CN203301166U - Device for suppressing photovoltaic power generation output power fluctuation - Google Patents
Device for suppressing photovoltaic power generation output power fluctuation Download PDFInfo
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- CN203301166U CN203301166U CN201320369191XU CN201320369191U CN203301166U CN 203301166 U CN203301166 U CN 203301166U CN 201320369191X U CN201320369191X U CN 201320369191XU CN 201320369191 U CN201320369191 U CN 201320369191U CN 203301166 U CN203301166 U CN 203301166U
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- 238000010248 power generation Methods 0.000 title claims abstract description 18
- 238000004146 energy storage Methods 0.000 claims abstract description 26
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 description 4
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- 238000011217 control strategy Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
本实用新型公开了一种抑制光伏发电输出功率波动的装置,它包括一套以上的光伏阵列组件(1),其特征在于:光伏阵列组件(1)与储能装置(3)连接,储能装置(3)的输出通过双向逆变器(4)与电网负载(5)连接。其原理是利用储能装置的容量对光伏输出功率进行平抑,保证输出功率的稳定,提高供电可靠性,向用户输送合格质量的电能。光伏发电先进入储能,再通过双向逆变器转化为交流电源,向负载供电;在储能容量已满的情况下,控制器转为“浮充”方式,直接对负载供电,储能作为补充。
The utility model discloses a device for suppressing output power fluctuations of photovoltaic power generation, which comprises more than one set of photovoltaic array components (1), and is characterized in that: the photovoltaic array components (1) are connected with an energy storage device (3), and the energy storage The output of the device (3) is connected to the grid load (5) through the bidirectional inverter (4). The principle is to use the capacity of the energy storage device to stabilize the photovoltaic output power, ensure the stability of the output power, improve the reliability of power supply, and deliver qualified quality electric energy to users. Photovoltaic power generation first enters energy storage, and then converts it into AC power through a bidirectional inverter to supply power to the load; when the energy storage capacity is full, the controller switches to "float charging" mode to directly supply power to the load, and the energy storage acts as Replenish.
Description
技术领域 technical field
本实用新型涉及一种抑制光伏发电输出功率波动的装置,属于太阳能光伏技术领域。 The utility model relates to a device for suppressing output power fluctuations of photovoltaic power generation, which belongs to the technical field of solar photovoltaics. the
背景技术 Background technique
目前,太阳能光伏发电系统按并网方式可分为:离网发电系统、并网发电系统方式,按母线形式分有直流母线和交流母线两种方式。直流母线方式是光伏阵列组件先汇集到直流母线,再由一台DC/AC逆变器转换为交流电源后供给负载。交流母线方式是光伏阵列组件由DC/AC逆变器转换为交流电源后汇集到交流母线,然后供给负载。目前光伏发电均采用最大功率点跟踪技术(MPPT),实现太阳能的最大利用,但不具备功率调节能力;同时光伏发电系统受到光照、温度等条件影响较大,在直流输出中断时,交流侧输出呈现快速关断特性,电流波动率较大。据相关文献报道,在多云天气下,光伏发电的功率波动可以达到装机容量的25%,最大波动率达到10%额定出力每秒。 At present, solar photovoltaic power generation systems can be divided into grid-connected methods: off-grid power generation systems and grid-connected power generation systems. According to the bus form, there are two ways: DC bus and AC bus. The DC bus mode is that the photovoltaic array components are first collected into the DC bus, and then converted into AC power by a DC/AC inverter to supply the load. The AC bus mode is that the photovoltaic array components are converted into AC power by the DC/AC inverter and collected to the AC bus, and then supplied to the load. At present, photovoltaic power generation adopts the maximum power point tracking technology (MPPT) to realize the maximum utilization of solar energy, but it does not have power adjustment capabilities; at the same time, photovoltaic power generation systems are greatly affected by conditions such as light and temperature. When the DC output is interrupted, the AC side output It presents a fast turn-off characteristic, and the current fluctuation rate is large. According to relevant literature reports, in cloudy weather, the power fluctuation of photovoltaic power generation can reach 25% of the installed capacity, and the maximum fluctuation rate can reach 10% of the rated output per second. the
为了解决光伏发电的功率波动大、不可调节控制的问题,目前采用的方法是增加储能装置(一般为电池),安装在直流母线或交流母线上,根据系统功率平衡控制储能的输入、输出,但是受控制系统的影响,以及其控制策略是根据电压波动来控制,在时间上有滞后等因素,造成输出功率波动较大,系统电压波动较大。 In order to solve the problem of large power fluctuations and non-adjustable control of photovoltaic power generation, the current method is to add energy storage devices (usually batteries), install them on the DC bus or AC bus, and control the input and output of energy storage according to the system power balance. , but affected by the control system, and its control strategy is controlled according to voltage fluctuations, there are factors such as time lag, resulting in large fluctuations in output power and large fluctuations in system voltage. the
发明内容 Contents of the invention
本实用新型要解决的技术问题是提供一种系统简单、可有效解决光伏发电的功率波动大、不可调节控制的问题,使得其功率输出稳定的抑制光伏发电输出功率波动的装置,可以克服现有技术的不足。 The technical problem to be solved by the utility model is to provide a device with a simple system, which can effectively solve the problem of large power fluctuations of photovoltaic power generation and unadjustable control, so that its power output can be stable and suppress the fluctuation of photovoltaic power generation output power, which can overcome the existing Insufficient technology. the
本实用新型的技术方案是: 一种抑制光伏发电输出功率波动的装置,它包括一套以上的光伏阵列组件,光伏阵列组件与储能装置连接,储能装置的输出通过双向逆变器与电网负载连接。 The technical solution of the present utility model is: a device for suppressing fluctuations in output power of photovoltaic power generation, which includes more than one set of photovoltaic array components, the photovoltaic array components are connected to an energy storage device, and the output of the energy storage device is connected to the power grid through a bidirectional inverter load connection. the
一套以上的光伏阵列组件通过串联、并联或串并联组合相互连接。 More than one set of photovoltaic array components are connected to each other through series, parallel or combination of series and parallel. the
在光伏阵列组件与储能装置之间设有DC/DC充电装置。 A DC/DC charging device is provided between the photovoltaic array assembly and the energy storage device. the
所述的双向逆变器为DC/AC双向逆变器。 The bidirectional inverter is a DC/AC bidirectional inverter. the
与现有技术比较,本实用新型将光伏阵列组件通过串、并联后,通过DC/DC充电装置,对储能(电池)进行充电,再通过双向逆变器转化为交流电源,向负载供电。在晚间或无阳光时,利用电网波谷电价便宜,把电网电能通过DC/AC双向逆变器对储能装置进行充电,起到电网削峰填谷作用。其原理是:利用储能装置的容量对光伏输出功率进行平抑,保证输出功率的稳定,提高供电可靠性,向用户输送合格质量的电能。光伏发电先进入储能,再通过双向逆变器转化为交流电源,向负载供电;在储能容量已满的情况下,控制器转为“浮充”方式,直接对负载供电,储能作为补充。 Compared with the prior art, the utility model connects the photovoltaic array components in series and parallel, charges the energy storage (battery) through a DC/DC charging device, and then converts it into AC power through a bidirectional inverter to supply power to the load. In the evening or when there is no sunshine, the electricity price in the valley of the power grid is cheap, and the power of the grid is charged through the DC/AC bidirectional inverter to charge the energy storage device, which plays the role of peak-shaving and valley-filling of the power grid. The principle is: use the capacity of the energy storage device to stabilize the photovoltaic output power, ensure the stability of the output power, improve the reliability of power supply, and deliver qualified quality electric energy to users. Photovoltaic power first enters energy storage, and then converts it into AC power through a bidirectional inverter to supply power to the load; when the energy storage capacity is full, the controller switches to "float charging" mode to directly supply power to the load, and the energy storage acts as Replenish. the
附图说明 Description of drawings
图1为本实用新型的结构示意图。 Fig. 1 is the structural representation of the utility model. the
具体实施方式 Detailed ways
本装置各部件的连接结构如图1所示,一套以上的光伏阵列组件1串、并联后通过DC/DC充电装置2,对储能装置3进行充电,再通过双向逆变器4转化为交流电源,向电网负载5供电。
The connection structure of each part of the device is shown in Figure 1. More than one set of
起具体供电方式为: The specific power supply method is:
在夜间或设定时段,利用电网能量,通过双向逆变器4对储能装置3进行充电,充分利用峰谷电价差,对电网起到削峰填谷作用,直到储能装置3即电池充满电后,充电停止。
At night or during a set time period, the
当光伏阵列组件1输出能量,而且光伏阵列组件1发出的能量大于电网负载5需要的能量,储能装置3也可以充电时,让DC/DC充电装置2工作在MPPT 功率点,给储能装置3充电,同时将多余的电能通过双向逆变器4向负载5进行供电。
When the
当光伏阵列组件1输出的能量,而且大于负载5需要的功率,而储能装置3充电电压已经达到过充电压时,则直接通过“浮充”方式对负载5供电。
When the energy output by the
当光伏阵列组件1输出的能量小于负载5需要的能量,不足的能量需要由蓄电池放电来补充,DC/DC充电装置2工作在MPPT功率点,双向逆变器4工作在放电模式。
When the energy output by the
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CN103337868A (en) * | 2013-06-26 | 2013-10-02 | 贵州电力试验研究院 | Method and device for inhibiting photovoltaic generation output power fluctuation |
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