Multi-zone Regulator Research Articles

On issue of increasing profitability of automated energy technology complexes for preparation and combustion of water-coal suspensions

The article considers the issues of energy technological complexes economy increase on the existing techniques of water-coal suspensions preparation and burning basis due to application of highly effective control systems of electric drives and neurocontrol. The automated control system structure for the main boiler components is given. The electric drive structure is disclosed by the example of pumps (for transfer of coal-water mash and / or suspension). A system for controlling and diagnosing a heat and power complex based on a multi-zone regulator is proposed. The possibility of using neural networks for implementing the control algorithms outlined in the article is considered.

Features of modes of a multizone integrating controller with an even number of relay elements

Operation modes of an integrating multizone controller with pulse-width modulation frequency and an even number of relay elements are discussed. Integrating multizone controllers have high noise protection, precision, multifunctionality, and simple technical realization. Due to such properties, they make it possible to solve an entire complex of technical problems to improve the resource and energy-efficiency characteristics of systems of technological process control based on these controllers. A block scheme of a multizone regulator with an even number of relay elements is given. Time diagrams of a multizone controller with two and four relay elements are shown so as to explain the principles of its operation. Based on this analysis, recommendations are given for the use of a multizone controller in low-voltage information devices, in particular, in regulators, sensors, etc. The field of application of integrating multizone controllers in control systems of electric drives in technological devices is determined. In particular, an example of construction of a discrete control system of a group of electric drives with parallel control channels is discussed. The block scheme of a discrete control system of the group with an odd number of asynchronous electric water-pump drives controlled by thyristor regulators is presented. Such a solution provides soft-start electric drives with a predetermined limiter of starting current. In the proposed scheme, the main disadvantage of a multizone system with an even number of relay elements is eliminated. In particular, blocking of additional relay element commutation is implemented when the multizone controller switches from one modulation zone to another.

Многозонные частотно-широтно-импульсные интегрирующие регуляторы с «эстафетными» алгоритмами работы релейных элементов

The basic structure and operating principle of the multizone integrating regulator are considered in the paper. The regulator is based on multizone frequency-width-pulse modulation. The virtual model of the multizone regulator is made in the MATLAB + Simulink program. Time diagrams of the regulator are constructed with a virtual model. Main equations and static characteristics of multizone the regulator, in particular, amplitude and modulation characteristics are given. Advantages and disadvantages of the regulators are mentioned. Two ways of relay algorithm are offered in paper. Relay elements are parts of the regulator. In particular, multizone regulator with self-reactance and unit-counting relay algorithm are shown. The main advantage of relay algorithms is the ability to provide a uniform distribution of the power loss between the output power keys. It enables improvement of energy performance of the control system and of its reliability. The structures of multizone regulators with relay algorithms and time diagrams of the signals are given. Example of the temperature control system in the electric heating installation based on the multi-zone AC regulator is provided. The “rotating” thermal field is generated in the “relay” mode of electric heaters. As a result, uneven temperatures in the heating installation are reduced by at least 3–5 times. This paper can be interesting for power and information electronics, electric drive and process automation specialists.

The dynamic characteristics of a multizone regulator with frequency–width–pulse modulation at harmonic modulation of a relay element’s switching thresholds

Results of analysis of dynamic characteristics of a multizone integrating frequency–width–pulse regulator (MR) under the influence of a harmonic interference signal over a wide frequency range for thresholds of the leading relay element are considered in this article. A block diagram of the MR and time diagrams of its signals and amplitude and modulation characteristics, as well as basic relations for their construction, are given. Analysis of the MR behavior with harmonic modulation of switching thresholds of relay element is carried on the basis of the character of the behavior of the MR transmission coefficient and the deviation of the sampling interval of its output pulses from the value by a predetermined control signal. The results of the analysis are presented in the form of the dynamic state space of the MR and logarithmic amplitude–frequency characteristics in the investigated frequency range of harmonic signal interference.