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Generator and Load Regulating Control Method Based on Optimal Model

An optimization model and control method technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve problems such as difficult to apply to the dynamic change process of the power grid, and achieve the effect of eliminating chain trips

Active Publication Date: 2012-02-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Since the output change of the generator will often cause the change of the operating point of the system after the branch circuit cut event occurs in the power grid, it is difficult to apply the above static method to the dynamic change process of the power grid

Method used

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  • Generator and Load Regulating Control Method Based on Optimal Model
  • Generator and Load Regulating Control Method Based on Optimal Model
  • Generator and Load Regulating Control Method Based on Optimal Model

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specific Embodiment 1

[0029] Specific embodiment one, only adopt the control model of generator regulation:

[0030] Firstly, consider the mathematical model that only adjusts the output of the generator to reduce the power flow of the overloaded branch, and its objective function must be to minimize the total output of the adjusted generator. The objective function can be established as follows:

[0031] min Σ i = 1 n | Δ P i , G | - - - ( 5 - 15 )

[0032] In the formula, ΔP i，G Indicates the generator output change of node i, which is the current generator output P i，G0 and generator output P after taking control measures i，G The difference between:

[0033] ΔP i，G =P i...

specific Embodiment 2

[0053] Specific embodiment two, considering the control model of generator regulation and load shedding at the same time:

[0054] Since the adjustment ability of the generator output is limited by its adjustable capacity, when the branch circuit is seriously overloaded, if only the output adjustment of the generator is adopted, it may happen that the output adjustment of the generator has reached its limit value, but still cannot make all the power grids The branch runs in the safe range, and the optimal solution of the control model cannot be obtained at this time. Therefore, it is necessary to consider taking corresponding load shedding measures to reduce the branch current of the overloaded branch in the power grid, so that the system can operate within a safe range. Next, load shedding control is further introduced into the model.

[0055] In order to avoid load loss in the grid as much as possible, the objective function of the model is established as follows:

[0056]...

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Abstract

The invention discloses a generator and load regulation control method based on an optimal model. By establishing an objective function and a model, the power flow of an overloaded branch is reduced by adjusting generator output or generator regulation and load shedding control. Through the simplification method of the optimization model and the solution strategy process of the model, the purpose of greatly shortening the process of searching for the optimal solution is achieved. Combined with the online real-time measurement capability of WAMS, after each step of control measures is taken, the quantity measurement of WAMS is used as feedback information to form a closed-loop control method, which can reasonably ensure that the normal operation of the power grid can be restored under the control of cost and load loss, and the elimination of The purpose of branch circuit chain tripping caused by overload, and can be applied to the dynamic change process of the power grid after the event of branch circuit removal.

Description

technical field [0001] The invention relates to a grid failure control technology, in particular to a generator and load regulation control method based on an optimal model. Background technique [0002] As the power system has higher and higher requirements on the reliability of power supply, it is required that the load loss should be reduced as much as possible in the control of machine cut and load shed, reduce the flow of overloaded branches, and prevent chain trips. [0003] To solve the problem of chain tripping caused by power flow transfer, we should start from two aspects: the first is to study the rapid identification algorithm of power flow transfer after a single branch or multi-branch disconnection event occurs, to determine whether the branch overload is caused by branch It is caused by the power flow transfer caused by the power flow transfer. When the power flow transfer causes the overload, the trip signal of the backup protection is blocked in time to prev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
Inventor 毕天姝徐慧明薛安成杨奇逊
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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