CN111509787A - Control method and device for photovoltaic power station to participate in power grid frequency adjustment - Google Patents
Control method and device for photovoltaic power station to participate in power grid frequency adjustment Download PDFInfo
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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
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- 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
Abstract
The invention relates to a control method and a device for a photovoltaic power station to participate in power grid frequency regulation, wherein the control method comprises the following steps: determining an active power instruction value of a photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation according to the frequency of the high-voltage side of a box-type transformer of the photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation and the grid-connected point frequency of the photovoltaic power station participating in power grid frequency regulation; the active power of the photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency regulation is regulated to be the active power instruction value of each photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation; the method and the device improve the regulation speed and the regulation precision of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation, and further improve the performance of the photovoltaic power station participating in the power grid frequency regulation.
Description
Technical Field
The invention relates to the technical field of power grid frequency regulation, in particular to a control method and a control device for a photovoltaic power station to participate in power grid frequency regulation.
Background
The frequency of the power grid is maintained near the rated value, which is one of the main targets of safe and stable operation of the power grid, but the new energy power generation generally presents weak inertia or zero inertia. With the increase of the power generation ratio of new energy, the reduction of the power generation ratio of the conventional power supply enables the rotational inertia of the whole power grid system to be small, the power grid has poor disturbance bearing capacity, and the fluctuation of frequency is obvious.
At present, the photovoltaic power station mainly has two modes for participating in power grid frequency regulation: the method is characterized in that a frequency modulation control system is installed at a photovoltaic power station end, an active control instruction is sent to each photovoltaic power generation unit through the frequency modulation control system to actively support power grid frequency control, and a frequency modulation control module is added in the control system of the photovoltaic power generation unit to actively support power grid frequency control. The first mode has the problems that a large number of telemetering and remote adjusting signals need to be transmitted through remote communication, the response and adjustment speed of a system is slow, the second mode has the problems that the network loss in a station is not considered, the coordination is lacked among the photovoltaic power generation units, and if some photovoltaic power generation units are in a fault state or cannot perform power adjustment or the power adjustment is not in place, the whole power station cannot meet the frequency modulation requirement of a power grid.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a control method and a control device for a photovoltaic power station to participate in power grid frequency regulation, so that the regulation speed and the regulation precision of a photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation are improved, and the performance of the photovoltaic power station participating in power grid frequency regulation is further improved.
The purpose of the invention is realized by adopting the following technical scheme:
the invention provides a control method for a photovoltaic power station to participate in power grid frequency regulation, which is improved in that the method comprises the following steps:
determining an active power instruction value of a photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation according to the frequency of the high-voltage side of a box-type transformer of the photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation and the grid-connected point frequency of the photovoltaic power station participating in power grid frequency regulation;
and adjusting the active power of the corresponding photovoltaic power generation unit according to the active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment.
Preferably, the determining the active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment according to the frequency of the high-voltage side of the box transformer of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment and the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency adjustment includes:
determining a first regulation reference value of a photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation according to the frequency of the high-voltage side of a box-type transformer of the photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation;
determining a second regulation reference value of a photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation;
and determining the active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the first regulation reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation and the second regulation reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation.
Further, the determining a first adjustment reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment according to the frequency of the high-voltage side of the box transformer of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment includes:
determining a first regulation reference value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the following formulai,1：
Pi,1＝Pi,0+ΔPi,1
In the formula, if Pi,1∈[Pi,min,Pi,max]Then P isi,1＝Pi,1If P isi,1＞Pi,maxThen P isi,1＝Pi,maxIf P isi,1＜Pi,minThen P isi,1＝Pi,min，Pi,maxFor the maximum value of the active power, P, of the ith photovoltaic power generation unit in the photovoltaic power station participating in the regulation of the grid frequencyi,minFor the minimum value of the active power, P, of the ith photovoltaic power generation unit in the photovoltaic power station participating in the regulation of the grid frequencyi,0For the initial active power instruction value, delta P, of the ith photovoltaic power generation unit in the photovoltaic power station participating in the grid frequency regulationi,1And i ∈ n is the first adjustment quantity of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment, and n is the total number of the photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency adjustment.
Further, if the frequency of the high-voltage side of the box-type transformer of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation does not exceed the preset dead zone, the first regulation quantity delta P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulationi,10; if the frequency of the high-voltage side of the box-type transformer of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment exceeds a preset dead zone, determining a first adjustment quantity delta P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment according to the following formulai,1：
In the formula (f)iIn order to adjust the frequency of the high-voltage side of the box-type transformer of the ith photovoltaic power generation unit in the photovoltaic power station participating in the frequency adjustment of the power grid,fLto preset lower limit of dead zone, fHFor presetting an upper limit value of the dead zone, Pi arrayAnd k is an adjusting coefficient, wherein the k is the rated capacity of the ith photovoltaic power generation unit in the photovoltaic power station participating in the adjustment of the power grid frequency.
Further, the determining a second adjustment reference value of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment according to the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency adjustment includes:
determining a second regulation reference value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the following formulai,2：
Of formula (II) to (III)'0For the initial active power command value, P, of the photovoltaic power station participating in the regulation of the grid frequencyoutFor the grid-connected point active power measurement, delta P, of the photovoltaic power station participating in the regulation of the grid frequency2And n is the total number of photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency regulation and is an active power dead zone of the photovoltaic power station participating in the power grid frequency regulation.
Further, if the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation does not exceed a preset dead zone, the regulation quantity delta P of the photovoltaic power station participating in the power grid frequency regulation20; if the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation exceeds a preset dead zone, determining the regulation quantity delta P of the photovoltaic power station participating in the power grid frequency regulation according to the following formula2：
Wherein f is the grid-connected point frequency of the photovoltaic power station participating in the regulation of the grid frequency, fLTo preset lower limit of dead zone, fHIs the upper limit value of the preset dead zone, k is the regulating coefficient,
the method is the rated capacity of the photovoltaic power station participating in the power grid frequency regulation.
Further, the determining an active power instruction value of the photovoltaic power generation unit participating in the grid frequency regulation according to the first regulation reference value of the photovoltaic power generation unit participating in the grid frequency regulation and the second regulation reference value of the photovoltaic power generation unit participating in the grid frequency regulation includes:
determining an active power instruction value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation according to the following formulai：
Pi＝Pi,1+Pi,2
In the formula, if Pi∈[Pi,min,Pi,max]Then P isi＝PiIf P isi＞Pi,maxThen P isi＝Pi,maxIf P isi＜Pi,minThen P isi＝Pi,min。
The invention also provides a control device for the photovoltaic power station to participate in the frequency regulation of the power grid, and the improvement is that the device comprises:
the determining unit is used for determining an active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the frequency of the high-voltage side of the box-type transformer of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation and the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation;
and the control unit is used for carrying out active power regulation on the corresponding photovoltaic power generation unit according to the active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation.
Preferably, the determining unit is specifically configured to:
determining a first regulation reference value of a photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation according to the frequency of the high-voltage side of a box-type transformer of the photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation;
determining a second regulation reference value of a photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation;
and determining the active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the first regulation reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation and the second regulation reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation.
Further, the determining a first adjustment reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment according to the frequency of the high-voltage side of the box transformer of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment includes:
determining a first regulation reference value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the following formulai,1：
Pi,1＝Pi,0+ΔPi,1
In the formula, if Pi,1∈[Pi,min,Pi,max]Then P isi,1＝Pi,1If P isi,1＞Pi,maxThen P isi,1＝Pi,maxIf P isi,1＜Pi,minThen P isi,1＝Pi,min，Pi,maxFor the maximum value of the active power, P, of the ith photovoltaic power generation unit in the photovoltaic power station participating in the regulation of the grid frequencyi,minFor the minimum value of the active power, P, of the ith photovoltaic power generation unit in the photovoltaic power station participating in the regulation of the grid frequencyi,0For the initial active power instruction value, delta P, of the ith photovoltaic power generation unit in the photovoltaic power station participating in the grid frequency regulationi,1And i ∈ n is the first adjustment quantity of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment, and n is the total number of the photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency adjustment.
Further, if the frequency of the high-voltage side of the box-type transformer of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation does not exceed the preset frequencyAnd in the region, the first regulating quantity delta P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulationi,10; if the frequency of the high-voltage side of the box-type transformer of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment exceeds a preset dead zone, determining a first adjustment quantity delta P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment according to the following formulai,1：
In the formula (f)iFor the frequency, f, of the high-voltage side of the box transformer of the ith photovoltaic power generation unit in the photovoltaic power station participating in the regulation of the grid frequencyLTo preset lower limit of dead zone, fHFor presetting an upper limit value of the dead zone, Pi arrayAnd k is an adjusting coefficient, wherein the k is the rated capacity of the ith photovoltaic power generation unit in the photovoltaic power station participating in the adjustment of the power grid frequency.
Further, the determining a second adjustment reference value of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment according to the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency adjustment includes:
determining a second regulation reference value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the following formulai,2：
Of formula (II) to (III)'0For the initial active power command value, P, of the photovoltaic power station participating in the regulation of the grid frequencyoutFor the grid-connected point active power measurement, delta P, of the photovoltaic power station participating in the regulation of the grid frequency2And n is the total number of photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency regulation and is an active power dead zone of the photovoltaic power station participating in the power grid frequency regulation.
Further, if the participation isIf the grid-connected point frequency of the photovoltaic power station with the power grid frequency regulation does not exceed the preset dead zone, the regulation quantity delta P of the photovoltaic power station participating in the power grid frequency regulation20; if the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation exceeds a preset dead zone, determining the regulation quantity delta P of the photovoltaic power station participating in the power grid frequency regulation according to the following formula2：
Wherein f is the grid-connected point frequency of the photovoltaic power station participating in the regulation of the grid frequency, fLTo preset lower limit of dead zone, fHIs the upper limit value of the preset dead zone, k is the regulating coefficient,
the method is the rated capacity of the photovoltaic power station participating in the power grid frequency regulation.
Further, the determining an active power instruction value of the photovoltaic power generation unit participating in the grid frequency regulation according to the first regulation reference value of the photovoltaic power generation unit participating in the grid frequency regulation and the second regulation reference value of the photovoltaic power generation unit participating in the grid frequency regulation includes:
determining an active power instruction value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation according to the following formulai：
Pi＝Pi,1+Pi,2
In the formula, if Pi∈[Pi,min,Pi,max]Then P isi＝PiIf P isi＞Pi,maxThen P isi＝Pi,maxIf P isi＜Pi,minThen P isi＝Pi,min。
Compared with the closest prior art, the invention has the following beneficial effects:
the invention provides a control method and a control device for a photovoltaic power station to participate in power grid frequency regulation, wherein an active power instruction value of a photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation is determined according to the frequency of the high-voltage side of a box-type transformer of the photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation and the grid-connected point frequency of the photovoltaic power station participating in power grid frequency regulation; the regulation speed and the regulation precision of the photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation are improved, and the performance of the photovoltaic power station participating in power grid frequency regulation is further improved; the method and the device have the advantages that the adjustment instruction value is corrected by using the active power measurement value of the grid-connected point of the photovoltaic power station, so that the accuracy of the photovoltaic power generation unit participating in the power grid frequency adjustment in the photovoltaic power station participating in the power grid frequency adjustment is improved.
Drawings
FIG. 1 is a flow chart of a control method for a photovoltaic power generation unit to participate in grid frequency regulation according to the present invention;
fig. 2 is a schematic diagram of a control device for the photovoltaic power generation unit to participate in the grid frequency regulation.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present 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.
The invention provides a control method for a photovoltaic power station to participate in power grid frequency regulation, which comprises the following steps of:
step 1, determining an active power instruction value of a photovoltaic power generation unit in a photovoltaic power station participating in power grid frequency regulation according to the frequency of the high-voltage side of a box-type transformer of the photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation and the grid-connected point frequency of the photovoltaic power station participating in power grid frequency regulation;
and 2, performing active power regulation on the corresponding photovoltaic power generation units according to active power instruction values of the photovoltaic power generation units in the photovoltaic power station participating in power grid frequency regulation.
In the control method, the step 1 of determining the active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the frequency of the high-voltage side of the box-type transformer of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation and the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation comprises the following steps:
determining a first regulation reference value of a photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation according to the frequency of the high-voltage side of a box-type transformer of the photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation;
determining a second regulation reference value of a photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation;
and determining the active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the first regulation reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation and the second regulation reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation.
Further, the determining a first adjustment reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment according to the frequency of the high-voltage side of the box transformer of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment includes:
determining a first regulation reference value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the following formulai,1：
Pi,1＝Pi,0+ΔPi,1
In the formula, if Pi,1∈[Pi,min,Pi,max]Then P isi,1＝Pi,1If P isi,1＞Pi,maxThen P isi,1＝Pi,maxIf P isi,1＜Pi,minThen P isi,1＝Pi,min，Pi,maxFor participating in regulation of frequency of electric networkMaximum value of active power, P, of ith photovoltaic power generation unit in photovoltaic power stationi,minFor the minimum value of the active power, P, of the ith photovoltaic power generation unit in the photovoltaic power station participating in the regulation of the grid frequencyi,0For the initial active power instruction value, delta P, of the ith photovoltaic power generation unit in the photovoltaic power station participating in the grid frequency regulationi,1And i ∈ n is the first adjustment quantity of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment, and n is the total number of the photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency adjustment.
Further, if the frequency of the high-voltage side of the box-type transformer of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation does not exceed the preset dead zone, the first regulation quantity delta P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulationi,10; if the frequency of the high-voltage side of the box-type transformer of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment exceeds a preset dead zone, determining a first adjustment quantity delta P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment according to the following formulai,1：
In the formula (f)iFor the frequency, f, of the high-voltage side of the box transformer of the ith photovoltaic power generation unit in the photovoltaic power station participating in the regulation of the grid frequencyLTo preset lower limit of dead zone, fHFor presetting an upper limit value of the dead zone, Pi arrayAnd k is an adjusting coefficient, wherein the k is the rated capacity of the ith photovoltaic power generation unit in the photovoltaic power station participating in the adjustment of the power grid frequency.
Further, the determining a second adjustment reference value of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment according to the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency adjustment includes:
determining a second regulation reference value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the following formulai,2：
Of formula (II) to (III)'0For the initial active power command value, P, of the photovoltaic power station participating in the regulation of the grid frequencyoutFor the grid-connected point active power measurement, delta P, of the photovoltaic power station participating in the regulation of the grid frequency2And n is the total number of photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency regulation and is an active power dead zone of the photovoltaic power station participating in the power grid frequency regulation.
Further, if the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation does not exceed a preset dead zone, the regulation quantity delta P of the photovoltaic power station participating in the power grid frequency regulation20; if the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation exceeds a preset dead zone, determining the regulation quantity delta P of the photovoltaic power station participating in the power grid frequency regulation according to the following formula2：
Wherein f is the grid-connected point frequency of the photovoltaic power station participating in the regulation of the grid frequency, fLTo preset lower limit of dead zone, fHIs the upper limit value of the preset dead zone, k is the regulating coefficient,
the method is the rated capacity of the photovoltaic power station participating in the power grid frequency regulation.
Further, the determining an active power instruction value of the photovoltaic power generation unit participating in the grid frequency regulation according to the first regulation reference value of the photovoltaic power generation unit participating in the grid frequency regulation and the second regulation reference value of the photovoltaic power generation unit participating in the grid frequency regulation includes:
determining an active power instruction value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation according to the following formulai：
Pi＝Pi,1+Pi,2
In the formula, if Pi∈[Pi,min,Pi,max]Then P isi＝PiIf P isi＞Pi,maxThen P isi＝Pi,maxIf P isi＜Pi,minThen P isi＝Pi,min。
The invention also provides a control device for a photovoltaic power station to participate in power grid frequency regulation, as shown in fig. 2, the device comprises:
the determining unit is used for determining an active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the frequency of the high-voltage side of the box-type transformer of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation and the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation;
and the control unit is used for carrying out active power regulation on the corresponding photovoltaic power generation unit according to the active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation.
Preferably, the determining unit is specifically configured to:
determining a first regulation reference value of a photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation according to the frequency of the high-voltage side of a box-type transformer of the photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation;
determining a second regulation reference value of a photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation;
and determining the active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the first regulation reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation and the second regulation reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation.
Further, the determining a first adjustment reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment according to the frequency of the high-voltage side of the box transformer of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment includes:
determining a first regulation reference value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the following formulai,1：
Pi,1＝Pi,0+ΔPi,1
In the formula, if Pi,1∈[Pi,min,Pi,max]Then P isi,1＝Pi,1If P isi,1＞Pi,maxThen P isi,1＝Pi,maxIf P isi,1＜Pi,minThen P isi,1＝Pi,min，Pi,maxFor the maximum value of the active power, P, of the ith photovoltaic power generation unit in the photovoltaic power station participating in the regulation of the grid frequencyi,minFor the minimum value of the active power, P, of the ith photovoltaic power generation unit in the photovoltaic power station participating in the regulation of the grid frequencyi,0For the initial active power instruction value, delta P, of the ith photovoltaic power generation unit in the photovoltaic power station participating in the grid frequency regulationi,1And i ∈ n is the first adjustment quantity of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment, and n is the total number of the photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency adjustment.
Further, if the frequency of the high-voltage side of the box-type transformer of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation does not exceed the preset dead zone, the first regulation quantity delta P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulationi,10; if the frequency of the high-voltage side of the box-type transformer of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment exceeds a preset dead zone, determining a first adjustment quantity delta P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment according to the following formulai,1：
In the formula (f)iIn-photovoltaic power station for participating in power grid frequency regulationFrequency, f, of the high-voltage side of the box transformer of the i photovoltaic power generation unitsLTo preset lower limit of dead zone, fHFor presetting an upper limit value of the dead zone, Pi arrayAnd k is an adjusting coefficient, wherein the k is the rated capacity of the ith photovoltaic power generation unit in the photovoltaic power station participating in the adjustment of the power grid frequency.
Further, the determining a second adjustment reference value of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment according to the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency adjustment includes:
determining a second regulation reference value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the following formulai,2：
Of formula (II) to (III)'0For the initial active power command value, P, of the photovoltaic power station participating in the regulation of the grid frequencyoutFor the grid-connected point active power measurement, delta P, of the photovoltaic power station participating in the regulation of the grid frequency2And n is the total number of photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency regulation and is an active power dead zone of the photovoltaic power station participating in the power grid frequency regulation.
Further, if the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation does not exceed a preset dead zone, the regulation quantity delta P of the photovoltaic power station participating in the power grid frequency regulation20; if the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation exceeds a preset dead zone, determining the regulation quantity delta P of the photovoltaic power station participating in the power grid frequency regulation according to the following formula2：
Wherein f is the grid-connected point frequency of the photovoltaic power station participating in the regulation of the grid frequency, fLTo preset lower limit of dead zone, fHIs the upper limit value of the preset dead zone, k is the regulating coefficient,
the method is the rated capacity of the photovoltaic power station participating in the power grid frequency regulation.
Further, the determining an active power instruction value of the photovoltaic power generation unit participating in the grid frequency regulation according to the first regulation reference value of the photovoltaic power generation unit participating in the grid frequency regulation and the second regulation reference value of the photovoltaic power generation unit participating in the grid frequency regulation includes:
determining an active power instruction value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation according to the following formulai：
Pi＝Pi,1+Pi,2
In the formula, if Pi∈[Pi,min,Pi,max]Then P isi＝PiIf P isi＞Pi,maxThen P isi＝Pi,maxIf P isi＜Pi,minThen P isi＝Pi,min。
In summary, according to the control method and device for the photovoltaic power station to participate in the grid frequency adjustment provided by the invention, the active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in the grid frequency adjustment is determined according to the frequency of the high-voltage side of the box-type transformer of the photovoltaic power generation unit in the photovoltaic power station participating in the grid frequency adjustment and the grid-connected point frequency of the photovoltaic power station participating in the grid frequency adjustment; the regulation speed and the regulation precision of the photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation are improved, and the performance of the photovoltaic power station participating in power grid frequency regulation is further improved; the method and the device have the advantages that the adjustment instruction value is corrected by using the active power measurement value of the grid-connected point of the photovoltaic power station, so that the accuracy of the photovoltaic power generation unit participating in the power grid frequency adjustment in the photovoltaic power station participating in the power grid frequency adjustment is improved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (14)
1. A control method for participation of a photovoltaic power station in grid frequency regulation is characterized by comprising the following steps:
determining an active power instruction value of a photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation according to the frequency of the high-voltage side of a box-type transformer of the photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation and the grid-connected point frequency of the photovoltaic power station participating in power grid frequency regulation;
and adjusting the active power of the corresponding photovoltaic power generation unit according to the active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment.
2. The method of claim 1, wherein determining the active power command values for photovoltaic power generating units within the photovoltaic power plant participating in the grid frequency regulation based on the frequency of the high voltage side of the box transformer of the photovoltaic power generating units within the photovoltaic power plant participating in the grid frequency regulation and the grid point frequency of the photovoltaic power plant participating in the grid frequency regulation comprises:
determining a first regulation reference value of a photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation according to the frequency of the high-voltage side of a box-type transformer of the photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation;
determining a second regulation reference value of a photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation;
and determining the active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the first regulation reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation and the second regulation reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation.
3. The method of claim 2, wherein determining a first regulation reference value for photovoltaic power generation units within the photovoltaic power plant participating in grid frequency regulation based on the frequency of the high-voltage side of the box transformer of the photovoltaic power generation units within the photovoltaic power plant participating in grid frequency regulation comprises:
determining a first regulation reference value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the following formulai,1：
Pi,1＝Pi,0+ΔPi,1
In the formula, if Pi,1∈[Pi,min,Pi,max]Then P isi,1＝Pi,1If P isi,1＞Pi,maxThen P isi,1＝Pi,maxIf P isi,1＜Pi,minThen P isi,1＝Pi,min，Pi,maxFor the maximum value of the active power, P, of the ith photovoltaic power generation unit in the photovoltaic power station participating in the regulation of the grid frequencyi,minFor the minimum value of the active power, P, of the ith photovoltaic power generation unit in the photovoltaic power station participating in the regulation of the grid frequencyi,0For the initial active power instruction value, delta P, of the ith photovoltaic power generation unit in the photovoltaic power station participating in the grid frequency regulationi,1And i ∈ n is the first adjustment quantity of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment, and n is the total number of the photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency adjustment.
4. The method according to claim 3, characterized in that the first regulating quantity Δ P of the ith photovoltaic power generation unit in the photovoltaic power plant participating in the grid frequency regulation is a first regulating quantity Δ P if the frequency of the high-voltage side of the box transformer of the ith photovoltaic power generation unit in the photovoltaic power plant participating in the grid frequency regulation does not exceed a preset dead zonei,10; if the frequency of the high-voltage side of the box-type transformer of the ith photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation exceeds a preset dead zone, determining according to the following formulaDetermining a first regulating quantity delta P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulationi,1：
In the formula (f)iFor the frequency, f, of the high-voltage side of the box transformer of the ith photovoltaic power generation unit in the photovoltaic power station participating in the regulation of the grid frequencyLTo preset lower limit of dead zone, fHFor presetting an upper limit value of the dead zone, Pi arrayAnd k is an adjusting coefficient, wherein the k is the rated capacity of the ith photovoltaic power generation unit in the photovoltaic power station participating in the adjustment of the power grid frequency.
5. The method of claim 2, wherein said determining a second regulation reference value for an ith photovoltaic power generation unit within said grid frequency regulation-participating photovoltaic power plant based on a grid point frequency of said grid frequency regulation-participating photovoltaic power plant comprises:
determining a second regulation reference value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the following formulai,2：
In the formula, P0' is the initial active power command value, P, of the photovoltaic power station involved in the grid frequency regulationoutFor the grid-connected point active power measurement, delta P, of the photovoltaic power station participating in the regulation of the grid frequency2And n is the total number of photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency regulation and is an active power dead zone of the photovoltaic power station participating in the power grid frequency regulation.
6. The method according to claim 5, characterized in that the grid-tie point frequency of the photovoltaic power plant participating in the grid frequency regulation does not exceed a preset dead zoneThe regulating variable delta P of the photovoltaic power station participating in the regulation of the power grid frequency20; if the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation exceeds a preset dead zone, determining the regulation quantity delta P of the photovoltaic power station participating in the power grid frequency regulation according to the following formula2：
Wherein f is the grid-connected point frequency of the photovoltaic power station participating in the regulation of the grid frequency, fLTo preset lower limit of dead zone, fHIs the upper limit value of the preset dead zone, k is the regulating coefficient,
the method is the rated capacity of the photovoltaic power station participating in the power grid frequency regulation.
7. The method of claim 2, wherein determining the active power command value for the photovoltaic power generation unit participating in the grid frequency regulation according to the first regulation reference value for the photovoltaic power generation unit participating in the grid frequency regulation and the second regulation reference value for the photovoltaic power generation unit participating in the grid frequency regulation comprises:
determining an active power instruction value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation according to the following formulai：
Pi＝Pi,1+Pi,2
In the formula, if Pi∈[Pi,min,Pi,max]Then P isi＝PiIf P isi＞Pi,maxThen P isi＝Pi,maxIf P isi＜Pi,minThen P isi＝Pi,min。
8. A control arrangement for a photovoltaic power plant to participate in grid frequency regulation, the arrangement comprising:
the determining unit is used for determining an active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the frequency of the high-voltage side of the box-type transformer of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation and the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation;
and the control unit is used for carrying out active power regulation on the corresponding photovoltaic power generation unit according to the active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation.
9. The apparatus of claim 8, wherein the determination unit is specifically configured to:
determining a first regulation reference value of a photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation according to the frequency of the high-voltage side of a box-type transformer of the photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation;
determining a second regulation reference value of a photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation;
and determining the active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the first regulation reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation and the second regulation reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation.
10. The apparatus of claim 9, wherein said determining a first regulation reference value for photovoltaic power generating units within said photovoltaic plant participating in grid frequency regulation based on the frequency of the high voltage side of the box transformer of said photovoltaic power generating units within said photovoltaic plant participating in grid frequency regulation comprises:
determining a first regulation reference value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the following formulai,1：
Pi,1＝Pi,0+ΔPi,1
In the formula, if Pi,1∈[Pi,min,Pi,max]Then P isi,1＝Pi,1If P isi,1＞Pi,maxThen P isi,1＝Pi,maxIf P isi,1＜Pi,minThen P isi,1＝Pi,min，Pi,maxFor the maximum value of the active power, P, of the ith photovoltaic power generation unit in the photovoltaic power station participating in the regulation of the grid frequencyi,minFor the minimum value of the active power, P, of the ith photovoltaic power generation unit in the photovoltaic power station participating in the regulation of the grid frequencyi,0For the initial active power instruction value, delta P, of the ith photovoltaic power generation unit in the photovoltaic power station participating in the grid frequency regulationi,1And i ∈ n is the first adjustment quantity of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment, and n is the total number of the photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency adjustment.
11. The apparatus according to claim 10, wherein the first adjustment amount Δ P for the ith pv power generation unit in the pv power plant participating in the grid frequency adjustment is determined if the frequency on the high-voltage side of the box transformer of the ith pv power generation unit in the pv power plant not exceeding the preset dead bandi,10; if the frequency of the high-voltage side of the box-type transformer of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment exceeds a preset dead zone, determining a first adjustment quantity delta P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment according to the following formulai,1：
In the formula (f)iFor the frequency, f, of the high-voltage side of the box transformer of the ith photovoltaic power generation unit in the photovoltaic power station participating in the regulation of the grid frequencyLTo preset lower limit of dead zone, fHFor presetting an upper limit value of the dead zone, Pi arrayAnd k is an adjusting coefficient, wherein the k is the rated capacity of the ith photovoltaic power generation unit in the photovoltaic power station participating in the adjustment of the power grid frequency.
12. The apparatus of claim 9, wherein said determining a second regulation reference value for an ith photovoltaic power generation unit within said grid frequency regulation-participating photovoltaic power plant based on a grid point frequency of said grid frequency regulation-participating photovoltaic power plant comprises:
determining a second regulation reference value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation according to the following formulai,2：
In the formula, P0' is the initial active power command value, P, of the photovoltaic power station involved in the grid frequency regulationoutFor the grid-connected point active power measurement, delta P, of the photovoltaic power station participating in the regulation of the grid frequency2And n is the total number of photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency regulation and is an active power dead zone of the photovoltaic power station participating in the power grid frequency regulation.
13. The apparatus according to claim 12, wherein the adjustment quantity Δ P of the photovoltaic power station participating in the grid frequency adjustment is determined if the grid point frequency of the photovoltaic power station participating in the grid frequency adjustment does not exceed a preset dead zone20; if the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency regulation exceeds a preset dead zone, determining the regulation quantity delta P of the photovoltaic power station participating in the power grid frequency regulation according to the following formula2：
Wherein f is the grid-connected point frequency of the photovoltaic power station participating in the regulation of the grid frequency, fLTo preset lower limit of dead zone, fHIs the upper limit value of the preset dead zone, k is the regulating coefficient,
the method is the rated capacity of the photovoltaic power station participating in the power grid frequency regulation.
14. The apparatus of claim 9, wherein the determining the active power command value of the photovoltaic power generation unit participating in the grid frequency regulation according to the first regulation reference value of the photovoltaic power generation unit participating in the grid frequency regulation and the second regulation reference value of the photovoltaic power generation unit participating in the grid frequency regulation comprises:
determining an active power instruction value P of the ith photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation according to the following formulai：
Pi＝Pi,1+Pi,2
In the formula, if Pi∈[Pi,min,Pi,max]Then P isi＝PiIf P isi＞Pi,maxThen P isi＝Pi,maxIf P isi＜Pi,minThen P isi＝Pi,min。
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| CN106816890A (en) * | 2016-09-30 | 2017-06-09 | 中国电力科学研究院 | A kind of photovoltaic plant frequency adjustment method and system |
| CN107749644A (en) * | 2017-11-29 | 2018-03-02 | 国电联合动力技术有限公司 | A kind of wind power plant participates in the intelligent control method and its control system of primary frequency modulation |
| CN109038614A (en) * | 2018-07-12 | 2018-12-18 | 中国电力科学研究院有限公司 | A kind of photovoltaic plant participates in the control method and system of system frequency modulation |
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| CN106816890A (en) * | 2016-09-30 | 2017-06-09 | 中国电力科学研究院 | A kind of photovoltaic plant frequency adjustment method and system |
| CN107749644A (en) * | 2017-11-29 | 2018-03-02 | 国电联合动力技术有限公司 | A kind of wind power plant participates in the intelligent control method and its control system of primary frequency modulation |
| CN109038614A (en) * | 2018-07-12 | 2018-12-18 | 中国电力科学研究院有限公司 | A kind of photovoltaic plant participates in the control method and system of system frequency modulation |
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