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公开(公告)号：US20210226449A1
公开(公告)日：2021-07-22
申请号：US17059879
申请日：2019-03-21
发明人： Yunlong Dong , Baoshun Zhang , Lei Pan , Ruhai Huang
摘要： Provided in the present application are a compensator, a control method and device therefor. The compensator comprises: a first inverter, comprising six branch circuits, the branch circuits comprising combined power units and reactors connected in series; the combined power units comprising: first power units and second power units connected in series or second power units connected in series; a first transformer, at least comprising a first side winding and a second side winding, the first side winding being connected to an alternating current-side interface of the first inverter, the second side winding being connected in series to a circuit of an alternating current system; the second side winding being connected in parallel on either end to a switch; and the switch, connected in parallel to the first transformer and then connected to the circuit of the alternating current system.
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公开(公告)号：US10461534B2
公开(公告)日：2019-10-29
申请号：US15501996
申请日：2015-08-04
发明人： Lei Pan , Jie Tian , Quanrong Shen , Xinbao Wang , Yu Lu , Yunlong Dong , Baoli Chang
摘要： A starting and stopping method for a static synchronous series compensator (SSSC) is provided. A starting process includes: connecting a converter to a shunt transformer, and closing a breaker which connect the AC system and the shunt transformer to charge the converter until the DC voltage is stable; opening the breaker, and connecting the converter to a series transformer through a change-over switch; and deblocking the converter, and controlling a current of a bypass switch of the series transformer to approach zero. A stopping process includes: switching a control mode of the converter to make the current of the bypass switch approaches zero when closed the bypass switch, then controlling a current of the series transformer to be gradually reduced to zero to make the series transformer out of service, and blocking the converter.
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公开(公告)号：US10396562B2
公开(公告)日：2019-08-27
申请号：US16319300
申请日：2017-08-15
发明人： Ruhai Huang , Yu Lu , Yunlong Dong , Lei Pan , Defeng Qiu , Chongxue Jiang , Jiang Lu , Gang Li , Zhaoqing Hu , Nannan Wang , Jiudong Ding , Ke Wang , Xianlai Hu , Hui Wang , Shunke Sui
摘要： A series compensation device suitable to double-circuit lines is disclosed. The device includes one series transformer and one converter. One converter and dual-circuit transmission lines are respectively connected to three windings of one series transformer. In the solution provided in the present application, the device can be independently installed in a power transmission system to be used as a static synchronous series compensator, and can also be used as a component of a unified power flow controller, a convertible static compensator, an interline power flow controller and a unified power quality conditioner to be connected to a power transmission system device in series. The device can save the capacity of a converter, improve the application efficiency of the series compensation device, and reduce the cost and area occupation.
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公开(公告)号：US11264794B2
公开(公告)日：2022-03-01
申请号：US16649113
申请日：2018-09-11
发明人： Lei Pan , Jie Tian , Dongming Cao , Yunlong Dong , Qiwen Zhou , Ruhai Huang , Fengfeng Ding
摘要： The present invention provides a series compensator and a control method. The series compensator includes a series transformer, a series transformer bypass device, a voltage source converter, a high-speed converter bypass device, a high-speed switch, and a reactor. The reactor and the high-speed switch are connected in parallel to form a current limiting module; one winding of the series transformer has two ends connected in series to a line, and the other winding thereof is sequentially connected to the current limiting module and the high-speed converter bypass device; the voltage source converter and the high-speed converter bypass device are connected in parallel; and at least one winding of the series transformer are connected in parallel to at least one series transformer bypass device. The series compensator of the present invention indirectly provides the current limiting module, so as to effectively limit the short-circuit current of a system, reduce the fault current to which the compensator is subjected, and improve the reliability of an alternating current system and the series compensator. Moreover, the current limiting module has a low voltage level, and the high-speed switch has a small breaking current, thereby providing good industrial applicability.
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公开(公告)号：US10965114B2
公开(公告)日：2021-03-30
申请号：US16617124
申请日：2018-05-22
发明人： Lei Pan , Jie Tian , Yunlong Dong , Yu Lu , Ruhai Huang , Chongxue Jiang , Jiang Lu , Baoshun Zhang , Defeng Qiu , Hua Xie
摘要： A method and apparatus for suppressing the impact of a compensator on line distance protection is provided, wherein the method comprises: obtaining a first current of a line connected to a compensator or series converters in the compensator, and a first voltage of a bus connected to the compensator or the line connected to the compensator; exiting the series converters and series transformers if the first current is greater than a preset current threshold and a duration is greater than a first preset time threshold; exiting the series converters and the series transformers if the first voltage is less than or equal to a preset voltage threshold and duration is greater than a second preset time threshold set the output voltage of the series converters to zero, and if a second current of an element corresponding to the first current meets conditions which the first current needs to meet; and otherwise, canceling the setting of the output voltage of the series converters to zero and obtaining a first current if a second voltage of the line corresponding to the first voltage is greater than the preset voltage threshold and the duration is greater than a third preset time threshold.
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公开(公告)号：US20170199502A1
公开(公告)日：2017-07-13
申请号：US15324744
申请日：2015-01-22
发明人： Jie Tian , Lei Pan , Chao Liu , Quanrong Shen , Haiying Li , Yu Lu , Yunlong Dong
摘要： A line power control method and system for a unified power flow controller includes outer loop line power control, inner loop valve side current control, and converter valve control. Series-side converter valve side current reference values Isedref and Iseqref are calculated by means of the outer loop line power control according to line power instructions Pref and Qref that are input, a measured line power UL, and measured line power Pline and Qline; a converter output voltage reference value Ucref is calculated by means of the inner valve side current control according to the valve side current reference values that are output by means of the outer loop power control, a measured valve side current, and a measured valve side voltage; and finally, a converter outputs, according to the voltage reference value, a corresponding voltage to control line power to achieve a reference value.
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公开(公告)号：US10033186B2
公开(公告)日：2018-07-24
申请号：US15311540
申请日：2015-01-12
发明人： Jie Tian , Haiying Li , Xinbao Wang , Yunlong Dong , Quanrong Shen , Lei Pan , Chao Liu , Baoli Chang
摘要： A unified power flow controller for a double-circuit transmission line comprises at least one parallel-connection transformer, three current converters, at least two series-connection transformers, a parallel-connection side switching circuit, a series-connection side switching circuit and a direct current common bus. The series-connection transformers connected with at least one group of by-pass switches in parallel. The three current converters connected to each loop line in series after being connected with at least one series-connection transformer through the series-connection side switching circuit. The three current converters connected to an alternating current system after connected with at least one parallel-connection transformer through a parallel-connection side switching circuit starting circuit. The three current converters are connected to the direct current common bus through a transfer switch.
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公开(公告)号：US10250070B2
公开(公告)日：2019-04-02
申请号：US15324744
申请日：2015-01-22
发明人： Jie Tian , Lei Pan , Chao Liu , Quanrong Shen , Haiying Li , Yu Lu , Yunlong Dong
摘要： A line power control method and system for a unified power flow controller includes outer loop line power control, inner loop valve side current control, and converter valve control. Series-side converter valve side current reference values Isedref and Iseqref are calculated by means of the outer loop line power control according to line power instructions Pref and Qref that are input, a measured line power UL, and measured line power Pline and Qline; a converter output voltage reference value Ucref is calculated by means of the inner valve side current control according to the valve side current reference values that are output by means of the outer loop power control, a measured valve side current, and a measured valve side voltage; and finally, a converter outputs, according to the voltage reference value, a corresponding voltage to control line power to achieve a reference value.
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公开(公告)号：US20170098936A1
公开(公告)日：2017-04-06
申请号：US15311540
申请日：2015-01-12
发明人： Jie Tian , Haiying Li , Xinbao Wang , Yunlong Dong , Quanrong Shen , Lei Pan , Chao Liu , Baoli Chang
CPC分类号： H02J3/14 , H02J3/16 , H02J3/1814 , H02J3/46 , Y02E40/18
摘要： A unified power flow controller for a double-circuit transmission line comprises at least one parallel-connection transformer, three current converters, at least two series-connection transformers, a parallel-connection side switching circuit, a series-connection side switching circuit and a direct current common bus. The series-connection transformers connected with at least one group of by-pass switches in parallel. The three current converters connected to each loop line in series after being connected with at least one series-connection transformer through the series-connection side switching circuit. The three current converters connected to an alternating current system after connected with at least one parallel-connection transformer through a parallel-connection side switching circuit starting circuit. The three current converters are connected to the direct current common bus through a transfer switch.
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