Effective Asynchronous Damping Coefficient Algorithm. The example shows that the equivalent asynchronous damping coefficient obtained by this algorithm can accurately describe the effect of the damper winding on the stability of the power system. In the past, when people were engaged in power system stability analysis research or controller design, in order to save computing memory and avoid disasters, the power system was often simplified and reduced. The usual practice is to exclude the effects of the damper windings for certain generator sets, and consider them in a simplified model to achieve a reduction in order. It is assumed that in the process of low-frequency oscillations in the power system, the current induced in the damper windings is still negligibly small, so the damper winding can be completely ignored in the system model. If the damping strength of the generator set is sensitive to the dominant oscillation mode or unstable oscillation mode of the power system, simply ignore the damping winding of the generator set and discard the asynchronous damping effect of the generator set, which may discriminate the stable power system as not stable. The conclusion of the ring stability forces people to take measures to improve stability, resulting in unnecessary economic losses. In view of this situation, the eigenvalue and sensitivity analysis techniques are used in this paper, and the equivalent asynchronous damping coefficient algorithm for maintaining the real part of the eigenvalue of the sensitive oscillation mode before and after the generator is reduced is given. in conclusion. The higher the model order of the general generator set, the more detailed and realistic the description of the generator set, but the more computer memory is occupied, the slower the analysis speed will be. Therefore, the generator-ordered model has a fixed-order sub-transient potential change model as the original model, and the transient potential change model without generator-damper winding is used as a reduced-order model to study the equivalent asynchronous damping coefficient algorithm. . The subtransient potentials of the alternator alternating shaft taking into account the damper windings are divided by 1 and the incremental differential equations of the generator slips are given below, which is the mechanical damping coefficient of the generator set. The meanings of other symbols are given in the literature. It can be concluded that the full power system linearized differential equations 2 force 如下, where 4 is a coefficient matrix containing parameters such as 7 and 7 In order to reduce the order of the matrix 4, only considering the variation of the generator's cross-axis transient potential, the incremental differential equations of the generator set slip are as follows, which is the comprehensive damping coefficient of the generator set. In the same way, we can draw the following form of linearized differential equations for all-power systems: 1 is a coefficient matrix that contains parameters such as coherence and coherence. For the comprehensive damping coefficient of the generator set, the following relationship holds: The equivalent asynchronous damping coefficient of the generator damping winding is considered. Sexual research analysis results in deviations. First, the unit's comprehensive damping coefficient is calculated, and then the mechanical damping coefficient is subtracted to obtain the equivalent asynchronous damping coefficient. Since the damping of each unit is mainly affected by the damping of the unit, the damping of the mechanical oscillation mode of the unit is mainly affected by the oscillation frequency. Therefore, the equivalent asynchronous damping coefficient can be obtained by the following calculation steps. 1 Find the eigenvalues ​​and eigenvectors of the unreduced power system according to Equation 2, and then determine the sensitivity of the unit's damping coefficient for all conjugate complex eigenvalue real parts of the system to be reduced. Among them, there are common claws for the real part of the conjugate complex eigenvalues ​​of the third pair. For conjugate complex eigenvalues, people are the left and right normalized eigenvectors of the first pair of conjugate complex eigenvalues, and 0 is the seventh reduced order unit damping coefficient for the whole system. According to the above-mentioned negative value of the sensitivity, the conjugate complex eigenvalue corresponding to the first step-down unit is identified, and its real part is denoted as 1. Deduction. The initial value of the comprehensive damping coefficient of the step-down unit is taken as 1 =, the lean is zero, and the number of calculation iterations is set to 0, and the given calculation accuracy is safe. Calculate the eigenvalues ​​and eigenvectors of the reduced-order power system according to Equation 4, and then determine the sensitivity of the real part of all conjugate complex eigenvalues ​​of the system to the damping coefficient of the reduced-order unit to identify the corresponding conjugate complex eigenvalues ​​of the first-order genus unit. Department is recorded as = all. Values ​​are configured for feature values. It is noted that the correction factor of the integrated damping coefficient of the first-order step-down unit is 4, if there is 5, the calculation result is output and iterative calculation is stopped. Otherwise, let the left +1 =, according to the modified comprehensive damping coefficient correction matrix, go to step 3. And the operating parameter target value. Node No. is a 12-cube small unit equivalent machine, No. 42 is a five-unit 100, Jia unit is an equal-value machine, No. 53 is a three-unit No. 100, and Jia is an equivalent unit. Node 13 carries a load. For a brief explanation, all loads are considered as constant impedance, and all generator stator winding resistances and mechanical damping coefficients are taken as zero. The meanings of the adjustment system frame and parameters are detailed. The No. 1 machine is a fixed excitation; the No. 23 machine has the same excitation adjustment system, and the parameters are as follows. No. 13 machines are all turbine generators. The corresponding single-motor speed regulation system is the same. The parameters are as follows: No.1 unit No single regenerator No.1 iso machine The single generator parameter is the relative power angle change curve stabilization measure to prevent the system from disintegrating 5. Obviously, this conclusion will result in Unnecessary economic losses. Comparing 42 it can be seen that the damper winding plays a role in the large disturbance process when using the generator reduced model. 1 The generator reduction model should be used with caution. As long as the computer hardware conditions permit, the reduced-order model should be avoided. When using a reduced-order model of a generator set with no damper windings, neglecting the effect of the asynchronous damping of the damper windings may give erroneous conclusions to the research or analysis results, which will result in unnecessary economic losses. Using the eigenvalues ​​and sensitivity analysis techniques at 2 meters, the algorithm for the equivalent asynchronous damping coefficient with the real part of the eigenvalues ​​of the sensitive oscillation modes before and after the stepping down of the generator is given. The example shows that this algorithm can well take into account the effect of the damper winding on the stability of the power system. 3.1 Generator Model Reduction and Equivalent Asynchronous Damping Coefficient Analysis and Calculation Case 1 The generator adopts the model 1 and the available real mechanical values ​​of the mechanical oscillation modes corresponding to the No. 3 unit are 42±12.7365. The value is not listed, indicating that the system is small and stable under the mode of operation of the research system. In case 2 the generator adopts the reduced-order model of formula 2 and does not account for the asynchronous damping effect. The eigenvalues ​​of the corresponding mechanical oscillation mode of the No. 13 engine are respectively +1.0919±12.275 unstable. In order to improve the stability of the system, this conclusion forced people to install additional controllers on the relevant generator sets, which would ultimately result in wastage of investment. Condition 3 The generator adopts a reduced-order model of type 2 and takes into account the effect of the asynchronous damping of the damper windings. The equivalent asynchronous damping coefficient of the single machine equivalent to the No. 13 isolator is 1.332 14.1373 and 7.3569 respectively, corresponding to the mechanical oscillation mode. The eigenvalues ​​are divided into ±6.8307. Compared with the case 1, the equivalent asynchronous damping coefficient algorithm proposed in this paper can be used to retain the damping effect of the damper windings at the same time as using the reduced-order model, so as to better maintain the stability. Analyze the correctness of the results. It should be pointed out that the above-mentioned equivalent asynchronous damping coefficient is only determined for a variety of operating modes. If more than one mode of operation is involved, then a number of equivalent asynchronous damping coefficients corresponding to each operating mode must be calculated and used. 3.2 System simulation calculation under the action of large perturbation In the above system, the branch between nodes 2 and 3 is composed of two lines with the same parameters, and when the phase of the return line node 3 on the side of the switch line, phase permanent short circuit failure occurs 0.128. When cutting off the fault, 24 corresponds to the above-mentioned situation 13.5 is the case where the fault is removed in the case 2 and the load of the No. 1 node 40 and the No. 90 unit are connected together. In the middle, the vertical axis is the relative power angle, and the unit is. The horizontal axis is time and the unit is 3. From 2 we can see that the units in the system can keep running synchronously. However, it eventually loses synchronization. In this conclusion, Yu Yaonan must be countered. Dynamic power system early. Beizu Water Power Press, 1985 Xi'an Jiaotong University. Power system calculations. Beijing Hydraulic Power Press, 1978. Responsibility editor Zhang Zhongshi, Fire Rated Doors,Residential Fire Rated Doors,Fireproof Door,Fire Resistant Door Foshan QI'AN Fireproof Shutter Doors Co., Ltd , https://www.fsqianfiredoor.com