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Method for analyzing coordination between direct-current restart scheme and weak receiving end system underfrequency load shedding

A low-cycle load shedding and receiving-end system technology, which is applied in the field of power systems, can solve problems such as the greater impact on the safety and stability of the receiving-end system, and achieve the effect of improving frequency stability

Active Publication Date: 2012-10-03
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

[0003] According to actual operating experience, the probability of DC single-stage blocking faults is relatively high, and DC blocking faults have a greater impact on the safety and stability of the receiving end system

Method used

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  • Method for analyzing coordination between direct-current restart scheme and weak receiving end system underfrequency load shedding
  • Method for analyzing coordination between direct-current restart scheme and weak receiving end system underfrequency load shedding

Examples

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example 1

[0024] Example 1: A receiving-end system is a weak AC power grid, and only receives power from the main grid through a DC return. Taking the receiving system as an example, the coordination between the DC restart scheme and the low-cycle load shedding of the receiving system is analyzed.

[0025] Such as figure 1 As shown, the analysis method is realized through the following steps:

[0026] Step 1: Take DC primary full-voltage restart as a candidate solution, and set the initial power receiving ratio to 30%.

[0027] Step 2: Carry out the time domain simulation calculation of the successful DC restart, the maximum system frequency drop is about 0.44Hz, and the low-cycle load shedding of the receiving end system does not operate.

[0028] Step 3: Carry out time-domain simulation calculations for DC restart failures and correct safety control actions. The maximum system frequency drops by about 1.44Hz, and the receiving end system performs low-cycle load shedding actions. Th...

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Abstract

The invention provides a method for analyzing the coordination between a direct-current restart scheme and weak receiving end system underfrequency load shedding. The method comprises the following steps of: (A) initializing the direct-current restart scheme; (B) setting an electric proportion of a receiving end system from a direct-current line for a current alternative scheme; (C) carrying out a time domain simulation calculation for direct-current restart; (D) carrying out the time domain simulation calculation for the failure of direct-current restart and the correct operation of safety control; and (E) outputting a feasible restart scheme under an original electric proportion if all alternative schemes are simulated completely, and outputting feasible electric proportion corresponding to other restart schemes; and if not, getting back to the step B. according to the method for analyzing the coordination between the direct-current restart scheme and the weak receiving end system underfrequency load shedding, provided by the invention, a direct-current power transmission proportion and the restart scheme are reasonably arranged, the frequency impact on the weak receiving end system due to a direct-current restart process can be effectively lowered, and the safe and reliable operation of the receiving end system is facilitated.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to an analysis method for coordination and cooperation between a DC restart scheme and a low-cycle load shedding of a weak receiver system. Background technique [0002] HVDC technology has the advantages of flexible power adjustment and no constraints on synchronous operation of the two-terminal system. On the one hand, it is widely used in long-distance and large-capacity power transmission occasions, and plays an important role in the national power grid interconnection; on the other hand, in It is also widely used in power transmission to small systems with weak AC grids. [0003] According to actual operating experience, the probability of DC single-stage blocking faults is relatively high, and DC blocking faults have a greater impact on the safety and stability of the receiving end system. The DC restart function is of great significance to ensure the safe and reliabl...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 刘明松孙华东罗煦之赵兵
Owner CHINA ELECTRIC POWER RES INST
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