable resonance.
In order to quantify the voltage waveform quality of Fig. 3 and Fig. 4, Fig. 5 is depicted using the resistive Active Power Filter-APF side of tradition
When method and mentioned control method of the invention, the voltage total harmonic distortion factor (THD) of interconnection cable each position.When resistive using tradition
When Active Power Filter-APF method, Harmonics amplification phenomenon is clearly present, and the percent harmonic distortion in interconnection cable middle position is obviously high
In both ends.And when using proposed control method of the invention, Harmonics amplification phenomenon is effectively suppressed, each position of interconnection cable
Percent harmonic distortion is in 5% or less limit value.
Fig. 6 illustrates the dynamic response situation of power transmission between two micro-capacitance sensors.System active power reference is in 2.5s
Shi Fasheng jump, is jumped by 1kW to 4kW.First micro-capacitance sensor active-power PMG1By the adjustment process of 1.3s, it is finally reached steady
State.And reactive power QMG1A maintenance level is maintained essentially in, there is no significant changes.Simulation result illustrates the present invention
The control method mentioned can instruct the power transmission realized between two micro-capacitance sensors according to power dispatching.
Fig. 7 illustrates the frequency of the first micro-capacitance sensor and the situation of change of PCC voltage magnitude during power dynamic response.?
Since power reference jumps when 2.5s, the about jump of 0.15Hz is also had occurred in the frequency of the first micro-capacitance sensor, by 1.3s
Adjustment process, it is final to stablize in 49.73Hz.In this process, the first micro-capacitance sensor PCC voltage magnitude maintains essentially in
218.5V there is no significant changes.
Fig. 8 is power transmission cable mid-point voltage and the first micro-capacitance sensor internal current waveform situation during power dynamic response.
First passage is the voltage waveform V (4) at the x=4 of interconnection cable midpoint, and second channel is the first current transformer inside the first micro-capacitance sensor
Export electric current IL,c1, third channel is the second output current of converter I inside the first micro-capacitance sensorL,c2, fourth lane is first micro- electricity
Net internal load ILoad,MG1.From first passage as can be seen that power transmission cable mid-point voltage waveform is good, illustrate that the power of system is dynamic
State has no effect on harmonic wave control effect, harmonic controling and fundamental wave control mutually decoupling when adjusting.Second channel and third channel wave
Shape is similar, illustrates that the stream of two current transformers works well.Fourth lane illustrates that the harmonic wave in system is drawn by nonlinear load
Enter.
To sum up, the method for the present invention can be realized simultaneously function between power transmission cable harmonic resonance active suppression and interconnection micro-capacitance sensor
Rate is controllable, is a strong robustness, interconnection grid control method easy to spread.
The present invention is not limited to embodiments described above.Above the description of specific embodiment is intended to describe and say
Bright technical solution of the present invention, the above mentioned embodiment is only schematical, is not restrictive.This is not being departed from
In the case of invention objective and scope of the claimed protection, those skilled in the art may be used also under the inspiration of the present invention
The specific transformation of many forms is made, within these are all belonged to the scope of protection of the present invention.
Claims (1)
1. a kind of power transmission cable harmonic resonance suppressing method based on self adaptive control is based on micro-capacitance sensor interacted system, wherein whole
The topological structure of a system is that two micro-capacitance sensors are interconnected by power transmission cable, and each micro-capacitance sensor includes two distributed generation resources, one
A nonlinear-load, is uniformly connected to points of common connection PCC, and the DC side of distributed generation resource grid-connected converter connects equivalent straight
Galvanic electricity source, exchange side connect LCL filter, and LCL filter is by current transformer side filter inductance L1, grid side filter inductance L2And filter
Wave capacitor CfComposition, nonlinear-load are not control full bridge rectifier；There is a detector of Harmonic Voltage at power transmission cable midpoint, often
A micro-capacitance sensor has a micro-capacitance sensor controller, and each distributed generation resource has an inverter controller, each inverter controller it
Between information transmission use low bandwidth communication；Since the control strategy of each micro-capacitance sensor is identical, each grid-connected change of distributed generation resource
The control strategy for flowing device is identical, therefore illustrates power transmission cable harmonic resonance inhibition side with the first current transformer in the first micro-capacitance sensor
Method, which comprises the following steps:
Step 1: the detector of Harmonic Voltage for being located at power transmission cable midpoint acquires corresponding points harmonic voltage, and calculate each time
Harmonic voltage amplitude cmid,kth, wherein variable k represents overtone order, and k takes the odd number more than or equal to 3, later passes through information low
Bandwidth communication passes to two micro-capacitance sensor controllers, wherein the first micro-capacitance sensor controller realizes two targets: the first micro-capacitance sensor control
Device processed will be according to the harmonic wave equivalent resistance R of the first current transformer of harmonic voltage level calculationVk,MG1, while being instructed according to power dispatching
P*And Q*Voltage magnitude compensation rate Δ E and amount of frequency compensation Δ ω is calculated, current transformer control is passed to by low bandwidth communication afterwards
Device, specific as follows:
In formula (1), variable s is complex frequency,For the limit value of k subharmonic voltage, kpk,MG1And kik,MG1To calculate k subharmonic
The proportionality coefficient and integral coefficient of equivalent resistance, k in formula (2)pPAnd kiPFor the proportionality coefficient and product for calculating amount of frequency compensation Δ ω
Divide coefficient, kpQAnd kiQFor the proportionality coefficient and integral coefficient for calculating voltage magnitude compensation rate Δ E, PMG1And QMG1For first micro- electricity
Net active power of output and reactive power；
Step 2: passing through droop control device after the first inverter controller receives frequency and voltage magnitude compensation rate Δ ω and Δ E
Generate the reference of fundamental wave capacitance voltageIts angular frequency refers to ω*With amplitude reference E*It is as follows:
In formula (3), variable ω0For specified angular frequency, E0For rated voltage amplitude, DP,c1And DQ,c1For active sagging coefficient and idle
Sagging coefficient, Pc1And Qc1The respectively active and reactive power of the first current transformer reality output, then fundamental wave capacitance voltage is referenced as
First current transformer receives harmonic wave equivalent resistance information RVk,MG1Afterwards, the reference of harmonic wave capacitance voltage is generated by the following method
In formula (4), variableFor the reference of k subharmonic voltage, N is parallel converters number of units, ILoadk,MG1For in the first micro-capacitance sensor
The k subharmonic current of load, ILk,c1For the k subharmonic current of the first current transformer output；The final capacitance voltage of first current transformer
It is referenced as
Step 3: the first current transformer voltage-tracing controller uses dual-loop controller, final reference voltage V is generatedout,c1, tool
Body is as follows:
In formula (5), variableFor the reference of k subharmonic current, GOuter(s) and GInnerIt (s) is respectively outer ring controller and inner ring control
Device processed, variable VC,c1For the first current transformer capacitance voltage, variable IL,c1For the first output current of converter, outer ring controller GOuter
It (s) is ratio-resonant controller, variable kpv,c1For proportionality coefficient, variable kiv1,c1For first-harmonic resonance coefficient, variable kivk,c1For k
Secondary resonance coefficient, variable ωcFor resonant controller bandwidth, inner loop control device GInnerIt (s) is proportional controller, kinner,c1For than
Example coefficient；
Obtain final reference voltage Vout,c1Afterwards, according to sinusoidal pulse width modulation or space vector pulse width modulation, switching tube is obtained
Duty cycle signals, so that the first converter switches pipe of control being opened and turning off.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110429601A (en) * | 2019-08-27 | 2019-11-08 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | A kind of isolated island micro-capacitance sensor PCC node voltage increased quality method |
| CN110649649A (en) * | 2019-08-29 | 2020-01-03 | 天津大学 | Low-cost voltage-free sensor carrier phase shifting method used under island microgrid |
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| CN103227581A (en) * | 2013-05-10 | 2013-07-31 | 湖南大学 | Inverter parallel harmonic wave ring current restraining method for controlling harmonic wave droop |
| CN104821706A (en) * | 2015-01-23 | 2015-08-05 | 国家电网公司 | Active damping scheme for multiple LCL inverter resonant coupling |
| CN105024406A (en) * | 2015-08-06 | 2015-11-04 | 合肥工业大学 | Composite virtual harmonic impedance control method for grid-connected inverter |
| CN107342598A (en) * | 2017-07-18 | 2017-11-10 | 西安交通大学 | A kind of isolated island micro-capacitance sensor harmonic power distribution method based on harmonic impedance control |
| CN107482682A (en) * | 2017-09-14 | 2017-12-15 | 湖南大学 | Active filter and distributed power source cooperative control method under a kind of off-network pattern |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110429601A (en) * | 2019-08-27 | 2019-11-08 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | A kind of isolated island micro-capacitance sensor PCC node voltage increased quality method |
| CN110649649A (en) * | 2019-08-29 | 2020-01-03 | 天津大学 | Low-cost voltage-free sensor carrier phase shifting method used under island microgrid |
| CN110649649B (en) * | 2019-08-29 | 2023-04-07 | 天津大学 | Low-cost voltage-free sensor carrier phase shifting method used under island microgrid |
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