SU1156039A1 - Controller of capacitor bank - Google Patents

Abstract

AUTO IATIC CONDENSING BATTERY REGULATOR, containing a measuring voltage converter, a command unit and an actuator connected to the output of this unit, characterized in that, in order to improve the reactive power compensation mode, a measuring power converter of reactive power, an adder, two the threshold elements, the key elements, the converter of the total power of the included capacitors into the corresponding voltage increment, and a logic unit consisting of the AND gate and two logical elements NOT, one of which is connected between the output of the first threshold element and one of the inputs of the logical element AND, the other input of which is connected to the output of the second threshold element, the output of the logical element AND is connected to the control input of one of the key elements connected between the output the voltage converter and the command unit, and through the second logic element is NOT to the control input of another key (the first element connected between the output of the measuring converter reactive power and command unit, the adder inputs connected respectively to the outputs of the transmitter voltage and reactive power, and total power transducer ate. The connected capacitors correspond to the following: the increment of the voltage, and the output with the inputs of the threshold elements, the outputs of which are connected DO QD to the input of the logic unit. .

Description

The device is designed to work with capacitor banks to automatically regulate their reactive power.

Automatic capacitor bank regulators are known, in which the regulation is carried out according to a single parameter L.

Closest to the proposed technical entity and the proposed result is an automatic regulator of capacitor batres containing a voltage measuring transducer, a command unit and an actuator connected to the output of this unit. In this device, as a control parameter, the voltage is taken up with a correction by reactive current 2

Depending on the specific conditions, the regulator can be configured in such a way that the determining voltage in the combined control parameter (i-K1p) is either a voltage or a reactive current. When voltage is decisive, tuning is usually used in networks where it is possible for voltage to deviate beyond acceptable values. - But then, in the range of allowable voltage values, the necessary compensation of reactive power is not achieved.

The purpose of the invention is to improve the reactive power compensation mode.

This goal is achieved by introducing into the automatic regulator of capacitor batteries consisting of a measuring converter of voltage i of a command block and an actuator connected to the output of this block, a reactive power measuring converter, an adder, two threshold elements, key elements, a total converter the power of the included capacitors in the corresponding voltage increment and the logic unit consisting of the AND gate and two NOT logic gate, one of the second is connected between the output of the first threshold element and one of the inputs of the logical element I, the other input of which is connected to the output of the second threshold e.gmemen1-a, the input of the logic element AND is connected to the control input of one of the key elements connected between the output of the measuring voltage converter and the command unit, through the second logic element NOT to the control input of another key element connected between the output of the reactive power measuring transducer and the command unit, in the outputs of the adder are connected respectively to the outputs of the measuring voltage and reactive power converters, as well as the total power converter of the included capacitors to the corresponding voltage increment, and the output to the inputs of the threshold elements whose outputs are connected

 to the input logic block.

The drawing shows a block diagram of the automatic control of capacitor banks.

The regulator consists of the measuring reactive power converter 1, the measuring voltage converter 2, the adder 3, the threshold elements 4 and 5, the logic unit 6, the key elements 7 and 8, the command unit 9, the executive unit 10, which, depending on the the signals from the command block enable or disable the capacitor bank sections,

Converter 11 of the total power of the included capacitors to the corresponding voltage increment. Logic block 6 consists of logical elements NOT 12 and 13 and

logical element and 14.

Measuring transducer of reactive power 1 converts reactive power in the circuit of installation of the controller Q into an electrical signal

5 DC Well This signal is also proportional to the increment of the voltage corresponding to the full compensation of this reactive power, i.e.

0 and K -,

P

where K is the proportionality coefficient;

X - reactance 5 of the mains;

and - nominal mains voltage; U.U is the connection of the mains voltage, expected with a glitch compensation of reactive power. The input of the adder 3 also receives the output signal of the voltage transducer 2, the proportional voltage in the network, and the signal from the transducer of the total power of the included capacitors to the corresponding voltage increment. The latter is (5Рк;) - X .ш, -, and ---. where 51 is the total reactive power of the currently included capacitors. The output signal of the adder 3 U U + UQ-U is proportional to the expected value of the mains voltage in the case of full compensation of reactive power. This signal is fed to the inputs of the threshold elements 4 and 5. The threshold element 4 is triggered, i.e. its output signal changes from one to zero if u exceeds the lower limit of the range of allowable voltage values, and threshold element 5 if it exceeds the lower limit. If the expected voltage U is found in the range of acceptable values, i.e. when the output signal of threshold element 4 is zero, and that of threshold element 5 is unity, a single signal is generated at one of the outputs of logic block 6, which unlocks key element 7. At the same time, command signal 9 receives a signal of reactive power and control occurs. power. The formation of the unlocking signal in logic block 6 is 394 as follows. The zero signal from the output of the threshold element 4 is inverted with the aid of the logic element NO 12 and fed to one of the inputs of the logic element AND 14. Since there is also a single signal at the second input of this element, its output voltage becomes zero. At the output of the logical element HE 13 connected to the control circuit of the key element 7, a single signal arises. When Uj is out of range, i.e. when the output signals of both threshold elements are equal to either zero or one, at the output of logic block 6 connected to the control circuit of key element 8, a single signal is formed that unlocks key element 8. Simultaneously, key element 7 is locked. voltage converter, i.e. control by voltage occurs. Thus, in advance, before the signal is applied to the input of the command block, the control parameter is selected. If the voltage expected to be fully compensated for the reactive power consumed by the load at a given time, the voltage goes beyond the permissible limits, then the voltage is selected as the control parameter, if not, the reactive power. The economic effect of the proposed technical solution is achieved by more fully compensating for reactive power while maintaining the voltage in the range of acceptable values.

Claims (1)

AUTOMATIC CAPACITOR BATTERY REGULATOR, comprising a voltage measuring transducer, a command unit and an actuator connected to the output of this unit, characterized in that, in order to improve the reactive power compensation mode, a reactive power measuring converter, an adder, two threshold elements, key elements, a converter of the total power of the connected capacitors into the corresponding voltage increment and a logical block consisting of a logical element And and two logical elements are NOT, one of which is connected between the output of the first threshold element and one of the inputs of the logical element AND, the other input of which is connected to the output of the second threshold element, the output of the logical element And is connected to the control input of one of the key elements connected between the output of the measuring transducer voltage and the command unit, and through the second logic element NOT to the control input of another key element connected between the output of the measuring transducer reactively , Power and command unit, the adder inputs connected respectively to the outputs of voltage and reactive power transducers, as well as the total power converter included in the corresponding capacitor voltage increment, and the output - to the inputs of the threshold elements, the outputs of which are connected to the input of logic block. \