阅读说明：本技术 一种光储充一体化电站系统 (Light storage and charging integrated power station system ) 是由 周玉 朱卓敏 于 2021-08-27 设计创作，主要内容包括：本发明公开了一种光储充一体化电站系统,包括光伏模块、储能模块和充电模块,光伏模块、储能模块和充电模块接入同一配电路线,以形成微电网,微电网具有接入市电系统的能力,光伏模块用于光伏发电,储能模块用于储能和补充放电,充电模块用于给外部设备充电,光伏模块产生的电量输送至储能模块、充电模块和市电系统中的一种或多种,储能模块放电输出的电量输送至充电模块,并在市电系统处于谷值电价期间通过市电系统进行储能；在市电系统处于峰值电价期间,充电模块优先采用光伏模块供电,其次采用储能模块和/或市电系统补充供电。本发明提供的光储充一体化电站系统通过光伏、储能和市电一起为充电站供电,极大缓解了用电高峰期的用电紧张。(The invention discloses a light storage and charging integrated power station system, which comprises a photovoltaic module, an energy storage module and a charging module, wherein the photovoltaic module, the energy storage module and the charging module are connected to the same power distribution line to form a microgrid, the microgrid has the capability of being connected to a commercial power system, the photovoltaic module is used for photovoltaic power generation, the energy storage module is used for energy storage and complementary discharge, the charging module is used for charging external equipment, electric quantity generated by the photovoltaic module is transmitted to one or more of the energy storage module, the charging module and the commercial power system, and electric quantity discharged and output by the energy storage module is transmitted to the charging module and stored by the commercial power system when the commercial power system is at a valley electricity price; when the commercial power system is in the peak electricity price period, the charging module preferentially adopts the photovoltaic module to supply power, and then adopts the energy storage module and/or the commercial power system to supplement the power supply. The light storage and charging integrated power station system provided by the invention supplies power to the charging station through photovoltaic, energy storage and commercial power, so that the power shortage in the peak period of power utilization is greatly relieved.)

1. The photovoltaic module, the energy storage module and the charging module are connected to the same power distribution line to form a microgrid, the microgrid has the capacity of being connected to a mains supply system, the photovoltaic module is used for photovoltaic power generation, the energy storage module is used for storing energy and supplementing discharge, the charging module is used for charging external equipment, electric quantity generated by the photovoltaic module is transmitted to one or more of the energy storage module, the charging module and the mains supply system, electric quantity output by the discharging of the energy storage module is transmitted to the charging module, and energy is stored through the mains supply system when the mains supply system is at a valley electricity price;

and when the commercial power system is in a peak electricity price period, the charging module preferentially adopts the photovoltaic module to supply power, and then adopts the energy storage module and/or the commercial power system to supplement power supply.

2. The integrated light-storage-and-charge power station system as claimed in claim 1, wherein during the period of the mains electricity system at the valley price, the charging module is powered by photovoltaic modules preferentially and the mains electricity system is used for supplying power supplementarily.

3. The integrated optical storage and charging power station system as claimed in claim 1, wherein when the charging module preferentially adopts the photovoltaic module to supply power and secondly adopts the energy storage module to supplement power, if the energy stored in the energy storage module is reduced to a preset safe amount of power, the energy storage module stops outputting power and the commercial power system is replaced with the supplementary power supply.

4. The integrated light-storage-and-charging power station system as claimed in claim 1, wherein the microgrid also has the capability of being connected to a household power grid system, the household power grid system and the microgrid are connected to the same mains power system, and the photovoltaic module and the energy storage module can also supply power to the household power grid system.

5. The integrated optical storage and charging power station system according to claim 4, further comprising a plurality of smart meters, wherein the photovoltaic module, the energy storage module and the charging module are respectively connected to the same power distribution line through the smart meters, and the micro grid is connected to the commercial power system through the smart meters.

6. The integrated optical storage and charging power station system as claimed in claim 1, wherein the energy storage module determines the amount of energy stored during the period when the utility power system is at the valley power rate according to the historical amount of energy and/or the future weather condition of the charging module.

7. The integrated optical storage and charging power station system as claimed in claim 6, wherein the gap power supply amount of the photovoltaic module during the forecast peak daily power consumption period is obtained according to the power consumption of the charging module during the peak daily power price period and the generated power amount of the photovoltaic module, and the energy storage module stores at least the gap power supply amount before the forecast peak daily power price period.

8. The light charging integration power station system of claim 7,

if the forecast day is a working day, calculating the gap power supply quantity according to the power consumption of the charging module and the power generation quantity of the photovoltaic module during the peak electricity price period of the latest n working days;

and if the predicted day is a holiday, calculating the gap power supply amount according to the power consumption of the charging module and the power generation amount of the photovoltaic module during the peak electricity price period of the latest m holidays.

9. The light storage and charging integrated power station system of claim 6,

if the forecast day is changed from the cloudy day to the sunny day on the day before, the energy storage module reduces the energy storage capacity on the basis of the energy storage on the day before;

and if the forecast day is changed from a sunny day to a cloudy day or a rainy day, the energy storage module increases the energy storage capacity on the basis of the energy storage of the previous day.

10. The integrated light-storage-and-charge power station system as claimed in claim 1, wherein the photovoltaic module outputs electricity through an inverter in the form of a roof photovoltaic module, the charging module supplies electricity to external equipment in the form of a charging pile, and the energy storage module is charged and discharged in the form of an energy storage battery.

Technical Field

The invention relates to the technical field of charging and discharging of energy storage power stations, in particular to a light storage and charging integrated power station system.

Background

The development of new energy automobiles is a necessary way for China to move from the automobile kingdom to the automobile forcing country, and is a strategic measure for coping with climate change and promoting green development. The problem of charging is the core of the development of new energy automobile industry in China. Since 2012, the development of new energy automobile industry in China has gained huge achievements and becomes one of the important forces for the development and transformation of automobile industry in the world. As the charging pile of the key supporting facilities of the new energy automobile, the charging pile has gained high attention of policies and markets. From 2015 to date, more than twenty support policies about charging infrastructure have been issued by government departments in China and various regions, and development of the construction of the charging infrastructure in China is greatly promoted.

According to the plan of the development guidelines of electric vehicle charging infrastructures (2015-2020), the conservation quantity ratio of new energy vehicles to charging piles in China reaches 1:1 basically by 2020. By 2019, the accumulated sales volume of new energy vehicles in China is nearly 420 thousands, the total quantity of charging piles in China is nearly 120 thousands, the proportion of the charging piles only reaches 3.5:1, and compared with the planning index, the number of the charging piles has a large gap. In the year 2020 of 4, the national development and improvement committee announces that about 20 ten thousand public piles, more than 40 thousands private piles and 4.8 ten thousand public charging stations are newly added with about 100 million yuan investment all the year round.

However, the gap of the national charging pile facility is huge, but the construction of the current charging pile faces two major problems and challenges:

1. the degree of dependence of the public power grid is high. At present, the construction of a charging pile is mainly based on a public power grid, and if the transformer capacity of the public power grid is insufficient or the access point distance is too far, the construction requirement of the charging pile cannot be met.

2. The impact of electricity on the power grid is huge. Electric automobile that quantity is huge fills electric pile can produce very big influence to the electric wire netting after inserting the electric wire netting. When the electric vehicle is charged in a centralized manner, the situation that the capacity of the power grid is insufficient may occur, and the power balance of the whole power system is affected. In addition, different electric vehicles are charged together, and the electric energy quality on a public power grid is greatly influenced, so that the safe and stable operation of the power grid is threatened.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a light storage and charging integrated power station system, which has the following specific technical scheme:

the utility model provides a light storage and charging integrated power station system, including photovoltaic module, energy storage module and charging module, photovoltaic module, energy storage module and charging module access same distribution route to form little electric wire netting, little electric wire netting has the ability of inserting commercial power system, photovoltaic module is used for photovoltaic power generation, energy storage module is used for energy storage and supplementary discharge, charging module is used for charging external equipment, the electric quantity that photovoltaic module produced is carried to one or more in energy storage module, charging module and the commercial power system, the electric quantity that energy storage module discharged output is carried to charging module, and carry out the energy storage through the commercial power system during the commercial power system is in the valley price;

and when the commercial power system is in a peak electricity price period, the charging module preferentially adopts the photovoltaic module to supply power, and then adopts the energy storage module and/or the commercial power system to supplement power supply.

Further, during the period that the commercial power system is at the valley price, the charging module preferentially adopts the photovoltaic module to supply power, and then adopts the commercial power system to supplement power supply.

Further, when the charging module preferentially adopts the photovoltaic module to supply power and then adopts the energy storage module to supplement power, if the energy storage of the energy storage module is reduced to the preset safe electric quantity, the energy storage module stops outputting the electric quantity and replaces the electric quantity with the supplementary power supply of the mains supply system.

Further, the microgrid also has the capability of being connected into a household power grid system, the household power grid system and the microgrid are connected into the same mains supply system, and the photovoltaic module and the energy storage module can also supply power to the household power grid system.

Further, the light storage and charging integrated power station system further comprises a plurality of intelligent electric meters, the photovoltaic module, the energy storage module and the charging module respectively pass through the intelligent electric meters connected into the same power distribution line, and the micro-grid is connected into the commercial power system through the intelligent electric meters.

Further, the energy storage module determines the energy storage capacity during the period that the commercial power system is at the valley power rate according to the historical capacity of the charging module and/or the future weather state.

Further, according to the power consumption of the charging module during the peak electricity price period of the last multiple days and the generated electricity quantity of the photovoltaic module, the gap power supply quantity of the photovoltaic module during the forecast peak electricity consumption peak period is obtained, and the energy storage module at least stores energy to the gap power supply quantity before the forecast peak electricity price period.

Further, if the forecast day is a working day, calculating the gap power supply amount according to the power consumption of the charging module and the power generation amount of the photovoltaic module during the peak electricity price period of the latest n working days; and if the predicted day is a holiday, calculating the gap power supply amount according to the power consumption of the charging module and the power generation amount of the photovoltaic module during the peak electricity price period of the latest m holidays.

Further, if the forecast day is changed from a cloudy day to a sunny day on the previous day, the energy storage module reduces the energy storage capacity on the basis of the energy storage on the previous day; and if the forecast day is changed from a sunny day to a cloudy day or a rainy day, the energy storage module increases the energy storage capacity on the basis of the energy storage of the previous day.

Further, the photovoltaic module outputs electric quantity through the inverter in the form of a roof photovoltaic assembly, the charging module supplies power to external equipment in the form of a charging pile, and the energy storage module is charged and discharged in the form of an energy storage battery.

The invention has the following advantages:

a. the photovoltaic power generation system supplies power to the charging station together with the stored energy and the commercial power, so that the power shortage in the peak period of power utilization is greatly relieved;

b. in a power supply system for realizing peak-valley value, peak clipping and valley filling are realized, and the electric charge is saved;

c. the problem of the not enough distribution capacity of new energy automobile charging station is solved, the consumption of new energy has been increased simultaneously.

Drawings

Fig. 1 is a schematic structural diagram of a light storage and charging integrated power station system provided in an embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

In an embodiment of the invention, a light storage and charging integrated power station system is provided, which includes a photovoltaic module, an energy storage module and a charging module, where the photovoltaic module, the energy storage module and the charging module are connected to a same power distribution line to form a microgrid, the microgrid has a capability of being connected to a commercial power system, the photovoltaic module is used for photovoltaic power generation, the energy storage module is used for energy storage and supplementary discharge, the charging module is used for charging external devices, and electric quantity generated by the photovoltaic module is transmitted to one or more of the energy storage module, the charging module and the commercial power system; the electric quantity discharged and output by the energy storage module is transmitted to the charging module, and the electric quantity is stored by the commercial power system when the commercial power system is at the valley price;

during the period that the commercial power system is at the valley price, the charging module preferentially adopts the photovoltaic module to supply power, then adopts the commercial power system to supplement the power supply, and if the two are still insufficient in power supply, the energy storage module is reused to supplement the power supply.

During the period that the commercial power system is at the peak electricity price, there are the following distribution modes:

a. the charging module is powered by the photovoltaic module preferentially, and then the energy storage module is used for supplying power additionally.

Under the condition, if the energy stored in the energy storage module is reduced to the preset safe electric quantity, the energy storage module stops outputting the electric quantity, and the supplementary power supply of the commercial power system is replaced. Specifically, the preset safe electric quantity is set to 15% of the maximum energy storage of the energy storage module, so that the energy storage module can be used as an emergency power supply, for example, in thunderstorm weather, the power supply is stopped when the commercial power system fails, meanwhile, the photovoltaic module can not supply power, and at the moment, the residual energy storage of the energy storage module can be used as the emergency power supply.

b. The charging module is powered by the photovoltaic module preferentially, and the commercial power system is used for supplying power supplementarily.

c. The charging module preferentially adopts a photovoltaic module to supply power, and secondly adopts an energy storage module and the commercial power system to supply power at the same time.

In an embodiment of the present invention, referring to fig. 1, the optical storage and charging integrated power station system can not only charge an electric vehicle through a charging module, but also supply power to a household or a market at the same time to achieve energy saving and emission reduction, for example, the microgrid also has a capability of accessing to a household power grid system, the household power grid system and the microgrid access to the same utility power system, and the photovoltaic module and the energy storage module can also supply power to the household power grid system, for example, the current surplus electric quantity of the power station coefficient is used to supply power to lighting equipment and air conditioning equipment in a home, so as to save electric charges.

The photovoltaic module passes through dc-to-ac converter output electric quantity with roof photovoltaic module's form, the module that charges gives the external equipment power supply with the form of filling electric pile, for example electric automobile, it includes direct current charging pile and alternating current charging pile to fill electric pile, energy storage module charges and discharges with energy storage battery's form, restricts input output through energy storage converter, light stores up and fills integration power station system still includes a plurality of smart electric meters, photovoltaic module, energy storage module and the module of charging pass through respectively smart electric meter links into and inserts same distribution route, little electric wire netting passes through smart electric meter links into utility power system to can audio-visually clear understand each module and each system's power supply power consumption condition.

In one embodiment of the present invention, the energy storage module is capable of obtaining the energy storage capacity during the period when the utility power system is at the valley power rate according to the historical capacity of the charging module. And according to the power consumption of the charging module and the power generation amount of the photovoltaic module during the latest multi-day peak power rate period, taking the average value of the power consumption of the charging module and the power generation amount of the photovoltaic module during the multi-day peak power rate period and making a difference to obtain the notch power supply amount of the photovoltaic module during the forecast daily power consumption peak period, wherein the energy storage module at least stores energy to the notch power supply amount before the forecast daily peak power rate period. Specifically, if the predicted day is a working day, calculating the gap power supply amount according to the power consumption of the charging module and the power generation amount of the photovoltaic module during the peak electricity price period of the last 5 working days; and if the forecast day is a holiday, calculating the gap power supply amount according to the power consumption of the charging module and the power generation amount of the photovoltaic module during the peak electricity price period of the latest 3 holidays.

In order to predict the energy storage electric quantity more accurately, the future weather state is also considered, if the weather is predicted to change from the cloudy day of the previous day to the sunny day on the day of the prediction day, the energy storage electric quantity is reduced by the energy storage module on the basis of the energy storage of the previous day, for example, the prediction day is a sunny day, the temperature is above 30 ℃, and the energy storage module reduces half of the energy storage; if the forecast day is changed from a sunny day to a cloudy day or a rainy day, the energy storage module increases the energy storage capacity on the basis of the energy storage of the previous day, for example, the forecast day is free of illumination and the temperature is below 15 ℃, and the energy storage module increases half of the energy storage.

It should be noted that the utility power system may use two power rates at peak and valley, for example, a peak power rate period is 7:00-23:00 every day, and the rest is a valley power rate period; peak-to-valley three-phase electricity prices can also be used for power supply, such as 7: 00-11: 00 and 19: 00-23:00 is the peak electricity rate period, 11: 00-19: 00 is the usual electricity price period; 23 per day: 00-day 7: and 00 is the valley power rate period. When the mains supply system supplies power by using the peak-to-valley three-stage power rate mode, the processing mode during the normal power rate period is the same as the processing mode during the valley power rate period when the peak-to-valley two-stage power rate power supply mode is used, and details are not repeated here.

In one embodiment of the invention, the optical storage and charging integrated power station system has at least the following three operation strategies:

(1) grid-connected operation strategy

In the operating strategy, the strategy has the following four modes:

a. grid connected standby mode

In the mode, the micro-grid is connected to a commercial power system, the commercial power system works normally, the photovoltaic module is separated from the micro-grid, and the energy storage module is in standby. The mode is suitable for scenes without photovoltaic and energy storage power supply, and the load is completely supplied by commercial power.

b. Energy storage standby mode

In the mode, the micro-grid is connected to a commercial power system, the commercial power system works normally, the photovoltaic module automatically uses itself, the residual electricity is on the internet, and the energy storage module is in standby. The mode is suitable for scenes which need photovoltaic power supply but do not need energy storage power supply, the load preferentially uses the photovoltaic power supply, and the insufficient part is supplemented by commercial power.

c. Peak clipping and valley filling mode

In the mode, the micro-grid is connected to a commercial power system, the commercial power system works normally, the photovoltaic module automatically uses electricity, the residual electricity is used for surfing the Internet, the energy storage module performs peak clipping and valley filling operation, energy is stored during valley value electricity price, and electricity is discharged during peak value electricity price. The mode is suitable for a scene needing photovoltaic and energy storage to supply power together, the energy storage can obtain benefits through peak-valley electricity price difference, the load preferentially uses the photovoltaic and the energy storage to supply power, and the insufficient part is supplemented by commercial power.

d. Cycling charge-discharge mode

In the mode, the micro-grid is connected to a commercial power system, the commercial power system works normally, the photovoltaic module is used by itself, the rest power is used for surfing the internet, and the energy storage module does not consider the peak-valley period and the valley-peak period of the commercial power system and performs cyclic charge and discharge. The mode is suitable for a scene needing photovoltaic and energy storage for supplying power together, the energy storage is operated according to a charging-discharging-charging mode, peak-valley electricity price difference is not considered, the load preferentially uses the photovoltaic and the energy storage for supplying power, and the insufficient part is supplemented by commercial power.

(2) Off-grid operating strategy

This tactics adopts the island operation model, and in this mode, the utility power system has a power failure or disconnection, and the microgrid breaks away from utility power system, and photovoltaic module is whole from using, and energy storage module is used for stabilizing bus voltage and frequency, and this mode is used for the scene that does not need the mains supply, and the load power consumption in the energy storage guarantee microgrid, load use photovoltaic and energy storage power supply, disconnection load when not enough.

(3) Outage microgrid strategy

In the strategy, the micro-grid is separated from a mains supply system, the photovoltaic module is separated from the micro-grid, and the energy storage module is in standby and separated from the micro-grid. The strategy is used for a scene that all devices in the microgrid need to be shut down, and the states of the devices and the switches cannot be changed manually.

The photovoltaic, energy storage and charging integrated power station system provided by the invention forms a micro-grid system through photovoltaic, energy storage and charging, can utilize off-peak electricity at night to store energy, and supplies power to the charging station through photovoltaic, energy storage and commercial power at the peak charging period, so that the charging requirement at the peak charging period is met, peak clipping and valley filling are realized, the problem of insufficient power distribution capacity of the new energy automobile charging station can be solved, and the consumption of new energy is increased. In addition, the system can realize various operation strategies such as grid connection, grid disconnection, outage and the like. Furthermore, the optical storage and charging integrated power station system provided by the invention fully mobilizes the regulation response capability of the load side by relying on new technologies such as modern information communication technology, big data, artificial intelligence and energy storage, and can develop the park level source network load and storage integrated construction combining distributed power generation and flexible charging and discharging of the electric automobile in urban commercial districts and commercial complexes by relying on photovoltaic power generation, grid-connected micro-grids, electric automobile charging infrastructure construction and the like; the method can support the development and construction of the distributed power supply and nearby access consumption in areas with large industrial load scale and good new energy resource conditions, and can be used for developing the construction of a source-network-load-storage integrated green power supply industrial park by combining the work of an incremental power distribution network and the like. The comprehensive optimization configuration scheme of research sources, networks, loads and storages is combined, the fusion development with the multi-energy complementary demonstration park and intelligent comprehensive energy service is promoted, the self-balancing capacity is improved under the economic and feasible conditions, and the peak regulation and capacity reserve requirements of a large power grid are reduced.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes that can be directly or indirectly applied to other related technical fields using the contents of the present specification and the accompanying drawings are included in the scope of the present invention.