CN110707689B - Stability analysis method and device suitable for full-clean energy power generation power grid - Google Patents
Stability analysis method and device suitable for full-clean energy power generation power grid Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- 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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Abstract
The invention discloses an analysis method suitable for the stability of a full-clean energy power generation power grid, which comprises the following steps: acquiring horizontal year calculation data of a target power grid; replacing all thermal power generation data in the horizontal year calculation data with clean energy power generation data with the same generated energy, and taking the replaced data as full clean energy power generation grid data; carrying out load flow calculation on the data of the full clean energy power generation grid; performing transient stability analysis on the data of the full-clean energy power generation power grid; performing small interference stability analysis on the data of the full clean energy power generation power grid, and judging a low-frequency oscillation area and a line of a target power grid; calculating the frequency modulation requirement of the full clean energy power generation; and calculating the peak regulation demand of the full clean energy power generation. The stability analysis method applicable to the full-clean-energy power generation power grid disclosed by the invention can be used for analyzing whether the power grid for full-clean-energy power generation meets the safe and stable operation requirement of the power grid. The invention also discloses a device and a storage medium.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a method and a device for analyzing the stability of a full-clean energy power generation grid.
Background
The goal of a new energy revolution is to gradually replace fossil energy with renewable energy, and realize that clean energy such as renewable energy and nuclear energy occupies a larger share in primary energy production and consumption. From the perspective of power and electric quantity balance, clean energy power generation can meet the power demand in a part of provinces of China, especially in areas rich in clean energy such as Qinghai, Yunnan and Sichuan.
However, the operation of the power system not only needs to satisfy the power electricity balance, but also needs to consider the physical characteristic constraint of the power network and the safe and stable operation constraint of the power system.
Therefore, a method for analyzing whether the power grid generated by the clean energy meets the safe and stable operation requirement of the power grid is needed.
Disclosure of Invention
The embodiment of the invention provides an analysis method suitable for the stability of a full-clean energy power generation power grid, which can be used for analyzing whether the power grid for full-clean energy power generation meets the safe and stable operation requirement of the power grid.
The embodiment of the invention provides an analysis method suitable for the stability of a clean energy power generation power grid, which comprises the following steps:
acquiring horizontal year calculation data of a target power grid;
replacing all thermal power generation data in the horizontal year calculation data with clean energy power generation data with the same generated energy, and taking the replaced data as full clean energy power generation grid data;
carrying out load flow calculation on the data of the full clean energy power generation power grid, and counting heavy overload lines and heavy overload substations in the target power grid;
performing transient stability analysis on the full clean energy power generation grid data, counting fault types causing instability of the target power grid, and analyzing fault reasons;
performing small interference stability analysis on the full clean energy power generation power grid data, and judging a low-frequency oscillation area and a line of the target power grid;
calculating the frequency modulation requirement of the full clean energy power generation, and calculating whether the target power grid and the current power supply mode of the target power grid meet the frequency modulation requirement;
and calculating the peak regulation requirement of the full clean energy power generation, and calculating whether the target power grid and the current power supply mode of the target power grid meet the peak regulation requirement.
As an improvement of the above scheme, the clean energy power generation data includes at least one of hydraulic power generation data, wind power generation data and photovoltaic power generation data.
As an improvement of the above, the replacing of all thermal power generation data in the horizontal year calculation data with clean energy power generation data of the same power generation amount specifically includes:
when one thermal generator set is shut down, clean energy which is equal to the generated energy of the shut-down thermal generator set is added to reduce power generation, and load flow calculation is carried out; and if the trend is not converged, the next thermal generator set is shut down until all the thermal generator sets are shut down one by one.
As an improvement of the above scheme, the increasing of the clean energy power generation equal to the reduction of the power generation amount of the shutdown thermal power generation unit specifically includes: the sequence of increasing clean energy power generation is to increase hydroelectric power generation, then increase wind power generation and finally increase photovoltaic power generation.
As an improvement to the above solution, the fault types causing the target grid to be unstable include: the method comprises the steps of target power grid N-1 faults, target power grid N-2 faults and switch failure faults in a three-phase short circuit single phase.
As an improvement of the above scheme, the performing small interference stability analysis on the data of the full clean energy power generation grid specifically includes:
calculating the damping ratio of the oscillation mode of the full-clean energy power generation grid data;
selecting an oscillation mode with the damping ratio lower than 3.5% and two corresponding machine groups according to the calculation result;
let K be the number of connecting lines between two sets of the ith oscillation modeiThen, the fault of the ith oscillation mode transient calculation is: kiThe return connection lines respectively generate permanent short circuit faults of the three-phase lines;
the lengths and the load rates of the connecting lines between the two machine group groups are sorted according to the lengths of the lines from long to short, the lines with the same length are sorted according to the load rates from high to low,the oscillation mode machine set tie line sequence is 1, 2, …, j, …, Ki；
Carrying out prony analysis on the transient stability calculation result of the ith oscillation mode, and counting the communication that the damping ratio is less than 2%; if the damping ratio of the line with the sequence of j is more than 2%, j +1 to K do not need to be analyzediThe damping ratio of the return line is that the ith oscillation mode weak damping line is 1 to j-1 return line;
after the ith oscillation mode is finished, carrying out prony analysis on the transient stability calculation result of the (i + 1) th oscillation mode, and connecting the statistical damping ratio of less than 2% until the statistical analysis of the weak damping connecting lines of the N weak damping modes is finished; wherein N is the number of oscillation modes with a damping ratio lower than 3.5%.
As an improvement of the above scheme, the calculating of the frequency modulation requirement of the full clean energy power generation specifically includes: and calculating the influence of wind power generation and photovoltaic power generation on the frequency modulation demand, calculating the frequency modulation demand of the target power grid, and obtaining the primary frequency modulation margin and the secondary frequency modulation margin of the target power grid.
As an improvement of the above scheme, the calculating of the peak shaving demand of the full clean energy power generation specifically includes: and analyzing the influence of wind power generation and photovoltaic power generation on peak regulation requirements, and carrying out peak regulation balance analysis on the target power grid.
Correspondingly, the embodiment of the invention provides an analysis device suitable for the stability of a clean energy power generation grid, which comprises: the system comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to realize an analysis method suitable for the stability of the full clean energy power generation grid according to the first embodiment of the invention.
The third embodiment of the present invention correspondingly provides a computer-readable storage medium, which is characterized in that the computer-readable storage medium includes a stored computer program, and when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the analysis method suitable for the stability of the fully clean energy power generation grid according to the first embodiment of the present invention.
The stability analysis method suitable for the full-clean energy power generation power grid provided by the embodiment of the invention has the following beneficial effects:
the thermal power of non-clean energy in the target power grid is replaced by the same clean energy, so that the stability of the power grid for generating the full clean energy is analyzed, and whether the power grid for generating the full clean energy meets the safe and stable operation requirement of the power grid or not can be analyzed; through carrying out load flow calculation on the data of the full-clean energy power generation power grid, a heavy overload circuit and a heavy overload transformer substation in a target power grid are counted, so that timely regulation and control of operators are facilitated, and the stability of the power grid is maintained; through analyzing wind power and photovoltaic output characteristics and load characteristics, the positive peak regulation characteristics and the negative peak regulation characteristics of the output characteristics and the load characteristics are researched, whether the existing power grid and mode arrangement can meet the frequency modulation requirement can be further judged, and the safe operation performance of the power grid is improved.
Drawings
Fig. 1 is a schematic flow chart of an analysis method suitable for stability of a clean energy power generation grid according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic flow chart of an analysis method suitable for stability of a clean energy power generation grid according to an embodiment of the present invention is shown, including:
s101, acquiring horizontal year calculation data of a target power grid;
s102, replacing all thermal power generation data in the horizontal year calculation data with clean energy power generation data with the same power generation amount, and taking the replaced data as full clean energy power generation grid data;
s103, carrying out load flow calculation on the data of the full-clean energy power generation power grid, and counting heavy overload lines and heavy overload substations in a target power grid;
s104, performing transient stability analysis on the data of the full-clean energy power generation power grid, counting fault types causing instability of a target power grid, and analyzing fault reasons;
s105, performing small interference stability analysis on the data of the full clean energy power generation power grid, and judging a low-frequency oscillation area and a line of a target power grid;
s106, calculating the frequency modulation requirement of the full clean energy power generation, and calculating whether the target power grid and the current power supply mode of the target power grid meet the frequency modulation requirement or not;
s107, calculating the peak regulation requirement of the full clean energy power generation, and calculating whether the target power grid and the current power supply mode of the target power grid meet the peak regulation requirement.
Preferably, the horizontal year calculation data refers to BPA calculation data required for performing stable analysis, and includes grid structure data, unit output, stable parameters and the like.
Preferably, transient stability analysis is performed through BPA software simulation, and different fault types are set in BPA software and then calculation is performed.
Further, the clean energy power generation data at least comprises one of hydraulic power generation data, wind power generation data and photovoltaic power generation data.
Further, replacing all thermal power generation data in the horizontal year calculation data with clean energy power generation data with the same power generation amount specifically includes:
when one thermal generator set is shut down, clean energy which is equal to the generated energy of the shut-down thermal generator set is added to reduce power generation, and load flow calculation is carried out; and if the trend is not converged, the next thermal generator set is shut down until all the thermal generator sets are shut down one by one.
Furthermore, increasing the clean energy power generation equal to the reduction of the generated energy of the thermal generator set which is shut down specifically includes: the sequence of increasing clean energy power generation is to increase hydroelectric power generation, then increase wind power generation and finally increase photovoltaic power generation.
Further, the types of faults that cause the target grid to be unstable include: the method comprises the steps of target power grid N-1 faults, target power grid N-2 faults and switch failure faults in a three-phase short circuit single phase.
Further, carry out the stable analysis of little interference to full clean energy power generation electric wire netting data, specifically include:
calculating the damping ratio of the oscillation mode of the full-clean energy power generation grid data;
selecting an oscillation mode with the damping ratio lower than 3.5% and two corresponding machine groups according to the calculation result;
let K be the number of connecting lines between two sets of the ith oscillation modeiThen, the fault of the ith oscillation mode transient calculation is: kiThe return connection lines respectively generate permanent short circuit faults of the three-phase lines;
sorting the lengths and the load rates of the links between the two machine group groups according to the line lengths from long to short, and sorting the links with the same length from high to low according to the load rates, wherein the sorting orders of the links of the oscillation mode machine group are respectively 1, 2, …, j, … and Ki；
Carrying out prony analysis on the transient stability calculation result of the ith oscillation mode, and counting the communication that the damping ratio is less than 2%; if the damping ratio of the line with the sequence of j is more than 2%, j +1 to K do not need to be analyzediThe damping ratio of the return line is that the ith oscillation mode weak damping line is 1 to j-1 return line;
after the ith oscillation mode is finished, carrying out prony analysis on the transient stability calculation result of the (i + 1) th oscillation mode, and connecting the statistical damping ratio of less than 2% until the statistical analysis of the weak damping connecting lines of the N weak damping modes is finished; wherein N is the number of oscillation modes with a damping ratio lower than 3.5%.
Further, calculating the frequency modulation requirement of the full clean energy power generation specifically comprises: and calculating the influence of wind power generation and photovoltaic power generation on the frequency modulation demand, calculating the frequency modulation demand of the target power grid, and obtaining the primary frequency modulation margin and the secondary frequency modulation margin of the target power grid.
Further, calculating the peak regulation requirement of the full clean energy power generation specifically comprises: and analyzing the influence of wind power generation and photovoltaic power generation on peak regulation requirements, and carrying out peak regulation balance analysis on the target power grid.
Preferably, the output fluctuation of wind power and photovoltaic can increase the frequency modulation requirement of the power grid, and the temporal and spatial distribution characteristics can increase or reduce the peak modulation requirement. Through analyzing wind power and photovoltaic output characteristics and load characteristics, the positive peak regulation characteristic and the negative peak regulation characteristic of the output characteristics and the load characteristics are researched, and whether the existing power grid and mode arrangement can meet the frequency modulation requirement can be further judged.
The stability analysis method suitable for the full-clean energy power generation power grid provided by the embodiment of the invention has the following beneficial effects:
the thermal power of non-clean energy in the target power grid is replaced by the same clean energy, so that the stability of the power grid for generating the full clean energy is analyzed, and whether the power grid for generating the full clean energy meets the safe and stable operation requirement of the power grid or not can be analyzed; through carrying out load flow calculation on the data of the full-clean energy power generation power grid, a heavy overload circuit and a heavy overload transformer substation in a target power grid are counted, so that timely regulation and control of operators are facilitated, and the stability of the power grid is maintained; through analyzing wind power and photovoltaic output characteristics and load characteristics, the positive peak regulation characteristics and the negative peak regulation characteristics of the output characteristics and the load characteristics are researched, whether the existing power grid and mode arrangement can meet the frequency modulation requirement can be further judged, and the safe operation performance of the power grid is improved.
The embodiment of the invention correspondingly provides an analysis device suitable for the stability of a fully clean energy power generation grid, which comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the analysis device realizes the analysis method suitable for the stability of the fully clean energy power generation grid according to the first embodiment of the invention. The analysis device suitable for the stability of the full-clean energy power generation grid can be a desktop computer, a notebook computer, a palm computer, a cloud server and other computing equipment. The analysis device suitable for the stability of the full clean energy power generation grid can include, but is not limited to, a processor and a memory.
The third embodiment of the present invention correspondingly provides a computer-readable storage medium, which is characterized in that the computer-readable storage medium includes a stored computer program, and when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the analysis method suitable for the stability of the clean energy power generation grid according to the first embodiment of the present invention.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. The general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor is a control center of the analysis device suitable for the stability of the all-clean energy power generation grid, and various interfaces and lines are used for connecting various parts of the whole analysis device suitable for the stability of the all-clean energy power generation grid.
The memory may be used to store the computer programs and/or modules, and the processor may implement the various functions of the analysis apparatus suitable for the stability of the all-clean energy power generation grid by operating or executing the computer programs and/or modules stored in the memory and calling up the data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein, the module/unit integrated by the analysis device suitable for the stability of the clean energy power generation grid can be stored in a computer readable storage medium if the module/unit is realized in the form of a software functional unit and is sold or used as an independent product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. An analysis method suitable for stability of a full clean energy power generation grid is characterized by comprising the following steps:
acquiring horizontal year calculation data of a target power grid;
replacing all thermal power generation data in the horizontal year calculation data with clean energy power generation data with the same generated energy, and taking the replaced data as full clean energy power generation grid data;
carrying out load flow calculation on the data of the full clean energy power generation power grid, and counting heavy overload lines and heavy overload substations in the target power grid;
performing transient stability analysis on the full clean energy power generation grid data, counting fault types causing instability of the target power grid, and analyzing fault reasons;
performing small interference stability analysis on the full clean energy power generation power grid data, and judging a low-frequency oscillation area and a line of the target power grid;
calculating the frequency modulation requirement of the full clean energy power generation, and calculating whether the target power grid and the current power supply mode of the target power grid meet the frequency modulation requirement;
calculating the peak regulation requirement of the full clean energy power generation, and calculating whether the target power grid and the current power supply mode of the target power grid meet the peak regulation requirement or not;
wherein, to the little interference stability analysis is carried out to full clean energy power generation electric wire netting data, specifically includes:
calculating the damping ratio of the oscillation mode of the full-clean energy power generation grid data;
selecting an oscillation mode with the damping ratio lower than 3.5% and two corresponding machine groups according to the calculation result;
let K be the number of connecting lines between two sets of the ith oscillation modeiThen, the fault of the ith oscillation mode transient calculation is: kiThe return connection lines respectively generate permanent short circuit faults of the three-phase lines;
sorting the lengths and the load rates of the links between the two machine group groups according to the line lengths from long to short, and sorting the links with the same length according to the load rates from high to low, wherein the sorting orders of the links of the oscillation mode machine group are respectively 1, 2, …, j, … and Ki；
Carrying out prony analysis on the transient stability calculation result of the ith oscillation mode, and counting the communication that the damping ratio is less than 2%; if the damping ratio of the line with the sequence of j is more than 2%, j +1 to K do not need to be analyzediThe damping ratio of the return line is that the ith oscillation mode weak damping line is 1 to j-1 return line;
after the ith oscillation mode is finished, carrying out prony analysis on the transient stability calculation result of the (i + 1) th oscillation mode, and connecting the statistical damping ratio of less than 2% until the statistical analysis of the weak damping connecting lines of the N weak damping modes is finished; wherein N is the number of oscillation modes with a damping ratio lower than 3.5%.
2. The method according to claim 1, wherein the clean energy generation data comprises at least one of hydro generation data, wind generation data and photovoltaic generation data.
3. The method for analyzing the stability of the all-clean-energy power generation grid according to claim 2, wherein the step of replacing all thermal power generation data in the horizontal year calculation data with clean-energy power generation data with the same power generation amount specifically comprises:
when one thermal generator set is shut down, clean energy which is equal to the generated energy of the shut-down thermal generator set is added to reduce power generation, and load flow calculation is carried out; and if the trend is not converged, the next thermal generator set is shut down until all the thermal generator sets are shut down one by one.
4. The method according to claim 3, wherein the step of increasing the clean energy power generation amount equal to the reduction of the power generation amount of the stopped thermal power generating unit comprises: the sequence of increasing clean energy power generation is to increase hydroelectric power generation, then increase wind power generation and finally increase photovoltaic power generation.
5. The method according to claim 4, wherein the fault types causing the instability of the target grid comprise: the method comprises the steps of target power grid N-1 faults, target power grid N-2 faults and switch failure faults in a three-phase short circuit single phase.
6. The method according to claim 1, wherein the calculating the frequency modulation requirement of the clean energy power generation specifically comprises: and calculating the influence of wind power generation and photovoltaic power generation on the frequency modulation demand, calculating the frequency modulation demand of the target power grid, and obtaining the primary frequency modulation margin and the secondary frequency modulation margin of the target power grid.
7. The method according to claim 1, wherein the calculating the peak shaver requirement of the clean energy power generation system comprises: and analyzing the influence of wind power generation and photovoltaic power generation on peak regulation requirements, and carrying out peak regulation balance analysis on the target power grid.
8. An analysis apparatus adapted for stability of a full clean energy power generation grid, comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor when executing the computer program implementing an analysis method adapted for stability of a full clean energy power generation grid according to any one of claims 1 to 7.
9. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform an analysis method for stability of a full clean energy power generation grid according to any one of claims 1 to 7.
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