AU2021394197A1 - Control system, reactive voltage control method and device, medium, and calculation device - Google Patents
Control system, reactive voltage control method and device, medium, and calculation device Download PDFInfo
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Classifications
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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
-
- 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
-
- 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
-
- 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]
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The present invention provides a control system, a reactive voltage control method and device, a medium, and a calculation device. The reactive voltage control method comprises: determining a system running short circuit capacity ratio according to a system running short circuit capacity and the rated power of a new energy station; determining a proportional coefficient and an integral coefficient of a proportional-integral algorithm according to a range of the system running short circuit capacity ratio; and controlling a reactive voltage by using the proportional-integral algorithm based on the determined proportional coefficient and integral coefficient.
Description
*'~~,~~c:j2022/121446~.1111111liiiIliii111111IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIliii RORSSESI,5KSMTR),OA1N(BEBJCECGCI, CMGAGNGQGWKMMLMRNESNTDTG)O
A LILa Air21~(3))~
[0001] The present disclosure generally relates to the field of new energy, and in particular, to a system for controlling a wind power plant, a method and a device for controlling a reactive voltage, a medium, and a computing device.
[0002] As an increase of a proportion of new energy in energy for electrical power systems, and an increase of capacity of a single unit, installed capacity of a power station increases continuously.
[0003] Development of new-energy power stations has a large scale and a concentrated development mode. Power generation from new energy has an inherent intermittence, and thus connecting a large scale of new energy to a power grid results in great challenges. In addition, regions having grid-connected new energy often lack of support from local load and conventional power supply, and electric power generated from a new-energy power station is transmitted to a load center over a long distance, which results in a significant fluctuation of a reactive voltage on a power transmission channel due to change in electric power generated from new energy. Therefore, a reactive control and voltage stability of the new-energy power station are highly required.
[0004] Although conventional theories and technologies for controlling a voltage and a reactive power are relatively mature, a conventional method for controlling a reactive power considers only a current time section of the power supply system, due to limitation from various factors such as an overall topology of the system and communication. A control logic is triggered only when an actual measured voltage of the system is greater than or close to a threshold, which is essentially a lagging and passive control. For the new-energy power generation, fluctuation of load is significant, and greatly affects a change of the voltage. As a result, a single-step control manner based on an impedance of the system cannot meet requirements for the control. Therefore, a rapid closed-loop control manner is required for a system for controlling a power station, in order to rapidly track any change in the voltage of the system and modify the voltage timely, so as to control the voltage rapidly and accurately to be within a target operating range.
[0005] The above are only presented as background for understanding relevant technical content.
Disclosure of the above content does not mean that the content pertains to prior art.
[0006] An objective of exemplary embodiments of the present disclosure is to provide a method for controlling a reactive voltage and a device for controlling a reactive voltage, with which the reactive voltage can be controlled rapidly.
[0007] According to an aspect of the present disclosure, a method for controlling a reactive voltage is provided. The method for controlling a reactive voltage includes: determining a system operating short-circuit capacity ratio based on a short-circuit capacity of system operation and a rated power of a new-energy power station; determining a proportional coefficient and an integral coefficient for a proportional-integral algorithm, based on a range in which the system operating short-circuit capacity ratio is located; and controlling the reactive voltage by using the proportional-integral algorithm based on the proportional coefficient and the integral coefficient.
[0008] According to another aspect of the present disclosure, a computer-readable storage medium is provided. The computer-readable storage medium stores instructions or codes. The instructions or the codes, when executed by a processor, cause the method for controlling a reactive voltage to be implemented.
[0009] According to another aspect of the present disclosure, a device for controlling a reactive voltage is provided. The device for controlling a reactive voltage includes: a module for determining a system operating short-circuit capacity ratio, configured to calculate a system operating short-circuit capacity ratio based on a short-circuit capacity of system operation and a rated power of a new-energy power station; a coefficient determining module, configured to determine a proportional coefficient and an integral coefficient for a proportional-integral controller based on a range in which the system operating short-circuit capacity ratio is located; and a reactive-voltage control module, configured to control the reactive voltage by using the proportional-integral controller based on the proportional coefficient and the integral coefficient.
[0010] According to another aspect of the present disclosure, a computing device is provided. The computing device includes a computer-readable storage medium and a processor. The computer-readable storage medium stores instructions or codes. The instructions or the codes, when executed by the processor, configure the processor to perform the method for controlling a reactive voltage.
[0011] According to another aspect of the present disclosure, a system for controlling a wind power plant is provided. The system for controlling a wind power plant includes the device for controlling a reactive voltage.
[0012] Other aspects and/or advantages of a general concept of the present disclosure are partially set forth in the following description. Some other aspects and/or advantages are apparent from the description, or can be known from practice of the general concept of the present disclosure.
[0013] The above and other objectives and features of exemplary embodiments of the present disclosure become more apparent from the following description in conjunction with the drawings that exemplarily illustrate the embodiments. In the drawings:
[0014] Figure 1 is a flow chart illustrating a method for controlling a reactive voltage according to a first embodiment of the present disclosure;
[0015] Figure 2 is a flow chart illustrating a method for controlling a reactive voltage according to a second embodiment of the present disclosure;
[0016] Figure 3 is a flow chart illustrating a method for controlling a reactive voltage according to a third embodiment of the present disclosure;
[0017] Figure 4 is a schematic diagram illustrating a simplified equivalent circuit of a power supply system for a new-energy power station;
[0018] Figure 5 is a block diagram illustrating a device for controlling a reactive voltage according to a first embodiment of the present disclosure; and
[0019] Figure 6 is a block diagram illustrating a device for controlling a reactive voltage according to a second embodiment of the present disclosure.
[0020] Reference is made in detail to embodiments of the present disclosure. Examples of the embodiments are illustrated in the drawings. Throughout the drawings, same reference signs refer to a same component. Hereinafter, the embodiments are described with reference to the drawings for explaining the present disclosure.
[0021] According to the embodiments of the present disclosure, a reactive voltage of a power supply system is controlled by using a rapid PI control strategy. The overall control of the reactive voltage has advantages of rapid adjustment speed and high accuracy.
[0022] According to the present disclosure, variability of operating modes of the power supply system is further considered. A real-time short-circuit capacity of system operation is introduced, and a real-time system operating short-circuit capacity ratio for a new-energy power station is calculated based on the real-time short-circuit capacity of system operation. The system operating short-circuit capacity ratio characterizes the strength of the power supply system. PI parameters are classified based on the strength of the power supply system, so as to realize segmented control of the PI parameters.
[0023] During an actual operation of a new-energy power supply system, a significant change in an operating mode is directly reflected through the system operating short-circuit capacity ratio. Therefore, parameters for controlling the reactive voltage of the system can be adjusted in real time based on the system operating short-circuit capacity ratio, so that the PI parameters are modified online. Thereby, a high accuracy and a rapid response of the overall control over a time dimension are ensured, applicability of the control algorithm is improved, and a stability of control of system operation is guaranteed.
[0024] The method and the device for controlling a reactive voltage according to any of the embodiments of the present disclosure may be applied to control a reactive voltage of a new energy power station, such as a wind power plant, which is not limited thereto. Preferred embodiments of the present disclosure are described in detail below in conjunction with the drawings.
[0025] Figure 1 is a flow chart illustrating a method for controlling a reactive voltage according to a first embodiment of the present disclosure. Figure 2 is a flow chart illustrating a method for controlling a reactive voltage according to a second embodiment of the present disclosure. Figure 3 is a flow chart illustrating a method for controlling a reactive voltage according to a third embodiment of the present disclosure. Figure 4 is a schematic diagram illustrating a simplified equivalent circuit of a power supply system for a new-energy power station.
[0026] According to an embodiment of the present disclosure, a method for controlling a reactive voltage includes the following steps SI10, S120 and S130.
[0027] In step SI10, a system operating short-circuit capacity ratio is determined based on a short-circuit capacity of system operation and a rated power of a new-energy power station.
[0028] As described above, a significant change in an operating mode of the power supply system for the new-energy power station results in a change in the system operating short-circuit capacity ratio. Therefore, the system operating short-circuit capacity ratio may reflect the change in the operating mode. A parameter (proportional-integral parameter) for controlling the reactive voltage of the system may be adjusted in real time based on the system operating short-circuit capacity ratio, so that the proportional-integral (PI) parameter (which includes a coefficient or constant of a proportional term and a coefficient or constant of an integral term in a PI algorithm or PI controller, which are referred to as a proportional coefficient and an integral coefficient in the following description) can be modified online.
[0029] The short-circuit capacity of system operation may be calculated based on an electrical quantity on a high-voltage side or a low-voltage side of the new-energy power station. The method for controlling a reactive voltage according to an embodiment of the present disclosure may further include a step of acquiring the electrical quantity on the high-voltage side or the low-voltage side of the new-energy power station, and calculating the short-circuit capacity of system operation based on the electrical quantity. Here, the new-energy power station may be a wind power plant, a photovoltaic station, or a station including at least one of a wind power generator set and a photovoltaic power generating system.
[0030] The electrical quantity on the high-voltage side or the low-voltage side of the new-energy power station may be measured in real time through various sensors.
[0031] The system operating short-circuit capacity ratio maybe acquired from dividing the short circuit capacity of system operation by the rated power of the new-energy power station, which is not limiting.
[0032] Instep S120, the proportional coefficient and the integral coefficient for the proportional integral algorithm are determined based on a range in which the system operating short-circuit capacity ratio is located. In an example, the PI parameter may be set constant (that is, both the proportional coefficient and the integral coefficient remain unchanged) with the system operating short-circuit capacity ratio changes within a certain range.
[0033] In step S130, the reactive voltage is controlled by using the proportional-integral algorithm based on the determined proportional coefficient and the integral coefficient. In an example, the operation of controlling the reactive voltage by using the proportional-integral algorithm based on the determined proportional coefficient and the integral coefficient may include: determining a deviation between a target reactive voltage and an actual reactive voltage as an input to the proportional-integral algorithm to generate a control instruction for a reactive source of the new-energy power station, and transmitting the control instruction to the reactive source, to control the actual reactive voltage to approach to the target reactive voltage.
[0034] Here, the operation of determining the deviation between the target reactive voltage and the actual reactive voltage as the input to the proportional-integral algorithm is merely an example. A deviation between a reactive power and an actual reactive power may be determined as the input to the proportional-integral algorithm. Alternatively, multiple variables may be applied for a joint control.
[0035] It should be noted that the PI algorithm or PI controller in the present disclosure may be considered as a PID algorithm or PID controller, in which a derivative coefficient is zero.
[0036] The operation of acquiring the electrical quantity on the high-voltage side or the low voltage side of the new-energy power station may include: acquiring an electrical quantity at different time instants. In an example, the electrical quantity at a current time instant and the electrical quantity at a previous time instant may be acquired. In this case, the operation of calculating the short-circuit capacity of system operation based on the electrical quantity may include: calculating the short-circuit capacity of system operation Sosc based on the electrical quantity at the current time instant and the electrical quantity at the previous time instant.
[0037] Reference is made to Figure 2. According to an embodiment of the present disclosure, the method for controlling a reactive voltage may include the following steps S210, S220, S230 and S240.
[0038] In step S210, the electrical quantity at the current time instant (a time instant k, for example) and the electrical quantity at the previous time instant (a time instant k-i, for example) are acquired. For example, the electrical quantity may include an active power, a reactive power, and a voltage on the high-voltage side or the low-voltage side of the new-energy power station. That is, the electrical quantity at the current time instant (the time instant k, for example) and the electrical quantity at the previous time instant (the time instant k-i, for example) on the high voltage side or low-voltage side of the new-energy power station may be acquired.
[0039] For example, a typical value of the OSCR may be acquired through tuning or simulation on a certain site, and thus an optimal PI parameter may be acquired through simulation or commissioning in an actual project. The optimal PI parameter here may serve as an initial value or default value.
[0040] In step S220, the short-circuit capacity of system operation is calculated based on the electrical quantity at the current time instant and the electrical quantity at the previous time instant.
[0041] Hereinafter, a method for determining the system operating short-circuit capacity ratio based on the electrical quantity and the rated power of the new-energy power station is described in conjunction with Figure 4.
[0042] Reference is made to Figure 4. An equivalent potential E of the power supply system during operation is calculated as E=Ex+jEy, an equivalent impedance of the power supply system is calculated as Z=R+jX, a voltage amplitude on the high-voltage side of a main transformer in the new-energy power station (such as the wind power plant) is represented by V, the active power is represented by P, the reactive power is represented by Q, and the short-circuit capacity of system operation is represented by Sosc.
[0043] At the time instant k, the equivalent potential of the power supply system is calculated as Ek=Eix+jEy, the equivalent impedance is calculated as Z=Rk+jX, the voltage amplitude on the high-voltage side of the main transformer in the new-energy power station (such as the wind power plant) is represented by Vk, the active power is represented by Pk, the reactive power is represented by Qk, and the short-circuit capacity of system operation is represented by Sosc.
[0044] A current of the power supply system at the time instant k may be calculated based on the active power, the reactive power, and the voltage by using the following equation (1).
P +jQ, E,+ jEky,--V =Vk Rk+jX
[0045] The following equation may be derived from equation (1):
(VkEkx -- PkRk + XrQk -- V2 + (Vk E, - QkRk - PkXk
[0046] That is, the following equation (2) may be acquired:
Vk Ek, -Pk R4 + X4Qk v (2) -kk QkRk - PkJk 0
[0047] At the time instant k-1, the equivalent potential of the power supply system is calculated
as EkJ=E(k_)x+jE(k_)y, the equivalent impedance is calculated as ZI=Rkj_+jX_1, the voltage
amplitude on the high-voltage side of the main transformer is represented by Vkj, the active power
is represented by Pkl, and the reactive power is represented by Qk_-.
[0048] The following equation (3) may be obtained:
(k-1) Ek -1)X- E~ +)~ X) -1 3 - Q(k-1)E Rkl -- Pl)-(k-l) = 0
[0049] According to the operating characteristics of the power supply system, the following
equation is satisfied at the time instant k and the time instant k-1:
[0050] Eky = ER,= E k_1),
Xk = t%~z%1(4) E~kIy
(k-1)
In equation (4), Ek represents a real part of an equivalent potential at the time instant k, (_4)
Ekrepresents an imaginary part of the equivalent potential at the time instant k, E(k-_)x represents
a real part of an equivalent potential at the time instant k-1, and E(kl)y represents an imaginary part
of the equivalent potential at the time instant k-i1; Rkrepresents resistance of the system at the time
instant k, X represents reactance of the system at the time instant k, R_1 represents resistance of
the system at the time instant k-1, and X-_ represents reactance of the system at the time instant k
1. An equation (5) is obtaiend from a combination of the equations (2), (3), and (4), and then E,
Eky, R, andXkmay be solved. The equation (5) is expressed as:
V,' 0 - P- Qk Ek V, 0 V -Q - Pk E 'ik10 (5). (k -1) Rk -(k1) (k
0 V(k -1i) - k -1) - P(k -- ) _ _Y/X 0 V -% ~2
[0051] The following equations can be constructed:
Vk 0 - Pk Q
(k - 1) 0 (k - 1) Q(k - 1)
V|2 0 - Pk Q
0 V - IQ -Pk A (k-1) 0 - P
0 (k -1) - Q(k -1) -0k -)_
Vk Vk k O
0-B * 1 -- - ) (- )k (k -I) (k-I) (kI (kI
0 o - QkI - Pk-I)_
Vk 0 V2 Q
C 0 V, 0 - Pk 0 V2
0 Vk 1) 0 ~- V 0 k -I - P QkI0 Vk2 V 0 (k-I))
- V(k ( (k-1)
k-I ) 0 (k -1) k (k--) 0 _ I)(k-I _1 _$k) V= Qk +V + V
k ( - V kQ (k- ) k k - ((k-1) k k( (k ) k ( -1) k (k-1)
B = VVkl)(Vk-) - VXQkQk1 + Qk1)Pk)
C = (PV P V V 2
D = (- Q k 1 Vk + QVk l)Vk- 2 kJ
[0052] Thereby, it gives:
kx H
E B ky H C| (6). k H
D kH
[0053] From the above, the short-circuit capacity of system operation at the time instant k is obtained as:
E (Ek, + jEk,,) Sk.C = k = . (7). Zk Rk + jXk
[0054] In the calculation, Rk may be equal to zero, as a voltage level of the system is generally high. Therefore, the equation (7) may be rewritten as:
(E+ jE,) Sko=-Zk = Xk (8)
[0055] It should be noted that the fact that Rk may be equal to zero during the calculation due to the high voltage level of the system depends on the characteristics of the system. In practice, a voltage and current on the high-voltage side or the low-voltage side of the new-energy power station may be applied, based on an actual requirement, for calculation of the short-circuit capacity of system operation.
[0056] Control of the reactive voltage is generally realized through control of a voltage of a high voltage bus in the new-energy power station. Therefore, the calculation is preferably about the high-voltage side of the new-energy power station.
[0057] In step S230, a system operating short-circuit capacity ratio is determined based on the short-circuit capacity of system operation and a rated power of the new-energy power station.
[0058] For example, the system operating short-circuit capacity ratio of the new-energy power station at the time instant k is calculated as:
OSCR= Sk)c (9)
P=nxP (10)
[0059] In the above equations, P, represents the rated power of the new-energy power station (such as the wind power plant). In a case that the new-energy power station is a wind power plant, Pdmay represents a rated power of a single wind power generator set, and n represents the number of wind power generator sets in the wind power plant.
[0060] In step S240, a proportional coefficient and an integral coefficient for a proportional integral algorithm are determined based on a range in which the system operating short-circuit capacity ratio is located.
[0061] In step S250, the reactive voltage is controlled by using the proportional-integral algorithm based on the determined proportional coefficient and the integral coefficient. As described above, a deviation between a target reactive voltage and an actual reactive voltage is determined as an input to the proportional-integral algorithm, so that a control instruction for the reactive source of the new-energy power station is generated, and the control instruction is transmitted to the reactive source to control the reactive voltage to approach to the target reactive voltage.
[0062] The operation (that is, the step S240) of determining a proportional coefficient and an integral coefficient for a proportional-integral algorithm based on a range in which the system operating short-circuit capacity ratio is located may include: determining whether the system operating short-circuit capacity ratio is valid.
[0063] For example, the system operating short-circuit capacity ratio is determined valid, in response to the system operating short-circuit capacity ratio being greater than a predetermined threshold (for example, a third predetermined value n3 in the following description). The system operating short-circuit capacity ratio is determined invalid, in response to the system operating short-circuit capacity ratio being less than or equal to the third predetermined value.
[0064] Therefore, the operation (that is, the step S240) of determining a proportional coefficient and an integral coefficient for a proportional-integral algorithm based on a range in which the system operating short-circuit capacity ratio is located may include: determining that the system operating short-circuit capacity ratio is valid, in response to the system operating short-circuit capacity ratio being greater than the predetermined threshold (for example, the third predetermined value n3 in the following description).
[0065] Generally, the system operating short-circuit capacity ratio is greater than the third predetermined value. In some special instances, the PI parameter may be maintained and the reactive voltage may be controlled in other manner.
[0066] The operation (that is, the step S240) of determining a proportional coefficient and an integral coefficient for a proportional-integral algorithm based on a range in which the system operating short-circuit capacity ratio is located may include or further include: determining different proportional coefficients and different integral coefficients for different ranges, respectively, in which the system operating short-circuit capacity ratio is located.
[0067] The PI parameter may be set constant (that is, both the proportional coefficient and the integral coefficient remain unchanged) with the system operating short-circuit capacity ratio changes within a certain range. In a case that the system operating short-circuit capacity ratio changes within another range, the PI parameter may be set to another control parameter.
[0068] Figure 3 is a flowchart illustrating a segmented control of a PI parameter based on a range in which a system operating short-circuit capacity ratio is located. The operation (that is, the step S240) of determining a proportional coefficient and an integral coefficient for a proportional integral algorithm based on a range in which the system operating short-circuit capacity ratio is located may include the following steps S2401, S2402, S2403 and S2404.
[0069] Reference is made to Figure 3. In step S2401, it may be determined whether the system operating short-circuit capacity ratio (OSCR) is greater than a first predetermined value (n1). In a case that the OSCR is greater than the first predetermined value, a first set of PI parameters (also known as PI control parameters) may be set. Here, nl may be greater than or equal to 5, and may be adjusted based on an engineering application. Preferably, nl is equal to 5 based on a practical engineering application.
[0070] Specifically, in a case that the system operating short-circuit capacity ratio is greater than the first predetermined value (n1), the proportional coefficient and the integral coefficient for the proportional-integral algorithm may be determined to be a first proportional coefficient and a first integral coefficient, respectively. In other words, with the system operating short-circuit capacity ratio changes within a range greater than the first predetermined value, the proportional coefficient may be fixedly set to thefirst proportional coefficient, and the integral coefficient may be fixed set to thefirst integral coefficient.
[0071] Instep S2402, a second set of PI parameters maybe set in a case of n>OSCR>n2 (where n2 represents a second predetermined value). Here, there has nl>n2>3, which may be adjusted based on an engineering application. Preferably, n2 is equal to 3 based on a practical engineering application.
[0072] Specifically, in a case that the system operating short-circuit capacity ratio is greater than the second predetermined value (n2) and less than or equal to the first predetermined value (n1), the proportional coefficient and the integral coefficient for the proportional-integral algorithm may be determined to be a second proportional coefficient and a second integral coefficient, respectively.
[0073] In other words, with the system operating short-circuit capacity ratio changes within a range that is greater than the second predetermined value and less than or equal to the first predetermined value, the proportional coefficient may be fixedly set to the second proportional coefficient, and the integral coefficient may be fixed set to the second integral coefficient.
[0074] In step S2403, a third set of PI parameters may be set in a case of n2>OSCR>n3 (where n3 represents a third predetermined value). Here, n3 may be greater than or equal to 2, and may be adjusted based on an engineering application. Preferably, n3 is equal to 2 based on a practical engineering application.
[0075] In a case that the system operating short-circuit capacity ratio is greater than the third predetermined value (n3) and less than or equal to the second predetermined value (n2), the proportional coefficient and the integral coefficient for the proportional-integral algorithm may be determined to be a third proportional coefficient and a third integral coefficient, respectively.
[0076] In other words, with the system operating short-circuit capacity ratio changes within a range greater than the third predetermined value and less than or equal to the second predetermined value, the proportional coefficient may be fixed set to the third proportional coefficient, and the integral coefficient may be fixed set to the third integral coefficient.
[0077] The first proportional coefficient, the second proportional coefficient, the third proportional coefficient, the first integral coefficient, the second integral coefficient, and the third integral coefficient may be optimal PI parameters for the OSCR in corresponding ranges, and may be pre-determined.
[0078] In step S2404, the PI parameter may vary in a case that the system operating short-circuit capacity ratio is less than or equal to the third predetermined value n3
[0079] In step S250, the reactive voltage is controlled by using the proportional-integral algorithm based on the determined proportional coefficient and the integral coefficient. In an example, a deviation between a target reactive voltage and an actual reactive voltage is determined as an input to the proportional-integral algorithm, so that a control instruction for the reactive source of the new-energy power station is generated, and the control instruction is transmitted to the reactive source to control the reactive voltage to approach to the target reactive voltage.
[0080] With the method and the device for controlling a reactive voltage according to the embodiments of the present disclosure, segmented adjustment or control of the proportional integral (PI) parameters can be realized based on the range in which the system operating short circuit capacity ratio (OSCR) is located. Thereby, the real-time adjustment of the PI parameters is realized, and a control accuracy and an adjustment speed of the reactive voltage are improved.
[0081] Conventionally, a reactive voltage is controlled mainly in a fixed manner, that is, a constant parameter for control of the system cannot be modified in real time with a change in an operating mode of the system. In such case, as the operating mode of the system changes, a change of the operating mode of the system cannot be sensed timely by a system for controlling a reactive voltage having the constant parameter. As a result, a good effect of control of the reactive voltage can achieved for the new-energy power station at a current time section, but the overall effect is degraded with a change in the operating mode of the system. Further, a greater change in the operating mode of the system results in a more degraded overall control effect. The change in the operating mode is common for the system, and thus the control is difficult to meet a control requirement over an entire time dimension. Therefore, processes and effects of controlling the reactive voltage cannot achieve an expected effect, and a qualified rate of the voltage control cannot be improved.
[0082] In the method for controlling a reactive voltage according to the embodiments of the present disclosure, the PI parameter may be adjusted online in real time. Therefore, the control speed, control accuracy, and the control effect are better than those of the conventional method for controlling a reactive voltage in a fixed manner.
[0083] Figure 5 is a block diagram illustrating a device for controlling a reactive voltage according to a first embodiment of the present disclosure. Figure 6 is a block diagram illustrating a device for controlling a reactive voltage according to a second embodiment of the present disclosure.
[0084] According to an embodiment of the present disclosure, a device 400 for controlling a reactive voltage may include a module 410 for determining a system operating short-circuit capacity ratio, a coefficient determining module 420, and a module 430 for controlling a reactive voltage. The device 400 for controlling a reactive voltage may further include a detecting module 401 and a calculating module 402.
[0085] The module 410 for determining a system operating short-circuit capacity ratio may be configured to calculate a system operating short-circuit capacity ratio based on a short-circuit capacity of system operation and a rated power of a new-energy power station. The calculation of the short-circuit capacity of system operation and the system operating short-circuit capacity ratio may be as described above, and is not repeated here. In addition, it should be noted that the above mentioned calculation of the short-circuit capacity of system operation and the system operating short-circuit capacity ratio is merely an example, and the present disclosure is not limited thereto.
[0086] The coefficient determining module 420 may be configured to determine whether the system operating short-circuit capacity ratio is valid. In a case that the system operating short circuit capacity ratio is valid, a segmented control is applied to control the reactive voltage. In a case that the system operating short-circuit capacity ratio is invalid, the PI parameter is maintained or another control strategy is adopted.
[0087] The coefficient determining module 420 may be configured to 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.
[0088] The coefficient determining module 420 may be configured to determine a proportional coefficient and an integral coefficient for a proportional-integral algorithm based on a range in which the system operating short-circuit capacity ratio is located. In an example, the coefficient determining module 420 may determine different proportional coefficients and different integral coefficients for different ranges, respectively, in which the system operating short-circuit capacity ratio is located, and maintain the PI parameter unchanged in response to the system operating short-circuit capacity ratio changing within a certain continuous range.
[0089] An electrical quantity may be detected in real time, or received from another module.
[0090] In an embodiment, the device 400 for controlling a reactive voltage may further include a detecting module 401 and a calculating module 402. The detecting module 401 may be configured to acquire an electrical quantity on a high-voltage side or a low-voltage side of the new-energy power station. The calculating module 402 may be configured to calculate the short circuit capacity of system operation based on the electrical quantity. The detecting module 401 may include various sensors. The calculating module 402, the coefficient determining module 420, and the module 410 for determining a system operating short-circuit capacity ratio may be implemented by software and/or hardware.
[0091] In an embodiment, the detecting module 401 may be configured to acquire the electrical quantity at a current time instant (such as a time instant k) and the electrical quantity at a previous time instant (such as a time instant k-). The calculating module 402 may be configured to calculate the short-circuit capacity of system operation based on the acquired electrical quantity at the current time instant and the electrical quantity at the previous time instant.
[0092] Specific calculation is as described above. The short-circuit capacity of system operation and the system operating short-circuit capacity ratio may be calculated based on an active power, a reactive power, a voltage, and other electrical quantities on the high-voltage side or the low voltage side of the new-energy power station.
[0093] The coefficient determining module 420 may be configured to determine the proportional coefficient and the integral coefficient for the proportional-integral algorithm to be a first proportional coefficient and a first integral coefficient, respectively, in a case that the system operating short-circuit capacity ratio is greater than a first predetermined value. That is, in a case that the OSCR is greater than thefirst predetermined value, the coefficient determining module 420 may adopt a first set of PI parameters. In other words, with the system operating short-circuit capacity ratio changes within a range greater than the first predetermined value, the coefficient determining module 420 may fixedly set the proportional coefficient to the first proportional coefficient, and fixedly set the integral coefficient to the first integral coefficient.
[0094] The coefficient determining module 420 may be configured to determine the proportional coefficient and the integral coefficient for the proportional-integral algorithm to be a second proportional coefficient and a second integral coefficient, respectively, in a case that the system operating short-circuit capacity ratio is greater than a second predetermined value and less than or equal to the first predetermined value.
[0095] Ina case of n>OSCR>n2 (n2 represents the second predetermined value), the coefficient determining module 420 may adopt a second set of PI parameters. That is, with the system operating short-circuit capacity ratio changes within a range greater than the second predetermined value and less than or equal to the first predetermined value, the coefficient determining module 420 may fixedly set the proportional coefficient to the second proportional coefficient, and fixed set the integral coefficient to the second integral coefficient.
[0096] The coefficient determining module 420 may be configured to determine the proportional coefficient and the integral coefficient for the proportional-integral controller to be a third proportional coefficient and a third integral coefficient, respectively, in response to the system operating short-circuit capacity ratio being greater than a third predetermined value and less than or equal to the second predetermined value.
[0097] In a case of n2>OSCR>n3 (the third predetermined value), the coefficient determining module 420 may adopt a third set of PI parameters. That is, with the system operating short-circuit capacity ratio changes within a range greater than the third predetermined value and less than or equal to the second predetermined value, the coefficient determining module 420 may fixedly set the proportional coefficient to the third proportional coefficient, and fixedly set the integral coefficient to the third integral coefficient.
[0098] The module 430 for controlling a reactive voltage may be configured to control the reactive voltage by using a proportional-integral controller based on the determined proportional coefficient and the integral coefficient. The proportional-integral controller here is a part of the module 430 for controlling a reactive voltage.
[0099] In an example, the module 430 for controlling a reactive voltage may be configured to determine a deviation between a target reactive voltage and an actual reactive voltage as an input to the proportional-integral algorithm to generate a control instruction for a reactive source of the new-energy power station, and transmit the control instruction to the reactive source to control the reactive voltage to approach to the target reactive voltage.
[0100] The operations in the above steps may be written as a software program or instructions. Therefore, the method according to the exemplary embodiments of the present disclosure may be implemented by software. A computer-readable storage medium according to an exemplary embodiment of the present disclosure may store a computer program. The computer program, when executed by a processor, performs the method for controlling a reactive voltage as described in the exemplary embodiments.
[0101] According to the embodiments of the present disclosure, the device (such as modules or functions) or the method may be implemented by the program or the instructions stored in the computer-readable storage medium. The instructions, when executed by the processor, cause the processor to perform functions or the method corresponding to the instructions. At least part of functions of the module may be implemented (for example, executed) by the processor. At least part of a programming module may include a module, a program, a routine, an instruction set, and a procedure for executing at least one function. In an example, instructions or software include machine codes (for example, machine codes generated by a compiler) directly executed by one or more processors or computers. In another example, instructions or software include higher-level codes executed by one or more processors or computers using an interpreter. The instructions or the software may be written using any programming language based on the block diagrams and flow charts shown in the drawings, as well as the corresponding descriptions in the specification.
[0102] The computer-readable storage medium includes a magnetic medium such as a floppy disk and a magnetic tape, an optical medium (including an optical disk (CD) ROM and DVD ROM), a magnetic optical medium such as a floptical disk, a hardware device designed to store and execute program instructions such as ROM, RAM, and a flash memory. The program instructions include language codes executable by a computer using an interpreter and machine language codes generated by a compiler. The hardware device may be implemented through one or more software modules for performing the operations of the embodiments of the present disclosure.
[0103] The modules or programming modules in the present disclosure may include at least one of the foregoing components with some components omitted or other components added. The operations of the modules, the programming modules, or other components may be executed sequentially, in parallel, cyclically, or tentatively. In addition, some operations may be executed in different orders, may be omitted, or extended with other operations.
[0104] The computer-readable storage medium and/or the device for controlling a reactive voltage according to the exemplary embodiments of the present disclosure may be a computing device, a controller, or a part of a control system.
[0105] For example, a computing device is provided according to an exemplary embodiment of the present disclosure. The computing device may include a processor (not shown) and a memory (not shown, and may be a computer-readable storage medium). The memory stores a computer program (codes or instructions). The computer program, when executed by the processor, performs the method for controlling a reactive voltage according to the foregoing exemplary embodiments.
[0106] A system for controlling a wind power plant (not shown) is further provided according to an embodiment of the present disclosure. The system for controlling a wind power plant includes the device for controlling a reactive voltage. Specifically, the system for controlling a wind power plant is an automatic voltage control (AVC) system or a voltage/var management platform (VMP) for the wind power plant.
[0107] With the method for controlling a reactive voltage and the device for controlling a reactive voltage according to the embodiments of the present disclosure, the PI parameter can be adjusted online in real time. Therefore, the control speed and control accuracy of the control of a reactive voltage are improved.
[0108] Although some exemplary embodiments of the present disclosure are shown and described, those skilled in the art should understand that modifications can be made to the embodiments without departing from the principle and spirit of the present disclosure whose scope is defined by the claims and equivalents thereof. For example, technical features of different embodiments may be combined with each other.
Claims (15)
1. A method for controlling a reactive voltage, comprising:
determining a system operating short-circuit capacity ratio, based on a short-circuit capacity of system operation and a rated power of a new-energy power station;
determining a proportional coefficient and an integral coefficient for a proportional-integral algorithm, based on a range in which the system operating short-circuit capacity ratio is located; and
controlling the reactive voltage by using the proportional-integral algorithm based on the proportional coefficient and the integral coefficient.
2. The method according to claim 1, further comprising:
acquiring an electrical quantity on a high-voltage side or a low-voltage side of the new-energy power station; and
calculating the short-circuit capacity of system operation based on the electrical quantity.
3. The method according to claim 2, wherein:
the acquiring an electrical quantity on a high-voltage side or a low-voltage side of the new energy power station comprises:
acquiring the electrical quantity at a current time instant and the electrical quantity at a previous time instant on the high-voltage side or the low-voltage side of the new-energy power station, wherein the electrical quantity comprises an active power, a reactive power, and a voltage; and
the calculating the short-circuit capacity of system operation based on the electrical quantity comprises:
calculating the short-circuit capacity of system operation based on the electrical quantity at the current time instant and the electrical quantity at the previous time instant.
4. The method according to any one of claims I to 3, wherein the determining a proportional coefficient and an integral coefficient for a proportional-integral algorithm, based on a range in which the system operating short-circuit capacity ratio is located comprises:
determining 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.
5. The method according to claim 4, wherein the determining a proportional coefficient and an integral coefficient for a proportional-integral algorithm, based on a range in which the system operating short-circuit capacity ratio is located comprises:
determining different proportional coefficients and different integral coefficients for different ranges, respectively, in which the system operating short-circuit capacity ratio is located.
6. The method according to claim 5, wherein:
the proportional coefficient and the integral coefficient for the proportional-integral algorithm are determined to be a first proportional coefficient and a first integral coefficient, respectively, in a case that the system operating short-circuit capacity ratio is greater than a first predetermined value;
the proportional coefficient and the integral coefficient for the proportional-integral algorithm are determined to be a second proportional coefficient and a second integral coefficient, respectively, in a case that the system operating short-circuit capacity ratio is greater than a second predetermined value and less than or equal to the first predetermined value; and
the proportional coefficient and the integral coefficient for the proportional-integral algorithm are determined to be a third proportional coefficient and a third integral coefficient, respectively, in a case that the system operating short-circuit capacity ratio is greater than a third predetermined value and less than or equal to the second predetermined value.
7. The method according to claim 1, wherein the controlling the reactive voltage by using the proportional-integral algorithm based on the proportional coefficient and the integral coefficient comprises:
determining a deviation between a target reactive voltage and an actual reactive voltage as an input to the proportional-integral algorithm to generate a control instruction for a reactive source of the new-energy power station, and transmitting the control instruction to the reactive source, to control the actual reactive voltage to approach to the target reactive voltage.
8. A computer-readable storage medium, storing instructions or codes, wherein:
the instructions or codes, when executed by a processor, implement the method according to any one of claims I to 7.
9. A device for controlling a reactive voltage, comprising:
a module for determining a system operating short-circuit capacity ratio, configured to calculate a system operating short-circuit capacity ratio based on a short-circuit capacity of system operation and a rated power of a new-energy power station; a coefficient determining module, configured to determine a proportional coefficient and an integral coefficient for a proportional-integral controller based on a range in which the system operating short-circuit capacity ratio is located; and a reactive-voltage control module, configured to control the reactive voltage by using the proportional-integral controller based on the proportional coefficient and the integral coefficient.
10. The device according to claim 9, further comprising:
a detecting module, configured to acquire an electrical quantity on a high-voltage side or a low-voltage side of the new-energy power station; and
a calculating module, configured to calculate the short-circuit capacity of system operation based on the electrical quantity.
11. The device according to claim 9 or 10, wherein the coefficient determining module is further configured to:
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.
12. The device according to claim 11, wherein the coefficient determining module is further configured to:
determine the proportional coefficient and the integral coefficient for the proportional integral controller to be a first proportional coefficient and a first integral coefficient, respectively, in a case that the system operating short-circuit capacity ratio is greater than afirst predetermined value;
determine the proportional coefficient and the integral coefficient for the proportional integral controller to be a second proportional coefficient and a second integral coefficient, respectively, in a case that the system operating short-circuit capacity ratio is greater than a second predetermined value and less than or equal to the first predetermined value; and
determine the proportional coefficient and the integral coefficient for the proportional integral controller to be a third proportional coefficient and a third integral coefficient, respectively, in a case that the system operating short-circuit capacity ratio is greater than a third predetermined value and less than or equal to the second predetermined value.
13. A computing device, comprising:
a processor; and
a computer-readable storage medium, storing instructions or codes; wherein
the instructions or the codes, when executed by the processor, configure the processor to perform the method for controlling a reactive voltage according to any one of claims 1 to 7.
14. A system for controlling a wind power plant, comprising the device according to any one of claims 9 to 12.
15. The system according to claim 14, wherein the system is an automatic voltage control system or a voltage/var management platform for the wind power plant.
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| CN202011447722.3 | 2020-12-09 | ||
| CN202011447722.3A CN113315164B (en) | 2020-12-09 | 2020-12-09 | Reactive voltage control method and device, medium and computing device |
| PCT/CN2021/120139 WO2022121446A1 (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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| CN103346577B (en) * | 2013-07-11 | 2016-06-15 | 国家电网公司 | Reduce wind energy turbine set AVC powerless control system and the method for wind power loss |
| CN104779644B (en) * | 2015-05-06 | 2017-03-22 | 北京天源科创风电技术有限责任公司 | Wind power plant grid connection stability assessment method |
| US11619206B2 (en) * | 2016-06-21 | 2023-04-04 | General Electric Company | System and method for controlling a power generating unit |
| CN108183490B (en) * | 2016-12-08 | 2020-11-10 | 北京金风科创风电设备有限公司 | Control gain adjustment method, device and system for reactive compensation device |
| JP6969152B2 (en) * | 2017-05-12 | 2021-11-24 | 富士電機株式会社 | Control device and static VAR compensator |
| CN107658890B (en) * | 2017-10-20 | 2019-09-10 | 国网湖南省电力公司 | Substation mixes the determination of STATCOM reference voltage and control method of reactive compensation system |
| CN110970915B (en) * | 2018-09-28 | 2022-07-08 | 北京金风科创风电设备有限公司 | Control method and device for grid-connected voltage of wind generating set |
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| CN113315164B (en) * | 2020-12-09 | 2023-03-03 | 北京金风科创风电设备有限公司 | Reactive voltage control method and device, medium and computing device |
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