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Unified per-unit calculation method for hybrid energy flow of electricity-water interconnection system

A technology of interconnected systems and calculation methods, applied in the field of energy flow calculation, can solve problems such as the system is prone to pathological conditions, the condition number of the composite Jacobian matrix is ​​too large, and the condition number of the Jacobian matrix is ​​too large

Pending Publication Date: 2021-03-19
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the pipeline coefficient of the pipeline equation in the hydraulic calculation of the water distribution network is too large, and the condition number of the Jacobian matrix will be too large in the process of solving it by the Newton-Raphson method. If the unified energy flow solution with the power grid is performed, it will dominate The condition number of the Jacobian matrix leads to an excessively large condition number of the composite Jacobian matrix, and the system is prone to ill-conditioning

Method used

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  • Unified per-unit calculation method for hybrid energy flow of electricity-water interconnection system
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  • Unified per-unit calculation method for hybrid energy flow of electricity-water interconnection system

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Effect test

Embodiment 1

[0125] see Figure 1 to Figure 3 , a unified per-unit calculation method for the mixed energy flow of the electricity-water interconnection system, including the following steps:

[0126] 1) Obtain the basic data of the electricity-water interconnection system and initialize it.

[0127] The electricity-water interconnection system includes the basic data of the power system, the basic data of the water distribution system, the parameters of the coupling link, the reference power of the electricity-water interconnection system, the reference value of the voltage of the power system, the reference value of the water head of the water distribution system, and the convergence accuracy of the Newton-Raphson method ε.

[0128] The basic data of the power system includes branch parameters, transformer parameters, generator parameters, load parameters and node types. The basic data of the water distribution system include water source parameters, water pipeline parameters, load nod...

Embodiment 2

[0239] The unified per-unit calculation method for the mixed energy flow of the electricity-water interconnection system includes the following steps:

[0240] 1) Input basic data and initialization

[0241] 1.1) Input the basic data, the input grid parameters include: branch parameters, transformer parameters, generator parameters, load parameters and node types; water distribution network parameters include: water source parameters, water pipeline parameters, load node parameters, load node types and storage Pool parameters; input coupling link parameters; set the reference power of the hybrid system, the reference value of the grid voltage and the reference value of the water head of the water distribution network; set the convergence accuracy ε of the Newton-Raphson method.

[0242] 1.2) Parameter initialization: Assume that there are N in the grid e nodes, the number of balance nodes is 1, and the number of PQ nodes is n e , the number of PV nodes is (Ne-n e -1). N in...

Embodiment 3

[0370] Such as Figure 7 As shown, taking the electricity-water interconnection system formed by the IEEE33-node distribution network and the 13-node water distribution network as an example, a calculation method for the mixed energy flow of the electricity-water interconnection system considering unified unit calculation is as follows:

[0371] 1) Input basic data and initialization

[0372] 1.1) Input the basic data, the input grid parameters include: branch parameters, transformer parameters, generator parameters, load parameters and node types; water distribution network parameters include: water source parameters, water pipeline parameters, load node parameters, load node types and storage Pool parameters; input coupling link parameters; set the reference power of the hybrid system, the reference value of the grid voltage and the reference value of the water head of the water distribution network; set the convergence accuracy ε of the Newton-Raphson method. The power gri...

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Abstract

The invention discloses a unified per-unit calculation method for hybrid energy flow of an electricity-water interconnection system. The method comprises the following steps of 1) acquiring basic dataof the electricity-water interconnection system and initializing the basic data; 2) establishing a power flow model of the power system; 3) establishing a steady-state model of the water distributionsystem; 4) establishing a coupling link steady-state model; 5) based on the power system power flow model, the water distribution system steady-state model and the coupling link steady-state model, establishing a unified per-unit electric-water interconnection system energy flow model; and 6) resolving the unified per-unit energy flow model of the electricity-water interconnection system by usinga Newton method to obtain electricity-water mixed energy flow. The invention provides a unified per-unit method of an electricity-water combined system in order to simplify system description and improve calculation efficiency aiming at the conditions of large numerical value difference and complex conversion relation in calculation of named values in a power grid and a water distribution network.

Description

technical field [0001] The invention relates to the field of energy flow calculation, in particular to a unified per-unit calculation method for mixed energy flow of an electricity-water interconnection system. Background technique [0002] Energy flow calculation, as the basic operation of the electricity-water interconnection system, is the basis for the planning and optimal operation of the electricity-water interconnection system. Previously, the coupling elements between the power grid and the water network were mainly water pumps, which increased the water head through the input of electric power from the power grid, thus ensuring the normal operation of the water network. At present, the bidirectional coupling of electricity-water systems has been considered in the literature. For example, based on the water consumption model of power generation equipment, the two-way flow of matter and energy in the electricity-water interconnection system can be realized. [0003] ...

Claims

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Application Information

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IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/10H02J2203/20
Inventor 赵霞谭红王骆孙名轶戴蓉
Owner CHONGQING UNIV
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