CN102354996B - Control system and control method based on MCR (magnetic control reactor) dynamic reactive power compensation and soft start - Google Patents
Control system and control method based on MCR (magnetic control reactor) dynamic reactive power compensation and soft start Download PDFInfo
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Abstract
The invention relates to a control system and a control method based on MCR (magnetic control reactor) dynamic reactive power compensation and soft start, and the control system and the control method are applied to soft start of a high-voltage motor and reactive power compensation of a power grid. The control system comprises a monitoring system, a main control system, a power supply unit, a soft start operation panel, a changeover switch control unit, an MCR excitation unit and a measurement and control protective unit; the monitoring system comprise an industrial computer and a display unit; the main control system comprises a communication unit and a CPU (central processing unit) control unit; the MCR excitation unit comprises an optoelectronic interface of the MCR excitation unit, a drive amplifier circuit and a silicon controlled rectifier; the communication unit is connected with the monitoring system and the changeover switch control unit; the optoelectronic interface of the main control system is connected with the optoelectronic interface of the MCR excitation unit; and a sampling unit is connected with a PT (potential transformer) and a CT (current transformer) under the bus of the power grid system. The control system and the control method provided by the invention have the advantages that multiple functions are realized and equipment cost and running cost are reduced synchronously through the soft start of the high-voltage motor and the reactive dynamic adjustment of the power grid, the area occupied by the equipment is reduced, the structure is simple, the operation and maintenance are simple, the performance is good, stable and reliable, and the utilization rate is high.
Description
Technical field
The present invention relates to, based on MCR dynamic passive compensation hold concurrently control system and the control method of soft start, be applicable to high-voltage motor soft start and electric network reactive compensation, be specially adapted to electric power, metallurgy, mine, oil field high-voltage motor soft start and electric network reactive compensation.
Background technology
AC motor application is extensive.In most of occasion, motor does not need speed governing, but high-voltage large-capacity electric motor starting is very large to electrical network impact, causes voltage fluctuation, and other equipment are under-voltage, and operation harmful effect is produced; Large to electromechanical shock, cause the aging even mouse cage of military aid section bar, shorten motor useful life; Large to mechanical transmission component shaft coupling, this roller box belt and driven load shock, cause the shortening in useful life of these parts.
At present, common high-voltage asynchronous motor starting method: stator loop series reactor, liquid resistance, common saturable reactor, controllable silicon etc.Series reactor is stepped starting, and startability is poor, and spin loss is large, has secondary pulse, and noise is large; Liquid resistance floor space is large, and maintenance is large, and energy consumption is higher, and startability is fixed, and cannot regulate, and starting characteristic is closely bound up with ambient temperature, very responsive to ambient temperature; Common saturable reactor control performance meets reactor, its reactor has wider adjustable range, can overcome series reactor and start the problem existing, unfailing performance is high, large startup noise is large, can reach 80-90dB, even higher, and the startup auxiliary power unit of large content volume need to be provided.Because energized circuit and major loop separate, the startup occasion in short-term operation, has certain potential safety hazard; The adjusting that serial connection controllable silicon is realized motor terminal voltage reaches the object of soft start, is desirable Starting mode theoretically, but in high pressure occasion, due to needs high-voltage thyristor, unfailing performance is difficult to obtain assurance, and maintenance is large, and price is high.
Power system reactive power balance is most important to improving the whole network economic benefit and improving power supply quality, along with the development of High Power Active device and control technology, the reactive power compensation of instantaneity is achieved, and the quality of power supply is well improved.SVC is usingd and in recent years in international and domestic power supply, electricity consumption, is promoted as maturity product.
At present, prior art SVC dynamic passive compensation mainly contains two kinds: a kind of TCR of being Controlled Reactor SVC, be characterized in that response is fast, and technology maturation, but cannot break away from the inherent shortcoming that posture is difficult to overcome: reliability and stability is not high, maintenance is large; Equipment is complicated, cost is high; Bulky, increase floor space, construction cost is high.A MCR magnet controlled reactor SVC, its feature: noise is little, harmonic wave is little, loss is low, fast response time, security of operation, life-span is long, non-maintaining etc., but prior art function singleness, do not have and automatically carry out the dynamic passive compensation function of soft start of holding concurrently, do not there is the reactive power compensation control system of soft start of holding concurrently, thereby in performance, manufacture and operating cost, utilance, the equal Shortcomings of floor space and operating aspect.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of based on MCR dynamic passive compensation hold concurrently control system and the control method of soft start, be that MCR can realize dynamic passive compensation and regulates and also can realize the control system of high-voltage motor soft start, system when being not activated instruction in dynamic passive compensation pattern, when receiving enabled instruction, in soft-start mode, after completing, start-up performance automatically restores to reactive power compensation state.The present invention reduces occupation area of equipment, realizes multi-functional input and the operating cost that simultaneously reduces equipment, simple in structure, simple and convenient operation and maintenance, and performance is good, and reliable and stable, and utilance is high.
For achieving the above object, the present invention is achieved through the following technical solutions:
Based on the MCR dynamic passive compensation control system for soft start of holding concurrently, it comprises supervisory control system, master control system, power supply unit, soft start operation panel, diverter switch control unit, MCR excitation unit and monitoring and protection unit; Described supervisory control system comprises industrial computer, display unit; Described master control system comprises the optic electric interface of communication unit, CPU control unit, sampling unit, input-output unit, master control system; Described MCR excitation unit comprises optic electric interface, pulsed triggering circuit, drive amplification circuit and the controllable silicon of MCR excitation unit; Described communication unit is connected with supervisory control system, diverter switch control unit, monitoring and protection unit; Described power supply unit connects each building block ，Wei Ge working cell provides working power; Described soft start operation panel connects input-output unit; The optic electric interface of described master control system connects the optic electric interface of MCR excitation unit; Described sampling unit connects PT and the CT under network system bus; Described monitoring and protection unit is also connected with CT with the PT of MCR branch road and FC branch road with switch cubicle; MCR is magnetic valve type saturable reactor.
On the basis of technique scheme, further technical scheme is:
Described based on the MCR dynamic passive compensation control system of soft start of holding concurrently, the controllable silicon of its MCR excitation unit is connected with the control winding of MCR, for realizing: the optic electric interface circuit when MCR excitation unit receives after the light signal of master control system, through opto-electronic conversion, trigger pulse circuit, signal shaping, amplify the trigger impulse of the thyristor operating angle that forms MCR excitation unit, silicon controlled conducting state is carried out to phase shifting control, the electric current of dynamic adjustments MCR, realizes the soft start of motor M and reactive power compensation is carried out in the idle adjusting of perception under network system bus.
Described based on the MCR dynamic passive compensation control system of soft start of holding concurrently, its diverter switch control unit connects soft start unit switch K2 and operation unit switch K3 and compensating switch Kb.
A kind of control system based on the soft start of holding concurrently with MCR dynamic passive compensation of the present invention is carried out the high-voltage motor reactive power compensation control method of soft start of holding concurrently, it has soft start program and reactive power compensation program, and soft start process priority, in reactive power compensation program, automatically proceeds to reactive power compensation program after soft start EP (end of program); Concrete control method comprises the steps:
A, send enabled instruction: by soft start operation panel or supervisory control system, to master control system, send enabled instruction;
B, soft start program are opened: master control system is received after enabled instruction, forwards immediately soft start program to; The steps include:
A, diverter switch control unit send control signal makes corresponding starting combined switch K2 closed;
B: starting current is controlled: master control system is sent the SCR Trigger Angle of soft start program to MCR excitation unit, make MCR reactance value reach from big to small entry condition.
C, open or close respective switch: when MCR reactance value reaches entry condition from big to small, diverter switch control unit 5 sends corresponding operation unit switch K3 close command, and diverter switch control unit sends control signal disconnects corresponding starting combined switch K2;
D, on off state are confirmed: master control system confirms that whether the state of each switch is correct, and incorrect warning, after confirming correctly, starts to enter reactive power compensation program;
E, reactive power compensation program are opened: the steps include:
A, diverter switch control unit send control signal makes compensating switch Kb closed;
B, electric current, voltage detecting: the signal of the PT under network system bus, CT is gathered by sampling unit;
C, reactive power are calculated: by master control system, calculate the required compensating power of network system;
D, MCR excitation unit receive Trigger Angle light signal: by master control system optic electric interface, send in real time required reactive power SCR Trigger Angle light signal to MCR excitation unit;
F, MCR work, realizes reactive power compensation under the soft start of the motor under soft start program and the network system bus under reactive power compensation program and regulates, and balance sysmte is idle;
When receiving soft start instruction, G, master control system carry out by steps A, B, C, D, E, F.
Further technical scheme is:
The described control system based on the soft start of holding concurrently with MCR dynamic passive compensation is carried out the high-voltage motor reactive power compensation control method of soft start of holding concurrently, under soft start program: master control system is sent SCR Trigger Angle, and to make MCR reactance value be that the starting current of motor main circuit reaches entry condition from small to large from big to small to MCR excitation unit.
The invention has the advantages that, be applicable to the soft start of high-voltage motor simultaneously to electric network reactive-load dynamic adjustments, make full use of the function of MCR, realize multi-functional equipment investment and the operating cost of simultaneously reducing, reduce occupation area of equipment, simple in structure, simple and convenient operation and maintenance, performance is good, and reliable and stable, and utilance is high.
Accompanying drawing explanation
Fig. 1 the present invention is based on the hold concurrently control system schematic diagram of soft start of MCR dynamic passive compensation.
Fig. 2 is the present invention's MCR magnetic valve type used saturable reactor schematic diagram.
Fig. 3 is that the present invention can realize many high-voltage motors startup switchings and reactive power compensation changing-over combined switching schematic diagram.
Fig. 4 the present invention is based on the hold concurrently control system control method schematic diagram of soft start of MCR dynamic passive compensation.
Embodiment
Below in conjunction with drawings and Examples, product technology scheme of the present invention is described further.
embodiment 1:
As shown in drawings, a kind of based on the MCR dynamic passive compensation control system of soft start of holding concurrently, it comprises supervisory control system 1, master control system 2, power supply unit 3, soft start operation panel 4, diverter switch control unit 5, MCR excitation unit 6 and monitoring and protection unit 7; Described supervisory control system 1 comprises industrial computer, display unit; Described master control system 2 comprises the optic electric interface 2.5 of communication unit 2.1, CPU control unit 2.2, sampling unit 2.3, input-output unit 2.4, master control system; Described MCR excitation unit 6 comprises optic electric interface, pulsed triggering circuit, drive amplification circuit and the controllable silicon of MCR excitation unit; Described communication unit 2.1 is connected with supervisory control system 1, diverter switch control unit 5, monitoring and protection unit 7; Described power supply unit 3 connects each building block ，Wei Ge working cell provides working power; Described soft start operation panel 4 connects input-output unit 2.4; The optic electric interface 2.5 of described master control system connects the optic electric interface of MCR excitation unit; PT and CT that described sampling unit 2.3 connects under network system bus; Described monitoring and protection unit 7 is also connected with CT with the PT of MCR branch road and FC branch road with switch cubicle; MCR is magnetic valve type saturable reactor.The controllable silicon of described MCR excitation unit 6 is connected with the control winding of MCR, for realizing: the optic electric interface circuit when MCR excitation unit receives after the light signal of master control system 2, through opto-electronic conversion, trigger pulse circuit, signal shaping, amplify the trigger impulse of the thyristor operating angle that forms MCR excitation unit 6, silicon controlled conducting state is carried out to phase shifting control, the electric current of dynamic adjustments MCR, realizes the soft start of motor M and reactive power compensation is carried out in the idle adjusting of perception under network system bus.Described diverter switch control unit 5 connects soft start unit switch K2 and operation unit switch K3 and compensating switch Kb.
To structure of the present invention, principle and effect, further illustrate as follows:
Supervisory control system set-up function comprises: reactive compensation power factor is set, and soft start switching circuit arranges; System Presentation Function: software interface shows dynamic passive compensation state, compensation rate, system power factor, primary connection figure, on off state, present mode, alarm output; Host computer Remote Visit and Control function: as WEB issue, for local area network (LAN) or Internet user provide telemanagement and access.Master control system is control system core, under reactive power compensation pattern: by sampling unit, network system system PT, CT are sampled, obtain out Trigger Angle after computing; Under soft-start mode: master control system receives the enabled instruction that soft start operation panel, host computer, Long-distance Control send, by diverter switch control unit, to switch corresponding to changing-over combined switching loop, send control signal, master control system is sent soft start Trigger Angle to MCR excitation unit simultaneously;
As shown in Figure 2: MCR is magnetic valve type saturable reactor, the control winding Nk of MCR connects the controllable silicon of MCR magnetic control unit 6, the optic electric interface circuit of MCR magnetic control unit receives after the light signal of master control system 2, through opto-electronic conversion, trigger pulse circuit, signal shaping, amplify the trigger impulse that forms thyristor operating angle, silicon controlled conducting state is carried out to phase shifting control, the electric current of dynamic adjustments MCR, realizes the soft start of motor M and reactive power compensation is carried out in the idle adjusting of perception under network system bus 6.
MCR has the reactor of multiple area in a kind of iron core, the part that sectional area is less is called as magnet valve, and magnet valve part can regulate continuously in limit saturation region, and the induction reactance of MCR can be changed on a large scale continuously.MCR is comprised of four column iron cores and winding, and middle two iron cores are work iron core, and Nk is for controlling winding, and N is Working winding.Because controllable silicon is connected to, control on winding, its voltage is very low, is about 1% ~ 3% of system rated voltage, and reliability of operation improves greatly.When Working winding N two ends connect alternating voltage U, control on winding Nk and will induce corresponding voltage, in the positive half cycle controllable silicon T1 of voltage conducting, the negative half period controllable silicon T2 conducting of voltage, the angle of flow by control controllable silicon T1, controllable silicon T2 is big or small, thereby can control the magnetic permeability of the size control work iron core of DC excitation, realizes reactance value and obtains continuously adjustable, realize the constant current soft start of high-voltage motor, realize dynamic reactive and regulate.
As shown in Figure 3, diverter switch control unit 5 output control signals connect soft start unit switch K2, operation unit switch K3 and compensating switch Kb reactive power compensation group switch,
Motor M 1 is started: primary cut-out receives the closure signal of control system, starting switch K2.1 is closed, magnetic control unit receives master control system the Trigger Angle signal of controllable silicon T1 and controllable silicon T2 is carried out to excitation regulation, loop reactance is changed from high to low, thereby make motor reach constant current soft start, the closed start-up course of run switch K3.1 finishes, and compensating switch Kb is closed, and MCR proceeds to SVC dynamic passive compensation loop automatically; The process that M2 is started and Mn is started starts identically with above-mentioned to motor M 1, difference is each own corresponding switch.
Below in conjunction with drawings and Examples, the inventive method technical scheme is described further.
embodiment 2
As shown in Figure 4, a kind of control system based on the soft start of holding concurrently with MCR dynamic passive compensation is carried out the high-voltage motor reactive power compensation control method of soft start of holding concurrently, it has soft start program and reactive power compensation program, and soft start process priority, in reactive power compensation program, automatically proceeds to reactive power compensation program after soft start EP (end of program); Concrete control method step is:
A, send enabled instruction: by soft start operation panel 4 or supervisory control system 1, to master control system 2, send enabled instruction;
B, soft start program are opened: master control system 2 is received after enabled instruction, forwards immediately soft start program to; The steps include:
A, diverter switch control unit 5 send control signal makes corresponding starting combined switch K2 closed;
B: starting current is controlled: master control system 2 is sent the SCR Trigger Angle of soft start program to MCR excitation unit 6, make MCR reactance value reach from big to small entry condition.
C, open or close respective switch: when MCR reactance value reaches entry condition from big to small, diverter switch control unit 5 sends corresponding operation unit switch K3 close command, and diverter switch control unit 5 sends control signal disconnects corresponding starting combined switch K2;
D, on off state are confirmed: master control system 2 confirms that whether the state of each switch is correct, and incorrect warning, after confirming correctly, starts to enter reactive power compensation program;
E, reactive power compensation program are opened: the steps include:
A, diverter switch control unit 5 send control signal makes compensating switch Kb closed; B, electric current, voltage detecting: by the PT under 2.3 pairs of network system buses of sampling unit, the signal of CT, gathered;
C, reactive power are calculated: by master control system, calculate the required compensating power of network system;
D, MCR excitation unit receive Trigger Angle light signal: by master control system optic electric interface 2.5, send required reactive power SCR Trigger Angle light signal in real time to MCR excitation unit 6;
F, MCR work, realizes reactive power compensation under the soft start of the motor under soft start program and the network system bus under reactive power compensation program and regulates, and balance sysmte is idle;
When receiving soft start instruction, G, master control system 2 carry out by steps A, B, C, D, E, F.
Under soft start program: master control system 2 is sent SCR Trigger Angle, and to make MCR reactance value be that the starting current of motor main circuit reaches entry condition from small to large from big to small to MCR excitation unit 6.
Claim protection range of the present invention is not limited to above-described embodiment.
Claims (2)
1. one kind based on the MCR dynamic passive compensation control system of soft start of holding concurrently, it is characterized in that, it comprises supervisory control system (1), master control system (2), power supply unit (3), soft start operation panel (4), diverter switch control unit (5), MCR excitation unit (6) and monitoring and protection unit (7); Described supervisory control system (1) comprises industrial computer, display unit; Described master control system (2) comprises the optic electric interface (2.5) of communication unit (2.1), CPU control unit (2.2), sampling unit (2.3), input-output unit (2.4), master control system; Described MCR excitation unit (6) comprises optic electric interface, pulsed triggering circuit, drive amplification circuit and the controllable silicon of MCR excitation unit; Described communication unit (2.1) is connected with supervisory control system (1), diverter switch control unit (5), monitoring and protection unit (7); Described power supply unit (3) connects each building block ，Wei Ge working cell provides working power; Described soft start operation panel (4) connects input-output unit (2.4); The optic electric interface of described master control system (2.5) connects the optic electric interface of MCR excitation unit; Described sampling unit (2.3) connects PT and the CT under network system bus; Described monitoring and protection unit (7) is also connected with CT with the PT of MCR branch road and FC branch road with switch cubicle; MCR is magnetic valve type saturable reactor; The controllable silicon of MCR excitation unit (6) is connected with the control winding of MCR, for realizing: the optic electric interface circuit when MCR excitation unit receives after the light signal of master control system (2), through opto-electronic conversion, trigger pulse circuit, signal shaping, amplify the trigger impulse of the thyristor operating angle that forms MCR excitation unit (6), silicon controlled conducting state is carried out to phase shifting control, the electric current of dynamic adjustments MCR, realizes the soft start of motor M and reactive power compensation is carried out in the idle adjusting of perception under network system bus; Diverter switch control unit (5) connects soft start unit switch (K2) and operation unit switch (K3) and compensating switch (Kb).
2. the control system based on the soft start of holding concurrently with MCR dynamic passive compensation is carried out the high-voltage motor reactive power compensation control method of soft start of holding concurrently, it is characterized in that, it has soft start program and reactive power compensation program, and soft start process priority, in reactive power compensation program, automatically proceeds to reactive power compensation program after soft start EP (end of program); Concrete control method comprises the steps:
A, send enabled instruction: by soft start operation panel (4) or supervisory control system (1), to master control system (2), send enabled instruction;
B, soft start program are opened: master control system (2) is received after enabled instruction, forwards immediately soft start program to; The steps include:
A, diverter switch control unit (5) send control signal and make corresponding soft start unit switch (K2) closure;
B: starting current is controlled: master control system (2) is sent the SCR Trigger Angle of soft start program to MCR excitation unit (6), make MCR reactance value reach from big to small entry condition;
C, open or close respective switch: when MCR reactance value reaches entry condition from big to small, diverter switch control unit (5) sends corresponding operation unit switch (K3) close command, and diverter switch control unit (5) sends control signal disconnects corresponding soft start unit switch (K2);
D, on off state are confirmed: master control system (2) confirms that whether the state of each switch is correct, and incorrect warning, after confirming correctly, starts to enter reactive power compensation program;
E, reactive power compensation program are opened: the steps include:
A, diverter switch control unit (5) send control signal and make compensating switch (Kb) closure; B, electric current, voltage detecting: the signal of the PT under network system bus, CT is gathered by sampling unit (2.3);
C, reactive power are calculated: by master control system, calculate the required compensating power of network system;
D, MCR excitation unit receive Trigger Angle light signal: by master control system optic electric interface (2.5), send in real time required reactive power SCR Trigger Angle light signal to MCR excitation unit (6);
F, MCR work, realizes reactive power compensation under the soft start of the motor under soft start program and the network system bus under reactive power compensation program and regulates, and balance sysmte is idle;
When receiving soft start instruction, G, master control system (2) carry out by steps A, B, C, D, E, F.
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| CN103280818B (en) * | 2013-05-31 | 2015-04-22 | 广东电网公司江门供电局 | Transformer substation reactive voltage control method and system |
| CN105244886A (en) * | 2015-10-30 | 2016-01-13 | 陕西中电天源技术有限公司 | Power distribution network high-voltage treatment system and method based on magnetic control type series reactor, and application |
| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
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