公开(公告)号：US10003195B1

公开(公告)日：2018-06-19

申请号：US15425270

申请日：2017-02-06

Applicant: University of Macau

Inventor： Man-Chung Wong ,  Chi-Seng Lam ,  Lei Wang

IPC: H02J3/18 ,  H02J3/01 ,  H02M7/537

CPC classification number: H02J3/1842 ,  H02J3/1864 ,  Y02E40/12 ,  Y02E40/16 ,  Y02E40/22 ,  Y02E40/40

Abstract: A hybrid-STATCOM for providing compensating reactive power required by a load, the hybrid-STATCOM comprising: a TCLC part for each electric power phase, each TCLC part comprising: a coupling inductor; a power filter capacitor; and a thyristor-controlled reactor connected in series with a power filter inductor; and an active inverter part comprising: a voltage source inverter for each electric power phase; and a DC-link capacitor connected in parallel with the voltage source inverters. The control strategy of the hybrid-STATCOM is separated into two parts: TCLC part control and Active inverter part control. The TCLC part control is based on the instantaneous pq theory and aims to compensate the loading reactive power with the controllable TCLC part impedance. The active inverter part control is based on the instantaneous active and reactive current id-iq method and aims to improve the overall performance of the hybrid-STATCOM under different voltage and current conditions.

公开(公告)号：US20180152118A1

公开(公告)日：2018-05-31

申请号：US15884653

申请日：2018-01-31

Applicant: SMA Solar Technology AG

Inventor： Jens Friebe ,  Peter Lahnor ,  Oliver Prior

IPC: H02M7/5387 ,  H02M1/42 ,  H02J3/38 ,  H02M1/088 ,  H02M1/00

CPC classification number: H02M7/53871 ,  H02J3/1842 ,  H02J3/385 ,  H02M1/088 ,  H02M1/42 ,  H02M1/44 ,  H02M7/5387 ,  H02M2001/007 ,  Y02E40/22

Abstract: An unfolding bridge includes a half-bridge with a first input terminal, a second input terminal, and an output terminal, wherein the half-bridge includes a first bridge switch connected between the first input terminal and the output terminal and a second bridge switch connected between the second input terminal and the output terminal. The unfolding bridge also includes a further half-bridge which includes a first further bridge switch connected between the first input terminal and a further output terminal and a second further bridge switch connected between the second input terminal and the further output terminal. A switch controller for operation of the bridge switches is designed such that a connection of the output terminals with the input terminals via the bridge switches is reversed at a zero crossing of an alternating current flowing at the output terminals. In a current path between the input terminals via the first bridge switch, the output terminals, and the second further bridge switch, and in a current path between the input terminals, via the first further bridge switch (S5), the output terminals, and the second bridge switch, at least one reverse voltage compensator is arranged. The reverse voltage compensator is configured to shift the electrical potential of the respective input terminal with respect to the respective output terminal, between which the reverse voltage compensator is arranged, by a compensation voltage dropped across the reverse voltage compensator, and thereby compensates for a reverse voltage that is oriented against the flow of current in the current path in which the reverse voltage compensator is arranged.

公开(公告)号：US09906070B2

公开(公告)日：2018-02-27

申请号：US14946481

申请日：2015-11-19

Applicant: TABUCHI ELECTRIC CO., LTD.

Inventor： Hidehiko Sugimoto

IPC: H02J7/35 ,  H02J3/18 ,  H02J3/32

CPC classification number: H02J7/35 ,  H02J3/1842 ,  H02J3/32 ,  Y02E40/22

Abstract: The present system 1 includes a distributed power source 2, a storage battery 4, a bidirectional inverter 7 having a smoothing capacitor 6 on its DC side, and a control section 10 for controlling the entire system, and supplies AC power to a load 9 while being interconnected with a power system 8. When active power supplied from the distributed power source 2 and/or the storage battery 4 to the smoothing capacitor 6 is equal to or greater than active power of load power, the control section 10 controls a power factor of inverter output current outputted from the bidirectional inverter 7 so as to coincide with a power factor of load current flowing to the load 9.

公开(公告)号：US20180054065A1

公开(公告)日：2018-02-22

申请号：US15581748

申请日：2017-04-28

Applicant: SUNGROW POWER SUPPLY CO., LTD.

Inventor： Le YANG ,  Shineng YU ,  Jun XU

IPC: H02J3/38 ,  H02J3/18 ,  H02M7/5387

CPC classification number: H02M7/5387 ,  H02J3/18 ,  H02J3/1842 ,  H02J3/383 ,  H02J3/385 ,  Y02E10/58 ,  Y02E40/22

Abstract: Provided are a cascaded photovoltaic grid-connected inverter and a control method and control device thereof. The method includes: determining whether at least one of inverter units of the inverter is over-modulated; if yes, calculating a maximum reactive power and a minimum reactive power permitted to be injected to a power grid in a situation that a power factor of a system is not less than a minimum permitted value; simulating an operation state of the inverter after the maximum reactive power is injected to the power grid and determining whether each of the inverter units in the operation state is in a modulating region; if yes, injecting a suitable reactive power to the power grid; and if no, controlling the inverter to exit an operation mode of independently performing maximum power point tracking control on each photovoltaic panel.

公开(公告)号：US20180052478A1

公开(公告)日：2018-02-22

申请号：US15796555

申请日：2017-10-27

Applicant: Rajiv Kumar VARMA

Inventor： Rajiv Kumar VARMA

IPC: G05F1/66 ,  H02J3/38 ,  G05B19/042

CPC classification number: G05F1/66 ,  G05B19/0426 ,  G05B2219/40458 ,  G05B2219/50083 ,  H02J3/16 ,  H02J3/1842 ,  H02J3/381 ,  H02J3/383 ,  H02J3/386 ,  Y02E10/563 ,  Y02E10/763 ,  Y02E40/16 ,  Y02E40/22 ,  Y02E40/34

Abstract: The invention provides systems, methods, and devices relating to the provision of system-wide coordinated control voltage regulation support in power transmission and distribution networks using multiple inverter based power generation or absorption facilities, which are coupled to the power transmission and distribution networks for minimizing transmission and distribution line losses and for performing Conservation Voltage Reduction. The invention uses a novel control method of inverter based Distributed Generators as Static Synchronous Compensator (STATCOM) in a way that provides a dynamic voltage regulation/control with the inverter capacity remaining after real power generation or absorption, thereby decreasing system line losses and performing Conservation Voltage Reduction.

公开(公告)号：US20170256944A1

公开(公告)日：2017-09-07

申请号：US15474715

申请日：2017-03-30

Applicant: Shu Yuen Ron HUI ,  Chi Kwan LEE ,  Felix Fulih WU

Inventor： Shu Yuen Ron HUI ,  Chi Kwan LEE ,  Felix Fulih WU

IPC: H02J3/18 ,  H02J3/24

CPC classification number: H02J3/18 ,  H02J3/1814 ,  H02J3/1842 ,  H02J3/24 ,  Y02E40/18 ,  Y02E40/22 ,  Y02E40/30

Abstract: The present invention provides a power control circuit connectable to a load adapted to receive a power supply, the power control circuit adapted to absorb power from the power supply and adapted to deliver power to the power supply to stabilize at least one electrical parameter of the power supply. The present invention also provides an associated method of stabilizing at least one electrical parameter of a power supply connectable to a load, the method including absorbing power from the power supply or delivering power to the power supply. The at least one electrical parameter of the power supply includes parameters such as voltage and frequency.

公开(公告)号：US09728974B2

公开(公告)日：2017-08-08

申请号：US14050928

申请日：2013-10-10

Applicant: TMEIC Corporation

Inventor： Benjamin D. Rudolph ,  Paul S. Bixel

IPC: H02J1/10 ,  H02J3/38 ,  H02J3/50 ,  H02M1/42 ,  H02J3/16 ,  H02J3/18

CPC classification number: H02J3/50 ,  H02J3/16 ,  H02J3/18 ,  H02J3/1842 ,  H02J3/381 ,  H02M1/4233 ,  Y02B70/126 ,  Y02E40/22 ,  Y02E40/34 ,  Y10T307/549

Abstract: Methods, systems, controller devices, and computer program products for reactive power control at a renewable energy site are provided. Embodiments address dynamic performance problems associated with control loop delay and the changing modes of operation for meeting utility voltage and reactive power constraints. Provided is a method for reactive power control involving: (a) determining a site-wide reactive power command comprised by a sum of a reactive power feedforward or compensation term and an integrator term; and (b) distributing the site-wide reactive power command among inverters. Embodiments can include a reactive power control term based on the sum of a single integrator and reactive power compensation term, an integrator anti-windup mechanism based on the status of individual inverters, a means for decreasing detrimental effects of loop delay during reactive power reference changes, and/or a means of implementing voltage and power factor limits with smooth transfer between reactive power operating regions.

公开(公告)号：US20170040887A1

公开(公告)日：2017-02-09

申请号：US15227544

申请日：2016-08-03

Applicant: ABB Schweiz AG

Inventor： Andrea Becattini ,  Sauro Macerini

IPC: H02M1/42 ,  G01R21/133 ,  H02J3/16 ,  G01R21/00 ,  H02J7/00 ,  H02J3/38

CPC classification number: H02M1/42 ,  G01R21/003 ,  G01R21/1331 ,  H02J3/16 ,  H02J3/1842 ,  H02J3/32 ,  H02J3/382 ,  H02J3/383 ,  H02J3/385 ,  H02J3/50 ,  H02J7/0068 ,  H02M2001/0009 ,  Y02E10/58 ,  Y02E40/22

Abstract: DC/AC converter apparatus, for converting DC power of a DC energy source into AC power for supplying a load and or the utility grid, adapted to automatically control the amount of both active and reactive electrical power that is exchanged with the utility grid in order to optimize the electrical power usage of the micro grid.

Abstract translation: DC / AC转换器装置，用于将直流能源的直流电力转换成用于提供负载的电力和/或公用电网，其适于自动控制与公用电网交换的有功和无功电力的数量 以优化微电网的电力使用。

公开(公告)号：US20170012427A1

公开(公告)日：2017-01-12

申请号：US15209387

申请日：2016-07-13

Applicant: Electronic Power Design, Inc.

Inventor： Charles Sutherland ,  John Bradford Janik

IPC: H02J3/01

CPC classification number: H02J3/01 ,  H02J3/1842 ,  H02J3/185 ,  H02J4/00 ,  Y02E40/22 ,  Y02E40/24

Abstract: A computer program product and system are disclosed including but not limited to supplying a voltage waveform from a higher power electrical bus to a lower power electrical bus; sensing on the lower power electrical bus, a deviation from a sinusoidal voltage waveform in the voltage waveform supplied from the higher power electrical bus; generating a correction current to adjust the deviation in the voltage on the lower power bus to a substantially sinusoidal voltage waveform; and filtering the correction current to substantially attenuate the correction current from propagating through the filter from the lower power electrical bus to the higher power electrical bus.

Abstract translation: 公开了一种计算机程序产品和系统，包括但不限于将电力波形从较高功率的电气总线提供给较低功率的电气总线; 在较低功率电气总线上感测到与从较高功率电力总线提供的电压波形中的正弦电压波形的偏差; 产生校正电流以将低功率总线上的电压的偏差调整到基本上正弦的电压波形; 并且对所述校正电流进行滤波以使所述校正电流从所述低功率电气总线传播到所述较高功率电气总线，从而传播通过所述滤波器。

公开(公告)号：US20160294187A1

公开(公告)日：2016-10-06

申请号：US15038714

申请日：2014-06-24

Applicant: STATE GRID CORPORATION OF CHINA ,  STATE GRID HEBEI ELECTRIC POWER RESEARCH INSTITUTE ,  HEBEI ELECTRIC POWER COMMISSIONING INSTITUTE

Inventor： Zhiqiang Gao ,  Liang Meng ,  Wenping Hu ,  Wenxin Wang ,  Hui Fan ,  Hao Jing ,  Bin Liang

IPC: H02J3/01 ,  H02M7/04 ,  H02M7/44 ,  H02M1/12

CPC classification number: H02J3/01 ,  H02J3/32 ,  H02J3/381 ,  H02M1/12 ,  H02M7/04 ,  H02M7/44 ,  Y02E40/22 ,  Y02P80/14 ,  Y02P80/152

Abstract: A system for staring a large-scale power load in a micro grid comprises a PCC grid connection switch, a micro grid alternating-current bus, an active power filter (APF), an energy storage inverter, an energy storage battery, a current-limiting resistor R, contactors K1-K3, a time relay KT, a power supply relay board, a micro grid maser control system, a frequency converter rectifying circuit, a frequency converter filter circuit, and a frequency converter inverter circuit. There are the advantages: an output torque of a power load can be effectively improved by using a variable frequency starting apparatus, and a starting current is also small; the provided method can effectively reduce a harmonic current when a variable frequency starting apparatus starts a power load, the phenomenon that two power sources supply power on a direct-current side of the variable frequency starting apparatus at the same time is avoided, thereby improving the stability and the economy of a micro grid.

Abstract translation: 用于在微电网中凝视大规模电力负载的系统包括PCC电网连接开关，微电网交流总线，有功功率滤波器（APF），能量存储逆变器，能量蓄电池， 限流电阻R，接触器K1-K3，时间继电器KT，电源继电器板，微电网控制系统，变频整流电路，变频器滤波电路和变频器逆变电路。 具有以下优点：通过使用可变频启动装置可以有效地提高功率负载的输出转矩，起动电流也较小; 所提供的方法可以有效地降低可变频率启动装置开始电力负载时的谐波电流，避免了两个电源同时向变频启动装置的直流侧供电的现象，从而改善了 稳定和微电网的经济。