CN207705809U - A kind of activation system for large-scale phase modifier - Google Patents

Abstract

The utility model discloses one kind for large-scale phase modifier activation system, wherein high-pressure system busbar connects phase modifier by the first breaker；Phase modifier passes through axis connection motor；Medium voltage network busbar passes sequentially through the second breaker and connects motor with frequency converter, to motor.The utility model is used adjusts phase modifier grid-connected conditions by the motor drive phase modifier rotation coaxial with phase modifier, Frequency Converter Control, completes the start-up course of phase modifier.

Description

A kind of activation system for large-scale phase modifier

Technical field

The utility model belongs to system wiring field, and in particular to a kind of activation system for large-scale phase modifier.

Background technology

Phase modifier is that the synchronous motor under a kind of special operating status can be according to system when applied to electric system It needs, automatically increases idle output when network voltage declines, the absorbing reactive power when network voltage rises, to maintain electricity Pressure improves the stability of electric system, improves system power supply quality.Synchronous motor runs on electric motor state, negative without machinery It carries without prime mover, only to electric system offer or absorbing reactive power.Phase modifier is maintained for improving power factor of electric network Voltage level of power grid.

Guo Wang companies are used for the phase modifier of current conversion station at present, and Starting mode is all made of frequency converter (SFC) and starts scheme.Start When, electric energy is supplied to phase modifier, phase modifier to start to rotate under the dragging of phase modifier by power grid through frequency converter, rotary speed by Frequency converter adjusting control.Frequency converter gradually increases the rotating speed of phase modifier, (is more than 3000 when rising to given rotating speed by zero-turn speed Revolutions per second), frequency converter is out of service, phase modifier running down operation.In the phase modifier running down stage, voltage, frequency and the phase with power grid Angular difference can not be adjusted or intervene.When synchronous device detects that phase modifier has grid-connected conditions at a certain moment, phase modulation Machine outlet breaker closes a floodgate, the grid-connected electrification of phase modifier, with motor-operation, to power grid offer or absorbing reactive power.If Simultaneous interconnecting condition is can't detect, then is again introduced into startup link after frequency converter cooling.This phase modifier Starting mode exists Following disadvantage：(1) in the simultaneous interconnecting stage, grid-connected conditions can not be adjusted or intervene, and randomness is very big, and there is the same periods The possibility of grid-connected failure；(2) window phase of simultaneous interconnecting is very of short duration, it is difficult to capture same period condition；(3) it is opened for phase modifier Dynamic frequency converter rated power is very big, and it is expensive；(4) if startup failure, ability after the cooling completely of waiting frequency converter is needed It can be again started up, the flexibility of startup is poor；(5) it is unsuccessfully again started up if started, expends electric energy, be unfavorable for energy-saving.

Utility model content

The purpose of this utility model is to provide a kind of activation systems for large-scale phase modifier, to solve currently used for big The shortcomings that type phase modifier starts problem.This programme has the function of actively adjusting or intervene same period condition, simultaneous interconnecting success Rate is very high, flexible operation, for quickly putting into operation for phase modifier, provides condition.

To achieve the goals above, the utility model adopts the following technical solution：

A kind of activation system for large-scale phase modifier, including high-pressure system busbar, phase modifier, motor, frequency converter and Medium voltage network busbar；Wherein, high-pressure system busbar and phase modulation mechatronics；Phase modifier is connect by axis with motor, and by electricity Motivation drags phase modifier rotation；Motor is electrically connected with frequency converter, and frequency converter is electrically connected with medium voltage network busbar.

For high-pressure system busbar by the first breaker and phase modulation mechatronics, phase modifier provides to high-pressure system or absorbs nothing Work(power.

Frequency converter is electrically connected by the second breaker with medium voltage network busbar, is used for motor.

Phase modifier is coaxially connected with motor.

Compared with the existing technology, the utility model has the advantages that：

This programme proposes one large-scale phase modifier activation system, using motor starting system, by coaxial with phase modifier The motor of installation, dragging phase modifier startup is grid-connected, and motor is by inverter supply.With previous passive waiting same period window phase It compares, this programme has the function of actively adjusting or intervene same period condition, and simultaneous interconnecting success rate is very high, flexible operation, For quickly putting into operation for phase modifier, condition is provided.The rated power of electric motor frequency converter, also far smaller than phase modifier frequency converter Rated power, equipment investment reduce.Specific advantage is as follows：

1, using motor start-up technology, for the activation system of large-scale phase modifier, have and actively adjust or intervene together The function of phase condition.Simultaneous interconnecting includes three conditions：Voltage magnitude, frequency and phase angle difference.This programme can actively adjust or Intervene simultaneous interconnecting condition so that phase modifier can have grid-connected same period condition in a short time, grid-connected rapid, to adjust electric power The reactive power of system, creates condition.

2, using motor start-up technology, for the activation system of large-scale phase modifier, equipment investment can be reduced.Motor The rated power of frequency converter, the far smaller than rated power of phase modifier frequency converter, equipment investment reduce.

3, using motor start-up technology, for the activation system of large-scale phase modifier, what is avoided must not due to starting failure Without multiple restarting, save operating cost.

Description of the drawings

Fig. 1 is the utility model electrical principle wiring schematic diagram.

Specific implementation mode

The utility model is described in further detail below in conjunction with the accompanying drawings：

Referring to Fig. 1, it is a kind of using motor start-up technology, for the activation system of large-scale phase modifier, including high pressure system System busbar 1, the first breaker 2, phase modifier 3, header box 3, axis 4, motor 5, frequency converter 6, the second breaker 7 and medium voltage network Busbar 8；Wherein, high-pressure system busbar 1 connects phase modifier 3 by the first breaker 2；Phase modifier 3 connects motor 5 by axis 4； Medium voltage network busbar 8 passes sequentially through the second breaker 7 and frequency converter 6 connects motor 5, powers to motor 5.

The application method of the utility model is as follows：

First breaker 2 is in tripped condition, and the second breaker 7 is in "on" position.Medium voltage network busbar 8 passes sequentially through Second breaker 7 and frequency converter 6 are powered to motor 5.Motor 5 connects phase modifier 3, the rotation of 5 drive shaft 4 of motor by axis 4 Turn, axis 4 drives phase modifier 3 to rotate.Under the control and regulation of frequency converter 6, phase modifier 3 has rapidly simultaneous interconnecting condition.Second Breaker 7 is in "on" position, while frequency converter 6 turns off, and completes 3 start-up course of phase modifier.

The utility model use motor starting system, by with the coaxial mounted motor of phase modifier, dragging phase modifier open Dynamic grid-connected, motor is by inverter supply.Compared with previous passive waiting same period window phase, this programme, which has, actively to be adjusted Or intervene the function of same period condition, simultaneous interconnecting success rate is very high, flexible operation, for quickly putting into operation for phase modifier, provides Condition.The rated power of electric motor frequency converter, also far smaller than the rated power of phase modifier frequency converter, equipment investment reduce.

It, cannot the above content is specific preferred embodiment further detailed description of the utility model is combined Assert that specific embodiment of the present utility model is only limitted to this, for the utility model person of an ordinary skill in the technical field For, without departing from the concept of the premise utility, several simple deduction or replace can also be made, all should be considered as Belong to the utility model and determines scope of patent protection by the claims submitted.

Claims (4)

1. a kind of activation system for large-scale phase modifier, it is characterised in that：Including high-pressure system busbar (1), phase modifier (3), Motor (5), frequency converter (6) and medium voltage network busbar (8)；Wherein, high-pressure system busbar (1) is electrically connected with phase modifier (3)；It adjusts Camera (3) is connect by axis (4) with motor (5), and is rotated by motor (5) dragging phase modifier (3)；Motor (5) and change Frequency device (6) is electrically connected, and frequency converter (6) is electrically connected with medium voltage network busbar (8).

2. a kind of activation system for large-scale phase modifier according to claim 1, it is characterised in that：The high pressure system System busbar (1) be electrically connected with phase modifier (3) by the first breaker (2), phase modifier (3) to high-pressure system busbar (1) offer or Absorbing reactive power.

3. a kind of activation system for large-scale phase modifier according to claim 1, it is characterised in that：The frequency converter (6) it is electrically connected with medium voltage network busbar (8) by the second breaker (7), for powering to motor (5).

4. a kind of activation system for large-scale phase modifier according to claim 1, it is characterised in that：The phase modifier (3) with motor (5) is coaxial is connected.