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Optimal external power receiving proportional algorithm for ultra-high voltage accessing to power grid

An external power receiving and ultra-high voltage technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve problems such as voltage collapse, reactive power, deterioration of voltage support trend, and weakened power grid balance ability

Inactive Publication Date: 2018-11-23
RES INST OF ECONOMICS & TECH STATE GRID SHANDONG ELECTRIC POWER +2
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] In recent years, the development of power supply in some areas has been limited by various conditions, and it is difficult to meet the rapid growth of load, resulting in an increase in the proportion of external power to the total power supply load year by year.
In the existing technology, when the proportion of external power receiving is too high, the external power supply is too concentrated, and frequency stability problems are prone to occur; when the power grid lacks sufficient voltage support, the self-balancing ability of the power grid will be weakened, and the trend of reactive power and voltage support will deteriorate. which in turn may cause a voltage collapse

Method used

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  • Optimal external power receiving proportional algorithm for ultra-high voltage accessing to power grid

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Embodiment Construction

[0044] Such as figure 1 As shown in Fig. 1, an algorithm for the optimal ratio of external power receiving to the UHV network, including the optimal power flow objective function and the optimal power flow constraint conditions, specifically includes the following steps:

[0045] 1) Determine the optimal power flow objective function.

[0046] The optimal power flow objective function is:

[0047]

[0048] In the formula, SG is the set of all units; f(P Gi ) = a i P 2 Gi +b i P Gi +c i , ai, bi and ci are the consumption coefficients of the unit Gi; PGi is the active power generated by the unit Gi.

[0049] 2) Determine the active power balance constraint in the constraints.

[0050] The active power balance constraint formula is:

[0051]

[0052] In the formula, n is the total number of nodes of the receiving end grid; P Li is the load active power of node i; U i and θ i are the voltage amplitude and phase angle of node i respectively; θ ij = θ i -θ j ;...

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Abstract

The invention discloses an optimal external power receiving proportional algorithm for an ultra-high voltage accessing to a power grid and belongs to the technical field of power grid distribution. The algorithm comprises the following steps of: 1) determining an optimal power flow objective function; 2) determining an active balance constraint in a constraint condition; 3) determining a reactivebalance constraint in the constraint condition; 4) determining an output constraint of the active power in the constraint condition; 5) determining the output constraint of the reactive power in the constraint condition; 6) determining a voltage constraint in the constraint condition; 7) performing 'N-1' verification for a feasible solution of the optimal power flow; 8) performing transient stability check for the feasible solution of the optimal power flow; and 9) obtaining the optimal proportion of the electrical power capacity and the external electric capacity of a receiving-end power grid. According to the optimal external power receiving proportional algorithm for the ultra-high voltage accessing to the power grid, the problem of unstable external power proportion is solved, and thesafe and stable operation and power supply demands of the power grid are guaranteed by searching the optimal proportion and the optimal balance point of the external power accessing to the power grid,so that the comprehensive index is optimized.

Description

technical field [0001] The invention relates to an optimal external power receiving ratio algorithm for ultra-high voltage network access, and belongs to the technical field of power grid distribution. Background technique [0002] In recent years, the development of power supply in some areas has been limited by various conditions, and it is difficult to meet the rapid growth of load, resulting in an increase in the proportion of external power to the total power supply load year by year. In the existing technology, when the proportion of external power receiving is too high, the external power supply is too concentrated, and frequency stability problems are prone to occur; when the power grid lacks sufficient voltage support, the self-balancing ability of the power grid will be weakened, and the trend of reactive power and voltage support will deteriorate. This in turn may cause a voltage collapse. [0003] Aiming at the above existing technical conditions, the applicant ...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 田鑫李雪亮赵龙吴健牟宏高效海孙东磊高晓楠程剑汪湲付一木魏鑫魏佳张佳宁王男
Owner RES INST OF ECONOMICS & TECH STATE GRID SHANDONG ELECTRIC POWER
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