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Generator and control method for load adjustment based on optimization 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: 2010-05-05
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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  • 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 control method for load adjustment based on optimization model
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  • Generator and control method for load adjustment based on optimization model

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specific Embodiment 1

[0030] Specific embodiment one, only adopt the control model of generator regulation:

[0031] First consider the mathematical model of reducing the power flow of the overloaded branch by only adjusting the output of the generator, and its objective function must be to minimize the total output of the adjusted generator. The objective function can be established as follows:

[0032] min Σ i = 1 n | Δ P i , G | - - - ( 5 - 15 )

[0033] 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:

[0034] ΔP i，G =P i，G0 -P i，G (5-16)

[0035] Si...

specific Embodiment 2

[0055] Specific embodiment two, considering the control model of generator regulation and load shedding at the same time:

[0056] 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.

[0057] In order to avoid load loss in the grid as much as possible, the objective function of the model is established as follows:

[0058]...

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Abstract

The invention discloses a generator and a control method for load adjustment based on an optimization model. By establishing an objective function and a model, an overloading branch power flow is reduced by adopting the mode of adjusting the output of the generator or the mode of adjusting the generator and controlling the load shed; and the purpose of greatly shortening the optimal solution process of the searching is achieved by a simplified method of the optimization model and the solving strategy flow of the model. Combined with the online real-time measurement ability of WAMS, after the control measure in each step is adopted, the quantity of the WAMS is measured as feedback information to form a closed loop control mode so that the normal operation of a grid can be reasonably ensured to recover under the condition of control cost and load loss so as to achieve the purpose of eliminating the inter-tripping of circuit branches caused by overloading, and can be suitable for the dynamic changeable process after a circuit branch cutting event occurs in the grid.

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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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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