Coordinated emergency control method for near-region power grid voltage of phase modifier

A power grid voltage and emergency control technology, applied in AC network voltage adjustment, circuit devices, AC network circuits, etc., can solve problems such as low reactance, long-term low point suspension of nearby voltage, low capacity of 500kV substation, etc., and achieve high speed Fast, good computability and wide adaptability, easy to calculate effects

Active Publication Date: 2018-03-02
CHINA ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For areas with prominent voltage stability problems, the dynamic reactive power of two 300MVar condensers can only provide reactive power support and suppress commutation failure during AC system failures, and cannot solve the long-term low voltage suspension in the near area and the low capacity of the 500kV substation in the nearby area. , Coordinated emergency control problem with low resistance

Method used

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  • Coordinated emergency control method for near-region power grid voltage of phase modifier
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  • Coordinated emergency control method for near-region power grid voltage of phase modifier

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Embodiment 1

[0047] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0048] The invention provides an emergency control method for voltage coordination and emergency control of a power grid in the near area with a regulator, the flow chart is as follows figure 1 shown, including the following steps:

[0049] Step 1. Build the data model of the power grid with the regulator:

[0050] Step 2. Regardless of the dynamic reactive power support capability of the condenser, check the stability of the power grid by adopting AC and DC system faults;

[0051]Step 3. Determine and distinguish the type of voltage stability problem caused by the fault: if the low voltage of the power grid in the vicinity of the condenser is suspended, go to step 4; if the voltage of the power grid in the vicinity of the condenser is collapsed, go to step 7;

[0052] Step 4. Throwing / cutting capacitive reactors; throwing / cutting capacitive ...

Embodiment 2

[0072] The technical solution provided by the present invention will be further described in detail below by taking the Qishao DC near-area power grid as an example. The Qishao DC receiving end is equipped with a 300MVar condenser.

[0073] Step 1. Build the power flow data model and stability data model of the power grid with the regulator. In the PSD-BPA program, the power grid data including the regulator is established, the system reference capacity is taken as 100MVA, and the equipment parameters are all taken as per-unit values ​​based on the system reference capacity. Adjust the grid operation mode, the specific grid structure is as attached figure 2 shown.

[0074] Step 2, check the stability of the grid built in the first step. Specifically, adjust the steady-state output of the power flow data model to zero, and control the steady-state data model to set the reactive power output to zero; at the same time, the AC adopts N-1 or N-2 faults, and the DC adopts unipola...

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Abstract

The invention provides a coordinated emergency control method for near-region power grid voltage of a phase modifier. The coordinated emergency control method comprises the steps of building a data model of a power grid containing a phase modifier; checking the stability of the power grid by adopting an AC / DC system fault; distinguishing the type of a voltage stability problem caused by the fault;if the voltage stability problem is near-region power grid low-voltage suspension of the phase modifier, firstly switching a low-voltage capacitive reactor by turns, and then adopting fixed maximum reactive power output control for the phase modifier; if the voltage stability problem is near-region power grid voltage collapse, adopting fixed maximum reactive power output control for the phase modifier; then judging whether the system voltage recovers or not, if so, exiting, otherwise, firstly switching the low-voltage capacitive rector by turns, and then adopting fixed maximum reactive poweroutput control for the phase modifier. The method provided by the invention can provide emergency control and control indicators in allusion to the near-region power grid voltage of the phase modifier, thereby providing a technical reference for a new generation of phase modifiers to participate in coordinated emergency control for the near-region power grid voltage.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a method and system for emergency control of a near-area power grid voltage coordination of a condenser. Background technique [0002] The condenser has the technical characteristics of high technical maturity, good operation stability, and strong adjustment ability, and the floor area is about 1 / 3 of the same capacity SVC (Static Var Compensator, static var compensator), and the service life can reach 30 years as long as. The maximum design capacity of a single domestic condenser can reach 300Mvar, which enables the condenser to be used to solve the problems of insufficient dynamic reactive power reserve and poor local voltage stability in the power system. [0003] According to the plan, my country's power grid will apply the condenser technology in the DC sending end, the DC high-power receiving area, and the multi-feed receiving area. After the DC sending e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16H02J3/50
CPCH02J3/001H02J3/16H02J3/50H02J2203/20Y02E40/30
Inventor 申旭辉谢岩唐晓骏马世英徐友平谢珍建张志强李晓珺邵德军张鑫霍启迪潘晓杰罗红梅李晶郑超徐遐龄陈得治李海峰罗凯明金涛周俊梁海平李少岩宋云亭李媛媛陈湘吕思卓张恺张晨李惠玲吴丽华李再华
Owner CHINA ELECTRIC POWER RES INST
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