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公开(公告)号：US10677219B2
公开(公告)日：2020-06-09
申请号：US15944225
申请日：2018-04-03
Applicant: ABB Technology Oy
Inventor： Peter Muszynski , Kalle Huju , Jussi Tamminen , Antti Vilhunen , Antti Virta
IPC: F03D7/00 , F03D7/02 , H02M5/458 , F03D9/25 , H02J3/38 , H02J3/46 , F03D7/04 , H02J3/18 , H02P101/15
Abstract: A method and a control system adapted to control a power conversion system connected to an AC power grid, wherein the control system is adapted to receive an externally provided reactive power reference and the control system includes a controller adapted to control the reactive power fed to the AC grid by the power conversion system and to produce a reactive current reference, an active current reference, a total current limiter for producing limited active and reactive current references. The total current limiter operates in reactive current priority limiting the active current reference. Further including means adapted to produce a capacity signal indicating the current capacity of the power conversion system. The control system further includes a minimum reactive power reference tracker adapted to generate an internally generated reactive power reference which is adapted to be fed to the controller adapted to control the reactive power fed by the power conversion system to the AC grid, where the minimum reactive power reference tracker is adapted to control the internally generated reactive power reference to a value with which the active current reference is not limited.
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公开(公告)号：US09298192B2
公开(公告)日：2016-03-29
申请号：US13887113
申请日：2013-05-03
Applicant: ABB TECHNOLOGY OY
Inventor： Jussi Tamminen , Jero Ahola , Tero Ahonen , Simo Hammo
CPC classification number: G05D7/0629 , F04D27/004 , F24F11/0001 , F24F11/77 , F24F13/02 , Y02B30/746
Abstract: A method includes selecting the branch of a ventilation system with the greatest pressure loss, opening a control valve in the selected branch and closing control valves in all other branches, controlling a fan to produce the desired air flow rate into the selected branch by using fan characteristic shaft power to air flow rate curves, and a shaft power estimate from the frequency converter and by adjusting the rotational speed of an electric motor to achieve the desired air flow rate, calculating the fan pressure corresponding to the desired air flow rate from fan characteristic fan pressure to air flow rate curves, saving the calculated fan pressure as a reference pressure, and adjusting the control valves in each of the remaining branches so that the desired air flow rate to each branch is delivered while the fan is controlled by the frequency converter to produce the reference pressure.
Abstract translation: 一种方法包括选择具有最大压力损失的通风系统的分支，打开所选分支中的控制阀并关闭所有其他分支中的关闭控制阀，控制风扇以通过使用风扇产生所选择的分支中的期望空气流量 特征轴功率对空气流量曲线，以及来自变频器的轴功率估计，并通过调节电动机的转速来实现所需的空气流量，从风扇特性计算对应于期望空气流量的风扇压力 风扇对空气流量曲线的压力，将计算的风扇压力保存为参考压力，并调整每个剩余支路中的控制阀，使得在风扇由变频器控制的同时传送到每个分支的期望空气流量 产生参考压力。
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公开(公告)号：US20180283351A1
公开(公告)日：2018-10-04
申请号：US15944225
申请日：2018-04-03
Applicant: ABB Technology Oy
Inventor： Peter Muszynski , Kalle Huju , Jussi Tamminen , Antti Vilhunen , Antti Virta
Abstract: A method and a control system adapted to control a power conversion system connected to an AC power grid, wherein the control system is adapted to receive an externally provided reactive power reference and the control system includes a controller adapted to control the reactive power fed to the AC grid by the power conversion system and to produce a reactive current reference, an active current reference, a total current limiter for producing limited active and reactive current references. The total current limiter operates in reactive current priority limiting the active current reference. Further including means adapted to produce a capacity signal indicating the current capacity of the power conversion system. The control system further includes a minimum reactive power reference tracker adapted to generate an internally generated reactive power reference which is adapted to be fed to the controller adapted to control the reactive power fed by the power conversion system to the AC grid, where the minimum reactive power reference tracker is adapted to control the internally generated reactive power reference to a value with which the active current reference is not limited.
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