A low-voltage ride-through evaluation method for photovoltaic inverters based on digital-analog hybrid simulation
A low-voltage ride-through and photovoltaic inverter technology, which is applied in the direction of instruments, measuring electricity, and measuring electrical variables, can solve the problems of increasing the inspection workload, increasing the inspection work pressure of the inspection center, and increasing the manufacturer's cost, etc.
Active Publication Date: 2019-08-06
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology
Photovoltaic inverter manufacturers continuously rectify their controllers through type tests. After the rectification is completed, they will participate in the next round of type test queues. This will undoubtedly increase the research and development costs and time of inverter manufacturers. At the same time, for As far as the testing center is concerned, the testing work pressure is also aggravated, which reduces the testing efficiency
Especially for the same series of inverters of the same brand, the topological structure is the same, only the model is different, and the parameters of the components are different. It is also necessary to carry out type test testing, which increases the workload of testing and increases the cost of manufacturers.
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[0045]Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0046] The present invention provides a photovoltaic inverter low-voltage ride-through evaluation method based on digital-analog hybrid simulation, which saves the huge test scale and detection cost of formal testing for each photovoltaic inverter of the same series, and solves the problem of There are many safety hazards and huge costs in the type test of photovoltaic inverters, and it is difficult for the existing evaluation technology to accurately reflect the testing and evaluation problems of the performance of the same series...
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The invention provides a digital-analog hybrid simulation-based photovoltaic inverter low voltage ride through evaluation method. The method includes the following steps that: step 1, low voltage ride through type testing is performed on a tested photovoltaic inverter; step 2, a photovoltaic inverter digital-analog hybrid simulation platform is constructed; step 3, low voltage ride through digital-analog hybrid simulation is performed on the tested photovoltaic inverter; step 4, whether the errors of test data and simulation data satisfy preset maximum deviation is judged; and step 5, the electrical parameters of a photovoltaic inverter in the same series type with the tested photovoltaic inverter are obtained, the model parameters of the photovoltaic inverter digital-analog hybrid simulation platform are modified according to the electrical parameters, low voltage ride through half-physical simulation is performed on the modified photovoltaic inverter digital-analog hybrid simulation platform. Compared with the prior art, the digital-analog hybrid simulation-based photovoltaic inverter low voltage ride through evaluation method provided by the present invention can assist in solving the problems of many hidden dangers and high cost of an existing type test method.
Description
technical field [0001] The invention relates to the detection field of photovoltaic grid-connected inverters, in particular to a low-voltage ride-through evaluation method for photovoltaic inverters based on digital-analog hybrid simulation. Background technique [0002] With the gradual increase of new energy grid-connected power generation scale, more and more new energy grid-connected power generation devices such as photovoltaic grid-connected inverters are connected to the grid, and the performance of their grid-connected characteristics has become a factor that affects the safe and stable operation of the grid. Key factor. Therefore, how to realize the rapid, accurate and efficient detection of the grid-connected characteristics of photovoltaic inverters has become a key link for the smooth grid-connection of photovoltaic power generation. [0003] In photovoltaic grid-connected power generation, since the power generation and output power characteristics of photovolt...
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IPC IPC(8): G01R31/00
Inventor 张军军郑飞黄晶生张晓琳丁杰朱凌志
Owner CHINA ELECTRIC POWER RES INST