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A Fast Calculation Method for Expected Transient Response of HVDC Transmission System

A DC transmission system and transient response technology, applied in the direction of power transmission AC network, single-network parallel feeding arrangement, etc., can solve the problems such as the difficulty of realizing the complexity of the electromagnetic transient simulation algorithm, and achieve the effect of parallel computing

Active Publication Date: 2021-09-07
TSINGHUA UNIV +1
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Problems solved by technology

However, this transient response mechanism relies on the fast calculation of the expected transient response under the operating fault of the AC and DC system, and the high-precision fast calculation method is difficult to achieve due to the complexity of the electromagnetic transient simulation algorithm

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  • A Fast Calculation Method for Expected Transient Response of HVDC Transmission System
  • A Fast Calculation Method for Expected Transient Response of HVDC Transmission System
  • A Fast Calculation Method for Expected Transient Response of HVDC Transmission System

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Embodiment Construction

[0032] The present invention will be described in detail below with reference to the accompanying drawings.

[0033] A fast calculation method for the expected transient response of HVDC power transmission system, as shown in the attached figure 1 shown, including the following steps:

[0034] Step 1: Real-time monitoring of the bus voltage changes on the rectifier side and the inverter side of the DC transmission system. If any bus voltage change caused by a fault is detected, record the state variable x of the control system and the DC transmission system status , go to step 2;

[0035] Step 2: Using the classic AC system fault identification method, based on the state variable x of the control system and the DC transmission system status , to estimate K pairs of expected bus voltages on the rectifier side and the inverter side Then go to step 3;

[0036] Step 3: Match K to the desired bus voltage on the rectifier side and the inverter side with the state variable x ...

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Abstract

A method for quickly obtaining the expected transient response of a HVDC power transmission system, step 1: Real-time monitoring of the bus voltage changes on the rectifier side and the inverter side of the HVDC power transmission system, and recording the state variable x of the control system and the DC power transmission system status ; Step 2: Using the classic AC system fault identification method, based on the state variable x of the control system and the DC transmission system status ; Step 3: K pairs the expected bus voltage pair on the rectifier side and the inverter side with the state variable x status Input to the fast simulation model of HVDC transmission system based on dynamic phasor method for fast parallel simulation calculation, and obtain the expected transient response of K HVDC transmission. The expected transient response that has the greatest impact on transient stability is selected from the response; the invention can quickly calculate the transient response of the DC transmission system based on the measurement information after the AC disturbance occurs, and overcomes the shortcoming of the slow simulation speed of the DC transmission system.

Description

technical field [0001] The invention belongs to the technical field of power system simulation calculation, and in particular relates to a method for quickly obtaining the expected transient response of a high-voltage direct current transmission system. Background technique [0002] With the continuous innovation and development of my country's power grid technology, my country has formed the world's largest AC-DC hybrid power transmission system with the highest voltage level. LCC-HVDC (based on grid-commutated rectifier high-voltage direct current transmission) will constantly change the on-off state of the valve during operation, which introduces time-varying nature to the system, plus the multi-objective control and limiting output of the direct current transmission control system. A strong nonlinearity is introduced into the system, which brings many difficulties to the mechanism analysis and simulation calculation of the AC and DC systems. [0003] In order to improve...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/46
CPCH02J3/36H02J3/46Y02E60/60
Inventor 王宾李志中谢民董新洲王同文王海港俞斌
Owner TSINGHUA UNIV