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An Emergency Control Method for Transient Security and Stability Considering Intelligent Controllable Equipment

A technology of transient safety and stability, safety and stability control, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve the problems of overly optimistic section limits, conservative section limits, and ignoring the interaction of intelligent controllable equipment, etc., to achieve The effect of avoiding under- or over-control risks

Active Publication Date: 2018-06-05
STATE GRID CORP OF CHINA +4
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  • Abstract
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Problems solved by technology

[0005] However, the current intelligent controllable equipment, especially TCSC, SVC and STATCOM, mainly rely on cross-sectional power or voltage level information collected locally or in the near area, and act according to the established strategy, without considering the interaction between intelligent controllable equipment. interaction with traditional machine-cutting and load-shedding control measures; moreover, in the actual system operation, intelligent controllable equipment also responds to frequent small disturbance events in the power grid, resulting in its dynamically adjustable response to severe faults. Capacity is often less than design capacity
The current off-line simulation analysis is still difficult to truly simulate this situation, resulting in the section limit of the off-line control strategy table being too conservative without considering the intelligent controllable equipment, and the emergency control measures are heavy; while considering the full capacity of the intelligent controllable equipment can be used During the transient process, the section limit is too optimistic and the emergency control measures are insufficient

Method used

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  • An Emergency Control Method for Transient Security and Stability Considering Intelligent Controllable Equipment
  • An Emergency Control Method for Transient Security and Stability Considering Intelligent Controllable Equipment
  • An Emergency Control Method for Transient Security and Stability Considering Intelligent Controllable Equipment

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Embodiment Construction

[0031] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0032] In one embodiment of the present invention, it is assumed that 3 sets of intelligent controllable equipment, TCSC, SVC and STATCOM, have been put into the power grid, and the maximum adjustable capacity of TCSC is C 1_max , the maximum adjustable capacity of SVC is C 2_max , the maximum adjustable capacity of STATCOM is C 3_max , the fault in the expected fault set is f, and the steps of its control method are as follows figure 1 shown.

[0033] Among them, step 1 is completed by offline simulation calculation, mainly including:

[0034] 1) Off-line simulation TCSC, SVC and STATCOM all exit the condition, the delivery limit P of the section when the fault f occurs lim_ori ;Input TCSC, SVC and STATCOM, re-simulate the fault f to get the section delivery limit P lim_new , and it is considered that the adjustment capacity ΔC released by ea...

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Abstract

The invention discloses a transient state safety and stability emergency control method considering an intelligent controllable device, belonging to the electric power system safety and stability control field. According to the invention, the main station of a safety and stability control system is provided with control sensitivity information of an intelligent controllable device; when the safety and stability control system is detected to break down, the method can calculate the comprehensive control effect which the intelligent controllable device actively participates in adjusting through the dynamic adjusting capacity difference sent by the intelligent controllable device before and after a fault, and accordingly correct an off line control strategy; after the control strategy is executed, and a time-delay determination system can not recover to a reasonable level, additional control measures are executed imminently.

Description

technical field [0001] The invention belongs to the technical field of electric power systems and automation thereof. More precisely, the invention relates to a transient safety and stability emergency control method considering intelligent controllable equipment. Background technique [0002] At present, the interconnection of regional power grids, UHV AC and DC, and long-distance large-capacity power transmission have basically taken shape. my country's power grid has become the world's largest power grid with the highest voltage level and the highest degree of complexity. Distributed power generation, large-scale new energy access, the rise of microgrids, and the commissioning of multiple large-capacity DC transmission systems have greatly increased the degree of nonlinearity of the system. With the rapid development of power electronics technology, the application of intelligent controllable equipment such as phase shifter (IPC), large-capacity high-voltage DC, controll...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 侯玉强李威宋晓芳薛峰吕亚洲彭慧敏袁虎玲周霞常海军李海峰罗凯明霍超牛拴保柯贤波
Owner STATE GRID CORP OF CHINA
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