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Minimum current stress control method of voltage source converter of virtual synchronous motor

A technology of virtual synchronous motor and voltage source converter, which is applied in the direction of converting AC power input to DC power output, electrical components, and output power conversion devices, can solve the negative impact of not considering the operating loss of the converter station, reduce Considering the influence of AC/DC hybrid power distribution, increasing the operating loss of the converter station, etc., to achieve the effect of improving frequency stability and voltage stability, small fluctuation range and reducing cost

Active Publication Date: 2018-01-23
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

The transmission of active and reactive power increases the line current, which in turn increases the operating loss of the converter station
On the other hand, the existing virtual synchronous machine control method of the converter station adjusts the frequency of the weak AC system through the virtual speed control system, adjusts the voltage of the weak AC system through the virtual excitation, and rarely considers large disturbances such as faults in the AC-DC hybrid power distribution. The impact on the converter station itself does not consider the negative impact of reactive power support on the operating loss of the converter station during a fault

Method used

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  • Minimum current stress control method of voltage source converter of virtual synchronous motor
  • Minimum current stress control method of voltage source converter of virtual synchronous motor
  • Minimum current stress control method of voltage source converter of virtual synchronous motor

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings, specific implementation methods and examples.

[0039] Such as figure 1 As shown, the present invention calculates the virtual rotor angle δ through the virtual synchronous motor control algorithm v and virtual motor internal electromotive force E t , according to the virtual rotor angle δ v with the virtual rotor angle E t , design the minimum current stress control module per unit power of the virtual synchronous motor, and then realize the minimum current stress control of the converter through the decoupling control of the current inner loop and the drive of the power electronic switch. It is mainly divided into the following three steps.

[0040] Step 1: Calculate the virtual rotor angle δ through the virtual synchronous motor control algorithm of the voltage source converter v and virtual motor internal electromotive force E t

[0041] The VSC virtual synchro...

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Abstract

The invention relates to a minimum current stress control method of a voltage source converter of a virtual synchronous motor. A virtual rotor angle deltav and a virtual motor internal electromotive force Et are calculated by a virtual synchronous motor control algorithm; according to the virtual rotor angle deltav and the virtual motor internal electromotive force Et, a unit-power minimum currentstress control module is designed; and then minimum current instructions i<*>sdmin and i<*>sqmin are provided for an inner loop current decoupling control loop of a converter to obtain a modulation signal so as to drive a power electronic switch of the converter. Therefore, the minimum current stress control of the converter is realized.

Description

technical field [0001] The invention relates to a control method for a voltage source converter of an AC and DC system. Background technique [0002] Distributed renewable energy generation, electric vehicles, and energy storage units are generally connected to the power distribution system through grid-connected inverters, especially power electronic devices such as voltage source converters. The intermittent and random characteristics of renewable energy power generation and electric vehicle charging and discharging have many impacts on the dynamic characteristics, power quality, voltage and frequency regulation, and protection of active power distribution systems. Due to the lack of natural inertia of power electronic devices relative to synchronous generators, when a part of distributed power generation units, energy storage and loads form a local AC system, the rotating reserve, moment of inertia and oscillation damping in the operation of the system will be weakened, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/537H02J3/38
Inventor 叶华唐亚南裴玮孔力
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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