CN110198041A - A kind of voltage dip governing system and its control method based on distributed energy storage - Google Patents
A kind of voltage dip governing system and its control method based on distributed energy storage Download PDFInfo
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- H—ELECTRICITY
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Abstract
本发明涉及一种基于分布式储能的电压暂降治理系统及其控制方法，系统包括：电网连接端、第一隔离开关、晶闸管、第二隔离开关和负载连接端依次串联；电网连接端和第一隔离开关间的连接点与晶闸管和第二隔离开关间的连接点之间连接有旁路开关；晶闸管和第二隔离开关间的连接点与耦合变压器、双向变流器和储能装置依次连接；电压暂降治理系统通过电网连接端和负载连接端连接于电网与负载间的主电路上；双向变流器控制器，用于根据电网运行状态控制双向变流器，使储能装置改变运行状态，本发明提供的方案，实现储能系统与市电的无缝切换，从而提高敏感负荷用户的电能质量。
The invention relates to a voltage sag management system based on distributed energy storage and its control method. The system includes: a power grid connection terminal, a first isolating switch, a thyristor, a second isolating switch, and a load connection terminal in series; A bypass switch is connected between the connection point between the first isolation switch and the connection point between the thyristor and the second isolation switch; the connection point between the thyristor and the second isolation switch is connected to the coupling transformer, the bidirectional converter and the energy storage device in sequence Connection; the voltage sag control system is connected to the main circuit between the grid and the load through the grid connection terminal and the load connection terminal; the bidirectional converter controller is used to control the bidirectional converter according to the operating status of the grid, so that the energy storage device changes In the running state, the solution provided by the present invention realizes the seamless switching between the energy storage system and the mains, thereby improving the power quality of sensitive load users.
Description
技术领域technical field
本发明涉及电能质量领域，具体涉及一种基于分布式储能的电压暂降治理系统及其控制方法。The invention relates to the field of power quality, in particular to a distributed energy storage-based voltage sag control system and a control method thereof.
背景技术Background technique
用电设备的技术更新给供电质量提出了更高的要求，电压暂降是发生频率最高、影响最为严重的电能质量问题之一。尤其是短时电压暂降可导致逻辑可编程控制器、精密机械工具、半导体生产线等敏感负荷非正常工作甚至设备损毁，给企业带来巨大经济损失。我国从2014年5月10日开始实施国家标准GB/T 30137-2013《电能质量电压暂降与暂时中断》，该标准给出了电压暂降相关定义、推荐指标及监测要求等。根据该标准电压暂降被定义为电压有效值快速下降到参考电压的90％～10％，并在短暂持续10ms～1min后恢复正常的现象。产生电压暂降的原因有很多，雷击、感应电机的启动、短路故障是引起电压暂降的主要原因。雷击会导致保护装置动作，从而引起电压暂降，雷击导致的暂降影响范围大，持续时间一般超过100ms；感应电机全电压启动需从电源汲取大电流，从而引起电压暂降，由此引起的电压暂降持续时间长，暂降程度小，可以通过适当措施消除不利影响。短路故障产生原因多，危害大，并且可能导致相邻支路产生电压暂降。电压暂降无法避免且不可预测，因此电压暂降治理治理设备成为电能质量领域的研究热点。The technical update of electrical equipment puts forward higher requirements for power supply quality, and voltage sag is one of the most frequently occurring and most serious power quality problems. In particular, short-term voltage sags can cause sensitive loads such as logic programmable controllers, precision mechanical tools, and semiconductor production lines to work abnormally or even damage equipment, causing huge economic losses to enterprises. my country began to implement the national standard GB/T 30137-2013 "Power Quality Voltage Dips and Temporary Interruptions" on May 10, 2014. This standard provides definitions, recommended indicators and monitoring requirements for voltage sags. According to this standard, voltage sag is defined as a phenomenon in which the effective value of voltage drops rapidly to 90% to 10% of the reference voltage, and returns to normal after a brief duration of 10ms to 1min. There are many reasons for voltage sag, and lightning strikes, induction motor start-up, and short-circuit faults are the main causes of voltage sag. Lightning strikes will cause the protective device to operate, thereby causing voltage sags. The sags caused by lightning strikes have a wide range of influence, and the duration generally exceeds 100ms; the induction motor needs to draw a large current from the power supply when starting at full voltage, which causes voltage sags. The voltage sag lasts for a long time and the sag is small, and the adverse effects can be eliminated by appropriate measures. There are many reasons for short-circuit faults, great harm, and may cause voltage sags in adjacent branches. Voltage sag is unavoidable and unpredictable, so voltage sag control equipment has become a research hotspot in the field of power quality.
发明内容Contents of the invention
针对现有技术的不足，本发明的目的是实现储能系统与市电的无缝切换，从而提高敏感负荷用户的电能质量。并且，随着储能技术的发展与储能成本的降低，基于储能技术的电压暂降治理设备将会有更好的治理能力与更好的经济性。Aiming at the deficiencies of the prior art, the purpose of the present invention is to realize the seamless switching between the energy storage system and the mains, thereby improving the power quality of users with sensitive loads. Moreover, with the development of energy storage technology and the reduction of energy storage costs, voltage sag control equipment based on energy storage technology will have better governance capabilities and better economy.
本发明的目的是采用下述技术方案实现的：The object of the present invention is to adopt following technical scheme to realize:
一种基于分布式储能的电压暂降治理系统，其改进之处在于，所述系统包括：电网连接端、负载连接端、旁路开关、第一隔离开关、第二隔离开关、晶闸管、耦合变压器、双向变流器、双向变流器控制器和储能装置；A voltage sag control system based on distributed energy storage, the improvement of which is that the system includes: a grid connection terminal, a load connection terminal, a bypass switch, a first isolation switch, a second isolation switch, a thyristor, a coupling Transformers, bidirectional converters, bidirectional converter controllers and energy storage devices;
所述电网连接端、第一隔离开关、晶闸管、第二隔离开关和负载连接端依次串联；The grid connection terminal, the first isolating switch, the thyristor, the second isolating switch and the load connecting terminal are connected in series in sequence;
所述电网连接端和第一隔离开关间的连接点与晶闸管和第二隔离开关间的连接点之间连接有所述旁路开关；The bypass switch is connected between the connection point between the grid connection terminal and the first isolating switch and the connection point between the thyristor and the second isolating switch;
所述晶闸管和第二隔离开关间的连接点与所述耦合变压器、双向变流器和储能装置依次连接；The connection point between the thyristor and the second isolating switch is sequentially connected to the coupling transformer, the bidirectional converter and the energy storage device;
所述控制器，用于根据电网运行状态控制所述双向变流器，使储能装置改变运行状态；The controller is configured to control the bidirectional converter according to the operating state of the power grid, so as to change the operating state of the energy storage device;
所述电压暂降治理系统通过所述电网连接端和负载连接端连接于电网与负载间的主电路上。The voltage sag control system is connected to the main circuit between the grid and the load through the grid connection terminal and the load connection terminal.
优选的，所述双向变流器为双向AC/DC变流器。Preferably, the bidirectional converter is a bidirectional AC/DC converter.
优选的，preferred,
监控单元，用于监控电网的运行状态；所述运行状态至少包括如下的任一种：电网对负载正常供电、电网发生电压暂降、电网恢复正常；The monitoring unit is used to monitor the operation state of the power grid; the operation state includes at least any of the following: the power grid supplies power to the load normally, the power grid has a voltage sag, and the power grid returns to normal;
当电网对负载正常供电时，闭合所述第一隔离开关和第二隔离开关，断开所述旁路开关；When the grid supplies power to the load normally, close the first isolating switch and the second isolating switch, and open the bypass switch;
当电网发生电压暂降时，断开所述第一隔离开关，闭合所述第二隔离开关，断开所述旁路开关；When a voltage sag occurs in the power grid, open the first isolating switch, close the second isolating switch, and open the bypass switch;
当电网恢复正常后，闭合所述第一隔离开关和第二隔离开关，断开所述旁路开关。After the power grid returns to normal, close the first isolation switch and the second isolation switch, and open the bypass switch.
进一步的，所述双向变流器控制器包括：Further, the bidirectional converter controller includes:
充电单元，用于当电网对负载正常供电时，利用并网双闭环控制策略控制所述双向变流器，将电网与负载间的主电路上的三相交流电转换成直流电对所述储能装置进行充电；The charging unit is used to control the bidirectional converter by using the grid-connected double closed-loop control strategy to convert the three-phase alternating current on the main circuit between the grid and the load into direct current for the energy storage device when the grid supplies power to the load normally. to charge;
供电单元，用于当电网发生电压暂降时，利用离网双闭环控制策略控制所述双向变流器，使储能装置向负载供电；A power supply unit, configured to control the bidirectional converter by using an off-grid double closed-loop control strategy when a voltage sag occurs in the power grid, so that the energy storage device supplies power to the load;
柔性退出单元，用于当电网恢复正常后，利用同期并网控制策略控制所述双向变流器，储能柔性退出，供电电源由储能装置转向电网。The flexible exit unit is used to control the bidirectional converter by using the synchronous grid-connected control strategy when the power grid returns to normal, so that the energy storage is softly withdrawn, and the power supply is transferred from the energy storage device to the power grid.
一种基于分布式储能的电压暂降治理系统的控制方法，其改进之处在于，所述方法包括：A control method for a voltage sag management system based on distributed energy storage, the improvement of which is that the method includes:
当电网发生电压暂降时，切除电网对负载的供电，并利用控制双向变流器使所述储能装置对负载供电；When a voltage sag occurs in the power grid, cut off the power supply from the power grid to the load, and use the control bidirectional converter to make the energy storage device supply power to the load;
当电网恢复正常后，控制双向变流器使所述储能装置柔性退出对负载的供电。When the power grid returns to normal, the bidirectional converter is controlled to make the energy storage device softly withdraw from power supply to the load.
优选的，当电网对负载正常供电时，控制双向变流器使电网对所述储能装置进行充电。Preferably, when the grid supplies power to the load normally, the bidirectional converter is controlled to enable the grid to charge the energy storage device.
进一步的，所述当电网对负载正常供电时，控制双向变流器使电网对所述储能装置进行充电，包括：Further, when the grid supplies power to the load normally, controlling the bidirectional converter to enable the grid to charge the energy storage device includes:
闭合所述第一隔离开关和第二隔离开关；closing the first isolation switch and the second isolation switch;
断开所述旁路开关；disconnecting the bypass switch;
利用并网双闭环控制策略控制所述双向变流器，将电网与负载间的主电路上的三相交流电转换成直流电对所述储能装置进行充电。The two-way converter is controlled by a grid-connected double closed-loop control strategy, and the three-phase alternating current on the main circuit between the grid and the load is converted into direct current to charge the energy storage device.
优选的，所述切除电网对负载的供电，并利用控制双向变流器使所述储能装置对负载供电，包括：Preferably, the cutting off the power supply from the grid to the load, and controlling the bidirectional converter to enable the energy storage device to supply power to the load includes:
断开所述第一隔离开关，闭合所述第二隔离开关；Opening the first isolating switch and closing the second isolating switch;
断开所述旁路开关；disconnecting the bypass switch;
利用离网双闭环控制策略控制所述双向变流器，使储能装置向负载供电。An off-grid double closed-loop control strategy is used to control the bidirectional converter so that the energy storage device supplies power to the load.
优选的，所述控制双向变流器使所述储能装置柔性退出对负载的供电，包括：Preferably, the controlling the bidirectional converter to make the energy storage device softly withdraw from the power supply to the load includes:
闭合所述第一隔离开关和第二隔离开关；closing the first isolation switch and the second isolation switch;
断开所述旁路开关；disconnecting the bypass switch;
利用同期并网控制策略控制所述双向变流器，储能柔性退出，供电电源由储能装置转向电网。The bidirectional converter is controlled by using a synchronous grid-connected control strategy, the energy storage is withdrawn flexibly, and the power supply is transferred from the energy storage device to the grid.
优选的，当所述晶闸管、耦合变压器、双向变流器和储能装置故障时，闭合所述旁路开关对所述晶闸管、耦合变压器、双向变流器和储能装置进行检修。Preferably, when the thyristor, the coupling transformer, the bidirectional converter and the energy storage device fail, the bypass switch is closed to perform maintenance on the thyristor, the coupling transformer, the bidirectional converter and the energy storage device.
与最接近的现有技术相比，本发明具有的有益效果：Compared with the closest prior art, the present invention has the beneficial effects:
本发明提供的技术方案适用于各种类型的电压暂降，传统方法对于单相电压暂降、两相电压暂降、三相不平衡电压暂降和三相平衡电压暂降没有通用的控制方法及策略。本发明所提出的控制策略具有更好的通用性能。晶闸管和耦合变压器应用于中压等级，而储能装置和双向变流器处于低压状态，从而简化运行维护。结合广泛的现代储能技术可以提供从几秒到几小时的自动控制，有效提高配电网的供电品质，实现储能系统的多功能协调控制。The technical solution provided by the present invention is applicable to various types of voltage sags, and the traditional method has no general control method for single-phase voltage sags, two-phase voltage sags, three-phase unbalanced voltage sags and three-phase balanced voltage sags and strategy. The control strategy proposed by the present invention has better general performance. Thyristors and coupling transformers are used at medium voltage levels, while energy storage devices and bidirectional converters are at low voltage, thus simplifying operation and maintenance. Combined with a wide range of modern energy storage technologies, it can provide automatic control from seconds to hours, effectively improve the power supply quality of the distribution network, and realize multi-functional coordinated control of the energy storage system.
附图说明Description of drawings
图1是本发明提供的一种基于分布式储能的电压暂降治理系统结构示意图；Figure 1 is a schematic structural diagram of a voltage sag management system based on distributed energy storage provided by the present invention;
图2是本发明实施例中并网双闭环控制策略的控制框图；Fig. 2 is a control block diagram of a grid-connected double closed-loop control strategy in an embodiment of the present invention;
图3是本发明实施例中离网双闭环控制策略的控制框图；3 is a control block diagram of an off-grid double closed-loop control strategy in an embodiment of the present invention;
图4是本发明实施例中同期并网策略的控制框图。Fig. 4 is a control block diagram of the synchronous grid connection strategy in the embodiment of the present invention.
具体实施方式Detailed ways
下面结合附图对本发明的具体实施方式作进一步的详细说明。The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
本发明提供了一种基于分布式储能的电压暂降治理系统，旨在实现储能系统与市电的无缝切换，从而提高敏感负荷用户的电能质量。并且，随着储能技术的发展与储能成本的降低，基于储能技术的电压暂降治理设备将会有更好的治理能力与更好的经济性，如图1所示，包括：The invention provides a voltage sag management system based on distributed energy storage, aiming at realizing the seamless switching between the energy storage system and the mains, thereby improving the power quality of sensitive load users. Moreover, with the development of energy storage technology and the reduction of energy storage costs, voltage sag control equipment based on energy storage technology will have better governance capabilities and better economy, as shown in Figure 1, including:
电网连接端、负载连接端、旁路开关、第一隔离开关、第二隔离开关、晶闸管(可控硅整流器)、耦合变压器、双向变流器、双向变流器控制器和储能装置；Grid connection terminal, load connection terminal, bypass switch, first isolating switch, second isolating switch, thyristor (silicon controlled rectifier), coupling transformer, bidirectional converter, bidirectional converter controller and energy storage device;
所述电网连接端、第一隔离开关、晶闸管、第二隔离开关和负载连接端依次串联；The grid connection terminal, the first isolating switch, the thyristor, the second isolating switch and the load connecting terminal are connected in series in sequence;
所述电网连接端和第一隔离开关间的连接点与晶闸管和第二隔离开关间的连接点之间连接有所述旁路开关；The bypass switch is connected between the connection point between the grid connection terminal and the first isolating switch and the connection point between the thyristor and the second isolating switch;
所述晶闸管和第二隔离开关间的连接点与所述耦合变压器、双向变流器和储能装置依次连接；The connection point between the thyristor and the second isolating switch is sequentially connected to the coupling transformer, the bidirectional converter and the energy storage device;
所述电压暂降治理系统通过所述电网连接端和负载连接端连接于电网与负载间的主电路上；The voltage sag management system is connected to the main circuit between the grid and the load through the grid connection terminal and the load connection terminal;
所述双向变流器控制器，用于根据电网运行状态控制所述双向变流器，使储能装置改变运行状态。The bidirectional converter controller is used to control the bidirectional converter according to the operating state of the power grid, so as to change the operating state of the energy storage device.
其中，所述双向变流器为双向AC/DC变流器。Wherein, the bidirectional converter is a bidirectional AC/DC converter.
当电网对负载正常供电时，闭合所述第一隔离开关和第二隔离开关，断开所述旁路开关；When the grid supplies power to the load normally, close the first isolating switch and the second isolating switch, and open the bypass switch;
当电网发生电压暂降时，断开所述第一隔离开关，闭合所述第二隔离开关，断开所述旁路开关；When a voltage sag occurs in the power grid, open the first isolating switch, close the second isolating switch, and open the bypass switch;
当电网恢复正常后，闭合所述第一隔离开关和第二隔离开关，断开所述旁路开关。After the power grid returns to normal, close the first isolation switch and the second isolation switch, and open the bypass switch.
所述双向变流器控制器包括：The bidirectional converter controller includes:
充电单元，用于当电网对负载正常供电时，利用并网双闭环控制策略控制所述双向变流器，将电网与负载间的主电路上的三相交流电转换成直流电对所述储能装置进行充电；The charging unit is used to control the bidirectional converter by using the grid-connected double closed-loop control strategy to convert the three-phase alternating current on the main circuit between the grid and the load into direct current for the energy storage device when the grid supplies power to the load normally. to charge;
供电单元，用于当电网发生电压暂降时，利用离网双闭环控制策略控制所述双向变流器，使储能装置向负载供电；A power supply unit, configured to control the bidirectional converter by using an off-grid double closed-loop control strategy when a voltage sag occurs in the power grid, so that the energy storage device supplies power to the load;
柔性退出单元，用于当电网恢复正常后，利用同期并网控制策略控制所述双向变流器，储能柔性退出，供电电源由储能装置转向电网。The flexible exit unit is used to control the bidirectional converter by using the synchronous grid-connected control strategy when the power grid returns to normal, so that the energy storage is softly withdrawn, and the power supply is transferred from the energy storage device to the power grid.
本发明中的基于分布式储能的电压暂降治理系统，主要目的是为欲保护负荷提供电压暂降保护，优质电能，与传统电压暂降治理装置相比，本发明提供的基于分布式储能的电压暂降治理系统使用超级电容作为储能元件，市电正常时，市电向储能元件充电；市电发生电压暂降时，晶闸管断开，双向变换器控制储能放电，为负荷提供电能支撑。The main purpose of the voltage sag control system based on distributed energy storage in the present invention is to provide voltage sag protection and high-quality electric energy for the load to be protected. Compared with the traditional voltage sag control device, the distributed energy storage based The energy-saving voltage sag control system uses supercapacitors as energy storage components. When the mains power is normal, the mains charges the energy storage components; Provide power support.
进一步的，本发明还提供了一种基于分布式储能的电压暂降治理系统的控制方法，所述方法包括：Further, the present invention also provides a control method of a voltage sag management system based on distributed energy storage, the method comprising:
当电网对负载正常供电时，控制双向变流器使电网对所述储能装置进行充电，即控制所述储能装置处于浮充状态；When the grid supplies power to the load normally, control the bidirectional converter to enable the grid to charge the energy storage device, that is, control the energy storage device to be in a floating charge state;
当电网发生电压暂降时，切除电网对负载的供电，并利用控制双向变流器使所述储能装置对负载供电，即控制储能装置处于供电状态；When a voltage sag occurs in the power grid, cut off the power supply from the power grid to the load, and use the control bidirectional converter to make the energy storage device supply power to the load, that is, control the energy storage device to be in the power supply state;
当电网恢复正常后，控制双向变流器使所述储能装置柔性退出对负载的供电，即控制储能装置处于柔性退出状态。When the power grid returns to normal, control the bidirectional converter to make the energy storage device softly withdraw from power supply to the load, that is, control the energy storage device to be in a soft exit state.
具体的，所述当电网对负载正常供电时，控制双向变流器使电网对所述储能装置进行充电，包括：Specifically, when the grid supplies power to the load normally, controlling the bidirectional converter to enable the grid to charge the energy storage device includes:
闭合所述第一隔离开关和第二隔离开关；closing the first isolation switch and the second isolation switch;
断开所述旁路开关；disconnecting the bypass switch;
利用并网双闭环控制策略控制所述双向变流器，将电网与负载间的主电路上的三相交流电转换成直流电对所述储能装置进行充电。The two-way converter is controlled by a grid-connected double closed-loop control strategy, and the three-phase alternating current on the main circuit between the grid and the load is converted into direct current to charge the energy storage device.
该过程中，双向变流器控制三相交流市电变换成直流向储能装置进行充电，以期达到小电流充电的目的，储能变流器常用的并网双闭环控制策略实现双向AC/DC变流器中IGBT的开关状态控制，使得电能由主电路流向储能装置，储能装置处于浮充状态，其控制框图如图2所示。首先，求超级电容的电压反馈信号Udc与给定电压值Udref间的差值，经过PI控制环节生成内环的给定电流信号Idref；求超级电容的无功功率反馈信号Q与给定无功值Qref间的差值，经过PI控制环节生成内环的给定电流信号Iqref；将已得Idref与Id、Iqref与Iq分别做差之后经过PI控制环节生成给定电压信号Udref与Uqref，对已得给定电压信号与实际电压信号和前馈控制信号运算之后得到电压控制信号Udl与Uql，生成PWM控制信号，控制IGBT的开关。In this process, the bidirectional converter controls the three-phase AC mains to convert it into DC to charge the energy storage device in order to achieve the purpose of charging with a small current. The grid-connected double closed-loop control strategy commonly used by the energy storage converter realizes bidirectional AC/DC The switching state of the IGBT in the converter is controlled so that the electric energy flows from the main circuit to the energy storage device, and the energy storage device is in a floating charge state. The control block diagram is shown in Figure 2. First, calculate the difference between the voltage feedback signal Udc of the super capacitor and the given voltage value Udref, and generate the given current signal Idref of the inner loop through the PI control link; find the reactive power feedback signal Q of the super capacitor and the given reactive power The difference between the values Qref, through the PI control link to generate the given current signal Iqref of the inner loop; after making the difference between the obtained Idref and Id, Iqref and Iq respectively, through the PI control link to generate the given voltage signal Udref and Uqref, for the already obtained The voltage control signals Udl and Uql are obtained after the given voltage signal, the actual voltage signal and the feedforward control signal are calculated, and the PWM control signal is generated to control the switch of the IGBT.
所述切除电网对负载的供电，并利用控制双向变流器使所述储能装置对负载供电，包括：The cutting off the power supply from the grid to the load, and using the control bidirectional converter to enable the energy storage device to supply power to the load includes:
断开所述第一隔离开关，闭合所述第二隔离开关；Opening the first isolating switch and closing the second isolating switch;
断开所述旁路开关；disconnecting the bypass switch;
利用离网双闭环控制策略控制所述双向变流器，使储能装置向负载供电。An off-grid double closed-loop control strategy is used to control the bidirectional converter so that the energy storage device supplies power to the load.
该过程中，市电发生电压暂降时，双向变流器采用离网双闭环控制策略控制储能装置电能由直流转换成三相交流向负载进行供电，以期达到电压暂降治理的目的，双向变流器控制框图如图3所示，图中Up-d、Ug-d、theta、E分别代表并网点电压d轴分量、电网电压d轴分量、电压矢量位置角、并网点电压幅值。取dq坐标系中的d轴与电网电动势重合，则电网电动势q轴分量Ug_q＝0。故储能装置只需要保证输出电压d轴分量与电网电动势d轴分量相同，电压矢量位置角相同即可。Up-d与Ug-d比较后经过PI调节器与并网电压幅值相加成为新的并网点电压幅值；电压矢量位置角与电网电压位置角theta相同。该控制方式的目的使得并网点电压与电网电压幅值相等、初相相同、频率相等。当发生电压暂降时，晶闸管由于通过电流为零关断，晶闸管门极信号由1变为0；，储能系统代替故障后的市电向负载供电，完成电压暂降的治理。In this process, when the mains voltage sags, the bidirectional converter adopts an off-grid double closed-loop control strategy to control the energy storage device to convert the electric energy from DC to three-phase AC to supply power to the load, in order to achieve the purpose of voltage sag control. The control block diagram of the converter is shown in Figure 3, where Up-d, Ug-d, theta, and E represent the d-axis component of the grid-connected point voltage, the d-axis component of the grid voltage, the position angle of the voltage vector, and the voltage amplitude of the grid-connected point, respectively. If the d-axis in the dq coordinate system coincides with the electromotive force of the grid, then the q-axis component of the electromotive force of the grid is Ug_q=0. Therefore, the energy storage device only needs to ensure that the d-axis component of the output voltage is the same as the d-axis component of the grid electromotive force, and the voltage vector position angle is the same. After Up-d is compared with Ug-d, the PI regulator is added to the grid-connected voltage amplitude to form a new grid-connected point voltage amplitude; the voltage vector position angle is the same as the grid voltage position angle theta. The purpose of this control method is to make the grid-connected point voltage equal to the grid voltage amplitude, initial phase, and frequency. When a voltage sag occurs, the thyristor turns off due to the zero passing current, and the gate signal of the thyristor changes from 1 to 0; the energy storage system replaces the mains power after the failure to supply power to the load, and completes the control of the voltage sag.
所述控制双向变流器使所述储能装置柔性退出对负载的供电，包括：The control of the bidirectional converter to make the energy storage device flexibly withdraw from the power supply to the load includes:
闭合所述第一隔离开关和第二隔离开关；closing the first isolation switch and the second isolation switch;
断开所述旁路开关；disconnecting the bypass switch;
利用同期并网控制策略控制所述双向变流器，储能柔性退出，供电电源由储能装置转向电网。The bidirectional converter is controlled by using a synchronous grid-connected control strategy, the energy storage is withdrawn flexibly, and the power supply is transferred from the energy storage device to the grid.
该过程中，电压暂降恢复后，双向变流器控制储能装置提供的电压逐渐降低，将供电方由储能装置逐渐转向市电，以期达到储能装置柔性退出的目的，双向变流器采用同期并网控制，其控制框图如图4所示，图中Up-d、Ug-d、Up-q、Ug-q、theta、E分别代表并网点电压d轴分量、并网点电压q轴分量、电网电压d轴分量、电网电压q轴分量、电压矢量位置角、并网点电压幅值。Up-d与Ug-d比较后经过PI调节器与并网电压幅值相加成为新的并网点电压幅值；Up-q与Ug-q比较后经过PI调节器与theta相加成为调节并网点电压的电压矢量角。该控制方式的目的在于使得并网点电压与电网电压幅值相等、初相相同、频率相等。当同期并网完成后，晶闸管导通，使得电网与储能系统并网运行，双向变流器控制并网点输出电流缓慢减小直到输出电流为零，储能系统改变至浮充工作状态。In this process, after the voltage sag is restored, the bidirectional converter controls the voltage provided by the energy storage device to gradually decrease, and the power supply is gradually shifted from the energy storage device to the mains, in order to achieve the purpose of soft withdrawal of the energy storage device. Synchronous grid-connected control is adopted, and its control block diagram is shown in Figure 4. In the figure, Up-d, Ug-d, Up-q, Ug-q, theta, and E respectively represent the d-axis component of the grid-connected point voltage and the q-axis of the grid-connected point voltage Component, grid voltage d-axis component, grid voltage q-axis component, voltage vector position angle, grid-connected point voltage amplitude. After Up-d is compared with Ug-d, it is added to the grid-connected voltage amplitude by the PI regulator to become the new grid-connected point voltage amplitude; after Up-q is compared with Ug-q, it is added to the PI regulator and theta to become the adjusted and The voltage vector angle of the dot voltage. The purpose of this control method is to make the grid-connected point voltage equal to the grid voltage amplitude, initial phase, and frequency. When the synchronous grid connection is completed, the thyristor is turned on, so that the grid and the energy storage system are connected to the grid. The bidirectional converter controls the output current of the grid connection point to decrease slowly until the output current is zero, and the energy storage system changes to the floating charging state.
需要说明的是，在实际应用过程中，可以利用所述旁路开关进行设备检修，当所述晶闸管、耦合变压器、双向变流器和储能装置故障时，闭合所述旁路开关对所述晶闸管、耦合变压器、双向变流器和储能装置进行检修。It should be noted that, in the actual application process, the bypass switch can be used for equipment maintenance. When the thyristor, coupling transformer, bidirectional converter and energy storage device fail, closing the bypass switch will affect the Thyristors, coupling transformers, bidirectional converters and energy storage devices are overhauled.
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.
最后应当说明的是：以上实施例仅用以说明本发明的技术方案而非对其限制，尽管参照上述实施例对本发明进行了详细的说明，所属领域的普通技术人员应当理解：依然可以对本发明的具体实施方式进行修改或者等同替换，而未脱离本发明精神和范围的任何修改或者等同替换，其均应涵盖在本发明的权利要求保护范围之内。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention shall fall within the protection scope of the claims of the present invention.
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| CN110994590A (en) * | 2019-11-14 | 2020-04-10 | 国家电网有限公司 | A voltage sag control system based on an optical storage system and its control method |
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| CN115589026B (en) * | 2022-11-02 | 2023-11-14 | 北京索英电气技术股份有限公司 | Power supply system and grid-connected/disconnected switching method of energy storage converter |
| CN117239776A (en) * | 2023-08-25 | 2023-12-15 | 国网湖北省电力有限公司电力科学研究院 | A method, device, system and medium for controlling voltage sag in target area |
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