CN105939027A - 家用光伏智能并离网*** - Google Patents

家用光伏智能并离网*** Download PDF

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Publication number
CN105939027A
CN105939027A CN201610504426.XA CN201610504426A CN105939027A CN 105939027 A CN105939027 A CN 105939027A CN 201610504426 A CN201610504426 A CN 201610504426A CN 105939027 A CN105939027 A CN 105939027A
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grid
relay
energy storage
state
combining inverter
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CN201610504426.XA
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周星宇
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    • H02J3/383—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/10—Photovoltaic [PV]
    • 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
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Inverter Devices (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

本发明公开了一种家用光伏智能并离网***，它包括太阳能电池板、太阳能分配器、正弦波发生器、继电器、并网逆变器、家用负载、微蓄能装置和主蓄能装置。所述太阳能电池板输出的电能经太阳能分配器向主蓄能装置和并网逆变器供电。并网逆变器输出端经继电器向国网供电时，确保电流频率和相位与国网一致。当国网断电时并网逆变器停止工作，正弦波发生器向并网逆变器输入信号，从而激活微蓄能装置充电。所述继电器与正弦波发生器之间串联微蓄能装置，所备电能用于离网阶段维持继电器和正弦波发生器运行。本发明在原有离网发电的基础上增加了并网发电功能，并且在国网突然停电时，本***仍然能正常发电。

Description

家用光伏智能并离网***
技术领域
本发明涉及的技术领域为智能电网，具体地讲，本发明涉及一种家用光伏智能并离网***。
背景技术
随着科学技术的进步，当今的光伏发电技术已十分成熟，一些有条件的家庭投资兴建了家用光伏发电***，所得到的电能除能够满足家庭日常用电需求外，仍然有部分富余电能用储能装置蓄电存储，以备雨雪天等光照不足的日子使用。现有技术的家用光伏发电***均为离网***，该***虽然能够满足家庭自用电需求，但电能利用率低，再加上能量转换环节多，损耗多，经济效益差。近几年来，国家大力实施智能电网工程建设，国网智能化管理能力大大提升，已具备接受分布式发电***及家用光伏发电微网***电能的能力及条件。目前政府出台了一系列节能减排政策，允许分布式发电***及家用光伏发电微网***向国网输送电能或购电，此政策实施必将推动并离网技术的研究，从而实现提升光伏发电利用率的目的。
发明内容
本发明主要针对现有技术的家用光伏发电微网***仅处于离网运行的不足，提出一种配置简单、自动化程度高、电能利用率高，既能离网独立运行，也能并网运行的家用光伏智能并离网***。
本发明通过下述技术方案实现技术目标。
家用光伏智能并离网***，它包括太阳能电池板、太阳能分配器、正弦波发生器、继电器、并网逆变器、家用负载、微蓄能装置和主蓄能装置。所述太阳能电池板集中输出的电能经太阳能分配器向主蓄能装置和并网逆变器供电。其改进之处在于：所述并网逆变器内置锁相及安全保护电路，使得并网逆变器输出端经继电器向国网供电时，确保电流频率和相位与国网一致，当国网断电时，内置的锁相电路断开使并网逆变器停止工作，此时正弦波发生器经继电器向并网逆变器输入正弦波信号，正弦波信号激活处于离网状态下的微蓄能装置充电。所述家用负载与并网逆变器之间由继电器控制通断。所述继电器与正弦波发生器之间串联微蓄能装置，所备电能用于并网逆变器在离网运行阶段时维持正常运行。
本发明与现有技术相比，具有以下积极效果：
1、***内置的并网逆变器组成简单、兼容性强、安全可靠；
2、离网和并网阶段共用一并网逆变器，***简洁、故障率小，减少谐波污染，使***的功率因素达到最大；
3、在原有并网发电的基础上，增加了离网发电功能，以及国网突然停电时本***仍然能保持正常发电，既方便家庭用电，又提高光伏电能利用价值；
4、***根据负载及国网情况，自动控制并网或离网发电，同时能有效解决孤岛效应等***安全问题。
附图说明
图1是本发明电路方框原理图。
具体实施方式
下面根据附图对本发明作进一步说明。
图1所示的家用光伏智能并离网***，它包括太阳能电池板1、太阳能分配器2、正弦波发生器3、继电器4、并网逆变器5、家用负载6、微蓄能装置7和主蓄能装置8。所述太阳能电池板1按发电功率配置，一族太阳能电池板1集中输出的电能经太阳能分配器2向主蓄能装置8和并网逆变器5供电，多余的电能由主蓄能装置8储存备用。太阳能分配器2配给并网逆变器5的电源为直流电，经逆变后成交流电供家用负载6使用。为了做到并网和离网共用同一并网逆变器5，本发明在并网逆变器5锁相电路及安全保护电路，其作用是控制并网逆变器5输出端经继电器4向国网供电时，确保交流电频率和相位符合并网质量要求。同时对***内外可能出现的孤岛效应、过载、输出短路、输入反接等都具有很好的保护功能，为了做到有序切换家用负载6，并网逆变器5与家用负载6之间由继电器4控制，可根据负载及国网情况作通断切换。当国网断电时，内置的锁相电路断开使并网逆变器5停止工作，此时正弦波发生器3输出端经继电器4向并网逆变器5输入正弦波信号，正弦波信号激活处于离网状态下的并网逆变器5工作，给微蓄能装置7充电。所述继电器4与正弦波发生器3之间串联微蓄能装置7，利用微蓄能装置7储存电能，所备电能用于并网逆变器5在离网阶段时维持正常运行。本发明在原有离网发电的基础上增加了并网发电功能，并且在国网突然停电时，本***仍然能正常发电，此功能既方便家庭用电，又提高光伏电能利用价值。

Claims (1)

1.一种家用光伏智能并离网***，它包括太阳能电池板(1)、太阳能分配器(2)、正弦波发生器(3)、继电器(4)、并网逆变器(5)、家用负载(6)、微蓄能装置(7)和主蓄能装置(8)；所述太阳能电池板(1)集中输出的电能经太阳能分配器(2)向主蓄能装置(8)和并网逆变器(5)供电；其特征在于：所述并网逆变器(5)内置锁相及安全保护电路，使得并网逆变器(5)输出端经继电器(4)向国网供电时，确保电流频率和相位与国网一致，当国网断电时，内置的锁相电路断开使并网逆变器(5)停止工作，此时正弦波发生器(3)经继电器(4)向并网逆变器(5)输入正弦波信号，正弦波信号激活处于离网状态下的微蓄能装置(7)充电；所述家用负载(6)与并网逆变器(5)之间由继电器(4)控制通断；所述继电器(4)与正弦波发生器(3)之间串联微蓄能装置(7)，所备电能用于并网逆变器(5)在离网运行阶段时维持正常运行。
CN201610504426.XA 2016-06-24 2016-06-24 家用光伏智能并离网*** Pending CN105939027A (zh)

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Cited By (1)

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CN110943486A (zh) * 2019-12-25 2020-03-31 深圳市永联科技股份有限公司 一种储能逆变器并离网及离并网无缝切换的控制方法

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CN103595074A (zh) * 2013-11-26 2014-02-19 北京国电通网络技术有限公司 一种智能离并网逆变器一体化运行的***
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CN204886384U (zh) * 2015-07-28 2015-12-16 北京京仪椿树整流器有限责任公司 小功率家用光伏发电储能一体终端
CN105006841A (zh) * 2015-07-30 2015-10-28 盐城工学院 一种三相并网逆变器的无缝并网控制器及其控制方法
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110943486A (zh) * 2019-12-25 2020-03-31 深圳市永联科技股份有限公司 一种储能逆变器并离网及离并网无缝切换的控制方法
CN110943486B (zh) * 2019-12-25 2023-02-21 深圳市永联科技股份有限公司 一种储能逆变器并离网及离并网无缝切换的控制方法

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Application publication date: 20160914