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A Disaster Recovery Response Method for Demand Side Frequency Emergency Control of Ultra-large Grid

A frequency emergency control, ultra-large-scale technology, applied in the direction of power network operating system integration, reduction/prevention of power oscillation, climate sustainability, etc., can solve problems such as poor disaster tolerance, high disaster tolerance, and large user impact range , to achieve the effect of strong disaster tolerance

Active Publication Date: 2022-08-09
SHANGHAI JIAO TONG UNIV +1
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  • Application Information

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Problems solved by technology

However, once this method malfunctions, it will lead to a large number of loads being disconnected by mistake, not only the user's influence range is huge, but also the system frequency will greatly exceed the rated value, resulting in a series of consequences. For the emergency control of demand-side frequency in ultra-large-scale power grids, the requirements for disaster tolerance are higher

Method used

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  • A Disaster Recovery Response Method for Demand Side Frequency Emergency Control of Ultra-large Grid
  • A Disaster Recovery Response Method for Demand Side Frequency Emergency Control of Ultra-large Grid
  • A Disaster Recovery Response Method for Demand Side Frequency Emergency Control of Ultra-large Grid

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Embodiment 1

[0052] Example 1, combining Figure 1-3 , take the 50Hz rated system frequency as an example to illustrate the real-time mode of the system.

[0053] The demand side frequency emergency control system communicates with the power generation side / grid side in real time, reports the controllable load information, delivers the necessary system parameters, and the smart socket monitors the frequency independently in real time.

[0054] The system parameters are:

[0055] According to this, the parameter values ​​in the time domain equation of the system frequency response model under the step input can be calculated:

[0056] ω n =0.559, φ 1 =131.94°

[0057] ω r =0.348,φ 2 =141.54°

[0058] α=6.011, φ=-9.60°

[0059] Assume that the system runs normally before the simulation time t=0s, and the frequency is f N =50Hz. At the moment of t=0s, the system suddenly encounters some kind of failure. Based on equations (1)-(2), the smart socket detects the initial falling...

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Abstract

The invention discloses a disaster-tolerant response method for emergency frequency control on the demand side of a super-large-scale power grid in the field of power systems, comprising the steps of: S1: an intelligent gateway predicts the lowest point of frequency drop based on obtained system parameters and a frequency curve monitored in real time; S2: If the intelligent gateway detects that the frequency is lower than the lower bound value when the frequency is normal, the intelligent gateway estimates the range of active power deficit and the lower bound of the lowest frequency point; S3: Based on the estimated value of the active power deficit and the lower bound of the lowest frequency point, calculate the conservative response value P C , remove the load; S4: The intelligent gateway continues to monitor the system frequency after the load is removed, and if the frequency exceeds the rated frequency of the system for 2s, it will immediately restore the erroneously removed load. The invention can avoid the frequency from contacting the low-frequency danger threshold by using the least demand-side load resources, and even in the case of a malfunction, it will not cause the frequency to greatly exceed the rated value, and the mechanism itself has a strong disaster tolerance capability.

Description

technical field [0001] The invention relates to the field of electric power systems, in particular to a disaster recovery response method for emergency frequency control on the demand side of an ultra-large-scale power grid. Background technique [0002] The existing technology for frequency emergency control using demand-side load resources is mainly to estimate the active power deficit as accurately as possible according to the system frequency, so as to remove the equivalent load and directly restore the rapidly falling fault frequency to the vicinity of the rated value. However, once the method malfunctions, it will cause a large number of loads to be cut off by mistake. Not only the user has a huge range of influence, but also the system frequency will greatly exceed the rated value, resulting in a series of consequences. This shows that this type of mechanism itself has poor disaster tolerance capability, especially For the emergency control of demand-side frequency in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
CPCH02J3/24Y04S20/222
Inventor 何光宇肖居承王治华陈宏福高峰何果红
Owner SHANGHAI JIAO TONG UNIV
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