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1.发明公开
公开(公告)号：EP3681006A1
公开(公告)日：2020-07-15
申请号：EP18885604.1
申请日：2018-11-28
发明人： LU, Jiang , LU, Yu , DONG, Yunlong , WANG, Yongping , TIAN, Jie , WANG, Nannan , ZHAO, Wenqiang , HU, Zhaoqing , WANG, Ke , XIAO, Jianmin
IPC分类号： H02J3/36
摘要： Disclosed in the present invention is a voltage and current control method for a direct-current transmission system. The method comprises: calculating a DC voltage reference value of a voltage source converter of a DC voltage control end, on the basis whether a direct-current voltage end of a direct-current pole of a direct-current transmission system substantially controls a direct-current voltage; using 1/2 of the calculated direct-current voltage reference value of the voltage source converter as a bridge arm voltage direct-current bias, calculating a difference between the direct-current voltage reference value of the voltage source converter and a measured direct-current voltage value, and inputting the difference into a direct-current voltage control outer loop of the voltage source converter to perform closed-loop control, so as to control the direct-current voltage or the direct current of the direct-current pole. Correspondingly, also provided is a voltage and current control device for the direct-current transmission system. By the means of the present invention, the direct-current voltage and the direct current of the direct-current transmission system provided with the voltage source converter can be effectively controlled.
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公开(公告)号：EP3407455A1
公开(公告)日：2018-11-28
申请号：EP17762406.1
申请日：2017-01-19
发明人： ZHAO, Wenqiang , WANG, Nannan , WANG, Yongping , LU, Jiang , BAI, Chuanjun , LU, Yu
IPC分类号： H02J3/36
摘要： A method and apparatus for controlling a hybrid direct-current (DC) transmission system. The method comprises: adjusting the total number of inserted sub-modules of a modular multi-level converter and the polarity of an output level of the inserted sub-modules in real time, according to a DC voltage of a rectifier station at other end; or adjusting the total number of inserted sub-modules of a modular multi-level converter and the polarity of an output level of the inserted sub-modules in real time, according to the magnitude of a DC current or DC power; or adjusting the total number of inserted sub-modules of a modular multi-level converter and the polarity of an output level of the inserted sub-modules in real time, according to both the magnitude of the DC current and the DC voltage of the rectifier station at the other end. The method can effectively control the DC voltage and the direct current of a hybrid DC transmission system, avoiding the power transmitting breakdown.
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公开(公告)号：EP3136534A1
公开(公告)日：2017-03-01
申请号：EP15815487.2
申请日：2015-01-22
发明人： ZHAO, Wenqiang , LI, Lin , WANG, Yongping
IPC分类号： H02J3/36
摘要： The invention discloses a high voltage/ultrahigh voltage direct current transmission inverter side frequency control implementing method, comprising the following steps: transmitting a deviation between the inverter side power grid frequency and rated frequency to the inverter side frequency controller, wherein the frequency controller regulates and outputs a modulation quantity by adopting self-adaptive parameters according to different operation conditions; when the interstation communication is normal, the modulation quantity output of the inverter side frequency controller causes the rectifier side and the inverter side to form a new power/current order through the interstation communication, thus realizing the inverter side frequency control by changing the size of the transmission power; when the interstation communication is abnormal, converting the inverter side to current control from voltage control and converting the rectifier side to voltage control from current control; superposing the modulation quantity output of the inverter side frequency controller to the power/current order of the inverter side, changing the size of the transmission power to realizing the inverter side frequency control. The method realizes the fast efficient regulation function on the inverter side frequency, and effectively solves the problem of the inverter side frequency control for the interstation communication failure.
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4.发明公开HYBRID BACK-TO-BACK DC ELECTRIC POWER TRANSMISSION SYSTEM AND METHOD FOR CURRENT REVERSAL CONTROL 审中-公开混合式背对背直流电力传输系统和用于当前反向控制的方法
公开(公告)号：EP3293846A1
公开(公告)日：2018-03-14
申请号：EP17743641.7
申请日：2017-01-19
发明人： WANG, Nannan , ZHAO, Wenqiang , WANG, Yongping
CPC分类号： H02M5/4505 , H02H7/26 , H02J3/06 , H02J3/36 , H02M5/4585 , Y02E60/60
摘要： Disclosed in the present invention is a hybrid back-to-back direct current transmission system. The system comprises an LCC converter and a VSC converter in a back-to-back connection, and a first changeover switch, a second changeover switch, a third changeover switch and a fourth changeover switch. The first changeover switch is connected to a first alternating current system and the LCC converter; the second changeover switch is connected to the first alternating current system and the VSC converter; the third changeover switch is connected to a second alternating current system and the VSC converter; and the fourth changeover switch is connected to the second alternating current system and the LCC converter. In forward power delivery, the first changeover switch and the third changeover switch are closed; and in reverse power delivery, the second changeover switch and the fourth changeover switch are closed. Thereby, it is ensured that the VSC converter always performs inversion operation in any power direction, so as to avoid the problem of potential commutation failure for the LCC converter when being in inversion operation. Also provided is a fast power flow reversal control method of the hybrid back-to-back direct current transmission system.
摘要翻译： 本发明公开了一种混合背靠背直流输电系统。 该系统包括背靠背连接的LCC转换器和VSC转换器，以及第一转换开关，第二转换开关，第三转换开关和第四转换开关。 第一转换开关连接到第一交流电系统和LCC转换器; 第二转换开关连接到第一交流系统和VSC转换器; 第三转换开关连接到第二交流系统和VSC转换器; 并且第四转换开关连接到第二交流系统和LCC转换器。 在正向供电时，第一切换开关和第三切换开关闭合; 并且在反向动力输送中，第二转换开关和第四转换开关闭合。 从而保证VSC变换器始终在任意的功率方向进行逆变操作，以避免LCC变换器在逆变操作时潜在的换相失败问题。 还提供了混合式背靠背直流输电系统的快速潮流逆转控制方法。
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