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Synchronous frequency resonance suppression method for distributed energy grid-connected system

A distributed energy, synchronous frequency technology, applied in the direction of reducing/preventing power oscillation, harmonic reduction devices, AC network circuits, etc., can solve the problems of complex modeling and limited application scenarios, achieve the ability to suppress synchronous frequency resonance, reduce cost, the effect of ensuring safe and stable operation

Active Publication Date: 2022-05-31
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some resonance compensation methods, such as state feedback decoupling control methods, reactive power compensation, over-current limitation, etc., have various deficiencies, such as too complicated modeling, limited application scenarios, etc.

Method used

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  • Synchronous frequency resonance suppression method for distributed energy grid-connected system
  • Synchronous frequency resonance suppression method for distributed energy grid-connected system
  • Synchronous frequency resonance suppression method for distributed energy grid-connected system

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Embodiment

[0079] In this example, if Figure 5 As shown, a method for suppressing synchronous frequency resonance of a distributed energy grid-connected system according to the present invention includes the following steps:

[0080] S1. Relevant parameters and related model equations of the given distributed energy grid-connected system;

[0081] Given the relevant parameters of the distributed energy grid-connected system:

[0082] In this embodiment, the relevant parameters of the distributed energy grid-connected system are shown in Table 1, and the simulation step size is set to 5e-6s. Fault 1 description: When t=4s, a 0.1pu voltage sag occurs in the power grid, and the simulation time is 10s. Fault 2 description: When t=3s, the unbalanced DC components are superimposed on the three-phase power grid at -2%, 2% and 1%, respectively, and end when t=5s, and the simulation time is 10s. Fault three description: 0.1pu voltage expansion occurs in the power grid at t=0.5s, and the simul...

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Abstract

The invention discloses a synchronous frequency resonance suppression method for a distributed energy grid-connected system, and the method comprises the steps: constructing a mathematical model of an output port of a distributed system, assigning an initial value, and constructing a power and disturbance transfer function through a small-signal model of a virtual synchronous machine controller; on the basis, by analyzing the influence of system impedance on a transfer function pole and the amplitude-frequency characteristic of a corresponding Bode diagram, whether synchronous frequency resonance occurs after the distributed system is disturbed by a network side fault and the resonance degree are judged, and suppression is carried out by utilizing a virtual impedance link after the synchronous frequency resonance occurs.

Description

technical field [0001] The invention belongs to the technical field of power systems, and more specifically relates to a method for suppressing synchronous frequency resonance of a distributed energy grid-connected system. Background technique [0002] In order to cope with global climate change, my country will comprehensively promote the large-scale and high-quality development of wind power and solar power generation, adhere to the simultaneous development of centralized and distributed power, and accelerate the construction of wind power and photovoltaic power generation bases. By 2030, the total installed capacity of wind power and solar power will reach more than 1.2 billion kilowatts. In order to make the control characteristics of distributed energy closer to the external characteristics of traditional generators and transplant traditional power grid control, the control method of grid-connected converters based on virtual synchronous machines has been widely used. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/38H02J3/50H02J3/24
CPCH02J3/002H02J3/381H02J3/50H02J3/24H02J2203/20H02J2203/10Y02E40/40
Inventor 易建波井实李坚张真源谷宇杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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