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Pattern analysis-based photovoltaic power station multi-unit system low-frequency oscillation suppressing method

A photovoltaic power station, low-frequency oscillation technology, applied in photovoltaic power generation, single-grid parallel feeding arrangement, etc., to achieve the effect of suppressing low-frequency oscillation and reducing complexity

Inactive Publication Date: 2018-01-12
NANJING UNIV OF SCI & TECH
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  • Pattern analysis-based photovoltaic power station multi-unit system low-frequency oscillation suppressing method
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  • Pattern analysis-based photovoltaic power station multi-unit system low-frequency oscillation suppressing method

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Embodiment

[0143] In order to verify the effectiveness of the proposed photovoltaic wide area controller, the DIgSILENY / PowerFactory software is built as figure 1 A two-zone system with a photovoltaic plant is shown. Among them, the photovoltaic power station adopts the multiplication equivalent value of a single machine, and its active output is 180MW. The synchronous generator G2 is selected as the balancing machine, and each synchronous generator is equipped with Type 1 AVR and Type 1 GOV, both of which are equipped with PSS. Area 1 delivers 400MW of active power to Area 2. The main oscillation modes are found by mode analysis, as shown in Table 1. It can be seen that the system contains three main low-frequency oscillation modes, modes 1 and 2 are the local oscillation modes of area 1 and area 2 respectively, and the dominant mode is mode 3, manifested as G1 and G2 in area 1 and G3 and G4 in area 2 The mutual swing between them is a typical weakly damped interval mode.

[0144] T...

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Abstract

The invention discloses a pattern analysis-based photovoltaic power station multi-unit system low-frequency oscillation suppressing method. The pattern analysis-based photovoltaic power station multi-unit system low-frequency oscillation suppressing method comprises the steps of 1) establishing a grid-connected photovoltaic power station dynamic model comprising a photovoltaic array, an inverter and a control module of the inverter; 2) establishing a photovoltaic power station-contained multi-unit power system state equation and a linearized model of the photovoltaic power station-contained multi-unit power system state equation; 3) taking a four-unit two-area system as an analyzing example to perform pattern analysis on the linearized model; 4) designing a photovoltaic wide-area damping controller. The pattern analysis-based photovoltaic power station multi-unit system low-frequency oscillation suppressing method can effectively achieve damping control of a photovoltaic power generation system, reduce negative effects on system safety and stability levels which are possibly led to by photovoltaic grid connection, and improve receptivity of an interconnected electric power system to the photovoltaic power generation system.

Description

technical field [0001] The invention belongs to the technical field of new energy grid connection, in particular to a method for suppressing low-frequency oscillation of a multi-machine system by a photovoltaic power station based on mode analysis. Background technique [0002] my country's photovoltaic power generation technology mainly presents two methods: "large-scale decentralized development, low-voltage access, and local consumption" and "large-scale centralized development, medium and high-voltage access, and high-voltage long-distance transmission and consumption". The impact on security and stability is more significant. On the basis of studying and discussing the influence of large-scale photovoltaic grid-connected on the low-frequency oscillation of the power system, the active regulation of photovoltaic power plants is used to improve the system damping characteristics. Traditional synchronous generators mainly suppress low-frequency oscillations by adding PSS t...

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 王宝华白凡周荣冯爱成刘宁
Owner NANJING UNIV OF SCI & TECH
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