CN110137949A - A kind of method and device for the mains by harmonics characteristic obtaining the station containing new energy - Google Patents
A kind of method and device for the mains by harmonics characteristic obtaining the station containing new energy Download PDFInfo
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- CN110137949A CN110137949A CN201910398840.0A CN201910398840A CN110137949A CN 110137949 A CN110137949 A CN 110137949A CN 201910398840 A CN201910398840 A CN 201910398840A CN 110137949 A CN110137949 A CN 110137949A
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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
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The invention discloses a kind of methods of mains by harmonics characteristic for obtaining the station containing new energy characterized by comprising establishes the node admittance matrix of Linear Network part；By emulation or on-the-spot test, the frequency response data of the Equivalent admittance of new energy station is obtained, and forms the supplement admittance matrix of the new energy station under different frequency using the frequency response data；At different frequencies, the supplement admittance matrix of each new energy station is included in the node admittance matrix of Linear Network part respectively, forms the node admittance matrix of full electric network；According to the node admittance matrix of the full electric network, the harmonic wave distribution of full electric network under harmonic disturbance is obtained, the harmonic distortion and overvoltage risk of power grid are assessed.Meets the needs of to Harmonic characteristic analysis.
Description
Technical field
This application involves the analysis fields of mains by harmonics, and in particular to a kind of mains by harmonics for obtaining the station containing new energy is special
Property method, while be related to it is a kind of obtain the station containing new energy mains by harmonics characteristic device.
Background technique
With the fast development of new energy and power electronics industry, for unbalanced source voltage and Voltage Harmonic
The not off-grid operation constraint of new energy unit gradually causes concern under the conditions of distortion.It is a large amount of due to electronic power conversion device
Using, always there is certain electric harmonic in power grid, as in power grid background harmonics and operation, non-linear equipment operation or therefore
Transient state harmonic wave during barrier etc. can make occur three-phase imbalance and low-order harmonic distortion in network voltage.In new energy unit
Under the action of controller, these harmonic components can generate harmonic current in the grid entry point of system can with electric network impedance reciprocation
Mains by harmonics can be caused to amplify, cause new energy unit tripping, or even influence partial electric grid operation.Therefore, for containing extensive
The power grid of new energy station access, needs to propose a kind of practical approach of Harmonic characteristic analysis, for power grid after harmonic injection
Harmonic voltage distribution is quickly calculated.
Summary of the invention
The application provides a kind of method of mains by harmonics characteristic for obtaining the station containing new energy, meets to Harmonic characteristic analysis
Demand.
The application provides a kind of method of mains by harmonics characteristic for obtaining the station containing new energy characterized by comprising
Establish the node admittance matrix of Linear Network part；
By simulation analysis or on-the-spot test, the frequency response data of the Equivalent admittance of new energy station is obtained, and is used
The frequency response data forms the supplement admittance matrix of the new energy station under different frequency；
At different frequencies, the supplement admittance matrix of each new energy station is included in the node of Linear Network part respectively
Admittance matrix forms the node admittance matrix of full electric network；
According to the node admittance matrix of the full electric network, the harmonic wave distribution of full electric network under harmonic disturbance is obtained, power grid is assessed
Harmonic distortion and overvoltage risk.
Preferably, the node admittance matrix for establishing Linear Network part, comprising:
According to the topology of Linear Network part, node and branch parameters, the node admittance matrix of Linear Network is established；
The admittance matrix is made of frequency response data, is specifically,
Preferably, by simulation analysis or on-the-spot test, the frequency response data of the Equivalent admittance of new energy station is obtained,
And the supplement admittance matrix of the new energy station under different frequency is formed using the frequency response data, comprising:
If then passing through emulation there are the access of new energy station in k-th of node (total node number that 1≤k≤n, n are power grid)
Analysis or on-the-spot test, obtain the frequency response data of new energy station Equivalent admittance；
The supplement admittance matrix that the admittance matrix is formed using the frequency response data is specifically,
Preferably, the node admittance matrix of the full electric network, specifically are as follows:
Wherein k ∈ R indicates that k-th of node has the access of new energy station.
Preferably, according to the node admittance matrix of the full electric network, the harmonic wave distribution of full electric network under harmonic disturbance is obtained, is led to
Cross the harmonic distortion and overvoltage risk of the harmonic wave distribution assessment power grid, comprising:
In the harmonic current source of a certain node injection target frequency of power grid；
According to the node admittance matrix of full electric network, the harmonic voltage that the harmonic wave acts on lower each node of power grid is calculated separately,
And then the harmonic wave distribution of full electric network is obtained, the harmonic distortion and overvoltage risk of power grid are assessed by the harmonic voltage.
Corresponding with method provided by the present application, the application provides a kind of mains by harmonics for obtaining the station containing new energy simultaneously
The device of characteristic characterized by comprising
Node admittance matrix establishes unit, establishes the node admittance matrix of Linear Network part；
Supplement admittance matrix establishes unit, by simulation analysis or on-the-spot test, obtains the Equivalent admittance of new energy station
Frequency response data, and using the frequency response data formed different frequency under the new energy station supplement admittance square
Battle array；
The node admittance matrix of full electric network establishes unit, at different frequencies, by the supplement admittance of each new energy station
Matrix is included in the node admittance matrix of Linear Network part respectively, forms the node admittance matrix of full electric network；
Assessment unit obtains the harmonic wave distribution of full electric network under harmonic disturbance according to the node admittance matrix of the full electric network,
Assess the harmonic distortion and overvoltage risk of power grid.
The application provides a kind of method of mains by harmonics characteristic for obtaining the station containing new energy, by emulating or surveying acquisition
The Equivalent admittance of new energy station is included in the node admittance matrix of full electric network, obtains full electric network by the impedance operator of new energy station
Harmonic wave distribution, assess the harmonic distortion and overvoltage risk of power grid, meet the needs of to Harmonic characteristic analysis.
Detailed description of the invention
Fig. 1 is that a kind of method flow of mains by harmonics characteristic for obtaining the station containing new energy provided by the embodiments of the present application shows
It is intended to；
Fig. 2 be the invention relates to the directly driven wind-powered unit of typical case topology diagram；
Fig. 3 be the invention relates to typical blower grid-side converter circuit topology and control principle drawing；
Fig. 4 be the invention relates to separate unit Wind turbines access the simulation model of simple power grid；
Fig. 5 is a kind of device signal of mains by harmonics characteristic for obtaining the station containing new energy provided by the embodiments of the present application
Figure.
Specific embodiment
Many details are explained in the following description in order to fully understand the application.But the application can be with
Much it is different from other way described herein to implement, those skilled in the art can be without prejudice to the application intension the case where
Under do similar popularization, therefore the application is not limited by following public specific implementation.
Fig. 1 is please referred to, Fig. 1 is a kind of mains by harmonics characteristic for obtaining the station containing new energy provided by the embodiments of the present application
Method flow schematic diagram is described in detail method provided by the present application below with reference to Fig. 1.
Step S101 establishes the node admittance matrix of Linear Network part.
For the power grid being only made of conventional steam turbine generator, transmission line of electricity, transformer, load etc., in engineering often
It is considered as Linear Network, by branch impedance matrix, the node admittance matrix etc. for establishing power grid, can be used for analyzing under harmonic source effect
The distribution situation of harmonic voltage in power grid.And for new energy unit, such as directly driven wind-powered, double-fed fan motor, photovoltaic power generation, all it is
It is grid-connected using this kind of quick control power electronic equipment of voltage converter.Such converter equipment has more significant non-
Linear character, and when power grid generation is disturbed, dynamic characteristic, which has the global response characteristic of power grid, to be significantly affected, because
This should not ignore its dynamic characteristic
Fig. 2 show the topological structure of typical directly driven wind-powered unit, by wind energy conversion system, synchronous generator, generator-side converter wear and
Its control system, grid-side converter and its control system, filter circuit composition, control section include the control system of two current transformers
System and other auxiliary controlling units.
Fig. 3 show the circuit topology and control principle of typical blower grid-side converter, and core is dq double -loop control ring
Section, the decoupling control for power of fan, electric current under dq coordinate；Additionally the Phase-Locked Synchronous link including network voltage, pulse
The controlling units such as width modulated (Pulse Width Modulation, PMW).
When analyzing the frequency response characteristic of new energy unit, linearization process, specific analysis method packet are generally required
Include: (1) transmission function is derived and is analyzed.According to the fundamental equation of circuit and control section, linearization process is done at operating point,
It finally derives equivalent impedance/form of admittance transmission function, and calculates its frequency response characteristic.(2) frequency scanning analysis.Base
In simulation model or field test condition, the low amplitude value harmonic current of different frequency is injected in power grid, obtains this microvariations
It is special to calculate input impedance/admittance frequency response for the voltage and current data of lower new energy unit port after being fourier transformed
Property.
For the power grid accessed comprising multiple new energy stations, joined according to the topology of Linear Network part, node and branch
Number, establishes the node admittance matrix of Linear Network；And according to the correlation of each branch impedance parameter and frequency, part section is obtained
The frequency response data of point admittance matrix, the admittance matrix are made of frequency response data, are specifically,
Wherein, whole loads in power grid are equivalent to node earth impedance branch；It is equivalent that all power is equivalent to Dai Weinan
The concatenated form of circuit form, i.e. ideal voltage source and equivalent impedance, and by all voltage source shorted to earths, by all current sources
It opens a way over the ground.
Step S102 obtains the frequency response data of the Equivalent admittance of new energy station by emulation or on-the-spot test, and
The supplement admittance matrix of the new energy station under different frequency is formed using the frequency response data.
If in k-th of node (total node number that 1≤k≤n, n are power grid), there are the accesses of new energy station, then using linear
Change analysis or frequency scanning method, the frequency response data of new energy station Equivalent admittance is obtained, with the frequency based on emulation
It is illustrated for rate scan method.Separate unit Wind turbines shown in Fig. 4 access in the simulation model of simple power grid, and injection is not
The forward-order current source of same frequency carries out simulation analysis.Based on simulation result, Wind turbines port electricity is obtained using Fourier transformation
Pressure, the amplitude and phase of respective frequencies component in electric current, and calculate according to formula (2) admittance value under the frequency.
In formulaIt indicates to flow into the harmonic component (phasor of the frequency component of angular frequency w) in the electric current of Wind turbines；Indicate the phasor of harmonic component in the electric current of inflow Wind turbines；Ykk" (jw) indicates the Equivalent admittance of Wind turbines at angle
Frequency is the value at w.It is analyzed by similar frequency scanning, the frequency response data of Wind turbines Equivalent admittance can be obtained, and
Corresponding supplement admittance matrix Y is formed according to formula (3)k″(jw)。
The supplement admittance matrix of each new energy station is included in Linear Network at different frequencies by step S103 respectively
Partial node admittance matrix forms the node admittance matrix of full electric network.
Combining step S101 and step S102's as a result, the supplement admittance matrix of each new energy station is included in line respectively
Property network portion node admittance matrix, the final node admittance matrix Y (jw) that full electric network is formed according to formula (4).Wherein k ∈ R
Indicate that k-th of node has the access of new energy station.
Step S104 obtains the harmonic wave distribution of full electric network under harmonic disturbance according to the node admittance matrix of the full electric network,
Assess the harmonic distortion and overvoltage risk of power grid.
The nodal voltage equation of full electric network such as formula (5), is abbreviated as YV=I.Wherein V is the sequence of whole node voltage compositions
Column, I are the sequence of whole node Injection Current compositions.
Consider that in a certain node m injection target frequency of power grid be wmHarmonic current source, phasor form isThe harmonic voltage that each node under harmonic source effect is calculated according to formula (6), to obtain full electric network
Harmonic wave distribution situation, assess the harmonic distortion and overvoltage risk of power grid.
V=Y-1I (6)
Corresponding with a kind of acquisition method of mains by harmonics characteristic of the station containing new energy provided by the present application, the application is same
When provide it is a kind of obtain the station containing new energy mains by harmonics characteristic device 500 characterized by comprising
Node admittance matrix establishes unit 510, establishes the node admittance matrix of Linear Network part；
Supplement admittance matrix establishes unit 520, and by simulation analysis or on-the-spot test, the equivalence for obtaining new energy station is led
The frequency response data received, and use the supplement admittance of the new energy station under frequency response data formation different frequency
Matrix；
The node admittance matrix of full electric network establishes unit 530, and at different frequencies, the supplement of each new energy station is led
Matrix of receiving is included in the node admittance matrix of Linear Network part respectively, forms the node admittance matrix of full electric network；
Assessment unit 540 obtains the harmonic wave point of full electric network under harmonic disturbance according to the node admittance matrix of the full electric network
Cloth assesses the harmonic distortion and overvoltage risk of power grid.
Method provided by the present application, by emulating or surveying the impedance operator of acquisition new energy station, by new energy station
Equivalent admittance is included in the node admittance matrix of full electric network, obtains the harmonic wave distribution of full electric network, assesses the harmonic distortion and mistake of power grid
Voltage risk meets the needs of to Harmonic characteristic analysis.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, although referring to above-described embodiment pair
The present invention is described in detail, those of ordinary skill in the art still can to a specific embodiment of the invention into
Row modifies perhaps equivalent replacement and these exist without departing from any modification of spirit and scope of the invention or equivalent replacement
Apply within pending claims of the invention.
Claims (6)
1. a kind of method for the mains by harmonics characteristic for obtaining the station containing new energy characterized by comprising
Establish the node admittance matrix of Linear Network part；
By simulation analysis or on-the-spot test, the frequency response data of the Equivalent admittance of new energy station is obtained, and described in use
Frequency response data forms the supplement admittance matrix of the new energy station under different frequency；
At different frequencies, the supplement admittance matrix of each new energy station is included in the node admittance of Linear Network part respectively
Matrix forms the node admittance matrix of full electric network；
According to the node admittance matrix of the full electric network, the harmonic wave distribution of full electric network under harmonic disturbance is obtained, the humorous of power grid is assessed
Wave distortion and overvoltage risk.
2. the method according to claim 1, wherein the node admittance matrix for establishing Linear Network part,
Include:
According to the topology of Linear Network part, node and branch parameters, the node admittance matrix of Linear Network is established；
The admittance matrix is made of frequency response data, is specifically,
3. the method according to claim 1, wherein obtaining new energy field by simulation analysis or on-the-spot test
The frequency response data for the Equivalent admittance stood, and the new energy station under different frequency is formed using the frequency response data
Supplement admittance matrix, comprising:
If then passing through simulation analysis there are the access of new energy station in k-th of node (total node number that 1≤k≤n, n are power grid)
Or on-the-spot test, obtain the frequency response data of new energy station Equivalent admittance；
The supplement admittance matrix that the admittance matrix is formed using the frequency response data is specifically,
4. the method according to claim 1, wherein the node admittance matrix of the full electric network, specifically are as follows:
Wherein k ∈ R indicates that k-th of node has the access of new energy station.
5. the method according to claim 1, wherein being obtained humorous according to the node admittance matrix of the full electric network
The harmonic wave distribution of full electric network, the harmonic distortion and overvoltage risk of assessment power grid are distributed by the harmonic wave under wave disturbance, comprising:
In the harmonic current source of a certain node injection target frequency of power grid；
According to the node admittance matrix of full electric network, the harmonic voltage that the harmonic wave acts on lower each node of power grid is calculated separately, in turn
The harmonic wave distribution for obtaining full electric network, the harmonic distortion and overvoltage risk of power grid are assessed by the harmonic voltage.
6. a kind of device for the mains by harmonics characteristic for obtaining the station containing new energy characterized by comprising
Node admittance matrix establishes unit, establishes the node admittance matrix of Linear Network part；
Supplement admittance matrix establishes unit, by simulation analysis or on-the-spot test, obtains the frequency of the Equivalent admittance of new energy station
Rate response data, and use the supplement admittance matrix of the new energy station under frequency response data formation different frequency；
The node admittance matrix of full electric network establishes unit, at different frequencies, by the supplement admittance matrix of each new energy station
It is included in the node admittance matrix of Linear Network part respectively, forms the node admittance matrix of full electric network；
Assessment unit obtains the harmonic wave distribution of full electric network under harmonic disturbance, assessment according to the node admittance matrix of the full electric network
The harmonic distortion and overvoltage risk of power grid.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110763920A (en) * | 2019-11-21 | 2020-02-07 | 国网四川省电力公司电力科学研究院 | System harmonic impedance estimation method and system based on minimum impedance and voltage norm |
| CN111077372A (en) * | 2019-12-24 | 2020-04-28 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and system for measuring harmonic impedance of alternating current-direct current power transmission system |
| CN111817317A (en) * | 2020-07-30 | 2020-10-23 | 四川大学 | Subsynchronous oscillation quantitative analysis method for wind power generation system with series compensation circuit |
| CN112444675A (en) * | 2020-12-14 | 2021-03-05 | 南方电网科学研究院有限责任公司 | Harmonic superstandard early warning method, device, equipment and medium for power transmission network nodes |
| CN112968470A (en) * | 2021-02-20 | 2021-06-15 | 中国电建集团华东勘测设计研究院有限公司 | Topological optimization method for offshore wind farm current collection system avoiding resonance region |
| CN114167133A (en) * | 2021-12-09 | 2022-03-11 | 广东电网有限责任公司 | Harmonic voltage evaluation method and device for newly-built station in power transmission network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110763920A (en) * | 2019-11-21 | 2020-02-07 | 国网四川省电力公司电力科学研究院 | System harmonic impedance estimation method and system based on minimum impedance and voltage norm |
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| CN111077372A (en) * | 2019-12-24 | 2020-04-28 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and system for measuring harmonic impedance of alternating current-direct current power transmission system |
| CN111817317A (en) * | 2020-07-30 | 2020-10-23 | 四川大学 | Subsynchronous oscillation quantitative analysis method for wind power generation system with series compensation circuit |
| CN112444675A (en) * | 2020-12-14 | 2021-03-05 | 南方电网科学研究院有限责任公司 | Harmonic superstandard early warning method, device, equipment and medium for power transmission network nodes |
| CN112968470A (en) * | 2021-02-20 | 2021-06-15 | 中国电建集团华东勘测设计研究院有限公司 | Topological optimization method for offshore wind farm current collection system avoiding resonance region |
| CN112968470B (en) * | 2021-02-20 | 2023-06-02 | 中国电建集团华东勘测设计研究院有限公司 | Topological optimization method for current collection system of offshore wind farm avoiding resonance area |
| CN114167133A (en) * | 2021-12-09 | 2022-03-11 | 广东电网有限责任公司 | Harmonic voltage evaluation method and device for newly-built station in power transmission network |
| CN114167133B (en) * | 2021-12-09 | 2023-06-16 | 广东电网有限责任公司 | Harmonic voltage evaluation method and device for newly built station in power transmission network |
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