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A flexible self-starting method for wind storage isolated grid system

A self-starting, energy storage system technology, applied in the direction of wind turbines, wind turbine control, engines, etc., can solve problems such as different power characteristics, and achieve the effects of easy implementation, easy control, and good commercial development prospects

Active Publication Date: 2017-11-03
SHENYANG INST OF ENG
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  • Claims
  • Application Information

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Problems solved by technology

The complexity of this control lies in that, on the one hand, the control strategy must adapt to changes in various operating conditions, such as the state of energy storage, the adjustment state of the fan inverter, the start-up state of the fan, etc. The power characteristics are also different, and their characteristics are also related to the operating status of the wind storage system

Method used

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  • A flexible self-starting method for wind storage isolated grid system
  • A flexible self-starting method for wind storage isolated grid system
  • A flexible self-starting method for wind storage isolated grid system

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Embodiment Construction

[0051] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and simulation experiments.

[0052] figure 1 It is the overall flow chart, which is consistent with the above calculation steps. It is worth noting that it can be seen from the flow chart in the figure that this method is realized by establishing a Petri network model and adding a control signal reflecting the system power deviation in the energy storage control. The flexible self-starting control of the wind storage and isolated grid system is the essential difference from other methods.

[0053] figure 2 It is a schematic diagram of the flexible self-starting Petri network model of the wind storage isolated network system, which is a time Petri network model. A time Petri net can be defined as the following seven-tuple:

[0054] Σ=(P,T,I,O,K,M 0 ,F)

[0055] in:

[0056] ①P={p 1 ,p 2 ,...,p n} is a finite set of places, n≥0; ...

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Abstract

The invention discloses a flexible self-starting method for wind storage isolated network system, and belongs to the fields of grid operation and control technologies. The method is characterized by comprising the following steps: step 1) obtaining operating parameters of the wind storage isolated network system; step 2) determining the number of wind turbine units to be started; step 3) establishing a Petri network based power deviation prediction model of the wind storage isolated network system; step 4) an energy storage inverter performing master-slave control; step 5) adding power deviation control to a frequency control process; step 6) charging an inverter of the wind turbine units by using an energy storage device; step 7) the inverter starting to work to supply an excitation current to the wind turbine unit, and controling a stator voltage and a frequency converter DC voltage to reach nominal values; and step 8) incorporating the wind turbine units into an AC bus of the wind storage isolated network system. The flexible self-starting method adopted by the invention can effectively and reliably enable self-starting of the wind storage isolated network system, thereby providing a technical basis and a practical method for stable operation of the wind storage isolated network system.

Description

technical field [0001] The invention relates to a flexible self-starting method of a wind storage isolated grid system, in particular to a flexible self-starting method of a wind storage isolated grid system based on a Petri network control mechanism, belonging to the technical field of power grid operation and control. Background technique [0002] The traditional power grid faces huge challenges in the centralized access and operation of new energy. On the one hand, limited by factors such as the transmission capacity of the power grid and the requirements for stable operation, the power grid has insufficient capacity to accept new energy; at the same time, the access of new energy has changed the power grid. The comprehensive load characteristics affect the security of the power grid, and there is no effective countermeasure at present. Isolated grid operation is an effective form of new energy decentralization and small-scale application, and it is also an effective supp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/28F03D7/00
CPCF03D7/00H02J3/28H02J3/386Y02E10/72Y02E10/76Y02E70/30
Inventor 叶鹏刘宝贵赵志刚腾志飞戴宪滨王刚赵毅
Owner SHENYANG INST OF ENG
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