A novel AC PI controller and its applications on inverters
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This paper introduces an effort to overcome the zero steady-state errors resulting from the direct use of the conventional PI regulators to AC signal. A novel type AC PI (P+Resonant) regulator based on the theory of carrier-servo control systems that DC regulators are converted into AC regulators is applied to the inverter. Theory analyses and simulations verified the validity of the new regulator and show a better transient performance. The regulators also proved to be applicable to both single-phase and three-phase constant voltage constant frequency (CVCF) inverters.Keywords:
Constant (computer programming)
Transient (computer programming)
SIGNAL (programming language)
A voltage regulator, using solid-state switching techniques, for applications where the conventional series regulator and inductor type of switching regulator are impractical, will be described. Good regulation with high peak current capability are provided.
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THE CONCEPT of a generator voltage regulator as an amplifier which produces a large correction in field current for a small departure from normal voltage is quite well known. 1 In the conventional regulator, such as a directacting type, this amplification is secured partly in the regulator and partly in the exciter. A rotating amplifier-type regulator provides the amplification almost entirely in the rotating machines. Exciters may be used to obtain twoor more stages of amplification, or a single machine having high amplification such as a Rototrol exciter may be used. An example of two-stage excitation is a system with the regulator working in a pilot exciter field.
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Abstract : Since the advent of power electrical machinery, the problem of improved voltage regulation has always been a dominant factor. Recently, a new aircraft voltage regulator was designed using transistorized components. This regulator was considered to be non-linear degenerative feedback unit. Using the well defined procedures of servo analysis, dynamic and frequency response tests were taken of the regulator and the regulator-generator system. These tests were evaluated with a view toward developing a regulator describing function and a system function.
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Some kinds of no-contact tap changer AC voltage regulator topologies are analyzed and compared.On this basis,an on-load tap changer regulator which is fit to user is presented.Its voltage regulator precision is high and dynamic state response is quick,thus very adaptive to the user where high stable voltage is required.In addition,the principle is analyzed and current character is discussed.Finally,the experiment results demonstrate the feasibility of the no contract AC voltage regulator.
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A SCALDO(Supercapacitor Assisted LDO) regulator is a newly studied regulator to improve the efficiency of a LDO regulator. Commonly a LDO regulator has very low efficiency and a SCALDO regulator can improve it considerably because this regulator can reuse meaninglessly wasted energy at the LDO regulator by a supercapacitor witch is attached between input and a LDO regulator. However this regulator has several challenges because it is a being studied regulator. One of them is an overvoltage issue. At initial operating of this regulator, a supercapacior is totally discharged and input is connected with a supercapacitor and a LDO regulator in series. Thus, input voltage is enabled to a LDO regulator and this input voltage is a significant value to a LDO regulator because commonly input voltage is bigger than twice output voltage. In this paper, to solve this overvoltage issue, we proposed a new SCALDO regulator that has a pre-charger for charging a supercapacitor before starting operation. And we found that a proposed SCALDO regulator can properly reduce overvoltage of a LDO regulator through experiments.
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RECENTLY there has been considerable discussion of the benefits with respect to electric power system stability to be obtained by the use of a properly designed angle regulator. An angle regulator applied to a synchronous machine is defined here as a regulator that varies the machine excitation voltage in response to changes in the angle between the rotor interpole axis and the effective system voltage so as to tend to restore the initially set angle. The purpose of this article is to present the results of an analytical exploration of the possibilities of the angle regulator as regards stability. In particular, since voltage regulators already are used extensively, and since their use as aids in power-system stability already has been studied, it has seemed appropriate to compare the action of an angle regulator with that of a voltage regulator.
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In a power system, the role of a generator voltage regulator is to ensure that the output voltage is maintained within an acceptable threshold. In this paper a voltage regulator is proposed. The design of this regulator is based on both variable structure control theory and a pole assignment technique. The performance of the proposed regulator has been compared to that of the realistic regulator system proposed by the IEEE Committee on Excitation Systems. The results are discussed, and the pertaining recommendations are given.< >
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In this paper an adaptive voltage regulator for power systems is proposed. The design of this regulator is based on variable structure control theory. To make the regulator adaptive to the power system operating conditions, an artificial neural network is used. The effect of the proposed regulator has been compared to that of the realistic regulator system proposed by the IEEE Excitation Committee. The results are discussed and the pertaining recommendations are given.< >
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