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Photovoltaic parallel network device having reactive and harmonic compensation function

A harmonic compensation and photovoltaic technology, applied in output power conversion devices, photovoltaic power generation, circuit devices, etc., can solve the problems of high cost and single function of photovoltaic power generation devices

Inactive Publication Date: 2005-08-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The primary purpose of the present invention is to propose a photovoltaic grid-connected device with both reactive power and harmonic compensation functions and active power output functions to improve the cost performance of photovoltaic grid-connected devices in view of the shortcomings of current photovoltaic power generation devices, which are high in cost and single in function

Method used

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  • Photovoltaic parallel network device having reactive and harmonic compensation function
  • Photovoltaic parallel network device having reactive and harmonic compensation function
  • Photovoltaic parallel network device having reactive and harmonic compensation function

Examples

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Embodiment 1

[0029] see Figure 9 The overall schematic diagram of the three-phase photovoltaic grid-connected device shown, the inverter adopts figure 1 The three-phase two-level inverter bridge shown. The whole device is mainly composed of a photovoltaic array (9), an inverter main power circuit (800), an output filter inductor (3), and a DSP control board (400). Construct a three-phase two-level photovoltaic grid-connected device with 25kVA and active power of 15kW (peak power of the photovoltaic array). If it is incorporated into the three-phase 380V distribution network, the composition of the photovoltaic array (9) is as follows:

[0030] The photovoltaic array (9) also has a peak power of 16.65kW and an open circuit voltage of 851V;

[0031] 222 solar cells with a peak power of 75W and an open circuit voltage of 23V are required;

[0032] Use 37 pieces in series to form a column, and then connect 6 columns in parallel to form the photovoltaic array required by the first embodime...

Embodiment 2

[0034] According to the design of embodiment one, see figure 1The overall schematic diagram of a three-phase photovoltaic grid-connected (with transformer) device using a two-level topology is shown. Two-level topology three-phase photovoltaic grid-connected device (with transformer) is mainly composed of photovoltaic array (9), two-level inverter (100), output filter inductor (3), grid-connected transformer (11), DSP control board ( 400) composition. Build a 15kW (PV array peak power) three-phase photovoltaic grid-connected device. If a transformer is used to connect to the three-phase 380V distribution network, and the primary side of the transformer is connected to the grid, the secondary side is connected to the output filter inductor of the three-phase photovoltaic grid-connected device. (3), the transformation ratio is 2:1. The photovoltaic array (9) is composed as follows:

[0035] The photovoltaic array (9) also has a peak power of 17.1kW and an open circuit voltag...

Embodiment 3

[0041] The photovoltaic grid-connected device with multi-level structure is suitable for use in large-capacity devices and integrated into medium and high voltage power grids. image 3 A photovoltaic grid-connected installation with a three-phase three-level inverter is shown. It contains:

[0042] A three-phase bridge (200) is composed of three single-phase bridge arms A, B, and C connected in parallel, and each single phase is composed of four IGBT single-tube transistors connected in series with inverting diodes, and each bridge arm is connected in series The point is used as the output end of the three phases, and is connected in series with each of the above-mentioned three-phase inductances (3);

[0043] A bus capacitor, which is composed of two electrolytic capacitors (231) and (232) connected in series, and the bus capacitor is connected in parallel to the DC side of the above-mentioned three-level grid-connected inverter;

[0044] A phase, B phase, and C phase have ...

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Abstract

A three-phase photovoltaic interconnected device having both reaction and harmonic compensation function, and belongs to the field of multi-functional photovoltaic interconnected device technology. The characteristic is: the main power circuit of this device is composed of the photovoltaic array, the interconnected inverter and interconnected filter sensor. The structure of the inverter has many kinds of patterns, such as the two level structure, the three level structure, the three-phase generatrix capacitance separated chain structure with transformation, the three-phase union capacitance chain structure with transformation and the chain structure without transformation. This device can emit the power to the electric net, and can in time compensate the reaction and harmonic wave of the current in the net. This invention increases the utilization ratio of the solar battery board of photovoltaic electricity generation, and meanwhile it solves the problem of the working method of the photovoltaic system in the bad lighting conditions, that is, the system will not be left unused and compensate the harmonic wave and reaction of the electric net.

Description

technical field [0001] The invention relates to the design of a multifunctional photovoltaic grid-connected device, belonging to the technical field of multifunctional photovoltaic grid-connected devices. Background technique [0002] With the increasing depletion of traditional energy, the world's energy in the 21st century will undergo tremendous changes. The energy structure dominated by fossil energy with limited resources and serious pollution will gradually transform into a diverse energy structure dominated by clean and clean renewable energy with unlimited resources. Sexual and complex energy structure. Solar photovoltaic power generation is a clean and renewable energy. The development of photovoltaic power generation technology and its wide application play an important role in alleviating the shortage of conventional energy and reducing environmental pollution. Under such a premise, the development and application of solar photovoltaic power generation technology...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCY02E10/563Y02E10/56
Inventor 刘建政王健赵争鸣吴理博刘树
Owner TSINGHUA UNIV
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