Calculation method of available transmission capacity for power grid scheduling
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A technology of power transmission capacity and calculation method, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems that ATC cannot fully guarantee the accuracy, cannot respond to scheduling needs, and the constraints are not very comprehensive.
Active Publication Date: 2013-03-27
CENT CHINA GRID +1
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Problems solved by technology
The existing ATC calculation methods use the continuous power flow method to determine the ATC. The model generally used in this type of method is the load change model, but this type of model cannot reflect the real-time scheduling requirements; the inequality constraints considered at the same time generally cannot or only Transient stability constraints can be considered, but the constraints considered are not very comprehensive, so the calculated ATC cannot fully guarantee the accuracy
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Embodiment 1
[0051] A method for calculating the available transmission capacity for grid dispatch, the method comprising the following steps:
[0052] a) In a power grid with m+n+1 nodes, there are m PQ nodes, n PV nodes, and 1 balance node (He Yangzan et al., Power System Analysis (Part 2). Wuhan: Huazhong University of Science and Technology Press, 2002 Year.pp.52-53); Divide m+n+1 nodes into two regions, A and B. There are N1 generator sets in A region, and N2 generator sets in B region. All power transmission between A region and B region The collection of lines is called the transmission section, and the active power of the transmission section flows from area A to area B;
[0053] b) Set the initial value of the power grid in step a): set the active power of the generator at each node , reactive power , where if the jth node does not have a generator, it is assigned a value of 0; set the load active power of each node , reactive power , where 0 is assigned if the jth node ha...
Embodiment 2
[0083] Depend on figure 1 It can be seen that the system is an 8-machine 36-node system of the Chinese Academy of Electric Power Sciences (Yan Wei, Dynamic reactive power optimization of AC and DC systems, Electric Power System Automation, Issue 10, 2009). Among them, the number of PQ nodes is m=32, the number of PV nodes is n=3, and the number of balance nodes is 1; the network wiring diagram of the system is as follows figure 1 . like figure 1 Divide as shown, area 1 has 3 generators, area 2 has 5 generators, calculate the available transmission capacity from area 1 to area 2.
[0084] The power grid structure and initial power flow results are initialized according to the structural parameters and operating parameters of the 8-machine 36-node system of the China Electric Power Research Institute. step=0.1, =20, =0.000001; =0.8p.u, =1.05p.u; =4 assignment, is the active power of the i-th transmission line, N=33;
[0085] Use the method of Embodiment 1 to ca...
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Abstract
The invention discloses a calculation method of available transmission capacity for power grid scheduling, relating to the operation and the scheduling of a power system, which is an improved continuous power flow method. The calculation method of the invention is characterized in that the calculation method is dependent on the continuous power flow method; the current state is taken as an initial point; when moving forward to a new state point by controlling the step length, a thermal stabilization constrain, a transient state stability constrain and a node voltage constrain in engineering application after N-1 are verified; the step length is changed and a new predicted position is updated if the requirements cannot be satisfied; and the new state point is confirmed by utilizing Newton iteration until the section power difference between two state points meets the conditions of convergence. The invention has the advantages that the established available transmission capacity calculation model is accurate and flexible; the considered constrain conditions and the calculation model can be selected according to the requirements of users; the processing method for various constrains is more accurate so as to guarantee the reasonability of the available transmission capacity calculation; and the method can be applied to the available transmission capacity calculation of large-scale interconnected networks.
Description
technical field [0001] The present invention relates to power grid dispatching, in particular to a calculation method for available power transmission capacity for power grid dispatching. Background technique [0002] Due to the uneven distribution of power resources in our country, long-distance large-capacity power transmission accounts for a large proportion in our country; coupled with the increase in electricity load year by year, some parts of the power grid have been operating on the edge of their safety limits; in addition, the occurrence of various natural disasters , making the power grid close to the limit more crisis-ridden. Therefore, under the limit operation mode of the power grid, the calculation of the available transmission capacity of the power grid is the basis for ensuring the safe and reliable operation of the power grid. Economics of grid operation. [0003] Available Transmission Capability (ATC - Available Transfer Capability) refers to how much po...
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