技术领域technical field
本发明涉及储能系统技术领域，特别涉及一种接有储能系统的变配电站。The invention relates to the technical field of energy storage systems, in particular to a transformation and distribution station connected with an energy storage system.
背景技术Background technique
随着社会经济的发展，对电力的依赖程度越来越大。一方面，电网负荷迅速增长，峰谷差不断加大，而电网的发电厂以火电为主，调峰能力受到限制且调峰成本较高，同时电厂的建设规模必须满足负荷高峰时的用电需求，使得投资效率较低。另一方面，某些地区一次能源匮乏，市内没有煤炭、水能资源，风能资源有限，所需一次能源基本上由市外输入。With the development of social economy, the dependence on electricity is increasing. On the one hand, the grid load is increasing rapidly, and the peak-to-valley difference is constantly increasing, while the power plants of the grid are mainly thermal power, the peak-shaving capacity is limited and the peak-shaving cost is high, and the construction scale of the power plant must meet the power consumption during the peak load Demand makes investment less efficient. On the other hand, primary energy is scarce in some areas, there are no coal and water resources in the city, and wind energy resources are limited, so the required primary energy is basically imported from outside the city.
由于电厂的建设受到限制，本地电源容量不足，越来越倚重外来电力，安全稳定问题日益突出，当对供电可靠性要求较高时，需要利用新的技术提高电网的供电可靠性。As the construction of power plants is limited, the local power supply capacity is insufficient, more and more rely on external power, and the security and stability problems are becoming more and more prominent. When the reliability of power supply is high, it is necessary to use new technologies to improve the reliability of power supply of the power grid.
为了满足日益增长的用电需求，减少发电厂的建设规模，如何才能提高能源利用效率，并且保证可再生能源系统的稳定供电，提高电网对关键用户的供电可靠性，寻求技术经济可行的储能技术，对电网的可持续发展极为重要。In order to meet the growing demand for electricity and reduce the construction scale of power plants, how can we improve energy utilization efficiency, ensure the stable power supply of renewable energy systems, improve the reliability of power supply for key users, and seek technically and economically feasible energy storage Technology is extremely important to the sustainable development of the power grid.
现有的储能系统接入变配电站的方案仅局限于接入变配电站低压侧出线间隔，而110kV及以上变配电站却无配电功能。所以有必要进行储能元件在110kV及以下变配电站中的接入方案研究，解决本领域技术人员一直以来无法解决的技术困扰。The existing solutions for connecting energy storage systems to substations and distribution stations are limited to accessing the low-voltage side of the substations and distribution stations, while 110kV and above substations have no power distribution function. Therefore, it is necessary to conduct research on the connection scheme of energy storage components in substations of 110kV and below to solve the technical problems that have been unable to be solved by those skilled in the art.
发明内容Contents of the invention
有鉴于现有技术的上述缺陷，本发明提供一种能接入110kV及以下变配电站，进而为用户侧提供应急电源、变地削峰填谷平滑变配电站负荷功能的一种接有储能系统的变配电站，所述变配电站(例如110(35)kV变配电站)通过数台降压变压器向低压侧(指变配电站的低压侧)供电，每台所述降压变压器的低压侧出线分别经一出线开关柜引出接至用户负荷侧，其特点在于，所述变配电站的低压侧母线还连接一电池储能系统，所述电池储能系统包括：一用于输出直流电信号的蓄电池组、一用于将直流电转换为三相交流电的DC/AC变流器及一用于升压的升压变压器，所述蓄电池组经所述DC/AC变流器接入所述升压变压器的低压侧，并且通过所述升压变压器接入所述变配电站的10kV一段电网。In view of the above-mentioned defects of the prior art, the present invention provides an interface that can be connected to a substation of 110kV and below, and then provide emergency power supply for the user side, change the load of the substation and smooth the load of the substation. A substation with an energy storage system. The substation (such as a 110 (35) kV substation) supplies power to the low-voltage side (referring to the low-voltage side of the substation) through several step-down transformers. The low-voltage side outgoing lines of the step-down transformer are respectively connected to the user's load side through an outgoing switch cabinet. The system includes: a battery pack for outputting direct current signals, a DC/AC converter for converting direct current into three-phase alternating current, and a step-up transformer for boosting the voltage. The battery pack passes through the DC/AC The AC converter is connected to the low-voltage side of the step-up transformer, and connected to the 10kV section of the power grid of the substation through the step-up transformer.
在一些实施例中，所述电池储能系统通过一10kV出线开关柜接入所述10kV一段电网的低压侧母线，用来作为10kV一段电网的应急电源或削峰填谷电源。In some embodiments, the battery energy storage system is connected to the low-voltage side bus bar of the 10kV power grid through a 10kV outlet switchgear, and is used as an emergency power supply or a peak-shaving and valley-filling power supply for the 10kV power grid.
在一些实施例中，所述电池储能系统通过一10kV出线开关柜与所述10kV一段电网的用户供电的出线端相连，用来保证重要负荷的应急供电。In some embodiments, the battery energy storage system is connected to the user-supplied outlet of the 10kV power grid through a 10kV outlet switchgear to ensure emergency power supply for important loads.
在一些实施例中，所述电池储能系统通过一10kV出线开关柜接入一应急母线，所述应急母线分别通过一开关柜与所述10kV一段电网、所述变配电站的10kV二段电网的用户供电的出线端相连，用来同时保证两段不同供电场所的应急供电。In some embodiments, the battery energy storage system is connected to an emergency busbar through a 10kV outlet switchgear, and the emergency busbar is connected to the 10kV first-stage power grid and the 10kV second-stage power grid of the substation respectively through a switchgear. The outlets of the user power supply of the power grid are connected to ensure the emergency power supply of two different power supply places at the same time.
在一些实施例中，所述DC/AC变流器为一三相PWM逆变器。“三相PWM逆变器”是一种常用的“DC/AC变流器”，PMW的意思是脉冲宽度调制，即Pulse-Width Modulation；数字信号处理芯片可以对其进行控制。In some embodiments, the DC/AC converter is a three-phase PWM inverter. "Three-phase PWM inverter" is a commonly used "DC/AC converter". PMW means pulse width modulation, that is, Pulse-Width Modulation; digital signal processing chips can control it.
在一些实施例中，所述升压变压器为一10/0.4kV变压器。本方案中的10/0.4kV变压器为市售可得。In some embodiments, the step-up transformer is a 10/0.4kV transformer. The 10/0.4kV transformer in this solution is commercially available.
在一些实施例中，所述蓄电池组为一钠硫蓄电池组。钠硫电池是目前唯一的一种同时完全适用于功率型储能和能量型储能的储能电池。由于钠硫电池以金属钠和单质硫分别为阳极和阴极，以beta一氧化铝为电解质，原材料丰富，价格低廉，和目前的各种液流电池以及锂离子电池等各种可能的储能电池相比，钠硫电池的原材料价格是最低廉的，而且相关的元素储量很高，不存在价格不稳定的因素。同时，钠硫电池具有高的比功率和比能量、温度稳定性以及无自放电等方面的突出优势，使得钠硫电池成为目前最具应用前景的储能电池。In some embodiments, the battery pack is a sodium sulfur battery pack. Sodium-sulfur battery is currently the only energy storage battery that is fully suitable for both power-type energy storage and energy-type energy storage. Since the sodium-sulfur battery uses metal sodium and elemental sulfur as the anode and cathode respectively, and beta alumina as the electrolyte, the raw materials are abundant and the price is low, and it is compatible with various current flow batteries and lithium-ion batteries and other possible energy storage batteries. In comparison, the price of raw materials for sodium-sulfur batteries is the cheapest, and the reserves of related elements are very high, so there is no factor of price instability. At the same time, sodium-sulfur batteries have outstanding advantages in terms of high specific power and specific energy, temperature stability, and no self-discharge, making sodium-sulfur batteries the most promising energy storage batteries at present.
在符合本领域常识的基础上，上述各优选条件，可任意组合，即得本发明各较佳实施例。On the basis of conforming to common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain preferred embodiments of the present invention.
本发明的有益效果：Beneficial effects of the present invention:
1、首先，本发明的电池储能系统可应用于110(35)kV及以下电压等级的变(配)站，起到为重要用户提供应急电源、就地削峰填谷平滑负荷的功能。1. First of all, the battery energy storage system of the present invention can be applied to substations (distribution) stations with a voltage level of 110 (35) kV and below, to provide emergency power for important users, and to smooth loads on the spot by peak-shaving and valley-filling.
2、另外，本发明能使电池储能系统能够在变配电站就地布置，起到为变、配电站重要用户提供应急电源、就地削峰填谷平滑变、配电站负荷等作用，为提高供电可靠性及电网可持续发展提供有力保障，为电池储能系统应用于电网建设起到引领作用。2. In addition, the present invention enables the battery energy storage system to be arranged locally in the substation and distribution station to provide emergency power supply for important users of the substation and distribution station, to cut peaks and fill valleys on the spot and to smoothly change the load of the distribution station, etc. It provides a strong guarantee for improving the reliability of power supply and the sustainable development of the power grid, and plays a leading role in the application of battery energy storage systems to power grid construction.
3、此外，本发明还有助于提高能源利用效率，并且保证可再生能源系统的稳定供电，提高电网对关键用户的供电可靠性，进而减小发电厂建设规模，从而获得较好的经济环境效益。3. In addition, the present invention also helps to improve energy utilization efficiency, ensure stable power supply of renewable energy systems, improve power supply reliability of power grids to key users, and further reduce the construction scale of power plants, thereby obtaining a better economic environment benefit.
以下将结合附图对本发明的构思、具体结构及产生的技术效果作进一步说明，以充分地了解本发明的目的、特征和效果。The idea, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention.
附图说明Description of drawings
图1为本发明应用于110(35)kV变配电站低压母线的主接线示意图。Fig. 1 is a schematic diagram of the main wiring of the present invention applied to the low-voltage bus of a 110 (35) kV substation.
图2为本发明电池储能系统的电气接线图。Fig. 2 is an electrical wiring diagram of the battery energy storage system of the present invention.
图3为电池储能系统接入110(35)kV变配电站的低压母线时的接线图。Figure 3 is the wiring diagram when the battery energy storage system is connected to the low-voltage busbar of the 110 (35) kV substation.
图4为将本发明电池储能系统接在重要用户出线时的电气接线图。Fig. 4 is an electrical wiring diagram when the battery energy storage system of the present invention is connected to an important user outlet.
图5为将本发明电池储能系统接在应急母线时的电气接线图。Fig. 5 is an electrical wiring diagram when the battery energy storage system of the present invention is connected to the emergency bus.
图6为本发明电池储能系统的电气原理图。Fig. 6 is an electrical schematic diagram of the battery energy storage system of the present invention.
图7为本发明电池储能系统的电气控制电路图。Fig. 7 is an electrical control circuit diagram of the battery energy storage system of the present invention.
图8为本发明储能系统用作削峰填谷时的效果仿真图。Fig. 8 is a simulation diagram of the effect of the energy storage system of the present invention when it is used for peak shaving and valley filling.
附图标记说明：110kV变配电站1、降压变压器2、出线开关柜3、Explanation of reference signs: 110kV substation and distribution station 1, step-down transformer 2, outlet switch cabinet 3,
电池储能系统4、PCS装置41、AC/DC变流器411、滤波器412、蓄电池组42、升压变压器43、battery energy storage system 4, PCS device 41, AC/DC converter 411, filter 412, battery pack 42, step-up transformer 43,
变压器T1、变压器t1、开关柜A1、开关柜B1、出线开关柜a2、出线开关柜an、10kV引线柜s1、Transformer T1, transformer t1, switch cabinet A1, switch cabinet B1, outlet switch cabinet a2, outlet switch cabinet an, 10kV lead cabinet s1,
出线开关柜a1、出线电缆la1、出线开关柜b1、出线电缆lb1、10kV出线开关柜S1、开关柜Sa1、开关柜Sb1Outgoing switchgear a1, outgoing cable la1, outgoing switchgear b1, outgoing cable lb1, 10kV outgoing switchgear S1, switchgear Sa1, switchgear Sb1
具体实施方式Detailed ways
下面举出较佳实施例，并结合附图来更清楚完整地说明本发明。The preferred embodiments are given below, and the present invention will be described more clearly and completely in conjunction with the accompanying drawings.
实施例1Example 1
有鉴于目前该领域缺乏储能系统接入变配电站的方案研究，本发明的目的是通过以下技术方案来实现的：In view of the current lack of research on solutions for energy storage systems connected to substations in this field, the purpose of the present invention is achieved through the following technical solutions:
储能技术主要作用是实现电能的储存和释放。电池储能(电化学储能)技术具有能量密度较高、使用寿命长、循环次数较多等特点，在电子设备、电动工具电源、电动汽车、储能电站以及其它储能领得到了广泛应用。The main function of energy storage technology is to realize the storage and release of electric energy. Battery energy storage (electrochemical energy storage) technology has the characteristics of high energy density, long service life, and more cycles, and has been widely used in electronic equipment, electric tool power supplies, electric vehicles, energy storage power stations, and other energy storage areas. .
电池储能系统的最大容量可达MW级，随着电池储能系统规模化、国产化，其成本较以往大幅度降低，在电网中亦呈现出良好的应用前景。MW级储能系统在电网中的应用主要包括如下几方面：作为应急备用电源、提高用户供电可靠性和电能质量、削峰填谷、平抑新能源发电的出力波动。The maximum capacity of the battery energy storage system can reach the MW level. With the scale and localization of the battery energy storage system, its cost is greatly reduced compared with the past, and it also shows a good application prospect in the power grid. The application of MW-level energy storage system in the power grid mainly includes the following aspects: as an emergency backup power supply, improving user power supply reliability and power quality, peak shaving and valley filling, and smoothing output fluctuations of new energy power generation.
根据电网设计规定，10kV电压等级用户变配电站的变压器装接容量在250～6300kVA之间，重要用户一般情况下由两路及以上独立回路供电，每回线路各供一半负荷，约150kW～3MW，而从110(35)kV变配电站直接出线的用户一般负荷较大，因此储能容量一般应在MW级，具体需求容量按重要用户负荷大小而定。According to the design regulations of the power grid, the transformer installation capacity of 10kV voltage level user substations is between 250kVA and 6300kVA. Generally, important users are powered by two or more independent circuits, and each circuit supplies half of the load, about 150kW～ 3MW, and the users who directly go out from the 110 (35) kV substation generally have a large load, so the energy storage capacity should generally be at the MW level, and the specific required capacity depends on the load of important users.
根据运行策略及电池容量选择的不同，电池储能系统接入变、配电站可采用多种接入系统的方式。下面，将电池储能系统用作变配电站应急电源或用于变配电站负荷的削峰填谷时，接入110(35)kV变配电站低压侧母线的出线柜为例，来详细说明本发明的第一种接入方案。According to different operation strategies and battery capacity selection, the battery energy storage system can be connected to the substation and distribution station in a variety of ways to connect to the system. Below, when the battery energy storage system is used as an emergency power supply for a substation or for load shifting and valley filling in a substation, the outlet cabinet connected to the low-voltage side bus of a 110 (35) kV substation is taken as an example. The first access solution of the present invention will be described in detail.
图1所示为110(35)kV变配电站低压母线主接线示意图。如图1所示，某现有电网110kV变配电站1对应不同的主变容量：40MVA、50MVA、80MVA，所述变配电站配有2～3台降压变压器2，并通过降压变压器向变配电站的低压侧供电。假定每台所述降压变压器2的低压侧母线分别有12、14、16回出线，则通常的，每回出线经出线开关柜3引出送至负荷侧(用户)。Figure 1 shows a schematic diagram of the main wiring of the low-voltage bus in a 110 (35) kV substation. As shown in Figure 1, a 110kV substation 1 of an existing power grid corresponds to different main transformer capacities: 40MVA, 50MVA, and 80MVA. The substation is equipped with 2 to 3 step-down transformers 2, and through The transformer supplies power to the low voltage side of the substation. Assuming that the low-voltage side bus bars of each step-down transformer 2 have 12, 14, and 16 outgoing lines respectively, then usually, each outgoing line is sent to the load side (user) through the outgoing line switch cabinet 3.
图2为电池储能系统的电气接线图。如图2所示，本发明的所述电池储能系统4，包括：一用于输出直流电信号的蓄电池组42、一用于将直流电转换为三相交流电的DC/AC变流器(置于一PCS装置41内，PCS装置，powerconversion system，是储能电池和电网系统之间连接的主要设备)及一用于升压的升压变压器43，所述蓄电池组42经所述DC/AC变流器接入所述升压变压器43的低压侧(即由蓄电池输出的直流电信号经过变流器转换为合格的三相交流电信号，就可以接入变压器低压侧了)，并且通过所述升压变压器43接入所述变配电站1的10kV一段电网。Figure 2 is the electrical wiring diagram of the battery energy storage system. As shown in Figure 2, the battery energy storage system 4 of the present invention includes: a storage battery pack 42 for outputting direct current signals, a DC/AC converter for converting direct current into three-phase alternating current (placed In a PCS device 41, the PCS device (power conversion system, which is the main equipment connected between the energy storage battery and the grid system) and a step-up transformer 43 for boosting the voltage, the battery pack 42 is converted through the DC/AC transformer The converter is connected to the low-voltage side of the step-up transformer 43 (that is, the DC signal output by the battery is converted into a qualified three-phase AC signal through the converter, and then it can be connected to the low-voltage side of the transformer), and through the step-up The voltage transformer 43 is connected to the 10kV section of the power grid of the substation 1.
其中，PCS装置的主要任务是进行交直流电源的可控转换。PCS装置只需选择容量购买采用现有技术中已公知的市售的蓄电池和与其配套的PCS装置设备即可。Among them, the main task of the PCS device is to perform controllable conversion of AC and DC power. The PCS device only needs to select the capacity to purchase a commercially available storage battery known in the prior art and its matching PCS device equipment.
如图6和图7所示，常见的PCS装置的构成系统包括：DC/AC(直流/交流)双向变流系统、电池充放电接口、滤波环节等。根据PCS系统复杂程度的不同，还可以加入其它的反馈、控制环节。“蓄电池组”通常由许多电池串并联组成，PCS装置中的DC/AC变流器411，例如三相PWM逆变器，是由许多电力电子元器件(如晶闸管等)串并联组成，PCS装置中的“滤波器412(也称LC滤波器)”由许多电感(L)和电容(C)联接而成。安装时按照三相的顺序接入三相变压器的低压侧即可。As shown in Figure 6 and Figure 7, the common PCS device system includes: DC/AC (direct current/alternating current) bidirectional current conversion system, battery charging and discharging interface, filter link and so on. Depending on the complexity of the PCS system, other feedback and control links can also be added. The "battery pack" is usually composed of many batteries connected in series and parallel. The DC/AC converter 411 in the PCS device, such as a three-phase PWM inverter, is composed of many power electronic components (such as thyristors, etc.) connected in series and parallel. The PCS device The "filter 412 (also called LC filter)" in is formed by connecting many inductors (L) and capacitors (C). When installing, connect to the low-voltage side of the three-phase transformer in the order of three phases.
作为一种优选方案，本发明的电池储能系统为钠硫电池储能系统，用于输出/输出的400V交流电。如图3所示，电池储能系统可通过独立的用于升压的10/0.4kV变压器t1升压后接入变配电站的10kV一段电网。As a preferred solution, the battery energy storage system of the present invention is a sodium-sulfur battery energy storage system, which is used for outputting/exporting 400V alternating current. As shown in Figure 3, the battery energy storage system can be boosted by an independent 10/0.4kV transformer t1 for boosting and then connected to the 10kV section of the power grid of the substation.
总体而言，本发明的储能电池系统可以用于三种工作阶段：充电阶段、放电阶段、备用阶段，进而实现各阶段的储能与供电功能。Generally speaking, the energy storage battery system of the present invention can be used in three working stages: charging stage, discharging stage, and standby stage, and then realize the functions of energy storage and power supply in each stage.
①充电阶段：PCS装置在此期间工作在整流状态，电网向电池储能系统的蓄电池组提供能量；① Charging stage: the PCS device works in the rectification state during this period, and the grid provides energy to the battery pack of the battery energy storage system;
②放电阶段：PCS装置控制电池放电，电池储能系统向电网提供储存的电能；②Discharging stage: PCS device controls the battery discharge, and the battery energy storage system provides stored electric energy to the grid;
③备用阶段：包括两个部分，其一是充电结束到下一个放电阶段开始之间的一段时间，其二放电过程结束到下一个充电阶段开始之前的一段时间。处于备用阶段时，PCS装置将变流器各控制脉冲信号封锁，电池储能系统不参与和外界的能量交换。③Standby stage: It includes two parts, one is the period between the end of charging and the beginning of the next discharge stage, and the other is the period from the end of the discharge process to the beginning of the next charging stage. In the standby stage, the PCS device blocks the control pulse signals of the converter, and the battery energy storage system does not participate in the energy exchange with the outside world.
通过本实施例的接入方案，储能系统可以用作变配电站应急电源也可以用于变配电站负荷的削峰填谷。具体为：Through the connection scheme of this embodiment, the energy storage system can be used as an emergency power supply for a substation and for substation load shifting and valley filling. Specifically:
①用于应急电源：如图3所示，当开关柜A1断开，10kV一段母线上的出线开关柜a2～出线开关柜an(n是出线开关柜数目)对应的负荷无法继续从配电网取得电能。因此，PCS装置控制电池储能系统放电，储能系统的电能经变压器t1、出线开关柜a1，可将电能送至10kV一段母线，进而向一段母线上的其余出线开关柜a2～出线开关柜an(n是开关柜数目)所供应的全部或部分用户提供电能。①For emergency power supply: as shown in Figure 3, when the switchgear A1 is disconnected, the load corresponding to the outgoing switchgear a2~an (n is the number of outgoing switchgears) on the 10kV bus section cannot continue to be transferred from the distribution network Get electricity. Therefore, the PCS device controls the discharge of the battery energy storage system, and the electric energy of the energy storage system can be sent to the 10kV section of the busbar through the transformer t1 and the outgoing line switchgear a1, and then to the remaining outgoing line switchgear a2~an outgoing line switchgear an on the section of busbar (n is the number of switch cabinets) all or part of the user-provided electric energy supplied.
②用于削峰填谷。PCS装置控制电池储能系统在夜晚用电低谷时对电池充电储存电能，在白天用电高峰时将电能释放，充电阶段→备用阶段→放电阶段3个阶段循环运行，以平抑变压器T1负荷的峰谷差。②It is used to cut peaks and fill valleys. The PCS device controls the battery energy storage system to charge and store the battery when the power consumption is low at night, and release the power during the peak power consumption during the day, and the three stages of charging stage→backup stage→discharging stage are cycled to stabilize the peak load of the transformer T1. Valley difference.
采用本方案，不仅接线简单，而且当储能系统容量不大时，适用于应急电源运行模式。另外，若储能容量足够大，还能满足整段母线负荷紧急供电要求，可采用应急电源、削峰填谷或两者相结合的运行模式。With this scheme, not only the wiring is simple, but also it is suitable for emergency power supply operation mode when the capacity of the energy storage system is not large. In addition, if the energy storage capacity is large enough to meet the emergency power supply requirements of the entire busbar load, emergency power supply, peak shaving and valley filling, or a combination of the two can be used.
配电装置方面，除需为储能系统配置必要的升压装置外，还需增加一台10kV出线开关柜。这样可适用于多种运行模式，增加配电装置较少，减少了电网投资，且应急供电灵活。In terms of power distribution devices, in addition to the necessary booster devices for the energy storage system, a 10kV outlet switchgear needs to be added. In this way, it can be applied to multiple operation modes, less power distribution devices are added, the investment in the power grid is reduced, and the emergency power supply is flexible.
实施例2Example 2
本实施例为电池储能系统接在重要用户出线上，用作某条出线应急电源或用于变配电站负荷的削峰填谷时的第二种接入变配电站的方案。In this embodiment, the battery energy storage system is connected to an important user's outgoing line, and is used as an emergency power supply for a certain outgoing line or used for peak load shifting and valley filling of the substation and distribution station.
如图4所示，电池储能系统可以输入/输出400V交流电，通过独立的10/0.4kV变压器t1升压后经一台10kV引线柜s1接入10kV出线开关柜a1的出线电缆上。As shown in Figure 4, the battery energy storage system can input/output 400V AC, boosted by an independent 10/0.4kV transformer t1, and connected to the outgoing cable of the 10kV outgoing switch cabinet a1 through a 10kV lead cabinet s1.
采用本实施例的接入方案，储能可以用作某条用户出线应急电源也可以用于变配电站负荷的削峰填谷。具体为：With the access scheme of this embodiment, the energy storage can be used as an emergency power supply for a certain user outgoing line, and can also be used for peak-shaving and valley-filling of substation loads. Specifically:
①用于应急电源：当出线开关柜a1断开，该开关柜出线对应的用户无法继续取得电能。PCS控制电池储能系统放电,储能系统的电能经变压器t1、10kV引线柜s1向用户出线提供电能。①Used for emergency power supply: When the outgoing switch cabinet a1 is disconnected, the user corresponding to the outgoing line of the switch cabinet cannot continue to obtain electric energy. The PCS controls the discharge of the battery energy storage system, and the electric energy of the energy storage system provides electric energy to the user through the transformer t1 and the 10kV lead cabinet s1.
②用于削峰填谷。PCS控制电池储能系统在夜晚用电低谷时对电池充电储存电能，在白天用电高峰时将电能释放，充电阶段→备用阶段→放电阶段3个阶段循环运行，以平抑变压器T1负荷的峰谷差。②It is used to cut peaks and fill valleys. The PCS controls the battery energy storage system to charge and store the electric energy of the battery during the low power consumption at night, and release the electric energy during the peak power consumption during the day. The three phases of charging stage→backup stage→discharging stage are cycled to smooth the peak and valley load of transformer T1. Difference.
本实施例的接线方式仅能对一条出线提供紧急供电，适用于储能系统容量不大，但可满足一条重要用户出线负荷，采用应急电源、削峰填谷或两者相结合的运行模式，确保该重要用户不间断供电，同时实现变配电站削峰填谷。The wiring method of this embodiment can only provide emergency power supply to one outgoing line, which is suitable for the energy storage system with a small capacity, but can meet the load of an important user outgoing line, and adopt the operation mode of emergency power supply, peak shaving and valley filling, or a combination of the two. Ensure the uninterrupted power supply of this important user, and at the same time realize the peak shaving and valley filling of the substation and distribution station.
本实施例的接入方式的优点是储能系统容量要求低，增加配电装置较少，投资少，运行策略简单。The advantages of the access method in this embodiment are low energy storage system capacity requirements, fewer power distribution devices, less investment, and simple operation strategies.
本实施例的其它部分与实施例1相同。Other parts of this embodiment are the same as Embodiment 1.
实施例3Example 3
本实施例为采用在变配电站新增一条应急母线，将电池储能系统接在低压侧应急母线上，用作若干条出线应急电源或用于变配电站负荷的削峰填谷时的第三种接入变配电站的方案。具体如下：This embodiment is to add an emergency busbar in the substation and distribution station, connect the battery energy storage system to the emergency busbar on the low-voltage side, and use it as an emergency power supply for several outgoing lines or for peak-shaving and valley-filling of the load in the substation and distribution station. The third scheme for connecting to substations. details as follows:
如图5所示，电池储能系统可以输入/输出400V交流电，通过独立的10/0.4kV变压器t1升压后经一台10kV出线开关柜S1接入变配电站内增加的应急母线(10kV一段母线经出线开关柜a1的出线电缆la1、10kV二段母线经出线开关柜b1的出线电缆lb1也分别经开关柜Sa1、开关柜Sb1支接在应急母线上)。As shown in Figure 5, the battery energy storage system can input/output 400V AC, boosted by an independent 10/0.4kV transformer t1, and connected to the added emergency bus in the substation through a 10kV outlet switchgear S1 (10kV section 1 The outgoing cable la1 of the busbar through the outgoing switchgear a1, and the outgoing cable lb1 of the 10kV second-section busbar through the outgoing switchgear b1 are also connected to the emergency busbar through the switchgear Sa1 and switchgear Sb1 respectively).
本实施例的其它部分与实施例1相同。Other parts of this embodiment are the same as Embodiment 1.
本实施例的接入方案，储能系统可以用作若干条出线(此处以两条出线la1、lb1为例)的应急电源也可以用于变配电站负荷的削峰填谷。具体而言，即：In the connection scheme of this embodiment, the energy storage system can be used as an emergency power supply for several outgoing lines (here two outgoing lines la1 and lb1 are taken as an example) and can also be used for peak-shaving and valley-filling of substation loads. Specifically, namely:
①用作应急电源：如图5所示，当开关柜A1、开关柜B1断开，各开关柜出线对应的用户无法继续取得电能。PCS控制电池储能系统放电，储能系统的电能经变压器t1、10kV出线开关柜S1向应急母线供电，应急母线汇集的电能向开关柜Sa1和开关柜Sb1所分别对应支接的出线电缆la1、出线电缆lb1所连的负荷供电。①Used as an emergency power supply: As shown in Figure 5, when switchgear A1 and switchgear B1 are disconnected, the users corresponding to the outgoing lines of each switchgear cannot continue to obtain electric energy. The PCS controls the discharge of the battery energy storage system, and the electric energy of the energy storage system supplies power to the emergency busbar through the transformer t1 and the 10kV outgoing switchgear S1, and the electric energy collected by the emergency busbar is supplied to the outgoing cables la1, la1, and The load connected to the outgoing cable lb1 supplies power.
②用作削峰填谷。PCS控制电池储能系统在夜晚用电低谷时对电池充电储存电能，在白天用电高峰时将电能释放，充电阶段→备用阶段→放电阶段3个阶段循环运行，以平抑变配电站负荷的峰谷差。② It is used to cut peaks and fill valleys. The PCS controls the battery energy storage system to charge and store the electric energy in the battery when the power consumption is low at night, and release the electric energy during the peak power consumption in the daytime. The charging stage → backup stage → discharge stage is cycled in three stages to stabilize the load of the substation and distribution station. The peaks and valleys are poor.
本实施例的接线方式可选择对两条及以上出线中的其中一条或多条线路应急供电，适应性较强，但需增加较多设备。采用应急电源、削峰填谷或两者相结合的运行模式，确保该接入应急母线的重要用户不间断供电，同时实现变配电站削峰填谷。本实施例的优点是对各种运行模式的适应性强，运行策略灵活，能够充分发挥储能系统的优势。The wiring method of this embodiment can choose to provide emergency power supply to one or more of the two or more outgoing lines, which has strong adaptability, but requires more equipment. Adopt the operation mode of emergency power supply, peak shaving and valley filling or a combination of the two to ensure uninterrupted power supply for important users connected to the emergency bus, and at the same time realize peak shaving and valley filling of substations and distribution stations. The advantages of this embodiment are strong adaptability to various operating modes, flexible operating strategies, and the ability to give full play to the advantages of the energy storage system.
效果实施例4Effect Example 4
根据本发明提出的储能接入系统方案，以110kV某变配电站初步设计为基础，完成了储能系统接入110kV变配电站的方案充放设计。在原负荷曲线的基础上，仿真储能系统充放电对负荷曲线的削峰填谷效果，得到图8所示的效果仿真图。According to the energy storage access system scheme proposed by the present invention, based on the preliminary design of a 110kV substation, the charge and discharge design of the energy storage system access to the 110kV substation is completed. On the basis of the original load curve, the peak-shaving and valley-filling effect of the energy storage system charging and discharging on the load curve is simulated, and the effect simulation diagram shown in Figure 8 is obtained.
如图8所示，当固定在一个用电低谷时段，电网对储能系统充电；当固定在一个时段或多个用电高峰时段，储能系统以额定功率输出，可补偿高峰负荷。As shown in Figure 8, when it is fixed at a low power consumption period, the grid charges the energy storage system; when it is fixed at one period or multiple peak periods of power consumption, the energy storage system outputs at rated power to compensate for peak loads.
因此，采用本发明，能起到为变配电站重要用户提供应急电源、就地削峰填谷平滑变配电站负荷的作用，为提高供电可靠性及电网可持续发展提供了有力保障。Therefore, the adoption of the present invention can provide emergency power supply for important users of substations and distribution stations, cut peaks and fill valleys on the spot to smooth the load of substations and distribution stations, and provide a strong guarantee for improving power supply reliability and sustainable development of power grids.
以上详细描述了本发明的各较佳具体实施例。应当理解，本领域的普通技术人员无需创造性劳动就可以根据本发明的构思作出诸多修改和变化。因此，凡本技术领域中技术人员依本发明的构思在现有技术的基础上通过逻辑分析、推理或者有限的实验可以得到的技术方案，皆应在由权利要求书所确定的保护范围内。Various preferred specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall be within the scope of protection defined by the claims.
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| CN201510141642.8ACN104821594A (en) | 2015-03-27 | 2015-03-27 | Transformation and distribution station connected with energy storage system |
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