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INVENTION
Russian Federation Patent RU2094839
Transformer-thyristor compensator voltage deviation and reactive power
Name of the inventor: Klimash Vladimir Stepanovich
The name of the patentee: Klimash Vladimir Stepanovich; Komsomolsk-on-Amur State Technical University
Address for correspondence:
Starting date of the patent: 1994.06.29
Use: the apparatus is designed to improve the quality of electricity and its economy. The inventive expansion of the range of the network reactive power compensation and output voltage variations, but also improve the weight and size of transformer equipment. The goal is achieved by making the switch into a booster transformer, and the voltage amplitude of the inverter phase from the DC link and a two-way exchange of energy. The voltage boost mode converter receiving power from the load circuit and in the mode voltovycheta returns energy to the network. these modes is controlled by phase control of the inverter system and the reversible rectifier separate control together with current sensors, voltage and reactive power.
DESCRIPTION OF THE INVENTION
The invention is used in systems with continuously variable phase and effective value of the load voltage.
The signal from the load voltage deviation of the sensor is fed to the main inverter control system. By changing the angle of thyristor control of the inverter regulate the effective value of the voltage at the load. The signal from the sensor network reactive power is supplied simultaneously to the inverter control system, driven network, the output connected to the network, and rectifier control system input connected to the load. In voltopribavleniya mode, this signal changes rectifier thyristor control angle and mode voltovychetaniya inverter thyristors, slave network and regulates the consumption of reactive power network. Resolution on the management of the rectifier or inverter driven network, made separate control unit when it is applied to the signal from the sensor input current direction of the main inverter. This allows the input of reactive power compensation with a certain effective value of the output voltage, regardless of voltage variations with respect to the sign of a given level, but also on the size and nature of the load. This is achieved by expanding the range of compensation of voltage variations and reactive power, but also improve the weight and size, as a result of the connection of input terminals of the rectifier to the load, and the inverter output terminals, the slave network, network and application management on a separate sign of the input current of the main inverter.
The invention relates to power electronics and is intended to stabilize the output voltage and input reactive power compensation.
Known transformer and thyristor control device comprising two inverters synchronized with the total generator and two two-winding transformer whose primary windings are connected in series and connected between the network and the load. The inputs of inverters connected to a common power source, and outputs to the secondary windings of transformers [1]
The device provides a load by the voltage regulating phase control of the inverter output voltage relative to the other one of the inverter output voltage and summing these voltages using transformers.
The disadvantages of the device is necessary to carry a lot of weight and dimensions of transformers, but also the lack of compensation for voltage variations and reactive power.
The closest to the proposed is a transformer-thyristor compensator voltage variations and reactive power, which contains a rectifier, two inverters synchronized with network management and two-phase two-winding transformer system as well, and a sensor network reactive power supplied to the two single-phase current transformers and deflection sensor load voltage [2] The primary windings of the transformers are connected in series and connected between the network and the load, and their secondary windings connected to the outputs of inverters whose inputs are combined and connected through a rectifier to the load. The control input of the main inverter control system is connected to the sensor load voltage deviation, and the control input of an additional inverter control system, driven network, to the output of the sensor network reactive power.
The disadvantages of the device is necessary to carry a lot of weight and dimensions, due to the use of two transformers and also to the increase in installed capacity in order to prevent saturation of magnetic circuits with high-speed regulation of output voltage inverter phases, and a limited range of compensation of voltage deviation and reactive power due to the rectifier connections only to load or network only in conditions of high and low values of the mains voltage to the extent and nature of the load.
The purpose of the invention, improved weight and size and expansion of the range of compensation of voltage variations and reactive power.
The goal is achieved by the fact that the other findings of the primary winding of the transformer are connected to the network to which is connected the inverter output, the slave network, as the main inverter applied voltage inverter, which includes the valve block with direct thyristor and the reverse diode bridge and the inlet filter with a sensor current direction, in addition, is introduced synchronized with the mains frequency and in phase with the load voltage control system rectifier, a separate control unit rectifier and inverter slave network, wherein the control inputs of the rectifier control system and slave network inverter connected to the output of the sensor network reactive power input control mode control unit separate rectifier and inverter driven network connected to the output of the sensor current direction, and its first and second outputs are connected to the enabling input control systems rectifier and inverter driven network, respectively.
The figure shows a functional diagram of the device to the level of the known elements.
 | The apparatus comprises a transformer 1, the main inverter 2, a voltage inverter, which includes a valve block 3 with direct thyristor and a reflux diode bridge and the input filter 4, the sensor current direction, synchronized with the network control system 5 phase main inverter output voltage relative to the supply voltage, rectifier 6 synchronized with the mains frequency and phase with the load voltage control system 7, driven by network inverter 8 with synchronized with the mains frequency and phase with the voltage of the network management system 9, assembly 10 separate control rectifier and inverter driven network, but also the sensor 11 deviations load voltage sensor 12 and network reactive power. |
Transformer-thyristor compensator voltage variations and reactive power is as follows. The output voltage of the device 
It is formed from the voltage 
and an adjustable voltage magnitude and phase K m 
Induced across the primary winding of the transformer 1, due to its power supply voltage of the secondary winding 
Being generated at the output of the main inverter 2.
The output voltage of the main inverter 2 in the mode and voltopribavleniya voltovychetaniya: 
Where 
u1 the angle between the primary voltage and current of the inverter 2; 
in, u1, u2 rectifier thyristor control angle 6, the main inverter 2 and inverter driven network, 8, respectively;
In K, K u1, u2 K transform coefficients rectifier 6, the main inverter and the inverter 2, the slave network 8, respectively;
F ( c) and F ( and 2) the transfer functions of the rectifier and inverter 6, the slave network 8, respectively.
With 1 transformer output voltage of the main inverter 2 decreases in the transformation factor K m times and, as a result of counter-inclusion of windings, is subtracted from the voltage As a result, an expression for the load voltage 
for the considered modes is as follows: 
where K n1 K · K in K u1 and n2 K · K u1 u2 conversion factors regenerative voltage thyristor converter with DC link (with bridge circuits of inverter and rectifier K ~ n1 n2 1 and K-1); 
short-circuit impedance of the transformer 1; 
generalized load current vector.
From the expressions (1) and (2) that the modulus and argument of the generalized vector load voltage can be adjusted by changing the steering angle u1 thyristor main inverter 2 and angle control a rectifier 6 (in voltopribavleniya mode) or the control angle u2 inverter slave network 4 (in voltovychetaniya mode). The angle change unit and in u2 is produced as a function of reactive power networks deviations from the zero level, and transmission control on a v2 by changing the polarity of current at the input of the main inverter 2, the change in the control angle u1 main inverter 2 regardless of the polarity of its input current is produced in the load voltage deviation function of a predetermined level, for example, equal to the rated voltage. The ability to load voltage vector control module allows you to align it with the voltage deviation in the network, but also with changes in the magnitude and nature of the load, and the possibility of independent regulation with a vector argument on to compensate for consumption of reactive power network.
Achieving the effect caused by the use of the device is only one transformer, and a rectifier 6 connected to the load in voltopribavleniya and inverter mode, the slave network, the network in voltovychetaniya mode.
This design lets you expand the range of adjustment or stabilize the output voltage at a constant and maximum possible angle advancing voltage voltage or extend the range of adjustment or compensation of the reactive power consumed by the network at a given range of input voltage variations, and full compensation of these deviations of the load voltage.
Expediency scope promenergobloki devices are the most common guild transformer substations with capacity of 400, 630 and 1000 KW.
USED BOOKS
1. Tolstov YG Autonomous power inverters. Energy M., 1978, p. 52-53. analogue.
2. Patent RF N 1793514, H 02 3/18 on 11/15/93 prototype.
CLAIM
Transformer-thyristor compensator voltage variations and reactive power, comprising a sensor of reactive power network and sensor deflection load voltage transformer with primary and secondary windings and the main inverter synchronized and phase-locked to the phase control system network of the main inverter output voltage relative to the supply voltage, the control input of which connected to the sensor output deviation of the load voltage and the inverter, the slave network with synchronized and phased with network management and a rectifier system, and a rectifier input connected to the load, and its output terminals are formed conclusions DC, which are connected to inputs of the main inverter and the inverter , driven network, the secondary winding of the transformer is connected into a star, and is connected to the output of the main inverter, and some of the findings of its primary winding connected to the load, characterized in that the other findings of the transformer primary winding is connected to a network to which an output of the inverter, the slave network, as main inverter applied voltage inverter, which includes a manifold with a direct thyristor and a reflux diode bridge and the input filter tow current direction, in addition, is introduced synchronized with the mains frequency and in phase with the load voltage control system of the rectifier, a separate control unit rectifier and inverter driven network, and the control inputs of the system control rectifier and the slave network inverter connected to the output of the sensor of reactive power network control input mode node separate control rectifier and inverter driven network connected to the output of the sensor current direction, and its first and second outputs are connected to the enabling input control systems rectifier and inverter driven network, respectively.
print version
Publication date 15.02.2007gg
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