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INVENTION
Russian Federation Patent RU2035821
METHOD OF WORK power plants based on renewable
Energy sources in power systems
Name of the inventor: Zharkov SV
The name of the patentee: Siberian Energy Institute of SB RAS
Address for correspondence:
Starting date of the patent: 1991.07.01
Use: in the energy sector, renewable energy. The essence: the power system providing electricity accumulation, its issuance is made in periods of peak load. Energy storage produced by thermal power plants in the period semipeak minimum electrical loads in the power system.
DESCRIPTION OF THE INVENTION
The invention involves the use of renewable energy sources (RES) in electric power systems.
There are technical proposals, in which electricity generated at renewable energy sources (wind, wave, photovoltaic power plants, etc.), Is fed directly into the power grid. This raises the problem of ensuring power quality caused by the instability of the flow of energy in the source (wind force changes, the intensity of the emotion, the flow of light energy, etc.). To smooth the vibrations generated power and coordination of the latter with the regime used the energy battery power consumption: flywheels, electric batteries, vozduhoakkumuliruyuschie installation, pumped storage plant (PSP), etc. Thus, there is a proposal (which is taken as a prototype) to supply electric power from renewable energy systems for PSP on using special electric lines, and thus the stored energy of the water is then used in the hydrogenator, producing electrical energy in the system as needed. In this case it is enough to ensure the quality of electricity (ie sinusoidal, voltage, frequency and power) operating conditions of pumps, motors, and consumers will have a stable electricity from hydro-generator.
But this does not solve the problem of a reliable supply of electricity to consumers, as smoothed a minute, hourly, daily, weekly, at best, vibrations generated by the flow of energy. Annualised same section of such stations have to reserve a special power (eg diesel), operating in the season of insufficient intensity of renewable energy, which is essentially a duplication of capacity and greatly increases the cost of released electric power at the expense of not only the additional cost of fuel, but also investments in back-up power.
The purpose of the invention, improving power efficiency by eliminating redundant power plants on renewable power specially constructed for that station (ie, the power of duplication).
To this end, the installation of renewable energy in the energy system by accumulating its power in the battery and the subsequent issue of electricity to the grid, the battery is reloaded during the failure of the schedule of electrical loads from semipeak power electric power system (EPS), which allows you to use as a backup already exist in the system relatively high-efficiency plant, which at night is usually discharged the load and therefore have spare capacity.
Because at any time of the year in the power system in the period of low electrical loads (at night), there is spare capacity, the proposed method provides a year-round backup power settings on renewable energy, which has daily regulation of energy the battery.
For carrying out the process is necessary to ensure technical equipment (power line, power switch, etc.) the ability to connect the battery to the electrical installation of the network to pre-charge, and a cover of the load stations semipeak grid having at this time the free capacity. In this case the electric power from the battery can be used in any part of the schedule of electric load: peak, semi-peak, base.
The drawing shows a schematic diagram of the station realizing the proposed method.
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The station includes a photovoltaic power generation on renewable energy 1 2 battery power, electrical switches 3 and 4 as well and the power line, linking the station elements among themselves and with the EPS. |
INSTALLATION WORKS AS FOLLOWS
In the period of high electric load the battery 2 through the switch 4 outputs the electric power to EPS. Login battery at this time is connected with the switch 3 to setting 1, to replenish reserves of energy in the accumulator 2.
In periods of low electrical loads battery input 2 is disconnected from the installation 1 and is connected via switches 3 and 4 to the EPC for a few hours for topping up in such a way that by the time morning surge of electrical load the battery is fully charged. Load increase in EPS is covered semipeak stations having at this time the free capacity.
Battery 2 may have an additional (second row) input to connect specifically to the EPS. Then the plant 1 is connected continuously to the first input of the battery.
The duration of pre-charge is determined by the degree of charge of the battery power. For example, if the battery at the time of the failure of the schedule of electric load is fully charged, it is not connected to the grid at all stations and all semipeak discharged as usual for the whole period of low electrical loads that night.
Thus, based on the proposed method of the maximum share of RES stations in EPS is determined by the presence of semipeak stations on organic fuel their power should be enough to fully charge the batteries of these stations for the period of the failure of the electrical load schedule.
Although the use of battery power is to some extent redundant power but the proposed method fulfills the battery once two important functions: smoothes fluctuations, including high-frequency, voltage and power of the electricity generated by the installation RSE i.e. energy storage is required in any case; avoids additional duplication of reserving power stations. Thus, based on the proposed method, when administered to the grid station RES (energy accumulator), it fully covers the part of the graph of electrical loads. There is no need for additional investment on the redundancy of its capacity for this purpose by means of energy storage already existing high-efficiency (eg, steam and gas) semipeak power system equipment which is idle or not fully utilized during the night. This increases the efficiency of power supply as well as the cost of redundancy only poured fuel costs. While in the prior art there are also the costs of building duplicate stations (mainly diesel) or probabilistic nature of power generation stations to renewable energy is dampened due to the reserve power system. In the latter case, firstly, there is a hard limit on the share of renewable energy in the energy system (see, for example, Perfilov OL Shavarin VN Wind:. Problems and Solutions // Power building, 1989, N 10, p.16. -21) and, second, reduced power system reserve, which is fraught with considerable economic losses in case of emergency situations.
Thus, the implementation of the proposed method allows to store energy generated by renewable energy sources to the station during the day, while smoothing out fluctuations and its power, and to use this energy in the form of a stabilized coating of electrical loads; improve the efficiency of electricity supply using renewable energy by eliminating the duplication of power stations to renewable energy by double (better compared to the prototype) used as energy storage and grid stations semipeak.
CLAIM
METHOD OF WORK power plants based on renewable energy sources in electric power systems, including accumulation of electricity generated by this plant, and issuing it to the grid during periods of peak load, characterized in that during periods of shutdown of the power plant of the energy accumulator to accumulate it is produced from thermal semipeak grid power between the minimum electrical loads therein.
print version
Publication date 14.02.2007gg
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