LU102141B1 - Method and system for determining parameter of wide area damping controller of electric power system - Google Patents
Method and system for determining parameter of wide area damping controller of electric power system Download PDFInfo
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- LU102141B1 LU102141B1 LU102141A LU102141A LU102141B1 LU 102141 B1 LU102141 B1 LU 102141B1 LU 102141 A LU102141 A LU 102141A LU 102141 A LU102141 A LU 102141A LU 102141 B1 LU102141 B1 LU 102141B1
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Abstract
An embodiment of the present invention provides a method and system for determining a parameter of a wide area damping controller of an electric power system. The method includes the following steps: determine a first value of a damping performance parameter within a preset value range of the damping performance parameter and a second value of a time-lag margin parameter of a preset value range of the time-lag margin parameter of the electric power system, respectively, so as to minimize a value of a performance index function of the wide area damping controller of the electric power system and determine a weight coefficient of the time-lag margin parameter of the electric power system in the performance index function when a value of the performance index function is minimum; and if it is determined and recognized that the weight coefficient is within a given value range, determine a gain parameter of the wide area damping controller of the electric power system according to the first value and the second value. Since the method provided in an embodiment of the present invention considers the time-lag margin parameter and the damping performance parameter of an influencing factor of the parameter of the wide area damping controller of the electric power system simultaneously, the gain parameter of the wide area damping controller of the electric power system is more accurately determined.
Description
Description
[0001] An embodiment of the present invention relates to the technical field of the control of an electric power system, and more specifically, to a method and system for determining a parameter of a wide area damping controller of the electric power system
[0002] At present, as the scale of a power grid becomes increasingly larger, the interconnection of inter-regional power grids has become a trend. A low-frequency oscillation phenomenon of an inter-regional interconnection system caused by this affects the power transmission capacity of a connection line. Especially, a phenomenon of a constant amplitude interval low-frequency oscillation without attenuation seriously affects the transmission efficiency of interval power and the stability of the interconnection system, and may even cause the system to disassemble or even collapse. Therefore, improving the damping of the interval low-frequency oscillation of the system becomes one of the methods of improving the stability and robustness of the interconnection system. Low-frequency oscillation can be suppressed by installing a Power System Stabilization (PSS), but the traditional damping controller generally uses local signals as feedback quantity, which has a better suppression effect on a local oscillation mode, but does not have an ideal effect on an interval oscillation mode.
[0003] With the development of the Wide area Measurement System (WAMS), it is possible to use remote feedback signals. The use of the remote feedback signals can effectively suppress low-frequency oscillation in a damping interval, but resulting transmission time delay of the remote feedback signals has become a main reason that affects the effect of the controller and even the stability of the system. The design of a wide area damping controller that considers the transmission time delay of the signals is becoming more and more urgent. Moreover, the use of the wide area damping controller has different effects on the damping of the entire power system. Improper selection of a parameter of the controller not only cannot improve the 1 damping of the system, but may worsen the damping of the electric power system. LU102141 Therefore, the selection of the parameter of the wide area damping controller is a very important research issue.
[0004] However, a method for selecting the parameter of the wide area damping controller provided in the prior art only considers a certain influencing factor of the parameter of the controller for selection, and does not consider a mutual restriction relationship of various influencing factors of the parameter of the wide area damping controller. Therefore, the determined parameter of the wide area damping controller is not necessarily a parameter of ensuring the performance of the wide area damping controller to be good. Therefore, there is an urgent need to provide a method for determining the parameter of the wide area damping controller of the electric power system, so that the obtained wide area damping controller of the electric power system has good performance.
[0005] In order to solve the above-mentioned problems or at least partially solve the above-mentioned problems, an embodiment of the present invention provide a method and system for determining a parameter of a wide-area damping controller of an electric power system.
[0006] In a first aspect, an embodiment of the present invention provides a method for determining a parameter of a wide area damping controller of an electric power system, comprising:
[0007] S1: determine a first value of a damping performance parameter within a preset value range of the damping performance parameter and a second value of a time-lag margin parameter of a preset value range of the time-lag margin parameter of the electric power system, respectively, so as to minimize a value of a performance index function of the wide area damping controller of the electric power system and determine a weight coefficient of the time-lag margin parameter of the electric power system in the performance index function when a value of the performance index function is minimum;
[0008] S2: if it is determined and recognized that the weight coefficient is within a given value range, determine a gain parameter of the wide area damping controller of the electric power system according to the first value and the second value; 2
[0009] The performance index function is configured to characterize the capacity of LU102141 the wide area damping controller of the electric power system of balancing the damping performance parameter of the electric power system and the time-lag margin parameter of the electric power system.
[0010] In a second aspect, an embodiment of the present invention provides An electric power system for determining a parameter of a wide area damping controller, comprising:
[0011] A weight coefficient determination module, configured to determine a first value of a damping performance parameter within a preset value range of the damping performance parameter and a second value of a time-lag margin parameter of a preset value range of the time-lag margin parameter of the electric power system, respectively, so as to minimize a value of a performance index function of the wide area damping controller of the electric power system and determine a weight coefficient of the time-lag margin parameter of the electric power system in the performance index function when a value of the performance index function is minimum.
[0012] A gain parameter determination module, configured to determine a gain parameter of the wide area damping controller of the electric power system according to the first value and the second value if it is determined and recognized that the weight coefficient is within a given value range.
[0013] The performance index function is configured to characterize the capacity of the wide area damping controller of the electric power system of balancing the damping performance parameter of the electric power system and the time-lag margin parameter of the electric power system.
[0014] In a third aspect, an embodiment of the present invention provides an electronic apparatus, comprising:
[0015] At least one processor, at least one memory, a communication interface and a bus, wherein,
[0016] The processor, the memory, and the communication interface communicate with each other through the bus.
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[0017] The memory stores program instructions executable by the processor, and the processor calls the program instructions to execute a method for determining a parameter of a wide area damping controller of an electric power system provided by a first aspect.
[0018] In a fourth aspect, an embodiment of the present invention provide A non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer instructions that cause a computer to execute a method for determining a parameter of a wide area damping controller of an electric power system provided by a first aspect.
[0019] An embodiment of the present invention provides the method and system for determining the parameter of the wide area damping controller of the electric power system. The method comprises the following steps: determine the first value of the damping performance parameter within the preset value range of the damping performance parameter and the second value of the time-lag margin parameter of the preset value range of the time-lag margin parameter of the electric power system, respectively, so as to minimize the value of the performance index function of the wide area damping controller of the electric power system and determine the weight coefficient of the time-lag margin parameter of the electric power system in the performance index function when the value of the performance index function is minimum; and if it is determined and recognized that the weight coefficient is within the given value range, determine the gain parameter of the wide area damping controller of the electric power system according to the first value and the second value. Since the method provided in an embodiment of the present invention considers the time-lag margin parameter and the damping performance parameter of the influencing factor of the parameter of the wide area damping controller of the electric power system simultaneously, the gain parameter of the wide area damping controller of the electric power system is more accurately determined. Moreover, a wide area damping controller model of the electric power system determined by the gain parameter of the wide area damping controller of the electric power system is more stable.
[0020] In order to explain an embodiment of the present invention or the technical solution in the prior art more clearly, the drawings that need to be used in the description of an embodiment or the prior art will be briefly introduced in the 4 following. Obviously, the drawings in the following description are a plurality of LU102141 embodiments of the present invention. The person skilled in the art can obtain other drawings based on these drawings without creative work.
[0021] FIG. 1 is a schematic flowchart of a method for determining a parameter of a wide area damping controller of an electric power system provided by an embodiment of the present invention;
[0022] FIG. 2 is a comparison schematic diagram of an active power oscillation curve of an electric power system controlled and obtained by a controller model constructed by a parameter determined by a method for determining a parameter of a wide area damping controller of an electric power system provided by an embodiment of the present invention and an active power oscillation curve of an electric power system obtained by a controller model in the prior art;
[0023] FIG. 3 is a comparison schematic diagram of a rotor angle oscillation curve of an electric power system controlled and obtained by a controller model constructed by a parameter determined by a method for determining a parameter of a wide area damping controller of an electric power system provided by an embodiment of the present invention and a rotor angle oscillation curve of an electric power system obtained by a controller model in the prior art;
[0024] FIG. 4 is a schematic structural diagram of a system for determining a parameter of a wide area damping controller of an electric power system provided by an embodiment of the present invention;
[0025] FIG. 5 is a schematic structural diagram of an electronic apparatus according to an embodiment of the present invention.
[0026] In order to make the objectives, technical solutions, and advantages of embodiments of the present invention clearer, the technical solutions in embodiments of the present invention will be described clearly and completely in conjunction with the drawings in embodiments of the present invention. Obviously, embodiments of the description are a part of embodiments of the present invention, but not all of embodiments. Based on embodiments of the present invention, all other embodiments obtained by the person skilled in the art without creative work shall fall within the protection scope of the present invention. LU102141
[0027] In the description of embodiments of the present invention, it should be noted that the orientation or positional relationship of terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outside" and other indications is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing embodiments of the present invention and simplifying the description, does not indicate or imply that a device or element referred to has a specific orientation and is constructed and operated with has a specific orientation and hence cannot be understood as a limitation to an embodiment of the present invention. In addition, the terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0028] In the description of embodiments of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "interconnected", and "connected" should be understood in a broad sense. For example, these terms may be fixed connections, also be a detachable connection or an integral connection. The terms may be a mechanical connection or an electrical connection. The terms may be a direct connection or an indirect connection through an intermediate medium. The terms may be an internal communication between two elements. For the person skilled in the art, the specific meanings of the above-mentioned terms in embodiments of the present invention can be understood in specific situations.
[0029] Since a method for selecting a parameter of a wide area damping controller provided in the prior art only considers a certain influencing factor of the controller parameter for selection, that is, the effect of only a damping performance parameter or only a time-lag margin parameter on the parameter of the controller is considered. The mutual restriction relationship among the various influencing factors of the parameter of the wide area damping controller is not taken into account Therefore, the determined parameter of the wide area damping controller is not necessarily a parameter of ensuring the performance of the wide area damping controller to be good. Therefore, a method for determining a parameter of a wide area damping controller of an electric power system provided in embodiments of the present invention comprehensively considers the mutual restriction relationship among various influencing factors of the parameter of the wide area damping controller, so that the wide area damping controller of the electric power system constructed by 6 the obtained parameter of the controller has good performance. LU102141
[0030] As shown in FIG. 1, an embodiment of the present invention provides a method for determining a parameter of a wide area damping controller of an electric power system, comprising:
[0031] S1: determine a first value of a damping performance parameter within a preset value range of the damping performance parameter and a second value of a time-lag margin parameter of a preset value range of the time-lag margin parameter of the electric power system, respectively, so as to minimize a value of a performance index function of the wide area damping controller of the electric power system and determine a weight coefficient of the time-lag margin parameter of the electric power system in the performance index function when a value of the performance index function is minimum;
[0032] S2: if it is determined and recognized that the weight coefficient is within a given value range, determine a gain parameter of the wide area damping controller of the electric power system according to the first value and the second value;
[0033] The performance index function is configured to characterize the capacity of the wide area damping controller of the electric power system of balancing the damping performance parameter of the electric power system and the time-lag margin parameter of the electric power system.
[0034] Specifically, when studying the electric power system, it is necessary to improve the damping performance of the electric power system to suppress the low-frequency oscillation of the electric power system, thereby ensuring the stability of the electric power system. However, due to communication latency in the electric power system, when the damping performance of the electric power system is improved, it is also necessary to consider the restriction effect of the time-lag margin of the electric power system on the damping performance. The damping performance is reflected by the damping performance parameter, and the time-lag margin is reflected by the time-lag margin parameter. In an embodiment of the present invention, an appropriate value of the gain parameter of the wide area damping controller of the electric power system is determined by considering the mutual restriction relationship between the damping performance parameter and the time-lag margin parameter.
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[0035] In an embodiment of the present invention, it is first necessary to determine LU102141 the preset value range of the damping performance parameter and the preset value range of the time-lag margin parameter of the wide area damping controller of the electric power system, and determine the first value of the damping performance parameter from the preset value range of the damping performance parameter and the second value of the time-lag margin parameter from the preset value range of the time-lag margin parameter at the same time, so as to minimize the value of the performance index function of the wide area damping controller of the electric power system and determine the weight coefficient of the time-lag margin parameter of the electric power system in the performance index function.
[0036] It should be noted that the performance index parameter is configured to characterize the capacity of the wide area damping controller of the electric power system of balancing the damping performance parameter of the electric power system and the time-lag margin parameter of the electric power system, that is, the capacity of balancing the damping performance and the time-lag margin of the electric power system. If a value of the weight coefficient of the time-lag margin parameter in the performance index parameter is larger, a value of the weight coefficient of the damping performance parameter is smaller, indicating that the electric power system pays more attention to the time-lag margin parameter than the damping performance parameter. Conversely, if the value of the weight coefficient of the time-lag margin parameter in the performance index parameter is smaller, the value of the weight coefficient of the damping performance parameter is larger, indicating that the electric power system pays less attention to the time-lag margin parameter than the damping performance parameter.
[0037] After determining the weight coefficient of the time-lag margin parameter, it is determined whether the weight coefficient of the time-lag margin parameter is within a given value range. If the weight coefficient of the time-lag margin parameter is within the given value range, the gain parameter of the wide area damping controller of the electric power system is determined according to the determined first value and the determined second value that minimize the value of the performance index function of the wide area damping controller of the electric power system. The gain parameter of the wide area damping controller of the electric power system here is the parameter of the wide area damping controller of the electric power system parameter that needs to be determined in an embodiment of the present invention.
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[0038] A transfer function of a wide area damping controller model of the electric LU102141 power system is shown in Formula (1): Hoel Kine TE # + RD à
[0039] Ci
[0040] Hwaoc (s) is the transfer function. s is an Laplacian operator. Kwapc is the gain parameter of the wide area damping controller of the electric power system, which represents a gain link of the electric power system. Tw is a time constant, which is usually a value of 5s-10s, and represents a blocking link of the electric power system. (Late T1 and T are phase compensation parameters. 1+ Hs; represents an advancing-lag compensation link of the electric power system.
[0041] The function of the advancing-lag compensation link is to compensate the time-lag of wide area signals, so that compensation signals are as same as the original signals as much as possible. If the time-lag causes an lag angle Diag to be between 0° and 80°, parameters of the advancing and lag compensation links satisfy Kw> 0 and ¢w> 0; if the lag angle ¢ 12g is between 80° and 180°, the parameter of the advancing-lag compensation link satisfies Kw <0 and dw <0.
[0042] For a phase compensation part, it is supposed that Qi represents the residual quantity of the transfer function of a k-th modality. A phase quantity dx of the k-th modality needed to be compensated is as follows:
[0043] HF T-argQ u (2)
[0044] The parameters of the advancing and lag compensation links are calculated as follows: Persia / 23 {39
[0045] i SE re Tr ws ef
[0046] so
[0047] Where w=2nfy, fr represents the frequency in the k-th modality. 9
[0048] It can be seen from Formula (1) that when designing the wide area damping controller model of the electric power system, three parts need to be considered: a gain link, the blocking link and the advancing-lag compensation link. The gain link is determined by the gain parameter of the wide area damping controller of the electric power system. Therefore, after the gain parameter of the wide area damping controller of the electric power system is determined, the wide area damping controller model of the electric power system can be determined by further combining the blocking link with the advancing-lag compensation link. At this time, the determined stability performance of the wide area damping controller model of the electric power system determined is better.
[0049] It should be noted that the damping performance parameter described in an embodiment of the present invention refers to a damping ratio.
[0050] An embodiment of the present invention provides the method for determining the parameter of the wide area damping controller of the electric power system, comprising the following steps: determine the first value of the damping performance parameter within the preset value range of the damping performance parameter and the second value of the time-lag margin parameter of the preset value range of the time-lag margin parameter of the electric power system, respectively, so as to minimize the value of the performance index function of the wide area damping controller of the electric power system and determine the weight coefficient of the time-lag margin parameter of the electric power system in the performance index function when the value of the performance index function is minimum; and if it is determined and recognized that the weight coefficient is within the given value range, determine the gain parameter of the wide area damping controller of the electric power system according to the first value and the second value. Since the method provided in an embodiment of the present invention considers the time-lag margin parameter and the damping performance parameter of the influencing factor of the parameter of the wide area damping controller of the electric power system simultaneously, the gain parameter of the wide area damping controller of the electric power system is more accurately determined. Moreover, the wide area damping controller model of the electric power system determined by the gain parameter of the wide area damping controller of the electric power system is more stable.
[0051] On the basis of the above embodiment, the method for determining the parameter of the wide area damping controller of the electric power system provided LU102141 in an embodiment of the present invention further comprises after S1:
[0052] If it is determined and recognized that the weight coefficient is outside the given value range, update the preset value range of the damping performance parameter and the preset value range of the time-lag margin parameter, and return to S1.
[0053] Specifically, an embodiment of the present invention provides a processing solution when the weight coefficient of the time-lag margin parameter is not within the given value range, that is, when the weight coefficient is outside the given value range, the present value range of the damping performance parameter and the present value range of the time-lag margin parameter are updated at this time, that is, the preset value range of the damping performance parameter and the preset value range of the time-lag margin parameter are re-determined, and return to S1, that is, the first value and the second value within the preset value range of the damping performance parameter and the present value parameter of the time-lag margin parameter that can minimize the performance index function of the wide area damping controller of the electric power system continue to be determined. the corresponding weight coefficient of the time-lag margin parameter is determined until the weight coefficient is within the given value range, that is, the gain parameter of the wide area damping controller of the electric power system can be determined according to the first value and the second value.
[0054] The method for determining the parameter of the wide area damping controller of the electric power system provided in an embodiment of the present invention provides a processing solution for the weight coefficient of the time-lag margin parameter not within the given value range, so that the method for determining the parameter of the wide area damping controller of the electric power system provided in an embodiment of the present invention is more feasible.
[0055] On the basis of the above embodiment, for the method for determining the parameter of the wide area damping controller of the electric power system provided in an embodiment of the present invention, the performance index function is specifically as follows:
[0056] W= 8 tp (Ce) & (5)
[0057] W represents the performance index function. € represents the weight 11 coefficient of the time-lag margin parameter of the electric power system. € =0, LU102141 T represents the time-lag margin parameter of the electric power system. C- € represents the weight coefficient of the damping performance parameter of the electric power system. € represents the damping performance parameter of the electric power system, and C is a constant.
[0058] Specifically, the objective of determining the parameter of the wide area damping controller of the electric power system is to improve the damping performance of the entire electric power system, so the performance index function shown in Formula (5) is used to measure a performance index of the wide area damping controller of the electric power system. It can also be seen from Formula (5) that the time-lag margin and the damping performance in the electric power system are in an inversely restriction relationship, that is, if one becomes larger, the other becomes smaller.
[0059] On the basis of the above embodiment, for the method for determining the parameter of the wide area damping controller of the electric power system provided in an embodiment of the present invention, the initially determined preset value range of the damping performance parameter is 0-150, and the initially determined preset value range of the time-lag margin parameter is 0.5s-1s. The two initial value ranges can be determined based on empirical values, or can be selected according to needs at discretion. When the preset value range of the damping performance parameter and the preset value range of the time-lag margin parameter are updated, the interval length of the value range can be guaranteed to remain unchanged, and the upper and lower limits of an interval can be changed to update the initially determined preset value range of the damping performance parameter to be 2-152, and update the initially determined preset value range of the time-lag margin parameter to be 0.7s-1 .2s. The interval length of the value range and the upper and lower limits of the interval can be changed at the same time to update the initially determined preset value range of the damping performance parameter to be 2-155, and update the initially determined preset value range of the time-lag margin parameter to be 0.7s-1 .5s. This setting can provide a closer range for the final determination of the first value and the second value.
[0060] On the basis of the above embodiment, for the method for determining the parameter of the wide area damping controller of the electric power system provided in an embodiment of the present invention, S1 is specifically implemented by a linear matrix inequality module; 12
[0061] The linear inequality module stores the performance index function in advance. The performance index function is used as an objective function, and the preset value range of the damping performance parameter and the present value range of the time-lag margin parameter are used as restriction conditions.
[0062] Specifically, in an embodiment of the present invention, when being implemented in S1, the processing operation can be implemented by the linear matrix inequality module. The performance index function is stored in advance in the linear matrix inequality module as the objective function. The determined preset value range of the damping performance parameter and the determined preset value range of the time-lag margin parameter are input to the linear matrix inequality module as the restriction conditions, so as to determine the corresponding first value of the damping performance parameter and the corresponding second value of the time-lag margin parameter when the value of the objective function is minimum. As a preferred solution, a linear matrix inequality toolbox in matlab software can be used to implement the above processing operations.
[0063] In an embodiment of the present invention, the processing operation in S1 is equivalent to one optimization process, which can more simplify the processing process of S1 and make a processing speed faster.
[0064] On the basis of the above embodiment, for the method for determining the parameter of the wide area damping controller of the electric power system provided in an embodiment of the present invention, the step of determining the gain parameters of the wide area damping controller of the electric power system according to the first value and the second value in S2 comprises:
[0065] According to the first value and the second value, the gain parameter of the wide area damping controller of the electric power system is determined by the following formula: 13
> N LU102141 | = æ x“ pK SR oo at # À VAI: y.
} Lt RARES 7 SAN
[0066] S NEE > bat 5 X
[0067] th represents the time-lag margin parameter of the electric power system. € represents the damping performance parameter of the electric power system. n is the number of items of th and € that are divided. Kwaoci is an i-th component of an i-th term t and an i-th & corresponding to the gain parameter of the wide area damping controller of the electric power system. r is the coefficient of Kwapciin an i-th th. qi is the coefficient of Kwaoci in the i-th & and Kwaoc is the gain parameter of the wide area damping controller of the electric power system.
[0068] Specifically, in an embodiment of the present invention, the determined first value and the determined second value can be directly substituted into Formula (6), and the Kwaoc can be determined by solving Formula (6).
[0069] On the basis of the above embodiment, for the method for determining the parameter of the wide area damping controller of the electric power system provided in an embodiment of the present invention, the lower limit of the given value range is 0, and the upper limit thereof is the constant C in Formula (5) to ensure that the weight coefficient of the damping performance parameter of the electric power system and the weight coefficient of the time-lag margin parameter of the electric power system are all positive.
[0070] The given value range can be set as required. In an embodiment of the present invention, the given value range can be specifically set to be 0-5, that is, the value of the constant C in Formula (5) is 5.
[0071] On the basis of the above embodiment, for the method for determining the parameter of the wide area damping controller of the electric power system provided in an embodiment of the present invention, one electric power system model needs to be selected to simulate the actual electric power system. In an embodiment of the present invention, a closed-loop electric power system model is adopted, and the 14 closed-loop power system model is reduced in order. An order reduction process LU102141 adopts a method based on numerical stability. After obtaining stable poles of the actual electric power system, all zero-poles are retained, so that a closed-loop order-reduced electric power system model is closer to the actual electric power system, and the electric power system can be stabilized and become a fully controllable order reduction power system.
[0072] On the basis of the above embodiment, a complete embodiment is adopted in an embodiment of the present invention to describe a complete process of the method for determining the parameter of the wide area damping controller of the electric power system provided in an embodiment of the present invention.
[0073] 1) First, determine the closed-loop order-reduced power system model G, and take the time-lag of 1s as an example for verification;
[0074] The closed-loop order-reduced power system G is obtained through an shur method. The order-reduced process of the model adopts the method based on the numerical stability. After obtaining stable poles of the actual system, all zero-poles are retained, so that the closed-loop order-reduced power system can be closer to the actual electric power system. The closed-loop order-reduced power system can be stabilized and become the fully controllable power system. The closed-loop order-reduced power system G obtained in an embodiment of the present invention is specifically as follows: , LR +3542 FoR Re +85 255 +5 EF)
[0075] A
[0076] 2) The selection of a parameter range: determine the initial preset value range of the damping performance parameter and the initial preset value range of the time-lag margin parameter as 0-150 and 0.5s-1s respectively;
[0077] 3) The determination of the weight coefficient: use the linear matrix inequality toolbox pre-written with the performance index function of the wide area damping controller of the electric power system to determine the weight coefficient ¢ based on the above value range that minimizes the value of the performance index parameter, and the first value and the second value corresponding to this weight coefficient €;
[0078] With the help of Matlab software for programming, the initial preset value range of the damping performance parameter and the preset value range of the time-lag margin parameter are input into the Matlab software, and the weight coefficient €, the value of the damping performance parameter, the value of the time-lag margin parameter are calculated;
[0079] 4) Determine whether the weight coefficient € is within the given value range, that is, determine whether the weight coefficient € is greater than 0 and less than 5, if € is in this interval, the program continues to proceed. The first value and the second value corresponding to the weight coefficient € are output. If € is not within the given value range, update the preset value range of the damping performance parameter and the preset value range of the time-lag margin parameter in step 2), and return to step 3) again to perform calculation until the calculated weight coefficient € is within the given value range, and output the corresponding first value and second value;
[0080] 5) The integration of the parameter: the gain parameter Kwaoc of the wide area damping controller of the electric power system can be obtained by Formula (6) through the obtained first value and second value.
[0081] According to the above steps, the gain parameter of the wide area damping controller model can be finally obtained as shown in Table 1.
[0082] Table 1 is the value of the gain parameter of the wide area damping controller model
[0083] Kg ~~ Damping Performance £ Timelaghargin Ty Weight Coefficient À Parameter Parameter ’ = LE 133,8 LS 2.34 FR ES i t 54
8.54 ISA ts DSF
[0084] Combining Formula (1), the damping controller model of the electric power system can be obtained. In an embodiment of the present invention, in Formula (1), Tw=6s, T1=0.512s, T2=0.16s. The value of the time-lag margin parameter is 1s, and Kwaoc = 1.211 can be substituted into Formula (1), and the wide area damping 16 controller model of the electric power system can be obtained in the following: LU102141 Hine (3) = en LIE {8
[0086] The simulation of an emulation process of the damping controller model of the electric power system is performed in a four-machine two-zone power system. FIG. 2 is a comparison schematic diagram of an active power oscillation curve of the electric power system and an active power oscillation curve obtained by the damping controller model of the electric power system in the prior art. In FIG. 2, the abscissa is time with the unit of s, and the ordinate is the active power with the unit of Pe (pu). It can be seen from FIG. 2 that based on the control of the damping controller model of the electric power system provided by an embodiment of the present invention, stable time of the active power of the electric power system model G can be obtained to be about 4s. Based on the control of the damping controller model of the electric power system in the prior art, the stable time of the active power of the electric power system model G can be obtained to be around 6s. It can be seen that based on the control of the damping controller model of the electric power system provided in an embodiment of the present invention, the active power of the electric power system model G can be stabilized faster.
[0087] FIG. 3 is a comparison schematic diagram of a rotor angle oscillation curve of the electric power system controlled and obtained by the damping controller model of the electric power system provided by an embodiment of the present invention and a rotor angle oscillation curve obtained by a damping controller model of an electric power system in the prior art. In FIG. 3, the abscissa is time with the unit of s, and the ordinate is the rotor angle with the unit of °. It can be seen from FIG. 3 that based on the control of the damping controller model of the electric power system provided by an embodiment of the present invention, the stable time of a rotor angle of the electric power system model G is obtained to be also about 4s. Based on the control of the damping controller model of the electric power system in the prior art, the stable time of the rotor angle of the electric power system model G is obtained to be also about 6s. It can be seen that based on the control of the damping controller model of the electric power system provided in an embodiment of the present invention, the rotor angle of the electric power system model G can be stabilized faster.
[0088] As shown in FIG. 4, on the basis of the above embodiment, an embodiment of 17 the present invention provides a system for determining a parameter of a wide area LU102141 damping controller of an electric power system, comprises: a weight coefficient determination module 41 and a gain parameter determination module 42, wherein
[0089] The weight coefficient determining module 41 is configured to determine a first value of a damping performance parameter within a preset value range of the damping performance parameter and a second value of a time-lag margin parameter of a preset value range of the time-lag margin parameter of the electric power system, respectively, so as to minimize a value of a performance index function of the wide area damping controller of the electric power system and determine a weight coefficient of the time-lag margin parameter of the electric power system in the performance index function when a value of the performance index function is minimum;
[0090] The gain parameter determination module 42 is configured to determine a gain parameter of the wide area damping controller of the electric power system according to the first value and the second value if it is determined and recognized that the weight coefficient is within a given value range; [
[0091] The performance index function is configured to characterize the capacity of the wide area damping controller of the electric power system of balancing the damping performance parameter of the electric power system and the time-lag margin parameter of the electric power system.
[0092] On the basis of the above embodiment, an embodiment of the present invention provides the system for determining the parameter of the wide area damping controller of the electric power system, further comprising: a return module, wherein
[0093] The return module is configured to update the preset value range of the damping performance parameter and the preset value range of the time-lag margin parameter if it is determined and recognized that the weight coefficient is outside the given value range, and return to S1.
[0094] On the basis of the above embodiment, an embodiment of the present invention provides the system for determining the parameter of the wide area damping controller of the electric power system, wherein the gain parameter determination module is specifically configured to: 18
[0095] According to the first value and the second value, determine the gain parameter of the wide area damping controller of the electric power system by Formula (6).
[0096] Specifically, the processing procedures realized by and the results obtained by the various modules and the above method embodiments in the system for determining the parameter of the wide area damping controller of the electric power system provided in embodiments of the present invention are in a one-to-one correspondence, and are not repeated in embodiments of the present invention here.
[0097] FIG. 5 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. On the basis of the above embodiment, an embodiment of the present invention also provides the electronic device, comprising: a processor 501, a memory 502, a communications interface 503 and a bus 504, wherein
[0098] The processor 501, the memory 502, and the communication interface 503 communicate with each other through the bus 504. The memory 502 stores program instructions executable by the processor 501. The processor 501 is configured to call the program instructions in the memory 502 to execute the method provided by the above-mentioned method embodiments, for example, comprising: S1: determine the first value of the damping performance parameter within the preset value range of the damping performance parameter and the second value of the time-lag margin parameter of the preset value range of the time-lag margin parameter of the electric power system, respectively, so as to minimize the value of the performance index function of the wide area damping controller of the electric power system and determine the weight coefficient of the time-lag margin parameter of the electric power system in the performance index function when the value of the performance index function is minimum;; S2, if it is determined and recognized that the weight coefficient is at the given value Within the range, the gain parameter of the wide area damping controller of the electric power system is determined according to the first value and the second value.
[0099] When being able to be implemented in the form of software functional units and sold or used as an independent product, logic instructions in the memory 502 can be stored in a computer readable storage medium. Based on this understanding, 19 the technical solutions of the present invention or the part that contributes to the LU102141 prior art or the part of the technical solutions can be essentially embodied in the form of a software product. The computer software product is stored in one storage medium and comprises several instructions that are used to make a computer apparatus (which may be a personal computer, a server, a network apparatus or the like) execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium comprises a U disk, a mobile hard disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk, an optical disk or other media that can store a program code.
[0100] On the basis of the above embodiment, an embodiment of the present invention provide a non-transitory computer-readable storage medium which stores computer instructions. The computer instructions cause a computer to execute the above method provided by each method embodiment, the method comprises for example: S1: determine the first value of the damping performance parameter within the preset value range of the damping performance parameter and the second value of the time-lag margin parameter of the preset value range of the time-lag margin parameter of the electric power system, respectively, so as to minimize the value of the performance index function of the wide area damping controller of the electric power system and determine the weight coefficient of the time-lag margin parameter of the electric power system in the performance index function when the value of the performance index function is minimum;; S2, if it is determined and recognized that the weight coefficient is at the given value Within the range, the gain parameter of the wide area damping controller of the electric power system is determined according to the first value and the second value.
[0101] The apparatus embodiments described above are merely illustrative, wherein a unit described as a separate component may or may not be physically separated. A component displayed as the unit may or may not be a physical unit and can be located in one place or can be distributed to a plurality of network units. A part of or all of the modules may be selected according to actual needs to achieve the objective of the solutions of embodiments, which the person skilled in the art can understand and implement without creative work.
[0102] Through the description of the above embodiment, the person skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware. Based on this understanding, the above technical LU102141 solutions or the part that contributes to the prior art or the part of the technical solutions can be essentially embodied in the form of the software product, which can be stored in the computer-readable storage medium, such as ROM/RAM, the magnetic disc, the optical disc and the like, and comprises a number of instructions that are used to make the computer apparatus (which may be the personal computer, the server, the network apparatus or the like) execute the method described in each embodiment or some parts of embodiments.
[0103] Finally, it should be noted that the above embodiment are only used to illustrate the technical solutions of the present invention, not to limit thereto. Although the present invention has been described in detail with reference to the above embodiments, the person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or part of the technical features can be equivalently replaced. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of embodiments of the present invention.
21
Claims (10)
1. A method for determining a parameter of a wide area damping controller of an electric power system, comprising: S1: determine a first value of a damping performance parameter within a preset value range of the damping performance parameter and a second value of a time-lag margin parameter of a preset value range of the time-lag margin parameter of the electric power system, respectively, so as to minimize a value of a performance index function of the wide area damping controller of the electric power system and determine a weight coefficient of the time-lag margin parameter of the electric power system in the performance index function when a value of the performance index function is minimum; S2: if it is determined and recognized that the weight coefficient is within a given value range, determine a gain parameter of the wide area damping controller of the electric power system according to the first value and the second value; wherein The performance index function is configured to characterize the capacity of the wide area damping controller of the electric power system of balancing the damping performance parameter of the electric power system and the time-lag margin parameter of the electric power system.
2. The method for determining the parameter of the wide area damping controller of the electric power system according to claim 1, wherein after S1, the method further comprises: If it is determined and recognized that the weight coefficient is outside the given value range, update the preset value range of the damping performance parameter and the preset value range of the time-lag margin parameter, and return to S1.
3. The method for determining the parameter of the wide area damping controller of the electric power system according to claim 1, wherein the performance index function is specifically as follows: W=e T- (C-e ) &' W represents the performance index function, € represents the weight coefficient of the time-lag margin parameter of the electric power system, t represents the time-lag margin parameter of the electric power system, and C-e represents the weight coefficient of the damping performance parameter of the electric power system, € represents the damping performance parameter of the electric power system, and C is a constant.
4. The method for determining the parameter of the wide area damping controller of the electric power system according to claim 1, wherein the preset value range of the damping performance parameter is 0-150, and the preset value range of the time-lag margin parameter is 0.5s-1s.
5. The method for determining the parameter of the wide area damping controller of the electric power system according to any one of claims 1-4, wherein S1 is specifically implemented by a linear matrix inequality module; 22
The linear inequality module stores the performance index function in advance, uses the LU102141 performance index function as an objective function, and uses the present value range of the damping performance parameter and the preset value range of the time-lag margin parameter as a restriction condition.
6. The method for determining the parameter of the wide area damping controller of the electric power system according to claim 5, wherein the step of determining the gain parameter of the wide area damping controller of the electric power system according to the first value and the second value in S2 comprises: According to the first value and the second value, determine the gain parameter of the wide area damping controller of the electric power system by the following formula: | Th Zn À sane | => Ya Kans | > Kane = Kane | Kee TR 21200028 Th represents the time-lag margin parameter of the electric power system, & represents the damping performance parameter of the electric power system, n is the number of items of tand € that are divided, Kwapci is an i-th component of the gain parameter of the wide area damping controller of the electric power system corresponding to an i-th t and an i-th &, r is the coefficient of Kwapg in the i-th 1, qi is the coefficient of Kwapciin the i-th € and Kwaoc is the gain parameter of the wide area damping controller of the electric power system.
7. The method for determining the parameter of the wide area damping controller of the electric power system according to any one of claims 1-4, wherein the given value range is specifically 0-5.
8. An electric power system for determining a parameter of a wide area damping controller, comprising: A weight coefficient determination module, configured to determine a first value of a damping performance parameter within a preset value range of the damping performance parameter and a second value of a time-lag margin parameter of a preset value range of the time-lag margin parameter of the electric power system, respectively, so as to minimize a value of a performance index function of the wide area damping controller of the electric power system and determine a weight coefficient of the time-lag margin parameter of the electric power system in the performance index function when a value of the performance index function is minimum; A gain parameter determination module, configured to determine a gain parameter of the wide area damping controller of the electric power system according to the first value and the second value if it is determined and recognized that the weight coefficient is within a given 23 value range; LU102141 The performance index function is configured to characterize the capacity of the wide area damping controller of the electric power system of balancing the damping performance parameter of the electric power system and the time-lag margin parameter of the electric power system.
9. An electronic apparatus, comprising: At least one processor, at least one memory, a communication interface and a bus, wherein, The processor, the memory, and the communication interface communicate with each other through the bus; The memory stores program instructions executable by the processor, and the processor calls the program instructions to execute a method for determining a parameter of a wide area damping controller of an electric power system according to any one of claims 1 to 7.
10. A non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer instructions that cause a computer to execute a method for determining a parameter of a wide area damping controller of an electric power system according to any one of claims 1 to 7.
24
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| LU102141A LU102141B1 (en) | 2020-10-20 | 2020-10-20 | Method and system for determining parameter of wide area damping controller of electric power system |
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| LU102141A LU102141B1 (en) | 2020-10-20 | 2020-10-20 | Method and system for determining parameter of wide area damping controller of electric power system |
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