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Harmonic pollution power distribution network reconstruction method based on forward/backward scanning harmonic power flow

A distribution network and harmonic power flow technology, applied to AC network circuits, AC networks with the same frequency from different sources, electrical components, etc., 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 efficient problem solving, easy expansion, and high computing efficiency

Active Publication Date: 2020-12-25
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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  • Harmonic pollution power distribution network reconstruction method based on forward/backward scanning harmonic power flow
  • Harmonic pollution power distribution network reconstruction method based on forward/backward scanning harmonic power flow
  • Harmonic pollution power distribution network reconstruction method based on forward/backward scanning harmonic power flow

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Embodiment

[0093] Simulation experiments are carried out in IEEE standard 69 bus radial distribution network, and the method proposed by the present invention is evaluated. Total harmonic distortion (THD) and total network loss in the network bus are considered as evaluation metrics.

[0094]

[0095]

[0096]

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

[0098] Example research network as attached figure 2 , is a 12.66kV IEEE standard distribution network. The basic configuration of the system is a single power supply point, 69 bus bars, 7 side lines, 68 branches, 5 circuits or connection switches (switches 69-73), as shown by the dotted line in the figure. The total load of the basic configuration is 3802.19kW, 2694.6kvar. The network ...

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Abstract

The invention discloses a harmonic pollution distribution network reconstruction method based on forward / backward scanning harmonic power flow. The method comprises the steps of: inputting load network data; constructing a connection matrix, calculating the sum of each column, and judging whether the load network has an available tail end bus or not; starting from the tail end bus, determining endbranch current and flow direction according to the load of the tail end bus, then ignoring the tail end bus and branches connected with the tail end bus, updating a connection matrix, and adding theignored branch current to the corresponding sending tail end bus; according to a forward / backward scanning method, determining a branch flow direction while detecting the annular structure, wherein the harmonic voltage drop of each bus relative to the first bus corresponds to the harmonic voltage of the bus, and calculating to obtain the harmonic voltage of the load network; calculating a bus harmonic voltage from the perspective of the load according to the connection load impedance of the specified harmonic frequency; performing simulation analysis to obtain voltage total harmonic distortion; and performing power distribution network reconstruction. According to the method, the radial topology of the network is considered, and compared with an existing method, the method has higher calculation efficiency.

Description

technical field [0001] The invention relates to the technical field of fast reconfiguration of a harmonic pollution distribution network, in particular to a method for reconfiguration of a harmonic pollution distribution network based on forward / backward scanning of harmonic currents. Background technique [0002] Power system power flow calculation is a common calculation in power system, which can calculate the steady-state operation state of complex power system network under various conditions. Including node voltage and power distribution level etc. This technology can be used to check whether each component in the power system is overloaded, whether the voltage of each node meets the requirements, and whether the power distribution is reasonable, power loss, etc. Newton-Raphson power flow technology is of great significance to the design of the proposed new power system and the transient stability analysis of the power system. [0003] Traditional harmonic analysis m...

Claims

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Application Information

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Patent Type & Authority Applications(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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