CN116094036A

CN116094036A - Output power adjusting method and device, electronic equipment and power station system

Info

Publication number: CN116094036A
Application number: CN202310017994.7A
Authority: CN
Inventors: 李颖
Original assignee: Sungrow Power Supply Co Ltd
Current assignee: Sungrow Power Supply Co Ltd
Priority date: 2023-01-06
Filing date: 2023-01-06
Publication date: 2023-05-09

Abstract

The invention provides an output power adjusting method, an output power adjusting device, electronic equipment and a power station system, wherein the method can be applied to the power station system, a wind power generation subsystem and a photovoltaic power generation subsystem of the power station system are coupled on a low-voltage side of a transformer, and the method comprises the following steps: obtaining the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem and the target power of the transformer; if the total output power is detected to meet the regulation condition, regulating the output power of the wind power generation subsystem and/or the output power of the photovoltaic power generation subsystem so that the total output power does not meet the regulation condition; the adjusting conditions include: the total output power is greater than the target power; alternatively, the total output power is less than the target power and there is an output power limit for at least one of the wind power generation subsystem and the photovoltaic power generation subsystem. By applying the method provided by the invention, the transformer can be shared by the wind power generation subsystem and the photovoltaic power generation subsystem, and the utilization rate of the power transmission line and equipment is improved.

Description

Output power adjusting method and device, electronic equipment and power station system

Technical Field

The present invention relates to the field of power transmission technologies, and in particular, to a method and an apparatus for adjusting output power, an electronic device, and a power station system.

Background

At present, a wind power generation system and a photovoltaic power generation system are respectively connected with different transformers and are coupled at a booster station side; however, the output power of the wind power generation system and the output power of the photovoltaic power generation system have different fluctuation, and continuous full-power generation is difficult, so that the utilization rate of a power transmission line, a transformer and the like of the power generation system is low.

Disclosure of Invention

The invention aims to provide an output power adjusting method, an output power adjusting device, electronic equipment and a power station system, which can improve the utilization rate of a power transmission line and a transformer. The specific scheme is as follows:

an output power regulation method applied to a power plant system comprising a wind power generation subsystem, a photovoltaic power generation subsystem and a transformer, the wind power generation subsystem and the photovoltaic power generation subsystem being coupled on a low voltage side of the transformer, the method comprising:

obtaining the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem and the target power of the transformer;

If the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem is detected to meet the preset regulation condition, regulating at least one of the output power of the wind power generation subsystem and the output power of the photovoltaic power generation subsystem so that the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem does not meet the regulation condition;

the adjustment conditions include: the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem is greater than the target power; or alternatively, the process may be performed,

the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem is less than the target power, and there is an output power limit for at least one of the wind power generation subsystem and the photovoltaic power generation subsystem.

The method, optionally, the process of obtaining the target power of the transformer, includes:

determining current temperature information and scheduling power of the transformer;

determining a first output power of the transformer according to the current temperature information of the transformer and a power temperature derating curve of the transformer;

taking the scheduling power as the target power of the transformer under the condition that the scheduling power is not greater than the first output power;

And taking the first output power as the target power of the transformer under the condition that the scheduling power is larger than the first output power.

In the above method, optionally, if it is detected that the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem is greater than the target power, the adjusting at least one of the output power of the wind power generation subsystem and the output power of the photovoltaic power generation subsystem includes:

and reducing the output power of at least one of the wind power generation subsystem and the photovoltaic power generation subsystem.

The method, optionally, the reducing the output power of at least one of the wind power generation subsystem and the photovoltaic power generation subsystem includes:

determining a target power generation subsystem of output power to be regulated in the wind power generation subsystem and the photovoltaic power generation subsystem;

determining the amount of power to be limited of the target power generation subsystem;

and generating a first control instruction according to the power quantity to be limited, and sending the first control instruction to the target power generation subsystem, wherein the first control instruction is used for indicating the target power generation subsystem to reduce output power based on the power quantity to be limited.

and regulating the voltage to the ground of the neutral point of the transformer according to a preset first regulation mode so as to enable the at least one power generation subsystem to reduce the output power.

In the above method, optionally, if it is detected that the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem is less than the target power and there is an output power limitation for at least one of the wind power generation subsystem and the photovoltaic power generation subsystem, the adjusting at least one of the output power of the wind power generation subsystem and the output power of the photovoltaic power generation subsystem includes:

the output power of the power generation subsystem with the output power limit is boosted.

The method, optionally, the boosting the output power of the power generation subsystem with the output power limitation includes:

determining a current limited power amount of the power generation subsystem with the output power limitation;

determining the power amount to be released from the limit according to the limit power amount, the total output power and the target power;

And generating a second control instruction according to the power quantity to be released, and sending the second control instruction to the power generation subsystem with the output power limitation, wherein the second control instruction is used for indicating the power generation subsystem with the output power limitation to raise the output power based on the power quantity to be released.

and regulating the voltage to the ground of the neutral point of the transformer according to a preset second regulation mode so as to enable the power generation subsystem with output power limitation to boost the output power.

An output power regulating device for use in a power plant system comprising a wind power generation subsystem, a photovoltaic power generation subsystem and a transformer, the wind power generation subsystem and the photovoltaic power generation subsystem being coupled on a low voltage side of the transformer, the device comprising:

an execution unit for obtaining a total output power between the wind power generation subsystem and the photovoltaic power generation subsystem, and a target power of the transformer;

the adjusting unit is used for adjusting at least one of the output power of the wind power generation subsystem and the output power of the photovoltaic power generation subsystem if the fact that the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem meets the preset adjusting condition is detected, so that the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem does not meet the adjusting condition;

An electronic device comprising a memory, and one or more instructions, wherein the one or more instructions are stored in the memory and configured to perform an output power adjustment method as described above by one or more processors.

A power plant system, comprising:

the system comprises control equipment, a power module, a wind power generation subsystem, a photovoltaic power generation subsystem and a transformer;

the wind power generation subsystem and the photovoltaic power generation subsystem are coupled on a low voltage side of the transformer,

the neutral point of the transformer is grounded through the power module;

the control equipment is respectively connected with the power supply module, the wind power generation subsystem, the photovoltaic power generation subsystem and the transformer;

The control device is configured to perform the output power adjustment method as described above.

Compared with the prior art, the embodiment of the invention has the following advantages:

the embodiment of the invention provides an output power adjusting method, an output power adjusting device, electronic equipment and a power station system, wherein the method can be applied to the power station system, the power station system comprises a wind power generation subsystem, a photovoltaic power generation subsystem and a transformer, the wind power generation subsystem and the photovoltaic power generation subsystem are coupled on the low-voltage side of the transformer, and the method comprises the following steps: obtaining the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem and the target power of the transformer; if the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem is detected to meet the preset regulation condition, regulating at least one of the output power of the wind power generation subsystem and the output power of the photovoltaic power generation subsystem so that the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem does not meet the regulation condition; the adjustment conditions include: the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem is greater than the target power; alternatively, the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem is less than the target power, and there is an output power limit for at least one of the wind power generation subsystem and the photovoltaic power generation subsystem. By applying the method provided by the invention, under the condition of avoiding abnormal overload operation of the transformer, the wind power generation subsystem and the photovoltaic power generation subsystem are enabled to generate electricity in a high-efficiency and cooperative manner, the transformer is shared by the wind power generation subsystem and the photovoltaic power generation subsystem, and the utilization rate of the current collecting line, the power transmission line and the equipment is effectively improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

Fig. 1 is a method flowchart of an output power adjustment method according to an embodiment of the present invention;

FIG. 2 is a flowchart of a process for obtaining a target power of a transformer according to an embodiment of the present invention;

FIG. 3 is a flow chart of a process for reducing the output power of a power generation subsystem according to an embodiment of the present invention;

FIG. 4 is a flowchart of a process for boosting the output power of a power generation subsystem according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an output power adjusting device according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a power station system according to an embodiment of the present invention;

FIG. 8 is a diagram illustrating an exemplary implementation scenario provided by an embodiment of the present invention;

FIG. 9 is a flowchart of an output power adjustment process according to an embodiment of the present invention;

fig. 10 is a flowchart of another output power adjustment process according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

At present, a wind power generation system and a photovoltaic power generation system are respectively connected with different transformers and are coupled at a booster station side; however, the wind power generation system and the photovoltaic power generation system have different volatility, and are difficult to maintain full power generation for a long time, so that the wind power generation system and the photovoltaic power generation system are respectively connected with different transformers, and the utilization rate of a current collecting line, a power transmission line and equipment is low.

Based on this, an embodiment of the present invention provides an output power adjusting method, which is applied to a control device in a power station system, where the power station system further includes a wind power generation subsystem, a photovoltaic power generation subsystem, and a transformer, where the transformer may be a medium voltage transformer, and the wind power generation subsystem and the photovoltaic power generation subsystem are coupled at a low voltage side of the transformer, and a flowchart of the output power adjusting method is shown in fig. 1, and specifically includes:

s101: obtaining the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem and the target power of the transformer.

In this embodiment, voltage information and current information output by the wind power generation subsystem and the photovoltaic power generation subsystem may be collected, and total output power of the wind power generation subsystem and the photovoltaic power generation subsystem may be calculated according to the voltage information and the current information.

Optionally, a sum of power capacities of the wind power generation subsystem and the photovoltaic power generation subsystem is greater than a sum of capacities of the transformer; the target power is the power that the transformer is currently required to output.

S102: and if the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem is detected to meet the preset regulation condition, regulating at least one of the output power of the wind power generation subsystem and the output power of the photovoltaic power generation subsystem so that the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem does not meet the regulation condition.

In this embodiment, the adjustment condition includes: the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem is greater than the target power; or alternatively, the process may be performed,

In this embodiment, when the total output power does not meet the adjustment condition, by adjusting the output power of the wind power generation subsystem and/or adjusting the output power of the photovoltaic power generation subsystem, the total output power of the wind power generation subsystem and the photovoltaic power generation subsystem may reach or approach the target power, and in particular, the total output power may be equal to the target power; or the total output power of the wind power generation subsystem and the photovoltaic power generation subsystem is made smaller than the target power and no output power limitation exists. By applying the method provided by the invention, the wind power generation subsystem and the photovoltaic power generation subsystem can efficiently and cooperatively generate power under the condition of avoiding abnormal overload operation of the transformer, the transformer can be shared by the wind power generation subsystem and the photovoltaic power generation subsystem, and the utilization rate of a current collecting line, a power transmission line and equipment is effectively improved.

In an embodiment of the present invention, based on the implementation process described above, specifically, a process for obtaining the target power of the transformer, as shown in fig. 2, includes:

s201: and determining the current temperature information and the dispatching power of the transformer.

In this embodiment, temperature information of the transformer may be collected by the temperature sensor, power scheduling information sent by the upper scheduling system may be obtained, and scheduling power of the transformer may be obtained from the power scheduling information.

S202: and determining the first output power of the transformer according to the current temperature information of the transformer and the power temperature derating curve of the transformer.

In this embodiment, the power temperature derating curve of the transformer includes a correspondence between the temperature of the transformer and the first output power, and the power temperature derating curve may be queried according to the current temperature information to obtain the first output power corresponding to the temperature information, where the first output power is the maximum safe output power of the transformer under the temperature information.

Optionally, after determining the first output power of the transformer, it may be determined whether the scheduled power is greater than the first output power.

S203: and taking the scheduling power as the target power of the transformer under the condition that the scheduling power is not larger than the first output power.

S204: and taking the first output power as the target power of the transformer under the condition that the scheduling power is larger than the first output power.

The mode of obtaining the target power of the transformer in the embodiment can effectively ensure the operation safety of the transformer, and meets the scheduling requirement of the superior scheduling system as much as possible on the premise of ensuring the operation safety of the transformer.

In an embodiment of the present invention, based on the implementation process described above, specifically, if it is detected that the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem is greater than the target power, the adjusting at least one of the output power of the wind power generation subsystem and the output power of the photovoltaic power generation subsystem includes:

In this embodiment, under the condition that the total output power is greater than the target power, the output power of at least one power generation subsystem of the wind power generation subsystem and the photovoltaic power generation subsystem can be reduced, and specifically, the output power of at least one power generation subsystem of the wind power generation subsystem and the photovoltaic power generation subsystem can be limited, so that the total output power of the wind power generation subsystem and the photovoltaic power generation subsystem is equal to the target power, and safe and stable operation of the transformer can be ensured.

In an embodiment of the present invention, based on the implementation process, specifically, the reducing the output power of at least one of the wind power generation subsystem and the photovoltaic power generation subsystem, as shown in fig. 3, includes:

s301: and determining a target power generation subsystem of which the output power is to be regulated in the wind power generation subsystem and the photovoltaic power generation subsystem.

In this embodiment, the target power generation subsystem may be a wind power generation subsystem and/or a photovoltaic power generation subsystem, and optionally, the target power generation subsystem may be a power generation subsystem that is normally connected to the control device through a network.

In some embodiments, if the communication conditions between the control device and the wind power generation subsystem and the photovoltaic power generation subsystem indicate that the communication network is normal, determining a target power generation subsystem for regulating the output power in the wind power generation subsystem and the photovoltaic power generation subsystem.

S302: and determining the power quantity to be limited of the target power generation subsystem.

In the present embodiment, in the case where the number of target power generation subsystems is one, the amount of power to be limited is the difference between the total output power and the target power; under the condition that the number of the target power generation subsystems is a plurality of, the power quantity to be limited of each target power generation subsystem can be determined according to the current output power of each target power generation subsystem and the difference between the total output power and the target power; specifically, the amount of power to be limited of each target power generation subsystem is not greater than the current output power of the target power generation subsystem, and the power to be limited of each power generation subsystem is equal to the difference between the current total output power and the target power.

S303: and generating a first control instruction according to the power quantity to be limited, and sending the first control instruction to the target power generation subsystem, wherein the first control instruction is used for indicating the target power generation subsystem to reduce output power based on the power quantity to be limited.

In this embodiment, the first control instruction may be directly sent to the target power generation subsystem, or may be sent to the target power generation subsystem through the transformer.

In an embodiment of the present invention, based on the implementation process, specifically, the reducing the output power of at least one of the wind power generation subsystem and the photovoltaic power generation subsystem includes:

In this embodiment, the first adjustment manner may be one of increasing voltage or decreasing voltage, and adjusting the voltage to ground of the neutral point of the transformer according to the preset first adjustment manner may be increasing or decreasing the voltage to ground of the neutral point of the transformer, so that the inverter in the photovoltaic power generation subsystem and/or the converter in the wind power generation subsystem reduce the output power in response to detecting the first change of the voltage to ground of the neutral point.

Optionally, the neutral point of the transformer is grounded through the power module, a third control instruction may be sent to the power module, and the third control instruction may instruct the power module to adjust the voltage to ground of the neutral point of the transformer according to the first adjustment mode.

In some embodiments, if the communication conditions between the control device and the wind power generation subsystem and the photovoltaic power generation subsystem represent abnormal communication network, the voltage to ground of the neutral point of the transformer is adjusted according to a preset first adjustment mode.

In an embodiment of the present invention, based on the implementation process described above, specifically, if it is detected that the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem is less than the target power, and there is an output power limitation for at least one of the wind power generation subsystem and the photovoltaic power generation subsystem, the adjusting at least one of the output power of the wind power generation subsystem and the output power of the photovoltaic power generation subsystem includes:

In this embodiment, when the total output power is less than the target power and there is an output power limitation in at least one power generation subsystem, the output power limitation may be released for the power generation subsystem having the output power limitation so that the total output power is equal to the target power, or the total output power is less than the target power and there is no output power limitation in both the wind power generation subsystem and the photovoltaic power generation subsystem.

In an embodiment of the present invention, based on the implementation process described above, specifically, the process of increasing the output power of the power generation subsystem with output power limitation, as shown in fig. 4, includes:

s401: a current limited amount of power of the power generation subsystem for which an output power limit exists is determined.

In the present embodiment, the limited amount of power refers to the amount of power that the power generation subsystem does not output to the transformer.

In some embodiments, if the communication conditions between the control device and the wind power generation subsystem and the photovoltaic power generation subsystem are indicative of a normal communication network, determining that there is a current limited amount of power of the power generation subsystem with an output power limitation.

S402: and determining the power amount to be released from the limit according to the limit power amount, the total output power and the target power.

In the present embodiment, if the number of power generation subsystems in which the output power limitation exists is one, in the case where the limited power amount is less than or equal to the difference between the target power and the total output power, the limited power amount may be determined as the power amount to be released from the limitation; in the case where the limited power amount is larger than the difference between the target power and the total output power, the difference between the target power and the total output power is determined as the power amount to be released from the limitation.

In some embodiments, if the number of the power generation subsystems with output power limitation is a plurality, the limited power amount of each power generation subsystem with output power limitation may be determined as the power amount to be released of the limitation of each power generation subsystem with output power limitation in the case that the sum of the current limited power amounts of the respective power generation subsystems is less than or equal to the difference value of the target power and the total output power; if the sum of the current limiting power amounts of the power generation subsystems is larger than the difference value between the target power and the total output power, at least one power generation subsystem with output power limitation can be selected, and the power amount of the selected power generation subsystem to be released from the limitation is determined; the power quantity to be released from the limit of each selected power generation subsystem is not greater than the limit power quantity of the power generation subsystem, and the power quantity to be released from the limit of each selected power generation subsystem is equal to the difference value between the target power and the total output power.

S403: and generating a second control instruction according to the power quantity to be released, and sending the second control instruction to the power generation subsystem with the output power limitation, wherein the second control instruction is used for indicating the power generation subsystem with the output power limitation to raise the output power based on the power quantity to be released.

In this embodiment, the second control command may be directly sent to the power generation subsystem having the output power limitation, or may be sent to the power generation subsystem having the output power limitation through the transformer.

In this embodiment, by sending the second control instruction to the power generation subsystem having the output power limitation, the power generation subsystem having the output power limitation may be caused to release the limitation of all or part of the output power, so that the total output power does not satisfy the adjustment condition.

In an embodiment of the present invention, based on the implementation process, specifically, the step of increasing the output power of the power generation subsystem with output power limitation includes:

In this embodiment, the second adjustment mode may be a different adjustment mode from the first adjustment mode, for example, in the case where the first adjustment mode is the boost voltage, the second adjustment mode may be the step-down voltage, and in the case where the first adjustment mode is the step-down voltage, the second adjustment mode may be the boost voltage. That is, the first regulation mode is one of a voltage boosting regulation mode and a voltage reducing regulation mode; the second adjustment mode is the other of the two adjustment modes.

In the embodiment, the voltage to ground of the neutral point of the transformer is adjusted in a second adjustment mode, so that an inverter in the photovoltaic power generation subsystem with output power limitation responds to the detected voltage to ground change of the neutral point, and output power is improved; and/or a converter in the wind power generation subsystem having an output power limit boosting the output power in response to detecting a second change in the voltage to ground of the neutral point.

Optionally, the neutral point of the transformer is grounded through the power module, a fourth control instruction may be sent to the power module, and the fourth control instruction may instruct the power module to adjust the voltage to ground of the neutral point of the transformer according to the second adjustment mode.

In some embodiments, if the communication conditions between the control device and the wind power generation subsystem and the photovoltaic power generation subsystem represent abnormal communication network, the voltage to ground of the neutral point of the transformer is adjusted according to a preset second adjustment mode.

Corresponding to the method shown in fig. 1, the embodiment of the present invention further provides an output power adjusting device, which is used for implementing the method shown in fig. 1, where the power station system further includes a wind power generation subsystem, a photovoltaic power generation subsystem, and a transformer, the wind power generation subsystem and the photovoltaic power generation subsystem are coupled at a low voltage side of the transformer, and a schematic structural diagram of the device is shown in fig. 5, and specifically includes:

An execution unit 501 for obtaining a total output power between the wind power generation subsystem and the photovoltaic power generation subsystem, and a target power of the transformer;

an adjusting unit 502, configured to adjust at least one of an output power of the wind power generation subsystem and an output power of the photovoltaic power generation subsystem if it is detected that a total output power between the wind power generation subsystem and the photovoltaic power generation subsystem meets a preset adjustment condition, so that the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem does not meet the adjustment condition;

In an embodiment of the present invention, based on the above solution, optionally, the executing unit 501 includes:

a first determining subunit, configured to determine current temperature information and scheduling power of the transformer;

A second determining subunit, configured to determine a first output power of the transformer according to current temperature information of the transformer and a power temperature derating curve of the transformer;

a first execution subunit, configured to take the scheduled power as a target power of the transformer when the scheduled power is not greater than the first output power;

and the second execution subunit is used for taking the first output power as the target power of the transformer under the condition that the scheduling power is larger than the first output power.

In an embodiment of the present invention, based on the foregoing solution, optionally, if it is detected that the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem is greater than the target power, the adjusting unit 502 includes:

and the first regulating subunit is used for reducing the output power of at least one power generation subsystem of the wind power generation subsystem and the photovoltaic power generation subsystem.

In an embodiment of the present invention, based on the foregoing solution, optionally, the first adjusting subunit includes:

the first determining module is used for determining a target power generation subsystem of which the output power is to be regulated in the wind power generation subsystem and the photovoltaic power generation subsystem;

A second determining module, configured to determine an amount of power to be limited of the target power generation subsystem;

the first sending module is used for generating a first control instruction according to the power quantity to be limited and sending the first control instruction to the target power generation subsystem, and the first control instruction is used for indicating the target power generation subsystem to reduce output power based on the power quantity to be limited.

and the first adjusting module is used for adjusting the voltage to ground of the neutral point of the transformer according to a preset first adjusting mode so as to enable the at least one power generation subsystem to reduce the output power.

In an embodiment of the present invention, based on the foregoing solution, optionally, if it is detected that the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem is less than the target power, and there is an output power limitation of at least one of the wind power generation subsystem and the photovoltaic power generation subsystem, the adjusting unit 502 includes:

and the second regulation subunit is used for boosting the output power of the power generation subsystem with the output power limit.

In an embodiment of the present invention, based on the foregoing solution, optionally, the second adjusting subunit includes:

a third determining module for determining a current limited power amount of the power generation subsystem having an output power limit;

a fourth determining module, configured to determine an amount of power to be released from the limitation according to the amount of limited power, the total output power, and the target power;

the second sending module is used for generating a second control instruction according to the power quantity to be released, and sending the second control instruction to the power generation subsystem with the output power limit, wherein the second control instruction is used for indicating the power generation subsystem with the output power limit to promote the output power based on the power quantity to be released.

and the second regulation module is used for regulating the voltage to the ground of the neutral point of the transformer according to a preset second regulation mode so as to enable the power generation subsystem with output power limitation to boost the output power.

The specific principle and execution process of each unit and module in the output power adjusting device disclosed in the above embodiment of the present invention are the same as those of the output power adjusting method disclosed in the above embodiment of the present invention, and reference may be made to corresponding parts in the output power adjusting method provided in the above embodiment of the present invention, and no redundant description is given here.

The embodiment of the invention also provides a storage medium, which comprises stored instructions, wherein the equipment where the storage medium is located is controlled to execute the output power adjusting method when the instructions run.

The embodiment of the present invention further provides an electronic device, whose structural schematic diagram is shown in fig. 6, specifically including a memory 601, and one or more instructions 602, where the one or more instructions 602 are stored in the memory 601, and configured to be executed by the one or more processors 603, where the one or more instructions 602 perform the following operations:

The embodiment of the invention also provides a power station system, the structural schematic diagram of which is shown in fig. 7, comprising:

control device 701, power module 702, wind power subsystem 703, photovoltaic power subsystem 704, and transformer 705;

the wind power subsystem 703 and the photovoltaic power subsystem 704 are coupled on the low voltage side of the transformer 705,

the neutral point of the transformer 705 is grounded through the power module 702;

the control device 701 is respectively connected with the power module 702, the wind power generation subsystem 703, the photovoltaic power generation subsystem 704 and the transformer 705;

In this embodiment, the transformer may be a medium voltage transformer, and a current measurement and control device, a voltage measurement and control device, a temperature sensor, and the like may be disposed in the transformer.

Optionally, the control device may be a subarray cooperative control module, and the wind power generation subsystem may include at least one fan converter and a fan; the photovoltaic power generation subsystem may include at least one inverter and a photovoltaic in-subarray device.

In order to fully utilize the medium voltage transformer, the power transmission equipment, the land resource and the current collecting line, a certain proportion of photovoltaic power generation is additionally arranged in the wind power plant, and the sum of the photovoltaic alternating current power capacity and the wind power alternating current power capacity is larger than the power capacity of the medium voltage transformer, so that a time period exists when the sum of the photovoltaic power and the wind power is larger than the power of the medium voltage transformer, and the transformer is enabled to operate abnormally and overloaded.

Based on this, referring to fig. 8, an exemplary diagram of an implementation scenario provided for an embodiment of the present invention is shown, which includes a wind power generation subsystem, a photovoltaic power generation subsystem, a medium voltage transformer, a sub-array cooperative control module, and a power supply module; the wind power generation subsystem and the photovoltaic power generation subsystem are coupled at the low-voltage side of the medium-voltage transformer; the high-voltage side of the medium-voltage transformer is connected into a power grid through a booster station. The subarray cooperative control module is used for communicating the wind power generation subsystem, the photovoltaic power generation subsystem and the data acquisition device for box transformer measurement and control in the transformer, and receiving an upper-level scheduling instruction through communication.

In the embodiment, the subarray cooperative control module monitors the on-line condition and rated power of the wind power generation subsystem and the photovoltaic power generation subsystem in real time, and simultaneously, the output power of the wind power generation subsystem and the photovoltaic power generation subsystem is cooperatively controlled according to the target power of the medium-voltage transformer. Optionally, the target power of the subarray cooperative control module is calculated according to a power temperature derating curve of the medium voltage transformer and an upper power scheduling instruction.

Optionally, the subarray cooperative control module detects abnormal communication between the wind power generation subsystem and the photovoltaic power generation subsystem under the subarray in real time.

In this embodiment, the subarray cooperative control module calculates the low-voltage side power of the medium-voltage transformer, that is, the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem, through the voltage and the current collected by the measurement and control device of the medium-voltage transformer, and compares the low-voltage side power with the target power of the medium-voltage transformer to cooperatively control the wind power and the photovoltaic output power.

In this embodiment, the subarray cooperative control module may send a voltage command to the power module, and the power module performs closed-loop control on the voltage between the neutral point N of the transformer and the ground according to the command. The power module is connected in series between the neutral point N of the transformer and the ground.

Specifically, in the case that the communication network between the subarray cooperative control module and the wind power generation subsystem or the photovoltaic power generation subsystem is normal, an output power adjusting process of the subarray cooperative control module is shown in fig. 9, which specifically includes the following steps:

and A1, calculating target power A by the subarray cooperative control module according to the power scheduling of the upper stage and the power temperature derating curve of the medium-voltage transformer.

Step A2: and a measurement and control module of the medium voltage transformer acquires voltage and current information of the low voltage side of the medium voltage transformer, and the total output power B is obtained by calculation of a subarray cooperative control module.

Step A3: judging whether A < B; or A > B, and fan or photovoltaic limited power conditions; if yes, executing the step A4; if not, the process is ended.

Step A4: the subarray cooperative control module transmits a power target value to a fan of the wind power generation subsystem and an inverter of the photovoltaic power generation subsystem through a communication network, so that the fan and the inverter perform power output according to the power target value of communication data, and the step A3 is executed in a returning mode, wherein the subarray cooperative control module needs to reduce power of the wind power generation subsystem and/or the photovoltaic power generation subsystem under the condition of A < B, and the subarray cooperative control module needs to increase power of the wind power generation subsystem and/or the photovoltaic power generation subsystem under the condition of A > B.

Specifically, in the case that the communication network between the subarray cooperative control module and the wind power generation subsystem or the photovoltaic power generation subsystem is abnormal, another output power adjusting process of the subarray cooperative control module is shown in fig. 10, which specifically includes the following steps:

step B1: and the subarray cooperative control module calculates target power A according to the power scheduling of the upper stage and the power temperature derating curve of the medium-voltage transformer.

Step B2: and a measurement and control module of the medium voltage transformer acquires voltage and current information of the low voltage side of the medium voltage transformer, and the voltage and current information is calculated by a subarray cooperative control module to obtain power B.

Step B3: judging whether A < B; or A > B, and fan or photovoltaic limited power conditions; if yes, executing the step B4; if not, the process is ended.

Step B4: the subarray control module sends an instruction to the power supply module, and the power supply module controls the output voltage according to the instruction, so that converters in the photovoltaic power generation subsystem and the wind power generation subsystem sample the neutral point N to ground voltage in real time, and a power output control value is carried out according to the voltage.

In this embodiment, because of the output complementarity of the wind power generation subsystem and the photovoltaic power generation subsystem, the wind power generation subsystem and the photovoltaic power generation subsystem can share the medium voltage transformer, thereby improving the utilization rate of the medium voltage transformer, the power transmission equipment, the land resource and the collector line.

In the implementation, the voltage and current information of the low-voltage side of the sub-array medium-voltage transformer is sampled through the measurement and control device of the medium-voltage transformer, the sub-array cooperative control module obtains sampled voltage and current signals, the real-time power of the low-voltage side of the medium-voltage transformer is calculated, the real-time power of each sub-array is obtained for closed-loop adjustment, and the response time and the response precision of the sub-array cooperative controller to the scheduling instruction of the wind-solar converter are improved. The output voltage of the power supply module is controlled to change the voltage of the neutral point N of the transformer to the ground, so that the inverter and the fan converter control the output power by collecting the internal voltage N to the ground, and finally, the redundant control of the power control is achieved, and the reliability of the system is improved.

It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other. For the apparatus class embodiments, the description is relatively simple as it is substantially similar to the method embodiments, and reference is made to the description of the method embodiments for relevant points.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

For convenience of description, the above devices are described as being functionally divided into various units, respectively. Of course, the functions of each element may be implemented in the same piece or pieces of software and/or hardware when implementing the present invention.

From the above description of embodiments, it will be apparent to those skilled in the art that the present invention may be implemented in software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the embodiments or some parts of the embodiments of the present invention.

The foregoing has outlined a detailed description of a method for regulating output power, wherein specific examples are provided herein to illustrate the principles and embodiments of the present invention, and the above examples are provided to assist in understanding the method and core concepts of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.

Claims

1. A method of regulating output power, characterized by being applied to a power plant system comprising a wind power generation subsystem, a photovoltaic power generation subsystem and a transformer, the wind power generation subsystem and the photovoltaic power generation subsystem being coupled on a low voltage side of the transformer, the method comprising:

2. The method of claim 1, wherein obtaining the target power of the transformer comprises:

3. The method of claim 1, wherein the adjusting at least one of the output power of the wind power generation subsystem and the output power of the photovoltaic power generation subsystem if the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem is detected to be greater than the target power comprises:

4. A method according to claim 3, wherein said reducing the output power of at least one of the wind power generation subsystem and the photovoltaic power generation subsystem comprises:

5. A method according to claim 3, wherein said reducing the output power of at least one of the wind power generation subsystem and the photovoltaic power generation subsystem comprises:

6. The method of claim 1, wherein the adjusting at least one of the output power of the wind power generation subsystem and the output power of the photovoltaic power generation subsystem if it is detected that the total output power between the wind power generation subsystem and the photovoltaic power generation subsystem is less than the target power and there is an output power limit for at least one of the wind power generation subsystem and the photovoltaic power generation subsystem comprises:

7. The method of claim 6, wherein boosting the output power of the power generation subsystem with an output power limit comprises:

8. The method of claim 6, wherein boosting the output power of the power generation subsystem with an output power limit comprises:

9. An output power regulating device for use in a power plant system comprising a wind power generation subsystem, a photovoltaic power generation subsystem and a transformer, the wind power generation subsystem and the photovoltaic power generation subsystem being coupled on a low voltage side of the transformer, the device comprising:

10. An electronic device comprising a memory and one or more instructions, wherein the one or more instructions are stored in the memory and configured to perform the output power adjustment method of any of claims 1-8 by one or more processors.

11. A power plant system, comprising:

the neutral point of the transformer is grounded through the power module;

The control apparatus is configured to execute the output power adjustment method according to any one of claims 1 to 8.