WO2018201708A1 - 桥臂电流过流保护方法、控制系统及存储介质 - Google Patents
桥臂电流过流保护方法、控制系统及存储介质 Download PDFInfo
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- WO2018201708A1 WO2018201708A1 PCT/CN2017/113210 CN2017113210W WO2018201708A1 WO 2018201708 A1 WO2018201708 A1 WO 2018201708A1 CN 2017113210 W CN2017113210 W CN 2017113210W WO 2018201708 A1 WO2018201708 A1 WO 2018201708A1
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- current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. DC/AC converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/36—Arrangements for transfer of electric power between AC networks via high-voltage DC [HVDC] links; Arrangements for transfer of electric power between generators and networks via HVDC links
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Definitions
- the present invention relates to the field of current protection technologies, and in particular, to a bridge arm current overcurrent protection method, a control system, and a storage medium.
- the flexible multi-level converter (MMC) based flexible DC transmission system has The characteristics of simple structure and easy engineering implementation have attracted wide attention from experts and scholars at home and abroad in recent years.
- the modular multilevel converter consists of three phases of six bridge arms, each of which is formed by a cascade of coupled or uncoupled inductors and a number of identical MMC sub-modules.
- the submodule may be a half bridge submodule, a full bridge submodule, and a clamped dual submodule. Take the half bridge submodule as an example.
- Each submodule contains two IGBTs, two reverse diodes and one DC capacitor.
- An important feature of the MMC topology is the placement of energy storage capacitors into sub-modules in series. This brings a series of problems. For example, due to the existence of the bridge arm current, the capacitance voltage of each sub-module changes momentarily. The bridge arm current rapidly becomes larger due to the short-circuit of the bridge arm, and reaches a maximum after several milliseconds. 2 is shown. How to quickly detect bridge arm overcurrent and clear the fault becomes a technical difficulty.
- the conventional bridge arm overcurrent protection method is cumbersome and the overcurrent protection reliability is low.
- the embodiment of the invention provides a bridge arm current overcurrent protection method for solving the problem that the existing bridge arm current overcurrent protection mode has low reliability.
- the invention also provides a bridge arm current overcurrent protection control system and a storage medium.
- an embodiment of the present invention provides a bridge arm current overcurrent protection method, including the following steps:
- the bridge arm current is protected when the current effective value is greater than a first set threshold and the current instantaneous value is greater than a second set threshold.
- the bridge arm current is processed, including:
- the processing of the bridge arm current includes:
- the instantaneous value of the current is determined based on the DC bus current and the bridge arm current amplitude.
- the current of the bridge arm is decomposed to obtain a DC component and an AC component, including:
- the DC component is obtained by the following formula,
- Ip(t) is the instantaneous value of the current and A is a constant.
- the embodiment of the invention further provides a bridge arm current overcurrent protection control system, comprising:
- An acquisition module configured to obtain a bridge arm current
- a calculation module configured to process the bridge arm current to obtain a current RMS value and a current instantaneous value
- the protection action control module is configured to protect the bridge arm current when the current effective value is greater than a first set threshold and the current instantaneous value is greater than a second set threshold.
- the collecting module is configured to collect a valve side outlet current and a DC bus current
- a bridge arm current is obtained based on the valve side outlet current and the DC bus current.
- the calculating module is configured to decompose the bridge arm current to obtain a DC component and an AC component
- the calculating module is configured to determine the current instantaneous value based on the DC bus current and the bridge arm current amplitude.
- the calculation module is further configured to obtain the DC component by using the following formula,
- Ip(t) is the instantaneous value of the current and A is a constant.
- the embodiment of the invention further provides an overcurrent protection control system for the bridge arm current, comprising:
- a memory configured to store an executable program
- the processor is configured to implement the overcurrent protection method of the bridge arm current described above by executing an executable program stored in the memory.
- the embodiment of the invention further provides a storage medium storing an executable program, and when the executable program is executed by the processor, implementing the overcurrent protection method of the bridge arm current.
- Bridge arm current overcurrent protection method, control system and storage medium provided by embodiments of the present invention.
- the collected bridge arm current is processed to obtain a current effective value and an instantaneous value, and an overcurrent determination is performed according to conditions satisfying the current effective value and the instantaneous value.
- the current effective value and the instantaneous value are both greater than the corresponding set threshold, Indicates that the actual current of the bridge arm has an overcurrent phenomenon, then controls the protection action and protects the outlet.
- the bridge arm current overcurrent protection method, the control system and the storage medium provided by the embodiments of the invention have simple implementation process, less judgment parameters involved, higher protection reliability, and correspondingly, the judgment is fast and effective. In the event of a fault, the impact of the bridge arm current on each sub-module is greatly reduced, and the sub-module is quickly protected from the fault current.
- FIG. 2 is a schematic diagram showing current changes of a bridge arm current when a bridge arm is short-circuited in the related art
- FIG. 3 is a schematic diagram of a topological structure applicable to a method for protecting a bridge arm current overcurrent according to an embodiment of the present invention
- FIG. 4 is a schematic diagram of a processing flow of a bridge arm current overcurrent protection method according to an embodiment of the present invention
- FIG. 5 is a schematic diagram of calculating an effective value according to an alternating current component and a direct current component according to an embodiment of the present invention
- Figure 6 is a logic diagram of the bridge arm current protection exit
- FIG. 7 is a schematic structural diagram of a bridge arm current overcurrent protection control system according to an embodiment of the present invention.
- FIG. 8 is a schematic diagram showing the hardware structure of an overcurrent protection control system for bridge arm current according to another embodiment of the present invention.
- the bridge arm current overcurrent protection method is applicable to the flexible DC power transmission system, as shown in FIG. 3, which is a schematic diagram of a topology structure applicable to the bridge arm current overcurrent protection method provided by the embodiment of the present invention, and the structure is only For one of the bridge arms, therefore, the method is essentially applicable to the MMC structure shown in Figure 1, and is further applicable to symmetric pseudo-bipolar structures.
- the current on each leg of the MMC, the current on the DC line, and the current flow of the upper and lower arms are as shown in Figure 1.
- the bridge arm current of the a-phase upper arm is Ip_a
- the bridge arm current of the lower phase of the a-phase is In_b
- the bridge arm current of the b-phase upper arm is Ip_b
- the bridge arm current of the b-phase lower arm is In_b
- the bridge arm current of the c-stage upper arm is Ip_c
- the bridge arm current of the c-phase lower arm is In_c.
- the processing flow of the bridge arm current overcurrent protection method provided by the embodiment of the present invention, as shown in FIG. 4, includes:
- Step S101 acquiring a bridge arm current.
- corresponding power devices such as current detecting devices, control devices, and protection devices
- the bridge arm current of the bridge arm is collected by the current detecting device.
- Current detecting devices are disposed on each of the bridge arms. Since these devices are conventional, they are not described in detail here. Since the implementation process of the overcurrent protection method of each bridge arm is the same, the following one of the bridge arms will be described as an example.
- the detected bridge arm current is transmitted to the control device.
- step S102 the bridge arm current is processed to obtain a current effective value and a current instantaneous value.
- control device processes and analyzes the bridge arm current to obtain current rms and current instantaneous values:
- the instantaneous value of the current can be obtained according to the existing method of obtaining, and the following embodiment is given in this embodiment:
- Ip is the bridge arm current
- Ip(t) is the current instantaneous value
- I DP is the DC bus current
- I VC is the valve side outlet current
- a is the bridge arm current amplitude.
- a method for calculating the current effective value is given. Specifically, the bridge arm current is decomposed to obtain a DC component and an AC component of the current. And, the DC component and the AC component of the current are obtained by the following two calculation formulas.
- the formula for calculating the DC component is:
- the formula for calculating the AC component is:
- A is a constant, set according to actual requirements, such as 1488.
- n*A The sum of the sinusoidal functions in one cycle is 0, and the sum of one DC quantity is n*A, so after calculating the average value of the bridge arm current, only n*A/n remains DC component, which can be extracted. Its DC component.
- This method of decomposition is fast, simple, and effective, and does not require the use of low-pass filtering.
- the current effective value is calculated according to the direct current component and the alternating current component, as shown in FIG. 5, and the calculation method is: obtaining the root mean square of the direct current component and the alternating current component, and the obtained root mean square value is that the current effective value I is valid .
- the calculation formula is:
- I AC is the AC component of the bridge arm current and I DC is the DC component of the bridge arm current.
- Step S103 when the current effective value is greater than the first set threshold, and the current instantaneous value is greater than the second set threshold, the bridge arm current is protected.
- control device determines, according to the obtained current effective value and the instantaneous value, whether the current effective value is greater than the first set threshold, and whether the current instantaneous value is greater than the second set threshold;
- the first set threshold and the second set threshold may be set according to actual control requirements.
- the protection logic is judged as shown in FIG. 6. For example: when Ip_a_ If the effective threshold is greater than the set threshold ⁇ 1 and the Ip_a_ is instantaneously greater than the set threshold ⁇ 2, then the bridge arm overcurrents in the a phase, and the protection action.
- the structure of the bridge arm current overcurrent protection control system includes three modules, which are:
- the acquisition module 11 is configured to acquire a bridge arm current
- the calculating module 12 is configured to process the bridge arm current to obtain a current RMS value and a current instantaneous value
- the protection action control module 13 is configured to protect the action when the current effective value is greater than the first set threshold and the current instantaneous value is greater than the second set threshold.
- the three modules of the control system are function blocks, wherein the acquisition module 11 can be a hardware module, and the other two modules are loaded into the control device to implement corresponding functions, then the protection scope of the overcurrent protection control system is Overcurrent protection method. Since the method has been described in detail in the above method embodiment, it will not be specifically described herein.
- the embodiment of the invention further provides a parameter configuration device, the hardware component structure of the parameter configuration device, comprising: a memory configured to store an executable program;
- a processor configured to execute an executable program stored in the memory, executes:
- the bridge arm current is protected when the current effective value is greater than a first set threshold and the current instantaneous value is greater than a second set threshold.
- a bridge arm current is obtained based on the valve side outlet current and the DC bus current.
- the instantaneous value of the current is determined based on the DC bus current and the bridge arm current amplitude.
- the DC component is obtained by the following formula,
- the AC component is obtained using the following formula,
- Ip(t) is the instantaneous value of the current and A is a constant.
- the overcurrent protection control system 700 for bridge arm current includes at least one processor 701, a memory 702, and at least one communication interface 704. .
- the various components in the overcurrent protection control system 700 of the bridge arm current are coupled together by a bus system 705. It will be appreciated that the bus system 705 is used to implement connection communication between these components.
- the bus system 705 includes a power bus, a control bus, and a status signal bus in addition to the data bus. However, for clarity of description, various buses are labeled as bus system 705 in FIG.
- memory 702 can be either volatile memory or non-volatile memory, and can include both volatile and nonvolatile memory.
- the non-volatile memory may be a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), or an Erasable Programmable Read (EPROM). Only Memory), Electrically Erasable Programmable Read-Only Memory (EEPROM), Magnetic Random Access Memory (FRAM, ferromagnetic random access memory), flash memory (Flash Memory), magnetic surface memory, optical disk, or CD-ROM (Compact Disc Read-Only Memory); magnetic surface memory can be disk storage or tape Memory.
- the volatile memory can be a random access memory (RAM) that acts as an external cache.
- RAM Static Random Access Memory
- SSRAM Synchronous Static Random Access Memory
- SSRAM Dynamic Random Access
- DRAM Dynamic Random Access Memory
- SDRAM Synchronous Dynamic Random Access Memory
- DDRSDRAM Double Data Rate Synchronous Dynamic Random Access Memory
- ESDRAM enhancement Enhanced Synchronous Dynamic Random Access Memory
- SLDRAM Synchronous Dynamic Random Access Memory
- DRRAM Direct Memory Bus Random Access Memory
- Memory 702 in an embodiment of the invention is used to store various types of data to support operation of overcurrent protection control system 700 for bridge arm current.
- Examples of such data include any computer program for operating on parameter configuration device 700, such as operating system 7021 and application 7022; contact data; phone book data; messages; pictures;
- the operating system 7021 includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, for implementing various basic services and processing hardware-based tasks.
- the application 7022 can include various applications for implementing various application services. A program implementing the method of the embodiment of the present invention may be included in the application 7022.
- Processor 701 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 701 or an instruction in a form of software.
- the processor 701 described above may be a general purpose processor, a digital signal processor (DSP), or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or the like.
- DSP digital signal processor
- the processor 701 can implement or perform the various methods, steps, and logic blocks disclosed in the embodiments of the present invention.
- a general purpose processor can be a microprocessor or any conventional processor or the like.
- the steps of the method disclosed in the embodiment of the present invention may be directly implemented as a hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
- the software module can reside in a storage medium located in memory 702, which reads the information in memory 702 and, in conjunction with its hardware, performs the steps of the foregoing method.
- the bridge current overcurrent protection control system 700 may be implemented by one or more Application Specific Integrated Circuits (ASICs), DSPs, Programmable Logic Devices (PLDs), Complex Programmable Logic Device (CPLD), Field-Programmable Gate Array (FPGA), General Purpose Processor, Controller, Micro Controller Unit (MCU), Microprocessor (Microprocessor), or other electronic component implementation, for performing the aforementioned methods.
- ASICs Application Specific Integrated Circuits
- DSPs Programmable Logic Devices
- CPLD Complex Programmable Logic Device
- FPGA Field-Programmable Gate Array
- General Purpose Processor Controller
- MCU Micro Controller Unit
- Microprocessor Microprocessor
- the embodiment of the invention further provides a computer readable storage medium, on which a computer program is stored, which when executed by the processor, executes:
- the bridge arm current is protected when the current effective value is greater than a first set threshold and the current instantaneous value is greater than a second set threshold.
- a bridge arm current is obtained based on the valve side outlet current and the DC bus current.
- the instantaneous value of the current is determined based on the DC bus current and the bridge arm current amplitude.
- the DC component is obtained by the following formula,
- the AC component is obtained using the following formula,
- Ip(t) is the instantaneous value of the current and A is a constant.
- the bridge arm current overcurrent protection method, the control system and the storage medium provided by the embodiment of the invention obtain the bridge arm current; the bridge arm current is processed to obtain the current effective value and the current instantaneous value; when the current effective value is greater than The bridge arm current is protected when the first set threshold is set and the current instantaneous value is greater than the second set threshold.
- the implementation process of the program is simple and involves The judgment parameters are less, the protection reliability is higher, and accordingly, the judgment is fast and effective. In the event of a fault, the impact of the bridge arm current on each sub-module is greatly reduced, and the sub-module is quickly protected from the fault current.
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Abstract
一种柔性直流输电系统的桥臂电流过流保护方法、控制系统及存储介质，该方法包括获取桥臂电流（S101）；对桥臂电流进行处理，得到电流有效值和电流瞬时值（S102）；当电流有效值大于第一设定阈值，且电流瞬时值大于第二设定阈值时，对桥臂电流进行保护（S103）。
Description
相关申请的交叉引用
本申请基于申请号为201710301865.5、申请日为2017年05月02日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
本发明涉及电流保护技术领域，尤其涉及一种桥臂电流过流保护方法、控制系统及存储介质。
相对于传统的基于绝缘栅双极型晶体管(Insulated Gate Bipolar Transistor，IGBT)串联技术的柔性直流输电系统，基于模块化多电平换流器(modular multilevel converter，MMC)的柔性直流输电系统由于具有结构简单，易于工程实施等特点，在近年来引起了国内外专家学者的广泛关注。如图1所示，该模块化多电平换流器由三相六个桥臂构成，每个桥臂由耦合或者非耦合的电感和若干个完全相同的MMC子模块级联构成。其中，子模块可以是半桥子模块、全桥子模块以及箝位双子模块。就以半桥子模块为例，每个子模块包含两个IGBT，两个反向二极管和一个直流电容。
MMC拓扑结构中一个重要的特点是将储能电容放到了串联的子模块当中。这带来了一系列的问题，比如由于桥臂电流的存在，使得各个子模块的电容电压时刻在变化，由于发生桥臂短路时桥臂电流迅速变大，几个毫秒后达到最大，如图2所示。如何快速的检测桥臂过流及对故障清除成为一个技术难点。
目前，常规的桥臂过流保护方法过程较为繁琐，过流保护可靠性较低。
发明内容
有鉴于此，本发明实施例提供一种桥臂电流过流保护方，用以解决现有的桥臂电流过流保护方式可靠性较低的问题。本发明同时提供一种桥臂电流过流保护控制系统及存储介质。
为实现上述目的，本发明实施例提供一种桥臂电流过流保护方法，包括以下步骤：
获取桥臂电流；
对所述桥臂电流进行处理，得到电流有效值和电流瞬时值；
当所述电流有效值大于第一设定阈值，且所述电流瞬时值大于第二设定阈值时，对所述桥臂电流进行保护。
上述方案中，对所述桥臂电流进行保护
上述方案中，将所述桥臂电流进行处理，包括：
对所述桥臂电流进行分解，得到直流分量和交流分量；
计算所述直流分量和所述交流分量的均方根，得到所述电流有效值
上述方案中，所述对所述桥臂电流进行处理，包括：
基于所述直流母线电流和所述桥臂电流幅值，确定所述电流瞬时值。
上述方案中，所述对所述桥臂电流进行分解，得到直流分量和交流分量，包括：
利用如下公式获得所述直流分量，
并通过如下公式获得所述交流分量，
其中，Ip(t)为电流瞬时值，A为常数。
本发明实施例还提供一种桥臂电流过流保护控制系统，包括：
采集模块，配置为获取桥臂电流；
计算模块，配置为对所述桥臂电流进行处理，得到电流有效值和电流瞬时值；
保护动作控制模块，配置为当所述电流有效值大于第一设定阈值，且所述电流瞬时值大于第二设定阈值时，对所述桥臂电流进行保护。
上述方案中，所述采集模块，配置为采集阀侧出口电流及直流母线电流；
基于所述阀侧出口电流及所述直流母线电流，获取桥臂电流。
上述方案中，所述计算模块，配置为对所述桥臂电流进行分解，得到直流分量和交流分量；
计算所述直流分量和所述交流分量的均方根，得到所述电流有效值。
上述方案中，所述计算模块，配置为基于所述直流母线电流和所述桥臂电流幅值，确定所述电流瞬时值。
上述方案中，所述计算模块还配置为通过如下公式获得所述直流分量，
并通过如下公式获得所述交流分量，
其中，Ip(t)为电流瞬时值，A为常数。
本发明实施例还提供一种桥臂电流的过流保护控制系统，包括：
存储器，配置为存储可执行程序；
处理器，配置为通过执行所述存储器中存储的可执行程序时，实现上述的桥臂电流的过流保护方法。
本发明实施例还提供一种存储介质，存储有可执行程序，所述可执行程序被处理器执行时，实现上述的桥臂电流的过流保护方法。
本发明实施例提供的桥臂电流过流保护方法、控制系统及存储介质，
对采集到的桥臂电流进行处理，得到电流有效值和瞬时值，根据电流有效值和瞬时值满足的条件来进行过流判断，当电流有效值和瞬时值均大于对应的设定阈值时，表示桥臂的实际电流出现了过流现象，那么控制保护动作，保护出口。本发明实施例所提供的桥臂电流过流保护方法、控制系统及存储介质，实现过程简单，所涉及到的判断参量较少，保护可靠性较高，相应地，判断快速有效。在发生故障时，桥臂电流对各子模块的冲击大大减小，快速地保护子模块不受故障电流影响。
图1是相关技术中MMC基本拓扑结构图；
图2是相关技术中桥臂电流在桥臂短路时的电流变化示意图；
图3是本发明实施例桥臂电流过流保护方法所适用的拓扑结构示意图；
图4是本发明实施例桥臂电流过流保护方法的处理流程示意图；
图5是本发明实施例根据交流分量和直流分量计算有效值的示意图；
图6是桥臂电流保护出口逻辑图；
图7是本发明实施例桥臂电流过流保护控制系统的组成结构示意图。
图8是本发明另一实施例的桥臂电流的过流保护控制系统的硬件结构示意图。
本发明实施例中，桥臂电流过流保护方法适用于柔性直流输电系统，如图3所示，是本发明实施例提供的桥臂电流过流保护方法所适用的拓扑结构示意图，该结构只是针对其中一条桥臂而言，因此，该方法本质上适用于图1所示的MMC结构，进一步适用于对称伪双极结构。
MMC中的各桥臂上的电流、直流线路上的电流以及上下桥臂电流流向如图1所示。桥臂电流为Ip_j和In_j，其中j＝a，b，c，分别代表abc三相；
p表示上桥臂，n表示下桥臂。那么，a相上桥臂的桥臂电流为Ip_a，a相下桥臂的桥臂电流为In_b；b相上桥臂的桥臂电流为Ip_b，b相下桥臂的桥臂电流为In_b；c相上桥臂的桥臂电流为Ip_c，c相下桥臂的桥臂电流为In_c。
本发明实施例提供的桥臂电流过流保护方法的处理流程，如图4所示，包括：
步骤S101，获取桥臂电流。
为了实施该保护方法，输电系统中就要有相应的硬件设备，比如电流检测设备、控制设备以及保护设备，利用电流检测设备采集该桥臂的桥臂电流。各桥臂上均设置有电流检测设备。由于这些设备属于常规技术，这里就不再对其进行详述。由于各桥臂的过流保护方法的实现过程相同，那么，以下以其中一个桥臂为例进行说明。
电流检测设备采集该桥臂的桥臂电流后，将检测得到的桥臂电流传输到控制设备中。
步骤S102，对桥臂电流进行处理，得到电流有效值和电流瞬时值。
在一可选实施例中，控制设备对桥臂电流进行处理和分析，得到电流有效值和电流瞬时值：
其中，电流瞬时值可以按照现有中的求取方式进行求取，本实施例给出以下一种实施方式：
首先，桥臂电流的获取公式为：
然后，根据桥臂电流得到电流瞬时值，计算公式为：
其中，Ip为桥臂电流，Ip(t)为电流瞬时值，IDP为直流母线电流，IVC是
阀侧出口电流，a为桥臂电流幅值。
本实施例给出一种电流有效值的计算方法，具体为：对桥臂电流进行分解处理，得到电流的直流分量和交流分量。并且，利用以下两个计算公式得到电流的直流分量和交流分量。
直流分量的计算公式为：
交流分量的计算公式为：
其中，A为常数，根据实际要求进行设定，比如1488。
对一个周期内正弦函数求和，其和为0；对一个直流量一个周期求和为n*A，所以对桥臂电流计算平均值后n*A/n只剩下直流分量，即可以提取其直流分量。这种分解方法快速、简单、有效，无需运用低通滤波等环节。
然后，根据直流分量和交流分量计算电流有效值，如图5所示，计算方式为：求取直流分量和交流分量的均方根，得到的均方根值就是电流有效值I有效。计算公式为：
其中，IAC是桥臂电流的交流分量，IDC为桥臂电流的直流分量。
步骤S103，当电流有效值大于第一设定阈值，且电流瞬时值大于第二设定阈值时，对所述桥臂电流进行保护。
在一可选实施方式中，控制设备根据得到的电流有效值和瞬时值做出保护动作的判断；即判断电流有效值是否大于第一设定阈值，电流瞬时值是否大于第二设定阈；其中，第一设定阈值和第二设定阈值均可以根据实际控制需要进行设定。
以abc三相的上桥臂为例，保护逻辑判断如图6所示。例如：当Ip_a_
有效大于设定阈值Δ1，且Ip_a_瞬时大于设定阈值Δ2，那么，a相上桥臂过流，保护动作。
另外，通过降低桥臂电流的采集周期，能够进一步保证后续动作的快速性。
本发明实施例中，桥臂电流过流保护控制系统的组成结构，如图7所示，包括三个模块，分别是：
采集模块11，配置为对于获取桥臂电流；
计算模块12，配置为对桥臂电流进行处理，得到电流有效值和电流瞬时值；
保护动作控制模块13，配置为当电流有效值大于第一设定阈值，且电流瞬时值大于第二设定阈值时，保护动作。
所以，该控制系统的三个模块为功能块，其中，采集模块11可以是硬件模块，其他两个模块通过加载在控制设备中实现对应的功能，那么，该过流保护控制系统的保护范围是过流保护方法。由于在上述方法实施例中已对该方法做出了详细地描述，这里就不再具体说明。
本发明实施例还提供一种参数配置装置，所述参数配置装置的硬件组成结构，包括：存储器，配置为存储可执行程序；
处理器，配置为运行所述存储器中存储的可执行程序时，执行：
获取桥臂电流；
对所述桥臂电流进行处理，得到电流有效值和电流瞬时值；
当所述电流有效值大于第一设定阈值，且所述电流瞬时值大于第二设定阈值时，对所述桥臂电流进行保护。
在一实施例中，所述处理器用于运行所述计算机程序时，执行：
采集阀侧出口电流及直流母线电流；
基于所述阀侧出口电流及所述直流母线电流，获取桥臂电流。
在一实施例中，所述处理器用于运行所述计算机程序时，执行：
对所述桥臂电流进行分解，得到直流分量和交流分量；
计算所述直流分量和所述交流分量的均方根，得到所述电流有效值。
在一实施例中，所述处理器用于运行所述计算机程序时，执行：
基于所述直流母线电流和所述桥臂电流幅值，确定所述电流瞬时值。
在一实施例中，所述处理器用于运行所述计算机程序时，执行：
利用如下公式获得所述直流分量，
利用如下公式获得所述交流分量，
其中，Ip(t)为电流瞬时值，A为常数。
图8是本发明另一实施例的桥臂电流的过流保护控制系统的硬件结构示意图，桥臂电流的过流保护控制系统700包括：至少一个处理器701、存储器702、至少一个通信接口704。桥臂电流的过流保护控制系统700中的各个组件通过总线系统705耦合在一起。可理解，总线系统705用于实现这些组件之间的连接通信。总线系统705除包括数据总线之外，还包括电源总线、控制总线和状态信号总线。但是为了清楚说明起见，在图8中将各种总线都标为总线系统705。
可以理解，存储器702可以是易失性存储器或非易失性存储器，也可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(ROM，Read Only Memory)、可编程只读存储器(PROM，Programmable Read-Only Memory)、可擦除可编程只读存储器(EPROM，Erasable Programmable Read-Only Memory)、电可擦除可编程只读存储器(EEPROM，Electrically Erasable Programmable Read-Only Memory)、磁性随机存取存储
器(FRAM，ferromagnetic random access memory)、快闪存储器(Flash Memory)、磁表面存储器、光盘、或只读光盘(CD-ROM，Compact Disc Read-Only Memory)；磁表面存储器可以是磁盘存储器或磁带存储器。易失性存储器可以是随机存取存储器(RAM，Random Access Memory)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(SRAM，Static Random Access Memory)、同步静态随机存取存储器(SSRAM，Synchronous Static Random Access Memory)、动态随机存取存储器(DRAM，Dynamic Random Access Memory)、同步动态随机存取存储器(SDRAM，Synchronous Dynamic Random Access Memory)、双倍数据速率同步动态随机存取存储器(DDRSDRAM，Double Data Rate Synchronous Dynamic Random Access Memory)、增强型同步动态随机存取存储器(ESDRAM，Enhanced Synchronous Dynamic Random Access Memory)、同步连接动态随机存取存储器(SLDRAM，SyncLink Dynamic Random Access Memory)、直接内存总线随机存取存储器(DRRAM，Direct Rambus Random Access Memory)。本发明实施例描述的存储器702旨在包括但不限于这些和任意其它适合类型的存储器。
本发明实施例中的存储器702用于存储各种类型的数据以支持桥臂电流的过流保护控制系统700的操作。这些数据的示例包括：用于在参数配置装置700上操作的任何计算机程序，如操作系统7021和应用程序7022；联系人数据；电话簿数据；消息；图片；视频等。其中，操作系统7021包含各种系统程序，例如框架层、核心库层、驱动层等，用于实现各种基础业务以及处理基于硬件的任务。应用程序7022可以包含各种应用程序，用于实现各种应用业务。实现本发明实施例方法的程序可以包含在应用程序7022中。
上述本发明实施例揭示的方法可以应用于处理器701中，或者由处理
器701实现。处理器701可能是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法的各步骤可以通过处理器701中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器701可以是通用处理器、数字信号处理器(DSP，Digital Signal Processor)，或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。处理器701可以实现或者执行本发明实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本发明实施例所公开的方法的步骤，可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于存储介质中，该存储介质位于存储器702，处理器701读取存储器702中的信息，结合其硬件完成前述方法的步骤。
在示例性实施例中，桥臂电流的过流保护控制系统700可以被一个或多个应用专用集成电路(ASIC，Application Specific Integrated Circuit)、DSP、可编程逻辑器件(PLD，Programmable Logic Device)、复杂可编程逻辑器件(CPLD，Complex Programmable Logic Device)、现场可编程门阵列(FPGA，Field-Programmable Gate Array)、通用处理器、控制器、微控制器(MCU，Micro Controller Unit)、微处理器(Microprocessor)、或其他电子元件实现，用于执行前述方法。
本发明实施例还提供一种计算机可读存储介质，其上存储有计算机程序，该计算机程序被处理器运行时，执行：
获取桥臂电流；
对所述桥臂电流进行处理，得到电流有效值和电流瞬时值；
当所述电流有效值大于第一设定阈值，且所述电流瞬时值大于第二设定阈值时，对所述桥臂电流进行保护。
在一实施例中，所述计算机程序被处理器运行时，执行：
采集阀侧出口电流及直流母线电流；
基于所述阀侧出口电流及所述直流母线电流，获取桥臂电流。
在一实施例中，所述计算机程序被处理器运行时，执行：
对所述桥臂电流进行分解，得到直流分量和交流分量；
计算所述直流分量和所述交流分量的均方根，得到所述电流有效值。
在一实施例中，所述计算机程序被处理器运行时，执行：
基于所述直流母线电流和所述桥臂电流幅值，确定所述电流瞬时值。
在一实施例中，所述计算机程序被处理器运行时，执行：
利用如下公式获得所述直流分量，
利用如下公式获得所述交流分量，
其中，Ip(t)为电流瞬时值，A为常数。
以上给出了具体的实施方式，但本发明不局限于所描述的实施方式。本发明的基本思路在于柔性直流输电系统的桥臂电流过流保护方法，对于各实现步骤的具体实现手段并不做限定，在不脱离本发明的原理和精神的情况下对实施方式进行的变化、修改、替换和变型仍落入本发明的保护范围内。
本发明实施例提供的桥臂电流过流保护方法、控制系统及存储介质，获取桥臂电流；对所述桥臂电流进行处理，得到电流有效值和电流瞬时值；当所述电流有效值大于第一设定阈值，且所述电流瞬时值大于第二设定阈值时，对所述桥臂电流进行保护。该方案实现过程简单，所涉及
到的判断参量较少，保护可靠性较高，相应地，判断快速有效。在发生故障时，桥臂电流对各子模块的冲击大大减小，快速地保护子模块不受故障电流影响。
Claims (12)
- 一种桥臂电流的过流保护方法，包括：获取桥臂电流；对所述桥臂电流进行处理，得到电流有效值和电流瞬时值；当所述电流有效值大于第一设定阈值，且所述电流瞬时值大于第二设定阈值时，对所述桥臂电流进行保护。
- 根据权利要求1所述的方法，其中，所述获取桥臂电流，包括：采集阀侧出口电流及直流母线电流；基于所述阀侧出口电流及所述直流母线电流，获取桥臂电流。
- 根据权利要求1所述的方法，其中，所述对所述桥臂电流进行处理，包括：对所述桥臂电流进行分解，得到直流分量和交流分量；计算所述直流分量和所述交流分量的均方根，得到所述电流有效值。
- 根据权利要求2所述方法，其中，所述对所述桥臂电流进行处理，包括：基于所述直流母线电流和所述桥臂电流幅值，确定所述电流瞬时值。
- 根据权利要求3所述的方法，其中，所述对所述桥臂电流进行分解，得到直流分量和交流分量，包括：利用如下公式获得所述直流分量，
利用如下公式获得所述交流分量，
其中，Ip(t)为电流瞬时值，A为常数。 - 一种桥臂电流的过流保护控制系统，包括：采集模块，配置为获取桥臂电流；计算模块，配置为对所述桥臂电流进行处理，得到电流有效值和电流瞬时值；保护动作控制模块，配置为当所述电流有效值大于第一设定阈值，且所述电流瞬时值大于第二设定阈值时，对所述桥臂电流进行保护。
- 根据权利要求6所述的桥臂电流的过流保护控制系统，其中，所述采集模块，配置为采集阀侧出口电流及直流母线电流；基于所述阀侧出口电流及所述直流母线电流，获取桥臂电流。
- 根据权利要求6所述的桥臂电流的过流保护控制系统，其中，所述计算模块，配置为对所述桥臂电流进行分解，得到直流分量和交流分量；计算所述直流分量和所述交流分量的均方根，得到所述电流有效值。
- 根据权利要求7所述的柔性直流输电系统的桥臂电流过流保护控制系统，计算模块，配置为基于所述直流母线电流和所述桥臂电流幅值，确定所述电流瞬时值。
- 根据权利要求8所述的桥臂电流的过流保护控制系统，其中，所述计算模块还配置为通过如下公式获得所述直流分量，
并通过如下公式获得所述交流分量，
其中，Ip(t)为电流瞬时值，A为常数。 - 一种桥臂电流的过流保护控制系统，包括：存储器，配置为存储可执行程序；处理器，配置为通过执行所述存储器中存储的可执行程序时，实现权利要求1至5任一项所述的桥臂电流的过流保护方法。
- 一种存储介质，存储有可执行程序，所述可执行程序被处理器执行时，实现权利要求1至5任一项所述的桥臂电流的过流保护方法。
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| CN113824338B (zh) * | 2021-11-09 | 2024-03-12 | 哈尔滨工业大学（深圳） | 计算低压穿越时子模块非对称mmc桥臂电流的方法及装置 |
| CN115015724A (zh) * | 2022-05-11 | 2022-09-06 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | 损耗确定方法、装置、设备、存储介质和程序产品 |
| WO2025066077A1 (zh) * | 2023-09-27 | 2025-04-03 | 国网智能电网研究院有限公司 | 直流变压器故障保护方法、装置、计算机设备及存储介质 |
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