CN105449650B - A kind of protection system and method for flexible direct current intelligence transmission and distribution network - Google Patents
A kind of protection system and method for flexible direct current intelligence transmission and distribution network Download PDFInfo
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Abstract
本发明实施例公开了一种柔性直流智能输配电网的保护系统和方法，对柔性直流智能输配电网分三个区域保护，包括：交流开关场区域、换流器区域和直流输电线路区域，其中：在交流开关场区域设置交流开关场保护装置；在换流器区域设置换流器保护装置；在直流输电线路区域设置直流输电线路保护装置。通过对线路的分区重叠配置保护，可以实现对柔性直流智能输配电网系统保护设置的无“盲区”，使得在故障或者其他异常情况下迅速切除系统中故障或不正常的运行设备，防止对系统造成损害或者感染其他部分的正常工作，从而保护柔性直流输配电系统中所有设备的安全稳定进行。
The embodiment of the present invention discloses a protection system and method for a flexible direct current intelligent transmission and distribution network. The flexible direct current intelligent transmission and distribution network is divided into three areas for protection, including: an AC switchyard area, a converter area, and a direct current transmission line area. Among them: the AC switchyard protection device is installed in the AC switchyard area; the converter protection device is installed in the converter area; the DC transmission line protection device is installed in the DC transmission line area. By overlapping and configuring protection for lines, it is possible to realize no "blind zone" for the protection setting of the flexible DC intelligent transmission and distribution network system, so that in the event of a fault or other abnormal conditions, faulty or abnormal operating equipment in the system can be quickly removed to prevent damage to the system Cause damage or infect the normal work of other parts, so as to protect the safety and stability of all equipment in the flexible DC transmission and distribution system.
Description
技术领域technical field
本发明涉及电力配电系统保护技术领域，特别是涉及一种柔性直流智能输配电网的保护系统和方法。The invention relates to the technical field of electric power distribution system protection, in particular to a protection system and method for a flexible DC intelligent transmission and distribution network.
背景技术Background technique
柔性直流智能输配电网技术是一种新型的直流输配电技术，即在直流输配电网应用中换流器采用IGBT(Insulated Gate Bipolar Transistor,绝缘栅双极型晶体管)阀和两电平(或多电平)三相机构，并使用脉宽调制技术控制IGBT阀的开断状况，从而使得由其构成的直流输配电网系统在许多方面克服常规的直流输配电中呈现的多类问题。Flexible DC intelligent transmission and distribution network technology is a new type of DC transmission and distribution technology, that is, in the application of DC transmission and distribution network, the converter uses IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) valve and two-level ( or multi-level) three-phase mechanism, and use pulse width modulation technology to control the on-off status of the IGBT valve, so that the DC transmission and distribution network system composed of it overcomes the various problems in conventional DC transmission and distribution in many aspects .
对于柔性直流智能输配电网技术在应用中呈现出了诸多优点，如系统稳定强；可实现非同步系统的互联；向无源区供电时，不存在换相失败问题；输送有功功率和无功功率可以快速独立控制；能较好地分期建设、扩展性好；事故后快速恢复供电和黑启动等。For the application of flexible DC intelligent transmission and distribution network technology, there are many advantages, such as strong system stability; the interconnection of asynchronous systems can be realized; there is no commutation failure problem when supplying power to passive areas; the transmission of active power and reactive power The power can be quickly and independently controlled; the construction can be better staged, and the scalability is good; the power supply can be restored quickly after an accident and black start, etc.
然而，柔性直流智能输配电网系统作为直流输电的一种新技术，对于其线路的保护措施依旧有待完善。However, as a new technology of DC transmission, the flexible DC intelligent transmission and distribution network system still needs to be improved for its line protection measures.
发明内容Contents of the invention
本发明实施例中提供了一种柔性直流智能输配电网的保护系统和方法，以解决现有技术中柔性直流智能输配电网系统缺乏保护的问题。Embodiments of the present invention provide a protection system and method for a flexible DC intelligent transmission and distribution network to solve the problem of lack of protection in the flexible DC intelligent transmission and distribution network system in the prior art.
为了解决上述技术问题，本发明实施例公开了如下技术方案：In order to solve the above technical problems, the embodiment of the present invention discloses the following technical solutions:
一种柔性直流智能输配电网的保护系统，应用于柔性直流智能输配电网，其特征在于，柔性直流智能输配电网包括依次电连接的交流母线、交流开关、联结变压器、电抗器、换流站和直流输电线路，以及一端接地、另一端电连接于联结变压器和电抗器之间的交流滤波器；保护系统包括依次电连接的交流开关场保护装置、换流器保护装置和直流输电线路保护装置，其中：交流开关场保护装置包括联结变压器保护组件、交流滤波器保护组件和换流母线设备保护组件；联结变压器保护组件包括联结变压器差动保护器、联结变压器过流和过负荷保护器、联结变压器过励磁保护器、联结变压器零序电流保护器和联结变压器非电量保护器；联结变压器差动保护器与联结变压器并联连接，联结变压器过流和过负荷保护器与联结变压器串联连接、且设置于联结变压器的高压侧，联结变压器零序电流保护器设置于联结变压器的接地一端的电路上，联结变压器过励磁保护器和联结变压器非电量保护器均与所述联结变压器并联连接；交流滤波器保护组件与交流滤波器串联连接，换流母线设备保护组件与电抗器并联连接；换流器保护装置与换流器串联连接，直流输电线路保护装置设置于直流输电线路上。A protection system for a flexible DC intelligent transmission and distribution network, applied to a flexible DC intelligent transmission and distribution network, characterized in that the flexible DC intelligent transmission and distribution network includes an AC busbar, an AC switch, a coupling transformer, a reactor, and a converter Station and DC transmission line, and an AC filter with one end grounded and the other end electrically connected between the coupling transformer and reactor; the protection system includes AC switchyard protection devices, converter protection devices and DC transmission line protection devices that are electrically connected in sequence device, wherein: the AC switchyard protection device includes a connection transformer protection component, an AC filter protection component and a converter bus equipment protection component; the connection transformer protection component includes a connection transformer differential protector, a connection transformer overcurrent and overload protector, The connection transformer over-excitation protector, the connection transformer zero-sequence current protector and the connection transformer non-electricity protector; the connection transformer differential protector is connected in parallel with the connection transformer, the connection transformer overcurrent and overload protector is connected in series with the connection transformer, and Set on the high-voltage side of the connecting transformer, the connecting transformer zero-sequence current protector is set on the circuit at the grounding end of the connecting transformer, the connecting transformer over-excitation protector and the connecting transformer non-electricity protector are connected in parallel with the connecting transformer; AC filter The converter protection component is connected in series with the AC filter, the converter bus equipment protection component is connected in parallel with the reactor; the converter protection device is connected in series with the converter, and the DC transmission line protection device is set on the DC transmission line.
优选地，换流母线保护组件包括换流母线差动保护器和换流母线过电压保护器。Preferably, the converter bus protection component includes a converter bus differential protector and a converter bus overvoltage protector.
优选地，换流器保护装置包括设置于换流站内的换流器过电流保护器、快速直流过电压保护器、交流侧过电压保护器、触阀脉冲监控器、IGBT自身保护器和辅助设备保护器。Preferably, the converter protection device includes a converter over-current protector, a fast DC over-voltage protector, an AC-side over-voltage protector, a valve pulse monitor, an IGBT self-protector and auxiliary equipment arranged in the converter station protector.
优选地，直流输电线路保护装置包括依次设置于直流输电线路上的微分欠压保护器、直流过压保护器和直流电压不平衡保护器。Preferably, the DC transmission line protection device includes a differential undervoltage protector, a DC overvoltage protector and a DC voltage unbalance protector sequentially arranged on the DC transmission line.
一种柔性直流智能输配电网的保护方法，对柔性直流智能输配电网分三个区域保护，包括：交流开关场区域、换流器区域和直流输电线路区域，其中：在交流开关场区域设置交流开关场保护装置，通过交流开关场保护装置的联结变压器保护组件、交流滤波器保护组件和换流母线设备保护组件分别保护联结变压器、交流滤波器和换流母线设备；通过所述联结变压器保护组件保护联结变压器，其中，通过联结变压器差动保护器、联结变压器过流和过负荷保护器、联结变压器过励磁保护器、联结变压器零序电流保护器以及联结变压器非电量保护器对联结变压器实行差动保护、过流和过负荷保护、过励磁保护、零序电流保护和非电量保护；在换流器区域设置换流器保护装置，通过换流器保护装置保护换流器以及换流器与联结变压器的连接线路；在直流输电线路区域设置直流输电线路保护装置，通过直流输电线路保护装置保护直流输电线路。A protection method for a flexible DC intelligent transmission and distribution network, which divides the protection of the flexible DC intelligent transmission and distribution network into three areas, including: the AC switch yard area, the converter area and the DC transmission line area, wherein: the AC switch yard area is set The AC switchyard protection device respectively protects the connection transformer, the AC filter and the converter bus equipment through the connection transformer protection component, the AC filter protection component and the converter bus equipment protection component of the AC switch yard protection device; through the connection transformer protection The component protects the connection transformer, among which, the connection transformer is implemented by the connection transformer differential protector, the connection transformer overcurrent and overload protector, the connection transformer overexcitation protector, the connection transformer zero sequence current protector and the connection transformer non-electricity protector Differential protection, over-current and overload protection, over-excitation protection, zero-sequence current protection and non-electrical protection; set up converter protection devices in the converter area, and protect the converters and converters through the converter protection devices The connection line with the connection transformer; the DC transmission line protection device is installed in the DC transmission line area, and the DC transmission line is protected by the DC transmission line protection device.
优选地，通过换流母线设备保护组件保护换流母线设备，包括：通过换流母线差动保护器和换流母线过电压保护器对换流母线设备实行差动保护和过电压保护。Preferably, protecting the converter bus equipment through the converter bus equipment protection component includes: performing differential protection and overvoltage protection on the converter bus equipment through a converter bus differential protector and a converter bus overvoltage protector.
优选地，通过换流器保护装置保护换流器以及换流器与联结变压器的连接线路，包括：通过换流器过电流保护器、快速直流过电压保护器、交流侧过电压保护器、触阀脉冲监控器、IGBT自身保护器和辅助设备保护器对换流器以及换流器与联结变压器的连接线路实行过电流保护、快速直流过电压保护、交流侧过电压保护、触阀脉冲监控、IGBT自身保护和辅助设备保护。Preferably, the converter and the connection line between the converter and the connecting transformer are protected by a converter protection device, including: through a converter overcurrent protector, a fast DC overvoltage protector, an AC side overvoltage protector, a trigger Valve pulse monitor, IGBT self protector and auxiliary equipment protector implement overcurrent protection, fast DC overvoltage protection, AC side overvoltage protection, valve contact pulse monitoring, IGBT self protection and auxiliary equipment protection.
优选地，通过直流输电线路保护装置保护直流输电线路，包括：通过微分欠压保护器、直流过压保护器和直流电压不平衡保护器对直流输电线路实行微分欠压保护、直流过压保护和直流电压不平衡保护。Preferably, the direct current transmission line is protected by the direct current transmission line protection device, including: implementing differential undervoltage protection, direct current overvoltage protection and DC voltage unbalance protection.
由以上技术方案可见，本发明实施例提供的柔性直流智能输配电网的保护系统和方法，通过对线路的分区重叠配置保护，可以实现对柔性直流智能输配电网系统保护设置的无“盲区”，使得在故障或者其他异常情况下迅速切除系统中故障或不正常的运行设备，防止对系统造成损害或者感染其他部分的正常工作，从而保护柔性直流输配电系统中所有设备的安全稳定进行。It can be seen from the above technical solutions that the protection system and method of the flexible DC intelligent transmission and distribution network provided by the embodiment of the present invention can realize no "blind zone" for the protection setting of the flexible DC intelligent transmission and distribution network system by overlapping and configuring protection for the lines. , so that the faulty or abnormal operating equipment in the system can be quickly removed in the event of a fault or other abnormal conditions, preventing damage to the system or infecting the normal work of other parts, thereby protecting the safety and stability of all equipment in the flexible DC power transmission and distribution system.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，对于本领域普通技术人员而言，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, In other words, other drawings can also be obtained from these drawings under the premise of not paying creative work.
图1为本发明实施例提供的一种柔性直流智能输配电网的保护系统示意图；Figure 1 is a schematic diagram of a protection system for a flexible DC intelligent transmission and distribution network provided by an embodiment of the present invention;
图示说明：Graphical description:
1-交流开关场保护装置，2-换流器保护装置，3-直流输电线路保护装置，11-联结变压器保护组件，12-交流滤波器保护组件，13-换流母线设备保护组件，111-联结变压器差动保护器，112-联结变压器过流和过负荷保护器，113-联结变压器零序电流保护器。1-AC switchyard protection device, 2-converter protection device, 3-DC transmission line protection device, 11-coupling transformer protection component, 12-AC filter protection component, 13-converter bus equipment protection component, 111- Connect transformer differential protector, 112-connect transformer overcurrent and overload protector, 113-connect transformer zero-sequence current protector.
具体实施方式Detailed ways
为了使本技术领域的人员更好地理解本发明中的技术方案，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，所描述的实施例仅仅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他实施例，都应当属于本发明保护的范围。In order to enable those skilled in the art to better understand the technical solutions in the present invention, 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 The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
参见图1，为本发明实施例提供的一种柔性直流智能输配电网的保护系统示意图。Referring to FIG. 1 , it is a schematic diagram of a protection system for a flexible DC intelligent transmission and distribution network provided by an embodiment of the present invention.
柔性直流智能输配电网包括依次电连接的交流母线、交流开关、联结变压器、电抗器、换流站和直流输电线路，还包括交流滤波器，交流滤波器一端接地、另一端电连接于联结变压器和电抗器之间的导线上。The flexible DC intelligent transmission and distribution network includes AC busbars, AC switches, coupling transformers, reactors, converter stations and DC transmission lines that are electrically connected in sequence, and also includes AC filters. One end of the AC filter is grounded, and the other end is electrically connected to the coupling transformer. and the wire between the reactor.
将柔性直流智能输配电网分为三个区域，即包括交流母线、交流开关、联结变压器、电抗器和交流滤波器的交流开关场区域，包括换流站的换流器区域以及包括直流输电线路的直流输电线路区域。The flexible DC intelligent transmission and distribution network is divided into three areas, that is, the AC switchyard area including the AC bus, AC switches, coupling transformers, reactors and AC filters, the converter area including the converter station, and the DC transmission line area. DC transmission line area.
如图1所示，本发明实施例提供的柔性直流智能输配电网的保护系统对柔性直流智能输配电网系统分三个区域保护，包括在交流开关场区域设置的交流开关场保护装置1、在换流器区域设置的换流器保护装置2和在直流输电线路区域设置的直流输电线路保护装置3，其中，交流开关场保护装置1通过联结变压器保护组件11、交流滤波器保护组件12和换流母线设备保护组件13，实现对联结变压器、交流滤波器和换流母线设备的保护。As shown in Figure 1, the protection system of the flexible DC intelligent transmission and distribution network provided by the embodiment of the present invention is divided into three areas for the protection of the flexible DC intelligent transmission and distribution network system, including the AC switchyard protection device 1 set in the AC switchyard area, The converter protection device 2 set in the converter area and the DC transmission line protection device 3 set in the DC transmission line area, wherein the AC switchyard protection device 1 is connected by the transformer protection component 11, the AC filter protection component 12 and The converter bus equipment protection component 13 realizes the protection of the connection transformer, the AC filter and the converter bus equipment.
联结变压器保护组件11通过联结变压器差动保护器111、联结变压器过流和过负荷保护器112、联结变压器过励磁保护器、联结变压器零序电流保护器113和联结变压器非电量保护器实现对联结变压器实行差动保护、过流和过负荷保护、过励磁保护、零序电流保护和非电量保护。The connected transformer protection component 11 realizes pair connection by connecting the transformer differential protector 111, connecting the transformer over-current and overload protector 112, connecting the transformer over-excitation protector, connecting the transformer zero-sequence current protector 113 and connecting the transformer non-electricity protector The transformer implements differential protection, over-current and overload protection, over-excitation protection, zero-sequence current protection and non-electrical protection.
联结变压器差动保护器111与联结变压器并联连接，如电压表等，可以检测联结变压器从高压侧套管上的电流互感器到低压侧套管上的电流互感器之间的故障，通过检测基波电流差值，可判断是否为联结变压器内部接地故障或绕阻匝间短路，从而采取闭锁换流器和断开交流侧断路器的方式来保护联结变压器。The connection transformer differential protector 111 is connected in parallel with the connection transformer, such as a voltmeter, which can detect the fault between the connection transformer from the current transformer on the high-voltage side bushing to the current transformer on the low-voltage side bushing. The wave current difference can judge whether it is an internal ground fault of the coupling transformer or a short circuit between turns of the winding, so that the coupling transformer can be protected by blocking the converter and disconnecting the AC side circuit breaker.
联结变压器过流和过负荷保护器112与连接变压器串联连接、且设置于联结变压器的高压侧，如特殊保险丝等，通过检测联结变压器高压侧的电流，可判断联结变压器是否为过流或过负荷，当联结变压器过流时，保护装置可引发闭锁换流器和断开交流侧断路器的保护策略；当联结变压器过负荷时，保护装置可引发报警。The connection transformer over-current and overload protector 112 is connected in series with the connection transformer and is set on the high-voltage side of the connection transformer, such as a special fuse, etc. By detecting the current on the high-voltage side of the connection transformer, it can be judged whether the connection transformer is over-current or overloaded , when the connected transformer is over-current, the protection device can trigger the protection strategy of blocking the converter and disconnecting the AC side circuit breaker; when the connected transformer is overloaded, the protection device can trigger an alarm.
联结变压器零序电流保护器113设置于联结变压器的接地一端的电路上，通过测量联结变压器中心点的电流值，通过闭锁换流器和跳开交流侧断路器的方式，保护具有二次谐波的制动功能。The connection transformer zero-sequence current protector 113 is set on the circuit at the grounding end of the connection transformer. By measuring the current value at the center point of the connection transformer, by blocking the converter and tripping the AC side circuit breaker, the protection device with the second harmonic braking function.
联结变压器过励磁保护器和联结变压器非电量保护器均与联结变压器并联连接，联结变压器过励磁保护器可根据厂家提供的过励磁曲线进行配置，选择联结变压器交流母线电压比值与频率比值和延时，确定保护整定值，如发生异常，可通过闭锁换流器和跳交流侧断路器来实施保护；联结变压器非电量保护器可以检测联结变压器在油位异常、气味异常、绕阻温度异常等，在异常条件下，通过跳开联结变压器交流开关断路器实施保护。Both the connection transformer over-excitation protector and the connection transformer non-electricity protector are connected in parallel with the connection transformer. The connection transformer over-excitation protector can be configured according to the over-excitation curve provided by the manufacturer, and the connection transformer AC bus voltage ratio and frequency ratio and delay are selected. , to determine the protection setting value, if an abnormality occurs, the protection can be implemented by blocking the converter and tripping the AC side circuit breaker; the non-electricity protector of the connected transformer can detect abnormal oil level, abnormal smell, abnormal winding temperature, etc. of the connected transformer, Under abnormal conditions, protection is implemented by tripping the AC switch circuit breaker of the coupling transformer.
交流滤波器保护组件12与交流滤波器器串联连接，对构成交流滤波器的电容器、电抗器和电阻以及并联电容器组等元件进行保护，通过闭锁换流器和跳交流侧断路器，使其不被欠电压或过电流所损坏。The AC filter protection component 12 is connected in series with the AC filter, and protects components such as capacitors, reactors, resistors, and parallel capacitor banks that constitute the AC filter, and prevents them from Damaged by undervoltage or overcurrent.
换流母线保护组件13与电抗器并联连接，换流母线保护组件13通过换流母线差动保护器和换流母线过电压保护器对换流母线设备实行差动保护和过电压保护，通过测量换流器母线的各相电压与电流，并与整定值相比较，若发生异常，通过闭锁换流器和跳交流侧断路器对换流母线实施保护。The converter bus protection component 13 is connected in parallel with the reactor, and the converter bus protection component 13 implements differential protection and overvoltage protection for the converter bus equipment through the converter bus differential protector and the converter bus overvoltage protector. The voltage and current of each phase of the converter bus are compared with the set value. If an abnormality occurs, the converter bus is protected by blocking the converter and tripping the AC side circuit breaker.
换流器保护装置2与换流器串联连接，换流器保护装置2通过换流器过电流保护器、快速直流过电压保护器、交流侧过电压保护器、触阀脉冲监控器、IGBT自身保护器和辅助设备保护器对换流器以及换流器与联结变压器的连接线路实行过电流保护、快速直流过电压保护、交流侧过电压保护、触阀脉冲监控、IGBT自身保护和辅助设备保护。发现问题时，可通过闭锁换流器和跳交流侧断路器而对换流器、换流器与联结变压器的部分连接线路以及换流器控制保护系统等设备实施保护。The converter protection device 2 is connected in series with the converter, and the converter protection device 2 passes through the converter overcurrent protector, the fast DC overvoltage protector, the AC side overvoltage protector, the valve contact pulse monitor, and the IGBT itself Protectors and auxiliary equipment protectors implement overcurrent protection, fast DC overvoltage protection, AC side overvoltage protection, valve contact pulse monitoring, IGBT self-protection and auxiliary equipment protection for the converter and the connection line between the converter and the connecting transformer . When a problem is found, the converter, the part of the connection line between the converter and the connecting transformer, and the converter control and protection system can be protected by blocking the converter and tripping the AC side circuit breaker.
直流输电线路保护装置3设置于直流输电线路上，直流输电线路保护装置3通过微分欠压保护器、直流过压保护器和直流电压不平衡保护器对直流输电线路实行微分欠压保护、直流过压保护和直流电压不平衡保护。发现问题时，可通过闭锁换流器和跳开交流、直流侧断路器来对直流输电线路实施保护。The DC transmission line protection device 3 is arranged on the DC transmission line, and the DC transmission line protection device 3 implements differential undervoltage protection, DC overvoltage protection, and DC overvoltage protection for the DC transmission line through a differential undervoltage protector, a DC overvoltage Overvoltage protection and DC voltage unbalance protection. When a problem is found, the DC transmission line can be protected by blocking the converter and tripping the AC and DC side circuit breakers.
本发明实施例提供的柔性直流智能输配电网的保护系统和方法，通过对线路的分区重叠配置保护，可以实现对柔性直流智能输配电网系统保护设置的无“盲区”，使得在故障或者其他异常情况下迅速切除系统中故障或不正常的运行设备，防止对系统造成损害或者感染其他部分的正常工作，从而保护柔性直流输配电系统中所有设备的安全稳定进行。The protection system and method of the flexible DC intelligent transmission and distribution network provided by the embodiments of the present invention can realize no "blind zone" for the protection setting of the flexible DC intelligent transmission and distribution network system by overlapping and configuring protection for the lines, so that in the event of a fault or other Under abnormal circumstances, quickly remove faulty or abnormal operating equipment in the system to prevent damage to the system or infect the normal work of other parts, thereby protecting the safety and stability of all equipment in the flexible DC transmission and distribution system.
以上所述仅是本发明的具体实施方式，使本领域技术人员能够理解或实现本发明。对这些实施例的多种修改对本领域的技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。The above descriptions are only specific embodiments of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
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| CN109038520B (en) * | 2018-09-06 | 2020-04-07 | 华北电力大学（保定） | Method for identifying AC/DC fault in converter station and protecting and coordinating AC/DC fault in converter station |
| CN109888751B (en) * | 2019-04-11 | 2021-02-12 | 南方电网科学研究院有限责任公司 | Direct-current overvoltage protection method, device and equipment for extra-high voltage direct-current transmission |
| CN111030065A (en) * | 2019-12-10 | 2020-04-17 | 平高集团有限公司 | A method for setting fault protection zones of a multi-terminal offshore DC wind farm system |
| CN111342428B (en) * | 2020-02-26 | 2022-03-15 | 合肥工业大学 | Transformer protection method based on temperature characteristic |
| CN111934302A (en) * | 2020-07-31 | 2020-11-13 | 国网福建省电力有限公司电力科学研究院 | System and method for restraining single-phase fault short-circuit current applied to flexible direct-current power transmission system |
| CN115632385B (en) * | 2022-11-15 | 2025-05-13 | 南方电网科学研究院有限责任公司 | Optimization method, control method and device for flexible DC short-delay differential protection |
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