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Synchronous inverter virtual power pre-synchronization control method considering RoCoF

A technology of synchronous inverter and virtual power, applied in AC network circuits, electrical components, circuit devices, etc., can solve problems such as excessive frequency deviation and frequency change rate, and reduce system frequency stability

Pending Publication Date: 2022-03-01
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology

However, this feedback control loop is prone to excessive frequency deviation and frequency change rate (The Rate of Change of Frequency, RoCoF) during the pre-synchronization grid-connected dynamic adjustment process, which often triggers under-frequency load shedding protection or conventional circuit breaker tripping. Greatly reduces system frequency stability

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  • Synchronous inverter virtual power pre-synchronization control method considering RoCoF
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  • Synchronous inverter virtual power pre-synchronization control method considering RoCoF

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Embodiment Construction

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0021] Virtual power pre-synchronization control to construct virtual impedance Z v for the basis. Taking the grid-connected work of a single synchronous inverter as an example, its equivalent model is as follows figure 1 shown. E is the no-load voltage, δ v is the phase or power angle, Z is the output impedance, is the equivalent voltage at the output side of the inverter, U g ∠0° is the grid voltage. Suppose there is a virtual impedance Z between the VSG output side and the grid v , α v is the virtual impedance angle, then the corresponding active and reactive power flowing through the virtual impedance is

[0022]

[0023] It can be seen from the above formula: when the virtual impedance is pure inductance, that is, α v =90°, virtual active power and phase diff...

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Abstract

The invention discloses a synchronous inverter virtual power pre-synchronization control method considering RoCoF, and belongs to the field of low-voltage micro-grid inverter control, aiming at solving the problems of overlarge frequency deviation delta f and frequency change rate (RoCoF) of a synchronous inverter in a grid-connected / off-grid dual-mode dynamic adjustment process. According to the method, an independent virtual power feedback loop is constructed, a pre-synchronization control small signal model is established, the influence of control parameters on the stability of a system is analyzed, and according to an IEEE Standard 154 # power grid synchronization process standard, a parameter design flow is given with frequency deviation delta f, RoCoF and adjustment time as design indexes. According to the method, the synchronous inverter can quickly and effectively realize the pre-synchronous grid connection process without a phase-locked loop structure, the proposed parameter design scheme meets the requirements of frequency deviation and frequency change rate in the power grid synchronization process, and the method has a remarkable effect on improving the system frequency stability.

Description

technical field [0001] The invention relates to the field of inverter control of distributed power generation microgrids, in particular to a virtual power pre-synchronization control method of a synchronous inverter considering RoCoF. Background technique [0002] The proportion of distributed energy connected to the grid has gradually increased, which has greatly alleviated the crisis of traditional fossil energy and the environment. As a port for distributed energy generation to connect to the grid, the inverter undertakes the important work of AC and DC power conversion and off / grid switching. Compared with traditional synchronous generators, inverters composed of power electronic devices cannot continuously provide inertia and damping for the grid, which poses a huge challenge to the security and stability of the grid. In order to further increase the penetration rate of distributed energy generation, the virtual synchronous generator technology (Virtual Synchronous Gen...

Claims

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Application Information

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IPC IPC(8): H02J3/44H02J3/48H02J3/38
CPCH02J3/44H02J3/48H02J3/381H02J2203/20
Inventor 颜湘武马宏斌贾焦心
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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