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All-pure embedded load flow calculation method and device based on constant item values and prior nodes

A technology of power flow calculation and constant value, applied in the field of power system, it can solve problems such as affecting power flow convergence, and achieve the effects of good power flow convergence performance, improvement of convergence problems, and high calculation accuracy.

Active Publication Date: 2022-04-12
国网内蒙古东部电力有限公司通辽供电公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Literature [7] further demonstrated from the mathematical point of view that the HEM based on Approximate analytical continuation method, without considering the computer rounding error, when the power series calculation order is too high Approximate pseudo-zero-pole pairs (Froissart doublets phenomenon) will affect power flow convergence

Method used

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  • All-pure embedded load flow calculation method and device based on constant item values and prior nodes
  • All-pure embedded load flow calculation method and device based on constant item values and prior nodes
  • All-pure embedded load flow calculation method and device based on constant item values and prior nodes

Examples

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Embodiment 1

[0035] A holomorphic embedded power flow calculation method based on constant values ​​and prior nodes, see figure 1 , the method includes the following steps:

[0036] 101: According to the characteristics of different types of nodes in the power system, construct a holomorphic embedded power flow model based on constant term values, and set the upper limit n_max of power series order calculation and the initial constant term value of each node voltage Take it as the value of the power series constant term of the holomorphic function of each node voltage, and calculate the initial constant term value of the current to obtain the power series coefficients of higher-order terms;

[0037]102: According to the characteristics of the holomorphic function, replace the holomorphic function with a power series, and derive the coefficient V of the higher-order term of the power series of each holomorphic function from the property that the coefficients of the power series on both s...

Embodiment 2

[0045] The scheme in embodiment 1 is further introduced below in conjunction with specific calculation formulas and examples, see the following description for details:

[0046] 201: Set the power series order calculation upper limit n_max and the initial constant value of the voltage Calculate the initial constant value of the current

[0047]

[0048] In the formula, node b is any node, In order to remove the symmetric part of the nodal admittance matrix after the ground admittance is removed, is the initial constant value of current at node b, is the initial constant term value of the voltage of node k (using traditional HELM voltage power series constant term value of each node), N is the total number of nodes.

[0049] 202: Construct CHELM models of different types of nodes based on the set initial constant value of voltage and current;

[0050] Wherein, step 202 mainly includes:

[0051] 1) PQ node CHELM model:

[0052]

[0053] In the formula, α is the...

Embodiment 3

[0095] The following combined with specific examples, Figure 2-Figure 7 , and Table 1-Table 4, carry out feasibility verification to the scheme in embodiment 1 and 2, see the following description for details:

[0096] First, in order to verify the accuracy and versatility of the present invention, the power flow calculation results of the proposed CHELM, P-CHELM and the traditional HELM and NR method in different scale test systems are compared. For the NR method, the power flow calculation started by Ruoping does not converge , the initial value provided by MATPOWER is used for calculation. The calculation accuracy of the calculation example is 10 -03 (i.e. 0.001, the following descriptions are similar and will not be repeated), the upper limit of the power series order n_max=12, and the approximate calculation of Padé all adopts the Bauer's Eta method. CHELM calculations are used for systems with 300 nodes and below, and P-CHELM calculations are used for large-scale test...

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Abstract

The invention discloses a full-pure embedded load flow calculation method and device based on a constant item value and a prior node, and the method comprises the steps: calculating the load flow of a power system according to a full-pure embedded load flow model based on the constant item value, calculating the initial voltage approximation values of all nodes if the voltage approximation value of the prior node meets the internal circulation precision, and calculating the initial voltage approximation values of all nodes; calculating node injection complex power and power unbalance, if the power unbalance meets the power flow precision, comparing the reactive power output of the PV node with the limit value of the PV node, and selecting a scheme to convert the node type and initialize voltage and current constant values when an out-of-limit condition exists; otherwise, continuing to calculate a higher-order power series coefficient, updating a priori node voltage approximation value, repeating the step until the power series order reaches the upper limit, calculating voltage re-approximation values of all nodes, and updating voltage and current constant values. The device comprises a processor and a memory. Accurate and rapid calculation of large-scale power system power flow is achieved, and the node type conversion strategy is correct and feasible.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method and device for calculating a purely embedded power flow based on constant value and prior nodes. Background technique [0002] Power flow calculation is the basis of power system security and stability analysis, and the power flow calculation method based on Newton-Raphson method (Newton-Raphson, NR) has been widely used in power system [1] . However, the local convergence characteristics of the NR method make this method more sensitive to the selection of initial values. Unreasonable initial values ​​in actual calculations will lead to non-convergence of the calculation results; There is no power flow solution for the system in this operating mode [2] . Aiming at the problems existing in the NR method in power system power flow solution, Spanish scholar Dr. Antonio Trias first proposed in 2012 the preliminary idea of ​​applying the Holomorphic Embedding Method (HEM) to s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06H02J3/48H02J3/50H02J3/24
Inventor 于泽龙梁帅赵新力袁在吉曹志刚丁仁杰冷长山张翼翔姚超凡李曙光王长江
Owner 国网内蒙古东部电力有限公司通辽供电公司