Voltage source converter-comprising alternating current and direct current series-parallel power grid reactive optimization method

A voltage source converter, AC-DC hybrid technology, applied in the direction of power transmission AC network, reactive power compensation, reactive power adjustment/elimination/compensation, etc., to achieve good control effect

Inactive Publication Date: 2018-02-23
STATE GRID FUJIAN ELECTRIC POWER CO LTD +1
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Problems solved by technology

So far, there is no report on the closed-loop real-time control of active or reactive voltage of VSC-HVDC system

Method used

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  • Voltage source converter-comprising alternating current and direct current series-parallel power grid reactive optimization method
  • Voltage source converter-comprising alternating current and direct current series-parallel power grid reactive optimization method
  • Voltage source converter-comprising alternating current and direct current series-parallel power grid reactive optimization method

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Embodiment Construction

[0053] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0054] The voltage source converter is the key equipment of the multi-terminal flexible DC transmission system and the link between the DC system and the AC system. One side of each VSC is connected to the DC network, and the other side is connected to the AC network, which is a bridge for power exchange between the DC network and the AC network.

[0055] (1) Establishing the reactive power model of the flexible DC transmission system, the flexible DC transmission system includes voltage source converters and DC lines, such as figure 1 shown.

[0056] For the kth VSC in the power grid, denoted as VSCk, the relevant physical quantities and their reference directions are as follows figure 2 As shown, the actual voltage source converter is mapped into three parts: equivalent impedance, variable resistor and ideal voltage source conver...

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Abstract

The invention discloses a voltage source converter-comprising alternating current and direct current series-parallel power grid reactive optimization method, and belongs to the field of optimization and dispatching of an electric power system. At current, reactive regulation after flexible direct current power transmission is introduced is not taken into consideration in an AVC strategy, and an effective active and reactive closed loop control method for the voltage source converter is absent. The reactive optimization method comprises the steps of establishing a flexible direct current powertransmission system reaction model; establishing a reactive optimization constraint condition of the flexible direct current power transmission system, and a target function, obtaining a reactive optimization model, and solving the reactive optimization model according to the set constraint condition; and specific to the established reactive optimization model, solving the target function by adopting a branch and bound method in combination of a prime-dual interior point method. By virtue of the technical scheme, the flexible direct current convertor station reactive model is established, andthe targeted reactive control method is designed, so that the reactive adjustment capability of the voltage source converter is utilized fully, the voltage control capability in the alternating current and direct current power grid series-parallel condition is improved, and network loss is lowered.

Description

technical field [0001] The invention belongs to the field of power system optimization dispatching, and relates to a method for optimizing reactive power of an AC / DC hybrid power grid including a voltage source converter. Background technique [0002] Voltage quality is an important indicator of power quality, which has an important impact on the safe and economical operation of the power system, on ensuring the safe production and product quality of users, and the safety and life of electrical equipment. Excessive voltage fluctuations may even cause the voltage collapse of the power system, resulting in a large-scale blackout, which will have a major impact on the power system and the political economy of the entire society. The reactive power compensation and reactive power balance of the power system are the basic conditions to ensure the voltage quality. However, compared with the mature active power control technology, the reactive power and voltage control equipment is...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/36
CPCH02J3/1807H02J3/36H02J2203/20Y02E40/30Y02E60/60
Inventor 宋少群陈峰黄文英赵海青余秀月郭瑞鹏
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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