CN115912320A - A photovoltaic DC power supply system - Google Patents
A photovoltaic DC power supply system Download PDFInfo
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
本发明涉及一种光伏直流供电系统，属于电力电子技术领域。本发明的光伏直流变压器控制装置的供电系统，利用DC/DC变换器将直流母线中的高压直流电转换为低压直流电，然后采用低压直流电对电池组进行充电储能，最后将电池组的输出电流作为供电电流或者将充电电池的输出电流转换为指定电压的交流电后作为供电电流对光伏场站中负载进行供电，可以解决目前光伏变电站控制装置采用市电供电时存在供电电缆较长而导致成本较高、安全运行受到威胁的问题，并且由于采用电池组作为供电源，提高了供电的可靠性和稳定性。
The invention relates to a photovoltaic DC power supply system, which belongs to the technical field of power electronics. The power supply system of the photovoltaic DC transformer control device of the present invention uses a DC/DC converter to convert the high-voltage direct current in the direct-current bus into low-voltage direct current, then uses the low-voltage direct current to charge and store the battery pack, and finally uses the output current of the battery pack as The power supply current or the output current of the rechargeable battery is converted into alternating current of a specified voltage and used as the power supply current to supply power to the load in the photovoltaic field station, which can solve the problem of high cost caused by the long power supply cable when the photovoltaic substation control device is powered by mains power. , Safe operation is threatened, and because the battery pack is used as the power supply, the reliability and stability of the power supply are improved.
Description
技术领域technical field
本发明涉及一种光伏直流供电系统，属于电力电子技术领域。The invention relates to a photovoltaic DC power supply system, which belongs to the technical field of power electronics.
背景技术Background technique
光伏直流变压器包括光伏变流器，冷却设备，照明及光伏变电站控制装置。其中，光伏变电站控制装置是光伏直流变压器的核心设备，对供电电源的要求较高，即使在电源故障状态下，控制装置电源不允许失电，因此控制装置一般采用直流供电。冷却系统是光伏变流器的散热设备，一般是交流380V/220V供电，照明系统一般采用AC220V供电。Photovoltaic DC transformers include photovoltaic converters, cooling equipment, lighting and photovoltaic substation control devices. Among them, the photovoltaic substation control device is the core equipment of the photovoltaic DC transformer, and has high requirements on the power supply. Even in the state of power failure, the power supply of the control device is not allowed to lose power, so the control device generally adopts DC power supply. The cooling system is the heat dissipation equipment of the photovoltaic converter, which is generally powered by AC 380V/220V, and the lighting system is generally powered by AC220V.
目前，光伏变电站控制装置均由市电供电，光伏发电装置本身布置比较分散，相互间距离较远，采用市电供电需要很长的供电电缆，一方面导致增加建设单位的成本，另一方面过长的供电电缆也威胁着光伏直流变压器的安全运行。At present, the control devices of photovoltaic substations are all powered by mains power. The layout of photovoltaic power generation devices is relatively scattered and the distance between each other is relatively long. The use of mains power supply requires a long power supply cable. Long power supply cables also threaten the safe operation of photovoltaic DC transformers.
发明内容Contents of the invention
本发明的目的在于提供一种光伏直流供电系统，可用于对光伏场站中负载进行供电，可解决目前光伏变电站控制装置采用市电供电时存在供电电缆较长而导致成本较高、安全运行受到威胁的问题。The purpose of the present invention is to provide a photovoltaic DC power supply system, which can be used to supply power to the loads in the photovoltaic field station, and can solve the problems of high cost and safety operation caused by long power supply cables when the current photovoltaic substation control device is powered by mains power. threat issue.
为了实现上述目的，本发明的光伏直流供电系统所采用的技术方案为：In order to achieve the above purpose, the technical solution adopted by the photovoltaic DC power supply system of the present invention is:
一种光伏直流供电系统，包括至少一个DC/DC变换器和至少一个DC/AC变换器，DC/DC变换器的一端用于连接光伏汇集直流母线，另一端连接到直流输出母线上，DC/AC变换器的直流侧连接到所述直流输出母线上，DC/AC变换器的交流侧用于连接交流负载；所述DC/DC变换器与直流输出母线之间还设置有电池组，电池组由DC/DC变换器充电，电池组向所述直流输出母线放电。A photovoltaic DC power supply system, including at least one DC/DC converter and at least one DC/AC converter, one end of the DC/DC converter is used to connect to the photovoltaic collection DC bus, and the other end is connected to the DC output bus, the DC/DC The DC side of the AC converter is connected to the DC output bus, and the AC side of the DC/AC converter is used to connect the AC load; a battery pack is also arranged between the DC/DC converter and the DC output bus, and the battery pack Charged by the DC/DC converter, the battery pack discharges to the DC output bus.
本发明的光伏直流供电系统，利用DC/DC变换器将直流母线中的高压直流电转换为低压直流电，然后采用低压直流电对电池组进行充电储能，最后将电池组的输出电流作为供电电流或者将充电电池的输出电流转换为指定电压的交流电后作为供电电流对光伏场站中负载进行供电，可以解决目前光伏变电站控制装置采用市电供电时存在供电电缆较长而导致成本较高、安全运行受到威胁的问题，并且由于采用电池组作为供电源，提高了供电的可靠性和稳定性。In the photovoltaic DC power supply system of the present invention, a DC/DC converter is used to convert the high-voltage direct current in the DC bus into low-voltage direct current, and then the low-voltage direct current is used to charge and store the battery pack, and finally the output current of the battery pack is used as the power supply current or the The output current of the rechargeable battery is converted into alternating current of a specified voltage and used as the power supply current to supply power to the loads in the photovoltaic field station, which can solve the problem of high cost and safety operation problems caused by long power supply cables when the photovoltaic substation control device is powered by mains power. Threat problem, and because the battery pack is used as the power supply, the reliability and stability of the power supply are improved.
优选地，所述DC/DC变换器与电池组之间的电路上设置有单向二极管。Preferably, a unidirectional diode is provided on the circuit between the DC/DC converter and the battery pack.
优选地，所述DC/AC变换器至少有两个，各DC/AC变换器的直流侧均连接到直流输出母线上。当其中一组DC/DC变换器出现故障，不影响其他组DC/DC变换器的运行，确保充电电池能够一直在充电储能，提高了对光伏直流变压器控制装置供电的可靠性。Preferably, there are at least two DC/AC converters, and the DC side of each DC/AC converter is connected to the DC output bus. When one of the DC/DC converters fails, it does not affect the operation of other DC/DC converters, ensuring that the rechargeable battery can be charged and stored all the time, improving the reliability of power supply to the photovoltaic DC transformer control device.
优选地，所述DC/DC变换器至少有两个，各DC/DC变换器的输入端均用于连接光伏汇集直流母线，各DC/DC变换器的输出端并联后与电池组连接。Preferably, there are at least two DC/DC converters, the input ends of each DC/DC converter are used to connect to the photovoltaic collection DC bus, and the output ends of each DC/DC converter are connected in parallel to the battery pack.
优选地，所述直流输出母线上设置有直流负载连接端，用于连接直流负载，为直流负载供电。Preferably, a DC load connection terminal is provided on the DC output bus for connecting to a DC load and supplying power to the DC load.
附图说明Description of drawings
图1为实施例1的光伏直流供电系统的示意图。FIG. 1 is a schematic diagram of a photovoltaic DC power supply system in Embodiment 1.
具体实施方式Detailed ways
下面结合具体实施例对本发明的技术方案进行进一步说明。The technical solutions of the present invention will be further described below in conjunction with specific embodiments.
实施例1Example 1
本实施例的光伏直流供电系统，如图1所示，包括两个DC/DC变换器和两个DC/AC变换器，各DC/DC变换器的输入端(直流侧)均用于连接低压侧光伏汇集直流母线，各DC/DC变换器的输出端(交流侧)并联后与电池组连接，电池组由DC/DC变换器充电，电池组向直流输出母线放电；各DC/DC变换器与电池组之间的电路上均设置有单向二极管；各DC/AC变换器的直流侧均连接到直流输出母线上，各DC/AC变换器的交流侧均用于连接交流负载；直流输出母线上设置有直流负载连接端，用于连接直流负载，为直流负载供电。The photovoltaic DC power supply system of this embodiment, as shown in Figure 1, includes two DC/DC converters and two DC/AC converters, and the input terminals (DC side) of each DC/DC converter are used to connect low-voltage The side photovoltaics collect the DC bus, and the output terminals (AC side) of each DC/DC converter are connected in parallel to the battery pack, the battery pack is charged by the DC/DC converter, and the battery pack discharges to the DC output bus; each DC/DC converter There are one-way diodes on the circuit between the battery pack; the DC side of each DC/AC converter is connected to the DC output bus, and the AC side of each DC/AC converter is used to connect to the AC load; the DC output A DC load connection terminal is arranged on the bus for connecting the DC load and supplying power to the DC load.
本实施例中采用两个DC/DC变换器，每个DC/DC变换器与电池组之间的电路上均设置有单向二极管，当其中一个DC/DC变换器出现故障时，不影响另一个DC/DC变换器的运行，可确保电池组始终在充电，提高了供电的可靠性。In this embodiment, two DC/DC converters are used, and a unidirectional diode is arranged on the circuit between each DC/DC converter and the battery pack. When one of the DC/DC converters fails, the other will not be affected. The operation of a DC/DC converter ensures that the battery pack is always charged, improving the reliability of the power supply.
下面对本实施例的光伏直流供电系统的工作原理进行介绍，DC/DC变换器将光伏汇集直流母线中的1500V高压直流电转换为220V低压直流电，220V低压直流电对电池组进行充电储能，电池组的输出端连接有光伏直流变压器控制装置的直流负载，并且通过DC/AC变换器分别连接有工作电压为220V和380V的交流负载；与工作电压为220V的交流负载连接的DC/AC变换器是将电压为220V的直流电转换为电压为220V的交流电，与工作电压为380V的交流负载连接的DC/AC变换器是将电压为220V的直流电转换为电压为380V的交流电。The following is an introduction to the working principle of the photovoltaic DC power supply system of this embodiment. The DC/DC converter converts the 1500V high-voltage direct current in the photovoltaic collection DC bus into 220V low-voltage direct current, and the 220V low-voltage direct current charges and stores the battery pack. The output end is connected to the DC load of the photovoltaic DC transformer control device, and the DC/AC converter is respectively connected to the AC load with the working voltage of 220V and 380V; the DC/AC converter connected to the AC load with the working voltage of 220V is the The DC with a voltage of 220V is converted into AC with a voltage of 220V, and the DC/AC converter connected to the AC load with a working voltage of 380V converts the DC with a voltage of 220V into an AC with a voltage of 380V.
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| CN202211517748.XA CN115912320A (en) | 2022-11-29 | 2022-11-29 | A photovoltaic DC power supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116923707A (en) * | 2023-05-31 | 2023-10-24 | 中国航发湖南动力机械研究所 | Flight emergency power supply system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106134507B (en) * | 2008-06-27 | 2012-06-27 | 北京卫星制造厂 | A kind of DC/DC converter of redundant configuration |
| CN104052082A (en) * | 2014-06-25 | 2014-09-17 | 国家电网公司 | Off-grid and grid-connected operation light and storage joint power supply system |
| CN205646811U (en) * | 2016-05-24 | 2016-10-12 | 中广核太阳能开发有限公司 | Photovoltaic directly exchanges and mixes little grid system |
| CN206283317U (en) * | 2016-12-30 | 2017-06-27 | 国家电网公司 | A kind of transformer station's AC/DC integrated power-supply system |
| CN107968476A (en) * | 2017-12-26 | 2018-04-27 | 刘寒 | Variable photovoltaic module voltage is configured with storage battery in photovoltaic generation energy-storage system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106134507B (en) * | 2008-06-27 | 2012-06-27 | 北京卫星制造厂 | A kind of DC/DC converter of redundant configuration |
| CN104052082A (en) * | 2014-06-25 | 2014-09-17 | 国家电网公司 | Off-grid and grid-connected operation light and storage joint power supply system |
| CN205646811U (en) * | 2016-05-24 | 2016-10-12 | 中广核太阳能开发有限公司 | Photovoltaic directly exchanges and mixes little grid system |
| CN206283317U (en) * | 2016-12-30 | 2017-06-27 | 国家电网公司 | A kind of transformer station's AC/DC integrated power-supply system |
| CN107968476A (en) * | 2017-12-26 | 2018-04-27 | 刘寒 | Variable photovoltaic module voltage is configured with storage battery in photovoltaic generation energy-storage system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116923707A (en) * | 2023-05-31 | 2023-10-24 | 中国航发湖南动力机械研究所 | Flight emergency power supply system |
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