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Renewable energy generating, power transmission and transformation and electrical network access integrated system

A renewable energy, power transmission and transformation technology, applied in the field of integrated systems, which can solve the problems of long distance, easy disconnection, and low low voltage ride through capability of photovoltaic inverters.

Inactive Publication Date: 2014-02-26
梁一桥
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although wind power generation has been widely used, there are still the following problems: 1) Wind power has significant randomness and intermittency, and the generated electric energy is relatively unstable, requiring frequent adjustment of other types of generating units (such as thermal power generating units) 2) Most wind turbines have low low-voltage ride-through capability, and they are easy to disconnect from the grid when a short-circuit fault occurs in the large power grid and the system voltage drops. It will cause a strong impact on the power grid and pose a great danger to the safe and stable operation of the large power grid; 3) The construction cost of the step-up substation platform of the offshore wind farm is high; 4) Due to the influence of the capacitor charging current, the transmission capacity of the high-voltage submarine AC 5) Many wind farms are far away from the large AC power grid, and the long-distance transmission capacity is greatly limited
[0008] Similar to wind power generation, solar photovoltaic power generation has the following problems: 1) Solar farms are greatly affected by seasons, day and night, and weather, and have significant randomness and intermittency. The generated power is relatively unstable and requires frequent Adjusting the power generation output of other types of generator sets (such as thermal power generator sets) to balance the load of the grid greatly reduces the economical efficiency of this type of unit operation; 2) Some photovoltaic inverters have low low-voltage ride-through capabilities. A short-circuit fault in the large power grid causes the system voltage to drop easily off the grid, causing a strong impact on the power grid and posing a great danger to the safe and stable operation of the large power grid; Far, long-distance transmission capacity is greatly limited

Method used

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  • Renewable energy generating, power transmission and transformation and electrical network access integrated system
  • Renewable energy generating, power transmission and transformation and electrical network access integrated system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Example 1: as Figure 4a As shown, the electromagnetic isolation type DC / DC converter includes a low-voltage side full-bridge inverter composed of IGBT or MOSFET and its DC capacitor, an LC series resonant circuit composed of an inductance Lr and a capacitor Cr, a multi- The high-frequency transformer of the secondary coil and multiple high-voltage side rectifier circuits. The high-voltage side rectifier circuit is composed of a diode full-bridge rectifier circuit and its DC side output filter circuit. The output filter circuit can be a capacitor or an LC filter circuit. The inductance Lr can be a separate inductance element or the leakage inductance of the high-frequency transformer; the DC end of the low-voltage side full-bridge inverter is used as the input of the electromagnetic isolation DC / DC converter The terminal is connected in parallel with the low-voltage DC bus LVDC, and the AC terminal of the low-voltage side full-bridge inverter is connected in series wit...

Embodiment 2

[0082] Example 2: as Figure 4b As shown, the electromagnetic isolation DC / DC converter includes a low-voltage side full-bridge inverter composed of IGBT or MOSFET and its DC capacitor, an LLC resonant circuit composed of inductor Lr, inductor Lm and capacitor Cr, A high-frequency transformer with multiple-stage coils and multiple high-side rectifier circuits. The high-voltage side rectifier circuit is composed of a diode full-bridge rectifier circuit and its DC side output filter circuit. The output filter circuit can be a capacitor or an LC filter circuit. The inductance Lr can be a separate inductance element or the leakage inductance of the high-frequency transformer, and the inductance Lm can be a separate inductive element or the excitation of the high-frequency transformer. inductance. The DC terminal of the low-voltage side full-bridge inverter is used as the input terminal of the electromagnetic isolation type DC / DC converter in parallel with the low-voltage DC bus ...

Embodiment 3

[0083] Example three: as Figure 4c As shown, the electromagnetically isolated DC / DC converter includes a low-voltage side full-bridge inverter composed of IGBT or MOSFET and its DC capacitor, an LCC resonant circuit composed of an inductor Lr, a capacitor Cp and a capacitor Cr, A high-frequency transformer with multiple-stage coils and multiple high-side rectifier circuits. The high-voltage side rectifier circuit is composed of a diode full-bridge rectifier circuit and its DC side output filter circuit. The output filter circuit can be a capacitor or an LC filter circuit. The inductance Lr may be a separate inductance element, or may be the leakage inductance of the high-frequency transformer. The DC terminal of the low-voltage side full-bridge inverter is used as the input terminal of the electromagnetic isolation type DC / DC converter in parallel with the low-voltage DC bus LVDC, and the AC terminal of the low-voltage side full-bridge inverter is connected to the LCC resona...

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Abstract

The invention relates to a renewable energy generating, power transmission and transformation and electrical network access integrated system, for the purpose of providing an access system capable of preventing impact or trawlnet caused to an electrical network. The technical scheme is as follows: the integrated system comprises renewable energy integrated generating units, at least one high voltage direct current transmission (HVDC) line, at least one inverter and a power generation field computer monitoring system, wherein the output end of each renewable energy integrated generating unit is connected with a high voltage direct current bus; one end of the HVDC line is connected with the high voltage direct current bus; the other end of the HVDC line is connected with the direct current input end of the large-power inverter; the alternating current output end of the large-power inverter is connected with an alternating current large electrical network; the power generation field computer monitoring system is connected with an electrical network dispatching control center and receives dispatching orders; and the power generation field computer monitoring system is also connected with the renewable energy integrated generating units and gives generating set values.

Description

technical field [0001] The invention belongs to the technical field of new energy power generation and power transmission, and in particular relates to an integrated system of renewable energy (wind energy, solar energy) power generation, current conversion, energy storage, power transmission and access to a large AC power grid. Background technique [0002] With the shortage of non-renewable energy sources such as oil, coal and natural gas, and the increasingly serious environmental pollution caused by the use of non-renewable energy sources, countries around the world are paying more and more attention to the development and utilization of renewable and clean energy such as wind energy and solar energy. The proportion of renewable energy power generation has also increased rapidly. [0003] (1) Wind power generation: [0004] The wind farm that captures wind energy, converts it into electrical energy and sends it to the grid through transmission lines is mainly composed o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/34H02J7/35H02J3/38
Inventor 梁一桥梁家诚
Owner 梁一桥
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