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harmonic Oscillations in a Grid-Connected PV Generation Farm Caused by an Increased Number of Parallel-Connected PV Generating Units and Damping Controllers

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CSEE Journal of power and Energy Systems 2020年第6期10卷 2350-2359页

作者： Wenjuan Du Zhicheng Ma Yang Wang H. F. Wang School of Electrical Engineering Sichuan University Chengdu China Electric power Research Institute State Grid Gansu Electric Power Co. Ltd. Lanzhou China

This paper examines the harmonic oscillations in a grid-connected PV generation farm (PVGF) caused by the parallel connection of an increased number of PV generation units (PVGUs). An equivalent model of the grid-connected PVGF is derived, which clearly explains why there are internal and external oscillation modes in the grid-connected PVGF. An indicator of impedance multiplication (IIM) is proposed to quantitatively estimate the impact of the increased number of PVGUs in parallel connection. The analysis in this paper reveals the mechanism about why the damping of external oscillation modes may decrease when more PVGUs are in parallel connection under the condition that the IIM is positive. An example grid-connected PVGF is presented in this paper to demonstrate and evaluate the derived analysis and conclusions. A method for designing the damping controllers to ensure a negative IIM is proposed. With the damping controllers being installed, the risk of growing harmonic oscillations caused by the increased number of the PVGUs in parallel connection can be effectively eliminated.

关键词： Oscillators power system stability harmonic analysis Wind farms State-space methods power harmonic filters power system dynamics

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Design of an Active Polyphase Filter in GSM Receiver with Low-IF topologies

Design of an Active Polyphase Filter in GSM Receiver with Lo...

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2008 9th International Conference on Solid-State and Integrated-Circuit Technology

作者： Jia-you Song1 2* Xiao-ye Liu1 Zhi-Gong Wang2 1School of Information Engineering Zhengzhou University 450052 Zhengzhou China 2Institute of RF- & OE-ICs Southeast University 210096 Nanjing China School of Information Engineering Zhengzhou University450052 ZhengzhouChina Institute of RF-& OE-ICs Southeast University School of Information Engineering Zhengzhou University

This paper describes the design of a polyphase filter in GSM receiver with low-IF topologies, using the circuit scheme of active-RC with the performance of single chip integrated. Based on TSMC 0.18um CMOS process the Spectre simulation results indicate that the filter is centered at 110 kHz with 200 kHz of bandwidth. It has a voltage gain of about 30dB, an image rejection ratio of about 38dB. The power consumption is 4.2mW under a 3V power supply.

关键词： [IEEE Keyword]GSM Microwave filters power harmonic filters Gain Receivers Band pass filters Filtering theory

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