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On-line Evaluation and Monitoring Method of Voltage Stability Based Only on Bus Amplitude Measurement

A voltage stabilization and bus voltage technology, applied in AC network voltage adjustment, electrical components, circuit devices, etc., to achieve the effect of reducing technical difficulty and cost, and improving the safe operation level of grid voltage

Active Publication Date: 2018-05-25
黑龙江省工研院资产经营管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] A search of patents and literature on methods using local measurement information in 2) found that existing methods are more or less limited to the need to collect information (including amplitude and phase information), and rely on continuous equivalent (including equivalent parameter identification) processing of the external power grid

Method used

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  • On-line Evaluation and Monitoring Method of Voltage Stability Based Only on Bus Amplitude Measurement
  • On-line Evaluation and Monitoring Method of Voltage Stability Based Only on Bus Amplitude Measurement
  • On-line Evaluation and Monitoring Method of Voltage Stability Based Only on Bus Amplitude Measurement

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Experimental program
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Effect test

Embodiment 1

[0061] A voltage stability online evaluation and monitoring method based only on bus amplitude measurement, comprising the following steps:

[0062] Step 1: Establishment of new voltage stability indicators and stability criteria

[0063] Note that the grid load bus to be monitored is k (see figure 1 ), whose voltage phasor is U k , the total bus load current phasor is I k , there are L loops of incoming lines supplying the bus load, and the load current phasor of the bus side of the lth loop is I l→k .

[0064] Assuming that the voltage phasor amplitude of the load bus k at a certain time t is obtained by digital sampling and signal processing technology Total load current phasor amplitude Load current phasor amplitude on the bus side of the lth incoming line Similarly, assume that the voltage and current phasor amplitudes before the interval time Δt have been obtained and

[0065] Therefore, the index for judging whether the voltage of the load bus k is stable ...

Embodiment 2

[0134] The present invention will be further described below in conjunction with the New England 39 node system calculation example.

[0135] Set the load at bus 15 to gradually increase (based on the original load of the New England 39 node system, simulated by setting different load growth coefficients), continuously detect the bus voltage phasor amplitude and load current phasor amplitude, and then examine the voltage The change law of the stability (point) index.

[0136] In the New England 39-node system, the load bus 15 has two incoming lines 14-15 and 16-15. Table 1 also lists the current phasor amplitude and the total load current phasor of these two incoming lines on the load bus side The amplitude and the magnitude of the bus voltage phasor vary with different load growth factors.

[0137] Using the data in Table 1, the curve that the voltage stability (point) index uniformly attenuates gradually with the bus load growth coefficient can be drawn ( Figure 4 ) and t...

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Abstract

The present invention provides a voltage stability online assessment and monitoring method only based on bus amplitude measurement. The method comprises: building the new voltage stability index and the stability criterion; predicating the trend attenuation relation of the voltage stability with the load increasing; tracking the inflection point of the voltage stability index with the load increasing from a falling-type attenuation mode to a cliff attenuation mode; tracking the inflection point of conversion of the bus voltage from a carefree state to a care state in the falling-type attenuation mode stage; and constructing and operating the online monitoring system of the distributed voltage stability. The voltage stability online assessment and monitoring method only based on the bus amplitude measurement only employs the amplitude measurement information of the bus to be monitored with no need for phase detection and being independent of external network and other values so as to greatly reduce the technical difficulty and cost of the system enforcement and control, monitor the load bus voltage stability state and the incoming line transmission capability margin limitation condition of the load connected to the bus on line in real time, and facilitate discovering the nodes having weak voltages and associated transmission and distribution capability crisis path in time.

Description

technical field [0001] The invention relates to the technical field of large power grid stable operation and online safety monitoring, in particular to an online voltage stability evaluation and monitoring method based only on bus amplitude measurement. Background technique [0002] Factors such as high-proportion renewable power grid connection, high-power DC transmission or asynchronous interconnection, rapid growth of large-capacity production-type transient loads or group-response living loads, and diverse types of accidents or disturbances, etc. Operational and online security monitoring presents great challenges. Having a stable voltage level is one of the basic requirements for the grid to reliably undertake high-quality power transmission and distribution tasks. Grid operation and control personnel or the operation and control system need to monitor the voltage stability of the grid in real time online, especially in the period when the grid operation mode or supply...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/12H02J13/00
CPCH02J3/12H02J13/00
Inventor 于继来王松岩张伟
Owner 黑龙江省工研院资产经营管理有限公司