A sufficiency assessment method for wind-storage hybrid power system

A technology of hybrid power system and adequacy, applied in the field of electric power, can solve the problems that the adequacy index is not scientific enough, cannot fully reflect the actual operation of the system, and fails to take into account the situation of energy storage batteries connected to the system, etc., to achieve adequacy Metric Science Effects

Inactive Publication Date: 2017-08-01
HOHAI UNIV +2
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  • Application Information

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Problems solved by technology

[0003] At present, probabilistic methods are often used to evaluate the adequacy of the power system, such as calculating the loss of load probability LOLP, loss of load expectation and other indicators to measure the adequacy of the system, but these indicators only measure the adequacy of the system in a risky state, which is not comprehensive and cannot be completely It reflects the actual operation of the system, so the adequacy index is not scientific enough, and the existing method fails to take into account the situation of the energy storage battery connected to the system

Method used

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  • A sufficiency assessment method for wind-storage hybrid power system
  • A sufficiency assessment method for wind-storage hybrid power system
  • A sufficiency assessment method for wind-storage hybrid power system

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Embodiment 1

[0026] figure 1 is a schematic flow chart of an embodiment of the wind-storage hybrid power system adequacy assessment method provided by the present invention, such as figure 1 shown, including steps:

[0027] Step 1: Obtain system data including the number of generators and rated power, energy capacity and power capacity of energy storage batteries, network structure and parameters, and set the number of simulation years.

[0028] Among them, the simulation system adopts the RRBTS6 system, such as figure 2 shown. The wind speed data used in the simulation is obtained from the measured data of the wind farm, and the two-parameter Weibull distribution scale parameter c=7.3273 and shape parameter k=2.1220 can be obtained by fitting. The single-unit capacity of the wind turbine is 2MW, the cut-in, rated and cut-out wind speeds are 3m / s, 12m / s and 22m / s respectively, and the number of connected wind turbines is set to increase to 60 (120MW) in steps of 10 (20MW) ) units, the...

Embodiment 2

[0068] This method is used to evaluate the adequacy of the conventional power system without wind power and energy storage batteries. This method can be used to study the adequacy of the power generation and transmission system, and distinguish between the boundary state and the healthy state according to whether the generation capacity is greater than 10% of the total load . On the basis of the existing RBTS6 node system, the simulation system adds a branch 10 with the same parameters as branch 9 between nodes 5 and 6. The modified system is called the RRBTS6 system, see image 3 . The rated voltage of the system is 220kV, and the system contains 11 generators, 5 bus loads and 10 transmission lines. The peak load of the system is 185MW, and the generating power of conventional units is 240MW.

[0069] Step 1: Read in the RRBTS6 node system data, and the number of sequential Monte Carlo simulations is 200 years.

[0070] Step 2: Consider the forced outage rate of generator ...

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Abstract

The invention discloses an evaluation method for adequacy of a wind generation and energy storage hybrid power system. According to the evaluation method, a deterministic criterion and a probability method are combined on the basis of a Well-being theory, the running state of the system is divided into a healthy state, a boundary state and a risk state by adopting a deterministic method, and then, the probability method is adopted to evaluate the adequacy of the system. The division of the system state is realized under the consideration of the adequacy of a power generation system and the adequacy of a power transmission system, so that the calculated adequacy indexes under the various states are more scientific, and can reflect the running condition of the actual system better.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for assessing the adequacy of a wind-storage hybrid power system. Background technique [0002] The grid connection of wind power increases the cost of adequate control of the system. The energy storage system can quickly and accurately control the power output, and plays an important role in the instantaneous adequacy control of the power system. [0003] At present, probabilistic methods are often used to evaluate the adequacy of the power system, such as calculating the loss of load probability LOLP, loss of load expectation and other indicators to measure the adequacy of the system, but these indicators only measure the adequacy of the system in a risky state, which is not comprehensive and cannot be completely It reflects the actual operation of the system, so the adequacy index is not scientific enough, and the existing method fails to take into account th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/38H02J3/28
Inventor 潘学萍孙彬吴峰李海峰罗凯明
Owner HOHAI UNIV
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