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
CN108599223AActive Publication Date: 2018-09-28NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Publication Date
2018-09-28

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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.
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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...

Claims

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