SU612342A2 - Arrangement for control of controllable reactive power source - Google Patents

Description

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The power supply of the fire equipment to the electrical equipment I is intended to improve the quality of electric power in electric grids equipped with a controlled source of reactive power, and is an improvement of the invention.

Of the basic author's certificate MO 458921 is known a device for controlling an adjustable source of reactive power connected to the power buses of a group of fast-alternating consumers, containing sensors for the reactive and active components of the consumer currents and a block for summing the signals of these sensors.

This device cannot ensure the total absence of voltage fluctuations on the tires of the load node, since it takes into account only those voltage changes that are caused by changes in active and reactive consumer GOKCs, and do not take into account those voltage changes that are accounted for. Changes for example 1 and in the grid of the power system itself on primary lashing of feeding grissformagor.

It should be noted that modern analyzers of downstream substations of industrial enterprises are provided with switchings of windings for adjusting voltage under load (RPN). However, these on-load tap-changers are designed to compensate for seasonal and daily voltage changes, have a specially provided zone of sensitivity and time delay, and cannot provide compensation: there would be rapid changes (fluctuations) in the voltage of the power system.

In addition, power system voltage fluctuations may occur due to the operation of other enterprises, sometimes located several kilometers away; | even further from the object.

The purpose of the proposal is to improve the quality of electricity on the load node tires and to increase the reliability and efficiency of consumers' work in the presence of voltage changes, especially fast, in the power system network.

Claims (1)

To achieve this, the device is on Aug. Ev, No. 458921. additionally equipped with a sensor connected to the buses of the network supplying consumers and an inertial link whose input is connected to the sensor voltage, and the outputs of the voltage and inertial link connected to the additional digits of the summation unit. The drawing schematically shows the device. In it, a step-down transformer 3 is connected to the power system 1 by means of a line, the secondary winding of which is connected to the power bus 4, from which the consumers get power 5. This scheme is the most characteristic element of industrial power supply systems and is usually called a load node. To improve the quality of electricity, an adjustable reactive power source 6 is connected to the buses 4. The control summing unit 7 is connected to the control input source 6, for which, for example, a magnetic or operational amplifier can be used, which performs the function of algebraic summation. Block 7 is given with thunder inputs, however, it may have a greater number of inputs. . which, if necessary, can use1. for initial setting of source mode 6 or for other purposes, for example, to monitor the behavior of other consumers. . In addition to the block, 7 ,. which is a common cop for the well-known and proposed yci. It is equipped with an additional voltage pin 8 connected to the Power buses and inertial Avenue 9, the input of this link 9 is connected to the output of the sensor 8, and their outputs are connected with mutually opposite polarity to the inputs of the unit 7. As the sensor 8 can A measuring transformer with a rectifier connected to it, or a standard voltage sensor from the series of uni (} vol. ... ”of the modulated block control system.) The inertia link has a transfer function, therefore, the output voltage of this The link is related to the input voltage with the food ratio: .. Jabix in pT „„ where P is txiepatop Laplace: T is a constant time. Inertial transfer image is a transfer function that has the following property In the steady state mode, its output voltage is equal to the input ., and with a jumped change in the input voltage, the output voltage will change to its new value smoothly on the exponent from the backside. An operational (phi close to its properties) amplifier, for example, can be used as an inertial link. a unified blocking control circuit, at the input of which a resistor is connected, and in the feedback circuit a resistor and a capacitor in parallel. This link is called aperiodic. The device works as follows. With a constant voltage on the load node tires, the output voltage of the inertial link 9 is unchanged and due to the inverse polarity balances the signal supplied to the input of unit 7 directly from the output of the sensor 8. The magnitude of the reactive current of the source remains unchanged. When the voltage changes in the power system and, consequently, on the load node tires, the output signal of sensor 8 instantaneously changes, while the output signal of the inertial link 9 will change medically, resulting in an equilibrium of the signals taken from them at the input of unit 7 and the source from the output of block 7, the resulting signal is changed, it changes more specifically the value of its reactive current, and the output, thus, the magnitude of the voltage change in 4 load nodes. After the time, determined by the constant time of the inertial link, the output signal is compared with the input, the equilibrium of the signals taken from the sensor of the link 9 to the output. j is set again and the source returns to the original mode. The beneficial effect from the application of the proposed device is that if voltage changes occur in the power system, then the corresponding voltage changes on the load node tires will occur more slowly, i.e. The quality of electricity at consumers will be higher, due to which the reliability of their work will increase. The proposed device can be used in the networks of industrial enterprises supplied with t. Both static RIRIs and rotating ones, for example, high-speed synchronous compensators or synchronous, both with and with high-speed excitation. IF this is the case, individual work is fast and often changing. load, the proposed device can work in conjunction with other innovative devices, providing a better quality of electricity or an increase in the energy performance of the load node. Claims The device for controlling the navigation window No. 458921, which is designed to increase the reliability of the work of the cellar, is ... r; r .. "- the voltage and inertial link is connected to the additional inputs of the summation unit. Sources of information taken into consideration „jr; ., i-rr ntt-gw ,.