CN113394830B - Reactive power regulation and control method and device for photovoltaic power station, terminal and storage medium - Google Patents
Reactive power regulation and control method and device for photovoltaic power station, terminal and storage medium Download PDFInfo
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- H—ELECTRICITY
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- 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
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The reactive power regulation and control method of the photovoltaic power station comprises the steps of obtaining reactive power to be regulated, distributing the reactive power to each inverter execution unit according to a box transformer-inverter group mode, considering characteristics and system stability of different devices in the distribution process, and adding stable operation constraint, so that surplus reactive capacity in the inverters is dispatched to the maximum extent to achieve reactive power compensation, and the technical problems that regulation, operation and maintenance cost is increased and benefit is reduced due to the fact that the existing reactive power regulation and control of photovoltaic power generation equipment depends on the fact that reactive power compensation devices are additionally installed are solved.
Description
Technical Field
The application relates to the technical field of photovoltaic power generation, in particular to a reactive power regulation and control method, device, terminal and storage medium for a photovoltaic power station.
Background
The photovoltaic power generation is one of the most mature and promising renewable energy sources at present, the photovoltaic power generation keeps a strong development trend in recent years, particularly, in recent years, with the strategic promotion of 'carbon peak reaching and carbon neutralization', the development of a photovoltaic power station will meet an outbreak period, but with the increase of the number and capacity of power stations, the photovoltaic power generation with remarkable random characteristics will impact a power distribution network, and the power factor of a distributed photovoltaic power station is poor, so that a hidden danger is easily brought to the stable operation of a whole power system.
At present, the method for improving the reactive power regulation and control capability of photovoltaic power generation mainly comprises the step of additionally arranging a reactive power compensation device for a photovoltaic power station with a large capacity and severe power consumption in a plant area so as to ensure the system stability and the power grid requirement in the station and stabilize the operation environment of a power system, but the method can greatly increase the investment and operation and maintenance cost and reduce the economic benefit.
Disclosure of Invention
The application provides a reactive power regulation and control method, device, terminal and storage medium for a photovoltaic power station, and is used for solving the technical problems that regulation and control operation and maintenance cost is increased and benefit is reduced due to the fact that the existing reactive power regulation and control of photovoltaic power generation equipment depends on the installation of a reactive power compensation device.
The application provides a reactive power regulation and control method for a photovoltaic power station in a first aspect, which comprises the following steps:
acquiring the reactive power to be adjusted of the photovoltaic power station to be adjusted and controlled;
according to the reactive power amount to be adjusted and the power constraint condition of the box transformer equipment in the photovoltaic power station, calculating to obtain a first reactive power adjustment amount of the box transformer equipment to be obtained by combining a first reactive power adjustment amount distribution strategy, wherein the first reactive power adjustment amount is a reactive power adjustment amount share distributed by the box transformer equipment from the reactive power amount to be adjusted, and the accumulated sum of the first reactive power adjustment amount is not greater than the reactive power amount to be adjusted;
and calculating to obtain a second reactive power adjustment quantity of each inverter according to the first reactive power adjustment quantity and the power constraint condition of each inverter in the box-type substation equipment and by combining a second reactive power adjustment quantity distribution strategy, so as to perform reactive power regulation on the inverters according to the second reactive power adjustment quantity corresponding to each inverter, wherein the second reactive power adjustment quantity is a reactive power adjustment quantity share distributed by the inverters from the first reactive power adjustment quantity.
Preferably, the calculating, according to the reactive power amount to be adjusted and the power constraint condition of the box transformer equipment in the photovoltaic power station and in combination with a reactive power adjustment amount distribution strategy, to obtain the first reactive power adjustment amount of the box transformer equipment to be solved specifically includes:
and calculating to obtain a first reactive adjustment quantity of each box transformer substation device to be solved according to the reactive adjustment quantity to be adjusted and the power constraint condition of each box transformer substation device in the photovoltaic power station and by combining a reactive adjustment quantity distribution strategy.
Preferably, after the calculating the second reactive power adjustment amount of each of the inverters, the method further includes:
and correcting the first reactive adjustment quantity of the box transformer substation equipment to be obtained according to the accumulated sum of the second reactive adjustment quantities of all inverters in the box transformer substation equipment, so as to calculate or correct the first reactive adjustment quantity of the remaining box transformer substation equipment according to the reactive adjustment quantity to be adjusted and the corrected first reactive adjustment quantity.
Preferably, the calculation order of the first reactive adjustment amount is the order from the box-type substation equipment closest to the grid-connected point to the box-type substation equipment farthest from the grid-connected point.
Preferably, the obtaining of the reactive power to be adjusted of the photovoltaic power station to be regulated further includes:
and when the reactive power to be adjusted exceeds the adjustable capacity of the photovoltaic power station, correcting the reactive power to be adjusted according to the adjustable capacity.
Preferably, the process of calculating the first reactive adjustment amount by the first reactive adjustment amount allocation policy specifically includes:
calculating an average power angle parameter and an average apparent power parameter of a box transformer substation equipment group according to the box transformer substation equipment group under the photovoltaic power station, wherein the box transformer substation equipment group is an equipment group consisting of box transformer substation equipment which is not distributed with a first reactive adjustment amount in the photovoltaic power station;
according to the average power angle parameter of the box transformer substation equipment group, combining with the calculation of a power angle reactive power optimization formula, obtaining a third reactive power adjustment quantity of the box transformer substation equipment to be solved, wherein the power angle reactive power optimization formula specifically comprises:
in the formula, Q opti_1 For said third reactive adjustment, Q 1 For the reactive power parameter, P, of the box-type substation equipment to be solved 1 For the active power parameter of the box transformer equipment to be solved,
is the average power angle parameter of the box transformer substation equipment group, m is the number of the box transformer substation equipment in the box transformer substation equipment group, Q i Is a reactive power parameter, P, of the ith box-to-box equipment i Active power parameter, Q, for the ith box-to-substation equipment sur The residual adjustment quantity which is not distributed in the reactive quantity to be adjusted is obtained;
according to the average apparent power parameter of the box transformer equipment group
And calculating an apparent power reactive power optimization formula to obtain a fourth reactive power adjustment quantity of the box transformer substation equipment to be solved, wherein the apparent power reactive power optimization formula specifically comprises the following steps:
in the formula, Q opti_2 For the fourth reactive power adjustment amount is,
an average apparent power parameter for the group of box transformer equipment; q i A reactive power parameter, P, for the ith substation equipment i Is an active power parameter, Q, of the ith box transformer equipment sur For the remaining unallocated adjustment quantity, Q, in the reactive quantity to be adjusted 1 Is the reactive power parameter, P, of the first box-type substation equipment in the box-type substation equipment group 1 The active power parameter of the first box transformer substation equipment in the box transformer substation equipment group is obtained;
according to the average value of the third reactive power adjustment quantity and the fourth reactive power adjustment quantity, the average value is corrected by combining the reactive power quantity to be adjusted and the power constraint condition of the box transformer substation equipment in the photovoltaic power station, so as to obtain a first reactive power adjustment quantity of the box transformer substation equipment to be obtained, wherein the power constraint condition of the box transformer substation equipment in the photovoltaic power station specifically includes: the capacity constraint of the box transformer substation equipment and the voltage constraint of the box transformer substation equipment.
Preferably, the process of calculating the second reactive power adjustment amount by the second reactive power adjustment amount distribution strategy specifically includes:
calculating an average power angle parameter and an average apparent power parameter of the inverter group according to the inverter group under the box transformer substation equipment, wherein the inverter group is an equipment group consisting of inverters which are not distributed with second reactive power adjustment amount in the box transformer substation equipment;
according to the average power angle parameter of the inverter group, combining with the calculation of a power angle reactive power optimization formula, obtaining a fifth reactive power adjustment quantity of the inverter to be obtained, wherein the power angle reactive power optimization formula specifically comprises:
in the formula, Q 1 opti_1 For the fifth reactive power adjustment, Q ij Is the reactive power parameter, P, of the jth inverter of the ith box-type substation equipment ij For the ith box-type substation equipmentThe active power parameters of each of the inverters are,
is an average power angle parameter for the group of inverters, n is a number of inverters in the group of inverters,
the unallocated remaining adjustment quantity, Q, in the first reactive adjustment quantity of the ith box transformer equipment i1 For the reactive power parameter, P, of the inverter to be found i1 The active power parameter of the inverter to be solved is obtained;
according to the average apparent power parameter of the inverter group, calculating by combining an apparent power reactive power optimization formula to obtain a sixth reactive power adjustment quantity of the inverter to be solved, wherein the apparent power reactive power optimization formula specifically comprises:
in the formula (I), the compound is shown in the specification,
for the sixth reactive power adjustment amount,
is an average apparent power parameter, Q, of the inverter group ij Is the reactive power parameter, P, of the jth inverter of the ith box-type substation equipment ij The active power parameter, Q, of the jth inverter of the ith box transformer equipment i1 For the reactive power parameter, P, of the inverter to be found i1 Is an active power parameter of the inverter to be solved, n is the number of inverters in the inverter group,
the remaining unallocated adjustment amount in the first reactive adjustment amount of the ith box transformer substation equipment;
according to the average value of the fifth reactive power adjustment quantity and the sixth reactive power adjustment quantity, the average value is corrected by combining the first reactive power adjustment quantity and power constraint conditions of each inverter in the box-type substation equipment to obtain a second reactive power adjustment quantity of the inverter, wherein the power constraint conditions of the inverters in the photovoltaic power station specifically include: an inverter capacity constraint, an inverter voltage constraint, and an inverter reactive quota constraint.
This application second aspect provides a reactive regulation and control device of photovoltaic power plant, includes:
the device comprises a to-be-adjusted reactive power obtaining unit, a to-be-adjusted reactive power obtaining unit and a to-be-adjusted reactive power obtaining unit, wherein the to-be-adjusted reactive power obtaining unit is used for obtaining the to-be-adjusted reactive power of the to-be-adjusted photovoltaic power station;
a first reactive adjustment amount calculation unit, configured to calculate, according to the reactive amount to be adjusted and a power constraint condition of a box transformer device in the photovoltaic power station, and in combination with a first reactive adjustment amount distribution policy, a first reactive adjustment amount of the box transformer device to be obtained, where the first reactive adjustment amount is a reactive adjustment amount share distributed by the box transformer device from the reactive amount to be adjusted, and an accumulated sum of the first reactive adjustment amounts is not greater than the reactive amount to be adjusted;
and the inverter regulation and control unit is used for calculating and obtaining a second reactive power regulation quantity of each inverter according to the first reactive power regulation quantity and the power constraint condition of each inverter in the box transformer substation equipment and by combining a second reactive power regulation quantity distribution strategy so as to perform reactive power regulation and control on the inverters according to the second reactive power regulation quantity corresponding to each inverter, wherein the second reactive power regulation quantity is a reactive power regulation quantity share distributed by the inverters from the first reactive power regulation quantity.
The third aspect of the present application provides a reactive regulation and control terminal of photovoltaic power plant, including: a memory and a processor;
the memory is used for storing program codes, and the program codes correspond to a photovoltaic power station reactive power regulation method provided by the first aspect of the application;
the processor is configured to execute the program code.
A fourth aspect of the present application provides a computer-readable storage medium having stored therein program code corresponding to a method for reactive power regulation of a photovoltaic power plant as provided in the first aspect of the present application.
According to the technical scheme, the method has the following advantages:
according to the reactive power regulation and control method for the photovoltaic power station, after reactive power to be regulated is obtained, the reactive power is distributed to each inverter execution unit in a box transformer-inverter group mode, characteristics and system stability of different devices are considered in the distribution process, and stable operation constraint is added, so that surplus reactive capacity in the inverters is dispatched to the maximum extent to achieve reactive power compensation, and the technical problems that regulation and control operation cost is increased and benefit is reduced due to the fact that the existing reactive power regulation and control of photovoltaic power generation equipment depends on the reactive power compensation device are solved.
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In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic diagram of a feeder topology of a photovoltaic power plant.
Fig. 2 is a reactive power regulation and control distribution execution logic diagram of the reactive power regulation and control method for the photovoltaic power station provided by the present application.
Fig. 3 is a schematic flow chart of an embodiment of a reactive power regulation and control method for a photovoltaic power station provided by the present application.
Fig. 4 is a schematic flow chart of a reactive power regulation method for a photovoltaic power station according to a second embodiment of the present disclosure.
Fig. 5 is a schematic structural diagram of an embodiment of a reactive power regulation and control device for a photovoltaic power station provided by the present application.
Fig. 6 is a logic diagram of capacity constraint of a box-type substation device/inverter in the reactive power regulation method for a photovoltaic power station provided by the present application.
Fig. 7 is a box transformer equipment/inverter voltage constraint logic diagram in the reactive power regulation method for the photovoltaic power station provided by the present application.
Detailed Description
At present, the method for improving the reactive power regulation and control capability of photovoltaic power generation mainly comprises the step of additionally arranging a reactive power compensation device for a photovoltaic power station with a large capacity and severe power consumption in a plant area so as to ensure the system stability and the power grid requirement in the station and stabilize the operation environment of a power system, but the method can greatly increase the investment and operation and maintenance cost and reduce the economic benefit.
The applicant finds in research that most inverters in the current power grid system have 1.1 times of over-distribution capacity, have the advantages of fast response of power electronic devices, strong power voltage regulation capacity and the like, particularly have sufficient reactive capacity, and can achieve the effect of stabilizing voltage power balance in a station if the regulation and control capacity of an inverter group can be fully released.
Taking the feeder topology structure of the photovoltaic power station shown in fig. 1 as an example, the photovoltaic power station and the factory power plant share a bus, and are checked through a gateway table. The power consumption of a factory is difficult to regulate and control due to economic benefit, meanwhile, the traditional distributed photovoltaic power station generally outputs pure work for benefit maximization, but the photovoltaic power station still has enough residual capacity most of the time, and a power generation meter cannot be checked. Therefore, the reactive capacity required by the factory load can be compensated by carrying out reactive regulation on the residual capacity of the photovoltaic power station, so that the overall electricity utilization effect of an owner is optimized, the benefit is not lost, and even the power factor reward of a power grid is obtained.
Based on the above background conditions, the embodiment of the application provides a photovoltaic power station reactive power regulation method, device, terminal and storage medium, and is used for solving the technical problems that the regulation, operation and maintenance cost is increased and the benefit is reduced due to the fact that the existing photovoltaic power generation equipment reactive power regulation depends on the reactive power compensation device.
In order to make the objects, features and advantages of the present invention more apparent and understandable, the following embodiments of the present invention are clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the 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 application.
Referring to fig. 2 and fig. 3, a first embodiment of the present application provides a method for reactive power regulation of a photovoltaic power station, including:
It should be noted that, according to the method provided by the present application, the reactive power to be adjusted of the power station is obtained according to the photovoltaic power station to be adjusted, where the reactive power to be adjusted may be a required value for optimizing the total power factor of the photovoltaic power station and the power plant, or may be a compensation value for only optimizing the line loss inside the photovoltaic power station, or may be an external requirement such as a voltage reactive requirement of a grid-connected point, a requirement for a grid support capability, a grid scheduling command, and the like, and in short, is a specific reactive power value obtained by conversion according to the internal or external requirement of the photovoltaic power station.
102, calculating to obtain a first reactive adjustment quantity of the box transformer substation equipment to be obtained according to the reactive adjustment quantity to be adjusted and the power constraint condition of the box transformer substation equipment in the photovoltaic power station and by combining a first reactive adjustment quantity distribution strategy.
The first reactive adjustment quantity is a reactive adjustment quantity share distributed by the box transformer equipment from the reactive adjustment quantity to be adjusted, and the accumulated sum of the first reactive adjustment quantity is not greater than the reactive adjustment quantity to be adjusted.
It should be noted that, in step 102 of this embodiment, the first reactive adjustment amount allocation policy is specifically that when determining the reactive amount Q to be adjusted opti Determining the distribution execution amount of the first box transformer equipment after the distribution, constraint and optimization correction of the first distribution box transformer
Namely, the first reactive adjustment quantity of the first box-type substation equipment is distributed according to the reactive adjustment quantity when the subsequent feeder box-type substation equipment is distributed
And (4) calculating. And according to the following formula rule, the reactive power distribution quantity of the previously optimized box transformer substation is brought into the next optimized box transformer substation to correct the reactive power adjustment quantity of the box transformer substation.
In the formula, i represents the serial number of the box-type substation equipment.
And 103, calculating to obtain a second reactive power adjustment quantity of each inverter according to the first reactive power adjustment quantity and the power constraint condition of each inverter in the box-type substation equipment and by combining a second reactive power adjustment quantity distribution strategy, so as to perform reactive power regulation on the inverters according to the second reactive power adjustment quantity corresponding to each inverter.
The second reactive power adjustment amount is a reactive power adjustment amount share distributed by the inverter from the first reactive power adjustment amount, and generally, the accumulated sum of the second reactive power adjustment amounts is not greater than the first reactive power adjustment amount.
It should be noted that, in the second reactive power adjustment amount allocation strategy mentioned in step 103 of this embodiment, the allocation amount Q of the box transformer substation is similar to the first reactive power adjustment amount allocation strategy described above i The voltage is brought into an inverter group under the voltage, and a reactive power optimization value of each single inverter is obtained through distribution and constraint and is also a final reactive power execution value Q of a power generation grid node of the photovoltaic power station i1 . Will Q i1 The reactive power distribution carried into the next inverter group is corrected to be total distribution quantity Q i -Q i1 And confirming the reactive power execution value of the next inverter unit according to the same logic, and so on. The reactive adjustment correction equation of the inverter group is as follows:
in the formula, j represents the serial number of the inverter in the box-type substation equipment i.
And then, carrying out reactive power regulation and control on the inverters according to the second reactive power regulation amount corresponding to each inverter, thereby scheduling the surplus reactive power capacity in each inverter to the maximum extent so as to realize reactive power compensation.
The above content is a detailed description of a first embodiment of the reactive power regulation and control method for the photovoltaic power station provided by the present application, and the following content is a detailed description of a reactive power regulation and control method for the photovoltaic power station further provided by the present application on the basis of the content of the first embodiment.
Referring to fig. 4, based on the content of the first embodiment, a second embodiment of the present application provides a reactive power regulation method for a photovoltaic power station, including:
more specifically, in step 102, the step of calculating, according to the reactive power amount to be adjusted and the power constraint condition of the box transformer substation equipment in the photovoltaic power station, and in combination with the reactive power adjustment amount distribution strategy, to obtain the first reactive power adjustment amount of the box transformer substation equipment specifically includes:
and calculating to obtain a first reactive adjustment quantity of each box transformer substation device according to the reactive quantity to be adjusted and the power constraint condition of each box transformer substation device in the photovoltaic power station by combining a reactive adjustment quantity distribution strategy.
It should be noted that, when calculating the first reactive power adjustment amount and the second reactive power adjustment amount, according to the refinement steps, the first reactive power adjustment amount calculation of each box-type substation device and then the second reactive power adjustment amount calculation of each inverter therebelow may be completed in a unified manner, and of course, the first reactive power adjustment amount calculation and the second reactive power adjustment amount calculation of one box-type substation device and each inverter therebelow may also be completed first, and then the adjustment amount calculation of the next box-type substation device and its inverter may be completed.
More specifically, after calculating the second reactive power adjustment amount of each inverter, the method further includes:
and correcting the first reactive power adjustment amount of the box-type substation equipment according to the accumulated sum of the second reactive power adjustment amounts of all inverters in the box-type substation equipment, so as to calculate or correct the first reactive power adjustment amount of the remaining box-type substation equipment according to the reactive power amount to be adjusted and the corrected first reactive power adjustment amount.
Finally, after the complete optimization of the inverter group (n in total) under the box transformer substation is finished, the first reactive adjustment quantity of the box transformer substation equipment can be corrected according to the sum of the second reactive adjustment quantities of the inverters in the box transformer substation equipment, as follows:
taking the reactive power of the box transformer substation after the correction of the inverter group as a final execution quantity, and substituting the final execution quantity into an optimization formula 1 of the box transformer substation for calculation
More specifically, the first reactive adjustment amount is calculated in the order from the box-type substation closest to the grid-connected point to the box-type substation farthest from the grid-connected point.
It should be noted that, because the capacity of the distributed photovoltaic station is small, the high-voltage collection line is short, and the line loss is generally small. And determining reactive power optimization quantity in the station, and distributing execution quantity to the box transformer substation and the inverter according to distribution logic shown in the figure 5, wherein the distribution sequence of the box transformer substation is a grid-connected sequence. As shown in fig. 1, the box transformer substations are sequentially connected to the bus, and are output to the power grid or the plant area by the aid of the grid-connected device through continuous collection of the box transformer substations, and energy flows unidirectionally, so that box transformer substation equipment closer to a grid-connected point is preferentially distributed according to a grid-connected sequence during reactive power distribution, and reactive power execution and response effects are better, so that the overall compensation effect is ensured.
As can be seen from fig. 2, after the reactive power optimization value of the box-type substation to be distributed is confirmed according to the distribution logic, the reactive power distribution is performed on the inverter group connected below the box-type substation, and the distribution logic is the same as that of the box-type substation. As shown in fig. 1, in the topology of the newly-built photovoltaic power station, the inverter is directly connected to the low-voltage side of the box transformer through a transmission line, and since no confluence is required between capacity increases, no sequence requirement is required during optimization of the inverter group.
More specifically, step 101 is followed by:
and step 100, when the reactive power to be adjusted exceeds the adjustable capacity of the photovoltaic power station, correcting the reactive power to be adjusted according to the adjustable capacity.
More specifically, the process of calculating the first reactive adjustment amount by the first reactive adjustment amount allocation policy mentioned in step 102 specifically includes:
calculating an average power angle parameter and an average apparent power parameter of a box transformer substation equipment group according to the box transformer substation equipment group under the photovoltaic power station, wherein the box transformer substation equipment group is an equipment group consisting of box transformer substation equipment which is not distributed with a first reactive adjustment amount in the photovoltaic power station;
according to the average power angle parameter of the box transformer substation equipment group, combining the calculation of a power angle reactive power optimization formula to obtain a third reactive power adjustment quantity, wherein the power angle reactive power optimization formula specifically comprises the following steps:
in the formula, Q opti_1 For a third reactive power adjustment quantity, Q, of the box-type substation equipment to be solved 1 For the reactive power parameter, P, of the equipment of the tank-type substation to be solved 1 The active power parameter of the box transformer substation equipment to be solved is the active power parameter of the box transformer substation equipment to be solved, wherein the box transformer substation equipment to be solved is generally the first box transformer substation equipment in the box transformer substation equipment group,
the average power angle parameter of the box transformer substation equipment group is obtained by calculating the power parameter of each box transformer substation equipment under the photovoltaic power station, and specifically, the calculation formula of the average power angle parameter is as follows:
wherein m is the number of box-type substation equipment in the box-type substation equipment group, Q i Is a reactive power parameter, P, of the ith box-to-box equipment i Is an active power parameter, Q, of the ith box transformer equipment sur For the photovoltaic power station to be regulatedThe remaining adjustment amount that is not allocated in the reactive amount to be adjusted, that is, the difference between the reactive amount to be adjusted and the cumulative sum of the first reactive adjustment amounts of each box-type substation device to which the adjustment amount has been allocated.
Average apparent power parameter according to box transformer equipment group
And calculating by combining an apparent power reactive power optimization formula to obtain a fourth reactive power adjustment quantity, wherein the apparent power reactive power optimization formula specifically comprises:
in the formula, Q opti_2 For the fourth reactive power adjustment quantity of the box-type substation equipment to be obtained,
for the average apparent power parameter, Q, in a photovoltaic power plant 1 For the reactive power parameter, P, of the equipment of the tank-to-be-determined plant 1 The active power parameter of the box transformer substation equipment to be solved is obtained by calculating the power parameter of each box transformer substation equipment under the photovoltaic power station, and the specific calculation formula is as follows:
wherein m is the number of box-type substation equipment in the box-type substation equipment group, Q i Is a reactive power parameter, P, of the ith box-to-box equipment i Is an active power parameter, Q, of the ith box transformer equipment sur The residual adjustment amount which is not distributed in the reactive amount to be adjusted of the photovoltaic power station to be adjusted is obtained.
And correcting the average value according to the average value of the third reactive adjustment quantity and the fourth reactive adjustment quantity and by combining the reactive quantity to be adjusted and the power constraint condition of the box transformer substation equipment in the photovoltaic power station to obtain a first reactive adjustment quantity of the box transformer substation equipment, wherein the power constraint condition of the box transformer substation equipment in the photovoltaic power station specifically comprises: the capacity constraint of the box transformer substation equipment and the voltage constraint of the box transformer substation equipment.
More specifically, the step 103 of calculating the second reactive power adjustment amount by using the second reactive power adjustment amount distribution strategy specifically includes:
calculating an average power angle parameter and an average apparent power parameter of the inverter group according to the inverter group under the box transformer substation equipment, wherein the inverter group is an equipment group consisting of inverters which are not distributed with second reactive power adjustment quantity in the box transformer substation equipment;
according to the average power angle parameter of the inverter group, a fifth reactive power adjustment quantity is obtained by combining the calculation of a power angle reactive power optimization formula, wherein the power angle reactive power optimization formula specifically comprises the following steps:
in the formula, Q 1 opti_1 For a fifth reactive adjustment of the inverter to be solved, Q i1 For the reactive power parameter of the inverter to be solved, P i1 Is the active power parameter of the inverter to be sought, which is typically the first inverter in the inverter group,
the specific calculation formula is the average power angle parameter of the inverter group:
wherein i is the number of box transformer equipment, n is the number of inverters in the ith box transformer equipment, and P ij Is the active power, Q, of the jth inverter in the ith box transformer equipment ij For the reactive power of the jth inverter in the ith box-type substation,
the residual adjustment quantity which is not distributed in the first reactive adjustment quantity of the ith box-type substation equipment, namely the first reactive adjustment of the box-type substation equipmentAnd the integral quantity and the second reactive power adjustment quantity of each inverter distributed with the adjustment quantity are added up to be summed.
According to the average apparent power parameter of the box transformer substation equipment, calculating by combining an apparent power reactive power optimization formula to obtain a sixth reactive power adjustment quantity, wherein the apparent power reactive power optimization formula specifically comprises:
in the formula (I), the compound is shown in the specification,
for a sixth reactive adjustment of the inverter to be achieved, Q i1 For the reactive power parameter of the inverter to be solved, P i1 As the active power parameter of the inverter to be sought,
specifically, the power parameters of each inverter under the box-type substation equipment are calculated to obtain a specific calculation formula as follows:
where n is the number of inverters in the inverter group, P ij Is the active power, Q, of the jth inverter in the ith box transformer equipment ij For the reactive power of the jth inverter in the ith box-type substation,
the remaining adjustment amount which is not distributed in the first reactive adjustment amount of the ith box-type substation equipment.
According to the average value of the fifth reactive power adjustment quantity and the sixth reactive power adjustment quantity, the average value is corrected by combining the first reactive power adjustment quantity and the power constraint conditions of all inverters in the box type transformer substation equipment to obtain a second reactive power adjustment quantity of the box type transformer substation equipment, and the power constraint conditions of the box type transformer substation equipment in the photovoltaic power station specifically include: an inverter capacity constraint, an inverter voltage constraint, and an inverter reactive limit constraint.
It should be noted that, in the present embodiment, the constraint condition may be used to check whether the reactive allocation amount is correct, and the allocation amount needs to be corrected beyond the requirement.
From fig. 2, the constraints include an overall capacity constraint, a box-to-box voltage constraint, an inverter capacity constraint, an inverter voltage constraint and an inverter reactive power limitation constraint. Wherein the principle of the capacity constraints of the box-type substation equipment and the inverter are the same, and wherein the reactive power optimization values of the different devices are adaptively modified
The capacity constraint determination processing logic is shown in fig. 6.
The box transformer equipment is taken as an explanation object, and the judgment is shown as follows:
the correction formula is as follows:
the box transformer and the inverter have voltage constraint with the same principle, and the voltage constraint is used for preventing the phenomena of equipment damage, loss increase, system unbalance and the like caused by the fact that the working voltage of a device exceeds a required range due to reactive power adjustment. The voltage constraint enforcement logic is shown in fig. 7, and the real-time voltage and rated voltage of each device are required as criteria when enforcing the voltage constraint on each device.
For the over-voltage phenomenon due to the capacitive reactive in fig. 7, the assigned value is corrected using the following formula.
And correcting the distribution value by adopting the following formula due to the low-voltage phenomenon caused by inductive reactive power.
The power angle approximation principle is adopted in the correction process, namely, the voltage of the device changes due to the size and the phase of the current in the reactive power adjusting process, and the voltage and the current are approximately considered to be unchanged relative to the phase in the changing process.
In addition, regarding the inverter reactive power limit constraint which is more specific among the above constraint conditions, it can be seen from fig. 2 that the inverter reactive power limit constraint is taken, since the inverter is required to be adjustable under the rated power and the inverter is required to have the capability of continuously running with the capacity of 1.1 times more than the rated power, therefore, there are:
when the reactive power distribution of the inverter is more than 0.48 multiplied by S Rated value Sometimes, there is a possibility that the active power output will be affected, and therefore a limit is required.
Referring to fig. 5, a third embodiment of the present application provides a reactive power regulation device for a photovoltaic power station, including:
a to-be-adjusted reactive power obtaining unit 201, configured to obtain a to-be-adjusted reactive power of a to-be-adjusted photovoltaic power station;
the first reactive adjustment amount calculation unit 202 is configured to calculate, according to the reactive amount to be adjusted and the power constraint condition of the box transformer substation equipment in the photovoltaic power station, and in combination with a first reactive adjustment amount distribution strategy, to obtain a first reactive adjustment amount of the box transformer substation equipment, where the first reactive adjustment amount is a reactive adjustment amount share distributed by the box transformer substation equipment from the reactive amount to be adjusted, and an accumulated sum of the first reactive adjustment amount is not greater than the reactive amount to be adjusted;
and the inverter regulation and control unit 203 is configured to calculate, according to the first reactive adjustment amount and the power constraint condition of each inverter in the box-type substation equipment, and in combination with a second reactive adjustment amount distribution strategy, a second reactive adjustment amount of each inverter so as to perform reactive regulation on the inverters according to the second reactive adjustment amount corresponding to each inverter, where the second reactive adjustment amount is a reactive adjustment amount share distributed by the inverters from the first reactive adjustment amount.
In addition, the application also provides a description of an embodiment of the photovoltaic power station reactive power regulation terminal and an embodiment of a computer readable storage medium.
The fourth embodiment of this application provides a reactive regulation and control terminal of photovoltaic power plant, includes: a memory and a processor;
the memory is used for storing program codes, and the program codes correspond to the photovoltaic power station reactive power regulation method provided by the first embodiment or the second embodiment of the application;
the processor is used for executing the program codes to realize the reactive power regulation and control method of the photovoltaic power station provided by the first embodiment or the second embodiment of the application.
A fifth embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores program codes corresponding to a method for reactive power regulation of a photovoltaic power plant as provided in the first embodiment or the second embodiment of the present application.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the terminal, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed terminal, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention, which is substantially or partly contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (9)
1. A reactive power regulation and control method for a photovoltaic power station is characterized by comprising the following steps:
acquiring the reactive power to be adjusted of the photovoltaic power station to be adjusted and controlled;
calculating an average power angle parameter and an average apparent power parameter of a box transformer substation equipment group according to the box transformer substation equipment group under the photovoltaic power station, wherein the box transformer substation equipment group is an equipment group consisting of box transformer substation equipment which is not distributed with a first reactive adjustment amount in the photovoltaic power station;
according to the average power angle parameter of the box transformer substation equipment group, combining with the calculation of a power angle reactive power optimization formula, obtaining a third reactive power adjustment quantity of the box transformer substation equipment to be solved, wherein the power angle reactive power optimization formula specifically comprises:
in the formula, Q opti_1 For said third reactive adjustment, Q 1 For the reactive power parameter, P, of the box-type substation equipment to be solved 1 For the active power parameter of the box transformer equipment to be solved,
is the average power angle parameter of the box transformer substation equipment group, m is the number of the box transformer substation equipment in the box transformer substation equipment group, Q i Is a reactive power parameter, P, of the ith box-to-box equipment i Is an active power parameter, Q, of the ith box transformer equipment sur The residual adjustment quantity which is not distributed in the reactive quantity to be adjusted is obtained;
according to the average apparent power parameter of the box transformer equipment group
And calculating an apparent power reactive power optimization formula to obtain a fourth reactive power adjustment quantity of the box transformer substation equipment to be solved, wherein the apparent power reactive power optimization formula specifically comprises the following steps:
in the formula, Q opti_2 For the fourth reactive power adjustment amount is,
an average apparent power parameter for the group of box transformer equipment; q i Is a reactive power parameter, P, of the ith box-to-box equipment i For the active power parameter of the ith box transformer equipment,Q 1 for the reactive power parameter, P, of the box-type substation equipment to be solved 1 For the active power parameter, Q, of the box-to-substation equipment to be solved sur The residual adjustment quantity which is not distributed in the reactive quantity to be adjusted is obtained;
according to the average value of the third reactive power adjustment amount and the fourth reactive power adjustment amount, correcting the average value by combining the reactive power amount to be adjusted and the power constraint condition of the box transformer equipment in the photovoltaic power station to obtain a first reactive power adjustment amount of the box transformer equipment to be obtained, wherein the first reactive power adjustment amount is a reactive power adjustment amount share distributed by the box transformer equipment from the reactive power amount to be adjusted, and the accumulated sum of the first reactive power adjustment amount is not greater than the reactive power amount to be adjusted;
calculating an average power angle parameter and an average apparent power parameter of the inverter group according to the inverter group under the box transformer substation equipment, wherein the inverter group is an equipment group consisting of inverters which are not distributed with second reactive power adjustment amount in the box transformer substation equipment;
according to the average power angle parameter of the inverter group, combining the calculation of a power angle reactive power optimization formula to obtain a fifth reactive power adjustment quantity of the inverter to be solved, wherein the power angle reactive power optimization formula specifically comprises:
in the formula, Q 1 opti_1 For the fifth reactive power adjustment, Q ij Is the reactive power parameter, P, of the jth inverter of the ith box-type substation equipment ij The active power parameter of the jth inverter of the ith box transformer equipment,
is the level of the inverter groupA power-sharing angle parameter, n being the number of inverters in the group of inverters,
the unallocated remaining adjustment quantity, Q, in the first reactive adjustment quantity of the ith box transformer equipment i1 For the reactive power parameter, P, of the inverter to be solved i1 The active power parameter of the inverter to be solved is obtained;
according to the average apparent power parameter of the inverter group, calculating by combining an apparent power reactive power optimization formula to obtain a sixth reactive power adjustment quantity of the inverter to be solved, wherein the apparent power reactive power optimization formula specifically comprises:
in the formula (I), the compound is shown in the specification,
for the sixth reactive power adjustment amount,
is an average apparent power parameter, Q, of the inverter group ij Is the reactive power parameter, P, of the jth inverter of the ith box-type substation equipment ij The active power parameter, Q, of the jth inverter of the ith box transformer equipment i1 For the reactive power parameter, P, of the inverter to be solved i1 Is an active power parameter of the inverter to be solved, n is the number of inverters in the inverter group,
the unallocated residual pitch in the first reactive pitch of the ith box transformer substation equipmentThe whole amount is calculated;
and correcting the average value according to the average value of the fifth reactive power adjustment quantity and the sixth reactive power adjustment quantity and by combining the first reactive power adjustment quantity and the power constraint conditions of all inverters in the box-type substation equipment to obtain a second reactive power adjustment quantity of the inverters so as to perform reactive power regulation and control on the inverters according to the second reactive power adjustment quantity corresponding to all the inverters, wherein the second reactive power adjustment quantity is a reactive power adjustment quantity share distributed by the inverters from the first reactive power adjustment quantity, and the sum of the second reactive power adjustment quantities is not greater than the first reactive power adjustment quantity.
2. The reactive power regulation method for the photovoltaic power plant according to claim 1, wherein after the calculating the second reactive power adjustment amount of each inverter, the method further comprises:
and correcting the first reactive adjustment quantity of the box transformer substation equipment to be obtained according to the accumulated sum of the second reactive adjustment quantities of all inverters in the box transformer substation equipment, so as to calculate or correct the first reactive adjustment quantity of the remaining box transformer substation equipment according to the reactive adjustment quantity to be adjusted and the corrected first reactive adjustment quantity.
3. The reactive power regulation and control method for the photovoltaic power station as claimed in claim 2, wherein the first reactive power regulation amount is calculated in an order from the box transformer equipment closest to the grid-connected point to the box transformer equipment farthest from the grid-connected point.
4. The reactive power regulation method for the photovoltaic power station according to claim 1, wherein the step of obtaining the reactive power to be regulated of the photovoltaic power station to be regulated further comprises:
and when the reactive power to be adjusted exceeds the adjustable capacity of the photovoltaic power station, correcting the reactive power to be adjusted according to the adjustable capacity.
5. The reactive power regulation and control method for the photovoltaic power station as claimed in claim 1, wherein the power constraint condition of the box transformer substation equipment in the photovoltaic power station specifically includes: the capacity constraint of the box transformer substation equipment and the voltage constraint of the box transformer substation equipment.
6. The reactive power regulation method for the photovoltaic power station as claimed in claim 1, wherein the power constraint condition of the inverter in the photovoltaic power station specifically includes: an inverter capacity constraint, an inverter voltage constraint, and an inverter reactive quota constraint.
7. The utility model provides a reactive regulation and control device of photovoltaic power plant which characterized in that includes:
the device comprises a to-be-adjusted reactive power obtaining unit, a to-be-adjusted reactive power obtaining unit and a to-be-adjusted reactive power obtaining unit, wherein the to-be-adjusted reactive power obtaining unit is used for obtaining the to-be-adjusted reactive power of the to-be-adjusted photovoltaic power station;
a first reactive adjustment amount calculation unit, configured to calculate, according to the reactive amount to be adjusted and a power constraint condition of a box transformer device in the photovoltaic power station, and in combination with a first reactive adjustment amount distribution policy, a first reactive adjustment amount of the box transformer device to be obtained, where the first reactive adjustment amount is a reactive adjustment amount share distributed by the box transformer device from the reactive amount to be adjusted, and an accumulated sum of the first reactive adjustment amounts is not greater than the reactive amount to be adjusted;
the inverter regulation and control unit is used for calculating and obtaining a second reactive power regulation quantity of each inverter according to the first reactive power regulation quantity and power constraint conditions of each inverter in the box transformer substation equipment and by combining a second reactive power regulation quantity distribution strategy, so that the inverters can be subjected to reactive power regulation and control according to the second reactive power regulation quantity corresponding to each inverter, the second reactive power regulation quantity is a reactive power regulation quantity share distributed from the first reactive power regulation quantity by the inverters, and the sum of the second reactive power regulation quantity is not greater than the first reactive power regulation quantity;
the first reactive adjustment amount calculating unit is specifically configured to: calculating an average power angle parameter and an average apparent power parameter of a box transformer substation equipment group according to the box transformer substation equipment group under the photovoltaic power station, wherein the box transformer substation equipment group is an equipment group consisting of box transformer substation equipment which is not distributed with a first reactive adjustment amount in the photovoltaic power station;
according to the average power angle parameter of the box transformer substation equipment group, combining with the calculation of a power angle reactive power optimization formula, obtaining a third reactive power adjustment quantity of the box transformer substation equipment to be solved, wherein the power angle reactive power optimization formula specifically comprises:
in the formula, Q opti_1 For said third reactive adjustment, Q 1 For the reactive power parameter, P, of the box-type substation equipment to be solved 1 For the active power parameter of the box transformer equipment to be solved,
is the average power angle parameter of the box transformer substation equipment group, m is the number of the box transformer substation equipment in the box transformer substation equipment group, Q i Is a reactive power parameter, P, of the ith box-to-box equipment i Is an active power parameter, Q, of the ith box transformer equipment sur The residual adjustment quantity which is not distributed in the reactive quantity to be adjusted is obtained;
according to the average apparent power parameter of the box transformer equipment group
And calculating an apparent power reactive power optimization formula to obtain a fourth reactive power adjustment quantity of the box transformer substation equipment to be solved, wherein the apparent power reactive power optimization formula specifically comprises the following steps:
in the formula, Q opti_2 For the fourth reactive power adjustment amount is,
an average apparent power parameter for the group of box transformer equipment; q i Is a reactive power parameter, P, of the ith box-to-box equipment i Is an active power parameter, Q, of the ith box transformer equipment 1 For the reactive power parameter, P, of the box-type substation equipment to be solved 1 For the active power parameter, Q, of the box-to-substation equipment to be solved sur The residual adjustment quantity which is not distributed in the reactive quantity to be adjusted is obtained;
according to the average value of the third reactive power adjustment amount and the fourth reactive power adjustment amount, correcting the average value by combining the reactive power amount to be adjusted and the power constraint condition of the box transformer equipment in the photovoltaic power station to obtain a first reactive power adjustment amount of the box transformer equipment to be obtained, wherein the first reactive power adjustment amount is a reactive power adjustment amount share distributed by the box transformer equipment from the reactive power amount to be adjusted, and the accumulated sum of the first reactive power adjustment amount is not greater than the reactive power amount to be adjusted;
the inverter regulation and control unit is specifically configured to: calculating an average power angle parameter and an average apparent power parameter of the inverter group according to the inverter group under the box transformer substation equipment, wherein the inverter group is an equipment group consisting of inverters which are not distributed with second reactive power adjustment amount in the box transformer substation equipment;
according to the average power angle parameter of the inverter group, combining the calculation of a power angle reactive power optimization formula to obtain a fifth reactive power adjustment quantity of the inverter to be solved, wherein the power angle reactive power optimization formula specifically comprises:
in the formula, Q 1 opti_1 For the fifth reactive power adjustment, Q ij Is the reactive power parameter, P, of the jth inverter of the ith box-type substation equipment ij The active power parameter of the jth inverter of the ith box transformer equipment,
is an average power angle parameter for the group of inverters, n is a number of inverters in the group of inverters,
the unallocated remaining adjustment quantity, Q, in the first reactive adjustment quantity of the ith box transformer equipment i1 For the reactive power parameter, P, of the inverter to be solved i1 The active power parameter of the inverter to be solved is obtained;
according to the average apparent power parameter of the inverter group, calculating by combining an apparent power reactive power optimization formula to obtain a sixth reactive power adjustment quantity of the inverter to be obtained, wherein the apparent power reactive power optimization formula specifically comprises:
in the formula (I), the compound is shown in the specification,
for the sixth reactive power adjustment amount,
is the inverterAverage apparent power parameter, Q, of the group ij Is the reactive power parameter, P, of the jth inverter of the ith box-type substation equipment ij The active power parameter, Q, of the jth inverter of the ith box transformer equipment i1 For the reactive power parameter, P, of the inverter to be found i1 Is an active power parameter of the inverter to be solved, n is the number of inverters in the inverter group,
the remaining unallocated adjustment amount in the first reactive adjustment amount of the ith box transformer substation equipment;
and correcting the average value according to the average value of the fifth reactive power adjustment quantity and the sixth reactive power adjustment quantity and by combining the first reactive power adjustment quantity and the power constraint conditions of all inverters in the box-type substation equipment to obtain a second reactive power adjustment quantity of the inverters so as to perform reactive power regulation and control on the inverters according to the second reactive power adjustment quantity corresponding to all the inverters, wherein the second reactive power adjustment quantity is a reactive power adjustment quantity share distributed by the inverters from the first reactive power adjustment quantity, and the sum of the second reactive power adjustment quantities is not greater than the first reactive power adjustment quantity.
8. The utility model provides a reactive regulation and control terminal of photovoltaic power plant which characterized in that includes: a memory and a processor;
the memory is used for storing program codes, and the program codes correspond to the photovoltaic power station reactive power regulation method in any one of claims 1 to 6;
the processor is configured to execute the program code.
9. A computer-readable storage medium having stored therein program code corresponding to a method of reactive power regulation of a photovoltaic power plant as claimed in any one of claims 1 to 6.
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