KR20130091957A - The wind power system using street lights(gearless type) - Google Patents

Abstract

PURPOSE: A gearless type wind power generation system utilizing street lights is provided to reuse wasted air (wind) which passes through between street lights. CONSTITUTION: A gearless type wind power generation system utilizing street lights comprises a support stand, a blade unit, a generating unit, a battery, and a safety device. The support stand is installed on a street light to be connected to a wind power generation device. The wind power generation device is unmovably fixed on the street light, and maintains a body. The blade unit is composed of blades which are rotated by the wind which passes through between street lights.

Description

The wind power system using street lights (Gearless type)}

The present invention relates to an alternative energy system for producing electricity by installing wind power in a street light, and more particularly, by installing a gearless wind power device in a street light to convert the passing air (wind) into an energy source. It is about renewable energy technology that produces power.

Wind power is a power generation technology that generates electricity by converting wind energy. The wind system consists of "mechanical parts, electric parts, control parts".

The mechanical part is a blade that produces rotational force from wind, a rotor including a shaft, a gearbox that converts it to an appropriate speed, and a brake to improve starting, braking and operating efficiency. It is composed of control devices such as pitching system and yawing system.

The electric device part is constituted by a power stabilizing device which supplies a generator and other stable electric power.

Control system is composed of control system and yawing controller which is set up and operated to enable unmanned operation of wind turbine generator, active control of output by controlling the pitch of the blade, And a monitoring system that enables control and determination of the state of the system on the ground.

Wind turbine systems are composed of various types.

[Table 1] shows the types of wind turbine systems.

[Table 1] Types of wind turbine systems

When the wind turbine system is divided along the direction of the rotating shaft, it is divided into a vertical axis generator and a horizontal axis generator. Vertical-axis generators have no relation to the direction of the wind, so they can be installed in desert or plains, but they are expensive and inefficient compared to horizontal axis windmills. The horizontal axis generators are simple to install because they are simple to install but they are influenced by the wind direction. Generally, a horizontal axis generator is used for medium to large scale class and a vertical axis generator is used for small class of 100kW or less.

The wind turbine system is classified into a geared type and a gearless type according to the operation mode. Most wind turbines are geared wind turbines using constant-speed induction generators and are equipped with gears that increase the rotational speed of the rotor to match the high rated revolutions of the induction generator.

The Gearless type corresponds to a wind power generation system using a variable-speed operation synchronous (or permanent magnet) generator, and is a direct-drive type in which a rotor and a generator are directly connected to each other without a speed-increasing gear unit using a multi-pole synchronous generator. Although the power generation efficiency is high, it is more expensive than the induction generator and has a large size.

Because wind turbines have higher wind speeds and larger wind turbines can produce more wind energy, the amount of power generated by wind turbines depends on the strength of the wind and the size of the windmill. Also, as the height increases, the wind blows harder, so the generator in the higher place is larger than the generator in the lower place and the generation amount is also higher. For wind power generation, winds blowing at an average speed of more than 4 m / s are required. The velocity of the wind referred to here is not the ground on which we stand, but the speed at which the wind generator is at its wing.

The effects of wind power generation are as follows.

First, the effect of replacing fossil fuels with power generation method using wind kinetic energy is very high.

Secondly, it is possible to supply economical power to the underdeveloped areas such as the islands.

Third, land use can be streamlined by installing in coastal and mountainous areas with excellent wind direction.

Fourth, in some specific areas such as Jeju region, large scale wind farm complexes can be used as tourism resources.

Because wind power generation uses pollution-free and infinite winds scattered everywhere, it has little impact on the environment and can utilize the land efficiently. In the case of large-scale power generation complexes, Is a new energy generation technology. In addition, the area actually used in the wind farm is only 1% of the total area of the whole area including the foundation of the wind turbine, the road, the measurement and the central control room, and the remaining 99% Can be used. In general, the area required for power generation is wind power 1,335 m2 / GWh, coal 3,642 m2 / GWh, solar heat 3,561 m2 / GWh, and solar power generation 3,237 m2 / GWh. Wind power generation is very effective in reducing pollutants, so if a 200 kW wind turbine generates a power of 400,000 kWh for one year, it will replace about 120-200 tons of coal. -3.2 tons of NOx, 1.2-2.4 tons of CO2, 300-500 tons of CO2, 16-28 tons of slag and ash, and the emission of suspended solids is about 160-280 kg per year. . The price of wind power generation system varies depending on the wind resource of the installation area. However, the large-scale wind farms in the US currently have a system installation cost of about $ 750 / kW and a power generation cost of about 5 ¢ / kWh. It is competitive. Moreover, if continuous investment and technology development are combined, wind power generation is expected to achieve 3.9 ¢ / kWh unit price target within 15 years. Since the technology related to wind power generation is already in practical use stage, it tends to concentrate on lowering the price of wind power generators and increasing the size and spread of the wind power generators rather than developing element technology. In many countries, wind power generators are being supplied in a competitive manner. By the end of 1994, the world has installed about 3,7600 MW of wind power generators, producing more than 4.5 billion kWh of electricity annually. In 1994, a new wind turbine with a capacity of 611 MW was newly installed, and in India, a wind farm with a size of 235.5 MW was planned to be built in 1995. Currently, the largest number of wind turbines operate in the United States, Germany, and Denmark. In the United States, a large-scale wind farm in California produces about 3 billion kWh of electricity annually in 1993, In 1994, it produced about 3.5 billion kWh of electricity. However, the country with the highest share of wind power is Denmark, which is responsible for 7% of the electricity consumption of 1,135MW from 4900 wind turbines in 1998 and supplies 440,000 households. According to Inara 's "Energy 21" plan, it will raise 10% by 2000 and 50% by 2030. The present state of the domestic technology development was analyzed by the Korea Research Institute of the National Institute of Advanced Industrial Science and Technology (AIST) to analyze the characteristics of wind resources using the statistical data of 64 meteorological stations and measurement data of some parts of the inland area. Due to the nature of the wind resource, which is heavily influenced, the basic statistical data have not been improved yet. Therefore, it is necessary to continue the evaluation of wind power resources in the prospective wind power generation area and the feasibility evaluation project for wind farm construction.

The present invention is a system for producing electricity by installing a gearless (Gearless) wind power generation system to the street lamp, in order to recycle the wind passing between the street lights. It is a new concept of wind power generation system that uses streetlights as a wind source.

"Gearless wind power generation system using street lights" according to the present invention is composed of "support, wing, gearless power generation unit, storage battery, safety device" and the like. As a support for connecting street lamps and wind turbines, a blade driven by wind, a gearless generator and an inverter, and a built-in power generation unit, a storage battery for generating electricity, and a safety device to ensure people's safety. It is characterized by being constructed.

"Gearless wind power generation system using street lights" according to the present invention can be expected the following effects.

First, wasteful energy sources can be recycled. Wasted winds passing between street lights can be recycled.

Second, it has a simple structure, low manufacturing cost, and convenient maintenance.

"Gearless wind power generation system using a street lamp" according to the present invention is composed of "support, wing, gearless power generation unit, storage battery, safety device" and the like.

The support is installed on the street lamp to perform the function of connecting the wind turbine and the street lamp to each other. It is fixed to the street lamp so that the wind turbine can be maintained without moving.

The wing consists of a blade that is rotated by the wind.

The power generation unit is divided into two types, geared and gearless. In case of gear type, the inside is composed of gear increaser and induction generator (constant voltage / constant frequency generation). The blade rotates by the wind passing between the street lamps and the gearbox (gearbox) is operated by the rotation of the blade, which is how the induction generator operates.

In case of gearless type, the inside is composed of multi-pole synchronous generator. In case of gearless type, it is a direct-drive type, so it doesn't need gearbox. On the other hand, because it does not match the frequency of the electric field system, an inverter (Inverter) is required to adjust this.

However, in the case of the gear type, an inverter is unnecessary because it can be matched with the KEPCO frequency through an induction generator.

An induction generator is used by reversing the input / output relationship of a three-phase induction motor. In other words, an induction motor draws power from a three-phase power source and draws mechanical output from the shaft, while an induction generator supplies mechanical power to the shaft while the induction motor is connected to the three-phase power source. Is faster than a certain value (this value is determined by the number of poles of the machine and the frequency of the AC power supply), allowing the power to be sent to the three-phase power supply.

A synchronous generator is a generator in which the relative speeds of a rotor and a stator rotate in synchronism with a rotating magnetic field among alternators.

The advantages of the gear type are as follows.

First, it is possible to construct a high reliability power transmission system with low manufacturing cost.

Second, reliability is very high based on long-term technical know-how and experience.

Third, as a universal element technology, it is a universal technology that can be designed and manufactured in any region.

Fourth, maintenance is easy and performance can be easily maintained by replacing parts.

Fifth, grid linkage has simple and easy technical characteristics.

The disadvantages of the gear type are as follows.

First, it may be a mechanical problem of the gearbox or maintenance problems.

Second, it is the cause of mechanical noise generation and can be a major cause of failure.

Third, having a service life within 8 to 10 years, which is usually shorter than 20 years of the service life of the entire system, causes an increase in maintenance costs.

Fourth, it is necessary to improve the power factor by the additional compensation circuit at low power.

The advantages of the gearless type are as follows.

First, many mechanical parts such as gearbox can be removed.

Second, the nutelle structure is very simple and easy to maintain.

Third, mechanical noise is dramatically reduced by eliminating the gearbox.

Fourth, power factor control is possible, and high power factor can be realized regardless of output.

The disadvantages of the gearless type are as follows.

First, there is a need for a multipole synchronous generator that is very large, heavy and expensive to manufacture.

Second, the air gap of the multi-pole synchronous generator may be exposed to external air and may be affected by suspended matter such as salt and dust, and it is absolutely necessary to secure safety in electrical insulation.

Third, there is a structural problem to support a large generator in the form of a cantilever.

The power generation unit has a built-in power regulator to control the electricity generated. The power regulator is a device that allows the wind turbine to produce the maximum power in a given condition.

The storage battery stores electricity generated by the generator of the wind power generator so that the battery can be used where necessary. Batteries can use products of various capacities and voltages as needed.

Claims (1)

It consists of "support, wing, power generation unit, storage battery, safety device", etc., and the support is installed in the street light to perform the function of connecting to each other and the wind generator, and fixed to the street light does not move the wind generator To maintain the body;
The wing consists of a blade rotating by the wind passing through the street lamp;
Inside the power generation unit (in case of gearless type), a multi-pole synchronous generator is built-in, and an inverter (Inverter) is built in to adjust this because it does not match the frequency of the electric field system. Is built in, the power regulator is a device that can produce the maximum power in a given condition;
A battery is a "gearless type wind power generation system using street lamps" that is configured to store electricity generated by a generator of a wind turbine so that it can be used where needed.