Online decision method for emergency control and correction control of ultrahigh voltage DC receiving-end grid

A UHV DC and receiving-end power grid technology, which is applied to AC network circuits, power transmission AC networks, circuit devices, etc., can solve problems such as frequency drop and transmission cross-section limit, and achieve the effect of improving efficiency and accuracy

Active Publication Date: 2018-09-28
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology

[0006] The purpose of the present invention is to provide an online decision-making method for emergency control and correction control of the UHVDC receiving-end power grid, which solves the safety and stability problems of

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  • Online decision method for emergency control and correction control of ultrahigh voltage DC receiving-end grid
  • Online decision method for emergency control and correction control of ultrahigh voltage DC receiving-end grid
  • Online decision method for emergency control and correction control of ultrahigh voltage DC receiving-end grid

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[0027] To make the objectives, technical solutions, and advantages of the implementation of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, but not all of the embodiments. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention, but should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[002...

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Abstract

The invention discloses an online decision method for emergency control and correction control of an ultrahigh voltage DC receiving-end grid. The method is characterized in that coordinate control measures include direct current emergency boosting control, pumped-storage pump switching control and accurate load control for a DC blocking fault of causing large power shortage of the ultrahigh voltage DC receiving-end grid; and the online decision method comprises the steps of before the fault, considering stability constraints of relevant AC sections according to a DC operating state, calculating the emergency boosting capacity, as shown in the specification, of DC power in real time, monitoring the operating conditions of various pumped-storage units, recording the total capacity, as shownin the specification, of switchable pumped-storage units, collecting interruptible load data and calculating the total amount, as shown in the specification, of interruptible loads; and after the fault, coordinating direct current emergency boosting control, pumped-storage pump switching control and accurate load control from two aspects of frequency emergency control decision and section overloadcorrection control decision.

Description

technical field [0001] The invention relates to the technical field of power system operation control, in particular to an online decision-making method for emergency control and correction control of an UHV DC receiving end power grid. Background technique [0002] With the increase of UHV AC-DC cross-regional transmission capacity, the coupling between AC-DC transmission and receiving-end power grids is becoming increasingly tight. Once a DC blocking fault occurs, the frequency of the power grid will drop rapidly, and the system may enter an emergency state. Complex faults may cause Large-scale power outages or stabilization accidents in the power grid. In addition, due to the strong DC and weak AC characteristics of the UHV AC-DC hybrid grid, single faults such as single DC, multi-DC blocking faults, and DC blocking faults caused by 500kV AC grid overload and low voltage levels have transformed into cascading faults and local disturbances The problem of extending to glob...

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Application Information

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IPC IPC(8): H02J3/36H02J3/24
CPCH02J3/24H02J3/36H02J2203/20Y02E60/60
Inventor 罗瑾龚雁峰袁宇波李虎成
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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