Method for optimizing grid-connected unit excitation difference adjustment coefficient based on minimum overall network loss
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A technology with the smallest adjustment coefficient and net loss, applied in the direction of single-network parallel feeding arrangement, etc., can solve problems such as large randomness and lack of theoretical calculations
Inactive Publication Date: 2014-03-26
STATE GRID GASU ELECTRIC POWER RES INST +1
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[0002] The limitation of the selection of traditional excitation adjustment coefficients is that, for units operating in parallel, in principle, each unit is required to have a positive adjustment at the parallel point and the adjustment coefficients are completely equal in order to ensure the stable operation of the units and the reasonable distribution of reactive power. Desirable adjustment coefficient 3%-5%
However, the
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Embodiment 1
[0046] figure 1 It is a flow chart of the optimization method for the excitation adjustment coefficient of the grid-connected unit based on the minimum network loss of the whole network, as shown in figure 1 As shown, the optimization method provided by the present invention includes:
[0047] Step 1: Establish a power flow calculation model that takes into account the influence of generator excitation adjustment coefficient.
[0048] The relationship between generator terminal voltage and output reactive power is shown in formula (1):
[0049] Q G = 1 R ( U G 0 U G - U G 2 ) - - - ( 1 )
[0...
Embodiment 2
[0075] figure 2 It is a simplified diagram of a certain provincial power grid provided by the embodiment, which includes 22 nodes, among which nodes 1, 5, 8, 20 and 21 are generator nodes.
[0076] First, determine the value of each variable, including the node admittance matrix, the no-load voltage U of the generator node G0k , The active power P of the load node L0i and the reactive power Q at the load node L0i .
[0077] Secondly, given the generator active power P Gk , Excitation adjustment coefficient R k , node voltage amplitude U j and node voltage phase angle δ j initial value.
[0078] Finally, using the optimization objective function established by the present invention, combined with constraints, in MATLAB software, iteratively solved with the help of a numerical solution algorithm, and the results are shown in the following table.
[0079]
[0080] It can be seen from the above table that after optimization, the variation coefficient of generator 1 is ...
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Abstract
The invention discloses a method for optimizing grid-connected unit excitation difference adjustment coefficient based on minimum overall network loss in the technical field of power system analysis and control. The method includes the steps: building a load flow calculation model affecting the generator excitation difference adjustment coefficient; determining a load flow constraint equation; building a grid-connected unit excitation difference adjustment coefficient optimization object function aiming at the minimum overall network loss, and determining constraint conditions of the optimization object function; gaining the optimal solution of the optimization object function according to the load flow calculation model and the load flow constraint equation to obtain the optimized excitation difference adjustment coefficient. The method overcomes the shortcoming that a traditional method determines the difference adjustment coefficient by experience, stable voltage is ensured, and the economic benefit of a power grid is the highest.
Description
technical field [0001] The invention belongs to the technical field of power system analysis and control, and in particular relates to an optimization method for excitation adjustment coefficient of a grid-connected unit based on the minimum network loss of the entire network. Background technique [0002] The limitation of the selection of traditional excitation adjustment coefficients is that, for units operating in parallel, in principle, each unit is required to have a positive adjustment at the parallel point and the adjustment coefficients are completely equal in order to ensure the stable operation of the units and the reasonable distribution of reactive power. The desirable adjustment coefficient is 3%-5%. However, the selection of the traditional excitation adjustment coefficient is only roughly in the range of 3%-5%, but the specific selection is often based on experience and lacks specific theoretical calculations. At the same time, because the traditional excita...
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