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Improved adaptive droop control-based island alternating current-direct current hybrid microgrid power flow calculation method

A technology of AC-DC hybrid and power flow calculation, which is applied in the direction of AC network, AC network circuit, electrical components and other directions with the same frequency from different sources, and can solve the problem of Jacobian matrix singularity and so on

Active Publication Date: 2019-03-19
STATE GRID GASU ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the isolated island AC / DC hybrid microgrid system, each distributed power supply usually adopts peer-to-peer droop control. There are multiple balanced nodes in the system, and the unbalanced power is shared by multiple balanced nodes, and the resistance of the line in the microgrid system cannot Much smaller than the reactance, these factors may lead to the singularity of the Jacobian matrix

Method used

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  • Improved adaptive droop control-based island alternating current-direct current hybrid microgrid power flow calculation method
  • Improved adaptive droop control-based island alternating current-direct current hybrid microgrid power flow calculation method
  • Improved adaptive droop control-based island alternating current-direct current hybrid microgrid power flow calculation method

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Embodiment 1

[0098] Such as Figure 1 to Figure 2 As shown, the power flow calculation method for islanded AC / DC hybrid microgrid based on improved adaptive droop control mainly includes the following steps:

[0099] 1) Build an AC-DC hybrid microgrid. The IEEE-33 node power distribution system and the Benchmark low-voltage micro-grid are slightly modified to make it an island AC-DC hybrid micro-grid system. The system is as follows: figure 1 shown.

[0100] 2) Establish the AC / DC hybrid microgrid control model, mainly including the droop control model of AC distributed power supply, the droop control model of DC distributed power supply, the control model of connected converter, the load model considering the frequency / voltage characteristics and the improved automatic Adapted droop control model.

[0101] When the AC subnet adopts the peer-to-peer control strategy, the AC distributed power supply usually adopts the P-f / Q-U droop control characteristic, and the AC distributed power sup...

Embodiment 2

[0193] An experiment to verify the power flow calculation method of islanded AC / DC hybrid microgrid based on improved adaptive droop control mainly includes the following steps:

[0194] 1) Set the experimental parameters of the isolated island AC-DC hybrid microgrid, namely: η 1 =0.25, η 2 =0.75, γ 1 = 4, γ 2 =0.25, θ=0.5, β 0 =0.005, β min =10 -8 . All droop control DG devices contain reactive power compensation equipment, the no-load voltage amplitude is 1.06pu, and the no-load voltage frequency of AC P-f / Q-U droop control DG devices is 1.004pu. The parameters of the drooping DG device are mainly shown in Table 2.

[0195] AC subsystem parameter setting: system reference power is 1MVA, reference frequency is 50Hz, steady-state frequency range is [0.996,1.004]pu, and the voltage phase angle of node 39 is the reference phase angle. The reference power of the DC subsystem is 100kVA. ILC device parameter setting: U ILCdc.max , U ILCdc.min 1.06pu and 0.94pu respective...

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Abstract

The invention discloses an improved adaptive droop control-based island alternating current-direct current hybrid microgrid power flow calculation method. The method mainly includes the following steps that: 1) an alternating current-direct current hybrid microgrid control model is established; 2) an alternating current-direct current hybrid microgrid power flow model is established; 3) a trust domain-based LMTR solving algorithm is established; and 4) an alternating iteration method is adopted to calculate the power flow of the island microgrid alternating current-direct current hybrid system, and a convergence criterion refers to an relational expression described in the descriptions of the invention, if power flow calculation converges, then the method goes to the step 5, if the power flow calculation does not converge, iteration continues until the power flow calculation converges; and 5) a power flow calculation result is outputted, and load active power is changed, an improved adaptive droop control strategy is adopted to update a droop control coefficient, and the power flow is re-calculated. With the method of the invention adopted, the stability of frequencies and voltagescan be maintained; when power disturbance occurs in the system, it can be ensured that all distributed power sources are outputted according to a power source capacity ratio, a condition that the output of a single power source exceeds a limit when overload occurs can be avoided, and the safe, stable, reliable and efficient operation of the system can be maintained.

Description

technical field [0001] The invention relates to the field of grid-connected new energy sources, in particular to an island AC-DC hybrid micro-grid power flow calculation method based on improved adaptive droop control. Background technique [0002] Under the current background of energy shortage and environmental degradation, microgrids are increasingly recognized and developed by scholars at home and abroad. Microgrid is a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, loads, monitoring and protection systems, etc. It can realize an autonomous system of self-control, protection and management. Microgrid can not only solve the flexible access and efficient operation of large-scale distributed power, and provide power to users in remote areas, islands and deserts, but also an important way for future smart distribution networks to achieve self-healing, user-side interaction and demand re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06H02J3/38
CPCH02J3/06H02J3/381H02J2203/20
Inventor 唐俊杰杨勇舒铜林星宇刘福潮秦睿杨云郑晶晶梁福波张建华彭晶
Owner STATE GRID GASU ELECTRIC POWER RES INST
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