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Method for evaluating the power transformation trusted capacity of generalized power supply in distribution network considering power supply mode

A technology of power supply mode and distribution network, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as lack of reliable capacity research, failure to consider high-voltage distribution network structure, and constant sufficiency of power generation system

Active Publication Date: 2019-01-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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AI Technical Summary

Problems solved by technology

[0004] (1) At present, most of the existing research is to investigate the effective capacity of intermittent energy to replace conventional generators at the level of large power grids. The same reliability means that the adequacy of the power generation system remains unchanged, and there is a lack of reliable capacity at the distribution network level. Research;
[0005] (2) At the distribution network level, within the power supply range of a substation, the research method of the variable capacity that distributed energy can replace is to use the capacity-load ratio as a reliability index. After the distributed energy is connected, the capacity-load ratio Under the same condition, the load that can be increased is defined as the credible capacity, and the credible capacity is deducted from the substation capacity; the disadvantage is that the scale of the substation in the same area will be different, which is not conducive to load transfer under failure , and does not consider the high voltage distribution network structure

Method used

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  • Method for evaluating the power transformation trusted capacity of generalized power supply in distribution network considering power supply mode
  • Method for evaluating the power transformation trusted capacity of generalized power supply in distribution network considering power supply mode
  • Method for evaluating the power transformation trusted capacity of generalized power supply in distribution network considering power supply mode

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Embodiment Construction

[0022] Step 1: Establish a generalized power output model, and set the distributed power model (wind power and photovoltaic), energy storage system model and controllable load model with independent control strategies. figure 2 It is a partial schematic diagram of a substation in the power supply area, indicating the position of GPS in the station;

[0023] (1) Distributed Power Modeling

[0024] The relationship between wind turbine output and wind speed is expressed as follows:

[0025] (1)

[0026] In the formula: v ci , v r , v co and P r are the cut-in wind speed, rated wind speed, cut-out wind speed and rated power of the wind turbine, respectively, f ( v ) is the wind speed at v ci and v co When between, the functional relationship between the wind speed of the wind turbine and the wind power;

[0027] The relationship between the active output of photovoltaic power generation system and the intensity of solar radiation:

[0028] (2)

[0029] I...

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Abstract

With the increasing permeability of a distributed power supply, energy storage and demand-side response resources, the distributed power supply can be used as a substitute for transformer capacity asa power supply in a distribution network to bear part of the load, and the distributed energy in the distribution network is collectively called a generalized power supply. Evaluating the capacity value of generalized generators instead of transformer capacity in the distribution network can provide important support for substation planning. The invention firstly proposes the definition of trustedcapacity of transformer, which refers to the equivalent transformer capacity of generalized power supply connected to the distribution network under the premise of satisfying the equal reliability principle under the condition of considering the faults of main transformer, 110 kV line, circuit breaker and other components at the level of high-voltage distribution network. And then take the distribution area as the object, At a certain value of that generalize power source permeability forecast in the plan level year, and based on the principle of equal reliability and the evaluation frameworkof sequential Monte Carlo, a method for evaluating the trusted capacity of the generalized power transformation of the distribution network considering the power supply mode is proposed, and the validity of the model and the method is verified by simulation.

Description

technical field [0001] The invention belongs to the field of distribution network substation capacity planning, and relates to an evaluation method for generalized power substation credible capacity under different wiring modes in the distribution network. Background technique [0002] With the increasing penetration of distributed power sources, energy storage and demand-side response resources, they can be used as power sources in the distribution network instead of variable capacity to bear part of the load. Therefore, the distributed energy sources in the distribution network are collectively referred to as generalized power sources. (Generalized Power Source, GPS); Evaluating the capacity value of the generalized power source instead of substation capacity in the distribution network can not only provide support for the substation planning in the active distribution network, thereby improving the utilization rate of power grid assets and equipment, but also effectively e...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 刘宗岐刘译聪郝永康刘文霞王佳伟郭静
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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