WO2012122825A1 - 一种模块化多电平换流器阀保护方法 - Google Patents

一种模块化多电平换流器阀保护方法 Download PDF

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Publication number
WO2012122825A1
WO2012122825A1 PCT/CN2011/083115 CN2011083115W WO2012122825A1 WO 2012122825 A1 WO2012122825 A1 WO 2012122825A1 CN 2011083115 W CN2011083115 W CN 2011083115W WO 2012122825 A1 WO2012122825 A1 WO 2012122825A1
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Prior art keywords
bridge arm
control host
sub
module
protection method
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PCT/CN2011/083115
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English (en)
French (fr)
Inventor
高阳
杨岳峰
王韧秋
贺之渊
张新刚
谢敏华
Original Assignee
中国电力科学研究院
国家电网公司
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Application filed by 中国电力科学研究院, 国家电网公司 filed Critical 中国电力科学研究院
Priority to US14/005,267 priority Critical patent/US9373950B2/en
Publication of WO2012122825A1 publication Critical patent/WO2012122825A1/zh

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/085—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current making use of a thermal sensor, e.g. thermistor, heated by the excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters

Definitions

  • the invention relates to the field of power electronic direct current transmission of a power system, and in particular to a modular multilevel converter valve protection method. Background technique:
  • Modular multilevel converter type DC transmission is a new generation multi-level voltage source converter DC transmission topology. It uses multiple sub-modules in series and adopts a specific triggering method to make the bridge arm voltage waveform close to the sine, but the third The internal circulation between the phases causes the sinusoidal current flowing through the bridge arm to be distorted, increasing the peak value of the bridge arm current, thereby increasing the current capacity requirement of the switching device.
  • the converter of a flexible direct current power transmission device is composed of a switchable device that first constitutes a submodule, and then a modular multilevel converter composed of a series of submodules.
  • Modular multi-level converter valve is the core and key equipment of flexible DC transmission, ensuring its safe, reliable and stable operation. It is not only the requirements of the system to the device, but also the requirements of the device protection itself. Summary of the invention:
  • the technical problem to be solved by the present invention is to design a modular multi-level converter valve protection method to ensure reliable operation of the modular multi-level converter valve.
  • the invention provides a modular multi-level converter valve protection method, the modular multi-level converter valve is composed of 6 bridge arms, and the bridge arm comprises a sub-module, and the improvement is that The method includes the following steps:
  • the bridge arm controls the submodule IGBT to be turned off; wherein the off IGBT is a faulty IGBT.
  • the bridge arm control host closes the bypass switch of the sub-module
  • the bridge arm control host sends a trip request to the summary control host
  • the bridge arm control host When the bridge arm control host receives the information timeout, the bridge arm control host sends a system switch to the total control host. begging;
  • the bridge arm control host sends a trip request accompanying the thyristor trigger to the summary control host;
  • step 2) when the fault still exists, the bridge arm control host closes the bypass switch of the submodule, and sends the fault signal to the summary control host;
  • the summary control host controls the host's feedback information and the bridge arm current value to determine the bridge trip request, the thyristor trip request and the system switch request, and perform the bridge trip or trip with the thyristor trigger. Or switch the system that disconnects the valve as a whole.
  • the protection method of the first preferred solution provided by the present invention is improved in that the temporary failure of the step 2) means that the failure does not occur more than twice.
  • the protection method of the second preferred solution provided by the present invention is improved in that the timeout of receiving information by the aggregation control host of the step 2) means that the feedback signal is not received more than twice consecutive times.
  • the protection method of the third preferred embodiment provided by the present invention is improved in that the bridge arm current of the step 2) is excessively greater than the maximum value of the thyristor current setting.
  • the protection method of the fourth preferred solution provided by the present invention is improved in that the excessive number of bypasses of the sub-modules in the step 2) means that the number of sub-modules exceeds the set redundancy number.
  • the protection method of the fifth preferred solution provided by the present invention is improved in that the sub-module receiving the information failure in the step 2) means that the sub-module does not receive the signal.
  • the protection method of the sixth preferred embodiment provided by the present invention is improved in that the thyristor-triggered trip request of the step 2) is to apply for a circuit breaker that trips the inverter and simultaneously turns on the thyristor of each sub-module.
  • the seventh preferred embodiment of the present invention provides a protection method in which the bridge trip of the step 2) refers to opening the valve switch.
  • the protection method of the eighth preferred embodiment provided by the present invention is improved in that the bridge arm control host and the summary control host are both a valve base control device; the valve base control device includes a power source, an interface board, and a central processing unit .
  • the power supply, interface board, and central processing unit are connected through a backplane and fiber optics.
  • the method of hierarchical control protection proposed by the invention has clear division of protection scope of the converter valve, clear responsibility and simple and reliable design.
  • the protection scheme based on the bridge arm control host and the upper layer summary control host proposed by the invention can ensure the reliable operation of the modular multi-level converter valve to a large extent, and the adverse effect of a small number of individual failures on the entire valve operation is reduced. To the lowest.
  • the invention improves the reliability of the secondary protection system by adopting the double redundant protection system, and clarifies the protection division of labor through the hierarchical protection structure of the upper layer summary control host and the multi-bridge arm control host, and uses the bridge arm to control the host to return fault information to the module. The degree of control is judged to complete the valve arm protection, and the summary and overall protection are performed by the upper-level summary control host, which ultimately improves the safety and reliability of the entire modular multi-level converter valve.
  • Figure 1 is a schematic view of an inverter provided by the present invention
  • FIG. 2 Schematic diagram of the sub-module proposed by the present invention. detailed description
  • the scheme proposes two sets of protection schemes for the simultaneous protection of the protection system, that is, the two sets of bridge arm control hosts and the summary control hosts respectively constitute A and B.
  • Two sets of control protection systems The two systems are master-slave, do not affect each other, and independently complete the fault judgment of the system.
  • the two systems have the same status, and randomly select one set at the time of booting. One of them is further described as the present embodiment.
  • QF1 is a circuit breaker that connects the grid voltage to the inverter.
  • the converter needs to be connected to the grid (the symbol similar to the inductor symbol in Figure 1).
  • the modular multi-level converter valve consists of 6 bridge arms. Each bridge arm can be regarded as one unit. Each bridge arm is made up of sub-modules in series. The number of sub-modules on the bridge arm varies according to engineering needs. In contrast, some sub-modules are omitted by dashed lines in the figure.
  • Each bridge arm is fault-detected and protected by the sub-module of the bridge arm by a separate control host. The upper arm of the 6-arm control panel is completed by a summary control host. 6 bridge arm fault summary and integral valve protection.
  • the submodule includes two IGBTs with anti-parallel diodes, one thyristor, and one bypass switch.
  • the control host is called a valve-based control device.
  • the valve-based control device includes a power supply, an interface board, and a central processing unit.
  • the power supply, interface board, and central processing unit are connected through a backplane and fiber optics.
  • the interface board is responsible for connecting the submodules.
  • Each bridge arm has a control host to complete the protection of the bridge arm.
  • Each control host makes a judgment according to the type of fault.
  • the judgment result is divided into the following four categories:
  • the first type is the lock submodule, which is to close all the upper and lower IGBTs of the submodule.
  • the second type is the bypass sub-module, which closes the bypass switch of the sub-module so that it does not affect the inverter;
  • the third type is the trip request, that is, the incoming line breaker that applies for jumping off the converter;
  • the fourth category is The system switches the request, that is, uses a redundant control protection system.
  • the specific judgment method is as follows:
  • the first category includes the following faults: submodule IGBT or drive short-term fault; the second category includes the following faults: submodule Block receiving information fault, sub-module over-voltage fault, sub-module under-voltage fault, frequent verification error when sub-module receives information, frequent failure of IGBT or drive;
  • the third category includes the following faults: Sub-module bypass switch rejection, sub-module There are too many bypasses.
  • the fourth type of fault includes the following faults: The bridge arm control host receives the upper layer information timeout.
  • the protection method of the blocking sub-module is adopted. Such a module is still part of the inverter. As long as the fault does not occur twice, it can continue to be used.
  • the bypass submodule protection method is adopted, and the bypassed submodule may not affect the inverter, and the inverter may continue to operate without being affected;
  • the protection method for the inter-hop request is adopted for the case where the number of bypass sub-modules exceeds the set redundancy number or the sub-module bypass switch is rejected, because the number of sub-modules remaining at this time cannot fully satisfy the minimum operation of the converter.
  • the upper summary control host communicates with each bridge arm control host to learn the fault condition of each bridge arm, according to which the global fault of the converter valve is processed, and the controller of the upper layer summary host detects the current feedback of the bridge arm current sensor. The value completes the overcurrent protection of the bridge arm.
  • the controller of the upper-level summary host controls the feedback information of the host and the bridge arm current value through the bridge arm, and divides the fault judgment result into the following three categories:
  • the first type of common trip request that is, the incoming line breaker that applies for jumping off the converter
  • This class includes the following specific faults:
  • the bridge arm control unit has a trip request;
  • the second type is a trip request triggered by a thyristor, that is, an incoming line breaker that requests to open the inverter simultaneously turns on the thyristor of each submodule, such as the following Specific fault:
  • the bridge arm current is too large;
  • the third type is the system switching request, this type includes the following specific faults:
  • the bridge arm controls the host's switching request, and the communication timeout occurs when receiving the upper layer.
  • the upper summary control host uploads the normal trip request of the bridge arm control host.
  • the inter-module trigger command of the sub-module is sent at the same time as the inter-slot request is sent, so as to ensure that the diode is not damaged in the case of blocking.
  • a method of issuing a system switching request is taken to switch the system to a non-faulty system.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Rectifiers (AREA)

Description

一种模块化多电平换流器阀保护方法
技术领域：
本发明涉及电力系统的电力电子直流输电领域，具体涉及一种模块化多电平换流器 阀保护方法。 背景技术：
模块化多电平换流器型直流输电是新一代多电平电压源换流器直流输电拓扑，它利 用多个子模块串联，并采用特定的触发方式使桥臂电压波形逼近正弦，但其三相间的内 部环流使得流过桥臂的正弦电流产生畸变，增大了桥臂电流的峰值，从而提高了对开关 器件电流容量的要求。
柔性直流输电装置的换流器由可关断器件首先构成子模块， 再由子模块串联组成的 模块化多电平换流器。 模块化多电平换流器阀作为柔性直流输电的核心、 关键设备， 保 证其安全可靠稳定的运行， 不仅是系统对装置的要求， 更是装置保护自身的要求。 发明内容：
针对现有技术的不足，本发明所要解决的技术问题是设计一种模块化多电平换流器 阀保护方法， 保证模块化多电平换流阀的可靠运行。
本发明提供的一种模块化多电平换流器阀保护方法，所述模块化多电平换流器阀由 6个桥臂组成， 所述桥臂包括子模块， 其改进之处在于， 所述方法包括以下步骤：
1)将所述桥臂与桥臂控制主机的一端连接，所述桥臂控制主机的另一端与汇总控制 主机连接；
2) 当出现子模块 IGBT或驱动暂时性故障时， 所述桥臂控制主机将子模块 IGBT关 断； 其中所述关断的 IGBT为出现故障的 IGBT。
当子模块接收信息故障、 子模块过压故障、 子模块欠压故障、 子模块接收信息时频 繁校验错和 IGBT或驱动频繁故障时， 所述桥臂控制主机将子模块的旁路开关闭合； 当子模块旁路开关拒动、 子模块旁路数目过多时， 所述桥臂控制主机对汇总控制主 机发送跳闸请求；
当桥臂控制主机接收信息超时， 所述桥臂控制主机对总控制主机发送系统切换请 求；
当桥臂电流过大时，所述桥臂控制主机对汇总控制主机发送伴随晶闸管触发的跳闸 请求；
3) 执行步骤 2) 后， 故障仍存在时， 所述桥臂控制主机将子模块的旁路开关闭合， 并将故障信号汇总发送给汇总控制主机；
4) 汇总控制主机通过桥臂控制主机的反馈信息以及桥臂电流值， 进行对桥臂跳闸 请求、 伴随晶闸管触发的跳闸请求和系统切换请求的判断， 并执行桥臂跳闸或伴随晶闸 管触发的跳闸或整体将阀断开的系统切换。
本发明提供的第一优选方案的保护方法， 其改进之处在于， 所述步骤 2) 的所述暂 时性故障是指故障不连续发生 2次以上。
本发明提供的第二优选方案的保护方法， 其改进之处在于， 所述步骤 2) 的所述汇 总控制主机接收信息超时是指连续 2次以上接收不到反馈信号。
本发明提供的第三优选方案的保护方法， 其改进之处在于， 所述步骤 2) 的所述桥 臂电流过大是指超过晶闸管电流设定的最大值。
本发明提供的第四优选方案的保护方法， 其改进之处在于， 所述步骤 2) 的所述子 模块旁路数目过多是指子模块数目超过设定冗余数。
本发明提供的第五优选方案的保护方法， 其改进之处在于， 所述步骤 2) 的所述子 模块接收信息故障是指子模块接不到信号。
本发明提供的第六优选方案的保护方法， 其改进之处在于， 所述步骤 2) 的所述伴 随晶闸管触发的跳闸请求是申请跳开换流器的断路器同时开通每个子模块的晶闸管。
本发明提供的第七优选方案的保护方法， 其改进之处在于， 所述步骤 2) 的所述桥 臂跳闸是指断开阀开关。
本发明提供的第八优选方案的保护方法， 其改进之处在于， 所述桥臂控制主机和汇 总控制主机均为阀基控制设备； 所述阀基控制设备包括电源、 接口板和中央处理器。 电 源、 接口板和中央处理器通过背板和光纤连接。
与现有技术比， 本发明的有益效果为：
本发明所提出的分层控制保护的方法将换流阀的保护范围分工明确， 责任清晰， 设 计简单可靠。
本发明所提出的基于桥臂控制主机和上层汇总控制主机的保护方案能够在较大程 度上保证模块化多电平换流阀的可靠运行，将少量个体故障对整个阀运行造成的不利影 响降到最低。 本发明通过采用双冗余保护系统提高了二次保护系统的可靠性，通过上层汇总控制 主机与多桥臂控制主机的分层保护构架明晰了保护分工，利用桥臂控制主机对模块返回 故障信息控制程度得出判断类型来完成阀桥臂保护，通过上层汇总控制主机进行汇总和 整体保护， 最终使整个模块化多电平换流器阀的安全性与可靠性得到提升。
附图说明
图 1 : 本发明提供的换流器的示意图；
图 2: 本发明提出的子模块示意图。 具体实施方式
下面对本发明的具体实施方式作进一步的详细说明。
为了保证一次设备不因为二次设备的故障而停运或失控，本方案提出了两套控制保 护系统同时热备用的保护方案， 即由两套桥臂控制主机和汇总控制主机分别构成 A和 B 两套控制保护系统。 两系统一主一从， 不相互影响， 相互独立的去完成本系统的故障判 断。 两套系统的地位相同， 开机时随机或人为选取一套作为主。 以其中一套作为本实施 方式进一步的说明。
如图 1所示， QF1为断路器， 连接电网电压和换流器， 换流器需要接电抗器（图 1 中类似于电感符号的符号） 与电网相连。 模块化多电平换流器阀由 6个桥臂组成， 每个 桥臂可以看做一个单位， 每个桥臂由子模块串联而成， 桥臂上的子模块的数量根据工程 需要不同而会有不同， 图中用虚线省略了部分子模块。 每个桥臂由单独的控制主机完成 本桥臂的子模块的故障检测以及保护， 6个桥臂控制主机上层由一个汇总控制主机完成 6个桥臂故障汇总以及整体阀保护。 如图 2所示， 子模块的包括 2个带反并联二极管的 IGBT、 1个晶闸管、 1个旁路开关。 控制主机为称阀基控制设备。 阀基控制设备包括电 源、 接口板和中央处理器。 电源、 接口板和中央处理器通过背板和光纤连接。 接口板负 责连接子模块。
每个桥臂各自有一个控制主机完成本桥臂的保护， 每个控制主机根据故障类型做出 判断， 判断结果分为以下四类： 第一类是闭锁子模块， 即将子模块上下 IGBT全部关断； 第二类是旁路子模块， 即将子模块的旁路开关闭合使其不在影响换流器； 第三类是跳闸 请求， 即申请跳开换流器的进线断路器； 第四类是系统切换请求， 即采用冗余的控制保 护系统。 具体判断方式如下：
第一类包括以下故障： 子模块 IGBT或驱动短时故障； 第二类包括以下故障： 子模 块接收信息故障， 子模块过压故障、 子模块欠压故障、 子模块接收信息时频繁校验错、 IGBT或驱动频繁故障； 第三类包括以下故障： 子模块旁路开关拒动、子模块旁路数目过 多， 第四类故障包括以下故障： 桥臂控制主机接收上层信息超时。
对于暂时性的 IGBT或驱动短时故障的子模块采取闭锁子模块的保护方法， 这样的 模块依然属于换流器的一部分， 只要不连续 2次出现此故障， 依然可以继续使用。 对于 已确定模块故障无法使用或无法准确知道其状态的子模块， 采取旁路子模块的保护方 法， 被旁路的子模块会不在对换流器有影响， 换流器可以不受影响继续运行； 对于旁路 子模块数目超过设定冗余数或者子模块旁路开关拒动等情况采取发跳间请求的保护方 法， 因为此时所剩下的子模块数已经不能完全满足变流器工作的最低要求。 一旦跳闸请 求被相应， 各桥臂所有可控的子模块将处于闭锁状态， 即两 IGBT均关断状态。 对于当 前控制保护系统设备出现故障情况， 采取发出系统切换请求的方法。
上层汇总控制主机与各个桥臂控制主机进行通信， 以便获知各个桥臂的故障情况， 据此对换流阀的全局故障予以处理，此外上层汇总主机的控制器通过检测桥臂电流传感 器的电流反馈值完成桥臂的过流保护。上层汇总主机的控制器通过桥臂控制主机的反馈 信息以及桥臂电流值， 将故障判断结果分为以下三类： 第一类普通跳闸请求， 即申请跳 开换流器的进线断路器， 此类包括以下具体故障： 桥臂控制主机有跳闸请求； 第二类是 伴随晶闸管触发的跳闸请求， 即申请跳开换流器的进线断路器同时开通每个子模块的晶 闸管， 此类包括以下具体故障： 桥臂电流过大； 第三类是系统切换请求， 此类包括以下 具体故障： 桥臂控制主机的切换请求、 接收上层时出现通信超时。
上层汇总控制主机对于桥臂控制主机的普通跳闸请求予以上传。 此外如发现桥臂 过流会发送跳间请求的同时下发子模块晶间管触发命令， 以便保证闭锁情况下二极管不 被损坏。 对于当前系统设备出现故障情况， 采取发出系统切换请求的方法， 以便将系统 切换到无故障的系统工作。
最后应该说明的是： 结合上述实施例仅说明本发明的技术方案而非对其限制。 所 属领域的普通技术人员应当理解到： 本领域技术人员可以对本发明的具体实施方式进行 修改或者等同替换， 但这些修改或变更均在申请待批的权利要求保护范围之中。

Claims

权 利 要 求
1.一种模块化多电平换流器阀保护方法，所述模块化多电平换流器阀由 6个桥臂组 成， 所述桥臂包括子模块， 其特征在于， 所述方法包括以下步骤：
1)将所述桥臂与桥臂控制主机的一端连接，所述桥臂控制主机的另一端与汇总控制 主机连接；
2) 当出现子模块 IGBT或驱动暂时性故障时， 所述桥臂控制主机将子模块 IGBT关 断；
当子模块接收信息故障、 子模块过压故障、 子模块欠压故障、 子模块接收信息时频 繁校验错和 IGBT或驱动频繁故障时， 所述桥臂控制主机将子模块的旁路开关闭合； 当子模块旁路开关拒动、 子模块旁路数目过多时， 所述桥臂控制主机对汇总控制主 机发送跳闸请求；
当桥臂控制主机接收信息超时， 所述桥臂控制主机对总控制主机发送系统切换请 求；
当桥臂电流过大时，所述桥臂控制主机对汇总控制主机发送伴随晶闸管触发的跳闸 请求；
3) 执行步骤 2) 后， 故障仍存在时， 所述桥臂控制主机将子模块的旁路开关闭合， 并将故障信号汇总发送给汇总控制主机；
4) 汇总控制主机通过桥臂控制主机的反馈信息以及桥臂电流值， 进行对桥臂跳闸 请求、 伴随晶闸管触发的跳闸请求和系统切换请求的判断， 并执行桥臂跳闸或伴随晶闸 管触发的跳闸或整体将阀断开的系统切换。
2.如权利要求 1所述的保护方法， 其特征在于， 所述步骤 2) 的所述暂时性故障是 指故障不连续发生 2次以上。
3.如权利要求 1所述的保护方法， 其特征在于， 所述步骤 2) 的所述汇总控制主机 接收信息超时是指连续 2次以上接收不到反馈信号。
4.如权利要求 1所述的保护方法， 其特征在于， 所述步骤 2) 的所述桥臂电流过大 是指超过桥臂电流设定的最大值。
5.如权利要求 1所述的保护方法， 其特征在于， 所述步骤 2) 的所述子模块旁路数 目过多是指子模块数目超过设定冗余数。
6.如权利要求 1所述的保护方法， 其特征在于， 所述步骤 2) 的所述子模块接收信 息故障是指子模块接不到信号。
7.如权利要求 1所述的保护方法， 其特征在于， 所述步骤 2) 的所述伴随晶闸管触 发的跳闸请求是申请跳开换流器的断路器同时开通每个子模块的晶闸管。
8.如权利要求 1所述的保护方法， 其特征在于， 所述步骤 2) 的所述桥臂跳闸是指 断开阀断路器。
9.如权利要求 1所述的保护方法， 其特征在于， 所述桥臂控制主机和汇总控制主机 均为阀基控制设备； 所述阀基控制设备包括电源、 接口板和中央处理器。 电源、 接口板 和中央处理器通过背板和光纤连接。
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