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Transient stability control method with asynchronous motor load and related device

An asynchronous motor, transient stability technology, applied in the field of electric power, can solve problems such as transient instability cannot provide control measures

Active Publication Date: 2021-05-11
CHINA SOUTH POWER GRID ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the present application provides a transient stability control method with an asynchronous motor load and related devices, which are used to solve the technical problem in the prior art that control measures cannot be provided for a synchronous generator with an asynchronous motor load when transient instability occurs

Method used

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  • Transient stability control method with asynchronous motor load and related device
  • Transient stability control method with asynchronous motor load and related device
  • Transient stability control method with asynchronous motor load and related device

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Embodiment 1

[0054] see figure 1 , Embodiment 1 of a transient stability control method with an asynchronous motor load provided in the embodiment of the present application includes:

[0055] Step 101 , when a transient instability occurs in the power grid system, obtain the voltage amplitude of the common coupling point of the power grid system.

[0056] When it needs to be explained, the public coupling point voltage is also point of common coupling, PCC, which is defined as the connection point of more than one user load in the power grid, that is, the point where the equipment is connected to the microgrid; when transient stability and transient instability Two relative states, transient stability is the transient stability of the power system, which refers to the ability of each generator to maintain synchronous operation and transition to a new or restore the original stable operating state after the power system is greatly disturbed. This application studies the control measures o...

Embodiment 2

[0065] see figure 2 , the second embodiment of a transient stability control method with an asynchronous motor load provided in the embodiment of the present application includes:

[0066] Step 201. When the type of mechanical load carried by the asynchronous motor is a constant torque mechanical load, determine whether the rotational speed of the asynchronous motor is zero. If so, the power grid system is in a transient instability state; otherwise, the power grid system is in a transient stable state.

[0067] Step 202. When the type of mechanical load carried by the asynchronous motor is a mechanical load proportional to the square of the rotational speed, it is judged whether the rotational speed of the asynchronous motor is half of the rated rotational speed. Transient stable state.

[0068] It should be noted that due to the fact that there are very few studies on the transient instability of synchronous generators with asynchronous motor loads at this stage, it is dif...

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Abstract

The invention discloses a transient stability control method with an asynchronous motor load and a related device, and the method comprises the steps: S1, obtaining the voltage amplitude of a common coupling point of a power grid system when the transient instability of the power grid system occurs; S2, when the voltage amplitude of the common coupling point is smaller than 40% of the rated voltage value of an inverter of the power grid system, calculating the reactive power in the steady state and the reactive power in the locked-rotor state of an asynchronous motor in the power grid system; S3, based on a reactive power reference value calculation formula, calculating a reactive power reference value according to the reactive power in the steady state and the reactive power in the locked-rotor state; and S4, after the reactive power of the inverter is increased according to the reactive power reference value, judging whether the power grid system is in a transient stable state, if so, stopping calculation, and otherwise, returning to the step S1. The technical problem that in the prior art, control measures cannot be provided when transient instability happens to the load of a synchronous generator with an asynchronous motor is solved.

Description

technical field [0001] The present application relates to the field of electric power technology, in particular to a transient stability control method and a related device with an asynchronous motor load. Background technique [0002] In order to solve the increasingly serious environmental and energy problems, the penetration rate of distributed generation units in the power grid is increasing. The microgrid can effectively integrate distributed power generation units and solve the problem of safe and stable operation of distributed power due to fluctuations and intermittences. However, when the microgrid operates in an isolated island, compared with the synchronous generators in the power system, due to the characteristics of limited capacity, fast response speed and insufficient inertial support of each distributed generation unit, the transient stability problem of the island microgrid becomes increasingly prominent. [0003] At this stage, the research on the transien...

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Application Information

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IPC IPC(8): H02J3/16H02J3/50
CPCH02J3/16H02J3/50Y02E40/30
Inventor 喻磊谈赢杰徐敏郭作刚白浩周长城胡巨
Owner CHINA SOUTH POWER GRID ELECTRIC POWER RES INST