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Energy internet oriented AC/DC hybrid microgrid coordination optimization control method and system

A technology of AC-DC hybrid and Energy Internet, which is applied in the field of energy Internet-oriented AC-DC hybrid micro-grid coordination and optimization control. Issues such as smooth and seamless switching of DC hybrid microgrid

Inactive Publication Date: 2019-04-26
STATE GRID SHANDONG ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the traditional control strategy, multiple interface converters adopt the same current or voltage control method, and there is no way to realize the smooth and seamless switching between the island operation and the grid-connected operation of the AC-DC hybrid microgrid, and there is no way to realize the AC / DC hybrid microgrid. Power quality services such as harmonic compensation and three-phase unbalance suppression of DC hybrid microgrid

Method used

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  • Energy internet oriented AC/DC hybrid microgrid coordination optimization control method and system
  • Energy internet oriented AC/DC hybrid microgrid coordination optimization control method and system
  • Energy internet oriented AC/DC hybrid microgrid coordination optimization control method and system

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Experimental program
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Embodiment 1

[0069] figure 1 It is a structural diagram of a three-phase AC-DC hybrid microgrid group, which consists of multiple sub-microgrids. Each sub-microgrid is composed of two interface converters connected to the AC bus and the DC bus. The energy storage battery and the DC load are directly connected to the DC The busbar, AC load, photovoltaic power generation, and wind power generation can be connected to the DC busbar or the AC busbar. The local loads of the AC-DC hybrid microgrid cluster are connected to the grid connection point (PCC point). When the sub-microgrid is connected to the grid, the voltage of the PCC point is determined by the voltage of the large grid. When the switch CB2 is turned off, the sub-microgrid changes from the grid-connected operation mode to the island operation mode.

[0070] The energy interaction between the DC bus and the AC bus is realized through the coordinated control of the two interface converters in each sub-microgrid. The schematic diagr...

Embodiment 2

[0114] Specific embodiments of the present invention are:

[0115] The method disclosed by the present invention is verified by experiments, and the power control characteristics of the sub-microgrid using static virtual impedance in the grid-connected operation mode are as follows: Figure 4 As shown, the active power reference setting of converters 1 and 2 is 22.5kW, and the reactive power reference setting of converters 1 and 2 changes stepwise from 11.25kVar to 22.5kVar in 3.0 seconds. With static virtual impedance, due to the higher line impedance, the power response of converter 2 is slower, so the sub-microgrid does not enter the steady state until 4.3 seconds.

[0116] On the other hand, if Figure 5 As shown, the power control performance of the interface converter II is effectively improved by adopting the adaptive virtual impedance, and the dynamic power response of the sub-microgrid is reduced to 0.3 seconds.

[0117] The adaptive virtual impedance adjustment pro...

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Abstract

The invention relates to an energy internet oriented AC / DC hybrid microgrid coordination optimization control method and system, and belongs to the technical field of the energy internet and microgrids. The system comprises a plurality of sub microgrids, each sub microgrid consists of two interface converters which are connected with an alternating current bus and a direct current bus, the first interface converter adopts a current control closed loop, the second interface converter adopts a voltage control closed loop based on self-adaptive virtual impedance, and the power deviation of the two interface converters is used as an adaptive setting reference of the virtual impedance of the second interface converter. The first interface converter adopts the strategy of combining the power outer loop control and current outer loop control strategy and the current inner loop control strategy, the second interface converter adopts the strategy of combining the droop control outer loop and the voltage control strategy based on the self-adaptive virtual impedance and the current inner loop control strategy, by coordinated control of the adaptive virtual impedance, the performance of the AC / DC hybrid microgrid is improved.

Description

technical field [0001] The invention relates to a coordinated optimization control method and system for an AC / DC hybrid microgrid oriented to the Energy Internet, and belongs to the technical field of the Energy Internet and the microgrid. Background technique [0002] Microgrid refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, loads, monitoring and protection devices, etc. The proposal of the microgrid aims to realize the flexible and efficient application of distributed power, and solve the problem of grid connection of distributed power and energy storage in a large number and in various forms. The development and extension of micro-grids can fully promote the large-scale access of distributed power and renewable energy, and realize the highly reliable supply of various forms of energy for the load. . [0003] In the context of Energy Internet, with the widespread access ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J5/00
CPCH02J3/38H02J5/00H02J2203/20H02J3/388
Inventor 王瑞琪卢刚张松李文升孙振海王超安树怀刘昊白万建贾亚军李勇李笋吴观斌
Owner STATE GRID SHANDONG ELECTRIC POWER
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