CN105203836B - A kind of active amount of unbalance measuring method of regional power grid - Google Patents
A kind of active amount of unbalance measuring method of regional power grid Download PDFInfo
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- CN105203836B CN105203836B CN201510549245.4A CN201510549245A CN105203836B CN 105203836 B CN105203836 B CN 105203836B CN 201510549245 A CN201510549245 A CN 201510549245A CN 105203836 B CN105203836 B CN 105203836B
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Abstract
The present invention relates to a kind of active amount of unbalance measuring method of regional power grid, comprise the following steps：(1) every generator i active amount of unbalance Δ P is gone out in measured zone power networki；(2) the transimission power P before the every interconnection l disturbance of the regional power grid and external electrical network is measuredl0With the transimission power P after disturbancel1, and then calculate the active power changes delta P on every interconnection ll=(Pl1‑Pl0)；(3) formula is passed throughCalculate the active amount of unbalance Δ P of the regional power grid.Change by surveying the frequency change rate of all generators and the regional power grid and the transimission power of all interconnections of external electrical network in regional power grid before and after Power System Disturbances calculates the active amount of unbalance of the regional power grid in real time；There is the assurance of entirety to the running status of regional power grid and provide reference to implement next step control measure, cutting the control measure such as machine, off-load for regional power grid implementation provides foundation, and guarantee is provided for power system security stable operation.
Description
Technical field
The invention belongs to power system frequency and active power response field, and in particular to a kind of active injustice of regional power grid
Weigh measuring method.
Background technology
The top priority of power system is to maintain the equilibrium of supply and demand of electric energy, when power system because active injustice occurs in disturbance
During measurement, frequency, voltage and the power-angle stability of power system can be influenceed.The active amount of unbalance for obtaining power system is to carry out
Cut the prerequisite of the operations such as machine, off-the-line and off-load.At present, the operations such as machine, off-the-line and off-load of cutting of system are mainly base
In local response message, acted according to the Policy Table adjusted in advance, lack the assurance to whole system state, seriously disturbed
It is dynamic that possibly can not effective guarantee system safe and stable operation down.Therefore, WAMS etc. is made full use of to measure communication system, in real time monitoring
The active amount of unbalance of power network after the running status of power network and quick calculation perturbation, to carrying out the control of next step and ensureing electric power
The stability of a system will important function.However, in the prior art also without a kind of convenience and high-efficiency it is active to regional power grid not
The method for balancing measurement.
The content of the invention
It is an object of the invention to provide a kind of active amount of unbalance measuring method of regional power grid, to calculating rapidly and efficiently
The active amount of unbalance of power network after disturbance.
To achieve the above object, the solution of the present invention includes：
A kind of active amount of unbalance measuring method of regional power grid, comprises the following steps：
(1) every generator i active amount of unbalance Δ P is gone out in measured zone power networki；
(2) the transimission power P before the every interconnection l disturbance of the regional power grid and external electrical network is measuredl0With the biography after disturbance
Defeated power Pl1, and then calculate the active power changes delta P on every interconnection ll=(Pl1-Pl0)；
(3) formula is passed throughCalculate the active amount of unbalance Δ P of the regional power grid；Wherein, N0
For generator sum, N in the regional power grid1For the regional power grid and external electrical network interconnection sum.
In the step (1) in measured zone power network every generator i active amount of unbalance Δ PiMode be：Measurement
Before and after disturbance in regional power grid every generator i frequency change rate dfi/ dt, so calculate every generator i it is active not
AequumWherein, fnFor system nominal frequency, TiFor the inertia time constant of i-th generator, SiFor
The rated capacity of i-th generator.
The beneficial effects of the invention are as follows：By the frequency for surveying all generators in regional power grid before and after Power System Disturbances
Rate of change and the regional power grid and the change of the transimission power of all interconnections of external electrical network calculate the regional power grid in real time
Active amount of unbalance；There is the assurance of entirety to the running status of regional power grid and provide ginseng to implement next step control measure
Examine, cutting the control measure such as machine, off-load for regional power grid implementation provides foundation, and guarantor is provided for power system security stable operation
Barrier.
Brief description of the drawings
Fig. 1 is the node system schematic diagrames of IEEE 39 (dashed box part is regional power grid).
Embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
The active amount of unbalance measuring method of regional power grid of the embodiment of the present invention, comprises the following steps：
(1) the frequency change rate df of every generator i in regional power grid before and after disturbing is measuredi/ dt, and then calculate every
Generator i active amount of unbalance Δ Pi。
Measure the frequency change rate of every generator i in regional power grid before and after disturbing, dfi/ dt represents 40ms after disturbing
Frequency change rate, pass through formulaCalculate every generator i active amount of unbalance Δ Pi.Wherein, fn
For system nominal frequency, TiFor the inertia time constant of i-th generator, SiFor the rated capacity of i-th generator.
(2) the transimission power P before the every interconnection l disturbance of the regional power grid and external electrical network is measuredl0With the biography after disturbance
Defeated power Pl1, and then calculate the active power changes delta P of l on every interconnectionl。
Measure the transimission power P before the every interconnection l disturbance of the regional power grid and external electrical networkl0With after disturbance during 40ms
Transimission power Pl1, and then calculate the active power changes delta P on every interconnection ll=(Pl1-Pl0)。
(3) the active amount of unbalance Δ P of the regional power grid is calculated.
Pass through formula
The active amount of unbalance Δ P of the calculation perturbation moment regional power grid, wherein, N0It is total for generator in the regional power grid
Number, N1For the regional power grid and external electrical network interconnection sum.
In the above-described embodiments, in the step (1) in middle measured zone power network every generator i active amount of unbalance
ΔPiMode be：Measure the frequency change rate df of every generator i in regional power grid before and after disturbingi/ dt, and then calculate every
Platform generator i active amount of unbalanceAs other embodiment, measured zone by other means
Go out every generator i active amount of unbalance Δ P in power networki。
The present invention is described in further detail below by specific example.
As shown in figure 1, the node systems of IEEE 39, dashed box is interior to need to carry out the regional power grid of active amount of unbalance calculating,
There is a generator (No. 38 generators) in the regional power grid, three interconnection (25- are shared between the regional power grid and external electrical network
26,3-18,16-17).Disturb as No. 39 unit trippings.40ms after disturbance, three interconnections can be measured and passed to the regional power grid
The frequency change rate that defeated power increases 32MW, 131MW, -246MW, No. 38 units respectively is -0.225, the inertial time of the unit
Between constant be 69s, rated capacity 100MW, the active amount of unbalance that the regional power grid can be tried to achieve according to formula (1) is 32+
131-246-0.225*69*100/50=-114MW, i.e., active vacancy are 114MW.
Claims (1)
- A kind of 1. active amount of unbalance measuring method of regional power grid, it is characterised in that：Comprise the following steps：(1) every generator i active amount of unbalance Δ P is gone out in measured zone power networki；The active amount of unbalance Δ PiSide Formula is：Measure the frequency change rate df of every generator i in regional power grid before and after disturbingi/ dt, and then calculate every generator I active amount of unbalanceWherein, fnFor system nominal frequency, TiFor the inertia time of i-th generator Constant, SiFor the rated capacity of i-th generator；(2) the transimission power P before the every interconnection l disturbance of the regional power grid and external electrical network is measuredl0With the transmission work(after disturbance Rate Pl1, and then calculate the active power changes delta P on every interconnection ll=(Pl1-Pl0)；(3) formula is passed throughCalculate the active amount of unbalance Δ P of the regional power grid；Wherein, N0For this Generator sum, N in regional power grid1For the regional power grid and external electrical network interconnection sum.
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Inventor after: Li Ye Inventor after: Yang Yingxuan Inventor after: Yang Luyu Inventor after: Bao Zhiqian Inventor after: Zhang Lu Inventor after: Wang Qingping Inventor after: Zhang Baohui Inventor after: Zhao Yingke Inventor after: Mou Ying Inventor after: Ma Xiaowei Inventor after: Wang Lin Inventor before: Li Ye Inventor before: Bao Zhiqian Inventor before: Zhang Lu Inventor before: Wang Qingping Inventor before: Zhang Baohui Inventor before: Zhao Yingke Inventor before: Mou Ying Inventor before: Ma Xiaowei Inventor before: Wang Lin |
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Effective date of registration: 20161130 Address after: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Applicant after: Xuji Group Co., Ltd. Applicant after: Xi'an Jiaotong University Applicant after: State Grid Corporation of China Applicant after: Xuchang Xuji Software Technology Co., Ltd. Applicant after: Electric Power Research Institute of State Grid Liaoning Electric Power Co., Ltd. Address before: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Applicant before: Xuji Group Co., Ltd. Applicant before: Xi'an Jiaotong University Applicant before: State Grid Corporation of China |
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