CN113315164B - Reactive voltage control method and device, medium and computing device - Google Patents
Reactive voltage control method and device, medium and computing device Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The disclosure provides a reactive voltage control method and device, a medium and a computing device. The reactive voltage control method comprises the following steps: determining the short-circuit capacity ratio of the system operation according to the short-circuit capacity of the system operation and the rated power of the new energy station; determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm according to the range of the short-circuit capacity ratio of the system; and performing reactive voltage control by using a proportional integral algorithm based on the determined proportional coefficient and integral coefficient. According to the reactive voltage control method provided by the embodiment of the invention, the reactive voltage can be quickly and accurately controlled.
Description
Technical Field
The present invention relates generally to the field of new energy, and more particularly, to a reactive voltage control method and apparatus, medium, and computing apparatus.
Background
In the whole energy of the electric power system, with the continuous improvement of new energy occupation ratio and the continuous increase of single machine capacity, the installed capacity of a station is also repeatedly innovative.
The new energy station development has the characteristics of large scale, centralized development mode and the like. However, due to the inherent intermittent characteristic of new energy power generation, large-scale new energy grid connection brings great challenges to power grid operation. In addition, a new energy grid-connected area is often lack of local loads and conventional power supply support, and electric energy sent by a new energy field station needs to be sent to a load center through a long distance, so that a power transmission channel has large reactive voltage fluctuation along with the change of new energy output. Therefore, higher and higher requirements are put on reactive power control and voltage stability of the new energy station.
Although the traditional voltage and reactive power control theory and technology are mature, the traditional voltage and reactive power control theory and technology are limited by a plurality of factors such as the overall topological structure of a system, communication and the like, the currently applied reactive power control method only considers the current time section of the power system, and only when the actual system measured voltage value exceeds a threshold value or approaches the threshold value, the control logic is triggered, so that the control is actually a hysteresis control and is essentially a passive control. However, the load fluctuation of new energy power generation is often large, the influence on the voltage change is large, and the current single-step regulation and control mode based on the system impedance mode cannot meet the control requirement, so that a rapid closed-loop control mode is needed for a station control system to facilitate rapid tracking of the system voltage change and timely carry out deviation rectification adjustment control on the voltage, so that the voltage is in an operation control target range with high speed and high precision.
Disclosure of Invention
An object of an exemplary embodiment of the present invention is to provide a reactive voltage control method and a reactive voltage control apparatus capable of rapidly controlling a reactive voltage.
According to an aspect of the present invention, there is provided a reactive voltage control method including: determining a system operation short-circuit capacity ratio according to the system operation short-circuit capacity and the rated power of the new energy station; determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm according to the range of the short-circuit capacity ratio of the system; and performing reactive voltage control by using a proportional-integral algorithm based on the determined proportional coefficient and integral coefficient.
According to an embodiment of the present invention, the reactive voltage control method may further include: acquiring the electrical information quantity of a high-voltage side or a low-voltage side of the new energy station; the system operation short circuit capacity is calculated based on the electrical information quantity.
According to an embodiment of the invention, the step of acquiring the electrical information amount of the high-voltage side or the low-voltage side of the new energy station may include: acquiring the electric information quantity of a high-voltage side or a low-voltage side of the new energy station at the current moment and the electric information quantity at the previous moment, wherein the electric information quantity comprises active power, reactive power and voltage; the step of calculating the short circuit capacity of the system operation based on the electric information amount comprises the following steps: and calculating the operation short-circuit capacity of the system based on the acquired electric information amount at the current moment and the electric information amount at the last moment.
According to an embodiment of the present invention, the step of determining the scaling factor and the integration factor of the proportional-integral algorithm according to the range in which the short circuit capacity ratio is operated by the system may include: in response to the system operational short circuit capacity ratio being greater than a predetermined threshold, the system operational short circuit capacity ratio is determined to be active.
According to an embodiment of the present invention, the step of determining the scaling factor and the integration factor of the proportional-integral algorithm according to the range in which the short circuit capacity ratio is operated by the system may include: when the system operation short circuit capacity ratio is in different ranges, different proportionality coefficients and different integral coefficients are determined.
According to the embodiment of the invention, when the short-circuit capacity ratio of the system operation is larger than a first preset value, the proportional coefficient and the integral coefficient of the proportional-integral algorithm can be determined to be a first proportional coefficient and a first integral coefficient respectively; when the short-circuit capacity ratio of the system operation is larger than a second preset value and smaller than or equal to a first preset value, determining the proportional coefficient and the integral coefficient of the proportional-integral algorithm as a second proportional coefficient and a second integral coefficient respectively; when the system operation short-circuit capacity ratio is larger than a third preset value and smaller than or equal to a second preset value, the proportional coefficient and the integral coefficient of the proportional-integral algorithm can be determined to be a third proportional coefficient and a third integral coefficient respectively.
According to an embodiment of the present invention, the step of performing the reactive voltage control using a proportional-integral algorithm based on the determined proportional coefficient and integral coefficient may include: and taking the deviation of the reactive voltage target value and the actual reactive voltage as the input of a proportional-integral algorithm, calculating a control instruction of a reactive power source of the new energy station, and issuing the control instruction to the reactive power source to enable the reactive voltage to approach the reactive voltage target value.
According to another aspect of the present invention, there is provided a computer readable storage medium having stored thereon instructions or code which, when executed by a processor, implement the above reactive voltage control method.
According to another aspect of the present invention, there is provided a reactive voltage control apparatus, which may include: the system operation short-circuit capacity ratio determining module is configured to calculate the system operation short-circuit capacity ratio according to the system operation short-circuit capacity and the rated power of the new energy station; the coefficient determining module is configured to determine a proportional coefficient and an integral coefficient of the proportional-integral controller according to a range in which the system operation short-circuit capacity ratio is located; a reactive voltage control module configured to perform reactive voltage control using a proportional-integral controller based on the determined proportional coefficient and integral coefficient.
According to an embodiment of the present invention, the reactive voltage control apparatus may further include: the detection module is configured to acquire the electric information quantity of the high-voltage side or the low-voltage side of the new energy station; a calculation module configured to calculate a system operation short circuit capacity based on the electrical information amount.
According to an embodiment of the invention, the coefficient determination module may be further configured to: in response to the system operational short circuit capacity ratio being greater than a predetermined threshold, the system operational short circuit capacity ratio is determined to be active.
According to an embodiment of the invention, the coefficient determination module may be further configured to: when the system operation short-circuit capacity ratio is larger than a first preset value, determining a proportional coefficient and an integral coefficient of a proportional-integral controller as a first proportional coefficient and a first integral coefficient respectively; when the system operation short-circuit capacity ratio is larger than a second preset value and smaller than or equal to a first preset value, determining a proportional coefficient and an integral coefficient of the proportional-integral controller to be a second proportional coefficient and a second integral coefficient respectively; and determining the proportional coefficient and the integral coefficient of the proportional-integral controller to be a third proportional coefficient and a third integral coefficient respectively in response to the system operation short-circuit capacity ratio being larger than a third preset value and smaller than or equal to a second preset value.
According to another aspect of the present invention, there is provided a computing device comprising a computer-readable storage medium and a processor, the computer-readable storage medium storing instructions or code which, when executed by the processor, performs the reactive voltage control method described above.
Additional aspects and/or advantages of the present general inventive concept will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the general inventive concept.
Drawings
The above and other objects and features of the exemplary embodiments of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings which illustrate exemplary embodiments thereof, wherein:
fig. 1 is a flow chart illustrating a reactive voltage control method according to a first embodiment of the present invention;
fig. 2 is a flow chart illustrating a reactive voltage control method according to a second embodiment of the present invention;
fig. 3 is a flow chart illustrating a reactive voltage control method according to a third embodiment of the present invention;
fig. 4 is a simplified equivalent circuit diagram of the power supply system of the new energy station.
Fig. 5 is a block diagram showing a reactive voltage control apparatus according to a first embodiment of the present invention;
fig. 6 is a block diagram showing a reactive voltage control apparatus according to a second embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.
According to the embodiment of the invention, the reactive voltage of the power supply system is controlled by adopting a rapid PI control strategy, and the overall control has the advantages of high adjustment speed and high precision.
In addition, the invention further considers the variability of the system operation mode, introduces the real-time system operation short-circuit capacity, calculates the real-time system operation short-circuit capacity ratio of the new energy station according to the real-time system operation short-circuit capacity, represents the strength degree of the system, and further divides the PI parameters integrally according to the strength degree of the system to perform segmented control.
In the actual operation of the new energy power supply system, if the operation mode is greatly changed, the operation mode can be directly reflected in a mode of a system operation short-circuit capacity ratio, so that the system operation short-circuit capacity ratio can be combined to timely adjust the reactive voltage control parameters of the system in real time, the PI control parameters are corrected on line, the high precision and the quick response speed of the overall control on the whole time dimension are guaranteed, meanwhile, the applicability of the overall control algorithm is improved, and the stability of the system operation control is guaranteed.
The reactive voltage control method and apparatus according to an embodiment of the present invention may be used to control the reactive voltage of a new energy farm, such as a wind farm, but is not limited thereto. Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart illustrating a reactive voltage control method according to a first embodiment of the present invention, fig. 2 is a flowchart illustrating a reactive voltage control method according to a second embodiment of the present invention, fig. 3 is a flowchart illustrating a reactive voltage control method according to a third embodiment of the present invention, and fig. 4 is a simplified equivalent circuit diagram of a power supply system of a new energy farm.
According to an embodiment of the present invention, the reactive voltage control method may include steps S110, S120, and S130.
In step S110, a system operation short-circuit capacity ratio is determined according to the system operation short-circuit capacity and the rated power of the new energy station.
As described above, if the operation mode of the power supply system of the new energy station changes greatly, the short-circuit capacity ratio of the system operation changes accordingly, so that the short-circuit capacity ratio of the system operation can reflect the change, and the control parameter (proportional integral control parameter) of the reactive voltage of the system is adjusted in real time in combination with the short-circuit capacity ratio of the system operation, so that the Proportional Integral (PI) control parameter (where the PI control parameter includes the coefficient or constant of the proportional term and the coefficient or constant of the integral term of the PI algorithm or PI controller, hereinafter referred to as the proportional coefficient and the integral coefficient) can be corrected online.
The operation short-circuit capacity of the system can be calculated based on the electric information quantity of the high-voltage side or the low-voltage side of the new energy station. The reactive voltage control method of the embodiment of the invention may further include the steps of acquiring an electrical information amount of a high-voltage side or a low-voltage side of the new energy station and calculating an operation short-circuit capacity of the system based on the electrical information amount. The new energy station can be a wind power station or a photovoltaic station, or a station comprising a wind generating set and/or a photovoltaic generating system.
The electrical information quantity of the high-voltage side or the low-voltage side of the new energy station can be measured in real time through various sensors and the like.
The system operation short-circuit capacity ratio can be obtained by dividing the system operation short-circuit capacity by the rated power of the new energy station, but is not limited to the above.
In step S120, the proportional coefficient and the integral coefficient of the proportional-integral algorithm are determined according to the range in which the system operates the short-circuit capacity ratio. Specifically, the PI control parameter may be set to be the same control parameter when the system operation short-circuit capacity ratio is changed within a certain range, that is, the proportional coefficient is not changed, and the integral coefficient is not changed.
In step S130, reactive voltage control is performed using a proportional-integral algorithm based on the determined proportional coefficient and integral coefficient. Specifically, the step of performing reactive voltage control using a proportional-integral algorithm based on the determined proportional coefficient and integral coefficient may include: and taking the deviation of the reactive voltage target value and the actual reactive voltage as the input of a proportional-integral algorithm, calculating a control instruction of a reactive power source of the new energy station, and issuing the control instruction to the reactive power source to enable the reactive voltage to approach the reactive voltage target value.
Here, the deviation between the reactive voltage target value and the actual reactive voltage is used as the input of the proportional-integral algorithm, which is merely an example, and the deviation between the reactive power and the actual reactive power may be used as the input of the proportional-integral algorithm, or a plurality of variables may be controlled in common.
It should be noted that the PI algorithm or PI controller of the present invention can also be regarded as a PID algorithm or PID controller, in which the differential coefficient is zero.
Obtaining electricity on high-voltage side or low-voltage side of new energy stationThe step of information content may comprise: the electrical information amount at different times is acquired, and specifically, the electrical information amount at the present time and the electrical information amount at the previous time can be acquired. In this case, the step of calculating the short circuit capacity of the system operation based on the electrical information amount may include: calculating the system operation short-circuit capacity S based on the acquired electric information amount at the current moment and the electric information amount at the previous moment kOSC 。
Specifically, as shown in fig. 2, according to an embodiment of the present invention, the reactive voltage control method may include steps S210, S220, S230, and S240.
In step S210, the electrical information amount at the current time (for example, time k) and the electrical information amount at the last time (for example, time k-1) are obtained, and the electrical information amounts may include active power, reactive power, voltage and the like at the high-voltage side or the low-voltage side of the new energy farm, as an example. That is, the electrical information amount at the present time (for example, time k) and the electrical information amount at the last time (for example, time k-1) on the high-voltage side or the low-voltage side of the new energy station can be acquired.
As an example, a typical OSCR value of the system may be obtained through tuning or simulation according to a specific field, so as to obtain an optimal PI control parameter through simulation or actual project debugging, where the optimal PI control parameter may be used as an initial value or a default value.
In step S220, the system operation short-circuit capacity is calculated based on the acquired electrical information amount at the present time and the electrical information amount at the previous time.
How to determine the system operation short-circuit capacity ratio based on the electrical information amount and the rated power of the new energy station will be described below with reference to fig. 4.
Specifically, as shown in fig. 4, the equivalent potential at the time of system operation is E = E x +jE y The equivalent impedance of the system is Z = R + jX, the voltage amplitude of the main transformer high-voltage side of a new energy station (such as a wind power plant) is V, the active power is P, the reactive power is Q, and the running short-circuit capacity of the system is S OSC 。
At time k, the equivalent potential of the system is E k ＝E kx +jE ky Equivalent ofImpedance of Z k ＝R k +jX k The voltage amplitude value of the main transformer high-voltage side of the new energy station (such as a wind power station) is V k Active power is P k With reactive power of Q k The short circuit capacity of the system operation is S kOSC 。
The current value of the system at the time k can be calculated according to the active power, the reactive power and the voltage, and is specifically described in the following formula 1.
After finishing, the following formula can be obtained:
that is, the following formula 2 can be obtained:
at time k-1, the equivalent potential of the system is E k-1 ＝E (k-1)x +jE (k-1)y Equivalent impedance of Z k-1 ＝R k-1 +jX k-1 The voltage amplitude of the high-voltage side of the main transformer is V k-1 Active power is P k-1 With reactive power Q k-1 。
Further, the following formula 3 can be obtained:
based on the system operating characteristics, time k and time k-1 are established as follows:
wherein E is kx 、E ky 、E (k-1)x 、E (k-1)y Respectively the real part of the equivalent potential at the time k, the imaginary part of the equivalent potential at the time k, the real part of the equivalent potential at the time k-1, the imaginary part of the equivalent potential at the time k-1, R k 、X k 、R k-1 、X k-1 The resistance of the k-time system, the reactance of the k-time system, the resistance of the k-1-time system, and the reactance of the k-1-time system are respectively expressed by the formula (2), the formula (3), and the formula (4) in combination to obtain the formula 5, and further the formula E can be expressed by the formula kx 、E ky 、R k 、X k The solution is carried out, including:
order:
|H|＝(-V k Q (k-1) +V (k-1) Q k ) 2 +(V k P (k-1) -V (k-1) P k ) 2
|B|＝V k V (k-1) (V (k-1) -V k )(Q k Q (k-1) +Q (k-1) P k )
further, the following is obtained:
therefore, the short-circuit capacity of the system operation at the moment k is as follows:
since the access system voltage level is generally high, R is calculated during the process k May take a value of 0, then equation (7) may vary as:
it should be noted that, since the voltage level of the access system is generally high, R is calculated in the calculation process k A value of 0 may be taken, which is determined by the system characteristics. In practical application, the voltage and current values of the high-voltage side or the low-voltage side of the new energy station are also selected according to actual requirements to calculate the system operation capacity.
Since reactive voltage control generally controls the voltage of the high-voltage bus of the new energy station, the calculation point is preferably the high-voltage side of the new energy station.
In step S230, a system operation short-circuit capacity ratio is determined according to the system operation short-circuit capacity and the rated power of the new energy station.
Specifically, the system operation short-circuit capacity ratio of the new energy station at the time k is as follows:
P t ＝n×P d (formula 10)
P t Is the rated power of a new energy station (e.g. a wind power station), and when the station is a wind power station, p d May be the rated power of a single wind park and n is the number of wind parks of the wind park.
In step S240, the proportional coefficient and the integral coefficient of the proportional-integral algorithm are determined according to the range in which the system operates the short-circuit capacity ratio.
In step S250, reactive voltage control is performed using a proportional-integral algorithm based on the determined proportional coefficient and integral coefficient. Specifically, as described above, the deviation between the reactive voltage target value and the actual reactive voltage is used as the input of the proportional-integral algorithm, the control command of the reactive power source of the new energy station is calculated, and the control command is issued to the reactive power source, so that the reactive voltage approaches the reactive voltage target value.
The step of determining the proportional coefficient and the integral coefficient of the proportional-integral algorithm according to the range in which the system operates the short circuit capacity ratio (e.g., step S240) may include: it is determined whether the system operation short circuit capacity ratio is valid.
As an example, in response to the system operation short-circuit capacity ratio being greater than a predetermined threshold (e.g., a third predetermined value n3 mentioned below), the system operation short-circuit capacity ratio is determined to be valid. And determining that the system operation short-circuit capacity ratio is invalid in response to the system operation short-circuit capacity ratio being less than or equal to a third predetermined value.
Accordingly, the step of determining the proportionality coefficient and the integration coefficient of the proportional-integral algorithm according to the range in which the system operation short-circuit capacity ratio is located (e.g., step S240) may include the step of determining that the system operation short-circuit capacity ratio is valid in response to the system operation short-circuit capacity ratio being greater than a predetermined threshold (e.g., a third predetermined value n3 mentioned below).
Generally, the short-circuit capacity ratio of the system operation is not less than or equal to the third predetermined value. If an extreme condition occurs, the PI control parameter can be maintained, and the reactive voltage can be controlled in other modes.
The step of determining the proportional coefficient and the integral coefficient of the proportional-integral algorithm according to the range in which the system operates the short circuit capacity ratio (e.g., step S240) may include or may further include: when the system operation short-circuit capacity ratio is in different ranges, different proportionality coefficients and different integral coefficients are determined.
When the short-circuit capacity ratio of the system operation is changed in a certain range, the PI control parameter can be set as the same control parameter, namely, the proportional coefficient is not changed, and the integral coefficient is not changed. When the system operation short-circuit capacity ratio is changed in another range, the PI control parameter may be set as another control parameter.
A flowchart for performing the segment control on the PI control parameter according to the range in which the PI control parameter is located will be described below with reference to fig. 3. The step of determining the proportionality coefficient and the integral coefficient of the proportional-integral algorithm according to the range in which the system operates the short circuit capacity ratio (e.g., step S240) may include steps S2401, S2402, S2403, and S2404.
As shown in fig. 3, in step S2401, it may be determined whether a system operation short-circuit capacity ratio (OSCR) is greater than a first predetermined value (n 1), and if the OSCR is greater than the first predetermined value, a first set of PI parameters (or PI control parameters) may be used, where n1 may be greater than or equal to 5, and may be adjusted according to engineering application, and through actual engineering application, a recommended value is preferably 5.
Specifically, when the system operation short-circuit capacity ratio is greater than a first predetermined value (n 1), the proportional coefficient and the integral coefficient of the proportional-integral algorithm may be determined to be a first proportional coefficient and a first integral coefficient, respectively. In other words, when the system operation short-circuit capacity ratio is changed within a range greater than the first predetermined value, the proportionality coefficient may be held as the first proportionality coefficient, and the integration coefficient may be held as the first integration coefficient.
In step S2402, when n1 is greater than or equal to OSCR > n2 (a second predetermined value), a second set of PI parameters may be adopted, where n1 is greater than n2 and is greater than or equal to 3, and may be set according to engineering application, and through actual engineering application, the preferred recommended value of n2 is 3.
Specifically, when the system operation short-circuit capacity ratio is greater than the second predetermined value (n 2) and equal to or less than the first predetermined value (n 1), the proportional coefficient and the integral coefficient of the proportional-integral algorithm may be determined to be the second proportional coefficient and the second integral coefficient, respectively.
In other words, when the system operation short-circuit capacity ratio is changed within a range greater than the second predetermined value and equal to or less than the first predetermined value, the proportionality coefficient may be held as the second proportionality coefficient, and the integration coefficient may be held as the second integration coefficient.
In step S2403, when n2 is greater than or equal to OSCR > n3 (a third predetermined value), a third set of PI parameters may be adopted, where n3 may be greater than or equal to 2, n3 may be adjusted according to engineering application, and through practical engineering application, a recommended value is preferably 2.
When the system operation short-circuit capacity ratio is larger than a third preset value (n 3) and is smaller than or equal to a second preset value (n 2), the proportional coefficient and the integral coefficient of the proportional-integral algorithm can be determined to be a third proportional coefficient and a third integral coefficient respectively.
In other words, when the system operation short-circuit capacity ratio is changed within a range of the third predetermined value and equal to or less than the second predetermined value, the proportionality coefficient may be held as the third proportionality coefficient, and the integration coefficient may be held as the third integration coefficient.
The first, second, third, first, second, and third proportionality coefficients may be optimal PI control parameters for OSCR within corresponding ranges, and may be predetermined.
In step S2404, when the system operation short-circuit capacity ratio is equal to or less than the third predetermined value n3, the PI parameter may be kept different.
In step S250, reactive voltage control is performed by using a proportional integral algorithm based on the determined proportional coefficient and integral coefficient, and specifically, a control instruction of a reactive power source of the new energy station may be calculated by using a deviation of a reactive voltage target value from an actual reactive voltage as an input of the proportional integral algorithm, and the control instruction is issued to the reactive power source so that the reactive voltage approaches the reactive voltage target value.
According to the reactive voltage control method and device provided by the embodiment of the invention, the Proportional Integral (PI) control parameter can be regulated or controlled in a segmented manner based on the range of the short-circuit capacity ratio (OSCR) of the system, so that the PI control parameter can be regulated in real time, and the control precision and regulation speed of the reactive voltage can be improved.
The existing reactive voltage control mostly adopts a fixed control mode, namely a system control constant value parameter cannot be corrected instantly along with the change of the operation mode of a system, so that when the operation mode of the system changes, a reactive voltage control system adopting an inherent constant value cannot sense the change of the system in time, so that the control effect of a station under the reactive voltage control under the current time section is good, once the operation mode of the system changes, the integral control effect is not ideal, and more serious, the larger the change of the operation mode of the system is, the poorer the integral control effect is, the change of the operation mode of the system is very common in the system, great difficulty is brought to the integral control meeting the control requirements under the whole time dimension, the reactive voltage cannot achieve the expected effect in the control process and the target, and finally the qualification rate of the voltage control cannot be improved fundamentally.
According to the reactive voltage control method provided by the embodiment of the invention, the PI control parameters can be adjusted on line in real time, and the control speed, the control precision and the control effect are superior to those of the reactive voltage control strategy of the conventional sampling fixed control mode.
Fig. 5 is a block diagram showing a reactive voltage control apparatus according to a first embodiment of the present invention, and fig. 6 is a block diagram showing a reactive voltage control apparatus according to a second embodiment of the present invention.
According to an embodiment of the present invention, the reactive voltage control apparatus 400 may include a system operation short circuit capacity ratio determination module 410, a coefficient determination module 420, and a reactive voltage control module 430. The reactive voltage control apparatus 400 may further include a detection module 401 and a calculation module 402.
The system operation short circuit capacity ratio determination module 410 may calculate the system operation short circuit capacity ratio according to the system operation short circuit capacity and the rated power of the new energy station. The calculation method of the system operation short-circuit capacity and the system operation short-circuit capacity ratio can be as described above, and details are not repeated here. In addition, it should be noted that the above-mentioned manner of calculating the system operation short-circuit capacity and the system operation short-circuit capacity ratio is merely an example, and the present invention is not limited thereto.
The coefficient determination module 420 may determine whether the system operation short circuit capacity ratio is valid. If the short-circuit capacity ratio of the system operation is effective, a segmented control mode can be adopted for control. If the system runs with a short circuit capacity ratio invalid, the PI control parameters may be maintained or other control strategies may be employed.
The coefficient determination module 420 may determine that the system operating short circuit capacity ratio is valid in response to the system operating short circuit capacity ratio being greater than a predetermined threshold.
The coefficient determination module 420 may determine the scaling factor and the integration factor of the proportional-integral controller according to a range in which the system operation short-circuit capacity ratio is located, and specifically, the coefficient determination module 420 may determine different scaling factors and different integration factors in response to the system operation short-circuit capacity ratio being in different ranges, and may also keep the PI control parameter unchanged in response to the system operation short-circuit capacity ratio changing in a certain continuous range.
The amount of electrical information may be detected in real time or received from other modules.
As an example, the reactive voltage control device 400 may further include a detection module 401 and a calculation module 402, the detection module 401 may acquire an electrical information amount of a high-voltage side or a low-voltage side of the new energy station, and the calculation module 402 may calculate the short-circuit capacity of the system based on the electrical information amount. The detection module 401 may include various sensors, and the calculation module 402, the coefficient determination module 420, and the system operation short circuit capacity ratio determination module 410 may be implemented by software and/or hardware.
As an example, the detection module 401 may acquire the amount of electrical information at the current time (e.g., time k) and the amount of electrical information at the previous time (e.g., time k-1), and the calculation module 402 may calculate the system operation short-circuit capacity based on the acquired amount of electrical information at the current time and the amount of electrical information at the previous time.
As described above, the system operation short-circuit capacity and the system operation short-circuit capacity ratio may be calculated according to the electrical information such as active power, reactive power, and voltage on the high-voltage side or the low-voltage side of the new energy station.
The coefficient determination module 420 may determine the scaling factor and the integration factor of the proportional-integral controller as a first scaling factor and a first integration factor, respectively, in response to the system operation short circuit capacity ratio being greater than a first predetermined value. That is, if the OSCR is greater than the first predetermined value, the coefficient determination module 420 may employ a first set of PI parameters. In other words, when the system operation short circuit capacity ratio is changed within a range greater than the first predetermined value, the coefficient determination module 420 may maintain the proportionality coefficient as the first proportionality coefficient and maintain the integration coefficient as the first integration coefficient.
The coefficient determination module 420 may determine the scaling factor and the integration factor of the proportional-integral controller as a second scaling factor and a second integration factor, respectively, in response to the system operational short-circuit capacity ratio being greater than a second predetermined value and less than or equal to a first predetermined value.
That is, when n1 ≧ OSCR > n2 (second predetermined value), the coefficient determination module 420 may employ a second set of PI parameters. That is, when the system operation short-circuit capacity ratio is changed within a range greater than the second predetermined value and equal to or less than the first predetermined value, the coefficient determination module 420 may maintain the proportionality coefficient as the second proportionality coefficient and maintain the integration coefficient as the second integration coefficient.
The coefficient determination module 420 may determine the scaling factor and the integral factor of the proportional-integral controller as a third scaling factor and a third integral factor, respectively, in response to the system operation short-circuit capacity ratio being greater than a third predetermined value and less than or equal to a second predetermined value.
That is, if n2 ≧ OSCR > n3 (third predetermined value), the coefficient determination module 420 may employ a third set of PI parameters. That is, when the system operation short-circuit capacity ratio is changed within a range of the third predetermined value and equal to or less than the second predetermined value, the coefficient determination module 420 may maintain the proportionality coefficient as the third proportionality coefficient and maintain the integration coefficient as the third integration coefficient.
The reactive voltage control module 430 may utilize a proportional integral controller based on the determined scaling and integration coefficients, here a portion of the proportional integral controller reactive voltage control module 430, for reactive voltage control.
Specifically, the reactive voltage control module 430 may calculate a control instruction of a reactive source of the new energy station with a deviation of the reactive voltage target value from the actual reactive voltage as an input of a proportional-integral algorithm, and issue the control instruction to the reactive source so that the reactive voltage approaches the reactive voltage target value.
The respective operations of the above-described steps may be written as software programs or instructions, and thus, the feedforward control method according to the exemplary embodiment of the present invention may be implemented via software, and the computer-readable storage medium of the exemplary embodiment of the present invention may store a computer program that, when executed by a processor, implements the reactive voltage control method as described in the above exemplary embodiment.
According to various embodiments of the present disclosure, an apparatus (e.g., a module or their functions) or a method may be implemented by a program or instructions stored in a computer-readable storage medium. In the case where the instruction is executed by a processor, the processor may perform a function corresponding to the instruction or perform a method corresponding to the instruction. At least a portion of the modules may be implemented (e.g., executed) by a processor. At least a portion of the programming modules may include modules, programs, routines, sets of instructions, and procedures for performing at least one function. In one example, the instructions or software include machine code that is directly executed by one or more processors or computers (such as machine code produced by a compiler). In another example, the instructions or software comprise higher level code that is executed by one or more processors or computers using an interpreter. The instructions or software may be written using any programming language based on the block diagrams and flow diagrams illustrated in the figures and the corresponding description in the specification.
Computer readable storage media include magnetic media such as floppy disks and magnetic tapes, optical media (including Compact Disc (CD) ROMs and DVD ROMs), magneto-optical media such as floppy disks, hardware devices such as ROMs, RAMs designed to store and execute program commands, and flash memories. The program command includes a language code executable by a computer using an interpreter and a machine language code generated by a compiler. The hardware devices described above may be implemented by one or more software modules for performing the operations of the various embodiments of the present disclosure.
A module or programming module of the present disclosure may include at least one of the foregoing components with some components omitted or other components added. Operations of the modules, programming modules, or other components may be performed sequentially, in parallel, in a loop, or heuristically. Further, some operations may be performed in a different order, may be omitted, or expanded with other operations.
The computer readable storage medium and/or the reactive voltage control device of the exemplary embodiments of the present invention may be part of a computing device, a controller or a control system.
For example, a computing device may be provided according to an exemplary embodiment of the invention, and may include: a processor (not shown) and a memory (not shown, which may be a computer readable storage medium), wherein the memory stores a computer program (code or instructions) which, when executed by the processor, implements the reactive voltage control method as described in the above exemplary embodiments.
According to the reactive voltage control method and the reactive voltage control device provided by the embodiment of the invention, the PI control parameters can be adjusted on line in real time, and the control speed, the control precision and the like of reactive voltage control are improved.
Although a few exemplary embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments, for example, in which features of different embodiments may be combined, without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (10)
1. A reactive voltage control method, comprising:
determining the ratio of the short-circuit capacity of the system operation according to the ratio of the short-circuit capacity of the system operation to the rated power of the new energy station;
determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm according to the range of the short-circuit capacity ratio of the system;
reactive voltage control is performed by using a proportional-integral algorithm based on the determined proportional coefficient and integral coefficient,
wherein the short-circuit capacity of the system operation is the short-circuit capacity of the system of the new energy station in operation,
wherein the system operation short-circuit capacity ratio is an operation short-circuit ratio of the system,
the step of determining the proportional coefficient and the integral coefficient of the proportional-integral algorithm according to the range of the short-circuit capacity ratio of the system comprises the following steps:
when the short circuit capacity ratio of the system operation is larger than a first preset value, determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm as a first proportional coefficient and a first integral coefficient respectively,
when the short-circuit capacity ratio of the system operation is larger than a second preset value and smaller than or equal to a first preset value, determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm as a second proportional coefficient and a second integral coefficient respectively,
when the short-circuit capacity ratio of the system operation is larger than a third preset value and smaller than or equal to a second preset value, determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm as a third proportional coefficient and a third integral coefficient respectively,
wherein the first predetermined value is greater than the second predetermined value, the second predetermined value is greater than the third predetermined value, and the second predetermined value is 3.
2. The reactive voltage control method of claim 1, further comprising:
acquiring the electrical information quantity of a high-voltage side or a low-voltage side of the new energy station;
and calculating the short-circuit capacity of the system operation based on the electrical information quantity.
3. The reactive voltage control method according to claim 2,
the step of obtaining the electrical information quantity of the high-voltage side or the low-voltage side of the new energy station comprises the following steps: acquiring the electrical information quantity of a high-voltage side or a low-voltage side of a new energy station at the current moment and the electrical information quantity at the last moment, wherein the electrical information quantity comprises active power, reactive power and voltage;
the step of calculating the system operation short circuit capacity based on the electrical information amount comprises the following steps: and calculating the short-circuit operation capacity of the system based on the acquired electric information amount at the current moment and the electric information amount at the last moment.
4. The reactive voltage control method of any of claims 1 to 3 wherein the step of determining the scaling and integration coefficients of a proportional-integral algorithm based on the range in which the system is operating a short circuit capacity ratio further comprises: determining that the system operational short circuit capacity ratio is valid in response to the system operational short circuit capacity ratio being greater than a predetermined threshold.
5. The reactive voltage control method of claim 1, wherein the step of performing reactive voltage control using a proportional-integral algorithm based on the determined proportional and integral coefficients comprises: and taking the deviation of the reactive voltage target value and the actual reactive voltage as the input of a proportional-integral algorithm, calculating a control instruction of a reactive power source of the new energy station, and issuing the control instruction to the reactive power source to enable the reactive voltage to approach the reactive voltage target value.
6. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon instructions or code which, when executed by a processor, implements a reactive voltage control method according to any of claims 1 to 5.
7. A reactive voltage control apparatus, comprising:
the system operation short-circuit capacity ratio determining module is configured to calculate a system operation short-circuit capacity ratio according to the ratio of the system operation short-circuit capacity to the rated power of the new energy station;
a coefficient determination module configured to determine a proportional coefficient and an integral coefficient of a proportional-integral controller according to a range in which the system operation short-circuit capacity ratio is located;
a reactive voltage control module configured to perform reactive voltage control using a proportional-integral controller based on the determined proportional coefficient and integral coefficient,
wherein the short-circuit capacity of the system operation is the short-circuit capacity of the system of the new energy station in operation,
wherein the system operational short circuit capacity ratio is an operational short circuit ratio of the system,
wherein the coefficient determination module is further configured to:
in response to the system operation short-circuit capacity ratio being larger than a first preset value, determining a proportional coefficient and an integral coefficient of a proportional-integral controller to be a first proportional coefficient and a first integral coefficient respectively;
in response to the system operation short-circuit capacity ratio being larger than a second preset value and smaller than or equal to a first preset value, determining a proportional coefficient and an integral coefficient of a proportional-integral controller to be a second proportional coefficient and a second integral coefficient respectively;
in response to the system operation short-circuit capacity ratio being greater than a third predetermined value and less than or equal to a second predetermined value, determining the proportional coefficient and the integral coefficient of the proportional-integral controller as a third proportional coefficient and a third integral coefficient, respectively,
wherein the first predetermined value is greater than the second predetermined value, the second predetermined value is greater than the third predetermined value, and the second predetermined value is 3.
8. The reactive voltage control device of claim 7, further comprising:
the detection module is configured to acquire the electric information quantity of the high-voltage side or the low-voltage side of the new energy station;
a calculation module configured to calculate the system operational short circuit capacity based on the amount of electrical information.
9. The reactive voltage control device of claim 7 or 8, wherein the coefficient determination module is further configured to: in response to the system operational short circuit capacity ratio being greater than a predetermined threshold, determining that the system operational short circuit capacity ratio is valid.
10. A computing device, comprising: a computer readable storage medium having stored thereon instructions or code which when executed by the processor implement the reactive voltage control method of any of claims 1 to 5, and a processor.
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| PCT/CN2021/120139 WO2022121446A1 (en) | 2020-12-09 | 2021-09-24 | Control system, reactive voltage control method and device, medium, and calculation device |
| AU2021394197A AU2021394197A1 (en) | 2020-12-09 | 2021-09-24 | Control system, reactive voltage control method and device, medium, and calculation device |
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| CN113922412B (en) * | 2021-09-09 | 2023-10-20 | 国电南瑞科技股份有限公司 | New energy multi-station short-circuit ratio panoramic evaluation method, system, storage medium and computing equipment |
| CN115117891B (en) * | 2022-07-11 | 2023-09-29 | 华能澜沧江水电股份有限公司 | Voltage control method for hydropower plant |
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