Static safety risk assessment method for AC-DC hybrid micro-grid in island operation

An AC/DC hybrid and risk assessment technology, applied in the field of power system analysis, can solve problems such as easy singularity of the Jacobian matrix

Pending Publication Date: 2019-10-15
XIANGTAN UNIV
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Problems solved by technology

In the island operation AC-DC hybrid microgrid under the droop coordinated control strategy, each subsystem has no balance node and contains DG devices with droop control, which makes the Jacobian matrix of the power flow equation easy to be singular, and th

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  • Static safety risk assessment method for AC-DC hybrid micro-grid in island operation
  • Static safety risk assessment method for AC-DC hybrid micro-grid in island operation
  • Static safety risk assessment method for AC-DC hybrid micro-grid in island operation

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Embodiment Construction

[0112] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0113] figure 1 Step-by-step flowchart of static security risk assessment for AC-DC hybrid microgrid for island operation, including the following steps:

[0114] Step 1: Carry out N-1 open-circuit fault simulation for an island-operated AC-DC hybrid microgrid with a given topology;

[0115] Step 2: Carry out decoupling analysis to obtain the island system after fault decoupling and the unrecoverable de-energized load in the fault area;

[0116] Step 3: According to the established probability distribution model of random faults of interconnected converters and distributed power devices, random output of intermittent distributed power devices, and random load fluctuations, Monte Carlo sampling is performed to obtain random input variables for the Mth sampling sample value;

[0117] Step 4: Carry out partition load shedding calculation for the is...

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Abstract

The invention discloses a static safety risk assessment method for an AC-DC hybrid micro-grid in island operation. The method comprises the following steps of: simulating the N-1 open-circuit fault ofthe AC-DC hybrid micro-grid in island operation with a given topology; performing a disconnection analysis to obtain an island system with the fault disconnected and the unrecoverable power loss loadin a fault area; establishing a probability distribution model of the random failure of an interlinking converter and a distributed generation device, the random output of an intermittent distributedgeneration device, and the load random fluctuation, performing Monte Carlo sampling to obtain a random input variable sample value; performing regional load-shedding operation on the island system toobtain the power loss load in a non-fault area, and performing conventional power flow calculation by using an accelerated LM algorithm with non-monotone linear search (ALMNL); and obtaining the probability distribution of each static safety risk indicator. The method of the invention can assess the static safety risk level of the AC-DC hybrid micro-grid in island operation, is an effective method for researching the static safety reliability of the AC-DC hybrid micro-grid in island operation, and provides technical support for the planning and operation of the AC-DC hybrid micro-grid.

Description

technical field [0001] The invention relates to the field of power system analysis, in particular to a static security risk assessment method for an AC / DC hybrid microgrid operating in an isolated island. Background technique [0002] The AC-DC hybrid microgrid structure includes the AC subsystem (AC busbar), the DC subsystem (DC busbar) and the interlinking converter (ILC) connecting the AC and DC subsystems. The AC-DC hybrid microgrid combines the AC microgrid The advantages of the two structures of power grid and DC microgrid can directly supply power to AC loads and DC loads, reducing unnecessary power conversion. It is the most promising microgrid structure in the future and has become a hot spot for academic research and engineering demonstration. The AC / DC hybrid microgrid has two operation modes: grid-connected operation and island operation. The island operation AC-DC hybrid microgrid using the droop coordination control strategy lacks the support and regulation of...

Claims

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Application Information

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IPC IPC(8): H02J3/02
CPCH02J3/02H02J2203/20
Inventor 彭寒梅魏宁王小豪
Owner XIANGTAN UNIV
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