CN115842366A - Method and system for real-time discrimination of static state of high-proportion new energy power system - Google Patents
Method and system for real-time discrimination of static state of high-proportion new energy power system Download PDFInfo
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Abstract
The invention discloses a method and a system for distinguishing a steady state of a high-proportion new energy power system in real time, and belongs to the technical field of voltage stability analysis. The method comprises the following steps: determining a real-time monitoring index for static voltage stability analysis of the high-proportion new energy power system; determining a real-time judgment index representing the static voltage stability critical stable state of the high-proportion new energy power system; obtaining a real-time margin index for static voltage stability analysis of the high-proportion new energy power system based on the real-time monitoring index and the real-time distinguishing index; and judging whether the high-proportion new energy power system is in a static limit state or not. The method can effectively carry out real-time quantitative evaluation on the voltage stability of the high-proportion new energy power system, monitor the running state of the system voltage and ensure the safe and stable running of the high-proportion new energy power system.
Description
Technical Field
The invention relates to the technical field of voltage stability analysis of a high-proportion new energy power system, in particular to a method and a system for distinguishing a static state of the high-proportion new energy power system in real time.
Background
As the most mature and promising renewable energy source at present, the wind power generation and photovoltaic power generation which are connected with the grid through a converter keep a strong development trend in recent years, the traditional excitation regulation mechanism for supporting reactive voltage is obviously weakened, the voltage support strength of the system is weakened, and the static voltage stability of the system is influenced.
For the real-time monitoring of the static voltage stability of the high-proportion new energy power system, on one hand, the current state indexes of stability analysis are mostly based on off-line data, and real-time measurement is difficult to realize; on the other hand, the margin indexes have diversity, and the accuracy of the analysis result can be ensured only by matching the state indexes with the margin indexes.
Disclosure of Invention
Aiming at the problems, the invention provides a method for distinguishing the static and stable state of a high-proportion new energy power system in real time, which comprises the following steps:
acquiring operation parameters of a high-proportion new energy power system, and determining a real-time monitoring index for static voltage stability analysis of the high-proportion new energy power system based on the operation parameters;
determining a real-time judgment index representing the stable critical stable state of the static voltage of the high-proportion new energy power system based on the operation parameters;
obtaining a real-time margin index for static voltage stability analysis of the high-proportion new energy power system based on the real-time monitoring index and the real-time distinguishing index;
and judging whether the high-proportion new energy power system is in a static stability limit state or not according to the real-time margin index and a preset margin quantization standard for static voltage stability analysis of the high-proportion new energy power system.
Optionally, determining a real-time monitoring index for static voltage stability analysis of the high-proportion new energy power system based on the operation parameter includes:
based on the operation parameters, establishing an equivalence analysis model of the high-proportion new energy power system, wherein the equivalence analysis model comprises the following steps:
wherein the content of the first and second substances,
for a system thevenin equivalent potential, is>
For real-time operating voltage, Z, of new energy grid-connected node i i Is the equivalent impedance of the system thevenin @>
The equivalent current flowing into the system for node i;
according to the equivalence analysis model, establishing a real-time monitoring index for static voltage stability analysis of the high-proportion new energy power system, wherein the real-time monitoring index comprises the following steps:
wherein, RTSSI i For real-time monitoring index, subscript P is per unit system with nominal voltage as reference voltage, subscript i is node number,
for a system thevenin equivalent potential, is>
And the real-time operation voltage of the new energy grid-connected node i is obtained.
Optionally, the real-time criterion is as follows:
wherein, the RTCSSI i For real-time discrimination of the index, U P,i Real-time operation voltage for new energy grid-connected node i
The amplitude of (c).
Optionally, the real-time margin index is as follows:
RTΔ i ＝RTSSI i -RTCSSI i
wherein, RT.DELTA. i RTSSI as a real-time margin indicator i For monitoring the indicators in real time, RTCSI i Is a real-time discrimination index.
Optionally, the margin quantization standard is preset as follows:
if the real-time margin index RT delta i If the value of the new energy is greater than 0, determining that the high-proportion new energy power system is in a stable state;
if the real-time margin index RT delta i If the value of the voltage is equal to 0, determining that the high-proportion new energy power system is in a static voltage critical stable state;
if the real-time margin index RT delta i If the value of (1) is less than 0, determining that the high-proportion new energy power system is in a destabilization state.
On the other hand, the invention also provides a system for distinguishing the static state of the high-proportion new energy power system in real time, which comprises the following steps:
the system comprises a first calculation unit, a second calculation unit and a third calculation unit, wherein the first calculation unit is used for acquiring operation parameters of a high-proportion new energy power system and determining a real-time monitoring index for static voltage stability analysis of the high-proportion new energy power system based on the operation parameters;
the second calculation unit is used for determining a real-time judgment index representing the stable critical stable state of the static voltage of the high-proportion new energy power system based on the operation parameters;
the margin unit is used for obtaining a real-time margin index for static voltage stability analysis of the high-proportion new energy power system based on the real-time monitoring index and the real-time judging index;
and the judging unit is used for judging whether the high-proportion new energy power system is in a static stability limit state or not according to the real-time margin index and a preset margin quantization standard for static voltage stability analysis of the high-proportion new energy power system.
Optionally, determining a real-time short-circuit ratio index for quantitatively evaluating the voltage stability of the high-proportion new energy power system based on the operating parameter includes:
based on the operation parameters, establishing an equivalence analysis model of the high-proportion new energy power system, wherein the equivalence analysis model comprises the following steps:
wherein the content of the first and second substances,
for a system thevenin equivalent potential, is>
For the voltage of the new energy grid-connected node i, Z i The system thevenin equivalent impedance per unit value, based on the measured value>
Current flowing into the system for node i;
establishing a real-time monitoring index for quantitatively evaluating the voltage stability of the high-proportion new energy power system according to the equivalence analysis model, wherein the real-time monitoring index comprises the following steps:
wherein, RTSSI i For real-time monitoring index, subscript P is per unit system with nominal voltage as reference voltage, subscript i is node number,
for a system thevenin equivalent potential, is>
And the real-time operation voltage of the new energy grid-connected node i is obtained. />
Optionally, the real-time criterion is as follows:
wherein, the RTCSSI i For real-time limit discrimination indicators, U P,i Real-time operation voltage for new energy grid-connected node i
The amplitude of (c).
Optionally, the real-time margin index is as follows:
RTΔ i ＝RTSSI i -RTCSSI i
wherein, RT.DELTA. i RTSSI as a real-time margin indicator i For monitoring the indicators in real time, RTCSI i Is a real-time discrimination index.
Optionally, the margin quantization standard is preset as follows:
if the real-time margin index RT delta i If the value of the new energy is greater than 0, determining that the high-proportion new energy power system is in a stable state;
if the real-time margin index RT delta i If the value of the voltage is equal to 0, determining that the high-proportion new energy power system is in a static voltage critical stable state;
if the real-time margin index RT delta i If the value of (1) is less than 0, determining that the high-proportion new energy power system is in a destabilization state.
In yet another aspect, the present invention also provides a computing device comprising: one or more processors;
a processor for executing one or more programs;
when executed by the one or more processors, implement the methods as described above.
In yet another aspect, the invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed, performs the method as described above.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for distinguishing a static state of a high-proportion new energy power system in real time, which comprises the following steps: acquiring operation parameters of a high-proportion new energy power system, and determining a real-time monitoring index for static voltage stability analysis of the high-proportion new energy power system based on the operation parameters; determining a real-time discrimination index representing the static voltage stability critical stable state of the high-proportion new energy power system based on the operation parameters; obtaining a real-time margin index for static voltage stability analysis of the high-proportion new energy power system based on the real-time monitoring index and the real-time distinguishing index; and judging whether the high-proportion new energy power system is in a static stability limit state or not according to the real-time margin index and a preset margin quantization standard for static voltage stability analysis of the high-proportion new energy power system. The voltage stability of the high-proportion new energy power system can be effectively quantitatively evaluated in real time, the running state of the system voltage is monitored, and the safe and stable running of the high-proportion new energy power system is guaranteed.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a block diagram of the system of 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.
Example 1:
the invention provides a method for distinguishing a static state of a high-proportion new energy power system in real time, which comprises the following steps of:
step 1, obtaining operation parameters of a high-proportion new energy power system, and determining a real-time monitoring index for static voltage stability analysis of the high-proportion new energy power system based on the operation parameters;
step 2, determining a real-time judgment index representing the stable critical stable state of the static voltage of the high-proportion new energy power system based on the operation parameters;
step 3, obtaining a real-time margin index for static voltage stability analysis of the high-proportion new energy power system based on the real-time monitoring index and the real-time judging index;
and 4, judging whether the high-proportion new energy power system is in a static stability limit state or not according to the real-time margin index and a preset margin quantization standard for static voltage stability analysis of the high-proportion new energy power system.
Wherein, based on the operating parameters, determining a real-time monitoring index for quantitatively evaluating the voltage stability of the high-proportion new energy power system comprises:
based on the operation parameters, establishing an equivalence analysis model of the high-proportion new energy power system, wherein the equivalence analysis model comprises the following steps:
wherein the content of the first and second substances,
for system thevenin equivalent potential, in>
Node operating voltage, Z, for new energy grid-connected node i i Is the equivalent impedance of the system thevenin @>
The equivalent current flowing into the system for node i;
establishing a real-time monitoring index for quantitatively evaluating the voltage stability of the high-proportion new energy power system according to the equivalence analysis model, wherein the real-time monitoring index comprises the following steps:
wherein, RTSSI i For real-time monitoring index, subscript P is per unit system with nominal voltage as reference voltage, subscript i is node number,
for a system thevenin equivalent potential, is>
And the real-time operation voltage of the new energy grid-connected node i is obtained.
The real-time judgment indexes are as follows:
wherein, the RTCSSI i For real-time discrimination of the index, U P,i Real-time operation voltage for new energy grid-connected node i
The amplitude of (c).
The real-time margin indexes are as follows:
RTΔ i ＝RTSSI i -RTCSSI i
wherein, RT.DELTA. i For real-time margin indicator, RTSSI i For monitoring the indicators in real time, RTCSI i Is a real-time discrimination index.
The preset margin quantization standard is as follows:
if the real-time margin index RT delta i If the value of the new energy is greater than 0, determining that the high-proportion new energy power system is in a stable state;
if the real-time margin index RT delta i If the value of the voltage is equal to 0, determining that the high-proportion new energy power system is in a static voltage critical stable state;
if the real-time margin index RT delta i If the value of (1) is less than 0, determining that the high-proportion new energy power system is in a destabilization state.
Example 2:
the invention also provides a system 200 for real-time discrimination of the steady state of a high-proportion new energy power system, as shown in fig. 2, comprising:
the first calculating unit 201 is configured to obtain an operation parameter of a high-proportion new energy power system, and determine a real-time monitoring index for static voltage stability analysis of the high-proportion new energy power system based on the operation parameter;
the second calculating unit 202 is used for determining a real-time judgment index representing the stable critical stable state of the static voltage of the high-proportion new energy power system based on the operation parameters;
the margin unit 203 is used for obtaining a real-time margin index for static voltage stability analysis of the high-proportion new energy power system based on the real-time monitoring index and the real-time judging index;
and a judging unit 204, configured to judge whether the high-proportion new energy power system is in a static stability limit state according to the real-time margin index and a preset margin quantization standard for static voltage stability analysis of the high-proportion new energy power system.
Wherein, based on the operating parameters, determining a real-time monitoring index for quantitatively evaluating the voltage stability of the high-proportion new energy power system comprises:
based on the operation parameters, establishing an equivalence analysis model of the high-proportion new energy power system, wherein the equivalence analysis model comprises the following steps:
wherein the content of the first and second substances,
for system thevenin equivalent potential, in>
For real-time operating voltage, Z, of new energy grid-connected node i i Is the equivalent impedance of the system thevenin @>
The equivalent current flowing into the system for node i;
establishing a real-time monitoring index for quantitatively evaluating the voltage stability of the high-proportion new energy power system according to the equivalence analysis model, wherein the real-time monitoring index comprises the following steps:
wherein, RTSSI i For real-time monitoring index, subscript P is per unit system with nominal voltage as reference voltage, subscript i is node number,
for system thevenin equivalent potential, in>
Grid-connected node for new energyi real-time operating voltage.
The real-time judgment indexes are as follows:
wherein, the RTCSSI i For real-time limit discrimination indicators, U P,i Real-time operation voltage for new energy grid-connected node i
The amplitude of (c).
The real-time margin indexes are as follows:
RTΔ i ＝RTSSI i -RTCSSI i
wherein, RT.DELTA. i RTSSI as a real-time margin indicator i For monitoring the indicators in real time, RTCSSI i Is a real-time discrimination index.
The preset margin quantization standard is as follows:
if the real-time margin index RT delta i If the value of the new energy is greater than 0, determining that the high-proportion new energy power system is in a stable state;
if the real-time margin index RT delta i If the value of the voltage is equal to 0, determining that the high-proportion new energy power system is in a static voltage critical stable state;
if the real-time margin index RT delta i If the value of (1) is less than 0, determining that the high-proportion new energy power system is in a destabilization state.
The method can effectively carry out real-time quantitative evaluation on the voltage stability of the high-proportion new energy power system, monitor the running state of the system voltage and ensure the safe and stable running of the high-proportion new energy power system.
Example 3:
based on the same inventive concept, the present invention also provides a computer apparatus comprising a processor and a memory, the memory being configured to store a computer program comprising program instructions, the processor being configured to execute the program instructions stored by the computer storage medium. The Processor may be a Central Processing Unit (CPU), or may be other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable gate array (FPGA) or other Programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc., which is a computing core and a control core of the terminal, and is specifically adapted to load and execute one or more instructions in a computer storage medium to implement a corresponding method flow or a corresponding function, so as to implement the steps of the method in the above embodiments.
Example 4:
based on the same inventive concept, the present invention further provides a storage medium, in particular, a computer-readable storage medium (Memory), which is a Memory device in a computer device and is used for storing programs and data. It is understood that the computer readable storage medium herein can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space storing an operating system of the terminal. Also, one or more instructions, which may be one or more computer programs (including program code), are stored in the memory space and are adapted to be loaded and executed by the processor. It should be noted that the computer-readable storage medium may be a high-speed RAM memory, or may be a non-volatile memory (non-volatile memory), such as at least one disk memory. One or more instructions stored in a computer-readable storage medium may be loaded and executed by a processor to implement the steps of the method in the above-described embodiments.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 scheme in the embodiment of the invention can be realized by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (12)
1. A method for distinguishing a static state of a high-proportion new energy power system in real time is characterized by comprising the following steps:
acquiring operation parameters of a high-proportion new energy power system, and determining a real-time monitoring index for static voltage stability analysis of the high-proportion new energy power system based on the operation parameters;
determining a real-time judgment index representing the stable critical stable state of the static voltage of the high-proportion new energy power system based on the operation parameters;
obtaining a real-time margin index for static voltage stability analysis of the high-proportion new energy power system based on the real-time monitoring index and the real-time distinguishing index;
and judging whether the high-proportion new energy power system is in a static stability limit state or not according to the real-time margin index and a preset margin quantization standard for static voltage stability analysis of the high-proportion new energy power system.
2. The method of claim 1, wherein determining a real-time monitoring indicator for static voltage stability analysis of the high-proportion new energy power system based on the operating parameter comprises:
based on the operation parameters, establishing an equivalence analysis model of the high-proportion new energy power system, wherein the equivalence analysis model comprises the following steps:
wherein the content of the first and second substances,
is the equivalent potential of the system thevenin,
for real-time operating voltage, Z, of new energy grid-connected node i i Is the equivalent impedance of the system thevenin,
the equivalent current flowing into the system for node i;
according to the equivalence analysis model, establishing a real-time monitoring index for static voltage stability analysis of the high-proportion new energy power system, wherein the real-time monitoring index comprises the following steps:
wherein, RTSSI i For real-time monitoring index, subscript P is per unit system with nominal voltage as reference voltage, subscript i is node number,
is the equivalent potential of the system thevenin,
and the real-time operation voltage of the new energy grid-connected node i is obtained.
3. The method according to claim 1, wherein the real-time criterion of the static voltage stability critical steady state of the high-proportion new energy power system is as follows:
wherein, the RTCSSI i For real-time discrimination of the index, U P,i Real-time operation voltage for new energy grid-connected node i
The amplitude of (c).
4. The method of claim 1, wherein the real-time margin indicator is as follows:
RTΔ i ＝RTSSI i -RTCSSI i
wherein, RT.DELTA. i RTSSI as a real-time margin indicator i For monitoring the indicators in real time, RTCSI i Is a real-time discrimination index.
5. The method of claim 1, wherein the preset margin quantization criterion is as follows:
if the real-time margin index RT delta i If the value of the new energy is greater than 0, determining that the high-proportion new energy power system is in a stable state;
if the real-time margin index RT delta i If the value of the voltage is equal to 0, determining that the high-proportion new energy power system is in a static voltage critical stable state;
if the real-time margin index RT delta i If the value of (1) is less than 0, determining that the high-proportion new energy power system is in a destabilization state.
6. A system for real-time discrimination of a static state of a high-proportion new energy power system is characterized by comprising:
the system comprises a first calculation unit, a second calculation unit and a third calculation unit, wherein the first calculation unit is used for acquiring operation parameters of a high-proportion new energy power system and determining a real-time monitoring index for static voltage stability analysis of the high-proportion new energy power system based on the operation parameters;
the second calculation unit is used for determining a real-time judgment index representing the stable critical stable state of the static voltage of the high-proportion new energy power system based on the operation parameters;
the margin unit is used for obtaining a real-time margin index for static voltage stability analysis of the high-proportion new energy power system based on the real-time monitoring index and the real-time judging index;
and the judging unit is used for judging whether the high-proportion new energy power system is in a static stability limit state or not according to the real-time margin index and a preset margin quantization standard for static voltage stability analysis of the high-proportion new energy power system.
7. The system of claim 6, wherein the determining a real-time monitoring indicator for quantitatively evaluating the voltage stability of the high-proportion new energy power system based on the operating parameter comprises:
based on the operation parameters, establishing an equivalence analysis model of the high-proportion new energy power system, wherein the equivalence analysis model comprises the following steps:
wherein the content of the first and second substances,
is the equivalent potential of the system thevenin,
for real-time operating voltage, Z, of new energy grid-connected node i i Is the equivalent impedance of the system thevenin,
the equivalent current flowing into the system for node i;
establishing a real-time monitoring index for quantitatively evaluating the voltage stability of the high-proportion new energy power system according to the equivalence analysis model, wherein the real-time monitoring index comprises the following steps:
wherein, RTSSI i For real-time monitoring index, subscript P is under the standard system with the standard voltage as the reference voltage, subscript i is the node number,
is the equivalent potential of the system thevenin,
and the real-time operation voltage of the new energy grid-connected node i is obtained.
8. The system of claim 6, wherein the real-time metrics are as follows:
wherein, the RTCSSI i For real-time limit discrimination indicators, U P,i Real-time operation voltage for new energy grid-connected node i
The amplitude of (c).
9. The system of claim 6, wherein the real-time margin indicator is as follows:
RTΔ i ＝RTSSI i -RTCSSI i
wherein, RT.DELTA. i RTSSI as a real-time margin indicator i For monitoring the indicators in real time, RTCSI i Is a real-time discrimination index.
10. The system of claim 6, wherein the preset margin quantization criterion is as follows:
if the real-time margin index RT delta i If the value of the energy storage capacity is larger than 0, determining that the high-proportion new energy power system is in a stable state;
if the real-time margin index RT delta i If the value of the voltage is equal to 0, determining that the high-proportion new energy power system is in a static voltage critical stable state;
if the real-time margin index RT delta i If the value of (1) is less than 0, determining that the high-proportion new energy power system is in a destabilization state.
11. A computer device, comprising:
one or more processors;
a processor for executing one or more programs;
the one or more programs, when executed by the one or more processors, implement the method of any of claims 1-5.
12. A computer-readable storage medium, having stored thereon a computer program which, when executed, implements the method of any one of claims 1-5.
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| CN117215205A (en) * | 2023-11-09 | 2023-12-12 | 国网经济技术研究院有限公司 | DC system control parameter analysis method based on decision tree and ISS theory |
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| CN117215205A (en) * | 2023-11-09 | 2023-12-12 | 国网经济技术研究院有限公司 | DC system control parameter analysis method based on decision tree and ISS theory |
| CN117215205B (en) * | 2023-11-09 | 2024-02-06 | 国网经济技术研究院有限公司 | DC system control parameter analysis method based on decision tree and ISS theory |
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