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Improved power flow feasible solution recovering method
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A recovery method and feasible technology, applied in the field of improved power flow feasible solution recovery, can solve problems such as large amount of calculation and difficulty in calculation
Inactive Publication Date: 2011-01-12
TIANJIN UNIV
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[0005] For the second problem, [8] measures the unsolvable degree of power flow by the shortest Euclidean distance between the infeasible operating point and the boundary of the feasible region in the power injection space, and [9] proposes a linear programming model based on sensitivity To restore the power flow solution, the control effect is better, but because this method needs to calculate the left eigenvector of the Jacobian matrix zero eigenvalue, it will be difficult to calculate in a large system; [10-11] treat the power flow solution restoration as a non- The interior point method is used to solve the linear programming problem, and the calculation amount is large when it is applied in a large system; [11] attributed the reason why the power flow has no solution to the weak transmission channel exceeding the transmission power limit, and reduced the load of the weak channel to reduce the load of the weak channel. Restoring the tidal current solution, but this method requires more human participation
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[0121] The example uses two calculation examples of New England-39 node and IEEE-118 node to verify the effectiveness of this method, and the mixed linear programming part calls lingo software to realize. Test computer parameters: Intel Pentium Dual 2.00GHz, memory 2.00GB.
example 1
[0123] Example 1 uses the New England-39 node system [14] , modify the original system parameters as follows:
[0124] 1. Increase the load of load nodes 3, 4, 15, and 16 to 2.7 times of the original, and the increase in load is borne by generators 1, 3, 4, and 8.
[0125] 2. Line 2-3 fails to exit.
[0126] Available controls include:
[0127] 1. The nodes {3, 4, 15, 16} are equipped with switchable reactive power compensation (capacitance and reactance), the number of groups is {2, 1, 3, 2} respectively, and the capacity of each group is 30Mvar.
[0128] 2. The branch circuit where the transformer is located is {6-31, 10-32, 20-34, 2-30}, and its transformation ratio is adjustable, with ±5 steps, and the step size of each step is 0.02.
[0129] 3. The admittance of the line {3-18, 7-8, 16-17, 22-23} is adjustable.
[0130] 4. The generator output of node {33, 34, 35, 36} is adjustable.
[0131] The modified example calculates the divergence by Newton's method. Using th...
example 2
[0140] Example 2 adopts IEEE-118 node system [15] , with Figure 4 It is a one-line diagram of a part of the 118-node calculation example, in which node 100 is connected to the outside. Modify the example as follows:
[0141] 1. Increase the load in this area to 1.5 times of the original and keep the power factor unchanged.
[0142] 2. Lines 100-104, 100-103 are out of service.
[0143] Available controls include:
[0144] 1. All load nodes in the area are equipped with switchable reactive power compensation. Among them, nodes {106, 107} are respectively installed with {2, 1} groups, and other nodes have 3 groups, and the capacity of each group is 30Mvar;
[0145] 2. The admittance of the line {103-104, 103-105, 100-106} is adjustable.
[0146] 3. The output of the generator at the node {103, 111} is adjustable.
[0147] In the modified example, the Newton method is used to calculate the divergence of the power flow, and the optimal multiplier Newton method is used to it...
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Abstract
The invention provides a simple and convenient feasible improved power flow feasible solution recovering method, relating to the on-line safe monitoring of an electric system. The simple and convenient feasible improved power flow feasible solution recovering method comprises the following two substeps of: controlling quantity calculation and result checking which are iteratively carried out in the recovering process: the controlling quantity calculation step comprises the following procedures of: firstly solving a feasible region boundary point of a power injection space by dint of an optimal multiplier power flow, introducing a recovering parameter lambda, and calculating the sensitivity of the lambda on various control measures, and then estimating the adjusting quantity of various control measures on the basis of a sensitivity calculation result through mixed integer linear programming; and the result checking step comprises the following procedures of: verifying control effect through the optimal multiplier power flow, and returning to the controlling quantity calculation step to repeat the step till power flow calculation is convergent when the control measures can not ensure the power flow to be convergent because control strategies formed on the basis of the sensitivity which is the linear approximation of nonlinear relationship often have certain errors. The invention is mainly used for the electric system.
Description
technical field [0001] The invention relates to on-line safety monitoring of a power system, in particular to an improved power flow feasible solution restoration method. Background technique [0002] The rapid development of the power industry, the large increase in load and the pursuit of economy by power companies have made the operating environment of the power system more and more complex. How to ensure its reliability while pursuing economy puts forward higher requirements for the rational planning and online safety monitoring of the power system. [0003] Power flow calculation is an important tool for system personnel in planning and online monitoring. Whether there is a power flow solution under the expected accident conditions is a matter of great concern to the operators. There are two possibilities leading to the divergence of the power flow calculation: one is that the power flow problem itself has a solution and the calculation process diverges due to the pro...
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