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An Abnormal State Monitoring Analyzer for DC Converter Station

A DC converter station and abnormal state technology, applied in AC network circuits, power transmission AC networks, electrical components, etc., can solve problems such as large amount of calculation, rough DC model, small calculation step size, etc., and achieve the goal of preventing major faults Effect

Active Publication Date: 2020-09-29
HOHAI UNIV +2
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the existing simulation software mainly has two problems: on the one hand, the DC models of most of the existing commercial simulation software are very rough, and the quasi-steady-state model is used, which cannot well describe the abnormal operation of the DC station. The output power characteristics of the DC system, such as the built-in DC model in PSASP; on the other hand, today's more accurate simulation models are based on electromagnetic processes, taking into account the detailed switching characteristics of semiconductor devices and detailed controller models, which can More accurately describe the DC power under dynamic conditions, but its calculation step is small and the calculation amount is large, so it is not suitable for the simulation research of the electromechanical transient process of large power grids. For example, the DC model in the PSCAD simulation software is a detailed model

Method used

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  • An Abnormal State Monitoring Analyzer for DC Converter Station
  • An Abnormal State Monitoring Analyzer for DC Converter Station
  • An Abnormal State Monitoring Analyzer for DC Converter Station

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specific Embodiment approach

[0080] The specific implementation method is as follows: taking the simplified active power model determined under single-phase short-circuit fault as an example, it specifically includes the following steps:

[0081] Step 1: Acquisition of data:

[0082] The simulation data or real-time monitoring data are obtained in the electromagnetic transient simulation module. A single-phase short-circuit fault occurs at the commutation bus on the inverter side. The fault occurs in 0.65s and lasts for 0.08s. The grounding resistance is 5 ohms; the output active power is as follows: Figure 7 Shown by the dotted line.

[0083] Step 2: Given the initial value of the calibration parameter:

[0084] according to Figure 6 Flowchart, first put P limit The initial value is set to 0.3p.u., k p The initial value is set to 3.5p.u. / s The rate of active power recovery, t p Set to 0.15s, so far, the initial value of the parameters to be checked is set. P DC0 is the initial active power 1.0p....

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Abstract

The invention discloses an abnormal state monitoring analyzer for a DC converter station. The abnormal state monitoring analyzer comprises a real-time monitoring module, an electromagnetic transient state simulating module, an abnormal state model set module, a calling module, a man-machine interaction interface module and an accident inversion module. By processing active data and passive data under different fault types after phase changing of a DC system fails, a simplified power model is obtained, the accident inversion aim is achieved, and inversion result data is returned to the man-machine interaction interface module. By means of the abnormal state monitoring analyzer, whether the converter station is in an abnormal state or not can be monitored in real time and an alarm is given,a power model can be provided for power grid operation calculation in an offline mode, major breakdown is prevented, and certain guarantees are provided for safety and stability of an AC and DC powergrid.

Description

technical field [0001] The invention relates to an abnormal state monitoring analyzer for a DC converter station, belonging to the technical field of power system monitoring devices. Background technique [0002] High-voltage direct current transmission (HVDC) has the advantages of large transmission capacity, small transmission loss, and long transmission distance, which helps my country to realize the optimal allocation of energy resources, so it develops very rapidly. played an important role. However, after an abnormal state occurs, the output power of the DC converter station will fluctuate, which will have a serious impact on the AC power grid at the receiving end. [0003] Commutation failure is the most common abnormal operation state of the DC system. When the commutation failure occurs in the DC transmission system, the impact on the receiving end grid is mainly caused by the large changes in the active and reactive power output by the inverter station. However, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J13/00H02J3/36
CPCH02J3/36H02J13/00001H02J2203/20Y02E60/60
Inventor 鞠平赵健安军代飞吴峰陈军熊浩清杨阳余一平苏玮奕彭琰陈谦
Owner HOHAI UNIV
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