CN109256817A - Control the method and device that DC micro-electric network interface inverter carries out frequency adjusting - Google Patents
Control the method and device that DC micro-electric network interface inverter carries out frequency adjusting Download PDFInfo
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- CN109256817A CN109256817A CN201811426244.0A CN201811426244A CN109256817A CN 109256817 A CN109256817 A CN 109256817A CN 201811426244 A CN201811426244 A CN 201811426244A CN 109256817 A CN109256817 A CN 109256817A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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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Abstract
The method that the invention discloses a kind of to carry out frequency adjusting for controlling DC micro-electric network interface inverter, the actual electric network angular frequency value in current power distribution network can be determined using the actual electric network voltage value of power distribution network, after obtaining actual electric network angular frequency value, determine that the standard DC voltage value that inverter needs to export, the DC voltage value of the output of inverter at this time need standard DC voltage value corresponding with actual electric network angular frequency value equal to achieve the purpose that the frequency to power distribution network is adjusted using actual electric network angular frequency value.Therefore, using this programme, DC micro-electric network interface inverter is controlled to output voltage disclosed in power distribution network by the actual DC voltage value of the energy storage device of direct-current grid DC side, realizes the purpose that the frequency of power distribution network is adjusted.In addition, the invention also discloses a kind of device for carrying out frequency adjusting for controlling DC micro-electric network interface inverter, effect is as above.
Description
Technical field
The present invention relates to electrical network fields, in particular to a kind of to carry out frequency tune for controlling DC micro-electric network interface inverter
The method and device of section.
Background technique
Direct-current grid refers to the micro-capacitance sensor that electric energy transmission and distribution are carried out using direct current, when direct-current grid works in
When grid-connect mode, direct-current grid is connected with power distribution network by inverter, so that the transmitted in both directions of electric energy is carried out, it is micro- in direct current
When being connected between power grid and power distribution network by inverter, inverter is worked under controllable DC voltage mode, guarantees that direct current is female
The stabilization of line voltage.
It is inverse to the interface of direct-current grid but when being connected between direct-current grid and power distribution network by inverter
The control main purpose for becoming device is itself safety and stability for guaranteeing direct-current grid.Currently, for three bridge arm knot of three-phase
For the inverter of structure, do not account for that the frequency of power distribution network is adjusted using the energy storage device of direct-current grid DC side,
And the frequency of active power and power distribution network that DC micro-electric network interface inverter is exported or absorbed to power distribution network has direct relationship.
Therefore, how by the energy storage device of direct-current grid DC side to DC micro-electric network interface inverter to power distribution network
The output voltage of offer is controlled, and realizes that it is that those skilled in the art need what is solved to ask that the frequency of power distribution network, which is adjusted,
Topic.
Summary of the invention
It is an object of the invention to disclose a kind of side that frequency adjusting is carried out for controlling DC micro-electric network interface inverter
Method and device, by the voltage value of the energy storage device of direct-current grid DC side to DC micro-electric network interface inverter to power distribution network
Disclosed output voltage is controlled, and realizes and the frequency of power distribution network is adjusted.
To achieve the above object, the embodiment of the invention discloses following technical solutions:
First, frequency adjusting is carried out for controlling DC micro-electric network interface inverter the embodiment of the invention discloses a kind of
Method, the inverter of three bridge arm structure of three-phase applied to external L filter, comprising:
Obtain the actual electric network voltage value of power distribution network, the actual DC voltage value of energy storage device and described in direct-current grid
The actual output current value of inverter；
Actual electric network angular frequency value is determined using the actual electric network voltage value；
Standard direct current is determined using the DC voltage rated value of the actual electric network angular frequency value and the energy storage device
Pressure value；
Calculate the voltage error value between the standard DC voltage value and the actual DC voltage value；
The output current rating of the inverter is calculated using the voltage error value and PI controller；
The output current rating and actual output current value are decomposed under dq two-phase rotating coordinate system, obtained
D axis output current rating, q axis output current rating, d axis actual output current value and q axis actual output current value；
To the d axis output current rating, the q axis output current rating, the d axis actual output current value and
The q axis actual output current value is modulated, and obtains modulation voltage with the frequency by the modulation voltage to the power distribution network
Rate is adjusted.
Optionally, described to be determined using the DC voltage rated value of the actual electric network angular frequency value and the energy storage device
Standard DC voltage value includes:
Calculate the frequency error value between the actual electric network angular frequency value and specified grid frequency value；
The product for calculating the frequency error value Yu automatic virtual blocks coefficient obtains the first product value；
By the frequency error value differentiated after first-order low-pass wave link and with virtual inertia coefficient phase
Multiply, obtains the second product；
Calculate first product value and second product value and value, obtain the error amount of DC voltage；
The error amount of the DC voltage and the DC voltage rated value are overlapped, the standard direct current is obtained
Pressure value.
Optionally, the automatic virtual blocks coefficient specifically uses following formula to calculate:
Wherein, D is the automatic virtual blocks coefficient, udc,maxFor maximum DC voltage value, udc,oIt is specified for the DC voltage
Value, ωmaxFor maximum electrical network angular frequency value, ωoFor specified angular frequency value；
Corresponding, the virtual inertia coefficient specifically uses following formula to calculate:
Wherein, J is the virtual inertia coefficient, CdcCapacitance, u for the energy storage devicedcFor the actual DC electricity
Pressure value.
Optionally, described to determine that actual electric network angular frequency value specifically includes using the actual electric network voltage value:
Locking phase is carried out to the actual electric network voltage value using phaselocked loop, obtains the actual electric network angular frequency value and phase
Angle.
Optionally, it is described to the output current rating and actual output current value under dq two-phase rotating coordinate system into
Row decomposes
The output current rating and the actual output current value are converted by abc coordinate system using the phase angle
To the dq two-phase rotating coordinate system and decompose.
Second, frequency adjusting is carried out for controlling DC micro-electric network interface inverter the embodiment of the invention discloses a kind of
Device, the inverter of three bridge arm structure of three-phase applied to external L filter, comprising:
Module is obtained, energy storage device is practical straight for obtaining the actual electric network voltage value of power distribution network, in direct-current grid
Flow the actual output current value of voltage value and the inverter；
First determining module, for determining actual electric network angular frequency value using the actual electric network voltage value；
Second determining module, it is specified for the DC voltage using the actual electric network angular frequency value and the energy storage device
It is worth and determines standard DC voltage value；
First computing module, for calculating the voltage between the standard DC voltage value and the actual DC voltage value
Error amount；
Second computing module, for calculating the output electric current of the inverter using the voltage error value and PI controller
Rated value；
Decomposing module is used for the output current rating and actual output current value under dq two-phase rotating coordinate system
It is decomposed, it is actually defeated to obtain d axis output current rating, q axis output current rating, d axis actual output current value and q axis
Current value out；
Modulation module, for real to the d axis output current rating, the q axis output current rating, the d axis
Border output current value and the q axis actual output current value are modulated, and obtain modulation voltage by the modulation voltage control
The frequency for making the power distribution network is adjusted.
Optionally, second determining module includes:
First computing unit, for calculating the frequency error between the actual electric network frequency values and specified grid frequency value
Value；
First product unit obtains the first product for calculating the product of the frequency error value Yu automatic virtual blocks coefficient
Value；
Second product unit, for the frequency error value to be differentiated simultaneously after first-order low-pass wave link
With virtual inertia multiplication, the second product is obtained；
Second computing unit obtains direct current for calculate first product value and second product value and value
The error amount of pressure；
Superpositing unit is obtained for the error amount of the DC voltage and the DC voltage rated value to be overlapped
The standard DC voltage value.
Optionally, first determining module includes:
Phase locking unit obtains the actual electric network for carrying out locking phase to the actual electric network voltage value using phaselocked loop
Angular frequency value and phase angle.
Optionally, the decomposing module includes:
Decomposition unit, for using the phase angle by the output current rating and the actual output current value by
Abc coordinate system is converted to the dq two-phase rotating coordinate system and is decomposed.
Third, the embodiment of the invention discloses another kinds to carry out frequency adjusting for controlling DC micro-electric network interface inverter
Device, the inverter of three bridge arm structure of three-phase applied to external L filter, comprising:
Memory, for storing computer program；
Processor, for executing the computer program stored in the memory to realize that any of the above mentioned is used for
Control the step of DC micro-electric network interface inverter carries out the method for frequency adjusting.
As it can be seen that disclosed by the embodiments of the present invention a kind of for controlling the progress frequency adjusting of DC micro-electric network interface inverter
Method can determine the actual electric network angular frequency value in current power distribution network using the actual electric network voltage value of power distribution network,
To after actual electric network angular frequency value, the standard DC voltage value that inverter needs to export is determined using actual electric network angular frequency value,
The DC voltage value of the output of inverter at this time need standard DC voltage value corresponding with actual electric network angular frequency value equal with
Achieve the purpose that the frequency of power distribution network is adjusted.Therefore, after obtaining standard DC voltage value, standard DC voltage is determined
Voltage error value between value and the actual DC voltage value of inverter recycles voltage error value to calculate the output electricity of inverter
Flow rated value, then the comprehensive decomposition amount of output current rating and actual output current value under dq two-phase rotating coordinate system: d axis
Output current rating, q axis output current rating, d axis actual output current value and q axis actual output current value, to each point
Solution amount is modulated to obtain final modulation voltage, at this point, the modulation voltage for being input to power distribution network is just to contain power distribution network
The output voltage of the inverter of electrical network angular frequency value.Therefore, using this programme, pass through the energy storage device of direct-current grid DC side
Actual DC voltage value DC micro-electric network interface inverter is controlled to output voltage disclosed in power distribution network, realize
The purpose that the frequency of power distribution network is adjusted.In addition, the embodiment of the invention also discloses one kind for controlling direct-current grid
Interface inverter carries out the device of frequency adjusting, and effect is as above.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of the three-phase three-leg inverter of external L filter disclosed by the embodiments of the present invention；
Fig. 2 is disclosed by the embodiments of the present invention a kind of for controlling the progress frequency adjusting of DC micro-electric network interface inverter
Method flow schematic diagram；
Fig. 3 is a kind of process schematic of output current rating for calculating inverter disclosed by the embodiments of the present invention；
Fig. 4 is a kind of solution procedure schematic diagram of modulation voltage disclosed by the embodiments of the present invention；
Fig. 5 is a kind of specific implementation flow diagram of step S23 disclosed by the embodiments of the present invention；
Fig. 6 is a kind of specific implementation process schematic of step S23 disclosed by the embodiments of the present invention；
Fig. 7 is disclosed by the embodiments of the present invention a kind of for controlling the progress frequency adjusting of DC micro-electric network interface inverter
Apparatus structure schematic diagram；
Fig. 8 is disclosed by the embodiments of the present invention another for controlling the progress frequency adjusting of DC micro-electric network interface inverter
Apparatus structure schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The method that the embodiment of the invention discloses a kind of to carry out frequency adjusting for controlling DC micro-electric network interface inverter
And device, the voltage value by the energy storage device of direct-current grid DC side are public to power distribution network to DC micro-electric network interface inverter
The output voltage opened is controlled, and realizes and the frequency of power distribution network is adjusted.
Firstly, the embodiment of the present invention is illustrated the structure of the inverter of three bridge arm structure of three-phase of external L filter,
Referring to Figure 1, Fig. 1 is a kind of structural representation of the three-phase three-leg inverter of external L filter disclosed by the embodiments of the present invention
Figure, wherein direct-current grid side connects energy storage device 10, and the voltage at energy storage device uses udcIt indicates, energy storage device 10 connects
Three bridge arm filter 20 of three-phase, three bridge arm filter of three-phase, 20 external connection L filter 30 are connect, L filter 30 connects power distribution network,
Wherein, the actual electric network voltage value of power distribution network uses ugIt indicates, the actual output current value of three bridge arm filter 20 of three-phase uses ig
It indicates, the actual DC voltage value of energy storage device uses u in direct-current griddcIt indicates.
Technical solution disclosed by the embodiments of the present invention is described in detail below with reference to Fig. 1, refers to Fig. 2, Fig. 2 is this
A kind of method flow schematic diagram carrying out frequency adjusting for controlling DC micro-electric network interface inverter disclosed in inventive embodiments,
This method comprises:
S21: obtain the actual electric network voltage value of power distribution network, in direct-current grid the actual DC voltage value of energy storage device and
The actual output current value of inverter.
When being connected between direct-current grid and power distribution network by inverter, to the interface inverter of direct-current grid
Control main purpose is itself safety and stability for guaranteeing direct-current grid.Currently, for the inverse of three bridge arm structure of three-phase
Become for device, does not account for that the frequency of power distribution network is adjusted using the energy storage device of direct-current grid DC side, and direct current
The frequency of active power and power distribution network that micro-capacitance sensor interface inverter is exported or absorbed to power distribution network has direct relationship, inverter
The voltage at the energy storage device of DC micro-electric network interface inverter can be passed through to the active power of output or the absorption of power distribution network
It is adjusted.Therefore, how the frequency of power distribution network to be adjusted as present invention master using the voltage value of the energy storage side of inverter
Technical problems to be solved.
Specifically, the actual electric network voltage value embodiment of the present invention of power distribution network uses u in the present embodimentgIt indicates, direct current is micro-
The actual DC voltage value of energy storage device uses u in power griddcIt indicates, the actual output current value of inverter uses igIt indicates.Its
In, u can be acquired using voltage sensor and current sensorg、udcAnd ig。
S22: actual electric network angular frequency value is determined using actual electric network voltage value.
Specifically, actual electric network angular frequency value can be by network voltage locking phase module PLL to practical electricity in the present embodiment
Net voltage value ugIt carries out locking phase and obtains actual electric network angular frequency value ω and phase angle (the contents of the section may refer to the prior art).This
Actual electric network angular frequency value is indicated using ω in inventive embodiments, and phase angle is indicated using θ.
S23: standard DC voltage value is determined using the DC voltage rated value of actual electric network angular frequency value and energy storage device.
Specifically, there are actual angular frequency value ω and specified angular frequency for power distribution network in the present embodiment0, obtaining reality
After electrical network angular frequency ω with specified angular frequency0Frequency error difference DELTA ω is obtained after making difference, then by actual electric network angular frequency
Rate ω is multiplied with automatic virtual blocks coefficient D, at the same by frequency error difference DELTA ω after first-order low-pass wave link by differential
Operation is simultaneously multiplied with virtual inertia coefficient J, and the error amount of the DC voltage of direct-current grid is obtained after two-part product superpositionHereafter the error amount of DC voltage is utilizedWith the rated value u of DC voltagedc,oIt is superimposed just to obtain standard direct current
Voltage value udc *。
S24: the voltage error value between standard DC voltage value and actual DC voltage value is calculated.
S25: the output current rating of inverter is calculated using voltage error value and PI controller.
Specifically, for the output electric current of inverter, there are the actual output current value i of inverter in the present embodimentg
With output current rating ig *.Step S25 is described in detail below with reference to Fig. 3, Fig. 3 is disclosed by the embodiments of the present invention one
The process schematic of the output current rating of kind calculating inverter；By actual DC voltage value udcWith standard DC voltage value
udc *It carries out obtaining direct current voltage error value as differenceBy direct current voltage error valueIt is input to after PI controller, passes through
The operation for crossing PI controller obtains output current rating ig *。
S26: output current rating and actual output current value are decomposed under dq two-phase rotating coordinate system, obtained
D axis output current rating, q axis output current rating, d axis actual output current value and q axis actual output current value.
Specifically, in the present embodiment, output current rating ig *With actual output current value igUnder abc coordinate system,
At this time in order to solve final modulation voltage, need output current rating ig *With actual output current value igBy abc coordinate
Under system's conversion to dq two-phase rotating coordinate system, and to output current rating i under dq two-phase rotating coordinate systemg *And reality output
Current value igIt is decomposed.
S27: practical to d axis output current rating, q axis output current rating, d axis actual output current value and q axis
Output current value is modulated, and obtains modulation voltage to adjust by frequency of the modulation voltage to power distribution network.
Specifically, modulation voltage uses u in the present embodimentiIt indicates, in order to which step S27 is described in detail, below
This step S27 is described in detail in conjunction with Fig. 4, Fig. 4 is a kind of solution procedure of modulation voltage disclosed by the embodiments of the present invention
Schematic diagram；Wherein, by d axis output current rating igd *, q axis output current rating igq *, d axis actual output current value igdWith
Q axis actual output current value igqBy the operation in Fig. 4, d axis modulation voltage u is obtainedidWith q axis modulation voltage uiq, then by d
Axis modulation voltage uidWith q axis modulation voltage uiqIt is synthesized to obtain modulation voltage ui.In Fig. 4, LfFor the inductance of L filter, ugd
For d axis actual electric network component of voltage, ugqFor q axis actual electric network component of voltage.
As it can be seen that disclosed by the embodiments of the present invention a kind of for controlling the progress frequency adjusting of DC micro-electric network interface inverter
Method can determine the actual electric network angular frequency value in current power distribution network using the actual electric network voltage value of power distribution network,
To after actual electric network angular frequency value, the standard DC voltage value that inverter needs to export is determined using actual electric network angular frequency value,
The DC voltage value of the output of inverter at this time need standard DC voltage value corresponding with actual electric network angular frequency value equal with
Achieve the purpose that the frequency of power distribution network is adjusted.Therefore, after obtaining standard DC voltage value, standard DC voltage is determined
Voltage error value between value and the actual DC voltage value of inverter recycles voltage error value to calculate the output electricity of inverter
Flow rated value, then the comprehensive decomposition amount of output current rating and actual output current value under dq two-phase rotating coordinate system: d axis
Output current rating, q axis output current rating, d axis actual output current value and q axis actual output current value, to each point
Solution amount is modulated to obtain final modulation voltage, at this point, the modulation voltage for being input to power distribution network is just to contain power distribution network
The output voltage of the inverter of electrical network angular frequency value.Therefore, using this programme, pass through the energy storage device of direct-current grid DC side
Actual DC voltage value DC micro-electric network interface inverter is controlled to output voltage disclosed in power distribution network, realize
The purpose that the frequency of power distribution network is adjusted.
Based on the above embodiment, the invention discloses the specific implementation embodiments of step S23, refer to Fig. 5, and Fig. 5 is this
A kind of specific implementation flow diagram of step S23 disclosed in inventive embodiments, as optional embodiment of the present invention, step
Rapid S23 is specifically included:
S231: the frequency error value between actual electric network angular frequency value and specified grid frequency value is calculated；
S232: the product of frequency error value and automatic virtual blocks coefficient is calculated, the first product value is obtained；
S233: by frequency error value differentiated after first-order low-pass wave link and with virtual inertia coefficient phase
Multiply, obtains the second product value；
S234: calculate the first product value and the second product value and value, obtain the error amount of DC voltage；
S235: the error amount of DC voltage and DC voltage rated value are overlapped, and obtain standard DC voltage value.
Specifically, being described in detail below with reference to Fig. 6 to this alternative embodiment in the present embodiment, referring to Fig. 6, Fig. 6
For a kind of specific implementation process schematic of step S23 disclosed by the embodiments of the present invention, obtain actual electric network angular frequency it
Afterwards with specified angular frequency0Frequency error difference DELTA ω is obtained after making difference, one side Δ ω is multiplied with automatic virtual blocks coefficient D, separately
One side Δ ω differentiate after first-order low-pass wave link (one section low-pass filter of input) and and virtual inertia
Coefficient J is multiplied, and obtains the error amount of DC voltageHereafter the error amount of DC voltage is utilizedWith DC voltage
Rated value udc,oIt is superimposed just to obtain standard DC voltage value udc *.In Fig. 6, TsFor time constant, s is laplace operator.
As optional embodiment of the present invention, automatic virtual blocks coefficient D specifically uses following formula to calculate:
Wherein, udc,maxFor maximum DC voltage value, udc,oFor DC voltage rated value, ωmaxFor maximum electrical network angular frequency
Value, ωoFor specified angular frequency value；
It can be by maximum DC voltage value u about automatic virtual blocks coefficient Ddc,maxIt is taken as 110% times of DC voltage rated value
udc,o, by maximum electrical network angular frequency value ωmaxIt is taken as 105 times of specified angular frequency value ωo.Specifically indicated using following formula:
As optional embodiment of the present invention, virtual inertia coefficient J specifically uses following formula to calculate:
Wherein, CdcCapacitance, u for energy storage devicedcFor actual DC voltage value.
Below to disclosed by the embodiments of the present invention a kind of for controlling the progress frequency adjusting of DC micro-electric network interface inverter
Device be illustrated, refer to Fig. 7, Fig. 7 is disclosed by the embodiments of the present invention a kind of inverse for controlling DC micro-electric network interface
Become the apparatus structure schematic diagram that device carries out frequency adjusting, which includes:
Obtain module 701, for obtaining the actual electric network voltage value of power distribution network, in direct-current grid energy storage device reality
The actual output current value of DC voltage value and inverter；
First determining module 702, for determining actual electric network angular frequency value using actual electric network voltage value；
Second determining module 703, it is true for the DC voltage rated value using actual electric network angular frequency value and energy storage device
Calibrate quasi- DC voltage value；
First computing module 704, for calculating the voltage error between standard DC voltage value and actual DC voltage value
Value；
Second computing module 705, for calculating the output current rating of inverter using voltage error value and PI controller
Value；
Decomposing module 706 is used for output current rating and actual output current value under dq two-phase rotating coordinate system
It is decomposed, it is actually defeated to obtain d axis output current rating, q axis output current rating, d axis actual output current value and q axis
Current value out；
Modulation module 707, for d axis output current rating, q axis output current rating, d axis actual output current
Value and q axis actual output current value are modulated, and obtain modulation voltage to control the frequency of power distribution network by modulation voltage and adjust.
As it can be seen that disclosed by the embodiments of the present invention a kind of for controlling the progress frequency adjusting of DC micro-electric network interface inverter
Device can determine the actual electric network angular frequency value in current power distribution network using the actual electric network voltage value of power distribution network,
To after actual electric network angular frequency value, the standard DC voltage value that inverter needs to export is determined using actual electric network angular frequency value,
The DC voltage value of the output of inverter at this time need standard DC voltage value corresponding with actual electric network angular frequency value equal with
Achieve the purpose that the frequency of power distribution network is adjusted.Therefore, after obtaining standard DC voltage value, standard DC voltage is determined
Voltage error value between value and the actual DC voltage value of inverter recycles voltage error value to calculate the output electricity of inverter
Flow rated value, then the comprehensive decomposition amount of output current rating and actual output current value under dq two-phase rotating coordinate system: d axis
Output current rating, q axis output current rating, d axis actual output current value and q axis actual output current value, to each point
Solution amount is modulated to obtain final modulation voltage, at this point, the modulation voltage for being input to power distribution network is just to contain power distribution network
The output voltage of the inverter of electrical network angular frequency value.Therefore, using this programme, pass through the energy storage device of direct-current grid DC side
Actual DC voltage value DC micro-electric network interface inverter is controlled to output voltage disclosed in power distribution network, realize
The purpose that the frequency of power distribution network is adjusted.
Based on above embodiments, as preferred embodiment, the second determining module 703 includes:
First computing unit is missed for calculating the frequency between the actual electric network angular frequency value and specified grid frequency value
Difference；
First product unit obtains the first product for calculating the product of the frequency error value Yu automatic virtual blocks coefficient
Value；
Second product unit, for the frequency error value to be differentiated simultaneously after first-order low-pass wave link
With virtual inertia multiplication, the second product is obtained；
Second computing unit obtains direct current for calculate first product value and second product value and value
The error amount of pressure；
Superpositing unit is obtained for the error amount of the DC voltage and the DC voltage rated value to be overlapped
The standard DC voltage value.
Based on above embodiments, as preferred embodiment, the first determining module 702 includes:
Phase locking unit obtains the actual electric network for carrying out locking phase to the actual electric network voltage value using phaselocked loop
Angular frequency value and phase angle.
Based on above embodiments, as preferred embodiment, decomposing module 706 includes:
Decomposition unit, for using the phase angle by the output current rating and the actual output current value by
Abc coordinate system is converted to the dq two-phase rotating coordinate system and is decomposed.
Refer to Fig. 8, Fig. 8 be it is disclosed by the embodiments of the present invention it is another for control DC micro-electric network interface inverter into
The apparatus structure schematic diagram that line frequency is adjusted, comprising:
Memory 801, for storing computer program；
Processor 802, for executing the computer program stored in the memory to realize that any of the above embodiment mentions
To for control DC micro-electric network interface inverter carry out frequency adjusting method the step of.
Another kind disclosed in the present embodiment is used to control the device that DC micro-electric network interface inverter carries out frequency adjusting, by
In the computer program that can call memory storage by processor, realize as disclosed in above-mentioned any embodiment for controlling
DC micro-electric network interface inverter carries out the step of method of frequency adjusting, so the present apparatus has with above-mentioned for controlling direct current
The same actual effect of method of micro-capacitance sensor interface inverter progress frequency adjusting.
Above to a kind of side for carrying out frequency adjusting for controlling DC micro-electric network interface inverter disclosed in the present application
Method and device are described in detail.Specific case used herein explains the principle and embodiment of the application
It states, the description of the example is only used to help understand the method for the present application and its core ideas.It should be pointed out that for this skill
For the those of ordinary skill in art field, under the premise of not departing from the application principle, several change can also be carried out to the application
Into and modification, these improvement and modification also fall into the protection scope of the claim of this application.
Each embodiment is described in a progressive manner in specification, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part illustration
?.
Claims (10)
1. a kind of method for carrying out frequency adjusting for controlling DC micro-electric network interface inverter, applied to external L filter
The inverter of three bridge arm structure of three-phase characterized by comprising
Obtain the actual electric network voltage value of power distribution network, the actual DC voltage value of energy storage device and the inversion in direct-current grid
The actual output current value of device；
Actual electric network angular frequency value is determined using the actual electric network voltage value；
Standard DC voltage value is determined using the DC voltage rated value of the actual electric network angular frequency value and the energy storage device；
Calculate the voltage error value between the standard DC voltage value and the actual DC voltage value；
The output current rating of the inverter is calculated using the voltage error value and PI controller；
The output current rating and actual output current value are decomposed under dq two-phase rotating coordinate system, obtain d axis
Output current rating, q axis output current rating, d axis actual output current value and q axis actual output current value；
To the d axis output current rating, the q axis output current rating, the d axis actual output current value and described
Q axis actual output current value is modulated, and obtains modulation voltage with the frequency tune by the modulation voltage to the power distribution network
Section.
2. the method according to claim 1 for carrying out frequency adjusting for controlling DC micro-electric network interface inverter, special
Sign is that the DC voltage rated value using the actual electric network angular frequency value and the energy storage device determines standard direct current
Voltage value includes:
Calculate the frequency error value between the actual electric network angular frequency value and specified grid frequency value；
The product for calculating the frequency error value Yu automatic virtual blocks coefficient obtains the first product value；
By the frequency error value differentiated after first-order low-pass wave link and with virtual inertia multiplication, obtain
To the second product value；
Calculate first product value and second product value and value, obtain the error amount of DC voltage；
The error amount of the DC voltage and the DC voltage rated value are overlapped, the standard DC voltage is obtained
Value.
3. the method according to claim 2 for carrying out frequency adjusting for controlling DC micro-electric network interface inverter, special
Sign is that the automatic virtual blocks coefficient specifically uses following formula to calculate:
Wherein, D is the automatic virtual blocks coefficient, udc,maxFor maximum DC voltage value, udc,oFor the DC voltage rated value,
ωmaxFor maximum electrical network angular frequency value, ωoFor specified angular frequency value；
Corresponding, the virtual inertia coefficient specifically uses following formula to calculate:
Wherein, J is the virtual inertia coefficient, CdcCapacitance, u for the energy storage devicedcFor the actual DC voltage value.
4. the method according to claim 1 for carrying out frequency adjusting for controlling DC micro-electric network interface inverter, special
Sign is, described to determine that actual electric network angular frequency value specifically includes using the actual electric network voltage value:
Locking phase is carried out to the actual electric network voltage value using phaselocked loop, obtains the actual electric network angular frequency value and phase angle.
5. the method according to claim 4 for carrying out frequency adjusting for controlling DC micro-electric network interface inverter, special
Sign is, described to carry out decomposition packet under dq two-phase rotating coordinate system to the output current rating and actual output current value
It includes:
The output current rating and the actual output current value are converted by abc coordinate system to institute using the phase angle
It states dq two-phase rotating coordinate system and decomposes.
6. a kind of device for carrying out frequency adjusting for controlling DC micro-electric network interface inverter, applied to external L filter
The inverter of three bridge arm structure of three-phase characterized by comprising
Obtain module, for obtaining the actual electric network voltage value of power distribution network, in direct-current grid energy storage device actual DC electricity
The actual output current value of pressure value and the inverter；
First determining module, for determining actual electric network angular frequency value using the actual electric network voltage value；
Second determining module, it is true for the DC voltage rated value using the actual electric network angular frequency value and the energy storage device
Calibrate quasi- DC voltage value；
First computing module, for calculating the voltage error between the standard DC voltage value and the actual DC voltage value
Value；
Second computing module, for calculating the output current rating of the inverter using the voltage error value and PI controller
Value；
Decomposing module, for being carried out under dq two-phase rotating coordinate system to the output current rating and actual output current value
It decomposes, obtains d axis output current rating, q axis output current rating, d axis actual output current value and q axis reality output electricity
Flow valuve；
Modulation module, for actually defeated to the d axis output current rating, the q axis output current rating, the d axis
Current value and the q axis actual output current value are modulated out, obtain modulation voltage to control institute by the modulation voltage
The frequency for stating power distribution network is adjusted.
7. the device according to claim 6 for carrying out frequency adjusting for controlling DC micro-electric network interface inverter, special
Sign is that second determining module includes:
First computing unit, for calculating the frequency error between the actual electric network angular frequency value and specified grid frequency value
Value；
First product unit obtains the first product value for calculating the product of the frequency error value Yu automatic virtual blocks coefficient；
Second product unit, for by the frequency error value differentiated after first-order low-pass wave link and with void
Quasi- inertia coeffeicent is multiplied, and obtains the second product value；
Second computing unit obtains DC voltage for calculate first product value and second product value and value
Error amount；
Superpositing unit obtains described for the error amount of the DC voltage and the DC voltage rated value to be overlapped
Standard DC voltage value.
8. the device according to claim 6 for carrying out frequency adjusting for controlling DC micro-electric network interface inverter, special
Sign is that first determining module includes:
Phase locking unit obtains the actual electric network angular frequency for carrying out locking phase to the actual electric network voltage value using phaselocked loop
Rate value and phase angle.
9. the device according to claim 8 for carrying out frequency adjusting for controlling DC micro-electric network interface inverter, special
Sign is that the decomposing module includes:
Decomposition unit, for utilizing the phase angle by the output current rating and the actual output current value by abc
Coordinate system is converted to the dq two-phase rotating coordinate system and is decomposed.
10. a kind of device for carrying out frequency adjusting for controlling DC micro-electric network interface inverter, applied to external L filter
The inverter of three bridge arm structure of three-phase characterized by comprising
Memory, for storing computer program；
Processor, for executing the computer program stored in the memory to realize as described in any one of claim 1 to 5
For control DC micro-electric network interface inverter carry out frequency adjusting method the step of.
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| DE4420853A1 (en) * | 1994-06-15 | 1995-12-21 | Iberdrola Sa | Matching conductors to reduce or remove interference |
| CN101841160A (en) * | 2009-03-19 | 2010-09-22 | 孔小明 | Grid-connection control method for solar photovoltaic power generation |
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| US20170047862A1 (en) * | 2014-04-30 | 2017-02-16 | Hunan University | Steady state control method for three-phase double-mode inverter |
| CN207251220U (en) * | 2017-05-15 | 2018-04-17 | 昆明理工大学 | A kind of solar energy power generating three phase full bridge grid-connected inverting system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4420853A1 (en) * | 1994-06-15 | 1995-12-21 | Iberdrola Sa | Matching conductors to reduce or remove interference |
| CN101841160A (en) * | 2009-03-19 | 2010-09-22 | 孔小明 | Grid-connection control method for solar photovoltaic power generation |
| US20170047862A1 (en) * | 2014-04-30 | 2017-02-16 | Hunan University | Steady state control method for three-phase double-mode inverter |
| CN104092245A (en) * | 2014-07-24 | 2014-10-08 | 阳光电源股份有限公司 | Alternating-current bypass single-phase photovoltaic inverter and control method and control device thereof |
| CN207251220U (en) * | 2017-05-15 | 2018-04-17 | 昆明理工大学 | A kind of solar energy power generating three phase full bridge grid-connected inverting system |
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