技术领域technical field
本实用新型涉及微电网技术领域，特别涉及一种智能变电站微电网系统。The utility model relates to the technical field of micro-grids, in particular to an intelligent substation micro-grid system.
背景技术Background technique
近几年微电网成为了国内外研究的热点，这类电网可以有效地就近消纳分布式能源发出的电能，不需要远距离的长途输配电，因此可以大大提高电能的利用率，实现就近发电就近用电。并且随着分布式发电技术的不断进步，微电网成为了未来电网的一个发展趋势。In recent years, micro-grid has become a research hotspot at home and abroad. This type of grid can effectively absorb the electric energy generated by distributed energy sources nearby, and does not require long-distance long-distance transmission and distribution. Therefore, it can greatly improve the utilization rate of electric energy and realize the nearby Generate electricity nearby. And with the continuous advancement of distributed power generation technology, microgrid has become a development trend of the future power grid.
中国专利公开号CN203423531 U，公开日2014年2月5日，实用新型创造的名称为光电建筑微电网管理系统，该申请案公开了光电建筑微电网管理系统，它包括太阳能光伏方阵，在负载与市电电网之间设双向逆变器，与太阳能光伏方阵相连接的并网逆变器并联在双向逆变器的输出端，双向逆变器还与储能装置相连接，集成了光伏、储能、市电一体化循环利用的能量优化管理系统。其不足之处在于仅考虑了光伏发电的情况，未能考虑其他发电形式的电能处理方案，并且未能对管理方案做进一步的说明，不利于行业内人员的具体实现。Chinese Patent Publication No. CN203423531 U, the public date is February 5, 2014, the name created by the utility model is the photoelectric building micro-grid management system, the application discloses the photoelectric building micro-grid management system, which includes a solar photovoltaic square array, in the load A bidirectional inverter is installed between the mains grid, and the grid-connected inverter connected to the solar photovoltaic square array is connected in parallel to the output end of the bidirectional inverter. The bidirectional inverter is also connected to the energy storage device, integrating photovoltaic , energy storage, integrated recycling of mains energy energy optimization management system. Its shortcoming is that it only considers the situation of photovoltaic power generation, and fails to consider other power generation forms of electric energy processing solutions, and fails to make further explanations on the management plan, which is not conducive to the specific realization of personnel in the industry.
实用新型内容Utility model content
本实用新型的目的在于解决上述现有技术存在的未能综合考虑多种发电方式相结合的发电系统的电能输出问题，提供了一种具体可实现的智能变电站微电网系统。The purpose of the utility model is to solve the power output problem of the power generation system that fails to comprehensively consider the combination of multiple power generation methods in the above-mentioned prior art, and to provide a specific and realizable smart substation micro-grid system.
本实用新型解决其技术问题所采用的技术方案是：一种智能变电站微电网系统，包括：储能系统和发电系统、微电网中央控制单元；所述微电网中央控制单元，与发电系统和储能系统连接，将发电系统的电能传送至储能系统；所述发电系统包括至少一种发电方式；所述储能系统包括：能量管理系统和储能系统管理单元、若干电池在线监测模块、电池组端监测模块以及储能电池组；所述能量管理系统，与储能系统管理单元连接；储能系统管理单元，与微电网中央控制单元连接，接收微电网中央控制单元的控制命令；电池组端监测模块，与储能系统管理单元连接，监测储能电池组的充放电电流、浮充电流、总电压；储能电池组包括若干储能电池，与电池组端监测模块连接；每个储能电池与对应的电池组端监测模块连接。The technical solution adopted by the utility model to solve its technical problems is: a smart substation micro-grid system, including: an energy storage system, a power generation system, and a micro-grid central control unit; The energy system is connected to transmit the electric energy of the power generation system to the energy storage system; the power generation system includes at least one power generation method; the energy storage system includes: an energy management system and an energy storage system management unit, several battery online monitoring modules, battery The group end monitoring module and the energy storage battery pack; the energy management system is connected with the energy storage system management unit; the energy storage system management unit is connected with the microgrid central control unit and receives the control command from the microgrid central control unit; the battery pack The end monitoring module is connected with the energy storage system management unit to monitor the charge and discharge current, floating charge current, and total voltage of the energy storage battery pack; the energy storage battery pack includes several energy storage batteries, which are connected to the battery pack end monitoring module; each The battery can be connected to the corresponding battery pack end monitoring module.
本实用新型中，智能变电站微电网系统融合直流系统和电池在线监测、光伏发电和风力发电，将变电站交直流一体化电源与发电系统相结合，充分利用一体化电源蓄电池作为储能系统，通过储能双向变流器替代直流系统电源模块，对蓄电池进行充放电控制。蓄电池组放电过程保持最低SOC为50%（或计算合理比例），以备所用电直流系统安全用电保障。微网中央控制单元实现微电网稳定运行，完成联网状态下电压稳定控制，离网状态下电压和频率控制；多目标多源与负荷协调控制；保护和紧急控制，完成保护和智能设备协调控制、紧急快速响应；并网/离网下稳定控制与并离网平滑切换等。In the utility model, the smart substation micro-grid system integrates the DC system and battery on-line monitoring, photovoltaic power generation and wind power generation, combines the AC-DC integrated power supply of the substation with the power generation system, and fully utilizes the integrated power battery as an energy storage system. The bidirectional converter can replace the power module of the DC system to control the charge and discharge of the battery. Keep the minimum SOC of 50% (or calculate a reasonable ratio) during the discharge process of the battery pack to ensure the safe use of electricity in the DC system used. The micro-grid central control unit realizes the stable operation of the micro-grid, completes the voltage stability control in the networked state, the voltage and frequency control in the off-grid state; multi-target multi-source and load coordinated control; protection and emergency control, completes protection and intelligent equipment coordinated control, Emergency quick response; grid-connected/off-grid stability control and smooth switching between grid-connected and off-grid.
作为优选，所述电池组端监测模块通过霍尔电流传感器与储能电池组连接。Preferably, the battery pack end monitoring module is connected to the energy storage battery pack through a Hall current sensor.
作为优选，所述储能电池为蓄电池。Preferably, the energy storage battery is an accumulator.
作为优选，所述蓄电池为铅碳蓄电池。Preferably, the battery is a lead-carbon battery.
作为优选，所述储能电池采用串联连接。Preferably, the energy storage batteries are connected in series.
作为优选，所述储能电池通过储能变流器与发电系统输出母线连接。Preferably, the energy storage battery is connected to the output bus of the power generation system through an energy storage converter.
本实用新型中，通过储能变流器控制储能电池的充放电。In the utility model, the charging and discharging of the energy storage battery is controlled through the energy storage converter.
作为优选，所述发电系统包括光伏发电系统和风力发电系统。Preferably, the power generation system includes a photovoltaic power generation system and a wind power generation system.
作为优选，所述风力发电系统包括：风力机组模块：捕获风能并将风能转化为交变电能，包括风力发电机组、塔架、地基以及线缆；并网控制模块：内置输出直流电并对输出最高电压进行限制的整流模块，还包括并网控制器、泄荷器以及线缆；逆变模块：包括并网逆变器以及线缆，与所述整流模块连接，将整流模块输出的直流电逆变成交流电并馈入电网；监控模块：与风力机组模块、并网控制模块以及逆变模块连接，包括远程监控装置、通信GPRS卡以及线缆。Preferably, the wind power generation system includes: a wind turbine module: captures wind energy and converts wind energy into alternating electric energy, including wind turbines, towers, foundations, and cables; The voltage-limited rectifier module also includes a grid-connected controller, a discharger, and cables; the inverter module: includes a grid-connected inverter and cables, connected to the rectifier module, and inverts the DC output from the rectifier module Generate alternating current and feed it into the grid; monitoring module: connected with wind turbine module, grid-connected control module and inverter module, including remote monitoring device, communication GPRS card and cables.
本实用新型中，风能并网发电系统是利用风力发电机组将风能转换为交流电能，风力发电机输出的幅值、频率均不稳定的交流电，经过控制器整流成直流电后输出给逆变电源，由逆变电源转换成幅值、频率均稳定的交流电，经过电度表计量后，直接馈入直流电逆变为AC380V、50Hz的三相交流电。In the utility model, the wind energy grid-connected power generation system uses wind power generators to convert wind energy into AC power, and the amplitude and frequency of the output of the wind power generator are unstable AC, which is rectified by the controller into DC and then output to the inverter power supply. It is converted into alternating current with stable amplitude and frequency by the inverter power supply. After being measured by the watt-hour meter, it is directly fed into the direct current and inverted into three-phase alternating current of AC380V and 50Hz.
本实用新型的实质性效果：综合考虑多种发电方式相结合的发电系统与储能系统相结合的微电网系统，通过储能变流器对储能电池进行充放电控制，通过微网中央控制单元控制联网状态下和离网状态下的电压和频率。所用变供电故障或检修时，所用供电系统孤网运行，由发电系统和储能系统作为系统主电源，当负荷用电量大于系统发电量，由微网中央控制单元快速进行次要负荷切除，保证重要负荷的供电。所用变供电恢复后，所用供电系统连接到电网，实现微电网离网到并网模式的切换，恢复所有负荷供电。The substantive effect of the utility model: a microgrid system combining a power generation system with a combination of multiple power generation methods and an energy storage system is comprehensively considered, and the energy storage battery is controlled by the energy storage converter, and the central control of the microgrid The unit controls voltage and frequency both on-grid and off-grid. When the substation power supply fails or is overhauled, the power supply system used is operated in an isolated grid, and the power generation system and energy storage system are used as the main power supply of the system. When the power consumption of the load is greater than the power generation of the system, the central control unit of the microgrid quickly performs secondary load shedding. Guarantee the power supply of important loads. After the used substation power supply is restored, the used power supply system is connected to the grid to realize the switching of the microgrid from off-grid to grid-connected mode, and restore power supply to all loads.
附图说明Description of drawings
图1为本实用新型的一种系统结构图。Fig. 1 is a kind of system structural diagram of the utility model.
图中：1-发电系统，2-微电网中央控制单元，3-储能系统，31-能量管理系统，32-储能系统管理单元，33-电池组端监测模块，34-霍尔电流传感器，35-储能电池，36-电池在线监测模块，4-储能变流器。In the figure: 1-power generation system, 2-microgrid central control unit, 3-energy storage system, 31-energy management system, 32-energy storage system management unit, 33-battery pack end monitoring module, 34-Hall current sensor , 35-energy storage battery, 36-battery online monitoring module, 4-energy storage converter.
具体实施方式Detailed ways
下面通过具体实施例，并结合附图，对本实用新型的技术方案作进一步的具体说明。The technical solutions of the present utility model will be further specifically described below through specific embodiments in conjunction with the accompanying drawings.
一种智能变电站微电网系统，如图1所示，包括：储能系统和发电系统、微电网中央控制单元；所述微电网中央控制单元，与发电系统和储能系统连接，将发电系统的电能传送至储能系统；所述发电系统包括至少一种发电方式；所述储能系统包括：能量管理系统和储能系统管理单元、若干电池在线监测模块、电池组端监测模块以及储能电池组；所述能量管理系统，与储能系统管理单元连接；储能系统管理单元，与微电网中央控制单元连接，接收微电网中央控制单元的控制命令；电池组端监测模块，与储能系统管理单元连接，监测储能电池组的充放电电流、浮充电流、总电压；电池组端监测模块通过霍尔电流传感器与储能电池组连接；储能电池组包括若干储能电池，与电池组端监测模块连接；每个储能电池与对应的电池组端监测模块连接。A smart substation micro-grid system, as shown in Figure 1, includes: an energy storage system, a power generation system, and a micro-grid central control unit; the micro-grid central control unit is connected to the power generation system and the energy storage system, and the The electric energy is transmitted to the energy storage system; the power generation system includes at least one power generation method; the energy storage system includes: an energy management system and an energy storage system management unit, several battery online monitoring modules, a battery pack terminal monitoring module, and an energy storage battery group; the energy management system is connected with the energy storage system management unit; the energy storage system management unit is connected with the central control unit of the microgrid, and receives the control command from the central control unit of the microgrid; the battery group end monitoring module is connected with the energy storage system The management unit is connected to monitor the charge and discharge current, floating charge current, and total voltage of the energy storage battery pack; the battery pack terminal monitoring module is connected to the energy storage battery pack through a Hall current sensor; the energy storage battery pack includes several energy storage batteries, and the battery The group end monitoring module is connected; each energy storage battery is connected to the corresponding battery group end monitoring module.
储能电池为铅碳蓄电池，电池组端监测模块通过霍尔电流传感器第一个铅碳蓄电池连接，其他铅碳蓄电池相互之间采用串联连接，最后一个铅碳蓄电池通过储能变流器与发电系统的输出母线连接，发电系统包括光伏发电系统和风力发电系统。The energy storage battery is a lead-carbon battery, and the monitoring module at the battery pack end is connected to the first lead-carbon battery through a Hall current sensor. The output bus bar of the system is connected, and the power generation system includes a photovoltaic power generation system and a wind power generation system.
并网期间，微电网发电系统的发电只占厂站用电的一部分，在离网瞬间，各发电系统和蓄电池来不及调节出力或者即使全部最大化发电也无法满足所有站用变负荷用电，导致能源局域网内频率无法维持。针对这种情况，微网中央控制单元在并网运行时，实时计算系统功率差额，并规划如果发生离网，各发电系统和蓄电池电源的出力计划、各负荷的投切计划，一旦检测微电网离网，则立即执行已定控制计划。During the grid-connection period, the power generation of the micro-grid power generation system only accounts for a part of the power consumption of the plant. At the moment of off-grid, each power generation system and storage battery have no time to adjust the output, or even if the power generation is fully maximized, it cannot meet the variable load power consumption of all stations, resulting in The frequency in the energy local area network cannot be maintained. In response to this situation, the central control unit of the microgrid calculates the power balance of the system in real time when it is connected to the grid, and plans the output plan of each power generation system and battery power supply, and the switching plan of each load in the event of off-grid. Once the microgrid is detected If off-grid, implement the established control plan immediately.
1）储能系统管理单元检测到电网电压降低或者收到离网命令后，检测流过快速开关的电流峰值或有效值。如果流过快速开关的电流大于允许切换电流阈值，储能系统管理单元以当前电流参考与并网电流的偏差值作为储能逆变器输出电流参考指令，在快速开关关断前尽快降低微电网与电网之间联络线上电流；1) After the management unit of the energy storage system detects that the grid voltage drops or receives an off-grid command, it detects the peak value or effective value of the current flowing through the fast switch. If the current flowing through the fast switch is greater than the allowable switching current threshold, the energy storage system management unit uses the deviation value between the current reference current and the grid-connected current as the energy storage inverter output current reference command, and reduces the microgrid as soon as possible before the fast switch is turned off. The current on the connection line with the grid;
2）当储能系统管理单元检测到并网电流小于允许切换电流阈值后，下达快速开关关断指令，同时储能系统管理单元进行控制模式切换，由电流控制切换至电压控制。在微电网运行模式切换过程中，从电源始终运行在电流控制模式下。2) When the energy storage system management unit detects that the grid-connected current is less than the allowable switching current threshold, it issues a fast switch shutdown command, and at the same time the energy storage system management unit switches the control mode from current control to voltage control. During the switching process of the microgrid operation mode, the slave power supply always operates in the current control mode.
电网恢复正常后，微电网需要重新并网运行。微电网并网运行前应首先保证快速开关两侧的电压幅值、相位和频率相等，同时还应减小切换后的电流冲击，具体的独立至并网运行模式无缝切换控制逻辑如下：After the power grid returns to normal, the microgrid needs to be connected to the grid again. Before the grid-connected operation of the microgrid, it is necessary to ensure that the voltage amplitude, phase and frequency on both sides of the fast switch are equal, and at the same time, the current impact after switching should be reduced. The specific independent to grid-connected operation mode seamless switching control logic is as follows:
1）储能系统管理单元检测到电网电压正常后，以当前电网电压作为控制器的输出电压参考，不断调整其输出使快速开关两侧的电压相位和幅值相同；1) After the energy storage system management unit detects that the grid voltage is normal, it takes the current grid voltage as the output voltage reference of the controller, and constantly adjusts its output to make the voltage phase and amplitude on both sides of the fast switch the same;
2）当储能系统管理单元检测到快速开关两侧电压满足并网条件后，下达快速开关合闸指令，同时储能系统管理单元进行控制模式切换，由电压控制切换至电流控制。在微电网运行模式切换过程中，从电源始终运行在电流控制模式下。当微电网运行模式切换完成后，根据微电网能量管理系统控制储能出力和增加分布式发电系统出力。微电网系统通过第三所用变为工业园区和所外用电设备供电，实现电能共享。2) When the energy storage system management unit detects that the voltage on both sides of the fast switch meets the grid-connection conditions, it issues a fast switch closing command, and at the same time the energy storage system management unit switches the control mode from voltage control to current control. During the switching process of the microgrid operation mode, the slave power supply always operates in the current control mode. After the microgrid operation mode switching is completed, the energy storage output is controlled and the output of the distributed generation system is increased according to the microgrid energy management system. The microgrid system supplies power to the industrial park and external electrical equipment through the third station to realize power sharing.
所述风力发电系统包括：风力机组模块：捕获风能并将风能转化为交变电能，包括风力发电机组、塔架、地基以及线缆；并网控制模块：内置输出直流电并对输出最高电压进行限制的整流模块，还包括并网控制器、泄荷器以及线缆；逆变模块：包括并网逆变器以及线缆，与所述整流模块连接，将整流模块输出的直流电逆变成交流电并馈入电网；监控模块：与风力机组模块、并网控制模块以及逆变模块连接，包括远程监控装置、通信GPRS卡以及线缆。The wind power generation system includes: wind turbine module: captures wind energy and converts wind energy into alternating electric energy, including wind turbines, towers, foundations and cables; grid-connected control module: built-in output direct current and limits the maximum output voltage The rectifier module also includes a grid-connected controller, a load discharger, and cables; the inverter module: includes a grid-connected inverter and cables, connected to the rectifier module, and inverts the direct current output by the rectifier module into alternating current and Feed into the grid; monitoring module: connected with wind turbine module, grid-connected control module and inverter module, including remote monitoring device, communication GPRS card and cables.
并网逆变器输出交流电汇总到低压交流开关柜，与变电所内的AC380V端并联，系统采用220/380VAC三相五线制输出，直接与配电室变压器二次端并网运行。风能并网发电系统具有逆功率保护、防孤岛、短路过流、过压等保护功能，确保风能系统安全、可靠的发电并网运行。系统三相额定平衡负载时输出电流最大总波形畸变率小于5%、各次谐波含有率小于3%。The AC output of the grid-connected inverter is aggregated to the low-voltage AC switch cabinet, and connected in parallel with the AC380V terminal in the substation. The system adopts 220/380VAC three-phase five-wire output, and directly runs in parallel with the secondary terminal of the transformer in the power distribution room. The wind energy grid-connected power generation system has protection functions such as reverse power protection, anti-islanding, short-circuit overcurrent, and overvoltage to ensure safe and reliable power generation and grid-connected operation of the wind energy system. When the system is under rated three-phase balanced load, the maximum total waveform distortion rate of the output current is less than 5%, and the harmonic content rate of each order is less than 3%.
以上所述实施例只是本实用新型的一种较佳的方案，并非对本实用新型作任何形式上的限制，在不超出权利要求所记载的技术方案的前提下还有其他的变体及改型。The above-described embodiment is only a preferred solution of the utility model, and does not limit the utility model in any form. There are other variations and modifications under the premise of not exceeding the technical solution described in the claims. .
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720727373.8UCN207150185U (en) | 2017-06-22 | 2017-06-22 | A kind of intelligent substation micro-grid system |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720727373.8UCN207150185U (en) | 2017-06-22 | 2017-06-22 | A kind of intelligent substation micro-grid system |
| Publication Number | Publication Date |
|---|---|
| CN207150185Utrue CN207150185U (en) | 2018-03-27 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720727373.8UExpired - Fee RelatedCN207150185U (en) | 2017-06-22 | 2017-06-22 | A kind of intelligent substation micro-grid system |
| Country | Link |
|---|---|
| CN (1) | CN207150185U (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107230995A (en)* | 2017-06-22 | 2017-10-03 | 国网浙江省电力公司嘉兴供电公司 | A kind of intelligent substation micro-grid system |
| CN110867734A (en)* | 2019-11-18 | 2020-03-06 | 南京鑫宜科技有限公司 | Intelligent micro-grid system remote control device based on bifurcation theory |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107230995A (en)* | 2017-06-22 | 2017-10-03 | 国网浙江省电力公司嘉兴供电公司 | A kind of intelligent substation micro-grid system |
| CN110867734A (en)* | 2019-11-18 | 2020-03-06 | 南京鑫宜科技有限公司 | Intelligent micro-grid system remote control device based on bifurcation theory |
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| Date | Code | Title | Description |
|---|---|---|---|
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information | Inventor after:Shen Yiping Inventor after:Wu Qinfang Inventor after:Qiu Qunhui Inventor after:Wei Min Inventor after:Liu Yuqing Inventor after:Wei Peng Inventor after:Zhou Jianqi Inventor after:Mo Jiajie Inventor after:Zhang Zhifang Inventor after:Xu Yongming Inventor after:Shen Hongfeng Inventor after:Li Yuanfeng Inventor after:Wen Zhen Inventor after:Xiao Zhiyu Inventor before:Shen Yiping Inventor before:Wu Weijiang Inventor before:Liu Yuqing Inventor before:Xiao Zhiyu Inventor before:Wu Zhengqing Inventor before:Peng Jin Inventor before:Shen Hongfeng Inventor before:Mo Jiajie Inventor before:Zhang Zhifang Inventor before:Li Yuanfeng Inventor before:Wen Zhen Inventor before:Xia Qiangfeng Inventor before:Xu Yongming Inventor before:Wei Min | |
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee | Granted publication date:20180327 Termination date:20200622 |