A quasi-steady-state energy flow analysis method for an electricity-water integrated energy system

A technology of integrated energy systems and analysis methods, applied in the field of quasi-steady-state energy flow analysis of electricity-water integrated energy systems, can solve the problems of slow water flow changes and difficulty in describing

Active Publication Date: 2022-07-15
CHONGQING UNIV
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Problems solved by technology

[0004] However, the existing research on power-water integrated energy systems is based on the steady-state analysis of the power system and water transmission and distribution system. It is believed that the water flow in the pipeline changes very slowly, so the hydraulic state of a point will not change with time. The time scale of the research is mostly on the hour scale
The above models are difficult to describe and analyze the impact of the transient process of the hydraulic system with a time scale of minutes or seconds on the power-hydraulic integrated energy system

Method used

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  • A quasi-steady-state energy flow analysis method for an electricity-water integrated energy system
  • A quasi-steady-state energy flow analysis method for an electricity-water integrated energy system
  • A quasi-steady-state energy flow analysis method for an electricity-water integrated energy system

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Embodiment 1

[0083] see Figure 1 to Figure 11 , a quasi-steady-state energy flow analysis method for an electricity-water integrated energy system, comprising the following steps:

[0084] 1) Obtain the network structure parameters of the Electric-Water Integrated Energy System (IEWS), and set the number of branch branch points to I, the pipeline segment step Δx, the time step Δt, and the simulation duration T. The segment nodes include upstream and downstream end nodes.

[0085] The pipeline segment step size Δx and the time step size Δt satisfy the following relationship:

[0086]

[0087] where c is the water hammer velocity.

[0088] 2) Obtain the initial steady-state energy flow of the electricity-water integrated energy system, that is, the energy flow distribution of the water distribution network and the power flow distribution of the distribution network at time t=0.

[0089] 3) Using the characteristic line method to calculate the transient energy flow and pump power of th...

Embodiment 2

[0149] An IEWS quasi-steady-state energy flow analysis method considering the transient characteristics of the water transmission and distribution system, the steps are as follows:

[0150] 1) Input the network structure parameters of IEWS, set the number of branch branch points to 3 (including upstream and downstream end nodes), take the water hammer wave velocity as 1000m / s, the pipeline segment step size as 1000m, and the simulation time step as 1s, The simulation time is 120s.

[0151] In order to ensure the accuracy of the solution, Δt and Δx must satisfy the time-space step relationship of the following Courant condition:

[0152]

[0153] 2) The energy flow distribution of the water distribution network and the power flow distribution of the distribution network when t=0 is input.

[0154] 3) Based on the known energy flow distribution of the water distribution network in the previous period, the characteristic line method is used to calculate the transient energy f...

Embodiment 3

[0203] see attached image 3 , using a test IEWS consisting of an IEEE-13 distribution network and an improved 5-node water distribution network to illustrate the effectiveness of the method proposed in Example 1, the steps are as follows:

[0204] 1) Obtain the distribution network data: the letters B and N represent the distribution network busbar and the water distribution network node respectively. The water pump of the water distribution network is connected to the busbar B8 of the distribution network. The detailed data of the water distribution network are shown in Table 1 and Table 2. :

[0205] Table 1 Water distribution network node data

[0206] Node ID Node type Elevation (m) Water load (m 3 / s)

N1 (water source) water source 0 - N2 end node 0 0 N3 end node 5 0.22 N4 end node 5 0.22 N5 end node 5 0.22

[0207] Table 2 Water distribution network branch data

[0208]

[0209] 2) Experiment:

[02...

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Abstract

The invention discloses a quasi-steady-state energy flow analysis method of an electric-water integrated energy system. The steps include: 1) obtaining network structure parameters of the electric-water integrated energy system; 2) obtaining the initial steady state of the electric-water integrated energy system Energy flow, that is, the energy flow distribution of the water distribution network and the power flow distribution of the distribution network at time t=0. 3) Use the characteristic line method to calculate the transient energy flow and pump power of the water distribution network in the next period; 4) Substitute the pump power of the next time step into the distribution network as the electrical load, and calculate the power of the next time step. Distribution network energy flow; 5) Save the energy flow calculation result, if the current time t is less than the total duration T, return to step 3), otherwise, output the distribution network energy flow. The invention comprehensively considers the transient characteristics of the water distribution network in the process of analyzing the energy flow of the electric-water integrated energy system, and can analyze the influence of the transient process of the hydraulic system with a time scale of minutes or seconds on the electric-water integrated energy system.

Description

technical field [0001] The invention relates to the technical field of integrated energy, in particular to a quasi-steady-state energy flow analysis method of an electricity-water integrated energy system. Background technique [0002] The increasingly severe energy and environmental crisis in the world has spawned the rapid development of new energy systems such as the Energy Internet and Integrated Energy System (IES). As the physical carrier of the energy Internet, the integrated energy system is an important development direction of the future energy system, with the basic characteristics of breaking the industry barriers of various heterogeneous energy systems, realizing the interconnection and comprehensive utilization of various energy sources. [0003] Although the power system and the water transmission and distribution system have long been in the mode of independent planning and separate operation, the two systems are closely related and interdependent, mainly bec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06Q50/06G06F113/04G06F113/14
CPCG06F30/20G06Q50/06G06F2113/04G06F2113/14
Inventor 赵霞孙名轶王骆谭红李欣怡
Owner CHONGQING UNIV
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