A practical parameter configuration method of power system stabilizer PSS4B

Abstract

The application discloses a practical parameter configuration method of a power system stabilizer (PSS4B), which comprises the following steps: analyzing and determining frequency oscillation characteristic values of an actual engineering application scene; setting three frequency band pass filter center frequencies and proportional coefficients according to the frequency oscillation characteristic values; calculating three frequency band mixing module parameters according to the practical parameter configuration method; setting lead-lag compensation link parameters according to a classical method; placing the PSS4B in the actual engineering application scene, adjusting the proportional coefficients of corresponding frequency bands according to the frequency oscillation characteristic values until the suppression effect reaches the requirement. The application deduces expressions and mixing module parameters of the PSS4B high, medium and low frequency band mixing module parameters based on a PSS4B equivalent simplified model, significantly reduces the number of parameters required to be configured by the PSS4B, and improves the practicality, operability and parameter configuration efficiency.

Description

Technical Field

[0001] This invention relates to the field of PSS4B frequency oscillation suppression technology, specifically to a practical parameter configuration method for the power system stabilizer PSS4B. Background Technology

[0002] Power system stabilizers (PSS) are currently the most mature and effective means of suppressing low-frequency oscillations and are widely used in power grids at all levels. The principle is to add a control loop to the generator excitation system to output an additional control signal to the output of the voltage regulator, thereby compensating for the negative damping torque that the voltage regulator may generate, so that it generates positive damping torque, thereby improving the low-frequency oscillation damping capability of the generator and the system and improving the dynamic performance of the system.

[0003] Traditional PSS2B is effective for a specific frequency band, but with increasingly complex power grid structures and operating conditions, the range of system frequency oscillations is constantly expanding. For oscillations outside the specific frequency band, such as ultra-low frequency oscillations below 0.1Hz, the effectiveness of PSS2B is limited. To address the limited frequency band coverage of PSS2B, PSS4B has gradually been put into use. PSS4B can suppress frequency oscillations broadly and flexibly across low, medium, and high frequency bands. However, due to its relatively complex structure, it requires far more parameters to be set than PSS2B. The latter typically only requires configuring 6 time constants and 1 total gain, while PSS4B requires configuring more than 50 parameters. This results in high complexity and low efficiency for practical engineering applications.

[0004] Currently, there is no universally applicable method for parameter tuning of PSS4B. Both academia and industry are actively exploring and researching parameter tuning and optimization methods. Some methods combine phase compensation and root locus methods while introducing probabilistic sensitivity indices; others employ intelligent algorithms such as particle swarm optimization, artificial fish swarm optimization, and co-evolutionary optimization. These are all meaningful explorations and have played a certain role, but they remain relatively complex and lack practicality for engineering applications.

[0005] Therefore, the parameter configuration method of PSS4B is optimized, and a more efficient and practical parameter configuration method is proposed while maintaining its technical advantages, which is convenient for practical engineering applications. Summary of the Invention

[0006] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0007] In view of the above-mentioned problems, the present invention is proposed.

[0008] Therefore, the technical problem solved by this invention is that the current parameter tuning of PSS4B is still relatively complex for engineering applications, requiring the configuration of more than 50 parameters, which is not practical and inefficient for actual engineering applications.

[0009] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a practical parameter configuration method for a power system stabilizer PSS4B, comprising:

[0010] Analyze and determine the frequency oscillation characteristic values ​​of actual engineering application scenarios;

[0011] Based on the frequency oscillation characteristic values, the center frequencies and scaling factors of the three bandpass filters are set;

[0012] The parameters of the three frequency band hybrid module were calculated based on the practical parameter configuration method;

[0013] The parameters of the lead-lag compensation link are tuned according to the classical method;

[0014] Place the PSS4B in the actual engineering application scenario and adjust the proportional coefficient of the corresponding frequency band according to the frequency oscillation characteristics until the suppression effect meets the requirements.

[0015] As a preferred embodiment of the practical parameter configuration method for the power system stabilizer PSS4B described in this invention, the frequency oscillation characteristics include low-frequency oscillation values ​​that have occurred or have not occurred in the actual engineering application scenario.

[0016] As a preferred embodiment of the practical parameter configuration method for the power system stabilizer PSS4B described in this invention, the setting of the center frequencies and scaling factors of the three bandpass filters is based on the three frequency band standard reference values ​​in the IEEE 421.5 standard, including: low frequency f L =0.07Hz, intermediate frequency f I =0.7Hz, high frequency f H =8Hz.

[0017] As a preferred embodiment of the practical parameter configuration method for the power system stabilizer PSS4B described in this invention, wherein: when the frequency oscillation characteristic value is located at a non-intermediate position between two standard reference values ​​of frequency bands, the center frequency of the corresponding frequency band is set to the same value as the frequency oscillation characteristic value, and the other frequency bands are the standard reference values;

[0018] When the frequency oscillation characteristic value is located at the midpoint between the standard reference values ​​of the two frequency bands, the center frequency of the corresponding frequency band is set as f. L=0.05Hz f I =0.55Hz, f H =8Hz.

[0019] As a preferred embodiment of the practical parameter configuration method for the power system stabilizer PSS4B described in this invention, the practical parameter configuration method includes:

[0020] The transfer function of the filter element is obtained by performing differential calculations on the positive and negative branches of each frequency band:

[0021]

[0022] In general, the constant K of the positive and negative branch hybrid module C11 =K C17 =1;T C1 T C2 T C7 T C8 K is the time constant of the positive and negative branch hybrid module; C1 K C2 These are the scaling factors for the positive and negative branch hybrid modules, respectively; both the time constant and the scaling factor need to be calculated and configured using practical parameter configuration methods.

[0023] As a preferred embodiment of the practical parameter configuration method for the power system stabilizer PSS4B described in this invention, the practical parameter configuration method further includes:

[0024] Comparing equation (1) with the transfer function of the bandpass filter, we get:

[0025]

[0026] Where R is the proportionality coefficient, which can be used to adjust the passband width of the bandpass filter. Its standard reference value is 1.2, and it is dynamically adjusted according to the needs in actual applications; fc is the center frequency of the bandpass filter.

[0027] As a preferred embodiment of the practical parameter configuration method for the power system stabilizer PSS4B described in this invention, the transfer function of the bandpass filter is expressed as:

[0028]

[0029] Where ξ is the filter damping coefficient, G0 is the filter passband gain, and ω0 is the filter center angular frequency.

[0030] As a preferred embodiment of the practical parameter configuration method for the power system stabilizer PSS4B described in this invention, the practical parameter configuration method further includes:

[0031] The parameter expression of the hybrid module is derived from equation (2):

[0032]

[0033] The time constant and scaling factor of the positive and negative branch hybrid module can be calculated from the center frequency fc and the scaling factor R.

[0034] As a preferred embodiment of the practical parameter configuration method for the power system stabilizer PSS4B described in this invention, the classic methods include: frequency response curves and root locus method.

[0035] In a preferred embodiment of the practical parameter configuration method for the power system stabilizer PSS4B described in this invention, the proportional coefficient R is typically set to 1.2.

[0036] The beneficial effects of this invention are as follows: The practical parameter configuration method for the power system stabilizer PSS4B is based on the equivalent simplified model of PSS4B. Expressions applicable to the parameters of the hybrid modules in the high, medium, and low frequency bands of PSS4B are derived. In these expressions, the hybrid module parameters are obtained from the center frequency and scaling factor of the equivalent bandpass filter, significantly reducing the number of parameters required for PSS4B configuration and improving practicality, operability, and parameter configuration efficiency. Furthermore, methods and directions for adjusting the scaling factor R can be proposed based on the actual application scenarios of PSS4B, further improving the accuracy of the parameter configuration method. Finally, the complete execution flow of the practical parameter configuration method is improved. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0038] Figure 1 The overall flowchart of a practical parameter configuration method for a power system stabilizer PSS4B provided in the first embodiment of the present invention;

[0039] Figure 2 A general mathematical model diagram of a power system stabilizer PSS4B provided for the first embodiment of the present invention;

[0040] Figure 3 An equivalent simplified model of the power system stabilizer PSS4B is provided for the first embodiment of the present invention;

[0041] Figure 4A modeling parameter simulation diagram of a practical parameter configuration method for a power system stabilizer PSS4B provided in the second embodiment of the present invention;

[0042] Figure 5 The simulation test results of a practical parameter configuration method for a power system stabilizer PSS4B provided in the second embodiment of the present invention are shown in the figure. Detailed Implementation

[0043] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0044] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0045] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0046] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0047] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] Example 1

[0050] Reference Figures 1-3 As an embodiment of the present invention, a practical parameter configuration method for a power system stabilizer PSS4B is provided, comprising:

[0051] S1: Analyze and determine the frequency oscillation characteristic values ​​of actual engineering application scenarios;

[0052] Furthermore, frequency oscillation characteristics include low-frequency oscillation values ​​that have occurred or have never occurred in actual engineering application scenarios.

[0053] It should be noted that subsequent parameter configuration is related to the frequency oscillation characteristics of the application scenario, therefore analysis is required first. The analysis method mainly relies on low-frequency oscillation cases that have occurred in actual engineering projects. The oscillation frequency of low-frequency oscillations that have occurred before, or even occurred multiple times, can be used as the typical oscillation frequency of the scenario, and the corresponding parameters can be configured accordingly based on this standard. If low-frequency oscillations have never occurred, the PSS4B parameter configuration method can be used to model the actual application scenario using commonly used power system analysis software (such as Matlab / Simulink, RTDS), and then a fault test can be conducted based on the model to induce low-frequency oscillations in the system. The low-frequency oscillation results obtained from the simulation test can be used as the characteristic oscillation frequency of the scenario.

[0054] S2: Based on the frequency oscillation characteristic value, set the center frequency and scaling factor of the three bandpass filters;

[0055] Furthermore, the center frequencies and scaling factors of the three bandpass filters are set based on the standard reference values ​​for the three bands in the IEEE 421.5 standard, including: low frequency f L =0.07Hz, intermediate frequency f I =0.7Hz, high frequency f H Set to 8Hz.

[0056] It should be noted that the center frequency and scaling factor R of each frequency band are set based on the frequency oscillation characteristic value, which is mainly based on the standard reference values ​​of the three frequency bands in the IEEE 421.5 standard.

[0057] Furthermore, when the frequency oscillation characteristic value is located at a position other than the middle value of the standard reference values ​​of two frequency bands, the center frequency of the corresponding frequency band is set to the same value as the frequency oscillation characteristic value, and the other frequency bands are the standard reference values;

[0058] Furthermore, the scaling factor R is normally set to 1.2.

[0059] It should be noted that, based on the analysis of the frequency oscillation characteristics of actual engineering application scenarios, we need to set the center frequency of the corresponding frequency band to this characteristic frequency or a value close to it, so as to ensure that the harmonics of this characteristic frequency can be allocated to the corresponding frequency band. Specifically, for a certain actual engineering application scenario, we analyze and find that its oscillation frequency characteristic value is 0.06Hz. The harmonics at this frequency are what we need to focus on and suppress. Therefore, we can set the center frequency f of the low-frequency band... L Set to 0.06Hz, the center frequencies of the other two frequency bands can be set to standard reference values. The typical center frequencies for the three bands given in the IEEE 421.5 standard are fL = 0.07Hz, fI = 0.7Hz, and fH = 8Hz. Similarly, if the characteristic frequency value analysis shows 0.8Hz, then the center frequency of the mid-frequency band can be set to fL = 0.07Hz, fI = 0.7Hz, and fH = 8Hz. I Set it to 0.8Hz, and set the other two frequency bands to the standard reference value, and so on.

[0060] Furthermore, when the frequency oscillation characteristic value is located at the midpoint between the two standard reference values ​​for the frequency bands, the center frequency of the corresponding frequency band is set to f. L =0.05Hz f I =0.55Hz, f H =8Hz.

[0061] It should be noted that if the analyzed characteristic frequency value falls in the middle of the standard reference values ​​for the two frequency bands, such as 0.3Hz, then f I It cannot be set to 0.3Hz, otherwise the center frequencies of the mid- and low-frequency bands will be too close, causing strong cross-band coupling and reducing the oscillation suppression effect. In this case, f I Setting it to 0.55Hz is more reasonable. In this special case, the passband width of the filter can be adjusted by adjusting the scaling factor R, thereby reducing the coupling effect. The reason is that by appropriately reducing the value of R, the passband width is reduced, and the cross-frequency coupling effect is weakened.

[0062] Regarding the R value, it should be noted that since the center frequencies of the three frequency bands are generally quite close, there is some coupling between the bands in this configuration, which affects their respective suppression effects on frequency oscillations. Therefore, fine-tuning the scaling factor R for each band and adjusting the passband width can improve this problem. For example, if the main suppression frequency in the scenario is in the high-frequency band, then adjusting R appropriately reduces the high-frequency passband width. The specific parameter values ​​are obtained through testing in actual scenarios. The adjustment of the center frequency and scaling factor R is mainly done through testing. After adjustment, the system is tested in an actual system or simulation system. If the effect meets the requirements, no further adjustment is needed; otherwise, continue adjusting the parameter values ​​according to the above logic until the effect meets the requirements.

[0063] S3: The parameters of the three frequency band hybrid module are calculated based on the practical parameter configuration method;

[0064] Furthermore, practical parameter configuration methods include:

[0065] It should be noted that, through Figure 3 It can be seen that the center frequencies of the simplified high, mid, and low frequency band bandpass filters are f0, f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f H f I f L The gain amplitudes are K H K I K L Each equivalent bandpass filter is obtained by differentially dividing the positive and negative branches of the original frequency band. (Comparison) Figure 2 , Figure 3 It can be seen that once the parameters of the equivalent bandpass filter are determined, the parameters of the PSS4B filtering stage can be obtained. Each bandpass filter requires three parameters to be determined: the center frequency and gain amplitude mentioned above, and a scaling factor R, which determines the passband width of the bandpass filter. In the simplified model, the bandpass filter is required to have an amplitude response of 1 (maximum value) and a phase response of 0 at the center frequency. Therefore, the calculation method for the PSS4B parameters can be derived as follows:

[0066] Since the PSS4B has a symmetrical structure across its high, mid, and low frequency bands, the derivation process is the same. Here, we use the general subscript C to replace the original subscripts H, I, and L for the high, mid, and low frequency bands.

[0067] against Figure 2 Typical structure of PSS4B:

[0068] The transfer function of the filter element is obtained by performing differential calculations on the positive and negative branches of each frequency band:

[0069]

[0070] In general, the constant K of the positive and negative branch hybrid module C11 =K C17 =1;T C1 T C2 T C7 T C8 K is the time constant of the positive and negative branch hybrid module; C1 K C2 These are the scaling factors for the positive and negative branch hybrid modules, respectively; both the time constant and the scaling factor need to be calculated and configured using practical parameter configuration methods.

[0071] Furthermore, practical parameter configuration methods also include:

[0072] Comparing equation (1) with the transfer function of the bandpass filter, we get:

[0073]

[0074] Where R is the proportionality coefficient, which can be used to adjust the passband width of the bandpass filter. Its standard reference value is 1.2, and it is dynamically adjusted according to the needs in actual applications; fc is the center frequency of the bandpass filter.

[0075] Furthermore, the transfer function of a bandpass filter can be expressed as:

[0076]

[0077] Where ξ is the filter damping coefficient, G0 is the filter passband gain, and ω0 is the filter center angular frequency.

[0078] Furthermore, practical parameter configuration methods also include:

[0079] The expression for the parameters of the hybrid module is derived from equation (2):

[0080]

[0081] The time constant and scaling factor of the positive and negative branch hybrid module can be calculated from the center frequency fc and the scaling factor R.

[0082] It should be noted that the parameter expression of this hybrid module can be calculated according to formula (3), etc., as long as the center frequency and scaling factor of each frequency band are determined. Furthermore, when the scaling factor R and the center frequency f... C Once determined, the parameters of each frequency band mixing module are determined accordingly.

[0083] Furthermore, as can be seen from the above explanation of principles and parameter derivation process, the number of parameters required for the practical PSS4B parameter configuration method is significantly reduced. Typically, the parameters of the lead-lag compensation stages for the positive and negative branches of the same frequency band are also set to the same value. Therefore, the parameters required for the practical parameter configuration method are summarized in the table below (parameter names correspond to the appendix). Figure 2 , Figure 3 ):

[0084] Table 1. Parameters required for PSS4B practical parameter configuration method.

[0085]

[0086] As shown in Table 1, the number of parameters required for the practical configuration method is reduced to 22, which is a significant reduction compared to the more than 50 parameters in the typical structure. This greatly improves the parameter configuration efficiency of PSS4B and makes it more suitable for engineering applications.

[0087] S4: Tune the parameters of the lead-lag compensation link according to the classical method;

[0088] Furthermore, classic methods include: frequency response curves and root locus method.

[0089] It should be noted that the classic method for setting the parameters of the compensation circuit is to observe the trend of the curves under different parameters based on the amplitude and phase frequency response curves or the root locus curve of the compensation circuit, and then select the appropriate parameters according to the compensation effect to be achieved. Generally, it is desirable for the compensation circuit to provide a phase lead angle of about 40° to 50° in the range of 0.1 to 2Hz, and then the appropriate parameters can be selected based on the curve.

[0090] S5: Place the PSS4B in a real-world engineering application scenario and adjust the proportional coefficient of the corresponding frequency band according to the frequency oscillation characteristics until the suppression effect meets the requirements.

[0091] It should be noted that the standard for suppression effect needs to be selected based on the actual engineering situation. For example, if the project requires that the ultra-low frequency oscillations subside within a specific time, then this standard should be used when configuring parameters. Each set of parameters should be tested in the actual system or simulation system to see if the effect meets the standard. Generally, if the project has no special requirements, it needs to be judged manually. Generally, if the oscillations that need to be suppressed can subside in a short time, the requirement is met. Alternatively, according to the industry standard (DL / T 1231-2013) "Guidelines for Setting Tests of Power System Stabilizers," the damping ratio provided by the PSS to attenuate oscillations should generally not be less than 0.1. This should be used as the standard for achieving the desired effect. After each set of parameters is configured and tested, the damping ratio of the oscillation waveform should be calculated. If it is not less than 0.1, the suppression effect requirement is met.

[0092] Example 2

[0093] Reference Figure 4-5 As an embodiment of the present invention, a practical parameter configuration method for the power system stabilizer PSS4B is provided. To verify the beneficial effects of the present invention, a simulation experiment is conducted for scientific demonstration.

[0094] The PSS4B model shown in the figure below was built based on the Real-Time Digital Simulator (RTDS), and the parameters were configured according to the practical parameter configuration method.

[0095] A large-scale power grid system test model was established in RTDS, and the generator excitation system was modeled using PSS4B, such as... Figure 4 As shown, simulation tests of PSS4B suppression of ultra-low frequency oscillations were carried out at four power plants in Yunnan Province: Xiluodu, Nuozhadu, Xiaowan, and Jinanqiao. The results verified the oscillation suppression effect of PSS4B in a large system using this practical method for parameter configuration.

[0096] The test conditions are as follows: Nuozhadu Power Plant installed PSS4B, the power of Chusui DC was increased by 400MW (3000MW to 3400MW), the increase rate was 400MW / min, and the FLCs of Niucong, Chusui and Puqiao DC were all put into operation. The typical oscillation frequency obtained by simulation was 0.063Hz.

[0097] The simulation test results obtained are as follows Figure 5 It includes three types: no PSS, PSS2B, and PSS4B.

[0098] The experimental results show that the PSS4B configured with this practical method can significantly suppress ultra-low frequency oscillations in large systems, with a much better effect than PSS without PSS or PSS2B. This experiment demonstrates the effectiveness of this practical method for engineering applications.

[0099] It should be noted that this invention is a practical parameter configuration method. Compared with various existing PSS4B parameter configuration methods, its main advantages are high configuration efficiency, ease of calculation, and suitability for engineering applications rather than academic research. The parameters configured using this practical method in this embodiment can meet the needs of engineering applications. Other methods are more complex, and while the configured parameters may also meet the oscillation suppression requirements, they require more effort and time to calculate, making them less practical.

[0100] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A practical parameter configuration method for a power system stabilizer PSS4B, characterized in that, include: Analyze and determine the frequency oscillation characteristic values ​​of actual engineering application scenarios; Based on the frequency oscillation characteristic values, the center frequencies and scaling factors of the three bandpass filters are set; The parameters of the three frequency band hybrid module were calculated based on the practical parameter configuration method; The practical parameter configuration method includes: The transfer function of the filter element is obtained by performing differential calculations on the positive and negative branches of each frequency band: （1） Wherein, the constant K of the positive and negative branch mixing module C11 =K C17 =1; T C1 , T C2 , T C7 , T C8 is the time constant of the positive and negative branch mixing module; K C1 , K C2 are the proportional coefficients of the positive and negative branch mixing module respectively; the time constant and the proportional coefficient both need to be calculated and configured by the practical parameter configuration method; It also includes: comparing equation (1) with the transfer function of the bandpass filter, we get: （2） Where R is a proportionality coefficient, which can be used to adjust the passband width of the bandpass filter, and its standard reference value is 1.2; The center frequency of the bandpass filter; It also includes: the parameter expression of the hybrid module derived from equation (2): （3） The time constant of the positive and negative branch hybrid module is determined by the center frequency. The proportional coefficient R is calculated from the proportional coefficient R; the proportional coefficient of the positive and negative branch hybrid module is calculated from the proportional coefficient R. The parameters of the lead-lag compensation link are tuned according to the classical method; Place the PSS4B in the actual engineering application scenario and adjust the proportional coefficient of the corresponding frequency band according to the frequency oscillation characteristics until the suppression effect meets the requirements.

2. The practical parameter configuration method for the power system stabilizer PSS4B as described in claim 1, characterized in that: The frequency oscillation characteristics include low-frequency oscillation values ​​that have occurred or have not occurred in the actual engineering application scenario.

3. The practical parameter configuration method for the power system stabilizer PSS4B as described in claim 2, characterized in that: The setting of the center frequencies and scaling factors for the three bandpass filters is based on the standard reference values ​​for the three bands in the IEEE 421.5 standard, including: low frequency f L =0.07Hz, intermediate frequency f I =0.7Hz, high frequency f H =8Hz.

4. The practical parameter configuration method for the power system stabilizer PSS4B as described in claim 2 or 3, characterized in that, When the frequency oscillation characteristic value is located at a position other than the middle value of the two standard reference values ​​of the frequency band, the center frequency of the corresponding frequency band is set to the same value as the frequency oscillation characteristic value, and the other frequency bands are the standard reference values. When the frequency oscillation characteristic value is located at the midpoint between the standard reference values ​​of the two frequency bands, the center frequency of the corresponding frequency band is set as f. L =0.05 Hz f I =0.55Hz, f H =8Hz.

5. The practical parameter configuration method for the power system stabilizer PSS4B as described in claim 4, characterized in that, The transfer function of the bandpass filter is expressed as: in, G is the filter damping coefficient, and G0 is the filter passband gain. This is the center angular frequency of the filter.

6. The practical parameter configuration method for the power system stabilizer PSS4B as described in claim 5, characterized in that, The classic methods include: frequency response curves and root locus method.

7. The practical parameter configuration method for the power system stabilizer PSS4B as described in claim 6, characterized in that, The scaling factor R is set to 1.2.

Images