CN115036943A - Wind power plant primary frequency modulation system - Google Patents
Wind power plant primary frequency modulation system Download PDFInfo
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- CN115036943A CN115036943A CN202210958454.4A CN202210958454A CN115036943A CN 115036943 A CN115036943 A CN 115036943A CN 202210958454 A CN202210958454 A CN 202210958454A CN 115036943 A CN115036943 A CN 115036943A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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
- H02J2300/28—The renewable source being wind energy
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The application provides a wind power plant primary frequency modulation system, which adopts a primary frequency modulation device to send fan power regulation data to a plurality of fans in a wind power plant through an energy management platform, avoids the conflict between the sending time and the output power response time by adding the output power response time of each fan into the sending time of the fan power regulation data, ensures the sequential execution of the fan power regulation data, calculates the average value of the frequency in an abnormal frequency range in the primary frequency modulation device, eliminates the abnormal data in the frequency according to the calculation result, improves the stability of the frequency data, calculates the power regulation data sent to the energy management platform according to a line loss function in the primary frequency modulation device, avoids the influence of line loss on the power sent to a wind power plant grid-connected point by the fans, and improves the accuracy of the primary frequency modulation process, the adjustment time in the primary frequency modulation process is reduced.
Description
Technical Field
The application relates to the technical field of new energy grid connection, in particular to a primary frequency modulation system of a wind power plant.
Background
In recent years, with the increasing proportion of the installed capacity of wind power to the total installed capacity of a power grid, the operation form of the power grid is changed remarkably due to the power electronic characteristics of wind power generation. Meanwhile, because the rotation inertia of the wind power plant is small, the frequency change of the power grid cannot be fed back quickly and effectively only by means of an Automatic Generation Control (AGC) secondary frequency modulation technology, and many challenges are brought to the safe operation of the power grid.
Generally, a wind power plant has primary frequency modulation capability which is an important condition for being a friendly power supply, and a primary frequency modulation algorithm strategy is started by monitoring the grid-connected point frequency of the wind power plant and when the frequency fluctuation exceeds a safe dead zone, so that the wind power plant outputs corresponding power to provide support for the recovery of the frequency. However, the adjustment of the power grid frequency has high requirements on accuracy and timeliness, and the primary frequency modulation algorithm of the traditional power generation mode cannot be directly applied to the primary frequency modulation of the wind power plant with low rotational inertia.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a wind farm primary frequency modulation system, which is used to solve or partially solve the above technical problems.
Based on above-mentioned purpose, this application provides a wind-powered electricity generation field primary frequency modulation system, includes:
the system comprises a secondary frequency modulation device, a telecontrol device, a primary frequency modulation device, a monitoring device, a voltage and current acquisition device, an energy management platform, a plurality of fans and a wind farm grid-connected point, wherein the primary frequency modulation device is respectively in communication connection with the secondary frequency modulation device, the telecontrol device, the monitoring device, the voltage and current acquisition device and the energy management platform;
the energy management platform is configured to receive power adjustment data sent by the primary frequency modulation device, and convert the power adjustment data into fan power adjustment data according to the rated power of the fans, wherein the fan power adjustment data is an output power reference value of each fan in the fans;
the energy management platform comprises:
an obtaining time parameter module configured to obtain an execution time parameter of each of the plurality of fans, wherein the execution time parameter is determined according to an output power response time of each of the plurality of fans;
the obtaining timestamp module is configured to obtain an adjusting timestamp of the last fan power adjusting data corresponding to the fan power adjusting data;
a transmission power adjustment data module configured to transmit fan power adjustment data to each of the plurality of fans according to a transmission time, where a sum of the adjustment timestamp and the execution time parameter is used as the transmission time of the fan power adjustment data;
the voltage and current acquisition device is configured to acquire voltage and current data of the wind power plant grid-connected point, record an acquisition timestamp and send the voltage and current data and the acquisition timestamp to the primary frequency modulation device through a hard wire;
the primary frequency modulation device includes:
an acquisition frequency module configured to determine a first frequency from the voltage current data; in response to determining that the first frequency is within a preset abnormal frequency range, acquiring a second frequency set corresponding to a predetermined number of a plurality of acquisition timestamps, wherein the plurality of acquisition timestamps include an acquisition timestamp of the first frequency; in response to determining that the average of the frequencies in the second set of frequencies is not within an abnormal frequency range, taking a last frequency corresponding to the first frequency as the real-time frequency; in response to determining that an average of the frequencies in the second set of frequencies is within an abnormal frequency range, treating the first frequency as a real-time frequency;
the obtaining power module is configured to determine real-time power of the wind power plant grid-connected point according to the voltage and current data;
a wave recording module configured to respond to the fact that the real-time frequency is not within a preset adjusting frequency range, send a blocking signal to the secondary frequency modulation device according to the secondary frequency modulation data, and start wave recording;
the power regulation data acquisition module is configured to respond to the fact that the real-time frequency is not in the regulation frequency range, determine initial power regulation data through a difference regulation curve according to the real-time frequency and the real-time power, acquire a line loss function of the wind turbine to the wind power plant grid-connected point, calculate power regulation data corresponding to the initial power regulation data according to the line loss function, and send the power regulation data to the energy management platform for primary frequency regulation;
the frequency modulation stopping module is configured to determine an adjusting frequency after the primary frequency modulation according to the voltage and current data after the primary frequency modulation, and in response to determining that the adjusting frequency is within the adjusting frequency range, stop recording and send an unlocking signal to the secondary frequency modulation device.
From the above, it can be seen that the wind farm primary frequency modulation system provided by the application adopts the primary frequency modulation device to transmit the fan power adjustment data to the plurality of fans in the wind farm through the energy management platform, avoids the conflict between the transmission time and the output power response time by adding the execution time parameter of each fan into the transmission time for transmitting the fan power adjustment data, ensures the sequential execution of the plurality of fan power adjustment data, calculates the average value of the frequency in the abnormal frequency range in the primary frequency modulation device, eliminates the abnormal data in the frequency according to the calculation result, improves the stability of the frequency data, calculates the power adjustment data transmitted to the energy management platform according to the line loss function in the primary frequency modulation device, avoids the influence of the line loss on the power transmitted to the wind farm parallel nodes by the plurality of fans, and improves the accuracy of the primary frequency modulation process, the adjustment time in the primary frequency modulation process is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for the embodiments or related technologies in the following description are briefly introduced, and it is obvious that the drawings in the following description are only the embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1a is a schematic structural diagram of a primary frequency modulation system of a wind power plant according to an embodiment of the application;
FIG. 1b is a schematic structural diagram of an energy management platform according to an embodiment of the present application;
fig. 1c is a schematic structural diagram of a primary frequency modulation device according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to specific embodiments and the accompanying drawings.
It should be noted that technical terms or scientific terms used in the embodiments of the present application should have a general meaning as understood by those having ordinary skill in the art to which the present application belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In some embodiments, as shown in fig. 1a, a wind farm primary frequency modulation system 100 comprises: the system comprises an energy management platform 110, a voltage and current acquisition device 120, a primary frequency modulation device 130, a secondary frequency modulation device 140, a telecontrol device 150, a monitoring device 160, a plurality of fans 170 and a wind power plant grid-connected point 180, wherein the primary frequency modulation device 130 is in communication connection with the secondary frequency modulation device 140, the telecontrol device 150, the monitoring device 160, the voltage and current acquisition device 120 and the energy management platform 110 respectively, the energy management platform 110 is in communication connection with the fans 170, and the fans are in electrical connection with the wind power plant grid-connected point.
The energy management platform 110 is configured to receive power adjustment data sent by the primary frequency modulation device 130, and convert the power adjustment data into fan power adjustment data according to the rated power of the plurality of fans 170, where the fan power adjustment data is an output power reference value of each of the plurality of fans 170;
as shown in fig. 1b, the energy management platform 110 includes:
an obtaining time parameter module 111 configured to obtain an execution time parameter of each of the plurality of fans 170, wherein the execution time parameter is determined according to an output power response time of each of the plurality of fans 170;
an obtaining timestamp module 112 configured to obtain an adjusting timestamp of the last fan power adjusting data corresponding to the fan power adjusting data;
a transmission power adjustment data module 113 configured to transmit the fan power adjustment data to each of the plurality of fans according to a transmission time of the fan power adjustment data, which is a sum of the adjustment timestamp and the execution time parameter.
In the above solution, the energy management platform 110 refers to a computer system capable of managing power output of a plurality of wind turbines 170, the energy management platform 110 in this embodiment may be a management system configured by a manufacturer of the plurality of wind turbines 170, the execution time parameter refers to a time when the wind turbines respond to the output power command, and the execution time parameter in this embodiment may be a time when the wind turbines respond to the wind turbine power adjustment data sent by the energy management platform 110.
The adjustment timestamp refers to a time point when the fan receives the output power instruction, the adjustment timestamp in this embodiment may be a time point when the fan receives the fan power adjustment data sent by the energy management platform 110, the sending time refers to a time point when the output power instruction is sent to the fan, and the sending time in this embodiment may be a time point when the energy management platform 110 sends the fan power adjustment data to the fan.
For example, the adjusting time stamp of fan adjusting data on a ModBus protocol (a serial communication protocol) is 2019-08-0617: 59:34:215, the execution time parameter of the fan is 200ms, and the sending time of the fan power adjusting data is 2019-08-0617: 59:34: 415.
Thus, by adding the execution time parameter of each fan into the sending time, the conflict between the sending time and the output power response time is avoided, the sequential execution of the power regulation data of a plurality of fans is ensured,
the voltage and current collecting device 120 is configured to collect voltage and current data of the wind power plant grid-connected point and record a collecting timestamp, and send the voltage and current data and the collecting timestamp to the primary frequency modulation device through hard wiring.
In the above solution, the voltage and current data refers to data that can be calculated to obtain the first frequency, real-time power and power factor, and the preferred voltage and current data in this embodiment may be instantaneous voltage frequency, instantaneous voltage, instantaneous current, voltage phase angle and current phase angle collected by the voltage and current collecting device 120.
The collection time stamp refers to a time point corresponding to the collected voltage and current data, and the preferred collection time stamp of this embodiment may be a time point corresponding to the voltage and current data collected by the voltage and current collecting device 120.
For example, the instantaneous voltage frequency is taken as the first frequency, the active power calculated from the instantaneous voltage and the instantaneous current is taken as the real-time power, and the cosine of the difference between the voltage phase angle and the current phase angle is taken as the power factor. This provides a data basis for the primary tuning process of the primary tuning device 130.
As shown in fig. 1c, the primary frequency modulation device 130 includes:
an acquisition frequency module 131 configured to determine a first frequency from the voltage current data; in response to determining that the first frequency is within a preset abnormal frequency range, acquiring a second frequency set corresponding to a predetermined number of a plurality of acquisition timestamps, wherein the plurality of acquisition timestamps include an acquisition timestamp of the first frequency; in response to determining that the average of the frequencies in the second set of frequencies is not within an abnormal frequency range, taking a last frequency corresponding to the first frequency as the real-time frequency; in response to determining that an average of the frequencies in the second set of frequencies is within an abnormal frequency range, treating the first frequency as a real-time frequency;
a get power module 132 configured to determine real-time power of the wind farm grid-tie point 180 from the voltage current data;
a recording module 133 configured to, in response to determining that the real-time frequency is not within the preset adjustment frequency range, transmit a blocking signal to the secondary frequency modulation device 140 according to the secondary frequency modulation data and start recording;
a power adjustment data obtaining module 134, configured to, in response to determining that the real-time frequency is not within the adjustment frequency range, determine initial power adjustment data according to the real-time frequency and the real-time power through a difference adjustment curve, obtain a line loss function from the multiple wind turbines 170 to the wind farm grid-connected point 180, calculate power adjustment data corresponding to the initial power adjustment data according to the line loss function, and send the power adjustment data to the energy management platform 110 for primary frequency modulation;
a stop fm module 135 configured to determine the adjusted primary frequency from the voltage-current data, to stop recording and to send an unlock signal to the secondary fm device 140 in response to determining that the adjusted primary frequency is within the adjusted frequency range.
In the above solution, the first frequency refers to a frequency directly determined according to the voltage-current data, and the preferred first frequency of the present embodiment may be a voltage frequency directly determined according to the voltage-current data. The abnormal frequency range refers to a frequency range caused by large disturbance of a power grid or a frequency range caused by collection errors, and the preferred abnormal frequency range in the embodiment may be an abnormal frequency range of the wind farm grid-connected point 180.
The second frequency set refers to a frequency set including a plurality of acquisition timestamps, and the preferred second frequency set in this embodiment may be a frequency set corresponding to a plurality of consecutive acquisition timestamps before the first acquisition timestamp, where the first acquisition timestamp is the acquisition timestamp corresponding to the first frequency.
Specifically, for example, if the first frequency is 37Hz, the collection time stamps of the first frequency are 2019-08-0617: 59:34:215, and the abnormal frequency range is ± 5 to 20Hz of the rated frequency 50Hz of the power grid, a second frequency set (50, 50, 50, 50, 37) corresponding to the 5 collection time stamps is obtained, and if the average frequency value of the second frequency set is 47.4Hz, the last frequency 50Hz corresponding to the first frequency is used as the real-time frequency.
In this way, the primary frequency modulation device calculates the average value of the frequencies in the abnormal frequency range, eliminates abnormal data in the frequencies according to the calculation result, and improves the stability of the frequency data.
The adjustment frequency range refers to a frequency range requiring power transmitted by the wind farm, and the preferred adjustment frequency range of the present embodiment may be a frequency range requiring power transmitted by the wind farm through the wind farm grid-connected point 180. The difference adjustment curve refers to a relation curve of frequency and power, and a preferred difference adjustment curve of the present embodiment may be a straight line with a certain slope, where the frequency and the power are in one-to-one correspondence.
The initial power regulation data refers to power obtained through a difference regulation curve according to real-time frequency and real-time power, and the embodiment preferably enables the frequency which is not in the regulation frequency range to recover the power transmitted by the wind power plant of the rated frequency through the wind power plant grid-connected point. The power adjustment data refers to the sum of initial power adjustment data and power loss, and the preferred power adjustment data of the present embodiment may be the sum of initial power adjustment data and line loss.
Specifically, for example, the initial power adjustment data calculated according to the difference adjustment curve is 100kW, the corresponding line loss when the grid-connected point of the wind farm receives 100kW of power according to the line loss function is 3kW, and then the power adjustment data of the multiple fans is 103 kW.
In this way, the power regulation data sent to the energy management platform 110 is calculated in the primary frequency modulation device 130 according to the line loss function, so that the influence of line loss on the power sent to the wind power plant grid-connected point by a plurality of fans is avoided, the accuracy of the primary frequency modulation process is improved, and the regulation time in the primary frequency modulation process is shortened.
By the scheme, the primary frequency modulation device 130 is adopted to send the fan power regulation data to the fans 180 in the wind power plant through the energy management platform 110, the conflict between the sending time and the output power response time is avoided by adding the execution time parameter of each fan into the sending time for sending the fan power regulation data, the sequential execution of the fan power regulation data is ensured, the average value calculation is carried out on the frequency in the abnormal frequency range in the primary frequency modulation device 130, the abnormal data in the frequency is eliminated according to the calculation result, the stability of the frequency data is improved, the power regulation data sent to the energy management platform 110 is calculated according to the line loss function in the primary frequency modulation device 130, the influence of line loss on the power sent to the wind power plant grid-connected point 180 by the fans 170 is avoided, and the accuracy of the primary frequency modulation process is improved, the adjustment time in the primary frequency modulation process is reduced.
In some embodiments, the obtain power adjustment data module 134 is specifically configured to:
calculating the line loss function according to:
ΔP=(P/U*cosφ) 2 *R，
where Δ P is line loss power from the plurality of wind turbines 170 to the wind farm grid-connected point 180, P is transmission power from the plurality of wind turbines 170 to the wind farm grid-connected point 180, U is output voltage of the plurality of wind turbines 170, cos Φ is a power factor corresponding to the transmission power, and R is resistance from the plurality of wind turbines 170 to the wind farm grid-connected point 180.
Through the scheme, a function basis is provided for line loss calculation corresponding to subsequent power regulation data.
In some embodiments, the obtain power adjustment data module 134 is further configured to:
calculating power adjustment data corresponding to the initial power adjustment data according to the following formula:
P 2 =P 1 +(P 2 /U*cosφ) 2 *R，
wherein, P 1 For the initial power adjustment data, P 2 For the power adjustment data, U is the output voltage of the plurality of wind turbines 170, cos Φ is the power factor corresponding to the initial power adjustment data, and R is the resistance from the plurality of wind turbines 170 to the wind farm grid-connected point 180.
Through the scheme, a calculation basis is provided for acquiring the power regulation data.
In some embodiments, the obtain power adjustment data module 134 is further specifically configured to:
calculating initial power adjustment data according to:
P 1 =P 0 -P N *(f-f d )/(f N *δ)，
wherein, P 1 For the initial power adjustment data, P 0 For said real-time power, P N Is the rated power of the plurality of fans 170, f is the real-time frequency, f d For the boundary frequency, f, corresponding to the adjustment frequency range N For the frequency rating, δ is the rate of difference.
Through the scheme, a data basis is provided for the calculation of subsequent power regulation data.
In some embodiments, the acquiring frequency module 131 is specifically further configured to: the abnormal frequency range is +/-5-20 Hz of the rated frequency of the power grid.
Through the scheme, a data basis is provided for improving the stability of the real-time frequency in the primary frequency modulation device 130.
In some embodiments, the wave recording module 133 is further specifically configured to: the adjusting frequency range is +/-0.03-0.06 Hz of the rated frequency of the power grid.
Through the scheme, a data basis is provided for improving the stability of the real-time frequency in the primary frequency modulation device 130.
In some embodiments, the secondary frequency modulation device 140 is configured to transmit secondary frequency modulation data to the primary frequency modulation device 130.
In the above solution, the chirp data refers to power adjustment data transmitted to the primary chirp device 130, and the preferred chirp data of the present embodiment may be power adjustment data transmitted by the secondary chirp device 140 to the primary chirp device 130.
Through the scheme, the influence of the secondary frequency modulation process on the primary frequency modulation process is avoided.
In some embodiments, the remote control device 150 is configured to transmit a remote control request to the primary fm device 130, and receive remote control response data transmitted by the primary fm device.
In the above scheme, the telecontrol request refers to a data request sent by a higher-level unit corresponding to the wind farm, and the telecontrol request in this embodiment may be a data request sent by a power grid where the wind farm grid-connected point 180 is located.
Through the scheme, the primary frequency modulation device 130 realizes data interaction with the upper unit of the wind power plant.
In some embodiments, the monitoring device 160 is configured to transmit a monitoring request to the primary fm device 130 and receive monitoring response data transmitted by the primary fm device 130.
In the above solution, the monitoring request refers to a data request sent by a wind farm, and a preferable telecontrol request in this embodiment may be a data request sent by the monitoring device 160 in the wind farm.
Through the scheme, the primary frequency modulation device 130 realizes data interaction with the wind power plant monitoring device.
In some embodiments, the plurality of wind turbines 170 are configured to output power corresponding to the wind turbine power adjustment data to the wind farm grid-tie point 180.
For convenience of description, the above devices are described as being divided into various modules by functions, which are described separately. Of course, the functionality of the various modules may be implemented in the same one or more software and/or hardware implementations as the present application.
Based on the same inventive concept, corresponding to the method of any embodiment, the application also provides a primary frequency modulation method for the wind power plant.
The wind power plant primary frequency modulation method is applied to a wind power plant primary frequency modulation system, and the system comprises: the system comprises a secondary frequency modulation device, a telecontrol device, a primary frequency modulation device, a monitoring device, a voltage and current acquisition device, an energy management platform, a plurality of fans and a wind farm grid-connected point, wherein the primary frequency modulation device is respectively in communication connection with the secondary frequency modulation device, the telecontrol device, the monitoring device, the voltage and current acquisition device and the energy management platform; the method comprises the following steps:
receiving power regulation data sent by the primary frequency modulation device through the energy management platform, and converting the power regulation data into fan power regulation data according to the rated power of the fans, wherein the fan power regulation data are output power reference values of each fan in the fans;
acquiring execution time parameters of the plurality of fans through an acquisition time parameter module in the energy management platform, wherein the execution time parameters are determined according to output power response time of the plurality of fans;
acquiring an adjusting timestamp of the last fan power adjusting data corresponding to the fan power adjusting data through an acquiring timestamp module in the energy management platform;
taking the sum of the adjusting timestamp and the execution time parameter as the sending time of the fan power adjusting data through a sending power adjusting data module in the energy management platform, and sending the fan power adjusting data to the fans according to the sending time;
acquiring voltage and current data of a grid-connected point of the wind power plant through the voltage and current acquisition device, recording an acquisition timestamp, and sending the voltage and current data and the acquisition timestamp to the primary frequency modulation device through a hard wire;
determining a first frequency according to the voltage and current data through a frequency acquisition module in the primary frequency modulation device; in response to determining that the first frequency is within a preset abnormal frequency range, acquiring a second frequency set corresponding to a predetermined number of a plurality of acquisition timestamps, wherein the plurality of acquisition timestamps include an acquisition timestamp of the first frequency; in response to determining that the average of the frequencies in the second set of frequencies is not within an abnormal frequency range, taking a last frequency corresponding to the first frequency as the real-time frequency; in response to determining that an average of the frequencies in the second set of frequencies is within an abnormal frequency range, treating the first frequency as a real-time frequency;
determining the real-time power of the grid-connected point of the wind power plant according to the voltage and current data through a power acquisition module in the primary frequency modulation device;
responding to the fact that the real-time frequency is not within a preset adjusting frequency range through a wave recording module in the primary frequency modulation device, sending a blocking signal to the secondary frequency modulation device according to the secondary frequency modulation data, and starting wave recording;
responding to the fact that the real-time frequency is not within the adjusting frequency range through a power adjusting data obtaining module in the primary frequency modulation device, determining initial power adjusting data through a difference adjusting curve according to the real-time frequency and the real-time power, obtaining a line loss function from the fan to a grid-connected point of the wind power plant, calculating power adjusting data corresponding to the initial power adjusting data according to the line loss function, and sending the power adjusting data to the energy management platform for primary frequency modulation;
determining the adjustment frequency after the primary frequency modulation according to the voltage and current data after the primary frequency modulation through a frequency modulation stopping module in the primary frequency modulation device, and stopping recording and sending an unlocking signal to the secondary frequency modulation device in response to the fact that the adjustment frequency is determined to be within the adjustment frequency range.
Calculating the line loss function according to:
ΔP=(P/U*cosφ) 2 *R，
the method comprises the steps that delta P is line loss power from a plurality of fans to a wind power plant grid-connected point, P is transmission power from the plurality of fans to the wind power plant grid-connected point, U is output voltage of the plurality of fans, cos phi is a power factor corresponding to the transmission power, and R is resistance from the plurality of fans to the wind power plant grid-connected point.
In some embodiments, the power adjustment data corresponding to the initial power adjustment data is calculated according to the following equation:
P 2 =P 1 -(P 1 /U*cosφ) 2 *R，
wherein, P 1 For the initial power adjustment data, P 2 And for the power regulation data, U is the output voltage of the fans, cos phi is the power factor corresponding to the initial power regulation data, and R is the resistance from the fans to the wind power plant grid-connected point.
In some embodiments, the initial power adjustment data is calculated according to the following equation:
P 1 =P 0 -P N *(f-f d )/(f N *δ)，
wherein, P 1 Adjusting data, P, for the initial power 0 For said real-time power, P N Is rated power of the plurality of fans, f is the real-time frequency, f d A boundary frequency f corresponding to the adjustment frequency range N For the frequency rating, δ is the rate of difference.
In some embodiments, the anomalous frequency range is ± 5-20 Hz.
In some embodiments, the adjustment frequency range is + -0.03-0.06 Hz.
In some embodiments, secondary frequency modulation data is transmitted to the primary frequency modulation device by the secondary frequency modulation device.
In some embodiments, a telecontrol request is sent to the primary frequency modulation device through the telecontrol device, and telecontrol response data sent by the primary frequency modulation device is received.
In some embodiments, a monitoring request is sent to the primary frequency modulation device by the monitoring device, and monitoring response data sent by the primary frequency modulation device is received.
In some embodiments, power corresponding to the wind turbine power adjustment data is output to the wind farm grid-tie point by the plurality of wind turbines.
It should be noted that the method of the embodiment of the present application may be executed by a single device, such as a computer or a server. The method of the embodiment can also be applied to a distributed scene and is completed by the mutual cooperation of a plurality of devices. In such a distributed scenario, one of the multiple devices may only perform one or more steps of the method of the embodiment, and the multiple devices interact with each other to complete the method.
It should be noted that the foregoing describes some embodiments of the present application. In some cases, the actions or steps recited in the specification may be performed in an order different than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The method of the embodiment can be applied to the corresponding wind farm primary frequency modulation system in any one of the embodiments, and has the beneficial effects of the corresponding system embodiment, which are not described herein again.
Based on the same inventive concept, corresponding to the method of any embodiment, the application further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and when the processor executes the program, the primary frequency modulation method for the wind farm according to any embodiment is implemented.
Fig. 2 is a schematic diagram illustrating a more specific hardware structure of an electronic device according to this embodiment, where the electronic device may include: a processor 1010, a memory 1020, an input/output interface 1030, a communication interface 1040, and a bus 1050. Wherein the processor 1010, memory 1020, input/output interface 1030, and communication interface 1040 are communicatively coupled to each other within the device via bus 1050.
The processor 1010 may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits, and is configured to execute related programs to implement the technical solutions provided in the embodiments of the present disclosure.
The Memory 1020 may be implemented in the form of a ROM (Read Only Memory), a RAM (Random Access Memory), a static storage device, a dynamic storage device, or the like. The memory 1020 may store an operating system and other application programs, and when the technical solution provided by the embodiments of the present specification is implemented by software or firmware, the relevant program codes are stored in the memory 1020 and called to be executed by the processor 1010.
The input/output interface 1030 is used for connecting an input/output module to input and output information. The i/o module may be configured as a component in a device (not shown) or may be external to the device to provide a corresponding function. The input devices may include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output devices may include a display, a speaker, a vibrator, an indicator light, etc.
The communication interface 1040 is used for connecting a communication module (not shown in the drawings) to implement communication interaction between the present device and other devices. The communication module can realize communication in a wired mode (such as USB, network cable and the like) and also can realize communication in a wireless mode (such as mobile network, WIFI, Bluetooth and the like).
It should be noted that although the above-mentioned device only shows the processor 1010, the memory 1020, the input/output interface 1030, the communication interface 1040 and the bus 1050, in a specific implementation, the device may also include other components necessary for normal operation. In addition, those skilled in the art will appreciate that the above-described apparatus may also include only those components necessary to implement the embodiments of the present description, and not necessarily all of the components shown in the figures.
The electronic device of the above embodiment is used for implementing the corresponding wind farm primary frequency modulation method in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which are not described herein again.
Based on the same inventive concept, corresponding to any of the above-mentioned embodiment methods, the present application further provides a non-transitory computer-readable storage medium storing computer instructions for causing the computer to execute the wind farm primary frequency modulation method according to any of the above embodiments.
Computer-readable media, including both permanent and non-permanent, removable and non-removable media, for storing information may be implemented in any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.
The computer instructions stored in the storage medium of the above embodiment are used to enable the computer to execute the wind farm primary frequency modulation method according to any of the above embodiments, and have the beneficial effects of the corresponding method embodiment, which are not described herein again.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the context of the present application, features from the above embodiments or from different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of brevity.
In addition, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown in the provided figures for simplicity of illustration and discussion, and so as not to obscure the embodiments of the application. Furthermore, devices may be shown in block diagram form in order to avoid obscuring embodiments of the application, and this also takes into account the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the embodiments of the application are to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the application, it should be apparent to one skilled in the art that the embodiments of the application can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments.
The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalents, improvements, and the like that may be made without departing from the spirit or scope of the embodiments of the present application are intended to be included within the scope of the claims.
Claims (10)
1. A wind-powered electricity generation field primary frequency modulation system which characterized in that includes:
the system comprises a secondary frequency modulation device, a telecontrol device, a primary frequency modulation device, a monitoring device, a voltage and current acquisition device, an energy management platform, a plurality of fans and a wind farm grid-connected point, wherein the primary frequency modulation device is respectively in communication connection with the secondary frequency modulation device, the telecontrol device, the monitoring device, the voltage and current acquisition device and the energy management platform;
the energy management platform is configured to receive power adjustment data sent by the primary frequency modulation device, and convert the power adjustment data into fan power adjustment data according to the rated power of the fans, wherein the fan power adjustment data is an output power reference value of each fan in the fans;
the energy management platform comprises:
an obtaining time parameter module configured to obtain an execution time parameter of the plurality of fans, wherein the execution time parameter is determined according to output power response times of the plurality of fans;
the obtaining timestamp module is configured to obtain an adjusting timestamp of the last fan power adjusting data corresponding to the fan power adjusting data;
a transmission power adjustment data module configured to transmit fan power adjustment data to the plurality of fans according to a transmission time of the fan power adjustment data, the transmission time being a sum of the adjustment timestamp and the execution time parameter;
the voltage and current acquisition device is configured to acquire voltage and current data of the wind power plant grid-connected point, record an acquisition timestamp and send the voltage and current data and the acquisition timestamp to the primary frequency modulation device through a hard wire;
the primary frequency modulation device includes:
an acquisition frequency module configured to determine a first frequency from the voltage current data; in response to determining that the first frequency is within a preset abnormal frequency range, acquiring a second frequency set corresponding to a predetermined number of a plurality of acquisition timestamps, wherein the plurality of acquisition timestamps include an acquisition timestamp of the first frequency; in response to determining that the average of the frequencies in the second set of frequencies is not within the abnormal frequency range, taking the last frequency corresponding to the first frequency as a real-time frequency; in response to determining that an average of the frequencies in the second set of frequencies is within an abnormal frequency range, treating the first frequency as a real-time frequency;
the obtaining power module is configured to determine real-time power of the wind power plant grid-connected point according to the voltage and current data;
the wave recording module is configured to respond to the fact that the real-time frequency is not within a preset adjusting frequency range, send a blocking signal to the secondary frequency modulation device according to the secondary frequency modulation data, and start wave recording;
the power regulation data acquisition module is configured to respond to the fact that the real-time frequency is not within the regulation frequency range, determine initial power regulation data through a difference regulation curve according to the real-time frequency and the real-time power, acquire a line loss function of the wind power plant grid-connected point from the plurality of fans, calculate power regulation data corresponding to the initial power regulation data according to the line loss function, and send the power regulation data to the energy management platform for primary frequency modulation;
the frequency modulation stopping module is configured to determine an adjusting frequency after the primary frequency modulation according to the voltage and current data after the primary frequency modulation, and in response to determining that the adjusting frequency is within the adjusting frequency range, stop recording and send an unlocking signal to the secondary frequency modulation device.
2. The system of claim 1, wherein the obtain power adjustment data module is specifically configured to:
calculating the line loss function according to the following formula:
ΔP=(P/U*cosφ) 2 *R，
the method comprises the steps that delta P is line loss power from a plurality of fans to a wind power plant grid-connected point, P is transmission power from the plurality of fans to the wind power plant grid-connected point, U is output voltage of the plurality of fans, cos phi is a power factor corresponding to the transmission power, and R is resistance from the plurality of fans to the wind power plant grid-connected point.
3. The system of claim 2, wherein the obtain power adjustment data module is further specifically configured to:
calculating power adjustment data corresponding to the initial power adjustment data according to the following formula:
P 2 =P 1 +(P 2 /U*cosφ) 2 *R，
wherein, P 1 For the initial power adjustment data, P 2 And for the power regulation data, U is the output voltage of the fans, cos phi is the power factor corresponding to the initial power regulation data, and R is the resistance from the fans to the wind power plant grid-connected point.
4. The system of claim 1, wherein the obtain power adjustment data module is further specifically configured to:
calculating initial power adjustment data according to:
P 1 =P 0 -P N *(f-f d )/(f N *δ)，
wherein, P 1 For the initial power adjustment data, P 0 For said real-time power, P N Is rated power of the plurality of fans, f is the real-time frequency, f d A boundary frequency f corresponding to the adjustment frequency range N For the frequency rating, δ is the rate of difference.
5. The system of claim 1, wherein the acquisition frequency module is further specifically configured to: the abnormal frequency range is +/-5-20 Hz of the rated frequency of the power grid.
6. The system of claim 5, wherein the recording module is further specifically configured to: the adjusting frequency range is +/-0.03-0.06 Hz of the rated frequency of the power grid.
7. The system of claim 1, wherein the secondary tuning device is configured to transmit secondary tuning data to the primary tuning device.
8. The system of claim 1, wherein the telemechanical device is configured to transmit a telemechanical request to the primary frequency modulation device and receive telemechanical response data transmitted by the primary frequency modulation device.
9. The system of claim 1, wherein the monitoring device is configured to send a monitoring request to the primary frequency modulation device and receive monitoring response data sent by the primary frequency modulation device.
10. The system of claim 1, wherein the plurality of wind turbines are configured to output power corresponding to the wind turbine power adjustment data to the wind farm grid-tie point.
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