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Calculation method of maximum transmission capacity of VSC system based on continuous power flow

A technology for calculation of power transmission capacity and power transmission capacity, which is applied in the direction of AC network circuits, circuit devices, power transmission AC networks, etc., and can solve problems such as lack of research

Active Publication Date: 2019-04-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology

In terms of research objects, although the traditional DC system is considered in the existing transmission capacity calculation models, there is a lack of research on VSC-HVDC; and most of the existing transmission capacity calculation models are single-objective optimization models, which fail to comprehensively consider The Influence of System Safety and Economy on Transmission Capacity

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  • Calculation method of maximum transmission capacity of VSC system based on continuous power flow
  • Calculation method of maximum transmission capacity of VSC system based on continuous power flow
  • Calculation method of maximum transmission capacity of VSC system based on continuous power flow

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Embodiment Construction

[0020] The present invention will be described in detail below in conjunction with the accompanying drawings. Such as figure 1 As shown, the present invention proposes a method for calculating the maximum power transmission capacity of a VSC system based on continuous power flow, including the following steps:

[0021] Step A: Provide a multi-objective calculation model for the maximum transmission capacity of the VSC-HVDC AC and DC system.

[0022] Specifically, the proposed basic model for TTC calculation of AC and DC systems with VSC-HVDC is as follows:

[0023] 1 Objective function

[0024] 1.1 Maximum power transmission capacity

[0025]

[0026] In the formula, A: the set of load nodes of the regional power grid; P Li : active load of node i.

[0027] 1.2 Generator economic dispatch

[0028] Min∑F i (P Gi ) (2)

[0029] Among them, F i (P Gi ) is the power generation cost function of generator i.

[0030] 2 Constraints

[0031] 2.1 Equality constraints

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Abstract

The invention belongs to the field of dispatching automation of electric power systems, and particularly relates to a continuous power flow based maximum transmission capacity calculation method for a system containing a power source converter (VSC). The continuous power flow based maximum transmission capacity calculation method comprises the following steps: firstly establishing a multi-target maximum transmission capacity calculation model of an AC / DC system containing power source converter based high voltage direct current (VSC-HVDC); entering a predication link to solve a prediction equation based on the calculation model, then entering a correction link to solve a modified equation, entering a direction correction and parameter optimization link, and finally entering a safety verification ink to carry out static safety analysis so as to check voltage level and line heat stability; and simultaneously checking whether to reach a voltage collapse point. The static voltage stability, the static safety and the influence of system economy on transmission capacity can be taken into account comprehensively, so that the maximum transmission capacity calculation problem of the AC / DC system containing VSC-HVDC can be effectively solved, the electric generator economy output and VSC optimal control parameters are given out while the maximum transmission capacity is calculated, and the method has extremely good engineering application prospect.

Description

technical field [0001] The invention belongs to the field of power system scheduling automation, and in particular relates to a method for calculating the maximum power transmission capacity of a system containing a voltage source converter (VSC) based on continuous power flow. Background technique [0002] The gradual popularization and application of modern power electronic devices has increased the complexity of power system operation. How to improve the transmission capacity of the power grid on the basis of ensuring the safe, economical and reliable operation of the power grid, so as to meet the power load demand of each region as much as possible, has become Important and challenging research topic. In the electricity market environment, the maximum transmission capacity (TTC) is an important index that takes into account both system security and economy, and plays a guiding role in determining the transmission potential between regions. [0003] The calculation metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06H02J3/36H02J3/46
CPCH02J3/06H02J3/36H02J3/46H02J2203/20Y02E60/60
Inventor 陈艳波颛孙旭朱岸明邬捷龙于普瑶马进
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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