CN113949075A - New energy network source coordinated frequency modulation and inertia support online monitoring and analysis system and method - Google Patents
New energy network source coordinated frequency modulation and inertia support online monitoring and analysis system and method Download PDFInfo
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- 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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- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
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- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00028—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment involving the use of Internet protocols
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- 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
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
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- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
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Abstract
The invention discloses a new energy network source coordinated frequency modulation and inertia support online monitoring and analysis system and a method, which are suitable for monitoring and analysis work of a new energy plant station, solve the problems of efficient acquisition and fusion of operation data of the new energy plant station, solve the problems of primary frequency modulation and inertia support capacity online calculation and evaluation of a power plant, contribute to finding out factors influencing safe and stable operation of a power grid, and optimize unit scheduling operation. The new energy network source coordinated frequency modulation and inertia online monitoring and analyzing system realizes remote monitoring and evaluation of the operating state parameters, frequency modulation supporting capacity and inertia supporting capacity of the whole substation, the power collecting line and the single machine of the substation by the main station. The new energy network source coordinated frequency modulation and inertia online monitoring method realizes remote monitoring and evaluation of the operating state parameters, frequency modulation supporting capacity, inertia supporting capacity and evaluation of the whole substation, the power collecting line and the single machine of the substation by the main station.
Description
Technical Field
The invention relates to the technical field of new energy power generation grid connection and operation control, in particular to a new energy grid source coordination frequency modulation and inertia support online monitoring and analysis system and method.
Background
With the gradual operation of extra-high voltage engineering and the rapid increase of the installed capacity of new energy, the random fluctuation characteristics of new energy such as wind energy, solar energy and the like can directly influence the safe and stable operation of a power grid.
On one hand, the power grid needs to realize consumption of new energy and maintain the balance of supply and demand of the power system, and on the other hand, the new energy is required to participate in the inevitable trend of daily regulation and control of the system for development.
The safety and stability guide of the power system and the network source coordination technical specification of the power system clearly provide that various grid-connected power supplies including new energy sources have primary frequency modulation capability and necessary inertia support is provided. The network-related regulation performance of various generator sets is closely related to the real-time running state, and for solving the problems, a multi-source information acquisition technology is urgently needed to realize data fusion analysis, and the requirement for constructing a new energy network source coordination online monitoring and analyzing system is particularly urgent.
Mutual influence between a power supply and a power grid is increasingly enhanced, part of grid-connected new energy stations have the problem of incomplete performance index of a regulation system, and the power grid dispatching operation support is poor; and the scheduling mechanism monitors dead zones of data and information of the grid-connected power plant.
The prior patent publication number is CN112636374A, the name is a primary frequency modulation and virtual inertia response control method and device for a wind power station, and relates to the technical field of power grid frequency modulation, the wind power station comprises a wind turbine generator and a centralized flywheel energy storage array system connected with the wind turbine generator, and the method comprises the following steps: receiving instruction information sent by an automatic power generation control system, and acquiring voltage, current and power grid frequency at a grid-connected point of a wind power plant station in real time; and controlling the wind turbine generator and the centralized flywheel energy storage array system to perform primary frequency modulation or virtual inertia response according to the voltage, the current, the power grid frequency and the frequency change rate corresponding to the power grid frequency. According to the invention, the centralized flywheel energy storage array system is configured in the wind power station, and the primary frequency and virtual inertia response of the power grid is participated by controlling the charging and discharging of the centralized flywheel energy storage array system, so that the wind turbine generator has primary frequency modulation and inertia response capability under the full-working-condition operation, the stability and the immunity of the wind turbine generator are improved, and the economical efficiency of the operation of the wind power station is improved.
The prior patent publication No. CN112884265A is named as an intelligent management method applied to network source coordination of an urban power grid, and firstly, load/power supply data is input; then the distribution network reports load information to a power transmission network dispatching center; then, the power transmission network dispatching center calculates the peak clipping and valley filling effects brought by the load curve of the power distribution network; then the power transmission network dispatching center judges whether a load curve of the power distribution network meets dispatching requirements or not; then the power transmission network dispatching center issues a load curve, and the power distribution network executes the load curve; then, the power transmission network makes a power generation plan and a scheduling scheme; and finally, issuing a scheduling scheme. The invention provides a longitudinal interactive scheduling mode of various energy sources among power transmission and distribution networks, based on an advanced measurement and control system of an intelligent power grid, schedulable resources of a distributed power supply and a centralized power supply are coordinated among scheduling mechanisms of each layer of the power grid, and longitudinal interaction between the power transmission network and the power distribution network in a wide distribution area is realized, so that optimal safety, economic and environmental benefits are obtained.
The problems not solved by the prior art are as follows: how to monitor and evaluate the frequency modulation and inertia supporting capability of a station and a single machine in real time.
Disclosure of Invention
The invention aims to solve the technical problem of providing a new energy network source coordinated frequency modulation and inertia support online monitoring and analyzing system and method, which are suitable for monitoring and analyzing work of new energy plants. In order to solve the problem of monitoring and analyzing the grid-related regulation performance of various units in a complex power system, the invention is necessary to construct a real-time online monitoring and analyzing system for the frequency modulation and inertia supporting capability of a new energy plant station with good universality in a manner of the invention, so as to provide assistance for the stable and efficient operation of a power grid. In order to solve the problems, the technical scheme adopted by the invention is as follows:
the utility model provides a new forms of energy network source coordinate frequency modulation, inertia support on-line monitoring analytic system which characterized in that: the system comprises a power supply side substation, a communication server, a terminal side main station, a substation data acquisition module, a substation data preprocessing module, a substation database updating module, a data and wave recording file uploading module, a terminal main station wave recording file analyzing module, a cloud data storage module and a primary frequency modulation and inertia support evaluation module;
the power supply side substation is connected with the terminal side main station through the communication server and communicates with the terminal side main station; the substation carries out local storage data fusion on the collected primary frequency modulation device, stand-alone information, PMU, AGC, DCS, AVC, telecontrol device, power prediction running data waveform and station control level instruction information, and sends the data to a terminal side main station through a communication server, and the main station processes, calculates and examines the data on line, so that the main station can remotely monitor and evaluate the running state parameters, frequency modulation supporting capability and inertia supporting capability of the whole substation, an electric wire and a stand-alone of the substation.
As a further improvement of the system, the power supply substation data acquisition module is used for the power supply side substation to acquire various kinds of operation data of a primary frequency modulation device, single machine information, PMU, AGC, DCS and AVC of the new energy plant station and obtain sampling data; the substation data preprocessing module is used for the power supply side substation to perform time alignment local fusion and arrangement on the acquired data, and perform preprocessing and packaging according to a required format to be sent;
the substation database updating module is used for the power supply side substation to store the operation data and the wave recording file in the database; the database comprises two sub-databases, namely a plant station basic information and operation information database and a network-related regulation transient state recording information database, wherein the plant station basic information and operation information database is used for storing plant station, equipment and single machine operation information, the stored information comprises single-fan sending information, grid-connected point information, current collecting line information, bus information, SVG equipment information, wind power plant information, environment monitor information, power prediction result information and primary frequency modulation device measuring point data, the transient state recording information database is used for storing various recording files, and the stored information comprises AGC action process recording, AVC action process recording, primary frequency modulation action process recording and primary frequency modulation action process fan recording;
the data and wave recording file uploading module is used for the power supply side substation to send the sampled and preprocessed data to the dispatching end of the terminal side main station through the communication server of the dispatching ring network according to different specifications of importance degrees;
the terminal main station analysis recording file module is used for receiving and analyzing the data transmitted by the substation by the terminal main station, extracting and restoring the received data such as the plant station operation data, the single-machine transient and steady state data, the action information and the like of the unit;
the cloud data storage module is used for the terminal side master station to store the received data file in a cloud server connected with the terminal side master station and form a terminal side database;
the primary frequency modulation and inertia support evaluation module is used for calculating each performance index by the terminal side master station according to real-time and historical sampling data, comparing the calculation result with a standard evaluation index, and screening out an unqualified action process and an unqualified single machine; and establishing a mathematical model for evaluating the primary frequency modulation and inertia support characteristics of the new energy, and calculating the primary frequency modulation and inertia support capability of the new energy plant station by combining theoretical power and current output.
A new energy network source coordination frequency modulation and inertia support online monitoring and analysis method comprises the following steps:
step S1, preprocessing the substation data;
step S2, uploading data and wave recording files;
and step S3, detecting and analyzing by the terminal main station.
As a further improvement of the method, in the step of uploading the S2 data and the recording file, the power supply side substation sends the data after sampling pretreatment to the dispatching end of the terminal side main station through the communication server of the dispatching ring network according to different specifications of importance degrees.
As a further improvement of the method, the step S1 substation data preprocessing includes:
s101, acquiring substation data;
s102, preprocessing substation data;
and S103, updating the substation database.
As a further improvement of the method, in the step of collecting data of the substation S101, the power supply side substation collects various kinds of operation data of the primary frequency modulation device, the stand-alone information, the PMU, the AGC, the DCS, and the VC of the new energy plant and obtains sampling data.
As a further improvement of the method, in the step of S102 substation data preprocessing, the power supply side substation performs time-aligned local fusion arrangement on the acquired data, and performs preprocessing and packaging according to a required format to be uploaded.
As a further improvement of the method, in the step of updating the database of the substation S103, the power supply side substation stores the operation data and the recording file in the database; the database comprises two sub-databases, namely a plant station basic information and operation information database and a network-related regulation transient state recording information database, wherein the plant station basic information and operation information database is used for storing plant stations, equipment and single machine operation information, the stored information comprises single-fan sending information, grid-connected point information, current collecting line information, bus information, SVG equipment information, wind power plant information, environment monitor information, power prediction result information and primary frequency modulation device measuring point data, the transient state recording information database is used for storing various recording files, and the stored information comprises AGC action process recording, AVC action process recording, primary frequency modulation action process recording and primary frequency modulation action process fan recording.
As a further improvement of the method, the detecting and analyzing of the terminal master station in step S3 includes:
s301, the terminal master station analyzes the wave recording file;
s302, cloud data storage;
and S303, primary frequency modulation and inertia support evaluation.
As a further improvement of the method, in the step of analyzing the wave recording file by the terminal main station S301, the terminal side main station receives and analyzes the data transmitted by the sub-stations, and extracts and restores the plant station operation data, the single-machine transient and steady state data and the action information data of the unit;
in the step of S302 cloud data storage, the terminal side master station stores the received data file in a cloud server connected with the terminal side master station and forms a terminal side database;
in the step of S303 primary frequency modulation and inertia support evaluation, the terminal side master station calculates each performance index according to real-time and historical sampling data, compares the calculation result with the standard evaluation index, and screens out unqualified action processes and unqualified single machines.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the method is suitable for monitoring and analyzing work of the new energy plant station, solves the problems of efficient acquisition and fusion of operation data of the new energy plant station, solves the problems of primary frequency modulation and inertia supporting capacity online calculation and evaluation of the power plant, is beneficial to finding out factors influencing safe and stable operation of a power grid, and optimizes unit scheduling operation.
The new energy network source coordinated frequency modulation and inertia online monitoring and analyzing system realizes remote monitoring and evaluation of the operating state parameters, frequency modulation supporting capacity and inertia supporting capacity of the whole substation, the power collecting line and the single machine of the substation by the main station.
The new energy network source coordinated frequency modulation and inertia online monitoring method realizes remote monitoring and evaluation of the operating state parameters, frequency modulation supporting capacity, inertia supporting capacity and evaluation of the whole substation, the power collecting line and the single machine of the substation by the main station.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a structural schematic block diagram of a new energy network source coordinated frequency modulation and inertia online monitoring analysis system;
FIG. 2 is a schematic block diagram of data transmission of a new energy network source coordinated frequency modulation and inertia online monitoring and analysis system;
fig. 3 is a flow chart of a new energy network source coordination frequency modulation and inertia online monitoring method.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. 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 application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting.
Example 1:
as shown in fig. 1 and 2, the invention discloses a new energy network source coordinated frequency modulation and inertia online monitoring analysis system, which comprises seven program modules including a power supply side substation, a communication server, a terminal side main station, a power supply substation data acquisition module, a power supply substation data preprocessing module, a power supply substation database updating module, a data and wave recording file uploading module, a terminal main station analysis wave recording file module, a cloud data storage module and a primary frequency modulation and inertia support evaluation module, wherein the power supply side substation is connected with the terminal side main station through the communication server and is in one-way communication with the terminal side main station.
And the power supply substation data acquisition module is used for the power supply side substation to acquire the running data of various equipment such as a primary frequency modulation device, single machine information, PMU, AGC, DCS, AVC and the like of the new energy plant station and acquire sampling data. In engineering, a four-party CSC-850 programmable automation controller can be connected with a plant station equipment device through a switch to realize the collection of various information. Common industrial automation access protocols are supported: a standard PMU data acquisition access protocol, an IEC104(TCP/UDP) acquisition access protocol, a MODBUS (TCP/RTU) acquisition access protocol, and the like.
And the power supply substation data preprocessing module is used for the power supply side substation to send the sampled and preprocessed data to the scheduling end of the terminal side main station through the communication server of the scheduling ring network according to different specifications of importance degrees. And processing and packaging in an E text format and a Comtrade format according to requirements to be sent. One type of information such as single machine information, bus information, collecting wire information and the like is packaged into an E text format at a time interval of 5S for uploading, two types of information such as SVG equipment information and the like are packaged into the E text format at a time interval of 60S, three types of data such as environment monitor information, power prediction information and the like are packaged into the E text format at a time interval of 300S, and the wave recording of the action process of AGC, AVC and primary frequency modulation devices is in a Comtrade format with a data density of 20 ms.
The power supply substation database updating module is used for storing the operation data and the wave recording file in the database by the power supply side substation; the database comprises two sub-databases, namely a plant station basic information and operation information database and a network-related regulation transient state recording information database, wherein the plant station basic information and operation information database is used for storing plant station, equipment and single machine operation information, the stored information comprises single-fan sending information, grid-connected point information, current collecting line information, bus information, SVG equipment information, wind power plant information, environment monitor information, power prediction result information and primary frequency modulation device measuring point data, the transient state recording information database is used for storing various recording files, and the stored information comprises AGC action process recording, AVC action process recording, primary frequency modulation action process recording and primary frequency modulation action process fan recording.
And the data and wave recording file uploading module is used for the power supply side substation to send the sampled and preprocessed data to the dispatching end of the terminal side main station through the communication server of the dispatching ring network according to different specifications according to the importance degree, and the packed E text format files of various data are uploaded according to the information requirement and the data importance level according to different time intervals.
And the terminal main station analysis recording file module is used for receiving and analyzing the data transmitted by the substation by the terminal main station, extracting and restoring the received data such as the plant station operation data, the single-machine transient and steady state data, the action information and the like of the unit.
And the cloud data storage module is used for storing the received data file in a cloud server connected with the terminal side master station by the terminal side master station and forming a terminal side database.
The primary frequency modulation and inertia support evaluation module is used for calculating each performance index by the terminal side master station according to real-time and historical sampling data, comparing the calculation result with a standard evaluation index, and screening out an unqualified action process and an unqualified single machine; and establishing a mathematical model of the primary frequency modulation characteristic of the new energy, and calculating the primary frequency modulation supporting capacity of the new energy plant station by combining the theoretical power and the current output.
The power supply side substation, the communication server, the terminal side master station and the corresponding communication connection technology are not described herein again for the prior art.
Example 2:
as shown in fig. 3, the invention discloses a new energy network source coordinated frequency modulation and inertia online monitoring method, which comprises the steps of S1 power supply substation data preprocessing, S2 data and wave recording file uploading, and S3 terminal master station detection and analysis, wherein the step S1 power supply substation data preprocessing comprises the steps of S101 power supply substation data acquisition, S102 power supply substation data preprocessing, and S103 power supply substation database updating, and the step S3 terminal master station detection and analysis comprises the steps of S301 terminal master station wave recording file analysis, S302 cloud data storage, and S303 primary frequency modulation and inertia support evaluation.
S101 power supply substation data acquisition
The power supply side substation acquires various kinds of operation data such as primary frequency modulation device, single machine information, PMU, AGC, DCS, AVC and the like of the new energy plant station and obtains sampling data
S102 substation data preprocessing
And the power supply side substation performs time alignment local fusion arrangement on the acquired data, and performs preprocessing and packaging according to a requirement format to be sent. And processing and packaging the data in an E text format and a Comtrade format according to requirements to be sent.
S103 substation database update
The power supply side substation stores the operation data and the wave recording file in a database; the database comprises two sub-databases, namely a plant station basic information and operation information database and a network-related regulation transient state recording information database, wherein the plant station basic information and operation information database is used for storing plant station, equipment and single machine operation information, the stored information comprises single-fan sending information, grid-connected point information, current collecting line information, bus information, SVG equipment information, wind power plant information, environment monitor information, power prediction result information and primary frequency modulation device measuring point data, the transient state recording information database is used for storing various recording files, and the stored information comprises AGC action process recording, AVC action process recording, primary frequency modulation action process recording and primary frequency modulation action process fan recording.
S2 uploading data and recording files
The power supply side substation sends the sampled and preprocessed data to a dispatching end of the terminal side main station through a communication server of a dispatching ring network according to different specifications of importance degrees, and packed E text format files of various data are sent up according to different time intervals according to information requirements and data importance levels;
s301 terminal main station analyzes wave recording file
And the terminal side main station receives and analyzes the data transmitted by the sub-stations, and extracts and restores the data such as the plant station operation data, the single-machine transient and steady state data, the action information and the like of the unit.
S302 cloud data storage
And the terminal side master station stores the received data file in a cloud server connected with the terminal side master station and forms a terminal side database.
S303 primary frequency modulation and inertia support evaluation
The terminal side master station calculates each performance index according to real-time and historical sampling data, compares the calculation result with a standard assessment index, and screens out an unqualified action process and an unqualified single machine; and establishing a mathematical model for evaluating the primary frequency modulation and inertia support characteristics of the new energy, and calculating the primary frequency modulation and inertia support capability of the new energy plant station by combining theoretical power and current output.
And establishing a mathematical model of the primary frequency modulation characteristic of the new energy, and calculating the primary frequency modulation supporting capability of the new energy plant station by combining the rated power of the new energy single machine and the current output of the single machine.
The new energy plant station utilizes a corresponding active control system, a single inverter or a method of additionally installing an independent control device to realize active-frequency droop characteristic control, so that the frequency rapid adjustment capability of the new energy plant station at a grid-connected point is calculated according to the following formula:
wherein: f. ofdThe fast frequency response dead zone is in Hz.
fNIs the system nominal frequency in Hz.
PNRated power, unit MW.
And delta% is the fast frequency response difference rate of the new energy.
P0Is the initial value of active power in unit MW.
The evaluation calculation formula of the primary frequency modulation capability of the single new energy unit is as follows:
when the frequency f > 50+ DB action dead zone
Total regulating quantity of the photovoltaic power station:
load distribution of each inverter: a method based on capability allocation is employed.
The adjustment amount shared by the ith inverter is as follows:
when the frequency f is less than 50-DBDead zone of motionThe method comprises the following steps:
total regulating quantity of the photovoltaic power station:
the adjustment amount shared by the ith inverter is as follows:
When frequency is 50-DBDead zone of motion≤f≤50+DBDead zone of motionTime primary frequency modulation does not act
Wherein:
f is the system frequency; hz
PNRated power for the power station; MW
DB is a frequency dead zone calculation value, Hz, and the photovoltaic is generally 0.1Hz and can be set;
DBdead zone of motionOver 50+ -DB for fast frequency response motion dead bandDead zone of motionThe frequency modulation action is performed at the first time, and the photovoltaic frequency is generally 0.06 Hz;
DBpush-out four zonesExit of the dead band for fast frequency response, back to 50+ -DBExit dead zoneExiting the primary frequency modulation;
kδis the adjustment coefficient;
ΔPtotal PFCIs a primary frequency modulation regulating quantity;
Ppower capable of generatingActual power values of sample boards in the same area and model are obtained;
Pactual power 0iThe power value of the ith inverter at the moment when the frequency exceeds the dead zone, namely the moment 0, is unchanged in the whole frequency modulation process;
Pline lossFor line loss, the difference between the sum of active power of all inverters and the outgoing line power is generally taken and can be set;
note: the following suffix plus i denotes the ith inverter.
The new energy single machine can release or absorb electromagnetic power like a synchronous machine when facing frequency accidents by applying a control link, and the control mode is called virtual inertia control.
The conventional thermal power generating unit calculates the electromagnetic power margin which can be released or absorbed, namely the rotational inertia of the conventional thermal power generating unit, according to the rotor kinetic energy change in the system frequency change.
Setting the zero moment rotor speed as the rated speed omega0At time t, the variation of the kinetic energy of the rotor, i.e. the energy variation accumulated by the output electromagnetic power at times 0 to t, is:
and the electromagnetic power output at the time t is the differential of the energy:
wherein, Delta E (t) is the accumulated energy change of the rotor at the time of 0-t, and the unit is MW & h.
PeAnd (t) is the electromagnetic power output at the time t and has the unit of MW.
ω0The rated rotation speed of the rotor is shown in unit of rad/s.
ω (t) is the instantaneous rotational speed of the rotor in rad/s.
J is rotor moment of inertia in kg.m2。
And f (t) is the instantaneous frequency of the system in Hz.
The new energy plant station applies a virtual synchronous machine technology and provides a self-adaptive control algorithm for controlling the virtual rotor inertia to change in a self-adaptive mode according to different working conditions.
The virtual rotor inertia J value-taking principle adopted in the control scheme is as formula (6), and C is recorded as the threshold value of the angular speed change rate of the virtual rotor when
Taking J as the steady state value J of the inertia time constant0(ii) a When in
Then the value of J is determined by the adaptive control algorithm.
Wherein: k is a constant.
ωgThe unit is rad/s for the angular speed of the power grid.
Omega is the virtual angular velocity of the new energy plant station, and the unit is rad/s.
J is the virtual moment of inertia of the new energy plant station and has the unit of kg.m2。
J0For a set steady-state value of virtual moment of inertia, in kg m2。
Example 3:
as shown in fig. 1 and fig. 2, a new energy network source coordinated frequency modulation and inertia online monitoring method system includes a power supply side substation, a communication server, a terminal side master station, and related communication protocol conventions.
The power side substation is a CSC-850 programmable automation controller with multiple network ports, and is respectively connected with interfaces of equipment such as a PMU, a primary frequency modulation device, an AGC and the like and a communication server through a network connecting line and a hard node.
The communication server is an industrial server with a plurality of network ports. The minimum configuration requirements are 4 cores, 8 threads of CPU, 16G memory and 1T enterprise-level hard disk. And the communication server is respectively connected with the power supply side substation and the terminal side main station through a network connecting line and a power dispatching network. The communication server has data inquiry and data forwarding functions.
The main station at the terminal side is a front-end server and is configured in a D5000 machine room of the electric power regulation and control center. The minimum configuration requirements are 8 cores, 8 threads of CPU, 16G memory and 2 x 2T enterprise-level hard disk. The master station is provided with a database covering all single-machine operation data and has advanced application functions of primary frequency modulation prediction diagnosis, AGC evaluation and maintenance, on-line evaluation of peak-shaving capacity of the unit and the like.
After the application runs secretly for a period of time, the feedback of field technicians has the advantages that:
a new energy network source coordinated frequency modulation and inertia online monitoring system is developed for solving the problems that after new energy is connected into a network in a large scale, the primary frequency modulation capability of a power grid is insufficient, the system inertia is continuously reduced, a scheduling mechanism has a supervision blind area and the like.
According to the rotational inertia calculation method of the photovoltaic wind power single machine of the new energy station, the residual inertia margin can be calculated in real time according to the inversion angular speed of the new energy single machine and the virtual rotor inertia in the system frequency change, and the calculation result realizes the quantitative evaluation of the virtual rotational inertia of the new energy single machine.
An online calculation, analysis and evaluation method for the rotational inertia of a photovoltaic wind power single machine of a new energy station. The method is determined according to the new energy single machine inversion angular velocity and the virtual rotor inertia in the system frequency change.
In the self-adaptive virtual rotor inertia control method, the selection of the virtual inertia J of the new energy machine set is not limited by physical conditions, and different values can be selected according to actual requirements. The advantage that the virtual inertia of the new energy is adjusted quickly and flexibly can be fully exerted, and the problem of stability caused by reduction of the inertia of a power grid after the new energy is connected to the power grid on a large scale is effectively solved.
The new energy plant station frequency modulation and inertia support capacity online monitoring and analyzing system effectively realizes data acquisition and fusion of the power supply substation and the terminal main station, has strong information interaction universality, and makes up the monitoring blind area of the terminal main station on single machine information and plant station transient process information.
The power supply side substation has high data transmission precision and can meet the data requirement of application with high data precision requirement. One type of information such as single machine information, bus information, collecting wire information and the like is packaged into an E text format at a time interval of 5S for uploading, two types of information such as SVG equipment information and the like are packaged into the E text format at a time interval of 60S, three types of data such as environment monitor information, power prediction information and the like are packaged into the E text format at a time interval of 300S, and the wave recording of the action process of AGC, AVC and primary frequency modulation devices is in a Comtrade format with a data density of 20 ms.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; it is obvious as a person skilled in the art to combine several aspects of the invention. And such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a new forms of energy network source coordinate frequency modulation, inertia support on-line monitoring analytic system which characterized in that: the system comprises a power supply side substation, a communication server, a terminal side main station, a substation data acquisition module, a substation data preprocessing module, a substation database updating module, a data and wave recording file uploading module, a terminal main station wave recording file analyzing module, a cloud data storage module and a primary frequency modulation and inertia support evaluation module;
the power supply side substation is connected with the terminal side main station through the communication server and communicates with the terminal side main station; the substation carries out local storage data fusion on the collected primary frequency modulation device, stand-alone information, PMU, AGC, DCS, AVC, telecontrol device, power prediction running data waveform and station control level instruction information, and sends the data to a terminal side main station through a communication server, and the main station processes, calculates and examines the data on line, so that the main station can remotely monitor and evaluate the running state parameters, frequency modulation supporting capability and inertia supporting capability of the whole substation, an electric wire and a stand-alone of the substation.
2. The new energy network source coordination frequency modulation and inertia support online monitoring and analysis system according to claim 1, characterized in that: the power supply substation data acquisition module is used for the power supply side substation to acquire various kinds of operation data of a primary frequency modulation device, single machine information, a PMU (phasor measurement Unit), an AGC (automatic gain control), a DCS (distributed control System) and an AVC (automatic Voltage control) of the new energy plant station and acquire sampling data;
the substation data preprocessing module is used for the power supply side substation to perform time alignment local fusion and arrangement on the acquired data, and perform preprocessing and packaging according to a required format to be sent;
the substation database updating module is used for the power supply side substation to store the operation data and the wave recording file in the database;
the database comprises two sub-databases, namely a plant station basic information and operation information database and a network-related regulation transient state recording information database, wherein the plant station basic information and operation information database is used for storing plant station, equipment and single machine operation information, the stored information comprises single-fan sending information, grid-connected point information, current collecting line information, bus information, SVG equipment information, wind power plant information, environment monitor information, power prediction result information and primary frequency modulation device measuring point data, the transient state recording information database is used for storing various recording files, and the stored information comprises AGC action process recording, AVC action process recording, primary frequency modulation action process recording and primary frequency modulation action process fan recording;
the data and wave recording file uploading module is used for the power supply side substation to send the sampled and preprocessed data to the dispatching end of the terminal side main station through the communication server of the dispatching ring network according to different specifications of importance degrees;
the terminal main station analysis recording file module is used for receiving and analyzing the data transmitted by the substation by the terminal main station, extracting and restoring the received data such as the plant station operation data, the single-machine transient and steady state data, the action information and the like of the unit;
the cloud data storage module is used for the terminal side master station to store the received data file in a cloud server connected with the terminal side master station and form a terminal side database;
the primary frequency modulation and inertia support evaluation module is used for calculating each performance index by the terminal side master station according to real-time and historical sampling data, comparing the calculation result with a standard evaluation index, and screening out an unqualified action process and an unqualified single machine; and establishing a mathematical model for evaluating the primary frequency modulation and inertia support characteristics of the new energy, and calculating the primary frequency modulation and inertia support capability of the new energy plant station by combining theoretical power and current output.
3. A new energy network source coordination frequency modulation and inertia support online monitoring and analysis method is characterized by comprising the following steps:
step S1, preprocessing the substation data;
step S2, uploading data and wave recording files;
and step S3, detecting and analyzing by the terminal main station.
4. The new energy network source coordinated frequency modulation and inertia support online monitoring and analysis method according to claim 3, wherein in the step of uploading the S2 data and the recording file, the power supply side substation transmits the data after sampling preprocessing to the scheduling end of the terminal side main station through the communication server of the scheduling ring network according to different specifications of importance degrees.
5. The new energy network source coordination frequency modulation and inertia support online monitoring and analysis method according to claim 3, wherein the step S1 of preprocessing the substation data comprises:
s101, acquiring substation data;
s102, preprocessing substation data;
and S103, updating the substation database.
6. The new energy network source coordinated frequency modulation and inertia support online monitoring and analysis method of claim 5, characterized in that in the step of S101 substation data acquisition, the power side substation acquires various types of operation data of the primary frequency modulation device, stand-alone information, PMU, AGC, DCS, and VC of the new energy plant and obtains sampling data.
7. The new energy network source coordination frequency modulation and inertia support online monitoring and analysis method according to claim 5, wherein in the step of S102 substation data preprocessing, the power supply side substation performs time alignment local fusion and arrangement on the acquired data, and performs preprocessing and packaging according to a required format to be sent.
8. The new energy network source coordination frequency modulation and inertia support online monitoring and analysis method according to claim 5, wherein in the step of updating the database of the S103 substation, the power supply side substation stores the operation data and the recording file in the database; the database comprises two sub-databases, namely a plant station basic information and operation information database and a network-related regulation transient state recording information database, wherein the plant station basic information and operation information database is used for storing plant stations, equipment and single machine operation information, the stored information comprises single-fan sending information, grid-connected point information, current collecting line information, bus information, SVG equipment information, wind power plant information, environment monitor information, power prediction result information and primary frequency modulation device measuring point data, the transient state recording information database is used for storing various recording files, and the stored information comprises AGC action process recording, AVC action process recording, primary frequency modulation action process recording and primary frequency modulation action process fan recording.
9. The new energy network source coordination frequency modulation and inertia support online monitoring and analysis method according to claim 3, wherein the step S3 of detecting and analyzing the terminal master station comprises:
s301, the terminal master station analyzes the wave recording file;
s302, cloud data storage;
and S303, primary frequency modulation and inertia support evaluation.
10. The new energy network source coordinated frequency modulation and inertia support online monitoring and analysis method according to claim 9, characterized in that in the step of analyzing the wave recording file by the terminal master station of S301, the terminal side master station receives and analyzes the data transmitted by the substation, extracts and restores plant station operation data, stand-alone transient and steady state data and action information data of the unit;
in the step of S302 cloud data storage, the terminal side master station stores the received data file in a cloud server connected with the terminal side master station and forms a terminal side database;
in the step of S303 primary frequency modulation and inertia support evaluation, the terminal side master station calculates each performance index according to real-time and historical sampling data, compares the calculation result with the standard evaluation index, and screens out unqualified action processes and unqualified single machines.
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