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Method of solving problem of photovoltaic energy consumption by using heat storage system

A heat storage system and heat storage technology, applied in photovoltaic power generation, photovoltaic thermoelectric hybrid power generation, photovoltaic modules, etc., can solve the problems of short life, high cost of battery energy storage system, mismatch between power generation output and load characteristics, etc. The effect of reducing power purchase cost, optimizing and dispatching heat storage operation status, and improving heat supply characteristics

Inactive Publication Date: 2017-12-08
SHANGHAI ELECTRIC POWER DESIGN INST
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many reasons for the serious problems of wind and solar curtailment, but the most fundamental reason is that the power generation output does not match the load characteristics, and real-time power balance cannot be achieved. After the conventional adjustment methods are exhausted, wind power and photovoltaic power rationing have to be curtailed.
Battery energy storage is an ideal device to solve this problem. It can be regarded as both a means of regulating power and a means of regulating load. To achieve commercial application, it is currently only used as a demonstration project in some projects, such as the Zhangbei National Wind and Photovoltaic Transmission Demonstration Project

Method used

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  • Method of solving problem of photovoltaic energy consumption by using heat storage system
  • Method of solving problem of photovoltaic energy consumption by using heat storage system
  • Method of solving problem of photovoltaic energy consumption by using heat storage system

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Embodiment

[0039] like figure 1 , figure 2 As shown in the figure, the figure shows the typical heat load curve, photovoltaic output characteristic curve and grid dispatchable input power curve of Suzhou District, Gansu Province during the heating period. The following methods are used to screen the optimal dispatch strategy for heat storage:

[0040] Step (a) establish a mathematical model of electric heating:

[0041] The electric heating power depends on the size of the heating load and the power of the heat storage. The mathematical expression is:

[0042] P e2h =P hload +P hs

[0043] In the formula, P e2h is the electric heating power; P hload It is heat load (has been converted into power supply load); P hs is the heat storage power, the heat storage is positive, and the heat release is negative.

[0044] Step (b) Calculate the heat storage capacity of the heat storage system in the dispatch period:

[0045] The essence of the heat storage system to improve the photovol...

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Abstract

The invention discloses a method of solving the problem of photovoltaic energy consumption by using a heat storage system. The traditional coal-fired heating is changed into electric heating in a photovoltaic surplus area to break the rigid constraint of "ordering power by heat" of a coal-fired co-generation unit, and the space for photovoltaic consumption can be effectively increased. On the basis of electric heating, a heat storage system is adopted, the photovoltaic output characteristics, load characteristics and electricity prices are taken into account, minimizing the cost of heat-supply enterprises in a scheduling cycle is taken as the goal, the scheduling heat storage operation state is optimized, the heat supply characteristics of the heat-supply enterprises are improved from the time dimension, the level of photovoltaic energy consumption is further enhanced and meanwhile the economic benefits of the heat-supply enterprises are ensured.

Description

technical field [0001] The invention relates to the technical field of photovoltaic consumption, in particular to a method for solving photovoltaic electric energy consumption by utilizing a heat storage system. Background technique [0002] my country is currently the country with the largest installed capacity and development speed of wind power and photovoltaics. By the end of 2015, the installed capacity of wind power reached 129 million kW, and the installed capacity of photovoltaics reached 43 million kW. While the vigorous development of renewable energy power generation brings people clean energy, due to the uncontrollability of wind power and photovoltaic power generation, the slowdown in the growth rate of social electricity consumption, and the transmission channel of the power grid, it has led to serious abandonment of wind and light. In 2015, the national wind abandonment ratio reached 15%, and the abandoned light ratio reached 12.6%. The most serious Gansu area...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S40/44H02J3/28
CPCH02J3/28H02S40/44Y02E10/56Y02E10/60Y02E70/30Y02P80/20
Inventor 陈云辉袁智强魏小淤
Owner SHANGHAI ELECTRIC POWER DESIGN INST
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