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Reactive power control and SVG (static var generator) coordinated control method and system of direct current power transmission system

A DC transmission system, coordinated control technology, applied in the direction of reactive power adjustment/elimination/compensation, power transmission AC network, etc., can solve the problems of AC system voltage fluctuations, converter loss increase, etc., to reduce converter loss , reduced running time, and reduced voltage fluctuation

Pending Publication Date: 2022-07-05
STATE GRID ECONOMIC TECH RES INST CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the SVG control and QPC control do not match, it will cause the converter to operate at an angle greater than the rated angle for a long time, resulting in an increase in the loss of the converter, and the switching of the passive filter during the DC power up and down process will also cause DC power and AC system voltage fluctuation

Method used

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  • Reactive power control and SVG (static var generator) coordinated control method and system of direct current power transmission system
  • Reactive power control and SVG (static var generator) coordinated control method and system of direct current power transmission system
  • Reactive power control and SVG (static var generator) coordinated control method and system of direct current power transmission system

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Embodiment 1

[0047] Example 1: as figure 1 As shown, the reactive power control and SVG coordinated control method of the DC power transmission system provided by this embodiment includes the steps:

[0048] Step S1: The reactive power compensation device SVG is configured in the converter station, the QPC module is configured in the DC control system of the converter station, and the coordinated control between reactive power control and SVG is judged according to the set conditions.

[0049] Specifically, when the inverter of the local station is in the unlocked state Deblock=1, the reactive power control of the local station is in the Q control mode, and Enable=1 (manually start the coordinated control of reactive power control and SVG), the reactive power control The coordinated control with SVG is input; otherwise, the coordinated control of reactive power control and SVG exits, and the PI integrator of QPC is cleared to avoid the influence of the calculation result of this time on th...

Embodiment 2

[0072] Embodiment 2: The above embodiment 1 provides a reactive power control and SVG coordinated control method of a DC power transmission system. Correspondingly, this embodiment provides a reactive power control and SVG coordinated control system of a DC power transmission system. The system provided in this embodiment can implement the reactive power control and SVG coordinated control method of the DC power transmission system of the first embodiment, and the system can be implemented by software, hardware, or a combination of software and hardware. For the convenience of description, when describing this embodiment, the functions are divided into various units and described respectively. Of course, during implementation, the functions of each unit may be implemented in one or more software and / or hardware. For example, the system may include integrated or separate functional modules or functional units to perform corresponding steps in each method of the first embodiment...

Embodiment 3

[0078]Embodiment 3: This embodiment provides an electronic device corresponding to the reactive power control and SVG coordinated control method of the DC power transmission system provided in the first embodiment. The electronic device may be an electronic device used for a client, such as a mobile phone and a notebook A computer, a tablet computer, a desktop computer, etc., to execute the method of the first embodiment.

[0079] like Figure 4 As shown, the electronic device includes a processor, a memory, a communication interface and a bus, and the processor, the memory and the communication interface are connected through the bus to complete mutual communication. The bus may be an Industry Standard Architecture (ISA, Industry Standard Architecture) bus, a Peripheral Component Interconnect (PCI, Peripheral Component) bus or an Extended Industry Standard Architecture (EISA, Extended Industry Standard Component) bus and the like. A computer program that can be run on the pr...

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Abstract

The invention relates to a reactive power control and SVG coordination control method and system of a DC power transmission system. The method comprises the following steps: calculating the exchange reactive power Q of a current converter station and an AC system; setting a dead zone range of the Q, and carrying out limited output on the Q; setting a limiting condition that the SVG has an adjusting capability, and judging whether the reactive power emitted by the SVG is limited or not; and calculating the input of a PI controller in the QPC module based on whether the reactive power emitted by the SVG is limited or not and the exchange reactive power limitation result of the converter station and the alternating current system, and completing the reactive power control and SVG coordination control process. When the control method is adopted, the operation time of the converter larger than the rated angle is obviously shortened, the loss of the converter is effectively reduced, the power rising and falling process of the direct-current system is stable, and the voltage fluctuation of the alternating-current system caused by switching of the passive filter is greatly reduced.

Description

technical field [0001] The present invention relates to a method and system for coordinated control of reactive power control of a direct current transmission system and SVG (Static Var Generator, static var generator), and relates to the field of direct current transmission of electric power systems. Background technique [0002] The DC transmission system can realize long-distance and large-capacity power transmission, can be used for asynchronous networking of power systems, and play an active role in improving system security and stability. The operation of the converter, which is the core component of AC-DC conversion, consumes a lot of reactive power, so reactive power compensation control is an extremely critical link in the control strategy of the DC transmission system. First, a reasonable reactive power compensation control can ensure the continuous and stable operation of the DC system. Secondly, using the fast and flexible characteristics of DC transmission syst...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/18
CPCH02J3/36H02J3/1842H02J3/1864H02J2003/365
Inventor 钟启迪宋胜利马玉龙张和李明李志闯季一鸣蒲莹卢亚军刘琳
Owner STATE GRID ECONOMIC TECH RES INST CO
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