CN111509787B - Control method and device for participation of photovoltaic power station in power grid frequency adjustment - Google Patents
Control method and device for participation of photovoltaic power station in power grid frequency adjustment Download PDFInfo
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- CN111509787B CN111509787B CN201910099383.5A CN201910099383A CN111509787B CN 111509787 B CN111509787 B CN 111509787B CN 201910099383 A CN201910099383 A CN 201910099383A CN 111509787 B CN111509787 B CN 111509787B
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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
- 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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Abstract
The application 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 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-type 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; the method comprises the steps of adjusting the active power of photovoltaic power generation units in a photovoltaic power station participating in power grid frequency adjustment to be the active power instruction value of each photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency adjustment; according to the application, the regulating speed and the regulating precision of the photovoltaic power generation units in the photovoltaic power station participating in the regulation of the power grid frequency are improved, and the performance of the photovoltaic power station participating in the regulation of the power grid frequency is further improved.
Description
Technical Field
The application relates to the technical field of power grid frequency regulation, in particular to a control method and device for a photovoltaic power station to participate in power grid frequency regulation.
Background
Maintaining the grid frequency near the rated value is one of the main targets of safe and stable operation of the grid, but new energy power generation generally presents weak inertia or zero inertia. With the increase of the new energy power generation proportion and the decrease of the conventional power generation proportion, the whole power grid system has small rotational inertia, the power grid has poor disturbance bearing capacity and the fluctuation of frequency is obvious.
At present, two main modes of the photovoltaic power station participating in the regulation of the power grid frequency exist: one is to install a frequency modulation control system at the station end of the photovoltaic power station, and send an active control instruction to each photovoltaic power generation unit through the frequency modulation control system to actively support the power grid frequency control, and the other is to actively support the power grid frequency control through adding a frequency modulation control module in the control system of the photovoltaic power generation unit. The first method has the problems that a large number of remote measurement and remote adjustment signals are required to be transmitted through remote communication, the response and adjustment speed of the system are slow, and the second method has the problems that network losses in the station are not considered and coordination among the two is not achieved, and if some photovoltaic power generation units are in a fault state or other reasons, power adjustment cannot be carried out or the power adjustment cannot be carried out 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 application aims to provide a control method and a device for the participation of a photovoltaic power station in the regulation of the power grid frequency, which improve the regulation speed and the regulation precision of a photovoltaic power generation unit in the photovoltaic power station in the regulation of the power grid frequency, thereby improving the performance of the photovoltaic power station in the regulation of the power grid frequency.
The application aims at adopting the following technical scheme:
the application 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 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-type 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;
and carrying out active power adjustment on the corresponding photovoltaic power generation units according to the active power instruction values of the photovoltaic power generation units 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 connection point frequency of the photovoltaic power station participating in the power grid frequency adjustment includes:
determining a first regulation reference 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;
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 an 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 first adjustment reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment and the second adjustment reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment.
Further, the determining the 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-type 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 an ith photovoltaic power generation unit in a photovoltaic power plant involved in grid frequency regulation as follows i,1 ：
P i,1 ＝P i,0 +ΔP i,1
In the formula, if P i,1 ∈[P i,min ,P i,max ]P is then i,1 ＝P i,1 If P i,1 ＞P i,max P is then i,1 ＝P i,max If P i,1 ＜P i,min P is then i,1 ＝P i,min ，P i,max Active power maximum value, P, of an ith photovoltaic power generation unit in a photovoltaic power station participating in grid frequency regulation i,min Active power minimum value, P, of ith photovoltaic power generation unit in photovoltaic power station participating in power grid frequency adjustment i,0 For the initial active power command value, ΔP, of the ith photovoltaic power generation unit in a photovoltaic power plant involved in grid frequency regulation i,1 And (3) the first adjustment quantity of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment, wherein i epsilon 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 adjustment does not exceed the preset dead zone, the first adjustment quantity Δp of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment i,1 =0; 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 formula i,1 ：
Wherein f i For 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, f L Is the lower limit value of the preset dead zone, f H To preset the upper limit value of the dead zone, P i array And k is an adjusting coefficient for rated capacity of an ith photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency adjustment.
Further, the determining the 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 an ith photovoltaic power generation unit in a photovoltaic power plant involved in grid frequency regulation as follows i,2 ：
Wherein P' 0 For the initial active power command value, P, of the photovoltaic power plant involved in the regulation of the grid frequency out For the grid-connected point active power measurement value delta P of the photovoltaic power station participating in the grid frequency adjustment 2 And n is the total number of photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency regulation, and delta is the 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 grid frequency adjustment does not exceed the preset dead zone, the adjustment quantity delta P of the photovoltaic power station participating in the grid frequency adjustment 2 =0; if the grid-connected point frequency of the photovoltaic power station participating in the grid frequency adjustment exceeds a preset dead zone, determining the adjustment quantity delta P of the photovoltaic power station participating in the grid frequency adjustment according to the following formula 2 ：
Wherein f is the grid-connected point frequency of the photovoltaic power station participating in the regulation of the grid frequency, and f L Is the lower limit value of the preset dead zone, f H For the upper limit value of the preset dead zone, k is the adjustment coefficient,for the rated capacity of photovoltaic power stations involved in the regulation of the grid frequency.
Further, the determining the active power instruction value of the photovoltaic power generation unit participating in the power grid frequency adjustment according to the first adjustment reference value of the photovoltaic power generation unit participating in the power grid frequency adjustment and the second adjustment reference value of the photovoltaic power generation unit participating in the power grid frequency adjustment includes:
determining an active power command value P of an ith photovoltaic power generation unit in a photovoltaic power station participating in power grid frequency adjustment according to the following formula i ：
P i ＝P i,1 +P i,2
In the formula, if P i ∈[P i,min ,P i,max ]P is then i ＝P i If P i ＞P i,max P is then i ＝P i,max If P i ＜P i,min P is then i ＝P i,min 。
The application also provides a control device for the photovoltaic power station to participate in the frequency regulation of the power grid, which is characterized in 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 adjustment 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 adjustment and the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency adjustment;
and the control unit is used for carrying out active power adjustment on the corresponding photovoltaic power generation units according to the active power instruction values of the photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency adjustment.
Preferably, the determining unit is specifically configured to:
determining a first regulation reference 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;
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 an 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 first adjustment reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment and the second adjustment reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment.
Further, the determining the 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-type 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 an ith photovoltaic power generation unit in a photovoltaic power plant involved in grid frequency regulation as follows i,1 ：
P i,1 ＝P i,0 +ΔP i,1
In the formula, if P i,1 ∈[P i,min ,P i,max ]P is then i,1 ＝P i,1 If P i,1 ＞P i,max P is then i,1 ＝P i,max If P i,1 ＜P i,min P is then i,1 ＝P i,min ，P i,max Active power maximum value, P, of an ith photovoltaic power generation unit in a photovoltaic power station participating in grid frequency regulation i,min Active power minimum value, P, of ith photovoltaic power generation unit in photovoltaic power station participating in power grid frequency adjustment i,0 For the initial active power command value, ΔP, of the ith photovoltaic power generation unit in a photovoltaic power plant involved in grid frequency regulation i,1 And (3) the first adjustment quantity of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment, wherein i epsilon 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 adjustment does not exceed the preset dead zone, the first adjustment quantity Δp of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment i,1 =0; 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 formula i,1 ：
Wherein f i For 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, f L For a preset dead zoneLower limit value f H To preset the upper limit value of the dead zone, P i array And k is an adjusting coefficient for rated capacity of an ith photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency adjustment.
Further, the determining the 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 an ith photovoltaic power generation unit in a photovoltaic power plant involved in grid frequency regulation as follows i,2 ：
Wherein P' 0 For the initial active power command value, P, of the photovoltaic power plant involved in the regulation of the grid frequency out For the grid-connected point active power measurement value delta P of the photovoltaic power station participating in the grid frequency adjustment 2 And n is the total number of photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency regulation, and delta is the 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 grid frequency adjustment does not exceed the preset dead zone, the adjustment quantity delta P of the photovoltaic power station participating in the grid frequency adjustment 2 =0; if the grid-connected point frequency of the photovoltaic power station participating in the grid frequency adjustment exceeds a preset dead zone, determining the adjustment quantity delta P of the photovoltaic power station participating in the grid frequency adjustment according to the following formula 2 ：
Wherein f is the grid-connected point frequency of the photovoltaic power station participating in the regulation of the grid frequency, and f L Is the lower limit value of the preset dead zone, f H For the upper limit value of the preset dead zone, k is the tuningThe coefficient of the node is calculated,for the rated capacity of photovoltaic power stations involved in the regulation of the grid frequency.
Further, the determining the active power instruction value of the photovoltaic power generation unit participating in the power grid frequency adjustment according to the first adjustment reference value of the photovoltaic power generation unit participating in the power grid frequency adjustment and the second adjustment reference value of the photovoltaic power generation unit participating in the power grid frequency adjustment includes:
determining an active power command value P of an ith photovoltaic power generation unit in a photovoltaic power station participating in power grid frequency adjustment according to the following formula i ：
P i ＝P i,1 +P i,2
In the formula, if P i ∈[P i,min ,P i,max ]P is then i ＝P i If P i ＞P i,max P is then i ＝P i,max If P i ＜P i,min P is then i ＝P i,min 。
Compared with the closest prior art, the application has the following beneficial effects:
according to the control method and the device for the photovoltaic power station participating in the power grid frequency adjustment, the active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in the power 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 power grid frequency adjustment and the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency adjustment; the adjusting speed and the adjusting precision of the photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency adjustment are improved, and the performance of the photovoltaic power station participating in the power grid frequency adjustment is further improved; the adjustment instruction value is corrected by utilizing the active power measured value of the grid connection point of the photovoltaic power station, so that the accuracy of the photovoltaic power generation units 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 of a photovoltaic power generation unit of the present application participating in grid frequency regulation;
fig. 2 is a schematic diagram of a control device of the photovoltaic power generation unit of the present application participating in grid frequency regulation.
Detailed Description
The following describes the embodiments of the present application in further detail with reference to the drawings.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The application provides a control method for a photovoltaic power station to participate in power grid frequency regulation, as shown in fig. 1, the method comprises the following steps:
step 1, determining an active power instruction value of a photovoltaic power generation unit in a photovoltaic power station participating in power grid frequency adjustment according to the frequency of a high-voltage side of a box-type transformer of the photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency adjustment and the grid-connected point frequency of the photovoltaic power station participating in power grid frequency adjustment;
and 2, carrying out active power adjustment on the corresponding photovoltaic power generation units according to the active power instruction values of the photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency adjustment.
In the above control method, step 1 determines an 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, and includes:
determining a first regulation reference 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;
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 an 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 first adjustment reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment and the second adjustment reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment.
Further, the determining the 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-type 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 an ith photovoltaic power generation unit in a photovoltaic power plant involved in grid frequency regulation as follows i,1 ：
P i,1 ＝P i,0 +ΔP i,1
In the formula, if P i,1 ∈[P i,min ,P i,max ]P is then i,1 ＝P i,1 If P i,1 ＞P i,max P is then i,1 ＝P i,max If P i,1 ＜P i,min P is then i,1 ＝P i,min ，P i,max Active power maximum value, P, of an ith photovoltaic power generation unit in a photovoltaic power station participating in grid frequency regulation i,min Active power minimum value, P, of ith photovoltaic power generation unit in photovoltaic power station participating in power grid frequency adjustment i,0 For the initial active power command value, ΔP, of the ith photovoltaic power generation unit in a photovoltaic power plant involved in grid frequency regulation i,1 And (3) the first adjustment quantity of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment, wherein i epsilon 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 adjustment does not exceed the preset dead zone, the participating power grid frequency adjustmentFirst regulating variable delta P of ith photovoltaic power generation unit in festival photovoltaic power plant i,1 =0; 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 formula i,1 ：
Wherein f i For 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, f L Is the lower limit value of the preset dead zone, f H To preset the upper limit value of the dead zone, P i array And k is an adjusting coefficient for rated capacity of an ith photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency adjustment.
Further, the determining the 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 an ith photovoltaic power generation unit in a photovoltaic power plant involved in grid frequency regulation as follows i,2 ：
Wherein P' 0 For the initial active power command value, P, of the photovoltaic power plant involved in the regulation of the grid frequency out For the grid-connected point active power measurement value delta P of the photovoltaic power station participating in the grid frequency adjustment 2 And n is the total number of photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency regulation, and delta is the active power dead zone of the photovoltaic power station participating in the power grid frequency regulation.
Further, if providedThe grid-connected point frequency of the photovoltaic power station participating in the grid frequency adjustment does not exceed a preset dead zone, and the adjustment quantity delta P of the photovoltaic power station participating in the grid frequency adjustment 2 =0; if the grid-connected point frequency of the photovoltaic power station participating in the grid frequency adjustment exceeds a preset dead zone, determining the adjustment quantity delta P of the photovoltaic power station participating in the grid frequency adjustment according to the following formula 2 ：
Wherein f is the grid-connected point frequency of the photovoltaic power station participating in the regulation of the grid frequency, and f L Is the lower limit value of the preset dead zone, f H For the upper limit value of the preset dead zone, k is the adjustment coefficient,for the rated capacity of photovoltaic power stations involved in the regulation of the grid frequency.
Further, the determining the active power instruction value of the photovoltaic power generation unit participating in the power grid frequency adjustment according to the first adjustment reference value of the photovoltaic power generation unit participating in the power grid frequency adjustment and the second adjustment reference value of the photovoltaic power generation unit participating in the power grid frequency adjustment includes:
determining an active power command value P of an ith photovoltaic power generation unit in a photovoltaic power station participating in power grid frequency adjustment according to the following formula i ：
P i ＝P i,1 +P i,2
In the formula, if P i ∈[P i,min ,P i,max ]P is then i ＝P i If P i ＞P i,max P is then i ＝P i,max If P i ＜P i,min P is then i ＝P i,min 。
The application also provides a control device for the photovoltaic power station to participate in the frequency regulation of the power grid, 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 adjustment 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 adjustment and the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency adjustment;
and the control unit is used for carrying out active power adjustment on the corresponding photovoltaic power generation units according to the active power instruction values of the photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency adjustment.
Preferably, the determining unit is specifically configured to:
determining a first regulation reference 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;
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 an 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 first adjustment reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment and the second adjustment reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment.
Further, the determining the 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-type 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 an ith photovoltaic power generation unit in a photovoltaic power plant involved in grid frequency regulation as follows i,1 ：
P i,1 ＝P i,0 +ΔP i,1
In the formula, if P i,1 ∈[P i,min ,P i,max ]P is then i,1 ＝P i,1 If P i,1 ＞P i,max P is then i,1 ＝P i,max If P i,1 ＜P i,min P is then i,1 ＝P i,min ，P i,max Active power maximum value, P, of an ith photovoltaic power generation unit in a photovoltaic power station participating in grid frequency regulation i,min Active power minimum value, P, of ith photovoltaic power generation unit in photovoltaic power station participating in power grid frequency adjustment i,0 For the initial active power command value, ΔP, of the ith photovoltaic power generation unit in a photovoltaic power plant involved in grid frequency regulation i,1 And (3) the first adjustment quantity of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment, wherein i epsilon 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 adjustment does not exceed the preset dead zone, the first adjustment quantity Δp of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment i,1 =0; 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 formula i,1 ：
Wherein f i For 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, f L Is the lower limit value of the preset dead zone, f H To preset the upper limit value of the dead zone, P i array And k is an adjusting coefficient for rated capacity of an ith photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency adjustment.
Further, the determining the 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 the ith in a photovoltaic power station involved in grid frequency regulation as followsSecond regulating reference value P of each photovoltaic power generation unit i,2 ：
Wherein P' 0 For the initial active power command value, P, of the photovoltaic power plant involved in the regulation of the grid frequency out For the grid-connected point active power measurement value delta P of the photovoltaic power station participating in the grid frequency adjustment 2 And n is the total number of photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency regulation, and delta is the 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 grid frequency adjustment does not exceed the preset dead zone, the adjustment quantity delta P of the photovoltaic power station participating in the grid frequency adjustment 2 =0; if the grid-connected point frequency of the photovoltaic power station participating in the grid frequency adjustment exceeds a preset dead zone, determining the adjustment quantity delta P of the photovoltaic power station participating in the grid frequency adjustment according to the following formula 2 ：
Wherein f is the grid-connected point frequency of the photovoltaic power station participating in the regulation of the grid frequency, and f L Is the lower limit value of the preset dead zone, f H For the upper limit value of the preset dead zone, k is the adjustment coefficient,for the rated capacity of photovoltaic power stations involved in the regulation of the grid frequency.
Further, the determining the active power instruction value of the photovoltaic power generation unit participating in the power grid frequency adjustment according to the first adjustment reference value of the photovoltaic power generation unit participating in the power grid frequency adjustment and the second adjustment reference value of the photovoltaic power generation unit participating in the power grid frequency adjustment includes:
determining an active power command value P of an ith photovoltaic power generation unit in a photovoltaic power station participating in power grid frequency adjustment according to the following formula i ：
P i ＝P i,1 +P i,2
In the formula, if P i ∈[P i,min ,P i,max ]P is then i ＝P i If P i ＞P i,max P is then i ＝P i,max If P i ＜P i,min P is then i ＝P i,min 。
In summary, according to the control method and the device for the photovoltaic power station participating in the power grid frequency adjustment, the active power instruction value of the photovoltaic power generation unit in the photovoltaic power station participating in the power 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 power grid frequency adjustment and the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency adjustment; the adjusting speed and the adjusting precision of the photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency adjustment are improved, and the performance of the photovoltaic power station participating in the power grid frequency adjustment is further improved; the adjustment instruction value is corrected by utilizing the active power measured value of the grid connection point of the photovoltaic power station, so that the accuracy of the photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency adjustment is improved.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 aspects of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the application without departing from the spirit and scope of the application, which is intended to be covered by the claims.
Claims (2)
1. A control method for a photovoltaic power plant to participate in grid frequency regulation, the method comprising:
determining an 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-type 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;
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, carrying out active power adjustment on the corresponding photovoltaic power generation unit;
the method for 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-type 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 comprises the following steps:
determining a first regulation reference 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;
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;
determining an 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 first adjustment reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment and the second adjustment reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment;
the first regulation reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation 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 power grid frequency regulation, and the first regulation reference value comprises:
determining a first regulation reference value P of an ith photovoltaic power generation unit in a photovoltaic power plant involved in grid frequency regulation as follows i,1 ：
P i,1 ＝P i,0 +ΔP i,1
In the formula, if P i,1 ∈[P i,min ,P i,max ]P is then i,1 ＝P i,1 If P i,1 ＞P i,max P is then i,1 ＝P i,max If P i,1 ＜P i,min P is then i,1 ＝P i,min ，P i,max Active power maximum value, P, of an ith photovoltaic power generation unit in a photovoltaic power station participating in grid frequency regulation i,min Active power minimum value, P, of ith photovoltaic power generation unit in photovoltaic power station participating in power grid frequency adjustment i,0 For the initial active power command value, ΔP, of the ith photovoltaic power generation unit in a photovoltaic power plant involved in grid frequency regulation i,1 The method comprises the steps that i epsilon n is the total number of photovoltaic power generation units in a photovoltaic power station participating in power grid frequency regulation, wherein i epsilon n is the first regulation quantity of the ith photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation;
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 does not exceed the preset dead zone, the first adjustment quantity delta P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment i,1 =0; 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 formula i,1 ：
Wherein f i For 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, f L Is the lower limit value of the preset dead zone, f H To preset the upper limit value of the dead zone, P i array The rated capacity of an ith photovoltaic power generation unit in a photovoltaic power station participating in power grid frequency regulation is calculated, and k is an adjustment coefficient;
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 comprises the following steps:
determining a second regulation reference value P of an ith photovoltaic power generation unit in a photovoltaic power plant involved in grid frequency regulation as follows i,2 ：
Wherein P is 0 ' is the initial active power command value, P, of the photovoltaic power plant involved in grid frequency regulation out For the grid-connected point active power measurement value delta P of the photovoltaic power station participating in the grid frequency adjustment 2 N is the total number of photovoltaic power generation units in the photovoltaic power stations participating in the power grid frequency adjustment, and delta is the active power dead zone of the photovoltaic power stations participating in the power grid frequency adjustment;
if the grid-connected point frequency of the photovoltaic power station participating in the grid frequency adjustment does not exceed the preset dead zone, the adjustment quantity delta P of the photovoltaic power station participating in the grid frequency adjustment 2 =0; if the grid-connected point frequency of the photovoltaic power station participating in the grid frequency adjustment exceeds a preset dead zone, determining the adjustment quantity delta P of the photovoltaic power station participating in the grid frequency adjustment according to the following formula 2 ：
Wherein f is the grid-connected point frequency of the photovoltaic power station participating in the regulation of the grid frequency, and f L Is the lower limit value of the preset dead zone, f H For the upper limit value of the preset dead zone, k is the adjustment coefficient,rated capacity of a photovoltaic power station for participating in grid frequency regulation;
the determining the active power instruction value of the photovoltaic power generation unit participating in the power grid frequency adjustment according to the first adjustment reference value of the photovoltaic power generation unit participating in the power grid frequency adjustment and the second adjustment reference value of the photovoltaic power generation unit participating in the power grid frequency adjustment comprises the following steps:
determining an active power command value P of an ith photovoltaic power generation unit in a photovoltaic power station participating in power grid frequency adjustment according to the following formula i ：
P i ＝P i,1 +P i,2
In the formula, if P i ∈[P i,min ,P i,max ]P is then i ＝P i If P i ＞P i,max P is then i ＝P i,max If P i ＜P i,min P is then i ＝P i,min 。
2. A control device for a photovoltaic power plant to participate in grid frequency regulation, the device 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 adjustment 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 adjustment and the grid-connected point frequency of the photovoltaic power station participating in the power grid frequency adjustment;
the control unit is used for carrying out active power adjustment on the corresponding photovoltaic power generation units according to the active power instruction values of the photovoltaic power generation units in the photovoltaic power station participating in the power grid frequency adjustment;
the determining unit is specifically configured to:
determining a first regulation reference 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;
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;
determining an 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 first adjustment reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment and the second adjustment reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment;
the first regulation reference value of the photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency regulation 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 power grid frequency regulation, and the first regulation reference value comprises:
determining a first regulation reference value P of an ith photovoltaic power generation unit in a photovoltaic power plant involved in grid frequency regulation as follows i,1 ：
P i,1 ＝P i,0 +ΔP i,1
In the formula, if P i,1 ∈[P i,min ,P i,max ]P is then i,1 ＝P i,1 If P i,1 ＞P i,max P is then i,1 ＝P i,max If P i,1 ＜P i,min P is then i,1 ＝P i,min ，P i,max Active power maximum value, P, of an ith photovoltaic power generation unit in a photovoltaic power station participating in grid frequency regulation i,min Active power minimum value, P, of ith photovoltaic power generation unit in photovoltaic power station participating in power grid frequency adjustment i,0 For the initial active power command value, ΔP, of the ith photovoltaic power generation unit in a photovoltaic power plant involved in grid frequency regulation i,1 The method comprises the steps that i epsilon n is the total number of photovoltaic power generation units in a photovoltaic power station participating in power grid frequency regulation, wherein i epsilon n is the first regulation quantity of the ith photovoltaic power generation unit in the photovoltaic power station participating in power grid frequency regulation;
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 does not exceed the preset dead zone, the first adjustment quantity delta P of the ith photovoltaic power generation unit in the photovoltaic power station participating in the power grid frequency adjustment i,1 =0; 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 formula i,1 ：
Wherein f i For 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, f L Is the lower limit value of the preset dead zone, f H To preset the upper limit value of the dead zone, P i array The rated capacity of an ith photovoltaic power generation unit in a photovoltaic power station participating in power grid frequency regulation is calculated, and k is an adjustment coefficient;
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 comprises the following steps:
determining a second regulation reference value P of an ith photovoltaic power generation unit in a photovoltaic power plant involved in grid frequency regulation as follows i,2 ：
Wherein P is 0 ' is the initial active power command value, P, of the photovoltaic power plant involved in grid frequency regulation out For the grid-connected point active power measurement value delta P of the photovoltaic power station participating in the grid frequency adjustment 2 N is the total number of photovoltaic power generation units in the photovoltaic power stations participating in the power grid frequency adjustment, and delta is the active power dead zone of the photovoltaic power stations participating in the power grid frequency adjustment;
if the grid-connected point frequency of the photovoltaic power station participating in the grid frequency adjustment does not exceed the preset dead zone, the adjustment quantity delta P of the photovoltaic power station participating in the grid frequency adjustment 2 =0; if the grid-connected point frequency of the photovoltaic power station participating in the grid frequency adjustment exceeds a preset dead zone, determining the adjustment quantity delta P of the photovoltaic power station participating in the grid frequency adjustment according to the following formula 2 ：
Wherein f is the grid-connected point frequency of the photovoltaic power station participating in the regulation of the grid frequency, and f L Is the lower limit value of the preset dead zone, f H For the upper limit value of the preset dead zone, k is the adjustment coefficient,rated capacity of a photovoltaic power station for participating in grid frequency regulation;
the determining the active power instruction value of the photovoltaic power generation unit participating in the power grid frequency adjustment according to the first adjustment reference value of the photovoltaic power generation unit participating in the power grid frequency adjustment and the second adjustment reference value of the photovoltaic power generation unit participating in the power grid frequency adjustment comprises the following steps:
determining an active power command value P of an ith photovoltaic power generation unit in a photovoltaic power station participating in power grid frequency adjustment according to the following formula i ：
P i ＝P i,1 +P i,2
In the formula, if P i ∈[P i,min ,P i,max ]P is then i ＝P i If P i ＞P i,max P is then i ＝P i,max If P i ＜P i,min P is then i ＝P i,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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