EP0199695A2
Expired / Lapsed
EP
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Optimal control power system stabilizer using simulating state variables
Assignee: HUAZHONG INSTITUTE OF TECHNOLOGY
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Filing: 1986-04-17
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Granted: —
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Expires: 2006-04-17
Abstract
Abstract The present invention relates to an automatic device for depressing low frequency oscillation of power system. It consists of an electronic circuit incorporated in the original excitation regulator of a synchronous generator. This circuit can turn the input deviation of voltage AV into simulating state variable deviations of angular frequency Δω, of power ΔP and of power angle Δδ, and then outputs the sum of them according to the principle of optimal control. With the device of the present invention, the output capability of a remote power station may double, a whole set of measurement and feedback devices may be spared and the distortions in measurement may be avoided. The present device has further advantages of being small in size, cheap in cost, easy to establish and high in reliability.
Inventors
- 👤 Yuan Department Of Electric Power Ren
- 👤 Xianzhi Department Of Electric Power Chen
- 👤 Guojiu Department Of Electric Power Li
- 👤 Yongli Department Of Electric Power Zhang
- 👤 Yuanxi Feng
- 👤 Dake Huang
- 👤 Quanzhong Sun
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 01:31
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/10; H02P9/105
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
65 words
A power system stabilizer made up of electronic circuit for installation in fast excitation control curcuits of a generator characterized in that said power system stabilizer comprises circuits that take a variable of state or variable of measurement as input and transfer said input into full state variables, said variables of state being provided after regulated respectively by corresponding potentialmeters and added by an additor.
Claim 2
Dependent Claim
65 words
A power system stabilizer made up of electronic circuit for installation in fast excitation control curcuits of a generator characterized in that said power system stabilizer comprises circuits that take a variable of state or variable of measurement as input and transfer said input into full state variables, said variables of state being provided after regulated respectively by corresponding potentialmeters and added by an additor.
Claim 3
Dependent Claim
21 words
A power system stabilizer according to Claim 1, wherein said variable of state taken as input is the voltage deviation 4V.
Claim 4
Dependent Claim
30 words
A power system stabilizer according to Claim 2, wherein said full state variables are the angular frequency deviation Δω, the power angle deviation Δδ and the power deviation Δρ, respectively.
Claim 5
Dependent Claim
36 words
A power system stabilizer according to Claim 3, comprising a circuit that transfers the input ΔV into Δω, a differential circuit, a voltage-dividing circuit and an integral circuit that transfer Δω respectively into Ap, Δω, Δδ.
Claim 6
Dependent Claim
30 words
A power system stabilizer according to Claim 4, further comprising a bandpass filter circuit that transfers the input ΔV into Δω, a seperate differential circuit and a seperate integral circuit.
Claim 7
Dependent Claim
19 words
A power system stabilizer according to Claim 4, further comprising a bandpass filter circuit that has an integral circuit.
Claim 8
Dependent Claim
50 words
A power system stabilizer according to Claim 5 or 6, wherein said bandpass filter circuit is characterized in that the characteristic angular frequency ω 0 is 1.5 --2.5 times as big as the original low frequency oscillation angular frequency W r and its quality factor Q being more than 5.
Claim 9
Independent Claim
36 words
A method of depressing low frequency oscilliation of power systems characterized in that only one variable of the optical control full state variables is measured while all the other variables are transferred from measuring said variable.
Claim 10
Independent Claim
36 words
A method of depressing low frequency oscilliation of power systems characterized in that only one variable of the optical control full state variables is measured while all the other variables are transferred from measuring said variable.
Claim 11
Dependent Claim
17 words
A method according to Claim 8, wherein said state variable measured directly is the voltage deviation 4V.
Claim 12
Dependent Claim
27 words
A method according to Claim 9, wherein said state variables transfered are angular frequency deviation Δω , power angle deviation Δδ and the power deviation Δρ, respectively.
Claim 13
Dependent Claim
35 words
A method according to Claim 10, wherein said voltage deviation ΔV is first transferred into angular frequency deviation Δω , which is then integrated and differentiated to get full state variables Δδ and Δρ needed.
Claim 14
Dependent Claim
38 words
A method according to Claim 10, wherein said voltage deviation ΔV is first transferred into angular frequency deviation Δω and power angle deviation Δδ at the same time, and then Δω is differentiated to get the variable AP.
Claim 15
Dependent Claim
23 words
A method according to Claim 10, wherein said voltage deviation ΔV is transferred into angular frequency deviation Δω by the bandpass filter circuit.
Claim 16
Dependent Claim
42 words
A method according to Claim 13, wherein the characteristic angular frequency ω o of said bandpass filter circuit is 1.5--2.5 times as big as the original low frequency oscilliation angular frequency ω 1 and its quality factor Q being more than 5.
References Cited (Backward Citations)
No citation records indexed.
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