CN113452088A - Photovoltaic field control method, device and system under power limiting condition - Google Patents

Photovoltaic field control method, device and system under power limiting condition Download PDF

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Publication number
CN113452088A
CN113452088A CN202110741581.4A CN202110741581A CN113452088A CN 113452088 A CN113452088 A CN 113452088A CN 202110741581 A CN202110741581 A CN 202110741581A CN 113452088 A CN113452088 A CN 113452088A
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active
instruction
deviation
inverter
calculating
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朱建华
何卓林
马建胜
厉志波
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China Resource Power Technology Research Institute
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Rundian Energy Science and Technology Co Ltd
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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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • 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
    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a photovoltaic field control method under a power-limiting condition, which can calculate the deviation of a currently acquired scheduling instruction and the active instruction of each inverter at the same time by calculating the active instruction deviation, and then distribute the active instruction deviation according to the ratio of the active real-time value actually output by each inverter to the scheduling instruction to obtain the distribution coefficient of each inverter, so that the electric energy output by the inverters can be adjusted in real time according to the current actual output value of each inverter and the scheduling instruction, and the scheduling instruction can be accurately distributed to each inverter. The invention also provides a photovoltaic field control device under the electricity limiting condition and a photovoltaic field control system under the electricity limiting condition, and the photovoltaic field control device and the photovoltaic field control system have the beneficial effects.

Description

Photovoltaic field control method, device and system under power limiting condition
Technical Field
The invention relates to the technical field of photovoltaic power station control, in particular to a photovoltaic field control method under a power limiting condition, a photovoltaic field control device under the power limiting condition and a photovoltaic field control system under the power limiting condition.
Background
At present, the automatic power generation control plays a role in maintaining the receiving and distribution of dispatching instructions for a photovoltaic power plant, and how to efficiently distribute the dispatching instructions to a plurality of photovoltaic inverter groups is a practical problem in the research of the photovoltaic power plant at present.
The existing automatic power generation control system can accurately transmit a scheduling instruction to an inverter group of a photovoltaic power station, but because the photovoltaic power station is provided with a plurality of brands of inverters, the adjustment time and the control response time of different inverters have certain difference, so that the situation of inconsistent response occurs when active instructions are directly distributed; in addition, the adjustment accuracy of different inversions is also greatly different, so that the output of the actual photovoltaic panel has certain difference. Particularly, when a photovoltaic power station faces a scheduling power limiting condition, the photovoltaic inverter cannot operate in a maximum power tracking mode, so that active power is more difficult to reasonably distribute. Therefore, how to provide a photovoltaic field control method capable of accurately distributing scheduling instructions to each inverter is a problem which needs to be solved urgently by a person skilled in the art.
Disclosure of Invention
The invention aims to provide a photovoltaic field control method under the condition of power limitation, which can accurately distribute scheduling instructions to each inverter; the invention also provides a photovoltaic field control device under the electricity limiting condition and a photovoltaic field control system under the electricity limiting condition, and the photovoltaic field control device and the photovoltaic field control system can accurately distribute dispatching instructions to all inverters.
In order to solve the technical problem, the invention provides a photovoltaic field control method under a power-limiting condition, which comprises the following steps:
acquiring a scheduling instruction and active instructions corresponding to a plurality of inverters respectively;
calculating an active instruction deviation according to the dispatching instruction and the active instructions;
calculating a distribution coefficient corresponding to each inverter according to an active real-time value, the active instruction and the scheduling instruction of each inverter; the distribution coefficient is used for representing the ratio of an active real-time value of each inverter to the scheduling instruction;
calculating the total station deviation distribution of each inverter according to the distribution coefficient and the active command deviation;
and sending the station deviation distribution to corresponding inverters so that the inverters output electric energy according to the station deviation distribution.
Optionally, the calculating an active instruction deviation according to the scheduling instruction and the active instructions includes:
and subtracting each active instruction from the scheduling instruction to obtain the active instruction deviation.
Optionally, the step of distributing the output electric energy by the inverter according to the station deviation includes:
the inverter acquires the corresponding total station deviation distribution, the active real-time value and the previous active instruction;
calculating an active control deviation according to the total station deviation distribution, the active real-time value and the previous active instruction;
calculating a proportional parameter instruction according to the active control deviation and a proportional conversion coefficient;
calculating an integral parameter instruction according to the active control deviation and an integral conversion coefficient;
calculating a differential parameter instruction according to the active control deviation and the differential conversion coefficient;
calculating a current active instruction according to the proportional parameter instruction, the integral parameter instruction, the differential parameter instruction and the active control deviation;
and outputting corresponding electric energy according to the current active instruction.
Optionally, the calculating an active control deviation according to the total station deviation allocation, the active real-time value and the previous active instruction includes:
and adding the real-time active value to the previous active instruction, and subtracting the total station deviation distribution to obtain the active control deviation.
Optionally, the calculating a proportional parameter command according to the active control deviation and the proportional conversion coefficient includes:
multiplying the absolute value of the active control deviation by a proportional conversion coefficient to obtain a proportional parameter instruction;
the instruction for calculating the integral parameter according to the active control deviation and the integral conversion coefficient comprises the following steps:
multiplying the absolute value of the active control deviation by the reciprocal of an integral conversion coefficient to obtain an integral parameter instruction;
the calculating of the differential parameter command according to the active control deviation and the differential conversion coefficient includes:
and multiplying the absolute value of the active control deviation by a differential conversion coefficient to obtain a differential parameter instruction.
Optionally, the calculating a current active command according to the proportional parameter command, the integral parameter command, the derivative parameter command, and the active control deviation includes:
and multiplying the proportional parameter instruction, the integral parameter instruction and the differential parameter instruction by the active control deviation respectively and then adding to obtain the current active instruction.
The invention also provides a photovoltaic field control device under the condition of electricity limitation, which comprises:
the substation acquisition module is used for acquiring a scheduling instruction and active instructions corresponding to the plurality of inverters;
the active instruction deviation module is used for calculating active instruction deviation according to the scheduling instruction and the active instructions;
the distribution coefficient module is used for calculating a distribution coefficient corresponding to each inverter according to an active real-time value of each inverter, the active instruction and the scheduling instruction;
the total station deviation distribution module is used for calculating total station deviation distribution of each inverter according to the distribution coefficient and the active instruction deviation;
and the electric energy output module is used for transmitting the station deviation distribution to the corresponding inverter so that the inverter outputs electric energy according to the station deviation distribution.
Optionally, the method further includes:
the inverter acquisition module is used for acquiring the corresponding total station deviation distribution, the active real-time value and the previous active instruction by an inverter;
an active control deviation module, configured to calculate an active control deviation according to the total station deviation allocation, the active real-time value, and the previous active instruction;
the proportional parameter instruction module is used for calculating a proportional parameter instruction according to the active control deviation and the proportional conversion coefficient;
the integral parameter instruction module is used for calculating an integral parameter instruction according to the active control deviation and an integral conversion coefficient;
the differential parameter instruction module is used for calculating a differential parameter instruction according to the active control deviation and the differential conversion coefficient;
the active instruction module is used for calculating a current active instruction according to the proportional parameter instruction, the integral parameter instruction, the differential parameter instruction and the active control deviation;
and the inverter electric energy output module is used for outputting corresponding electric energy according to the current active instruction.
The invention also provides a photovoltaic field control system under the condition of electricity limitation, which comprises a control substation and a plurality of inverters, wherein each inverter is connected with a photovoltaic cell;
the control substation is used for:
acquiring a scheduling instruction and active instructions corresponding to a plurality of inverters respectively;
calculating an active instruction deviation according to the dispatching instruction and the active instructions;
calculating a distribution coefficient corresponding to each inverter according to an active real-time value, the active instruction and the scheduling instruction of each inverter;
calculating the total station deviation distribution of each inverter according to the distribution coefficient and the active command deviation;
and sending the station deviation distribution to corresponding inverters so that the inverters output electric energy according to the station deviation distribution.
Optionally, the inverter is specifically configured to:
acquiring the corresponding total station deviation distribution, the active real-time value and the previous active instruction;
calculating an active control deviation according to the total station deviation distribution, the active real-time value and the previous active instruction;
calculating a proportional parameter instruction according to the active control deviation and a proportional conversion coefficient;
calculating an integral parameter instruction according to the active control deviation and an integral conversion coefficient;
calculating a differential parameter instruction according to the active control deviation and the differential conversion coefficient;
calculating a current active instruction according to the proportional parameter instruction, the integral parameter instruction, the differential parameter instruction and the active control deviation;
and outputting corresponding electric energy according to the current active instruction.
The invention provides a photovoltaic field control method under a power limiting condition, which comprises the steps of obtaining a scheduling instruction and active instructions corresponding to a plurality of inverters respectively; calculating the active instruction deviation according to the scheduling instruction and the active instructions; calculating the distribution coefficient corresponding to each inverter according to the active real-time value, the active instruction and the scheduling instruction of each inverter; the distribution coefficient represents the ratio of the active real-time value of each inverter to the scheduling instruction; calculating the total station deviation distribution of each inverter according to the distribution coefficient and the active command deviation; and sending the station deviation distribution to the corresponding inverter so that the inverter outputs electric energy according to the station deviation distribution.
The deviation of the currently acquired scheduling instruction and the active instruction of each inverter can be calculated by calculating the active instruction deviation, and then the active instruction deviation can be distributed according to the ratio of the active real-time value actually output by each inverter to the scheduling instruction to obtain the distribution coefficient of each inverter, so that the electric energy output by each inverter can be adjusted in real time according to the current actual output value of each inverter and the scheduling instruction, and the scheduling instruction can be accurately distributed to each inverter.
The invention also provides a photovoltaic field control device under the electricity limiting condition and a photovoltaic field control system under the electricity limiting condition, and the photovoltaic field control device and the photovoltaic field control system have the beneficial effects and are not repeated herein.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a flowchart of a photovoltaic field control method under a power-limited condition according to an embodiment of the present invention;
FIG. 2 is a flow diagram of an empty box of the control substation;
fig. 3 is a flowchart of a photovoltaic field control method under a specific power-limiting condition according to an embodiment of the present invention;
FIG. 4 is a flow chart of an empty box of the inverter;
fig. 5 is a block diagram of a photovoltaic field control apparatus under a power-limited condition according to an embodiment of the present invention;
fig. 6 is a block diagram of a photovoltaic field control system under a power-limited condition according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a photovoltaic field control method under the condition of electricity limitation. In the prior art, because a photovoltaic power station is provided with a plurality of brands of inverters, the adjusting time and the control response time of different inverters have certain difference, so that the situation of inconsistent response occurs when active power instructions are directly distributed; in addition, the adjustment accuracy of different inversions is also greatly different, so that the output of the actual photovoltaic panel has certain difference. Particularly, when a photovoltaic power station faces a scheduling power limiting condition, the photovoltaic inverter cannot operate in a maximum power tracking mode, so that active power is more difficult to reasonably distribute.
The photovoltaic field control method under the power limiting condition comprises the steps of obtaining a scheduling instruction and active instructions corresponding to a plurality of inverters respectively; calculating the active instruction deviation according to the scheduling instruction and the active instructions; calculating the distribution coefficient corresponding to each inverter according to the active real-time value, the active instruction and the scheduling instruction of each inverter; the distribution coefficient represents the ratio of the active real-time value of each inverter to the scheduling instruction; calculating the total station deviation distribution of each inverter according to the distribution coefficient and the active command deviation; and sending the station deviation distribution to the corresponding inverter so that the inverter outputs electric energy according to the station deviation distribution.
The deviation of the currently acquired scheduling instruction and the active instruction of each inverter can be calculated by calculating the active instruction deviation, and then the active instruction deviation can be distributed according to the ratio of the active real-time value actually output by each inverter to the scheduling instruction to obtain the distribution coefficient of each inverter, so that the electric energy output by each inverter can be adjusted in real time according to the current actual output value of each inverter and the scheduling instruction, and the scheduling instruction can be accurately distributed to each inverter.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and fig. 2, fig. 1 is a flowchart of a photovoltaic field control method under a power-limited condition according to an embodiment of the present invention; fig. 2 is a flow chart of an empty box of the control substation.
It should be noted that, in the embodiment of the present invention, the photovoltaic farm control method is mainly applied to the control substation. In practical situations, individual photovoltaic cells need to be connected to inverters, and the entire photovoltaic plant typically needs to be provided with a plurality of inverters. The control sub-station is connected with a plurality of inverters and is used for realizing automatic control of the plurality of inverters.
Referring to fig. 1 and fig. 2, in an embodiment of the present invention, a method for controlling a photovoltaic field under a power-limited condition includes:
s101: and acquiring a scheduling command and active commands corresponding to the plurality of inverters respectively.
The scheduling instruction is specifically an instruction sent by a scheduling staff of a power grid company, and is mainly used for maintaining the overall stability of the power grid. Because the grid-connected photovoltaic system must unconditionally receive control of scheduling, scheduling can be adjusted to the power station in real time according to the stability of the power grid and weather conditions. In this step, the control substation first obtains the scheduling command and the active commands corresponding to the inverters connected to the control substation.
The active command is generally a command generated when a control module of the inverter controls the output electric energy of the inverter, and the active command is generated by the inverter and acts on the inverter to adjust the output electric energy of the inverter. For specific physical meanings of the active instruction, reference may be made to the prior art, and details thereof are not described herein.
S102: and calculating the active instruction deviation according to the scheduling instruction and the active instructions.
In this step, an active command deviation corresponding to the plurality of inverters connected to the control slave station is calculated from the scheduling command and the active command acquired in S103, that is, in this step, a deviation corresponding to the scheduling command of the entire control slave station needs to be calculated. Specifically, the active command deviation is equal to the sum of the scheduling command minus each active command, that is, the active command deviation is Pord-sum(Pi) I ═ 1,2, …, n; wherein P isordFor scheduling instructions, PiAnd sum is a summation sign for an active instruction of the ith inverter. Namely, the step is usually embodied as follows: and subtracting each active instruction from the scheduling instruction to obtain the active instruction deviation so as to realize real-time tracking of the scheduling instruction.
S103: and calculating the distribution coefficient corresponding to each inverter according to the active real-time value, the active instruction and the scheduling instruction of each inverter.
In the embodiment of the present invention, the distribution coefficient is used for characterizing the ratio of the active real-time value of each inverter to the scheduling command. Specifically, the specific calculation formula of the distribution coefficient in the embodiment of the present invention is as follows:
Figure BDA0003141567350000081
wherein L isiDistribution coefficient, P, for the i-th invertermiThe real-time active value of the ith inverter. Sign in the formula is a sign function, and when the value in the bracket is greater than 0, sign outputs 1; when the value in the parentheses is less than 0, sign outputs 0.
S104: and calculating the total station deviation distribution of each inverter according to the distribution coefficient and the active command deviation.
In this step, the total station deviation distribution to be transmitted to each inverter is calculated based on the distribution coefficient calculated in S103 and in combination with the active command deviation calculated in S102. Specifically, the active power command deviation is distributed according to the ratio of the active power Pmi sent by each inverter to the scheduling command Pord, that is, the active power command deviation and the L corresponding to the ith inverter are distributediMultiplying to obtain the total station deviation distribution P corresponding to the ith inverterierr. And repeating the process, namely distributing corresponding total station deviation distribution to the plurality of inverters.
S105: and sending the station deviation distribution to the corresponding inverter so that the inverter outputs electric energy according to the station deviation distribution.
In this step, the control slave station will send the total station deviation distribution calculated in S104 to the corresponding inverter, so that the inverter can distribute P according to the obtained total station deviation distributionierrAnd outputting corresponding electric energy. The specific process of the inverter for distributing the output power according to the station deviation will be described in detail in the following embodiments of the invention, which are described hereinNo further description is given.
The photovoltaic field control method under the power limiting condition comprises the steps of obtaining a scheduling instruction and active instructions corresponding to a plurality of inverters respectively; calculating the active instruction deviation according to the scheduling instruction and the active instructions; calculating the distribution coefficient corresponding to each inverter according to the active real-time value, the active instruction and the scheduling instruction of each inverter; the distribution coefficient represents the ratio of the active real-time value of each inverter to the scheduling instruction; calculating the total station deviation distribution of each inverter according to the distribution coefficient and the active command deviation; and sending the station deviation distribution to the corresponding inverter so that the inverter outputs electric energy according to the station deviation distribution.
The deviation of the currently acquired scheduling instruction and the active instruction of each inverter can be calculated by calculating the active instruction deviation, and then the active instruction deviation can be distributed according to the ratio of the active real-time value actually output by each inverter to the scheduling instruction to obtain the distribution coefficient of each inverter, so that the electric energy output by each inverter can be adjusted in real time according to the current actual output value of each inverter and the scheduling instruction, and the scheduling instruction can be accurately distributed to each inverter.
The following embodiments of the present invention will be described in detail with reference to the specific contents of a photovoltaic field control method under a limited power condition.
Referring to fig. 3 and fig. 4, fig. 3 is a flowchart of a specific photovoltaic field control method under a power-limited condition according to an embodiment of the present invention; fig. 4 is a flow chart of an empty box of the inverter.
It should be noted that the control method provided by the embodiment of the present invention is mainly applied to the inverter, and specifically, a specific flow of the adaptive output electric energy after the inverter receives the station deviation distribution. Specifically, the embodiment of the present invention introduces a specific step of distributing the output power by the inverter according to the station deviation in the above S105. The detailed working flow of the control substation has been described in detail in the above embodiments of the present invention, and will not be described herein again.
Referring to fig. 3 and 4, in an embodiment of the present invention, a method for controlling a photovoltaic field under a power-limited condition includes:
s201: and the inverter acquires the corresponding total station deviation distribution, the active real-time value and the previous active instruction.
In this step, the control module of the inverter receives the distribution P of the station deviationierrIts own real time value, i.e. the inverter's own active output PmiAnd the active command P generated before the inverteriI.e. the active instruction generated before the present scheduling instruction takes effect.
S202: and calculating the active control deviation according to the total station deviation distribution, the active real-time value and the previous active command.
In this step, the inverters need to calculate deviations corresponding to the scheduling commands of the inverters. Specifically, the steps are generally specifically as follows: and adding the real-time active value to the previous active instruction, and subtracting the total station deviation distribution to obtain the active control deviation. I.e. the active control deviation Pmi+Pi-Pierr。
S203: and calculating a proportional parameter instruction according to the active control deviation and the proportional conversion coefficient.
In the embodiment of the present invention, a proportional conversion coefficient Ki is preset, and then in this step, the inverter may specifically multiply the absolute value of the active control deviation by the proportional conversion coefficient to obtain a proportional parameter command. The absolute value of the active control deviation can be calculated by an abs (absolute) module in the step, after the abs module is used, the absolute value of the active control deviation is multiplied by the proportional conversion coefficient to obtain a proportional parameter instruction, and then the proportional parameter instruction is usually input into a proportional amplitude limiting module, namely the proportional amplitude limiting module is used to control the proportional parameter instruction within a reasonable range.
S204: and calculating an integral parameter instruction according to the active control deviation and the integral conversion coefficient.
In the embodiment of the present invention, an integral conversion coefficient Ti is preset, and then in this step, the inverter may specifically multiply the absolute value of the active control deviation by the reciprocal of the integral conversion coefficient to obtain the integral parameter command. The absolute value of the active control deviation can be calculated in this step through abs module. After the abs module is used, the absolute value of the active control deviation is multiplied by the inverse of the integral conversion coefficient, i.e. 1/Ti, so as to convert the active control deviation into an integral parameter command. And then, the result of multiplying the active control deviation by 1/Ti is input into an integral function 1/s, wherein s represents a Laplacian operator in an automatic control theory, and 1/s represents the integral function, and under the normal condition, an integral parameter instruction is input into an integral amplitude limiting module, namely the integral parameter instruction is controlled within a reasonable range by using the integral amplitude limiting module.
S205: and calculating a differential parameter command according to the active control deviation and the differential conversion coefficient.
In the embodiment of the present invention, a differential conversion coefficient Di is preset, and then in this step, the inverter may specifically multiply the absolute value of the active control deviation by the differential conversion coefficient to obtain a differential parameter command. The absolute value of the active control deviation can be calculated in this step through abs module. After the abs module is used, the absolute value of the active control deviation is multiplied by the differential conversion coefficient Di to obtain a differential parameter command. The proportional parameter command is then usually input to the integral amplitude limiting module, i.e. the integral amplitude limiting module is used to control the differential parameter command within a reasonable range.
S206: and calculating the current active instruction according to the proportional parameter instruction, the integral parameter instruction, the differential parameter instruction and the active control deviation.
The current active command, that is, the active command generated by the inverter according to the latest scheduling command, at this time, the inverter does not output the output electric energy according to the current active command. Specifically, in this step, the proportional parameter command, the integral parameter command, and the differential parameter command may be respectively multiplied by the active control deviation and added to obtain the current active command.
That is, in this step, the inverter usually uses a multiplier to multiply the proportional parameter command by the active control deviation to obtain a proportional output; meanwhile, a multiplier is used for multiplying the differential parameter command by the active control deviation, and then the result is input into a differential tracker to obtain differential output. Wherein the differential tracker (Tracking-differential) can output two signals z1(t) and z2(t) according to an input signal v (t), wherein z1(t) tracks the signal v (t), and z2(t) is the derivative of z1(t), and z2(t) can be regarded as the approximate derivative of v (t). The differential parameter command is multiplied by the active control deviation by a multiplier, and a differential output corresponding to the differential parameter command can be obtained by using a differential tracker.
Meanwhile, in the step, an integral parameter instruction output by an integral function 1/s and active control deviation are input into a divider to obtain integral output. And finally, after summing operation is carried out on the proportional output, the integral output and the differential output in the step, the active amplitude limiting is input to limit the output range, and finally the active instruction of the inverter is obtained through calculation.
S207: and outputting corresponding electric energy according to the current active instruction.
Finally, in this step, the inverter outputs the corresponding electric energy according to the active command calculated in S206 to complete the scheduling command.
The photovoltaic field control method under the power limiting condition can adaptively realize real-time adjustment of active instructions of the inverters, so that active power distribution of the inverters is more uniform, and utilization efficiency of each inverter is improved.
The following describes a photovoltaic field control device under a limited power condition according to an embodiment of the present invention, and the photovoltaic field control device described below and the photovoltaic field control method described above may be referred to correspondingly.
Referring to fig. 5, fig. 5 is a block diagram of a photovoltaic field control apparatus under a power-limited condition according to an embodiment of the present invention.
Referring to fig. 5, in an embodiment of the present invention, a photovoltaic field control apparatus may include:
and the substation acquisition module 100 is configured to acquire the scheduling instruction and active instructions corresponding to the plurality of inverters.
And an active command deviation module 200, configured to calculate an active command deviation according to the scheduling command and the active commands.
The distribution coefficient module 300 is configured to calculate a distribution coefficient corresponding to each inverter according to the active real-time value, the active command, and the scheduling command of each inverter.
And a total station deviation distribution module 400, configured to calculate a total station deviation distribution of each inverter according to the distribution coefficient and the active command deviation.
And the electric energy output module 500 is configured to send the total station deviation distribution to a corresponding inverter, so that the inverter outputs electric energy according to the total station deviation distribution.
It should be noted that the substation acquisition module 100, the active instruction deviation module 200, the distribution coefficient module 300, the total station deviation distribution module 400, and the power output module 500 are generally disposed in the control substation, and specific contents of the control substation are described in detail in the foregoing embodiments of the present invention, and are not described again here.
Preferably, in the embodiment of the present invention, the active command deviation module 200 is specifically configured to:
and subtracting each active instruction from the scheduling instruction to obtain the active instruction deviation.
Preferably, in the embodiment of the present invention, the method further includes:
and the inverter acquisition module is used for acquiring the corresponding total station deviation distribution, the active real-time value and the previous active instruction by the inverter.
And the active control deviation module is used for calculating the active control deviation according to the total station deviation distribution, the active real-time value and the previous active instruction.
And the proportional parameter instruction module is used for calculating a proportional parameter instruction according to the active control deviation and the proportional conversion coefficient.
And the integral parameter instruction module is used for calculating an integral parameter instruction according to the active control deviation and the integral conversion coefficient.
And the differential parameter instruction module is used for calculating a differential parameter instruction according to the active control deviation and the differential conversion coefficient.
And the active instruction module is used for calculating the current active instruction according to the proportional parameter instruction, the integral parameter instruction, the differential parameter instruction and the active control deviation.
And the inverter electric energy output module is used for outputting corresponding electric energy according to the current active instruction.
It should be noted that, the inverter obtaining module, the active control deviation module, the proportional parameter instruction module, the integral parameter instruction module, the differential parameter instruction module, the active instruction module, and the inverter electric energy output module are generally disposed in the inverter, and are specifically disposed in the control module of the inverter, and specific contents related to the inverter have been described in detail in the above embodiments of the present invention, and are not described again here.
Preferably, in the embodiment of the present invention, the active control deviation module is specifically configured to:
and adding the real-time active value to the previous active instruction, and subtracting the total station deviation distribution to obtain the active control deviation.
Preferably, in the embodiment of the present invention, the proportional parameter instruction module is specifically configured to:
and multiplying the absolute value of the active control deviation by a proportional conversion coefficient to obtain a proportional parameter instruction.
The integral parameter instruction module is specifically configured to:
and multiplying the absolute value of the active control deviation by the reciprocal of an integral conversion coefficient to obtain an integral parameter instruction.
The differential parameter command module is specifically configured to:
and multiplying the absolute value of the active control deviation by a differential conversion coefficient to obtain a differential parameter instruction.
Preferably, in the embodiment of the present invention, the active instruction module is specifically configured to:
and multiplying the proportional parameter instruction, the integral parameter instruction and the differential parameter instruction by the active control deviation respectively and then adding to obtain the current active instruction.
The photovoltaic field control apparatus of this embodiment is used to implement the foregoing photovoltaic field control method, and therefore a specific implementation of the photovoltaic field control apparatus can be seen in the foregoing embodiments of the photovoltaic field control method, for example, the substation acquisition module 100, the active instruction deviation module 200, the distribution coefficient module 300, the total station deviation distribution module 400, and the electric energy output module 500 are respectively used to implement steps S101 to S105 in the photovoltaic field control method, so that the specific implementation thereof may refer to descriptions of corresponding embodiments of each part, and details are not repeated here.
The following describes a photovoltaic field control system under a power-limited condition according to an embodiment of the present invention, and the photovoltaic field control system described below, the photovoltaic field control method described above, and the photovoltaic field control apparatus described above may be referred to correspondingly.
Referring to fig. 6, fig. 6 is a block diagram of a photovoltaic field control system under a power-limited condition according to an embodiment of the present invention.
Referring to fig. 4, the photovoltaic farm control system apparatus includes a control substation 11 and a plurality of inverters 12, each of the inverters 12 having a photovoltaic cell connected thereto.
The control substation 11 is configured to:
and acquiring a scheduling command and active commands corresponding to the plurality of inverters 12.
And calculating the active instruction deviation according to the dispatching instruction and the active instructions.
And calculating the distribution coefficient corresponding to each inverter according to the active real-time value, the active instruction and the scheduling instruction of each inverter.
And calculating the total station deviation distribution of each inverter according to the distribution coefficient and the active command deviation.
And sending the station deviation distribution to a corresponding inverter so that the inverter 12 outputs electric energy according to the station deviation distribution.
Preferably, the control substation is specifically configured to:
and subtracting each active instruction from the scheduling instruction to obtain the active instruction deviation.
Preferably, the inverter is used in particular for:
and acquiring the corresponding total station deviation distribution, the active real-time value and the previous active instruction.
And calculating the active control deviation according to the total station deviation distribution, the active real-time value and the previous active instruction.
And calculating a proportional parameter instruction according to the active control deviation and the proportional conversion coefficient.
And calculating an integral parameter instruction according to the active control deviation and the integral conversion coefficient.
And calculating a differential parameter command according to the active control deviation and the differential conversion coefficient.
And calculating the current active instruction according to the proportional parameter instruction, the integral parameter instruction, the differential parameter instruction and the active control deviation.
And outputting corresponding electric energy according to the current active instruction.
Preferably, the inverter is used in particular for:
and adding the real-time active value to the previous active instruction, and subtracting the total station deviation distribution to obtain the active control deviation.
Preferably, the inverter is used in particular for:
and multiplying the absolute value of the active control deviation by a proportional conversion coefficient to obtain a proportional parameter instruction.
And multiplying the absolute value of the active control deviation by the reciprocal of an integral conversion coefficient to obtain an integral parameter instruction.
And multiplying the absolute value of the active control deviation by a differential conversion coefficient to obtain a differential parameter instruction.
Preferably, the inverter is used in particular for:
and multiplying the proportional parameter instruction, the integral parameter instruction and the differential parameter instruction by the active control deviation respectively and then adding to obtain the current active instruction.
The photovoltaic field control system of this embodiment is configured to implement the foregoing photovoltaic field control method, and therefore a specific implementation manner in the photovoltaic field control system may be found in the foregoing embodiment section of the photovoltaic field control method, and therefore, the specific implementation manner thereof may refer to descriptions of corresponding respective section embodiments, and is not described herein again.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The photovoltaic field control method under the electricity limiting condition, the photovoltaic field control device under the electricity limiting condition and the photovoltaic field control system under the electricity limiting condition provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (10)

1. A photovoltaic field control method under a power-limiting condition is characterized by comprising the following steps:
acquiring a scheduling instruction and active instructions corresponding to a plurality of inverters respectively;
calculating an active instruction deviation according to the dispatching instruction and the active instructions;
calculating a distribution coefficient corresponding to each inverter according to an active real-time value, the active instruction and the scheduling instruction of each inverter; the distribution coefficient is used for representing the ratio of an active real-time value of each inverter to the scheduling instruction;
calculating the total station deviation distribution of each inverter according to the distribution coefficient and the active command deviation;
and sending the station deviation distribution to corresponding inverters so that the inverters output electric energy according to the station deviation distribution.
2. The method of claim 1, wherein the calculating the real command deviation from the scheduling command and the plurality of real commands comprises:
and subtracting each active instruction from the scheduling instruction to obtain the active instruction deviation.
3. The method of claim 1 or 2, wherein the step of distributing the output power of the inverter according to the total station deviation comprises:
the inverter acquires the corresponding total station deviation distribution, the active real-time value and the previous active instruction;
calculating an active control deviation according to the total station deviation distribution, the active real-time value and the previous active instruction;
calculating a proportional parameter instruction according to the active control deviation and a proportional conversion coefficient;
calculating an integral parameter instruction according to the active control deviation and an integral conversion coefficient;
calculating a differential parameter instruction according to the active control deviation and the differential conversion coefficient;
calculating a current active instruction according to the proportional parameter instruction, the integral parameter instruction, the differential parameter instruction and the active control deviation;
and outputting corresponding electric energy according to the current active instruction.
4. The method of claim 3, wherein the calculating an active control droop from the total station droop allocation, the active real-time value, and the previous active command comprises:
and adding the real-time active value to the previous active instruction, and subtracting the total station deviation distribution to obtain the active control deviation.
5. The method of claim 4, wherein the calculating the scaling parameter command based on the active control deviation and the scaling factor comprises:
multiplying the absolute value of the active control deviation by a proportional conversion coefficient to obtain a proportional parameter instruction;
the instruction for calculating the integral parameter according to the active control deviation and the integral conversion coefficient comprises the following steps:
multiplying the absolute value of the active control deviation by the reciprocal of an integral conversion coefficient to obtain an integral parameter instruction;
the calculating of the differential parameter command according to the active control deviation and the differential conversion coefficient includes:
and multiplying the absolute value of the active control deviation by a differential conversion coefficient to obtain a differential parameter instruction.
6. The method of claim 5, wherein the calculating a current active command from the proportional parameter command, the integral parameter command, the derivative parameter command, and the active control deviation comprises:
and multiplying the proportional parameter instruction, the integral parameter instruction and the differential parameter instruction by the active control deviation respectively and then adding to obtain the current active instruction.
7. A photovoltaic field control apparatus under limited electrical conditions, comprising:
the substation acquisition module is used for acquiring a scheduling instruction and active instructions corresponding to the plurality of inverters;
the active instruction deviation module is used for calculating active instruction deviation according to the scheduling instruction and the active instructions;
the distribution coefficient module is used for calculating a distribution coefficient corresponding to each inverter according to an active real-time value of each inverter, the active instruction and the scheduling instruction;
the total station deviation distribution module is used for calculating total station deviation distribution of each inverter according to the distribution coefficient and the active instruction deviation;
and the electric energy output module is used for transmitting the station deviation distribution to the corresponding inverter so that the inverter outputs electric energy according to the station deviation distribution.
8. The apparatus of claim 7, further comprising:
the inverter acquisition module is used for acquiring the corresponding total station deviation distribution, the active real-time value and the previous active instruction by an inverter;
an active control deviation module, configured to calculate an active control deviation according to the total station deviation allocation, the active real-time value, and the previous active instruction;
the proportional parameter instruction module is used for calculating a proportional parameter instruction according to the active control deviation and the proportional conversion coefficient;
the integral parameter instruction module is used for calculating an integral parameter instruction according to the active control deviation and an integral conversion coefficient;
the differential parameter instruction module is used for calculating a differential parameter instruction according to the active control deviation and the differential conversion coefficient;
the active instruction module is used for calculating a current active instruction according to the proportional parameter instruction, the integral parameter instruction, the differential parameter instruction and the active control deviation;
and the inverter electric energy output module is used for outputting corresponding electric energy according to the current active instruction.
9. A photovoltaic field control system under the condition of electricity limitation is characterized by comprising a control substation and a plurality of inverters, wherein each inverter is connected with a photovoltaic cell;
the control substation is used for:
acquiring a scheduling instruction and active instructions corresponding to a plurality of inverters respectively;
calculating an active instruction deviation according to the dispatching instruction and the active instructions;
calculating a distribution coefficient corresponding to each inverter according to an active real-time value, the active instruction and the scheduling instruction of each inverter;
calculating the total station deviation distribution of each inverter according to the distribution coefficient and the active command deviation;
and sending the station deviation distribution to corresponding inverters so that the inverters output electric energy according to the station deviation distribution.
10. The system of claim 9, wherein the inverter is specifically configured to:
acquiring the corresponding total station deviation distribution, the active real-time value and the previous active instruction;
calculating an active control deviation according to the total station deviation distribution, the active real-time value and the previous active instruction;
calculating a proportional parameter instruction according to the active control deviation and a proportional conversion coefficient;
calculating an integral parameter instruction according to the active control deviation and an integral conversion coefficient;
calculating a differential parameter instruction according to the active control deviation and the differential conversion coefficient;
calculating a current active instruction according to the proportional parameter instruction, the integral parameter instruction, the differential parameter instruction and the active control deviation;
and outputting corresponding electric energy according to the current active instruction.
CN202110741581.4A 2021-06-30 2021-06-30 Photovoltaic field control method, device and system under power limiting condition Pending CN113452088A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117318024A (en) * 2023-09-19 2023-12-29 华能澜沧江水电股份有限公司 CNN neural network-based photovoltaic power generation power prediction management method and system
CN117767306A (en) * 2023-12-29 2024-03-26 杭州久益电力科技有限公司 Method, system and storage medium for short-time correction of network load deviation by using flexible resources

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117318024A (en) * 2023-09-19 2023-12-29 华能澜沧江水电股份有限公司 CNN neural network-based photovoltaic power generation power prediction management method and system
CN117767306A (en) * 2023-12-29 2024-03-26 杭州久益电力科技有限公司 Method, system and storage medium for short-time correction of network load deviation by using flexible resources

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