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Flexible power distribution network converter fuzzy droop control method considering power margin

A technology of power margin and control method, which is applied in the conversion device of output power, conversion of AC power input to DC power output, adaptive control, etc. The problems of fuzzy converter and unstable system operation can improve the utilization rate of equipment and operation reliability, reduce the risk of exceeding the capacity limit, and maintain the effect of DC voltage.

Pending Publication Date: 2021-08-31
GUIZHOU POWER GRID CO LTD
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  • Abstract
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a fuzzy droop control method for flexible distribution network converters that takes power margin into account, so as to solve the problems of voltage deviation and inverter in traditional droop control in the prior art when the system encounters unbalanced power. The problem that the power margin of the current converter cannot be taken into account at the same time, the power fluctuation and the voltage quality affect each other, and in severe cases, it will lead to technical problems such as system operation instability

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  • Flexible power distribution network converter fuzzy droop control method considering power margin
  • Flexible power distribution network converter fuzzy droop control method considering power margin
  • Flexible power distribution network converter fuzzy droop control method considering power margin

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with accompanying drawings and examples.

[0048] figure 1 It is a DDC-based AC-DC hybrid distribution network system topology, in which 2 AC feeders are connected to the VSC converter through an isolation transformer, and the voltage level of the DDC is ±10kV. And the simulation model of the present invention is constructed according to the block diagram; the DC side in the figure includes a photovoltaic power station and a DC load. Modular multi-level converter MMC is one of the popular VSC topologies used in HVDC and MTDC in recent years. Considering that MMC adopts the nearest level modulation (Nearest Level Modulation, NLM) modulation method, it can reduce switching frequency and reduce loss , and the output voltage waveform power quality is high, so the MMC converter is used;

[0049] figure 2 The topological structure of MMC is shown, for example, its bridge arms are connected in cascading m...

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Abstract

The invention discloses a flexible power distribution network converter fuzzy droop control method considering a power margin. The method comprises the following steps: optimizing and updating a droop coefficient in real time according to a voltage deviation and the power margin, maintaining the stability of a DC voltage through distributing unbalanced power between feeder lines, and guaranteeing that the transmission power is within the power margin, the capacity overload risk of the converter is reduced, and stable operation of the system is realized. The unbalanced power is reasonably distributed among the converters, and the equipment utilization rate and the operation reliability of the power distribution network are improved.

Description

technical field [0001] The invention belongs to the technical field of flexible distribution network control, and in particular relates to a fuzzy droop control method for a converter of a flexible distribution network considering power margin. [0002] technical background [0003] With the continuous increase of distributed generation (distributed generation, DG) access, the rapid popularization of electric vehicles, and the continuous increase of controllable loads, the existing distribution network structure has been difficult to meet the user's requirements for environmental protection and power supply reliability. , power quality and quality service requirements. Flexible distribution network (Flexible Distribution Network, FDN) has high power supply reliability and power flow control ability, and has good coordination and control ability in the face of large-scale DG grid connection and load switching. [0004] "Smart DC Distribution Center (Smart DDC)" forms a flexib...

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Application Information

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IPC IPC(8): H02J3/36H02M7/483G05B13/04
CPCG05B13/042H02J3/36H02M7/483H02J2203/20Y02E60/60
Inventor 张露松刘玉洁欧阳泽宇杨文勇班国邦喻寻刘丽袁旭峰邹雕马晓红李义曾华荣王丰李欣刘君徐舒蓉胡勇
Owner GUIZHOU POWER GRID CO LTD
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