CN110286275A - The method and device of system stability when a kind of determining equipment is grid-connected - Google Patents
The method and device of system stability when a kind of determining equipment is grid-connected Download PDFInfo
- Publication number
- CN110286275A CN110286275A CN201910428481.9A CN201910428481A CN110286275A CN 110286275 A CN110286275 A CN 110286275A CN 201910428481 A CN201910428481 A CN 201910428481A CN 110286275 A CN110286275 A CN 110286275A
- Authority
- CN
- China
- Prior art keywords
- equipment
- matrix
- grid
- point
- admittance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/16—Matrix or vector computation, e.g. matrix-matrix or matrix-vector multiplication, matrix factorization
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Data Mining & Analysis (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computing Systems (AREA)
- Databases & Information Systems (AREA)
- Software Systems (AREA)
- General Engineering & Computer Science (AREA)
- Algebra (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The embodiment of the present invention provide a kind of determining equipment it is grid-connected when system stability method and device, which comprises obtain the electric parameter of equipment, the line condition of the test equipment respectively；Respectively according to the electric parameter and the line condition, the admittance matrix of the equipment and the impedance matrix of route are obtained respectively, and according to the admittance matrix and the impedance matrix, calculate the grid-connected network of the equipment returns rate matrix；The corresponding curve of each diagonal entry in rate matrix is returned described in being obtained on a complex plane in frequency variation, if judgement knows that all curves all meet preset condition, it is determined that the equipment is in vibrational stabilization state when grid-connected；Wherein, the preset condition includes oscillation impact factor.Described device executes the above method.The method and device of system stability, can accurately determine oscillatory stability of equipment when grid-connected when determining equipment provided in an embodiment of the present invention is grid-connected.
Description
Technical field
The present invention relates to system stability when power electronic equipment technical field more particularly to a kind of grid-connected determining equipment
Method and device.
Background technique
In recent years, power electronic equipment (i.e. equipment) is widely applied in electric system, and still, equipment is when grid-connected
It is easy to happen oscillation problem, how to solve problems is particularly important.
Analysis of the oscillation method based on impedance or admittance matrix is a kind of important analysis method in the prior art, and is influenced
Equipment when grid-connected oscillatory stability it is many because being known as, it is existing to be considered based on the analysis of the oscillation method of impedance or admittance matrix
Factor it is not comprehensive enough so that the recognition result of oscillatory stability is inaccurate when equipment is grid-connected, to device-dependent
Staff brings more practical difficulty.
Therefore, how drawbacks described above is avoided, oscillatory stability of equipment when grid-connected can be accurately determined, becoming need
It solves the problems, such as.
Summary of the invention
In view of the problems of the existing technology, the embodiment of the present invention provide a kind of determining equipment it is grid-connected when system stability
Method and device.
The embodiment of the present invention provide a kind of determining equipment it is grid-connected when system stability method, comprising:
The electric parameter of equipment, the line condition of the test equipment are obtained respectively；
Respectively according to the electric parameter and the line condition, the admittance matrix and route of the equipment are obtained respectively
Impedance matrix, and according to the admittance matrix and the impedance matrix, calculate the grid-connected network of the equipment returns rate matrix；
The corresponding song of each diagonal entry in rate matrix is returned described in being obtained on a complex plane in frequency variation
Line, if judgement knows that all curves all meet preset condition, it is determined that the equipment is in vibrational stabilization state when grid-connected；Its
In, the preset condition is non-according to each of described time rate matrix comprising oscillation impact factor, the oscillation impact factor
What diagonal entry determined.
The embodiment of the present invention provide a kind of determining equipment it is grid-connected when system stability device, comprising:
Acquiring unit, for obtaining the electric parameter of equipment, the line condition of the test equipment respectively；
Computing unit, for obtaining leading for the equipment respectively respectively according to the electric parameter and the line condition
It receives the impedance matrix of matrix and route, and according to the admittance matrix and the impedance matrix, calculates the grid-connected net of the equipment
Network returns rate matrix；
Determination unit, for obtain on a complex plane frequency variation when described in return rate matrix in each diagonal entry
Corresponding curve, if judgement knows that all curves all meet preset condition, it is determined that the equipment is when grid-connected in vibration
Swing stable state；Wherein, the preset condition is to return rate square according to described comprising oscillation impact factor, the oscillation impact factor
What each off diagonal element in battle array determined.
The embodiment of the present invention provides a kind of electronic equipment, comprising: memory, processor and storage are on a memory and can be
The computer program run on processor, wherein
The processor realizes following method and step when executing described program:
The electric parameter of equipment, the line condition of the test equipment are obtained respectively；
Respectively according to the electric parameter and the line condition, the admittance matrix and route of the equipment are obtained respectively
Impedance matrix, and according to the admittance matrix and the impedance matrix, calculate the grid-connected network of the equipment returns rate matrix；
The corresponding song of each diagonal entry in rate matrix is returned described in being obtained on a complex plane in frequency variation
Line, if judgement knows that all curves all meet preset condition, it is determined that the equipment is in vibrational stabilization state when grid-connected；Its
In, the preset condition is non-according to each of described time rate matrix comprising oscillation impact factor, the oscillation impact factor
What diagonal entry determined.
The embodiment of the present invention provides a kind of non-transient computer readable storage medium, is stored thereon with computer program, should
Following method and step is realized when computer program is executed by processor:
The electric parameter of equipment, the line condition of the test equipment are obtained respectively；
Respectively according to the electric parameter and the line condition, the admittance matrix and route of the equipment are obtained respectively
Impedance matrix, and according to the admittance matrix and the impedance matrix, calculate the grid-connected network of the equipment returns rate matrix；
The corresponding song of each diagonal entry in rate matrix is returned described in being obtained on a complex plane in frequency variation
Line, if judgement knows that all curves all meet preset condition, it is determined that the equipment is in vibrational stabilization state when grid-connected；Its
In, the preset condition is non-according to each of described time rate matrix comprising oscillation impact factor, the oscillation impact factor
What diagonal entry determined.
The method and device of system stability when determining equipment provided in an embodiment of the present invention is grid-connected, if rate is known back in judgement
The corresponding curve of each diagonal entry in matrix meets the preset condition comprising oscillation impact factor, it is determined that sets
It is standby that vibrational stabilization state is in when grid-connected, oscillatory stability of equipment when grid-connected can be accurately determined.
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 this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 be present invention determine that when equipment is grid-connected system stability embodiment of the method flow chart；
Fig. 2 be present invention determine that when equipment is grid-connected system stability Installation practice structural schematic diagram；
Fig. 3 is electronic equipment entity structure schematic diagram provided in an embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Fig. 1 be present invention determine that when equipment is grid-connected system stability embodiment of the method flow chart, as shown in Figure 1, this hair
The method of system stability when a kind of determining equipment that bright embodiment provides is grid-connected, comprising the following steps:
S101: the electric parameter of equipment, the line condition of the test equipment are obtained respectively.
Specifically, device obtains the line condition of the electric parameter of equipment, the test equipment respectively.Device, which can be, to be set
For itself, it is also possible to be not especially limited with equipment there are other equipment of connection relationship etc..Equipment can be electric system
In power electronic equipment, electric parameter may include phaselocked loop, electric current loop and power ring, be not especially limited.Test equipment
Line condition, it can be understood as the line condition of equipment test request, be not especially limited.
S102: respectively according to the electric parameter and the line condition, obtain respectively the equipment admittance matrix and
The impedance matrix of route, and according to the admittance matrix and the impedance matrix, calculate the grid-connected network of the equipment returns rate
Matrix.
Specifically, device obtains the admittance of the equipment respectively according to the electric parameter and the line condition respectively
The impedance matrix of matrix and route, and according to the admittance matrix and the impedance matrix, calculate the grid-connected network of the equipment
Return rate matrix.It should be understood that the step of admittance matrix of the equipment is obtained according to the electric parameter, according to
The precedence that line condition obtains the step of impedance matrix of route is not especially limited.The admittance matrix can be in dq coordinate
Under system and under natural system of coordinates.
The method for obtaining admittance matrix can have following two method:
Method 1: derivation
The transfer function model that equipment can be constructed according to the specific value of phaselocked loop, electric current loop and power ring, further according to
The transfer function model obtains the admittance matrix of equipment, the impedance matrix of equipment can be first obtained by the transfer function model, so
The impedance matrix of equipment is converted to the admittance matrix of equipment again afterwards.Pass through the impedance matrix Z to equipmenteIt inverts to obtain equipment
Admittance matrix Ye。
Method 2: method is measured
The admittance matrix of the equipment, i.e. the harmonic wave electricity in grid entry point injection different frequency are obtained using Harmonic Injection Method
Stream, measurement grid entry point voltage flow into the electric current of equipment and flow into the electric current of network, to obtain the admittance matrix of equipment.
The impedance matrix of route can be calculated according to the line condition of equipment test request, specific calculating process is ability
Domain mature technology repeats no more.
Above-mentioned admittance matrix, impedance matrix and time rate matrix are two-dimensional matrix, according to the admittance matrix and the resistance
Anti- matrix, calculate the grid-connected network of the equipment returns rate matrix, can specifically include:
Described time rate matrix is calculated according to the following formula:
Wherein, L is described time rate matrix, ZgFor the impedance matrix, YeFor the admittance matrix；Wherein:
S103: each diagonal entry in rate matrix is returned described in being obtained on a complex plane in frequency variation and is respectively corresponded
Curve, if judgement know that all curves all meet preset condition, it is determined that the equipment when grid-connected be in vibrational stabilization shape
State；Wherein, the preset condition is according to every in described time rate matrix comprising oscillation impact factor, the oscillation impact factor
What a off diagonal element determined.
Specifically, device obtained on a complex plane in frequency variation described in return each diagonal entry point in rate matrix
Not corresponding curve, if judgement knows that all curves all meet preset condition, it is determined that the equipment is when grid-connected in oscillation
Stable state；Wherein, the preset condition is to return rate matrix according to described comprising oscillation impact factor, the oscillation impact factor
In each off diagonal element determine.Return the diagonal entry L in rate matrixaaA corresponding curve, is returned in rate matrix
Diagonal entry LbbCorresponding another curve.Determine that the equipment, in vibrational stabilization state, can be wrapped specifically when grid-connected
It includes:
If judgement knows that two curves are all located at L under the right of (- 1, j0) point of the complex plane and each Frequency pointaa
Distance to (- 1, j0) point is greater than | Lab| and LbbDistance to (- 1, j0) point is greater than | Lba|, it is determined that the equipment is simultaneously
Vibrational stabilization state is in when net；Or, two curves are all located at the right of (- 1, j0) point of the complex plane and each frequency
The lower L of pointaaDistance to (- 1, j0) point is greater than | Lba| and LbbDistance to (- 1, j0) point is greater than | Lab|, it is determined that it is described to set
It is standby that vibrational stabilization state is in when grid-connected.It should be understood that oscillation impact factor can be understood as | Lab| or | Lba|, can
According to the off diagonal element L returned in rate matrixabOr LbaIt determines.
Aforementioned stable method of discrimination comprehensively utilizes back the relationship estimation feature of rate matrix diagonal element and off-diagonal element
Value recycles the relationship of characteristic value and (- 1, j0) point in broad sense Nyquist criterion there may be region, obtains strictly adequately
System stability criterion.
The method of system stability when determining equipment provided in an embodiment of the present invention is grid-connected, if judgement is known back in rate matrix
The corresponding curve of each diagonal entry meet the preset condition comprising oscillation impact factor, it is determined that equipment is simultaneously
It is in vibrational stabilization state when net, oscillatory stability of equipment when grid-connected can be accurately determined.
On the basis of the above embodiments, the admittance matrix, the impedance matrix and described time rate matrix are two dimension
Matrix；Correspondingly, described according to the admittance matrix and the impedance matrix, calculate the grid-connected network of the equipment returns rate square
Battle array, comprising:
Described time rate matrix is calculated according to the following formula:
Wherein, L is described time rate matrix, ZgFor the impedance matrix, YeFor the admittance matrix；Wherein:
Specifically, device calculates described time rate matrix according to the following formula:
Wherein, L is described time rate matrix, ZgFor the impedance matrix, YeFor the admittance matrix；Wherein:
It can refer to above description, repeat no more.
The method of system stability when determining equipment provided in an embodiment of the present invention is grid-connected passes through specific formula and calculates equipment
Grid-connected network returns rate matrix, ensure that this method can be normally carried out.
On the basis of the above embodiments, if the judgement knows that all curves all meet preset condition, it is determined that described
Equipment is in vibrational stabilization state when grid-connected, comprising:
If judgement knows that two curves are all located at L under the right of (- 1, j0) point of the complex plane and each Frequency pointaa
Distance to (- 1, j0) point is greater than | Lab| and LbbDistance to (- 1, j0) point is greater than | Lba|, it is determined that the equipment is simultaneously
Vibrational stabilization state is in when net；
Or, two curves are all located at L under the right of (- 1, j0) point of the complex plane and each Frequency pointaaTo (- 1,
J0) distance put is greater than | Lba| and LbbDistance to (- 1, j0) point is greater than | Lab|, it is determined that the equipment when grid-connected at
In vibrational stabilization state.
Specifically, if judgement described in device knows that all curves all meet preset condition, it is determined that the equipment is grid-connected
When be in vibrational stabilization state, comprising:
If judgement knows that two curves are all located at L under the right of (- 1, j0) point of the complex plane and each Frequency pointaa
Distance to (- 1, j0) point is greater than | Lab| and LbbDistance to (- 1, j0) point is greater than | Lba|, it is determined that the equipment is simultaneously
Vibrational stabilization state is in when net；
Or, two curves are all located at L under the right of (- 1, j0) point of the complex plane and each Frequency pointaaTo (- 1,
J0) distance put is greater than | Lba| and LbbDistance to (- 1, j0) point is greater than | Lab|, it is determined that the equipment when grid-connected at
In vibrational stabilization state.It can refer to above description, repeat no more.
The method of system stability when determining equipment provided in an embodiment of the present invention is grid-connected, by specific preset condition,
It is further able to accurately determine oscillatory stability of equipment when grid-connected.
On the basis of the above embodiments, the admittance matrix for obtaining the equipment, comprising:
The admittance matrix of the equipment is obtained using Harmonic Injection Method.
Specifically, device obtains the admittance matrix of the equipment using Harmonic Injection Method.It can refer to above description, it is no longer superfluous
It states.
The method of system stability, is obtained by using Harmonic Injection Method when determining equipment provided in an embodiment of the present invention is grid-connected
The admittance matrix of equipment is taken, guarantees that this method can be normally carried out.
Fig. 2 be present invention determine that when equipment is grid-connected system stability Installation practice structural schematic diagram, as shown in Fig. 2,
The embodiment of the invention provides a kind of devices of determining equipment system stability when grid-connected, including acquiring unit 201, computing unit
202 and determination unit 203, in which:
Acquiring unit 201 for obtaining the electric parameter of equipment, the line condition of the test equipment respectively；Computing unit
202 for respectively according to the electric parameter and the line condition, obtains the admittance matrix and route of the equipment respectively
Impedance matrix, and according to the admittance matrix and the impedance matrix, calculate the grid-connected network of the equipment returns rate matrix；Really
Order member 203 for obtain on a complex plane frequency variation when described in return rate matrix in each diagonal entry respectively correspond
Curve, if judgement know that all curves all meet preset condition, it is determined that the equipment when grid-connected be in vibrational stabilization shape
State；Wherein, the preset condition is according to every in described time rate matrix comprising oscillation impact factor, the oscillation impact factor
What a off diagonal element determined.
Specifically, acquiring unit 201 for obtaining the electric parameter of equipment, the line condition of the test equipment respectively；
Computing unit 202 is used to obtain the admittance matrix of the equipment respectively respectively according to the electric parameter and the line condition
Returning for the grid-connected network of the equipment is calculated and according to the admittance matrix and the impedance matrix with the impedance matrix of route
Rate matrix；Determination unit 203 returns the diagonal line element of each of rate matrix described in being used to obtain on a complex plane in frequency variation
The corresponding curve of element, if judgement knows that all curves all meet preset condition, it is determined that the equipment is in when grid-connected
Vibrational stabilization state；Wherein, the preset condition is to return rate according to described comprising oscillation impact factor, the oscillation impact factor
What each off diagonal element in matrix determined.
The device of system stability when determining equipment provided in an embodiment of the present invention is grid-connected, if judgement is known back in rate matrix
The corresponding curve of each diagonal entry meet the preset condition comprising oscillation impact factor, it is determined that equipment is simultaneously
It is in vibrational stabilization state when net, oscillatory stability of equipment when grid-connected can be accurately determined.
On the basis of the above embodiments, the admittance matrix, the impedance matrix and described time rate matrix are two dimension
Matrix；Correspondingly, the computing unit 202 is specifically used for:
Described time rate matrix is calculated according to the following formula:
Wherein, L is described time rate matrix, ZgFor the impedance matrix, YeFor the admittance matrix；Wherein:
Specifically, the computing unit 202 is specifically used for: described time rate matrix is calculated according to the following formula:
Wherein, L is described time rate matrix, ZgFor the impedance matrix, YeFor the admittance matrix；Wherein:
The device of system stability when determining equipment provided in an embodiment of the present invention is grid-connected passes through specific formula and calculates equipment
Grid-connected network returns rate matrix, ensure that this method can be normally carried out.
On the basis of the above embodiments, the determination unit 203 is specifically used for:
If judgement knows that two curves are all located at L under the right of (- 1, j0) point of the complex plane and each Frequency pointaa
Distance to (- 1, j0) point is greater than | Lab| and LbbDistance to (- 1, j0) point is greater than | Lba|, it is determined that the equipment is simultaneously
Vibrational stabilization state is in when net；Or, two curves are all located at the right of (- 1, j0) point of the complex plane and each frequency
The lower L of pointaaDistance to (- 1, j0) point is greater than | Lba| and LbbDistance to (- 1, j0) point is greater than | Lab|, it is determined that it is described to set
It is standby that vibrational stabilization state is in when grid-connected.
Specifically, the determination unit 203 is specifically used for:
If judgement knows that two curves are all located at L under the right of (- 1, j0) point of the complex plane and each Frequency pointaa
Distance to (- 1, j0) point is greater than | Lab| and LbbDistance to (- 1, j0) point is greater than | Lba|, it is determined that the equipment is simultaneously
Vibrational stabilization state is in when net；Or, two curves are all located at the right of (- 1, j0) point of the complex plane and each frequency
The lower L of pointaaDistance to (- 1, j0) point is greater than | Lba| and LbbDistance to (- 1, j0) point is greater than | Lab|, it is determined that it is described to set
It is standby that vibrational stabilization state is in when grid-connected.
The device of system stability when determining equipment provided in an embodiment of the present invention is grid-connected, by specific preset condition,
It is further able to accurately determine oscillatory stability of equipment when grid-connected.
On the basis of the above embodiments, the computing unit 202 is specifically used for:
The admittance matrix of the equipment is obtained using Harmonic Injection Method.
Specifically, the computing unit 202 is specifically used for: obtaining the admittance matrix of the equipment using Harmonic Injection Method.
The device of system stability, is obtained by using Harmonic Injection Method when determining equipment provided in an embodiment of the present invention is grid-connected
The admittance matrix of equipment is taken, guarantees that this method can be normally carried out.
The device of system stability specifically can be used for executing above-mentioned when determining equipment provided in an embodiment of the present invention is grid-connected
The process flow of each method embodiment, details are not described herein for function, is referred to the detailed description of above method embodiment.
Fig. 3 is electronic equipment entity structure schematic diagram provided in an embodiment of the present invention, as shown in figure 3, the electronic equipment
It include: processor (processor) 301, memory (memory) 302 and bus 303；
Wherein, the processor 301, memory 302 complete mutual communication by bus 303；
The processor 301 is used to call the program instruction in the memory 302, to execute above-mentioned each method embodiment
Provided method, for example, obtain the electric parameter of equipment, the line condition of the test equipment respectively；Basis respectively
The electric parameter and the line condition, obtain the admittance matrix of the equipment and the impedance matrix of route respectively, and according to
The admittance matrix and the impedance matrix, calculate the grid-connected network of the equipment returns rate matrix；It obtains on a complex plane
The corresponding curve of each diagonal entry in rate matrix is returned described in when frequency changes, if judgement knows that all curves are all full
Sufficient preset condition, it is determined that the equipment is in vibrational stabilization state when grid-connected；Wherein, the preset condition includes oscillation shadow
Ring the factor, the oscillation impact factor is determined according to each off diagonal element returned in rate matrix.
The present embodiment discloses a kind of computer program product, and the computer program product includes being stored in non-transient calculating
Computer program on machine readable storage medium storing program for executing, the computer program include program instruction, when described program instruction is calculated
When machine executes, computer is able to carry out method provided by above-mentioned each method embodiment, for example, obtains the electricity of equipment respectively
The line condition of gas parameter, the test equipment；Respectively according to the electric parameter and the line condition, respectively described in acquisition
The admittance matrix of equipment and the impedance matrix of route, and according to the admittance matrix and the impedance matrix, calculate the equipment
Grid-connected network returns rate matrix；Each diagonal entry in rate matrix is returned described in being obtained on a complex plane in frequency variation
Corresponding curve, if judgement knows that all curves all meet preset condition, it is determined that the equipment is when grid-connected in vibration
Swing stable state；Wherein, the preset condition is to return rate square according to described comprising oscillation impact factor, the oscillation impact factor
What each off diagonal element in battle array determined.
The present embodiment provides a kind of non-transient computer readable storage medium, the non-transient computer readable storage medium
Computer instruction is stored, the computer instruction makes the computer execute method provided by above-mentioned each method embodiment, example
Include: obtain the electric parameter of equipment, test respectively as described in equipment line condition；Respectively according to the electric parameter and institute
Line condition is stated, obtains the admittance matrix of the equipment and the impedance matrix of route respectively, and according to the admittance matrix and institute
Impedance matrix is stated, calculate the grid-connected network of the equipment returns rate matrix；It is returned described in being obtained on a complex plane in frequency variation
The corresponding curve of each diagonal entry in rate matrix, if judgement knows that all curves all meet preset condition, really
The fixed equipment is in vibrational stabilization state when grid-connected；Wherein, the preset condition includes oscillation impact factor, the oscillation
Impact factor is determined according to each off diagonal element returned in rate matrix.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can be stored in a computer readable storage medium, the program
When being executed, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned includes: ROM, RAM, magnetic disk or light
The various media that can store program code such as disk.
The apparatus embodiments described above are merely exemplary, wherein described, unit can as illustrated by the separation member
It is physically separated with being or may not be, component shown as a unit may or may not be physics list
Member, it can it is in one place, or may be distributed over multiple network units.It can be selected according to the actual needs
In some or all of the modules achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying creativeness
Labour in the case where, it can understand and implement.
Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can
It realizes by means of software and necessary general hardware platform, naturally it is also possible to pass through hardware.Based on this understanding, on
Stating technical solution, substantially the part that contributes to existing technology can be embodied in the form of software products in other words, should
Computer software product may be stored in a computer readable storage medium, such as ROM/RAM, magnetic disk, CD, including several fingers
It enables and using so that a computer equipment (can be personal computer, server or the network equipment etc.) executes each implementation
Method described in certain parts of example or embodiment.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of method of system stability when determining equipment is grid-connected characterized by comprising
The electric parameter of equipment, the line condition of the test equipment are obtained respectively；
Respectively according to the electric parameter and the line condition, the impedance of the admittance matrix and route of the equipment is obtained respectively
Matrix, and according to the admittance matrix and the impedance matrix, calculate the grid-connected network of the equipment returns rate matrix；
The corresponding curve of each diagonal entry in rate matrix is returned described in being obtained on a complex plane in frequency variation, if
Judgement knows that all curves all meet preset condition, it is determined that the equipment is in vibrational stabilization state when grid-connected；Wherein, institute
It is according to each off-diagonal in described time rate matrix that preset condition, which is stated, comprising oscillation impact factor, the oscillation impact factor
What element determined.
The method of system stability when 2. determining equipment according to claim 1 is grid-connected, which is characterized in that the admittance square
Battle array, the impedance matrix and described time rate matrix are two-dimensional matrix；Correspondingly, described according to the admittance matrix and the resistance
Anti- matrix, calculate the grid-connected network of the equipment returns rate matrix, comprising:
Described time rate matrix is calculated according to the following formula:
Wherein, L is described time rate matrix, ZgFor the impedance matrix, YeFor the admittance matrix；Wherein:
The method of system stability when 3. determining equipment according to claim 2 is grid-connected, which is characterized in that if the judgement
Know that all curves all meet preset condition, it is determined that the equipment is in vibrational stabilization state when grid-connected, comprising:
If judgement knows that two curves are all located at L under the right of (- 1, j0) point of the complex plane and each Frequency pointaaIt arrives
The distance of (- 1, j0) point is greater than | Lab| and LbbDistance to (- 1, j0) point is greater than | Lba|, it is determined that the equipment is grid-connected
When be in vibrational stabilization state；
Or, two curves are all located at L under the right of (- 1, j0) point of the complex plane and each Frequency pointaaTo (- 1, j0)
The distance of point is greater than | Lba| and LbbDistance to (- 1, j0) point is greater than | Lab|, it is determined that the equipment is when grid-connected in vibration
Swing stable state.
The method of system stability when 4. determining equipment according to any one of claims 1 to 3 is grid-connected, which is characterized in that institute
State the admittance matrix for obtaining the equipment, comprising:
The admittance matrix of the equipment is obtained using Harmonic Injection Method.
The device of system stability when 5. a kind of determining equipment is grid-connected characterized by comprising
Acquiring unit, for obtaining the electric parameter of equipment, the line condition of the test equipment respectively；
Computing unit, for obtaining the admittance square of the equipment respectively respectively according to the electric parameter and the line condition
The impedance matrix of battle array and route, and according to the admittance matrix and the impedance matrix, calculate the grid-connected network of the equipment
Return rate matrix；
Determination unit, for obtain on a complex plane frequency variation when described in return rate matrix in each diagonal entry difference
Corresponding curve, if judgement knows that all curves all meet preset condition, it is determined that the equipment is steady in oscillation when grid-connected
Determine state；Wherein, the preset condition comprising oscillation impact factor, the oscillation impact factor is returned in rate matrix according to described
Each off diagonal element determine.
The device of system stability when 6. determining equipment according to claim 5 is grid-connected, which is characterized in that the admittance square
Battle array, the impedance matrix and described time rate matrix are two-dimensional matrix；Correspondingly, the computing unit is specifically used for:
Described time rate matrix is calculated according to the following formula:
Wherein, L is described time rate matrix, ZgFor the impedance matrix, YeFor the admittance matrix；Wherein:
The device of system stability when 7. determining equipment according to claim 6 is grid-connected, which is characterized in that described determining single
Member is specifically used for:
If judgement knows that two curves are all located at L under the right of (- 1, j0) point of the complex plane and each Frequency pointaaIt arrives
The distance of (- 1, j0) point is greater than | Lab| and LbbDistance to (- 1, j0) point is greater than | Lba|, it is determined that the equipment is grid-connected
When be in vibrational stabilization state；
Or, two curves are all located at L under the right of (- 1, j0) point of the complex plane and each Frequency pointaaTo (- 1, j0)
The distance of point is greater than | Lba| and LbbDistance to (- 1, j0) point is greater than | Lab|, it is determined that the equipment is when grid-connected in vibration
Swing stable state.
8. according to claim 5 to 7 it is any it is described locking equipment is grid-connected really when system stability device, which is characterized in that institute
Computing unit is stated to be specifically used for:
The admittance matrix of the equipment is obtained using Harmonic Injection Method.
9. a kind of electronic equipment including memory, processor and stores the calculating that can be run on a memory and on a processor
Machine program, which is characterized in that the processor is realized when executing described program such as any one of Claims 1-4 the method
Step.
10. a kind of non-transient computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer
It is realized when program is executed by processor such as the step of any one of Claims 1-4 the method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910428481.9A CN110286275B (en) | 2019-05-22 | 2019-05-22 | Method and device for determining system stability during equipment grid connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910428481.9A CN110286275B (en) | 2019-05-22 | 2019-05-22 | Method and device for determining system stability during equipment grid connection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110286275A true CN110286275A (en) | 2019-09-27 |
| CN110286275B CN110286275B (en) | 2020-09-15 |
Family
ID=68002306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910428481.9A Expired - Fee Related CN110286275B (en) | 2019-05-22 | 2019-05-22 | Method and device for determining system stability during equipment grid connection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110286275B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112014642A (en) * | 2020-08-03 | 2020-12-01 | 清华大学 | Power grid frequency coupling impedance model aggregation calculation method and device under static coordinate system |
| CN112909924A (en) * | 2021-01-22 | 2021-06-04 | 武汉大学 | Method for acquiring small interference stability domain of new energy power system in operation and control parameter combination space |
| CN114552648A (en) * | 2022-03-09 | 2022-05-27 | 浙江大学 | New energy base grid-connected system stability improving method and device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106329563A (en) * | 2015-06-28 | 2017-01-11 | 华为技术有限公司 | Method for checking grid-connection stability of inverter and inverter |
| CN106532685A (en) * | 2016-10-26 | 2017-03-22 | 浙江大学 | Generalized impedance criterion calculation method for stability analysis of grid-connected inverter and application |
| CN106786776A (en) * | 2017-02-15 | 2017-05-31 | 云南电网有限责任公司 | A kind of method using generalized impedance method analysis grid-connected inverter system stability is corrected |
| CN107741528A (en) * | 2017-11-17 | 2018-02-27 | 南方电网科学研究院有限责任公司 | Method and device for scanning broken line impedance of power system |
| CN107994606A (en) * | 2017-11-27 | 2018-05-04 | 浙江大学 | Grid-connected inverter system method for analyzing stability under a kind of multi-frequency coupling factor Coexistence Situation |
| CN109449958A (en) * | 2018-11-29 | 2019-03-08 | 云南电网有限责任公司 | A kind of double-fed blower grid-connected system method for analyzing stability |
-
2019
- 2019-05-22 CN CN201910428481.9A patent/CN110286275B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106329563A (en) * | 2015-06-28 | 2017-01-11 | 华为技术有限公司 | Method for checking grid-connection stability of inverter and inverter |
| CN106532685A (en) * | 2016-10-26 | 2017-03-22 | 浙江大学 | Generalized impedance criterion calculation method for stability analysis of grid-connected inverter and application |
| CN106786776A (en) * | 2017-02-15 | 2017-05-31 | 云南电网有限责任公司 | A kind of method using generalized impedance method analysis grid-connected inverter system stability is corrected |
| CN107741528A (en) * | 2017-11-17 | 2018-02-27 | 南方电网科学研究院有限责任公司 | Method and device for scanning broken line impedance of power system |
| CN107994606A (en) * | 2017-11-27 | 2018-05-04 | 浙江大学 | Grid-connected inverter system method for analyzing stability under a kind of multi-frequency coupling factor Coexistence Situation |
| CN109449958A (en) * | 2018-11-29 | 2019-03-08 | 云南电网有限责任公司 | A kind of double-fed blower grid-connected system method for analyzing stability |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112014642A (en) * | 2020-08-03 | 2020-12-01 | 清华大学 | Power grid frequency coupling impedance model aggregation calculation method and device under static coordinate system |
| CN112909924A (en) * | 2021-01-22 | 2021-06-04 | 武汉大学 | Method for acquiring small interference stability domain of new energy power system in operation and control parameter combination space |
| CN114552648A (en) * | 2022-03-09 | 2022-05-27 | 浙江大学 | New energy base grid-connected system stability improving method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110286275B (en) | 2020-09-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108667048B (en) | Frequency domain stability judging method and device for oscillation stability of new energy grid-connected system | |
| CN110286275A (en) | The method and device of system stability when a kind of determining equipment is grid-connected | |
| CN109521275B (en) | Synchronous phasor determination method, system, device and readable storage medium | |
| CN110045186B (en) | System harmonic impedance estimation method and system at power system common connection point | |
| CN109119999A (en) | A kind of model parameters of electric power system discrimination method and device | |
| CN109755937A (en) | A kind of regional power grid inertia calculation method and apparatus based on measurement | |
| CN108054757A (en) | A kind of embedded idle and voltage N-1 Close loop security check methods | |
| CN108984783A (en) | A method of processing of successively decreasing is carried out using big data | |
| CN109444515A (en) | A kind of idle, uneven and harmonic detecting method based on SDFT algorithm | |
| CN108089095B (en) | Power grid low-frequency oscillation parameter prediction method and device | |
| CN110867889A (en) | Method and system for judging oscillation stability of wind power plant/unit accessed to alternating current power grid | |
| CN113094887B (en) | Optimization method and device for frequency-shifting electromagnetic transient simulation and electronic equipment | |
| CN207472983U (en) | A kind of electric network impedance on-line identification device based on PRBS disturbance injections | |
| CN109557365A (en) | Network voltage frequency and phase-angle detection method and system, single-phase power grid detection system | |
| CN117277350A (en) | Impedance calculation, power grid stability analysis method, storage medium and terminal equipment | |
| KR102690534B1 (en) | Method for Estimating Model Parameters of Generator Based on PMU(Phasor Measurement Unit) Measurement | |
| CN105572472B (en) | The frequency measurement method and system of distributed generation resource environment | |
| CN110289633A (en) | The method and device of stability when a kind of determining equipment is grid-connected | |
| CN109143371A (en) | A kind of noise remove method and device of seismic data | |
| CN110896218B (en) | Harmonic modeling method and system for establishing collective residential load | |
| CN108469575A (en) | Power oscillation risk checking method and system of the wind turbine through soft straight power grid transmitting system | |
| CN108233379A (en) | Test method, device, equipment and storage medium for safety and stability control device | |
| CN108090846B (en) | Method and device for constructing power grid low-frequency oscillation case library | |
| CN114825372A (en) | Method for quickly and accurately extracting subsynchronous/supersynchronous oscillation signals | |
| JP2015146679A (en) | Power system monitoring device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200915 |