An Analysis Method for Improving DC Power Receiving Capability for DC Weak Receiver Power Grid

A technology of power receiving capacity and analysis method, which is applied in the direction of AC network circuit, power transmission AC network, AC network voltage adjustment, etc., can solve the problems of untargeted and unconsidered influence of load power factor power receiving capacity, etc., and achieve the solution Reasonable, practical value, high practical value effect

Active Publication Date: 2020-12-15
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +2
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  • Description
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  • Application Information

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Problems solved by technology

These methods mainly focus on the influence of the steady-state distribution of active power on the DC power receiving capacity, and do not consider the influence of factors such as networked / isolated grid mode, load model, load power factor, reactive power compensation equipment operation mode, and DC control mode on the power receiving capacity. Influence, not very targeted

Method used

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  • An Analysis Method for Improving DC Power Receiving Capability for DC Weak Receiver Power Grid

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Embodiment 1

[0023] refer to figure 1 , a preferred embodiment of the present invention, an analysis method for improving the DC power receiving capacity of the DC weak receiving end power grid, the method includes the following steps:

[0024] Step 1: Use PSD-BPA software to establish a power grid simulation data model corresponding to the typical summer small mode of the research level year. In the mode, arrange the hydropower generation of the sending end grid, and the UHV DC meets the full delivery conditions;

[0025] Step 2: Comprehensively consider the short-circuit ratio of the DC weak receiving end feeding system, peak shaving capability, standby capacity, N-1 static safety, N-1 transient stability, severe fault transient stability, AC-DC channel coupling characteristics, The influence factors of load model, load power factor, reactive power compensation equipment operation mode and DC control mode give the DC access capability of the receiving end grid;

[0026] Step 3: Accordin...

Embodiment 2

[0039] Taking Jiangxi Power Grid as the research object power grid, establish a national power grid in the summer of 2022. Among them, Sichuan Power Grid will generate a lot of hydropower. In the typical small mode in Jiangxi in the summer of 2022, Jiangxi Power Grid starts up with an output of 7800MW, the total reactive power of generation is 3956MW, and the total load of the province is 15600MW. Connection line situation: 500kV of Hubei power grid sends about 6300MW to Jiangxi, UHV sends about -320MW to Jiangxi; Hunan power grid UHV sends Jiangxi to -90MW; The eastern part is about 1420MW; the power flow analysis shows that there is a 1000 / 500 / 220kV three-level electromagnetic ring network in the load center of Jiangxi Power Grid, and the area near the UHV DC inverter station is a weak area. By adjusting the start-up mode of Fengcheng Power Plant in Central Jiangxi Power Grid, the Alleviate the electromagnetic ring network problem.

[0040] Calculate Yazhong-Nanchang UHV DC...

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Abstract

The invention discloses an analysis method for improving DC power receiving capability of a DC weak receiving end power grid, and the method comprises the steps: firstly selecting a proper research mode for researching a target power grid, considering a plurality of impact factors, and calculating the DC power receiving capability; analyzing restrictive faults and influence factors of the power receiving capability, performing severity sorting on faults similar to the restrictive faults, analyzing fault characteristics, proposing corresponding measures for improving the power receiving capability, and performing adaptive simulation analysis to obtain an optimization scheme meeting operation requirements. By adopting the scheme provided by the invention, the power grid can be helped to improve the high-voltage DC power receiving capacity and the safe and stable operation level, the power supply tension situation of the receiving end power grid is relieved, economic benefits of sending-end power generation enterprises are helped to be improved, and high practical value is achieved.

Description

technical field [0001] The invention belongs to the field of electric power system scheduling automation, more precisely, relates to an analysis method for improving the DC power receiving capacity of a DC weak receiving end power grid. Background technique [0002] At present, many high-voltage and UHV DC transmission projects have been put into operation in China. The DC transmission capacity is not only closely related to the power receiving capacity of the AC evacuation channel of the power grid at the receiving end, but also related to the starting mode of the AC system, the distribution of active power and reactive power, etc. Limiting factors of power capacity and their solutions, studying how to adjust the distribution of active power and reactive power of the receiving-end power grid, under the condition of satisfying the constraints of the stability limit of the DC power evacuation section of the receiving-end power grid, so that HVDC can transmit more power, for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/46H02J3/50H02J3/16H02J3/18
CPCH02J3/16H02J3/1821H02J3/36H02J3/50H02J3/466H02J2203/20Y02E40/30Y02E60/60
Inventor 舒展李再华蔡霞郑超陈波吕思卓程思萌陶翔汪硕承
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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