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Reconstruction method of harmonically polluted distribution network based on forward/backward sweep harmonic power flow

A technology of harmonic power flow and power distribution network, which is applied in the direction of AC network circuits, AC networks with the same frequency from different sources, electrical components, etc., and can solve the problem of slow speed and low accuracy in calculating the harmonic distortion level of distribution network problem, to achieve the effect of improving research accuracy, efficient problem solving, and easy expansion

Active Publication Date: 2022-07-01
国网江苏省电力有限公司滨海县供电分公司 +3
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Problems solved by technology

[0015] In order to solve the problem that the harmonic power flow method in the prior art fails to comprehensively consider all effective parameters, and the calculation of the harmonic distortion level of the distribution network is slow and the accuracy is low

Method used

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  • Reconstruction method of harmonically polluted distribution network based on forward/backward sweep harmonic power flow
  • Reconstruction method of harmonically polluted distribution network based on forward/backward sweep harmonic power flow
  • Reconstruction method of harmonically polluted distribution network based on forward/backward sweep harmonic power flow

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Embodiment

[0093] Simulation experiments are carried out in the IEEE Standard 69 bus radial distribution network to evaluate the method proposed by the present invention. Total harmonic distortion (THD) and total network losses in the network bus are considered as evaluation metrics.

[0094]

[0095]

[0096]

[0097] of which: P Loss is the total power loss of the network, SATHD is the average THD of the network, V i h is the voltage with harmonic order h of bus i, n is the number of buses, L T is the apparent power of the system load, L i is the apparent power of the bus i load.

[0098] Example study network as attached figure 2 , is a 12.66kV IEEE standard distribution network. The basic configuration of the system is a single feed point, 69 busbars, 7 side conductors, 68 branches, 5 loops or connection switches (switches 69-73) as shown in dashed lines. The total load of the basic configuration is 3802.19kW, 2694.6kvar. The network consists of 2 capacitor banks, lo...

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Abstract

Harmonic pollution power distribution network reconstruction method based on forward / backward sweep harmonic power flow, input load network data; build a connection matrix, calculate the sum of each column, and judge whether the load network has an available end bus; starting from the end bus, According to the end bus load, determine the end branch current and flow direction, then ignore the end bus and its connected branches, update the connection matrix, and add the ignored branch current to the corresponding sending end bus; according to the method of forward / backward scanning , determine the flow direction of the branch while detecting the ring structure; the harmonic voltage drop of each bus relative to the first bus corresponds to its harmonic voltage, and the harmonic voltage of the load network is calculated; from the perspective of the load, according to the specified harmonic order The load impedance of the connection is calculated, and the bus harmonic voltage is calculated; the simulation analysis is performed to obtain the total harmonic distortion of the voltage; the distribution network is reconstructed. The method of the present invention considers the radial topology of the network, and has higher computational efficiency compared with the existing method.

Description

technical field [0001] The invention relates to the technical field of rapid reconstruction of a harmonic pollution power distribution network, in particular to a harmonic pollution power distribution network reconstruction method based on forward / backward scanning harmonic power flow. Background technique [0002] Power system power flow calculation is a common calculation in power system, which can calculate the steady-state operating state of complex power system network under various conditions. Including node voltage and power distribution level, etc. Using this technology, it is possible to check whether each component in the power system is overloaded, whether the voltage of each section meets the requirements, whether the power distribution is reasonable, and whether the power loss occurs. The Newton-Raphson power flow technology is of great significance to the design of the power system to be built and the transient and steady state analysis of the power system. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/10H02J2203/20
Inventor 胡桂荣李海峰刘继赵飞郭林川杨青伟徐云旭
Owner 国网江苏省电力有限公司滨海县供电分公司
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