CN201393070Y - Low-voltage reactive power comprehensive compensation device - Google Patents

Abstract

The utility model relates to a low-voltage reactive-power comprehensive compensation device, which comprises a primary main circuit and a secondary control loop, wherein the primary main circuit comprises a co-compensation loop; for the co-compensation loop, a three-phase capacitor is connected into the delta shape and then is connected into an outgoing line end of a combination switch FK1; and an ingoing line end of the combination switch FK1 is connected with a three-phase power supply; the primary main circuit also comprises an individual compensation loop; for the individual compensation loop, a three-phase capacitor is connected into the 'Y' shape and then is connected into an outgoing line end of a combination switch FK2; and an ingoing line end of the combination switch FK2 is connected with a three-phase power supply. The device can solve the problem of over compensation or under compensation caused by co-compensation in the prior art, and the device has the advantages that the individual compensation is carried out after the co-compensation by combining the co-compensation and the individual compensation; the energy consumption is lowered; and the requirement is met.

Description

Low-voltage reactive power comprehensive compensation device

technical field

The utility model relates to a low-voltage reactive power comprehensive compensation device.

Background technique

Due to the influence of factors such as the power factor and use of the electrical equipment itself, the power factor of the power grid is reduced, and reactive power compensation must be carried out to improve the power supply quality of the power grid. Most of the existing reactive power compensation adopts the method of co-complementation. As long as one item needs to be compensated in this compensation method, the three items must be compensated, and the phenomenon of overcompensation will occur. The voltage is too high, which cannot improve the grid Power factor requirements, and energy consumption; or as long as one of the collected items does not need to be compensated, and the three items are not compensated, there will be a phenomenon of undercompensation, the power factor is low, and the voltage is low, which cannot improve the power grid. power factor requirements.

Contents of the invention

In order to overcome the problems in the background technology, the purpose of this utility model is to provide a low-voltage reactive power comprehensive compensation device which combines common compensation and separate compensation.

The technical solution of the utility model:

The low-voltage reactive power comprehensive compensation device includes a primary main circuit and a secondary control circuit. The primary main circuit includes a common compensation circuit. The common compensation circuit is a three-phase capacitor connected in a "△" shape and connected to the outlet of the compound switch FK1 , the incoming line of the composite switch FK1 is connected to a three-phase power supply; its special feature is that: the primary main circuit also includes a sub-compensation circuit, and the sub-compensation circuit is a three-phase capacitor connected in a "Y" shape to connect to the composite switch FK2 The outgoing line terminal of the composite switch FK2 is connected to the three-phase power supply. Wherein the secondary control loop comprises a capacitance compensation controller xyJKFF, a composite switch FK and three sampling current transformers 1LHa, 1LHb, 1LHc, the signal output terminal of the capacitance compensation controller xyJKFF is connected to the control node of the composite switch FK; The signal input terminal of the compensation controller xyJKFF is connected with three sampling current transformers 1LHa, 1LHb, 1LHc. The common compensation circuit and sub-compensation circuit of the above-mentioned primary main circuit are respectively connected in series with fuse RD1 and fuse RD2. The upper port of the fuse RD1 is connected to the three-phase power supply, and the lower port of the fuse RD1 is connected to the incoming terminal of the compound switch FK1. , the upper port of the fuse RD2 is connected to the three-phase power supply, and the lower port of the fuse RD2 is connected to the incoming terminal of the composite switch FK2.

The above-mentioned co-complementary circuits and sub-complementary circuits are multiple, which can be freely matched.

For example: there are 6 circuits for the common compensation circuit, and 2 circuits for the divided compensation circuit; 6 circuits for the common compensation circuit, and 1 circuit for the divided compensation circuit; 3 circuits for the common compensation circuit, and 3 routes for the divided compensation circuit.

Compared with the prior art, the utility model has the following advantages:

1. The utility model measures the system voltage and load current, controls it with an industrial PC or a single-chip microcomputer, calculates the reactive power of the load as the control quantity, obtains the data of the thyristor switch being closed or disconnected, and controls the corresponding thyristor switch, Adopt the compensation method combining common compensation and sub-compensation, put in a capacitor bank with appropriate capacity, first co-compensate and then sub-compensate according to needs, reduce energy consumption, meet the requirements, and avoid some phase undercompensation and some phase overcompensation Compensation, suitable for civil, construction, industrial and mining industries, with a wider range of applications.

2. The utility model adopts a composite switch with high compensation precision, automatic intelligent tracking detection and control, energy-saving optimization management function, equal-voltage zero-current input, current zero-crossing cut-off, no operating overvoltage, small inrush current, and low energy consumption; With abnormal voltage protection, phase loss protection and other functions.

3. When the capacitor of the present invention is put into use, there is no impact current, so that the compensation effect is fast, accurate and safe. The device of the present invention has low cost, high reliability and relatively small maintenance workload.

Description of drawings

Fig. 1 is a schematic diagram of the primary main circuit of the utility model;

Fig. 2 is a system diagram of the utility model.

Detailed ways

As shown in Figure 1, it is a circuit diagram of the present utility model, the low-voltage reactive power comprehensive compensation device includes a primary main circuit and a secondary control circuit, the primary main circuit includes a common compensation circuit, and the common compensation circuit is a three-phase capacitor connection It is connected to the outlet end of the compound switch FK1 in a "△" shape, and the incoming line terminal of the compound switch FK1 is connected to the three-phase power supply; the primary main circuit also includes a sub-compensation circuit, and the sub-compensation circuit is a three-phase capacitor connected to "Y" ”shape connected to the outgoing terminal of the composite switch FK2, and the incoming terminal of the composite switch FK2 is connected to the three-phase power supply. The common compensation circuit and sub-compensation circuit of the primary main circuit are connected in series with fuse RD1 and fuse RD2 respectively, the upper port of the fuse RD1 is connected to the three-phase power supply, and the lower port of the fuse RD1 is connected to the incoming line of the compound switch FK1 terminal, the upper port of the fuse RD2 is connected to the three-phase power supply, and the lower port of the fuse RD2 is connected to the incoming terminal of the composite switch FK2. The secondary control loop comprises a capacitance compensation controller xyJKFF, a composite switch FK and three sampling current transformers 1LHa, 1LHb, 1LHc, and the signal output terminal of the capacitance compensation controller is connected to the control node of the composite switch FK; The signal input terminal of the compensation controller xyJKFF is connected with three sampling current transformers 1LHa, 1LHb, 1LHc.

The co-complementary circuit and the sub-complementary circuit are multiple, which can be combined and matched at will;

For example, there are 6 circuits in the total compensation circuit, and 2 circuits in the sub-compensation circuit; there are 6 circuits in the total compensation circuit, and 1 circuit in the sub-compensation circuit; 3 circuits in the total compensation circuit, and 3 circuits in the distribution circuit wait.

Working process of the present utility model:

The capacitance compensation controller samples the three-phase current on the transformer and the three-phase voltage signal on the main line. According to the change of reactive power of each phase, the capacitor compensation controller takes reactive power as the control physical quantity, and transmits the signal to the compound switch. The compound switch makes corresponding actions according to the received signal, supplementing or not. Closed, with the power factor set by the user as the limit of switching parameters, according to the size of the reactive power of each phase in the three phases of the power distribution device, intelligently select the capacitor combination to automatically and timely compensate the reactive power capacity, according to "sampling to complete" According to the principle, it is put into the power grid to realize the intelligent switching of capacitors; if the composite switch receives the signal that the capacitor compensation controller does not compensate, the composite switch will execute the information instruction and cut off directly.

The utility model adopts the compensation method combining three-phase co-compensation and single-phase separate compensation, uses intelligent reactive power control as the strategy, collects three-phase voltage and current signals, tracks the change of reactive power in the device, and uses reactive power as the control Physical quantity, with the power factor set by the user as the limit of switching parameters, according to the size of the reactive power of each phase in the three phases of the power distribution device, intelligently select the capacitor combination to automatically and timely compensate the reactive power capacity, according to "sampling to complete" According to the principle, it is put into the power grid to realize the intelligent switching of capacitors.

Claims (7)

1, low-voltage reactive power comprehensive compensating device, comprise main circuit and secondary control loop, a described main circuit comprises and refills the road altogether that the described road that refills altogether is that three phase capacitance is connected into the leading-out terminal that " △ " shape is inserted combination switch FK1, the inlet wire termination three phase mains of combination switch FK1; It is characterized in that: a described main circuit comprises that also branch refills the road, and it is that three phase capacitance is connected into the leading-out terminal that " Y " shape is inserted combination switch FK2, the inlet wire termination three phase mains of combination switch FK2 that described branch is mended circuit.

2, low-voltage reactive power comprehensive compensating device according to claim 1, it is characterized in that: described secondary control loop comprises capacitance compensation controller xyJKFF, combination switch FK and three sample rate current instrument transformer 1LHa, 1LHb, 1LHc, and the signal output part of described capacitance compensation controller xyJKFF connects the Control Node of combination switch FK; The signal input part of described capacitance compensation controller xyJKFF meets three sample rate current instrument transformer 1LHa, 1LHb, 1LHc.

, low-voltage reactive power comprehensive compensating device according to claim 1, it is characterized in that: described road and the branch of refilling altogether refills the road and is a plurality of.

, low-voltage reactive power comprehensive compensating device according to claim 2, it is characterized in that: the described road that refills altogether is 6 roads, and it is 2 roads that described branch refills the road.

Low-voltage reactive power comprehensive compensating device according to claim 2 is characterized in that: the described road that refills altogether is 6 roads, and it is 1 road that described branch refills the road.

, low-voltage reactive power comprehensive compensating device according to claim 2, it is characterized in that: the described road that refills altogether is 3 roads, and it is 3 roads that described branch refills the road.

, according to claim 1 or 2 or 3 or 4 or 5 described low-voltage reactive power comprehensive compensating devices, it is characterized in that: refill altogether road and the branch of a described major loop refill and are serially connected with fuse RD1, fuse RD2 in the road respectively, described fuse RD1 upper port connects three phase mains, the lower port of fuse RD1 connects combination switch FK1 end of incoming cables, described fuse RD2 upper port connects three phase mains, and the lower port of fuse RD2 connects combination switch FK2 end of incoming cables.

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