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Sequence impedance modeling and stability analysis method of load virtual synchronous machine

A technology of virtual synchronous machine and analysis method, applied in the field of sequence impedance modeling and stability analysis of load virtual synchronous machine

Active Publication Date: 2020-02-07
HUNAN UNIV
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a sequence impedance modeling and stability analysis method of a load virtual synchronous machine in view of the deficiencies in the prior art, which solves the problem of considering DC voltage controllers, reactive power controllers, active power controllers, AC Difficulties in modeling small-signal impedance of load virtual synchronous machines under the influence of current controllers and frequency coupling of positive and negative sequence disturbances

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  • Sequence impedance modeling and stability analysis method of load virtual synchronous machine
  • Sequence impedance modeling and stability analysis method of load virtual synchronous machine
  • Sequence impedance modeling and stability analysis method of load virtual synchronous machine

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Embodiment Construction

[0048] figure 1 is the main circuit topology of the load virtual synchronous machine. Among them: Q 1 -Q 6 constitutes a load virtual synchronous machine three-phase rectifier bridge; v dc i dc are the DC side voltage and current of the load virtual synchronous machine, respectively; e a 、e b and e c is the internal potential of the load virtual synchronous machine; v a , v b and v c is the grid-connected point voltage of load virtual synchronous machine; i a i b , and i c is the AC input current of the load virtual synchronous machine; v ga , v gb and v gc is the grid voltage, i ga i gb and i gc is the grid current; R L is the equivalent resistance of DC side load; C dc is the DC side capacitance; L f 、C f and R f are the AC filter inductor, filter capacitor and damping resistor respectively; L g and R g are the equivalent line inductance and resistance of the grid, respectively.

[0049] figure 2 It is the control block diagram of the load virtual ...

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Abstract

The invention discloses a sequence impedance modeling and stability analysis method of a load virtual synchronous machine. Influences of a direct-current voltage controller, a reactive power controller, an active power controller, an alternating-current controller and positive and negative sequence disturbance frequency coupling of a load virtual synchronous machine are comprehensively considered,a harmonic linearization method is adopted to establish an accurate sequence impedance model of a load virtual synchronous machine, so a problem of small signal impedance modeling of the load virtualsynchronous machine under the influence of multi-loop control and frequency coupling is solved. The influence of different power grid impedances on the stability of a grid-connected system of the load virtual synchronous machine is analyzed by utilizing the established sequence impedance model of the load virtual synchronous machine, the established power grid impedance model and the establishedNyquist stability criterion. Analysis results show that the load virtual synchronous machine can still operate stably under the condition of large power grid impedance, namely a weak power grid, and does not interact with the power grid easily to generate oscillation. The invention provides a model and a method for analyzing the stability of the small signal of the load virtual synchronous machineaccessed to the power grid, and popularization and application of the load virtual synchronous machine are facilitated.

Description

technical field [0001] The invention relates to the field of interactive stability between a power electronic converter and a power grid, in particular to a sequence impedance modeling and stability analysis method of a load virtual synchronous machine. Background technique [0002] With the large-scale and high penetration of renewable energy and loads connected to the grid through the interface of power electronic converters, due to the lack of damping and inertia of traditional synchronous motors, it brings a non-negligible problem to the safe and stable operation of the power system. influences. In order to enhance the inertia of the high-proportion power electronic distribution network, not only the new energy grid-connected inverter is required to have the inertia and damping of the traditional motor, but also the power electronic converter on the load side can provide inertia support for the grid and participate in grid regulation autonomously. The load virtual synch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/38
Inventor 周小平刘一锋于浩祺洪乐荣夏海涛朱仁龙舒钰成尹寒航邓凌峰陈斌超
Owner HUNAN UNIV
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