CN114256876A - 一种应用于低压台区的分布式光伏逆变器控制策略 - Google Patents

一种应用于低压台区的分布式光伏逆变器控制策略 Download PDF

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CN114256876A
CN114256876A CN202111571805.8A CN202111571805A CN114256876A CN 114256876 A CN114256876 A CN 114256876A CN 202111571805 A CN202111571805 A CN 202111571805A CN 114256876 A CN114256876 A CN 114256876A
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control
intelligent terminal
voltage
transformer area
photovoltaic inverter
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葛玉磊
许腾
刘清
郑亚岗
李瑞文
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Qingdao Topscomm Communication Co Ltd
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    • 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
    • H02J3/381—Dispersed generators
    • 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
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    • H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • H—ELECTRICITY
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    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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  • Engineering & Computer Science (AREA)
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  • Inverter Devices (AREA)

Abstract

本发明公开了一种应用于低压台区的分布式光伏逆变器控制策略，包括以下步骤：步骤1，采集系统向台区智能终端下发采集任务；步骤2，台区智能终端周期采集光伏逆变器电压、电流、功率实时数据；步骤3，转换器接收台区智能终端采集和控制指令，通过RS‑485接口采集逆变器数据，向逆变器下发控制指令；步骤4，台区智能终端周期监测光伏逆变器电压，当连续两个周期电压越上限时，下发控制命令，控制逆变器输出功率，并生成控制事件；步骤5，当电压恢复正常后，台区智能终端撤销控制指令；步骤6，台区智能终端连续两次检测到10kv反送电交采功率达到变压器容量的80％，下发控制命令(群控)，控制逆变器输出功率，并生成控制事件。

Description

一种应用于低压台区的分布式光伏逆变器控制策略
技术领域
本发明涉及光伏逆变器技术领域，尤其涉及一种应用于低压台区的分布式光伏逆变器控制策略。
背景技术
随着光伏以及分布式发电技术的不断发展，配电网中的科技成分将会越来越丰富，未来这些新技术将会带给供电网络更多机遇与挑战。目前分布式光伏的上网政策是先上后治，加上居民以及厂家的推动，导致分布式光伏在无序快速增长。特别是国家调整的光伏补贴政策前又上了一批新的光伏。供电所的人员无法控制分布式光伏的容量。由于光伏电源输出具有波动性和随机性，电压的波动也是不可避免的，而由此将会带来较为普遍的谐波污染、电压闪变与波动以及电压越限等严重的电能质量问题，其将不仅给用户带来经济上的损失，还威胁到电气设备的安全性和可靠性。
目前，分布式光伏缺乏规范的监控管理，亟待进一步提升低压分布式光伏控制能力，促进光伏消纳能力与供电服务质量提升，保障低压分布式光伏健康、持续、有序发展。
发明内容
本发明所要解决的技术问题是克服上述现有技术存在的问题，提供一种应用于低压台区的分布式光伏逆变器控制策略，方法在本地即可对光伏逆变器功率进行控制，只需按照周期采集任务监控光伏逆变器电压、电流、功率等数据以及台区智能终端本身的交采计量，即可通过台区智能终端分析电压和变压器容量是否超限，并实时对光伏逆变器的功率控制，保障电网的安全运行。
为实现上述目的，本发明采取如下技术方案，包括：
采集系统，用于向台区智能终端下发光伏逆变器的周期采集任务，同时，对台区智能终端上报的数据和事件进行展示；
台区智能终端，用于执行光伏逆变器周期采集任务，下发光伏逆变器控制指令，生成并向采集系统上报控制事件；
通信模块，用于台区智能终端与智能断路器的数据通信，传输数据及控制指令；
智能断路器，用于接收台区智能终端指令，并转发给光伏逆变器，采集光伏逆变器数据后传输给台区智能终端，同时具备接收台区智能终端的控制指令，执行开关的通断；
光伏逆变器，用于连接光伏组件，接收光伏组件提供的直流电能并转化成交流电能，同时，执行智能断路器转发的采集和控制指令。
进一步的，所述采集系统，向台区智能终端下发采集任务，执行时段为白天光照强的12个小时(6:00～18:00)，抄读逆变器的电压、电流、有功功率、无功功率逆变器运行状态等数据，任务每5分钟采集并上报至采集系统，其中电压、电流均为A、B、C三相；
进一步的，所述台区智能终端应具备强大的边缘计算能力、感知能力，能够实现光伏逆变器电压、功率的在线监测和控制；远程通信应支持4G/5G、以太网等方式，同时应具备交采本地计量功能；
进一步的，所述智能断路器通过通信模块与台区智能终端进行数据交互，获取采集和控制指令，通过RS-485接口与光伏逆变器通信，采集逆变器数据，向逆变器下发控制指令，并将数据和控制结果上传至台区智能终端；
进一步的，所述光伏逆变器支持本地的电压、电流、功率计量，能够接收台区智能终端下发的控制指令，实现功率的控制；
进一步的，所述控制策略包括电压越限控制和变压器容量越限控制；
进一步的，所述电压越限控制，台区智能终端周期检查光伏逆变器电压，当连续两个周期电压越上限(Um＝Un*120％)生成越上限事件，下发控制命令，按照功率控制定值设置输出功率(P＝Pn*80％)，并生成控制事件，台区智能终端将事件上报住采集系统进行告警；
进一步的，所述电压越限控制，当电压恢复正常范围内(U＝Un*110％)，台区智能终端撤销控制指令；
进一步的，所述变压器容量越限控制，台区智能终端根据交采的功率，控制光伏逆变器发电额定功率，台区智能终端连续两次检测到10kv反送电的交采功率达到变压器容量的80％，下发控制命令(群控)，按照功率控制定值设置输出功率(P＝Pn*80％)，并生成控制事件，台区智能终端将事件上报住采集系统进行告警。
其中，Um表示越上限电压，Un表示额定电压，U表示正常电压；
P表示输出功率，Pn表示额定功率。
本发明的有益效果是：方法在本地即可对光伏逆变器功率进行控制，只需按照周期采集任务监控光伏逆变器电压、电流、功率等数据以及台区智能终端本身的交采计量，即可通过台区智能终端分析电压和变压器容量是否越限，并实时对光伏逆变器的功率控制，保障电网的安全运行。
附图说明
图1为本发明的总体实施架构图。
图2为本发明的总体控制流程图。
图3为本发明实施例中电压越限控制逻辑图。
图4为本发明实施例中变压器容量越限控制逻辑图。
具体实施方式
下面结合附图对本发明作进一步描述，以下内容仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。
结合附图1，一种应用于低压台区的分布式光伏逆变器控制策略，包括：
采集系统，用于向台区智能终端下发光伏逆变器的周期采集任务，同时，对台区智能终端上报的数据和事件进行展示；
台区智能终端，用于执行光伏逆变器周期采集任务，下发光伏逆变器控制指令，生成并向采集系统上报控制事件；
通信模块，用于台区智能终端与智能断路器的数据通信，传输数据及控制指令；
智能断路器，用于接收台区智能终端指令，并转发给光伏逆变器，采集光伏逆变器数据后传输给台区智能终端，同时具备接收台区智能终端的控制指令，执行开关的通断；
光伏逆变器，用于连接光伏组件，接收光伏组件提供的直流电能并转化成交流电能，同时，执行智能断路器转发的采集和控制指令。
结合附图2，一种应用于低压台区的分布式光伏逆变器控制策略，总体控制流程图包括以下步骤：
步骤1：台区智能终端下发采集任务，执行时段为白天光照强的12个小时(6:00～18:00)，抄读逆变器的电压、电流、有功功率、无功功率逆变器运行状态等数据，任务每5分钟采集并上报至采集系统，其中电压、电流均为A、B、C三相；
步骤2：台区智能终端周期监测光伏逆变器电压和10kv反送电交采功率；
步骤3：台区智能终端判断电压是否越限和变压器容量是否越限；
步骤4：结合附图3实施实例，当连续两个周期电压越上限，即Um＝Un*120％，台区智能终端下发功率控制指令，转换器接收指令并转发给光伏逆变器，光伏逆变器执行功率控制指令，P＝Pn*80％；
步骤5：结合附图3实施实例，台区智能终端周期监测电压，当电压恢复正常范围内，即U＝Un*110％，台区智能终端撤销功率控制指令，否则，继续执行功率控制指令；
步骤6：结合附图4实施实例，当10kv反送电交采功率达到变压器容量的80％，台区智能终端下发功率控制指令，转换器接收指令并转发给光伏逆变器，光伏逆变器执行功率控制指令，P＝Pn*80％；
步骤7：结合附图4实施实例，台区智能终端周期监测电压和10kv反送电交采功率，电压恢复正常，智能台区智能终端撤销功率控制指令，否则，继续执行功率控制指令。
步骤8：结合附图2，当台区智能终端监测到电压越限并下发功率控制指令后，台区智能终端生成越限事件和控制事件上报至采集系统。
其中，Um表示越上限电压，Un表示额定电压，U表示正常电压；
P表示输出功率，Pn表示额定功率。
本实施例利用实际的现场低压分布式光伏台区，安装智能台区智能终端、转换器、光伏逆变器等设备，对本发明所述控制策略进行了测试验证。根据电压越限监测控制及变压器容量越限监测控制，能够实现本地对低压台区分布式光伏逆变器功率进行控制，并实时生成越限事件和控制事件上报至采集系统。
上述实施例是对本发明的具体实施方式的说明，而非对本发明的限制，有关技术领域的技术人员在不脱离本发明的精神和范围的情况下，还可做出各种变换和变化以得到相对应的等同的技术方案，因此所有等同的技术方案均应归入本发明的专利保护范围。

Claims (8)

1.一种应用于低压台区的分布式光伏逆变器控制策略，其特征在于，包括：
采集系统，用于向台区智能终端下发光伏逆变器的周期采集任务，同时，对台区智能终端上报的数据和事件进行展示；
台区智能终端，用于执行光伏逆变器周期采集任务，下发光伏逆变器控制指令，生成并向采集系统上报控制事件；
通信模块，用于台区智能终端与智能断路器的数据通信，传输数据及控制指令；
智能断路器，用于接收台区智能终端指令，并转发给光伏逆变器，采集光伏逆变器数据后传输给台区智能终端，同时具备接收台区智能终端的控制指令，执行开关的通断；
光伏逆变器，用于连接光伏组件，接收光伏组件提供的直流电能并转化成交流电能，同时，执行智能断路器转发的采集和控制指令。
2.根据权利要求1所述的一种应用于低压台区的分布式光伏逆变器控制策略，其特征在于，所述采集系统给台区智能终端配置采集任务，执行时段为白天光照强的12个小时(6:00～18:00)，抄读P、U、I等数据，任务每5分钟采集并上报至采集系统；
其中，P为逆变器输出功率，I为逆变器输出电流，U为逆变器输出电压。
3.根据权利要求1所述的一种应用于低压台区的分布式光伏逆变器控制策略，其特征在于，所述台区智能终端具备强大的边缘计算能力、感知能力，能够实现光伏逆变器电压、功率的在线监测和控制；远程通信应支持4G/5G、以太网等方式；具备交采本地计量功能。
4.根据权利要求1所述的一种应用于低压台区的分布式光伏逆变器控制策略，其特征在于，所述通信模块使用HPLC/双模通信技术，支持高频数据采集，支持标准的载波通信协议，能够通过高速载波通信技术与其他高速载波通信单元进行数据传输。
5.根据权利要求1所述的一种应用于低压台区的分布式光伏逆变器控制策略，其特征在于，所述智能断路器，通过通信模块与台区智能终端进行数据交互，获取采集和控制指令，通过RS-485接口与光伏逆变器通信，采集逆变器数据，向逆变器下发控制指令，并将数据和控制结果上传至台区智能终端。
6.根据权利要求1所述的一种应用于低压台区的分布式光伏逆变器控制策略，其特征在于，所述光伏逆变器支持本地的电压、电流、功率计量，能够接收台区智能终端下发的控制指令，实现功率的控制。
7.根据权利要求3所述的一种应用于低压台区的分布式光伏逆变器控制策略，其特征在于，所述控制策略包括电压越限控制和变压器容量越限控制；
电压越限控制，台区智能终端周期检查光伏逆变器电压，当连续两个周期电压越上限(Um＝Un*120％)生成越上限事件，下发控制命令；按照功率控制定值设置输出功率(P＝Pn*80％)，并生成控制事件，台区智能终端将事件上报住采集系统进行告警；当电压恢复正常范围内(U＝Un*110％)，台区智能终端撤销控制指令；
变压器容量越限控制，台区智能终端根据交采的功率，控制光伏逆变器发电额定功率；台区智能终端连续两次检测到10kv反送电的交采功率达到变压器容量的80％，下发控制命令(群控)；按照功率控制定值设置输出功率(P＝Pn*80％)，并生成控制事件，台区智能终端将事件上报住采集系统进行告警；
其中，Um表示越上限电压，Un表示额定电压，U表示正常电压；
P表示输出功率，Pn表示额定功率。
8.根据权利要求2所述的一种应用于低压台区的分布式光伏逆变器控制策略，其特征在于，所述采集任务抄读数据项为光伏逆变器实时数据。
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