A large-scale photovoltaic power station harmonic resonance characteristics analysis and suppression method
A technology for photovoltaic power plants and resonance characteristics, applied to AC networks to reduce harmonics/ripples, active power filtering, etc., can solve problems such as low switching frequency, large inverter capacity, and amplify low-order harmonics, and achieve Change the impedance characteristics, achieve harmonic control, and achieve the effect of resonance suppression
Inactive Publication Date: 2016-05-04
HUNAN UNIV +1
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Problems solved by technology
[0008] 2) Large inverter capacity (250kW-700kW), low switching frequency (less than 3kHz)
[0012] 2) Stochastic volatility
The distributed capacitance of the line is easy to resonate to the harmonics in the wide frequency domain. The current suppression method is to compensate the distributed capacitance of the line, which is generally realized by using a parallel passive filter. Although the cost of the passive filter is low, it will also cause resonance itself, which may amplify the low subharmonic, introducing a new resonance point
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[0042] The concrete realization process of the present invention is as follows.
[0043] 1) Modeling of transmission network
[0044] Under certain conditions, the transmission line part can be replaced by a π-type equivalent circuit. The part of the photovoltaic power station can be equivalent to a current source. Then in the fundamental wave domain, the single-phase equivalent circuit of the power station and transmission system, see figure 2 shown. in, is the system voltage, is the equivalent impedance of the system; and They are system side load and station load respectively; and Y l is the equivalent impedance and admittance of the transmission line; and Respectively, the receiving end and sending end voltage of the line; is the equivalent impedance of the reactive power compensation device in the station; For the step-up variable equivalent impedance, Output current for the power station.
[0045] based on figure 2 , to build a harmonic domain ...
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The invention discloses a harmonic resonance characteristic analysis and restriction method for a large-scale photovoltaic power station. According to the method, a photovoltaic power station power transmission system electrical model is established and utilized for calculating h-th harmonic transmission factor phi h, and whether resonance occurs is analyzed; a resonance restriction method is put forward to achieve restriction of resonance on basis of a traditional injection hybrid active power filter (IHAP). The harmonic resonance characteristic analysis and restriction method for the large-scale photovoltaic power station can provide a theory basis for tasks such as planning and design of a hundred megawatt level photovoltaic power station and a power transmission system, evaluation of capacity of a power grid for receiving the photovoltaic power station, power quality comprehensive treatment of the large-scale photovoltaic power station.
Description
technical field [0001] The invention relates to the technical field of new energy power generation and power transmission, in particular to a method for analyzing and suppressing harmonic resonance characteristics of a large-scale photovoltaic power station. Background technique [0002] The "Global New Energy Development Report 2014" pointed out that in 2013, the total global power generation was 22513.8TWh, a year-on-year increase of 4.3%. Although fossil fuel power generation accounts for 70% of the world's total power generation, new energy power generation continues the trend of rapid growth, with an annual growth rate of 13% year-on-year, accounting for 5.2% of the world's total power generation. In 2013, the new installed capacity of the global photovoltaic market reached 38.7GW, and the cumulative installed capacity reached 140.6GW, of which China's new installed capacity was 12GW, an increase of 232% year-on-year, which was close to the total new installed capacity ...
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IPC IPC(8): H02J3/01
CPCY02E40/20
Inventor 罗安谢宁徐千鸣田园谢龙裕李泽斌王皓
Owner HUNAN UNIV