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Power generation, power transformation and grid connection method for clean energy field

A clean energy, primary energy technology, applied in wind power generation, parallel operation of DC power supply, electrical components, etc., can solve the complex, complex, repetitive construction, mutual influence, uneconomical, etc. of generator motion control and power waveform control problems, to achieve the effect of satisfying low voltage ride through, simplifying motion control links, and improving power supply quality

Inactive Publication Date: 2022-06-03
张长增
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, wind power, solar energy, and tidal energy are all unstable energy sources, and sometimes they are complementary. To extract and convert extremely discrete energy sources into electrical energy, and to consume or store energy at a long distance, a more economical method is needed to surf or store
The existing mining and utilization technologies are basically still in the original state of discrete local area network application. The wind turbine also adopts three-phase control and requires synchronization with the alignment. The motion control and power waveform control of the generator are quite complicated. The output of each generator set 690V low-voltage electricity, there is a 35kV transformer step-up in the machine position, a wind farm has countless small-capacity three-phase step-up transformers, and then the three-phase power flows to the central hub station to continue to step up to UHV, so multiple substations , multiple losses, complex configuration, repeated construction, mutual influence, etc., do not meet the economics of large-scale mining and utilization
[0005] In the existing technology, the biggest waste is that on the basis of wind turbines, the high-quality three-phase electric energy that is not needed is produced at a high cost, and finally, the three-phase is changed back to single-phase DC UHV output. To put it bluntly, there is no need to strictly manage the voltage waveform, phase, frequency, etc. in the middle process, but the traditional technical standards and supply chain lead to too much inaction in the middle

Method used

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  • Power generation, power transformation and grid connection method for clean energy field

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Experimental program
Comparison scheme
Effect test

Embodiment 1

The wind turbine sends out 1kV single-phase pulsating DC power, which is sent to the central buffer storage battery of the energy field. The photovoltaic power generation is also set to an output DC of 1kV, which is also sent to the central buffer storage battery of the local energy field. Then, the inverter boost system will This buffer storage battery 1kV power supply inverter boost is a standard 35kV three-phase AC power that is synchronized with the large power grid. There are N units of this inverter booster device, each with a capacity of P. For this, the N units of 35kV three-phase AC power are then merged to A main transformer with a power of NP is boosted to 220kV through a three-phase transformer without inverter. It is then incorporated into the backbone network through relays. Such an energy field can have a total capacity of more than 100MW or even 1GW. This is good for power dispatching, and N 35kV three-phase transformers can be switched or cut one by one. Redu...

Embodiment 2

The wind turbine directly emits 10kV single-phase pulsating DC power, which is sent to the central buffer storage battery of the energy field. There is no three-phase step-up transformer connected to the wind turbine unit, and the photovoltaic power generation voltage is a relatively safe voltage, such as 100V, and then passes through "DC-AC-DC" boosts to 10kV, which is a single-phase converter and outputs DC, which is also sent to the 10kV-level buffer storage battery in the load center of the energy field. Then, the inverter system inverts the 10kV power supply of the central buffer storage battery into a standard three-phase 220kV UHV that is synchronized with the large power grid, and then merges it into the backbone network through a relay. It is also possible to invert the DC of the 10kV buffer storage battery in the load center of the local energy field into a standard ±100kV~±1000kV DC UHV output through the "DC-AC-DC" inverter system. Such an energy field can have a to...

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Abstract

The invention discloses a power generation, power transformation and grid connection method for a clean energy field, which realizes centralized and unified grid connection and long-distance power transmission of energy sources such as wind energy, solar energy and tidal energy, realizes conversion from mechanical energy of a fan to electric energy by a single-phase direct-current generator, or realizes conversion from optical energy to electric energy by a solar battery pack, and then, realizes power generation by a power generation system. And after being buffered and smoothed by the buffer storage battery, the ultra-high-voltage direct current is converted and boosted by the inverter, and then is output after the ultra-high-voltage direct current is converted into ultra-high-voltage direct current. According to the method, unstable energy is collected to a specific buffer area, electric energy quality control of a power generation link of a generator position is omitted, inversion and boosting are concentrated to standard voltage grid connection, and low cost of large-scale energy production and maximum transmission efficiency are achieved.

Description

technical field [0001] The invention discloses a method for power generation, transformation and grid connection of a clean energy field, which belongs to the field of clean renewable energy power generation, and also belongs to the field of electromechanical equipment or machinery manufacturing. Background technique [0003] Improving the earth's atmospheric environment, reducing greenhouse gas emissions, advocating the use of wind and solar energy and limiting the use of fossil energy are the mainstream of contemporary energy technology. Therefore, the collection and utilization of natural resources such as wind power, solar power, tidal power and so on have more and more practical significance and economic benefits. [0004] However, wind power, solar power, and tidal power are all unstable energy sources, and sometimes they are complementary. To extract and convert extremely discrete energy sources into electrical energy, and consume or store them in long distances, a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02J1/14H02J1/08
CPCH02J1/10H02J1/14H02J1/08H02J2300/28H02J2300/24Y02E10/76
Inventor 张长增
Owner 张长增