Method and system for new energy field station-level voltage closed-loop control
A voltage closed-loop, new energy technology, applied in wind power generation, AC network voltage adjustment, electrical components, etc., can solve the problems of deteriorating system voltage stability, unsuitable for fast voltage control, reactive power reversal, etc. The effect of improving the power support capacity and improving the short-circuit current capacity
Pending Publication Date: 2022-03-22
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology
When the power system voltage is disturbed or caused by a sudden voltage increase / decrease, the static var compensation device may cause reactive power reversal and deteriorate the voltage stability of the system. The static var compensation device is suitable for steady-state voltage regulation, but Not suitable for transient fast voltage control
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[0044] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not limiting of the present invention. In the figures, the same units / elements are given the same reference numerals.
[0045] Unless otherwise stated, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that the terms defined by commonly used dictionaries should be understood as having consistent meanings in the context of their related fields, and should not be understood as idealiz...
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The invention discloses a method and system for new energy field station-level voltage closed-loop control, and belongs to the technical field of power systems. The method comprises the following steps: measuring the grid-connected point voltage of the new energy station and the terminal voltage of a power generation unit in the new energy station, and reading the communication state of a new energy station controller and the power generation unit; judging whether the absolute value of the difference between the grid-connected point voltage of the new energy station and the given target voltage of the grid-connected point is greater than a voltage deviation dead zone; when the absolute value is larger than the voltage deviation dead zone, a reactive power control instruction is issued to a power generation unit; controlling the new energy station to enter a converter controller local level control mode according to the reactive power control instruction, obtaining Iqcmd ', and letting Iqcmd = Iqcmd'; and issuing the Iqcmd to a converter controller for adjustment. According to the invention, the transient reactive power support capability of the wind power plant is improved when the voltage transient sudden rise / sudden drop occurs at the wind power plant grid-connected point, and the short-circuit current capability of the wind power plant is improved at the same time.
Description
technical field [0001] The present invention relates to the technical field of power systems, and more specifically, to a method and system for closed-loop control of new energy station-level voltage. Background technique [0002] As of mid-2017, the installed capacity of wind power in my country reached 154 million kilowatts, and the installed capacity of photovoltaic power generation reached 102 million kilowatts, accounting for more than 13% of the country's installed power generation capacity. Among them, the new energy of 16 provincial power grids including Xinjiang, Qinghai, Ningxia, and Northern Hebei has become the second largest installed power source, and the installed capacity of new energy in four provinces including Xinjiang and Qinghai accounted for more than 30% of the total installed capacity of local power. It can be foreseen that in the near future some local power grids may have a proportion of new energy that reaches 80% or even higher, and the super-high...
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Login to View More IPC IPC(8): H02J3/50H02J3/40H02J3/12H02J3/38
CPCH02J3/50H02J3/40H02J3/12H02J3/381H02J2300/28Y02E10/76
Inventor 孙华东李文锋耿志晨张健艾东平魏巍王晖贾媛王小立
Owner CHINA ELECTRIC POWER RES INST