CN110890769A - Method and system for determining frequency deviation of power system of new energy frequency modulation - Google Patents
Method and system for determining frequency deviation of power system of new energy frequency modulation Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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Abstract
The invention discloses a method and a system for determining frequency deviation of a power system of new energy frequency modulation, and belongs to the technical field of power system operation control. The method comprises the following steps: establishing a new energy generator single machine model and a synchronous generator single machine model according to the new energy power system; the new energy occupation ratio is determined according to the injection power of the single-machine model of the new energy generator to the bus, the injection electromagnetic power of the single-machine model of the synchronous generator to the bus and the electromagnetic power absorbed by the load of the power system; determining unbalanced power which can be balanced by the new energy single-machine model; determining the adjusting power of the balance unbalance power required to be provided by the synchronous generator single machine model; and determining the frequency deviation after the power fluctuation of the power system. The method can simplify the analysis and calculation difficulty while ensuring the accuracy of the calculation result, has higher engineering applicability, and can effectively ensure the safe and stable operation of the power grid.
Description
Technical Field
The present invention relates to the field of power system operation control technology, and more particularly, to a method and system for determining a power system frequency deviation of a new energy frequency modulation.
Background
The energy crisis makes people pay more and more attention to research and utilization of new energy, and new energy power generation is a main way of utilizing new energy. The new energy generator set is different from the traditional synchronous generator set, and due to the addition of a converter control link, electromechanical decoupling is realized, and the stability characteristic of the new energy generator set is changed. The new energy power generation proportion of China is gradually increasing and will continue to increase. After the large-scale new energy power generation replaces the traditional synchronous machine set to generate power, the frequency stability characteristic of a power system can be changed. After the power generation proportion of the new energy is improved, the transient supporting capability of the system to the frequency is weakened, the steady-state adjusting capability is reduced, and the essential reason is that the frequency stability problem is prominent because the inertia level and the frequency modulation capacity of the power grid are relatively reduced. With the continuous improvement of the proportion of new energy, the system needs the new energy to have certain frequency modulation capability. In response to the demand, manufacturers of new energy units have been producing new energy units with certain frequency modulation capability.
The power system is a typical high-order nonlinear system, and after a detailed mathematical model of each model is established, a full-state time domain simulation method can be used for carrying out numerical solution, so that the frequency dynamic response characteristic of the system can be comprehensively obtained. However, the full-state time domain simulation method has a large calculation amount and is generally only suitable for offline analysis. The existing method realizes the rapid calculation of the steady-state frequency of the power system after disturbance, but the existing method does not consider the influence of the access of new energy power generation on the calculation of the steady-state frequency, does not consider the influence of the new energy participating in system frequency modulation on the calculation of the steady-state frequency, and cannot deal with and solve the practical problems that the new energy power generation accounts for more and the frequency is stable and more prominent in China.
Disclosure of Invention
In view of the above problem, the present invention provides a method for determining a frequency deviation of a power system for new energy frequency modulation, where the method includes:
establishing a new energy generator single machine model and a synchronous generator single machine model according to the new energy power system;
injecting power P into bus by using single-machine model of new energy generatorr；
The single-machine model of the synchronous generator injects electromagnetic power P into the buss；
Determining the load absorption electromagnetic power of the new energy power system as PLAccording to PL、PrAnd PsDetermining the new energy ratio as k;
when the bus is injected with electromagnetic power in real time balance and in steady state, P is determineds+Pr＝PL；
When the load absorbs the electromagnetic power with the variable quantity of delta P, the delta P is α PLThe maximum amount of generated power which can be used for compensating the unbalanced power by the new energy source is β times, and the generated power is notEquilibrium power is α<Determining unbalanced power delta P of new energy single-machine model when 0 time is up1；
Unbalanced power delta P when new energy single machine model is balanced1In case of not satisfying the unbalanced power to be compensated, according to Δ P1Determining the regulated power α P of the unbalanced-balanced power that needs to be provided by the synchronous generator stand-alone modelL-ΔP1＝(α+βk)PL；
According to regulated power α PL-ΔP1＝(α+βk)PLAnd determining and changing the rotor rotating speed omega of the single machine model of the synchronous generator, and determining the frequency deviation after the power fluctuation of the power system according to the rotor rotating speed omega.
Optionally, according to Δ P1Determining and changing the rotor rotating speed omega of a single machine model of the synchronous generator, and determining the frequency deviation after power fluctuation of the power system according to the rotor rotating speed omega, wherein the method specifically comprises the following steps:
after the single machine model of the synchronous generator adjusts the mechanical power of the single machine system model, the mechanical power change rate of the single machine model of the synchronous generator after determining that the single machine system model has power fluctuation is as follows:
according to the mechanical power change rate of the single-machine model of the synchronous generator, the change rate of the rotating speed of the rotor is determined as follows:
Δω(％)＝-σΔPT(％)
wherein, sigma is the difference adjustment coefficient of the speed regulator of the single-machine model of the synchronous generator;
the rotor speed ω after the power fluctuation of the power system is:
determining the frequency deviation after the power fluctuation of the power system according to the rotor rotating speed omega as follows:
optionally, the new energy ratio k of the power system is such that the load of the power system absorbs the electromagnetic power PLAs reference values, the following formula is determined:
Pr＝kPL
Ps＝(1-k)PL。
optionally, the value of the difference adjustment coefficient σ of the speed regulator of the single-machine model of the synchronous generator is between 0.04 and 0.05.
The invention also provides a system for determining the frequency deviation of the power system of the new energy frequency modulation, which comprises the following steps:
the synchronization module is used for establishing a new energy generator single machine model and a synchronous generator single machine model according to the new energy power system;
injecting power P into bus by using single-machine model of new energy generatorr；
The single-machine model of the synchronous generator injects electromagnetic power P into the buss；
A first parameter determination module for determining the electromagnetic power absorbed by the load of the power system as PLAccording to PL、PrAnd PsDetermining a new energy ratio k;
a second parameter determination module for determining a second parameter,
determining P when the bus injected electromagnetic power is balanced in real time and in a steady states+Pr＝PL；
When the load absorbs the electromagnetic power with the variable quantity of delta P, the delta P is α PLThe maximum generated power of the new energy source capable of providing the compensation unbalanced power is β times, and the unbalanced power is α<Determining unbalanced power delta P of new energy single-machine model when 0 time is up1；
A third parameter determining module for determining the unbalanced power delta P when the new energy single-machine model is balanced1In case of not satisfying the unbalanced power to be compensated, according to Δ P1Determining the regulated power α P of the unbalanced-balanced power that needs to be provided by the synchronous generator stand-alone modelL-ΔP1＝(α+βk)PL；
A fourth parameter determination module for determining the power α P according to the adjusted powerL-ΔP1＝(α+βk)PLAnd determining and changing the rotor rotating speed omega of the single machine model of the synchronous generator, and determining the frequency deviation after the power fluctuation of the power system according to the rotor rotating speed omega.
Optionally, the fourth parameter determining module is configured to determine the parameter according to Δ P1Determining and changing the rotor rotating speed omega of a single machine model of the synchronous generator, and determining the frequency deviation after power fluctuation of the power system according to the rotor rotating speed omega, wherein the method specifically comprises the following steps:
after the single machine model of the synchronous generator adjusts the mechanical power of the single machine system model, the mechanical power change rate of the single machine model of the synchronous generator after determining that the single machine system model has power fluctuation is as follows:
according to the mechanical power change rate of the single-machine model of the synchronous generator, the change rate of the rotating speed of the rotor is determined as follows:
Δω(％)＝-σΔPT(％)
wherein, sigma is the difference adjustment coefficient of the speed regulator of the single-machine model of the synchronous generator;
the rotor speed ω after the power fluctuation of the power system is:
determining the frequency deviation after the power fluctuation of the power system according to the rotor rotating speed omega as follows:
optionally, the new energy ratio k of the power system is such that the load of the power system absorbs the electromagnetic power PLAs reference values, the following formula is determined:
Pr＝kPL
Ps＝(1-k)PL。
optionally, the value of the difference adjustment coefficient σ of the speed regulator of the single-machine model of the synchronous generator is between 0.04 and 0.05.
The invention provides a method for calculating the steady-state frequency deviation value of a power system under unbalanced power after large-scale new energy power generation with frequency modulation capability is accessed, and the method can be used for analyzing and operating an actual power grid;
the method can simplify the analysis and calculation difficulty while ensuring the accuracy of the calculation result, has higher engineering applicability, and can effectively ensure the safe and stable operation of the power grid.
Drawings
FIG. 1 is a flow chart of a method for determining a frequency deviation of a power system for new energy frequency modulation according to the present invention;
FIG. 2 is a diagram of a new energy single machine model of a method for determining a frequency deviation of a power system for frequency modulation of new energy according to the present invention;
fig. 3 is a system diagram of determining a frequency deviation of a power system for new energy frequency modulation according to the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a method for determining frequency deviation of a power system of new energy frequency modulation, as shown in fig. 1, the method comprises the following steps:
based on an inertia center concept, aggregating synchronous generators in a researched system into a single-machine model, and establishing a single-machine model of a new energy generator and a single-machine model of a synchronous generator according to a new energy power system as shown in FIG. 2;
gr represents a new energy generator single machine model obtained by approximately aggregating all new energy power generation, and the new energy generator single machine model injects power P into the busrGs is a single-machine model of the synchronous generator, and the single-machine model of the synchronous generator injects electromagnetic power P into the buss；
Defining the electromagnetic power absorbed by the load of the power system as PLAccording to PL、PrAnd PsDetermining the new energy ratio as k;
the new energy of the power system accounts for k, and the load of the power system absorbs the electromagnetic power PLAs reference values, the following formula is determined:
Pr＝kPL
Ps＝(1-k)PL。
determining P when the bus injected electromagnetic power is balanced in real time and in a steady states+Pr＝PL；
When the load absorbs the electromagnetic power with the variable quantity of delta P, the delta P is α PLThe maximum generated power of the new energy source capable of providing the compensation unbalanced power is β times, and the unbalanced power is α<Determining unbalanced power delta P of new energy single-machine model when 0 time is up1；
ΔP1＝-βkPL
Unbalanced power delta P when new energy single machine model is balanced1In case of not satisfying the unbalanced power to be compensated, according to Δ P1Determining the regulated power α P of the unbalanced-balanced power that needs to be provided by the synchronous generator stand-alone modelL-ΔP1＝(α+βk)PL；
According to regulated power α PL-ΔP1＝(α+βk)PLDetermining and changing the rotor rotation speed omega of the single-machine model of the synchronous generator, and determining according to the rotor rotation speed omegaThe frequency deviation after power fluctuation of the power system specifically comprises the following steps:
after the single machine model of the synchronous generator adjusts the mechanical power of the single machine system model, the mechanical power change rate of the single machine model of the synchronous generator after determining that the single machine system model has power fluctuation is as follows:
according to the mechanical power change rate of the single-machine model of the synchronous generator, the change rate of the rotating speed of the rotor is determined as follows:
Δω(％)＝-σΔPT(％)
wherein, sigma is the difference adjustment coefficient of the speed regulator of the single-machine model of the synchronous generator;
the rotor speed ω after the power fluctuation of the power system is:
determining the frequency deviation after the power fluctuation of the power system according to the rotor rotating speed omega as follows:
and the value of the difference adjusting coefficient sigma of the single-machine model speed regulator of the synchronous generator is between 0.04 and 0.05.
The present invention further provides a system 200 for determining a frequency deviation of a power system for new energy frequency modulation, as shown in fig. 3, comprising:
the synchronization module 201 is used for establishing a new energy generator single machine model and a synchronous generator single machine model according to a new energy power system;
injecting power P into bus by using single-machine model of new energy generatorr；
The single-machine model of the synchronous generator injects electromagnetic power P into the buss；
The first parameter determination module 202 determines the electromagnetic power absorbed by the load of the power system as PLAccording to PL、PrAnd PsDetermining the new energy ratio as k;
the new energy of the power system accounts for k, and the load of the power system absorbs the electromagnetic power PLAs reference values, the following formula is determined:
Pr＝kPL
Ps＝(1-k)PL。
the second parameter determining module 203 determines P when the bus injected electromagnetic power is balanced in real time and is in a steady states+Pr＝PL；
When the load absorbs the electromagnetic power with the variable quantity of delta P, the delta P is α PLThe maximum generated power of the new energy source capable of providing the compensation unbalanced power is β times, and the unbalanced power is α<Determining unbalanced power delta P of new energy single-machine model when 0 time is up1；
ΔP1＝-βkPL
The third parameter determining module 204 determines the unbalanced power Δ P when the new energy single machine model is balanced1In case of not satisfying the unbalanced power to be compensated, according to Δ P1Determining the regulated power α P of the unbalanced-balanced power that needs to be provided by the synchronous generator stand-alone modelL-ΔP1＝(α+βk)PL；
A fourth parameter determination module 205 for determining the power α P based on the adjusted powerL-ΔP1＝(α+βk)PLDetermining and changing the rotor rotating speed omega of a single machine model of the synchronous generator, and determining the frequency deviation after power fluctuation of the power system according to the rotor rotating speed omega, wherein the method specifically comprises the following steps:
after the single machine model of the synchronous generator adjusts the mechanical power of the single machine system model, the mechanical power change rate of the single machine model of the synchronous generator after determining that the single machine system model has power fluctuation is as follows:
according to the mechanical power change rate of the single-machine model of the synchronous generator, the change rate of the rotating speed of the rotor is determined as follows:
Δω(％)＝-σΔPT(％)
wherein, sigma is the difference adjustment coefficient of the speed regulator of the single-machine model of the synchronous generator;
the rotor speed ω after the power fluctuation of the power system is:
determining the frequency deviation after the power fluctuation of the power system according to the rotor rotating speed omega as follows:
and the value of the difference adjusting coefficient sigma of the single-machine model speed regulator of the synchronous generator is between 0.04 and 0.05.
The invention provides a method for calculating the steady-state frequency deviation value of a power system under unbalanced power after large-scale new energy power generation access with frequency modulation capability, which can be used for analysis and operation of an actual power grid.
The method can simplify the analysis and calculation difficulty while ensuring the accuracy of the calculation result, has higher engineering applicability, and can effectively ensure the safe and stable operation of the power grid.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (8)
1. A method of determining a power system frequency deviation for new energy frequency modulation, the method comprising:
establishing a new energy generator single machine model and a synchronous generator single machine model according to the new energy power system;
injecting power P into bus by using single-machine model of new energy generatorr；
The single-machine model of the synchronous generator injects electromagnetic power P into the buss；
Determining the load absorption electromagnetic power of the new energy power system as PLAccording to PL、PrAnd PsDetermining the new energy ratio as k;
when the bus is injected with electromagnetic power in real time balance and in steady state, P is determineds+Pr＝PL；
When the load absorbs the electromagnetic power with the variable quantity of delta P, the delta P is α PLThe maximum generated power which can provide the amount of compensation unbalanced power is β times, and the unbalanced power delta P of the new energy single-machine model is determined when the unbalanced power is α < 01；
Unbalanced power delta P when new energy single machine model is balanced1In case of not satisfying the unbalanced power to be compensated, according to Δ P1Determining the regulated power α P of the unbalanced-balanced power that needs to be provided by the synchronous generator stand-alone modelL-ΔP1＝(α+βk)PL；
According to regulated power α PL-ΔP1＝(α+βk)PLAnd determining and changing the rotor rotating speed omega of the single machine model of the synchronous generator, and determining the frequency deviation after the power fluctuation of the power system according to the rotor rotating speed omega.
2. The method of claim 1, said according to Δ Ρ1Determining and changing the rotor rotating speed omega of a single machine model of the synchronous generator, and determining the frequency deviation after power fluctuation of the power system according to the rotor rotating speed omega, wherein the method specifically comprises the following steps:
after the single machine model of the synchronous generator adjusts the mechanical power of the single machine system model, the mechanical power change rate of the single machine model of the synchronous generator after determining that the single machine system model has power fluctuation is as follows:
according to the mechanical power change rate of the single-machine model of the synchronous generator, the change rate of the rotating speed of the rotor is determined as follows:
Δω(％)＝-σΔPT(％)
wherein, sigma is the difference adjustment coefficient of the speed regulator of the single-machine model of the synchronous generator;
the rotor speed ω after the power fluctuation of the power system is:
determining the frequency deviation after the power fluctuation of the power system according to the rotor rotating speed omega as follows:
3. the method of claim 1, wherein the new energy fraction k of the power system is such that the power system load absorbs the electromagnetic power PLAs reference values, the following formula is determined:
Pr＝kPL
Ps＝(1-k)PL。
4. the method of claim 1, wherein the difference coefficient σ of the speed regulator of the stand-alone model of the synchronous generator is between 0.04 and 0.05.
5. A system for determining a power system frequency deviation for new energy frequency modulation, the system comprising:
the synchronization module is used for establishing a new energy generator single machine model and a synchronous generator single machine model according to the new energy power system;
injecting power P into bus by using single-machine model of new energy generatorr；
The single-machine model of the synchronous generator injects electromagnetic power P into the buss；
First parameterA determination module for determining the electromagnetic power absorbed by the load of the power system as PLAccording to PL、PrAnd PsDetermining a new energy ratio k;
a second parameter determination module for determining a second parameter,
determining P when the bus injected electromagnetic power is balanced in real time and in a steady states+Pr＝PL；
When the load absorbs the electromagnetic power with the variable quantity of delta P, the delta P is α PLThe maximum generated power which can provide the compensation unbalanced power is β times, and the unbalanced power delta P1 balanced by the new energy single-machine model is determined when the unbalanced power is α < 0;
a third parameter determining module for determining the unbalanced power delta P when the new energy single-machine model is balanced1When the unbalanced power required to be compensated cannot be met, determining the regulated power α P of the balanced unbalanced power required to be provided by the single-machine model of the synchronous generator according to the delta P1L-ΔP1＝(α+βk)PL；
A fourth parameter determination module for determining the power α P according to the adjusted powerL-ΔP1＝(α+βk)PLAnd determining and changing the rotor rotating speed omega of the single machine model of the synchronous generator, and determining the frequency deviation after the power fluctuation of the power system according to the rotor rotating speed omega.
6. The system of claim 5, wherein the fourth parameter determining module is configured to determine the parameter based on Δ P1Determining and changing the rotor rotating speed omega of a single machine model of the synchronous generator, and determining the frequency deviation after power fluctuation of the power system according to the rotor rotating speed omega, wherein the method specifically comprises the following steps:
after the single machine model of the synchronous generator adjusts the mechanical power of the single machine system model, the mechanical power change rate of the single machine model of the synchronous generator after determining that the single machine system model has power fluctuation is as follows:
according to the mechanical power change rate of the single-machine model of the synchronous generator, the change rate of the rotating speed of the rotor is determined as follows:
Δω(％)＝-σΔPT(％)
wherein, sigma is the difference adjustment coefficient of the speed regulator of the single-machine model of the synchronous generator;
the rotor speed ω after the power fluctuation of the power system is:
determining the frequency deviation after the power fluctuation of the power system according to the rotor rotating speed omega as follows:
7. the system of claim 5, wherein the new energy fraction k of the power system is determined by taking the electromagnetic power PL absorbed by the load of the power system as a reference value according to the following formula:
Pr＝kPL
Ps＝(1-k)PL。
8. the system of claim 5, wherein the difference coefficient σ of the speed regulator of the stand-alone model of the synchronous generator is between 0.04 and 0.05.
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