摘要：【中文】本发明公开了一种受端多落点串联接入方式下的电压平衡控制方法及系统，包括：将置于受端落点的极控层控制策略下放至阀控层，实现阀组的独立控制；在代替受端低压阀组的电流控制器的基础上，增设新型的控制器与控制策略切换模块，并按照预设的切换规则进行配合调节，实现电压平衡控制。本发明的基于特高压直流输电原有的控制结构，对受端电压平衡控制的设置基于特高压直流输电时阀组的基本公式，可使特高压直流输电系统在受端多落点接入方式下稳定运行，以及在同极串联阀组电压不平衡时的调节；能够实现当受端以多落点形式接入后的稳定运行，又能够平衡同极阀组间在定电流控制策略下由于电流测量偏差引起的阀组电压偏差。 【EN】The invention discloses a voltage balance control method and a system under a receiving end multi-drop point series connection access mode, which comprises the following steps: a polar control layer control strategy arranged at a receiving end drop point is transferred to a valve control layer, so that the independent control of the valve group is realized; on the basis of replacing the current controller of the receiving-end low-voltage valve group, a novel controller and control strategy switching module is additionally arranged, and the voltage balance control is realized by matching and adjusting according to a preset switching rule. The invention is based on the original control structure of the extra-high voltage direct current transmission, the setting of the receiving end voltage balance control is based on the basic formula of the valve group during the extra-high voltage direct current transmission, so that the extra-high voltage direct current transmission system can stably operate in a receiving end multi-drop access mode and can be adjusted when the voltages of the homopolar series valve groups are unbalanced; the valve group voltage deviation caused by current measurement deviation under a constant current control strategy between homopolar valve groups can be balanced by realizing stable operation after receiving ends are connected in a multi-drop point mode.

摘要：【中文】本发明公开了一种基于站域信息确定故障线路的方法及系统，包括：根据采集的同塔混压双回线路中两条线路同一侧的三相电流和三相电压分别计算两条线路的零序电流、负序电流和零序电压；利用两条线路的零序电流、负序电流和零序电压按照预设的判断规则确定故障线路。本发明利用站域信息准确识别同塔混压双回输电线路的故障线路，改进了非故障线路方向元件的动作判据，能够正确切除故障线路；能够消除零序互感造成的零序方向元件误动作，提升了保护的可靠性，限制了事故范围扩大。 【EN】The invention discloses a method and a system for determining a fault line based on station domain information, wherein the method comprises the following steps: respectively calculating zero sequence current, negative sequence current and zero sequence voltage of two lines according to the collected three-phase current and three-phase voltage of the same side of the two lines in the same-tower mixed-voltage double-circuit line; and determining a fault line according to a preset judgment rule by using the zero sequence current, the negative sequence current and the zero sequence voltage of the two lines. The method accurately identifies the fault line of the same-tower mixed-voltage double-circuit power transmission line by using the station domain information, improves the action criterion of the non-fault line direction element, and can correctly cut the fault line; the false operation of the zero sequence directional element caused by zero sequence mutual inductance can be eliminated, the reliability of protection is improved, and the expansion of the accident range is limited.

摘要：【中文】本发明公开了一种用于换流站大扰动后自适应的下垂控制方法及系统，属于电力系统及其自动化技术领域。本发明方法，包括：获取多端柔性直流输电系统换流站系统参数，根据系统参数，确定换流站大扰动后进行自适应下垂控制的条件；当换流站大扰动后满足自适应下垂控制的条件时，根据系统参数，获取自适应下垂控制系数，根据自适应下垂控制系数对换流站进行下垂控制。本发明能够自适应调整下垂系数，避免传统下垂方法在大扰动下出现电压越限问题，同时，能够实现功率合理分配。 【EN】The invention discloses a self-adaptive droop control method and system used after large disturbance of a converter station, and belongs to the technical field of power systems and automation thereof. The method comprises the following steps: obtaining system parameters of a converter station of a multi-terminal flexible direct current transmission system, and determining conditions for carrying out self-adaptive droop control after large disturbance of the converter station according to the system parameters; and when the converter station meets the condition of the adaptive droop control after large disturbance, acquiring an adaptive droop control coefficient according to system parameters, and carrying out droop control on the converter station according to the adaptive droop control coefficient. The droop coefficient self-adaptive control method can self-adaptively adjust the droop coefficient, avoid the problem that the voltage exceeds the limit under large disturbance in the traditional droop method, and simultaneously realize reasonable power distribution.

摘要：【中文】本发明公开了抽能电抗器匝间保护控制方法及装置。该方法包括：获取抽能电抗器抽能绕组和主电抗绕组的电流采样值；在根据所述电流采样值确定预设的抽能电抗器匝间保护动作判据成立且预设的抽能电抗器匝间保护励磁涌流闭锁判据不成立时，控制抽能电抗器匝间保护动作；在根据所述电流采样值确定预设的抽能电抗器匝间保护动作判据以及预设的抽能电抗器匝间保护励磁涌流闭锁判据均成立时，控制抽能电抗器匝间保护闭锁。该方法，利用抽能侧零序电流的谐波特征构成励磁涌流闭锁判据，保证在发生区外故障时，抽能电抗器保护匝间不误动。 【EN】The invention discloses a method and a device for turn-to-turn protection control of an energy-pumping reactor. The method comprises the following steps: acquiring current sampling values of an energy-pumping winding and a main reactance winding of the energy-pumping reactor; when the fact that a preset turn-to-turn protection action criterion of the energy-extracting reactor is established and the fact that a preset turn-to-turn protection excitation inrush current locking criterion of the energy-extracting reactor is not established is determined according to the current sampling value, controlling turn-to-turn protection action of the energy-extracting reactor; and controlling turn-to-turn protection locking of the energy-extracting reactor when a preset turn-to-turn protection action criterion of the energy-extracting reactor and a preset turn-to-turn protection excitation inrush current locking criterion of the energy-extracting reactor are determined to be both established according to the current sampling value. According to the method, the harmonic characteristics of zero-sequence current at the energy extraction side are utilized to form excitation inrush current locking criteria, and the energy extraction reactor is guaranteed not to malfunction between turns when an external fault occurs.

摘要：【中文】本发明公开了一种抽能电抗器匝间故障的定位方法，包括：计算抽能电抗器各侧零序电流及零序电流突变量；当抽能电抗器短路时，计算抽能电抗器电流变化系数根据抽能电抗器电流变化系数及抽能电抗器各侧零序电流突变量，构成高低定值切换判据；利用抽能电抗器各侧零序电流及零序电流突变量构成抽能电抗器匝间保护判据；根据所述高低定值切换判据和电抗器匝间保护判据，确定抽能电抗器匝间故障位置，提高抽能电抗器保护的可靠性，保证抽能电抗器安全运行。 【EN】The invention discloses a method for positioning turn-to-turn faults of an energy extraction reactor, which comprises the following steps: calculating zero sequence current and zero sequence current break variables of each side of the energy-extracting reactor; when the energy-extracting reactor is in short circuit, calculating the current change coefficient of the energy-extracting reactor to form high and low constant value switching criterion according to the current change coefficient of the energy-extracting reactor and the sudden change of zero sequence current at each side of the energy-extracting reactor; forming turn-to-turn protection criterion of the energy-extracting reactor by using zero-sequence current and zero-sequence current mutation at each side of the energy-extracting reactor; and determining the turn-to-turn fault position of the energy-pumping reactor according to the high-low fixed value switching criterion and the reactor turn-to-turn protection criterion, improving the protection reliability of the energy-pumping reactor and ensuring the safe operation of the energy-pumping reactor.

摘要：【中文】本发明公开了一种基于断路器两端电压的直流断路器重合闸方法及系统，属于电力系统及其自动技术领域。本发明方法，包括：对直流输电系统进行故障检测，当确定当直流输电系统的直流断路器发生故障时，直流断路器关断且直流断路器的残余电流消失后，控制机械开关分闸；确定机械开关分闸后的预设时间后，故障的故障点是否游离结束，当确定瞬时性故障的故障点游离结束后，合上机械开关；对直流断路器两端的电压进行实时测量，若直流断路器两端电压持续衰减且低于直流输电系统的直流电压，则确定故障为瞬时性故障，对直流输电系统的直流断路器进行重合闸。本发明提高了流输电系统直流断路器重合闸的准确性和可靠性。 【EN】The invention discloses a reclosing method and a reclosing system of a direct current circuit breaker based on voltages at two ends of the circuit breaker, and belongs to the technical field of power systems and automation of the power systems. The method comprises the following steps: carrying out fault detection on the direct current transmission system, and controlling a mechanical switch to be switched off after the direct current breaker of the direct current transmission system is determined to be switched off and the residual current of the direct current breaker disappears when the direct current breaker of the direct current transmission system is determined to be in fault; after the preset time after the mechanical switch is switched off is determined, whether the fault point of the fault is dissociated is judged, and when the fault point of the transient fault is dissociated, the mechanical switch is switched on; and measuring the voltages at the two ends of the direct current breaker in real time, if the voltages at the two ends of the direct current breaker are attenuated continuously and are lower than the direct current voltage of the direct current transmission system, determining that the fault is an instantaneous fault, and reclosing the direct current breaker of the direct current transmission system. The invention improves the accuracy and reliability of the reclosing of the direct-current circuit breaker of the direct-current power transmission system.