Electrical power system real-time probabilistic load flow online computing method

A probabilistic power flow and power system technology, applied in the direction of calculation, electrical components, circuit devices, etc., can solve problems such as inaccurate calculation results, high hardware and software investment costs, and complicated calculation processes, so as to reduce economic losses and reduce equipment investment costs , the effect of improving computational efficiency

Inactive Publication Date: 2014-06-25
HARBIN INST OF TECH +3
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Problems solved by technology

[0008] The purpose of the present invention is to solve the technical defects such as inaccurate calculation results of the existing online calculation method of probability power flow, "dimension disaster" caused by a large number of network nodes in the actual scale power system, complicated calculation process, and excessive hardware and software investment costs. , providing a real-time probabilistic power flow online calculation method for power systems

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  • Electrical power system real-time probabilistic load flow online computing method
  • Electrical power system real-time probabilistic load flow online computing method
  • Electrical power system real-time probabilistic load flow online computing method

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specific Embodiment approach 1

[0021] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the real-time probabilistic power flow online calculation method of the power system described in this embodiment, the specific process of this method is:

[0022] Step 1. Establish a joint probability distribution model among the characteristic quantities of the load-side operation mode according to the next period prediction information of the characteristic quantities of the load-side operation mode;

[0023] Step 2. Obtain the joint probability distribution among the characteristic quantities of the load-side operation mode according to the joint probability distribution model obtained in the first step;

[0024] Step 3: Sampling the joint probability distribution between the characteristic quantities of the load-side operation mode obtained in Step 2 to obtain a sampling sample set;

[0025] Step 4. Establish a joint probability distribution model between the characteris...

specific Embodiment approach 2

[0027] Specific implementation mode 2: This implementation mode further explains the implementation mode 1. The specific process of establishing the joint probability distribution model between the characteristic quantities of the load-side operation mode in step 1 is as follows:

[0028] Divide a system with N load nodes into M regions, and the kth region contains n load nodes k , the relationship among the three levels of total system load, regional load and node load is:

[0029] P ( t ) = Σ k = 1 M P k ( t ) - - - ( 1 )

[0030] P k ( t ) = ...

specific Embodiment approach 3

[0044] Specific implementation mode 3: This implementation mode further explains the implementation mode 2. The specific process of obtaining the joint probability distribution between the characteristic quantities of the load-side operation mode in step 2 is as follows:

[0045] Step 21. Divide N load nodes in a system into M areas, and the number of load nodes in the kth area is n k , to obtain the load power P of the lth load node in each period t in the kth area kl (t),(k=1,2,…,M;l=1,2,…,n k );

[0046] Step 22: Calculate the total load power P(t) of the system in each time period t, the ratio vector R(t) of the load power of the M regions to the total load power of the whole system, and the n in the kth region k The ratio vector T of the load power of a load node to the total load power of the kth area k (t),(k=1,2,...,M):

[0047] P k ( t ) = Σ ...

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Abstract

The invention provides an electrical power system real-time probabilistic load flow online computing method, belongs to the technical field of power grid safety running under the large-scale wind, light and intermittent power supply connection backgrounds and aims at solving the problem that an existing probabilistic load flow online computing method is non-accurate in computing result and causes 'dimensionality curse' of a large number of network nodes of an actual electrical power system, complicated computing process, overlarge hardware and software investment cost and the like. The electrical power system real-time probabilistic load flow online computing method comprises the specific steps of establishing joint probability distribution models among load-side running mode characteristic quantities, obtaining joint probability distribution among the characteristic quantities and sampling the joint probability distribution to obtain a sample set; establishing the joint probability distribution models among intermittent power-supply-side running mode characteristic quantities, obtaining joint probability distribution and sampling the joint probability distribution to obtain a sample set; utilizing load flow high-dimensional models of key nodes and key lines to compute probabilistic load flow distribution and main distribution characteristics of a power grid in a next time period and obtaining a power grid running state. The electrical power system real-time probabilistic load flow online computing method is applied to an electrical power system.

Description

technical field [0001] The invention belongs to the technical field of power grid safe operation under the background of large-scale wind, light and other intermittent power supply access. Background technique [0002] Under the conditions that the external environment of the power system does not change much and the regularity of human production and life is relatively stable, the grid dispatching plans and operating status indicators on different operating days often show strong similarities. Scheduling schemes and control strategies with typical external characteristics (such as specific solar terms, holidays, and peak load periods) are summarized as an operation mode. Under certain specific external environments, a dispatch plan is formulated with reference to an operation mode similar to the external environment. The operation mode plays a vital role in ensuring the safe operation of the power grid, and generally requires a relatively strict safety check. In the tradit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06F19/00
Inventor 王松岩李碧君于继来徐泰山段炼刘强宋梦
Owner HARBIN INST OF TECH
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