CN109103871A - The direct-current grid method for analyzing stability more disturbed based on honourable lotus - Google Patents
The direct-current grid method for analyzing stability more disturbed based on honourable lotus Download PDFInfo
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- CN109103871A CN109103871A CN201811148185.5A CN201811148185A CN109103871A CN 109103871 A CN109103871 A CN 109103871A CN 201811148185 A CN201811148185 A CN 201811148185A CN 109103871 A CN109103871 A CN 109103871A
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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Abstract
The present invention discloses a kind of direct-current grid method for analyzing stability more disturbed based on honourable lotus comprising following steps: constructs the stochastic model of DC micro power grid system: obtaining expectation and the characteristic root of variance and the state equation of the DC micro power grid system of the solution, stochastic variable of the stochastic model；Judge when the time, t tended to infinity, whether the real part of bounded and the characteristic root is respectively less than 0 for the expectation of the stochastic variable and variance, if so, the DC micro power grid system is Stochastic stable.The present invention is using the various enchancement factors in direct-current grid as stochastic variable, pass through the basic theories of stochastic differential equation, establish the stochastic model of the direct-current grid of the random process comprising all kinds, the random perturbation problem in direct-current grid can be more really reacted, the accuracy of direct-current grid stability analysis is improved.
Description
Technical field
The present invention relates to electrical network fields, specifically, the present invention relates to a kind of DC micro-electrics more disturbed based on honourable lotus
Net method for analyzing stability.
Background technique
For the unstable problem of direct-current grid, many scholars never be unfolded in face of the stability of direct-current grid by Tongfang
Systematic analysis, specifically includes that
Using small-signal analysis method, the direct-current grid small-signal model under different control strategies is established, its impedance is analyzed
Model analyzes the resonance caused by system interconnects；
Using large-signal analysis, establish the big signal stabilization model of direct-current grid, to constant power load, route and
Resonance caused by filtering parameter is analyzed.
But it is micro- to direct current not can solve the random perturbations such as the fluctuation of power supply unit output power, the fluctuation of random load
Stochastic volatility problem caused by power grid.
Summary of the invention
Direct-current grid is made in order to solve the random perturbations such as the fluctuation of power supply unit output power, the fluctuation of random load
At stochastic volatility problem, the present invention provides it is a kind of based on honourable lotus more disturb direct-current grid stability analysis side
Method.
To achieve the above object, a kind of direct-current grid method for analyzing stability packet more disturbed based on honourable lotus of the present invention
Include following steps:
Step S101: the stochastic model of DC micro power grid system is constructed:
Wherein, z indicates the acquisition parameter in DC micro power grid system,Indicate the deterministic models of z, β (z, t, W
(t)) stochastic variable introduced is indicated, W (t) is white Gaussian noise process, and t is the time；
Step S103: the expectation and variance and the direct-current grid of the solution, stochastic variable of the stochastic model are obtained
The characteristic root of the state equation of system；
Step S105: judging when the time, t tended to infinity, the expectation of the stochastic variable and variance whether bounded and institute
Whether the real part for stating characteristic root is respectively less than 0, if so, the DC micro power grid system is Stochastic stable.
Preferably, the direct-current grid method for analyzing stability more disturbed based on honourable lotus further includes following steps:
If it is not, then the DC micro power grid system is unstable.
Preferably, the step S101 includes the following steps:
It obtains and classifies acquisition parameter according to preset rules, wherein the classification of acquisition parameter includes that state variable and parameter become
Amount；
Classification based on the acquisition parameter and the acquisition parameter constructs the stochastic model of the DC micro power grid system.
Preferably, the acquisition parameter include the revolving speed of blower, generator rotor angle, rotational speed difference, photovoltaic active power of output and
Load active power, the preset rules are that the revolving speed of the blower, generator rotor angle, rotational speed difference are divided to state variable, will be described
The active power of output of photovoltaic, load active power are divided to parametric variable.
Preferably, the stochastic model of the DC micro power grid system includes wind-powered electricity generation stochastic model, described to be based on the acquisition
The stochastic model that the classification of parameter and the acquisition parameter constructs the DC micro power grid system includes the following steps:
Revolving speed, generator rotor angle, rotational speed difference and state variable based on blower construct wind-powered electricity generation stochastic model, wherein when acquisition is joined
When number z is state variable x, stochastic model is
In formula:
Indicate the dynamic process of state variable x,
φ (x, t) indicates the motion profile of state variable x,
Indicate the dynamic process of stochastic variable β,
A (x, β, t) indicates the dynamic behaviour of stochastic variable,
The statistical property of b (x, β, t) expression stochastic variable.
Preferably, the stochastic model of the DC micro power grid system includes photovoltaic stochastic model and Stochastic Load Model, institute
Stating the classification based on the acquisition parameter and the acquisition parameter and constructing the stochastic model of the DC micro power grid system includes such as
Lower step:
Active power of output and parametric variable based on photovoltaic construct photovoltaic stochastic model；
Stochastic Load Model is constructed based on load active power and parametric variable, wherein when acquisition parameter z is that parameter is normal
When measuring p, stochastic model is
P (t)=p0+β(p,t,W(t))
In formula:
Indicate the dynamic process of stochastic variable β,
A (p, β, t) indicates the dynamic behaviour of stochastic variable,
The statistical property of b (p, β, t) expression stochastic variable.
Compared with prior art, a kind of direct-current grid method for analyzing stability tool more disturbed based on honourable lotus of the present invention
It has the advantages that:
A kind of direct-current grid method for analyzing stability more disturbed based on honourable lotus of the present invention will be in direct-current grid
Various enchancement factors are established by the basic theories of stochastic differential equation comprising the random of all kinds as stochastic variable
The stochastic model of the direct-current grid of process, and the direct-current grid stochastic model based on stochastic differential equation can be more true
Reaction direct-current grid in random perturbation problem, thus, it is possible to the stable characters of more accurate analysis direct-current grid
Condition overcomes the feature not accurate enough by deterministic models analysis direct-current grid stability, improves direct-current grid analysis of stability
The accuracy of analysis.
The additional aspect of the present invention and advantage will be set forth in part in the description, these will become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is a kind of method of the direct-current grid method for analyzing stability more disturbed based on honourable lotus of the embodiment of the present invention
Flow diagram.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
Referring to Fig. 1, a kind of direct-current grid method for analyzing stability more disturbed based on honourable lotus of the embodiment of the present invention,
It includes the following steps:
Step S101: the stochastic model of DC micro power grid system is constructed:
Wherein, z indicates the acquisition parameter in DC micro power grid system,Indicate the deterministic models of z, β (z, t, W
(t)) stochastic variable introduced is indicated, W (t) is white Gaussian noise process, and t is the time.
Specifically, step S101 includes the following steps:
It obtains and classifies acquisition parameter according to preset rules, wherein the classification of acquisition parameter includes that state variable and parameter become
Amount；
Stochastic model based on the classification of acquisition parameter and acquisition parameter building DC micro power grid system.
Preferably, acquisition parameter includes the active power of output and load of the revolving speed of blower, generator rotor angle, rotational speed difference, photovoltaic
Active power, preset rules are that the revolving speed of blower, generator rotor angle, rotational speed difference are divided to state variable, by the output wattful power of photovoltaic
Rate, load active power are divided to parametric variable.
In some embodiments, the stochastic model of DC micro power grid system includes wind-powered electricity generation stochastic model, then based on acquisition
The stochastic model of the classification of parameter and acquisition parameter building DC micro power grid system includes the following steps:
Revolving speed, generator rotor angle, rotational speed difference and state variable based on blower construct wind-powered electricity generation stochastic model, wherein when acquisition is joined
When number z is state variable x, stochastic model is
In formula:
Indicate the dynamic process of state variable x,
φ (x, t) indicates the motion profile of state variable x,
Indicate the dynamic process of stochastic variable β,
A (x, β, t) indicates the dynamic behaviour of stochastic variable,
The statistical property of b (x, β, t) expression stochastic variable.
In some embodiments, the stochastic model of DC micro power grid system further includes that photovoltaic stochastic model and load are random
Model, the then stochastic model based on the classification of acquisition parameter and acquisition parameter building DC micro power grid system include the following steps:
Active power of output and parametric variable based on photovoltaic construct photovoltaic stochastic model；
Stochastic Load Model is constructed based on load active power and parametric variable, wherein when acquisition parameter z is that parameter is normal
When measuring p, stochastic model is
P (t)=p0+β(p,t,W(t))
In formula:
Indicate the dynamic process of stochastic variable β,
A (p, β, t) indicates the dynamic behaviour of stochastic variable,
The statistical property of b (p, β, t) expression stochastic variable.
Step S103: the expectation and variance and the direct-current grid of the solution, stochastic variable of the stochastic model are obtained
The characteristic root of the state equation of system.
Preferably, step S103 is solved using numerical value software for calculation.
Step S105: judging when the time, t tended to infinity, the expectation of the stochastic variable and variance whether bounded and institute
Whether the real part for stating characteristic root is respectively less than 0, if so, the DC micro power grid system is Stochastic stable.
It is understood that if when time t tends to infinity, the expectation of stochastic variable and variance is unbounded or characteristic root
Real part is greater than 0, then DC micro power grid system is unstable.
Compared with prior art, a kind of direct-current grid stability analysis more disturbed based on honourable lotus of the embodiment of the present invention
Method has the following beneficial effects:
A kind of direct-current grid method for analyzing stability more disturbed based on honourable lotus of the embodiment of the present invention is by DC micro-electric
Various enchancement factors in net are established by the basic theories of stochastic differential equation comprising all kinds as stochastic variable
Random process direct-current grid stochastic model, and the direct-current grid stochastic model based on stochastic differential equation can be more
Add the random perturbation problem in true reaction direct-current grid, thus, it is possible to the stabilizations of more accurate analysis direct-current grid
Character condition overcomes the feature not accurate enough by deterministic models analysis direct-current grid stability, improves direct-current grid and stablize
Property analysis accuracy.
The above is only some embodiments of the invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of direct-current grid method for analyzing stability more disturbed based on honourable lotus, which is characterized in that described based on scene
The direct-current grid method for analyzing stability that lotus disturbs more includes the following steps:
Step S101: the stochastic model of DC micro power grid system is constructed:
Wherein, z indicates the acquisition parameter in DC micro power grid system,Indicate the deterministic models of z, β (z, t, W (t))
Indicate the stochastic variable introduced, W (t) is white Gaussian noise process, and t is the time；
Step S103: expectation and variance and the DC micro power grid system of the solution, stochastic variable of the stochastic model are obtained
State equation characteristic root；
Step S105: judging when the time, t tended to infinity, the expectation of the stochastic variable and variance whether bounded and the spy
Whether the real part for levying root is respectively less than 0, if so, the DC micro power grid system is Stochastic stable.
2. the direct-current grid method for analyzing stability more disturbed based on honourable lotus as described in claim 1, which is characterized in that
The direct-current grid method for analyzing stability more disturbed based on honourable lotus further includes following steps:
If it is not, then the DC micro power grid system is unstable.
3. the direct-current grid method for analyzing stability more disturbed based on honourable lotus as described in claim 1, which is characterized in that
The step S101 includes the following steps:
Obtain and according to preset rules classify acquisition parameter, wherein the classification of acquisition parameter includes state variable and parametric variable；
Classification based on the acquisition parameter and the acquisition parameter constructs the stochastic model of the DC micro power grid system.
4. the direct-current grid method for analyzing stability more disturbed based on honourable lotus as claimed in claim 3, which is characterized in that
The acquisition parameter includes revolving speed, generator rotor angle, rotational speed difference, the active power of output of photovoltaic and the load active power of blower, institute
Stating preset rules is that the revolving speed of the blower, generator rotor angle, rotational speed difference are divided to state variable, by the output wattful power of the photovoltaic
Rate, load active power are divided to parametric variable.
5. the direct-current grid method for analyzing stability more disturbed based on honourable lotus as claimed in claim 4, which is characterized in that
The stochastic model of the DC micro power grid system includes wind-powered electricity generation stochastic model, described to be joined based on the acquisition parameter and the acquisition
The stochastic model that several classifications constructs the DC micro power grid system includes the following steps:
Revolving speed, generator rotor angle, rotational speed difference and state variable based on blower construct wind-powered electricity generation stochastic model, wherein when acquisition parameter z is
When state variable x, stochastic model is
In formula:
Indicate the dynamic process of state variable x,
φ (x, t) indicates the motion profile of state variable x,
Indicate the dynamic process of stochastic variable β,
A (x, β, t) indicates the dynamic behaviour of stochastic variable,
The statistical property of b (x, β, t) expression stochastic variable.
6. the direct-current grid method for analyzing stability more disturbed based on honourable lotus as claimed in claim 4, which is characterized in that
The stochastic model of the DC micro power grid system includes photovoltaic stochastic model and Stochastic Load Model, described based on acquisition ginseng
The stochastic model that several and the acquisition parameter classification constructs the DC micro power grid system includes the following steps:
Active power of output and parametric variable based on photovoltaic construct photovoltaic stochastic model；
Stochastic Load Model is constructed based on load active power and parametric variable, wherein when acquisition parameter z is constants p
When, stochastic model is
P (t)=p0+β(p,t,W(t))
In formula:
Indicate the dynamic process of stochastic variable β,
A (p, β, t) indicates the dynamic behaviour of stochastic variable,
The statistical property of b (p, β, t) expression stochastic variable.
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| CN112993969A (en) * | 2021-04-30 | 2021-06-18 | 安徽工业大学 | Large signal stability analysis method for direct-current micro-grid cluster |
| CN118036225A (en) * | 2024-01-26 | 2024-05-14 | 国网湖北省电力有限公司电力科学研究院 | DC micro-grid topological structure model selection method based on stability analysis |
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