CN100382404C - Comprehensive dynamic compensating device for distribution network - Google Patents
Comprehensive dynamic compensating device for distribution network Download PDFInfo
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- CN100382404C CN100382404C CNB2006101500575A CN200610150057A CN100382404C CN 100382404 C CN100382404 C CN 100382404C CN B2006101500575 A CNB2006101500575 A CN B2006101500575A CN 200610150057 A CN200610150057 A CN 200610150057A CN 100382404 C CN100382404 C CN 100382404C
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Abstract
Based on change of load, and dynamic output idle work in large range, the disclosed compensating device filters off harmonic in order to reach purposes: raising power factor, compensating asymmetric three phases, lowering flicker, and harmonic distortion rate so as to reduce loss of distribution network, and improve quality of power supply. The compensating device includes inversion bridge, and control unit. Through connection transformer being connected to distribution network, and connected to capacitor bank directly, the inversion bridge is in bridge structure of three levels and three single phases. Using direct current control algorithm based on phase-shifting carrier wave, the control unit collects bus voltages and currents from PT and CT on bus, as well as output current of device from CT of device, and DC voltage from capacitor bank to generate wave form in pulse-width modulation in order to control on/off of each power electronic device in the inversion bridge.
Description
Technical field
The present invention relates to electric power system and power electronics, especially the comprehensive dynamic compensating device for distribution network in the electric power system.
Background technology
Some load can significantly worsen the quality of power supply of points of common connection, for example rolling mill, arc furnace, large-scale rectifying installation, motor group or the like, they can cause frequent reactive power impact and harmonic pollution, not only cause power factor low, and can worsen every power quality index (comprise voltage fluctuation, voltage flicker, three-phase is asymmetric and percent harmonic distortion or the like) of points of common connection.
At present, domestic power distribution network all adopts traditional passive compensation arrangement, carries out the improvement and the improvement of the quality of power supply.But the passive compensation arrangement is made up of the impedance type element, and having response speed, slow (about 100～200ms), deficiency such as output characteristic is poor, active loss height, floor space are big, regulation effect is often not satisfactory.This is the difficult problem of pendulum in face of vast power consumer and Utilities Electric Co..
Along with the fast development of power electronic technology, flexible power transmission and distribution technology becomes the new valid approach of power distribution network synthesis dynamic compensation.Based on the comprehensive dynamic compensating device for distribution network that can turn-off power electronic device fast, based on active inverter, at power distribution network static reactive (Distribution Static Compensator, DSTATCOM) technology and active power filtering (Active Power Filter, APF) comprehensive and optimization on the basis of technology, it is fast to have response speed, good output, active loss is low, plurality of advantages such as small accommodation area, not only can improve the power factor of load, and can effectively suppress voltage fluctuation and flickering, asymmetric and the filtering harmonic wave of compensation three-phase makes that the quality of power supply of points of common connection is up to standard comprehensively.
(Static Compensator STATCOM), but belongs to mesohigh power transmission network reactive power compensation field to domestic two Static Var Compensator that put into operation once, is intended to improve the stability of power transmission network but not improves the quality of power supply.The comprehensive dynamic compensating device for distribution network that this paper invented is specifically designed to distribution network electric energy quality and administers, and belongs to domestic initiation.
Summary of the invention
The object of the present invention is to provide a kind of comprehensive dynamic compensating device for distribution network, can be according to the variation of load, dynamically output is idle on a large scale, the filtering harmonic wave, reach improve that power factor, compensation three-phase are asymmetric, burning voltage, reduction flickering and reduce the purpose of percent harmonic distortion, thereby reduce losses of distribution network, improve the quality of power supply, and for industrial enterprise save energy and reduce the cost, improve production efficiency and product quality.
Comprehensive dynamic compensating device for distribution network according to the present invention comprises: inverter bridge, insert power distribution network by connecting transformer, and link to each other with dc bus capacitor device group, described inverter bridge adopts three level, three single-phase bridge structures; Control unit, employing is based on the Direct Current Control algorithm of phase-shifting carrier wave, PT and CT from bus gather busbar voltage and electric current, CT harvester output current from device, and from capacitor group collection direct voltage, produce pulse-width modulation waveform, control the turn-on and turn-off of each power electronic device in the described inverter bridge.
Description of drawings
Fig. 1 is the main circuit diagram according to comprehensive dynamic compensating device for distribution network of the present invention.
Fig. 2 is according to three level, three half-bridge converter topological diagrams of the present invention.
Fig. 3 is according to connection transformer electrical schematic diagram of the present invention.
Fig. 4 is that two divisions according to the present invention connect the transformer electrical schematic diagram.
Fig. 5 is the circuit diagram according to two three level, three single-phase bridge common DC side capacitors groups of the present invention.
Fig. 6 is according to modularized design block diagram of the present invention.
Fig. 7 is the theory diagram according to control unit of the present invention.
Fig. 8 is according to comprehensive dynamic compensating device for distribution network of the present invention backstage man-machine interface.
Fig. 9 is the monitoring system block diagram according to comprehensive dynamic compensating device for distribution network of the present invention.
Figure 10 is the integrated protection unit schematic diagram according to comprehensive dynamic compensating device for distribution network of the present invention.
Embodiment
Fig. 1 is the main circuit diagram of power distribution network dynamic compensating device of the present invention.
Power distribution cabinet (1) provides direct current 220V, alternating current 220V and exchanges the 380V power supply for the various piece of device (such as system power supply, water-cooling system etc.), and is equipped with table meters such as 10kV voltmeter, varmeter, ammeter, is used in reference to the running status of showing device.After the energized, the control unit of device (5), monitoring means (7) and protected location (6) are just started working, the monitoring and the startup of protective device, the overall process that is incorporated into the power networks, moves and withdraw from.
Before device is incorporated into the power networks, startup rectifier cabinet (2) boosts interchange 380V and carries out controlled rectification, the voltage of the capacitor group (4) that will link to each other with the inverter bridge DC side is increased to needed value, inverter bridge (3) becomes power-frequency voltage with the dc voltage inversion, boost by connecting transformer (8), and progressively with system voltage same period.After satisfying the condition same period, high-tension switch cabinet (9) closes a floodgate, and device enters the state of being incorporated into the power networks.At this moment, start rectifier cabinet (1) and finished startup rectification task, under the control of control unit (5), disconnection is electrically connected with direct current capacitor group (4).
Device is incorporated into the power networks in the process, and control unit (5) is controlled calculating, the mode of operation of decision inverter bridge (3) from the voltage-current sensor of inverter bridge (3), the relevant data that device PT, CT etc. gather.Monitoring means (7) then utilizes these data monitorings and reports each analog quantity, the switching value of inverter bridge and system.Protected location (6) then utilizes the output of the sensor to judge whether the out-of-limit or unusual displacement of switching value of analog quantity, carries out protection strategies.Protected location is uploaded to control unit and monitoring means to relevant abnormal information and protection action situation by optical fiber in real time; control unit is taked corresponding control measures according to these information, and monitoring means is then given background computer by network with these information uploadings.
Cooling system (10) is a cooling media with water, is used to cool off inverter bridge, guarantees that power electronic device operates within the temperature range of permission.
Among the present invention because water-cooling base plate is as the part of electric loop, and with the insulation of inverter bridge electric loop, so the refrigerant of water-cooling system is soft water or anti-icing fluid, need not deionized pure water, water-cooling base plate is ground connection directly.Like this, greatly reduce the insulating requirements of water-cooling system, the complete sets of equipment reliability height, cost is low, is easy to realize.
In order effectively to compensate impact load, comprehensive dynamic compensating device for distribution network has adopted the The Direct Current Control based on phase-shifting carrier wave, and this technology is applicable to three level, three single-phase bridge topologys.Metallurgical equipment such as arc furnace and rolling mill is the thump load, and traditional compensation equipment response speed is slow, and the harmonic current amplification easily takes place, so be difficult to realize effective compensation.Comprehensive dynamic compensating device for distribution network adopts Direct Current Control, and the response time is no more than 5ms, and can guarantee not take place the harmonic wave amplification.So-called " response time " is meant from the idle step of specified perception to specified capacitive reactive power or from specified capacitive reactive power step to the idle needed time of specified perception.Device can be rapidly, dynamically compensating reactive power impacts, thereby significantly reduce the harm of metallurgical equipments such as arc furnace and rolling mill to the quality of power supply.
Fig. 2 is according to three level, three half-bridge converter topological diagrams of the present invention.Inverter bridge adopts three level, three single-phase bridge structures based on the power electronic device that can turn-off fast of high-voltage large-capacity, and capacity can reach a few megavar to tens megavars.Because capacity is bigger, so inverter bridge adopts water cooling mode.DC+, N, DC-represent positive bus-bar, center line and the negative busbar of DC side respectively in Fig. 2; A represents that with x, b and y, c and z three single-phase bridges exchange the outlet terminal of the abc three-phase of output.
Three single-phase bridge common DC side capacitors groups (as shown in Figure 2) insert power distribution network by connecting transformer.Connecting the transformer high-voltage side is the dihedral connection, and low-pressure side is three single-phase connections, links to each other with three half-bridge converters respectively, as shown in Figure 3.In Fig. 3, A, B, C represent the ABC three-phase that connects the transformer high-voltage side respectively, and a and x, b and y, c and z be the winding of indication transformer low-pressure side abc three-phase respectively.
Comprehensive dynamic compensating device for distribution network adopts modularized design.Each module mainly is made up of a connection transformer and the high-tension switch cabinet that is connected, inverter bridge and capacitor group; the total capacity of device can enlarge by multimode is in parallel; each module have independently control, monitoring and protected location, as shown in Figure 6.
Adopt many transformer with split windings, step down side can connect a plurality of three half-bridge converters, can increase exponentially installed capacity.Connecting two inverter bridge with step down side is example, connects the two splitted construction (as shown in Figure 4) of transformer adopting, two three single-phase bridge common DC side capacitors groups (as shown in Figure 5).
According to the main circuit topology shown in Fig. 3～6, set up the main circuit of comprehensive dynamic compensating device for distribution network.According to Fig. 1, form whole device and connecting system.
Device has the function that " key starts automatically " is incorporated into the power networks.The operations staff only needs to click the button that puts into operation and device can be incorporated into the power networks on the man-machine interface of backstage, need not other any interventions.Click puts into operation behind the button, control unit will the automatically actuated control model of access to plant, start the rectifier cabinet rectification of boosting automatically, control unit is examined the same period automatically, when inverter bridge output voltage and system voltage satisfy the same period during condition, the device auto-parallel drops into operation with closed ring, and disconnects the startup rectifier cabinet.
After device is incorporated into the power networks, adopt multi-objective coordinated control, controlled target comprises that improving power factor, constant voltage control, active power filtering and dc-voltage balance controls.The data that the control unit utilization collects, the mode of operation of decision inverter bridge, and the generation control impuls drives turning on and off of each power electronic device, the controlled voltage and current of output three-phase.
Fig. 7 is the theory diagram according to control unit of the present invention.To introduce the multi-objective coordinated control principle of comprehensive dynamic compensating device of the present invention according to Fig. 7 in detail below.
PT in the high-tension switch cabinet (Fig. 1 (9)), the voltage U of CT sensing lead bus
Bus, ABCElectric current I with device output
Svg, ABC, the electric current I of the CT sensing lead on the bus
Load, ABC, the voltage U of capacitor group (Fig. 1 (4))
Dc1And U
Dc2Obtain by Hall element.
Control unit utilizes A/D conversion, the voltage U of gathering bus
Bus, ABCAnd electric current I
Load, ABC, device output electric current I
Svg, ABCAnd the voltage U of capacitor group
Dc1And U
Dc2, by certain control law, carry out multi-objective coordinated control (as shown in Figure 7), controlled target comprises: (1) busbar voltage keeps constant; (2) load is zero from the idle of system's absorption, and the low-order harmonic electric current of injection is zero; (3) capacitor group voltage keeps constant; (4) capacitor group voltage keeps balance.
At first, the voltage and current signal that collects is carried out coordinate transform, be transformed into the two-phase dq coordinate system of rotation, obtain I from static three-phase ABC coordinate system
Load, PQAnd I
Svg, PQWherein, I
Svg, PBe the active current of device output, relevant with the voltage height of capacitor group, I
Svg, QBe the reactive current of device output, with busbar voltage and idle relevant.In addition, δ
UdcThe balance of voltage that is used for the regulating capacitor group.
Voltage and idle coordination control realize target (1) and (2).At first, according to the given busbar voltage command value of customer requirements U
Bus, refIdle command value Q
Bus, refThen, with the busbar voltage U of reality
BusWith the idle Q of bus
BusCompare their difference DELTA U
BusWith Δ Q
BusInput reactive voltage adjustment module.The reactive voltage adjustment module is exported the reference value I of reactive current according to the reactive voltage situation
Ref, QReactive current reference value I
Ref, QReactive current I with the actual output of device
Svg, QPoor Δ I
Q, be transfused to current regulating module 1, obtain I
Ref, qI
Ref, qBe used for comprehensive adjustment busbar voltage and idle.
Direct voltage control realizes target (3).According to the device designing requirement, set capacitor group voltage instruction value U
Dc, refU
Dc, refVirtual voltage U with the capacitor group
DcDifference DELTA U
DcBe input to the direct voltage adjustment module, obtain active current reference value I
Ref, PI
Ref, PActive current I with the actual output of device
Svg, PPoor Δ I
P, be transfused to current regulating module 2, obtain I
Ref, dI
Ref, dThe voltage height that is used for the regulating capacitor group.
I
Ref, dAnd I
Ref, qThrough the coordinate inverse transformation, obtain the current-order I under the ABC coordinate system
Ref, ABCI
Ref, ABCActual current I with device output
Svg, ABCDifference by current regulating module 3, obtain the pulse generation logic of three level, three single-phase bridges, finally generate pulse-width modulation (PWM) waveform, be used for controlling the turn-on and turn-off of each power electronic device of inverter bridge.With A phase inverter bridge is example, if the pulse logic of controller output is " 11000011 ", the state of then left brachium pontis 4 switches from top to bottom is " all absolutely ", and the state of right brachium pontis 4 switches from top to bottom is " absolutely all ", and the voltage of A phase inverter bridge output is U
Dc1+ U
Dc2B, C are mutually in like manner.By different pulse combined, can regulate the voltage of each phase inverter bridge output, thus the size that can regulate its output current continuously.
Dc-voltage balance control realizes target (4).When capacitor group voltage U
Dc1And U
Dc2Difference δ U
DcWhen surpassing threshold value, control unit starts dc-voltage balance control.The effect of dc-voltage balance control is: by suitable adjustment pulse generation logic, and the active current I of allotment inflow device
Svg, PThereby, adjust U
Dc1And U
Dc2Value, make voltage difference δ U
DcLevel off to zero.
Fig. 8 is according to comprehensive dynamic compensating device for distribution network of the present invention backstage man-machine interface.As shown in Figure 8, utilize " key starts automatically " that device is put into operation.On the man-machine interface on backstage, click " the moving benefit automatically of 1# starts ", the 1# compensation arrangement will automatically perform following process:
(1) backstage is assigned automatic starting command (Fig. 9) by Ethernet to the 1# control unit;
(2) after the 1# control unit receives this order, the 1# compensation arrangement is carried out self check;
(3) confirm device all normal after, the 1# control unit is to starting the instruction that rectifier cabinet sends closed rectifier switch, and control starts progressively the raise voltage of 1# capacitor group of rectifier cabinet;
(4) the inverter bridge output voltage U of 1# control unit control 1# compensation arrangement
Svg, and detect U
SvgWith busbar voltage U
BusThe situation same period;
(5) meet the condition same period after, the 1# control unit sends the instruction of " allow 1# compensation arrangement be incorporated into the power networks ", closes the 1# circuit breaker, disconnected rectifier switch, the 1# compensation arrangement inserts power distribution network;
(6) the 1# compensation arrangement enters the operation with closed ring pattern immediately, and the voltage of bus, idle and harmonic wave are carried out dynamic compensation.
Equally, on the man-machine interface of backstage, click " the moving benefit automatically of 2# starts " and " the moving benefit automatically of 3# starts ", 2# and 3# compensation arrangement can be put into operation.
In the power distribution network, a lot of loads are intermittent duties, for example arc furnace, rolling mill, electric railway, or the like.Traditional impedance type compensation arrangement even when load is stopped transport, still compensate, not only causes overcompensation easily, and has increased the active loss of device greatly, has reduced the efficient of device.
Comprehensive dynamic compensating device for distribution network has energy conservation model.When load underloading or stoppage in transit, the active power and the reactive power of bus are reduced to below the threshold value.Controller detects this state of load and does the time-delay of a period of time (to different loads, concrete criterion and time-delay difference to some extent), locking inverter bridge then, and device enters the locking pattern, does not produce switching loss.When load put into operation or become heavy duty, controller detects reactive power and active power rises to threshold value above (for preventing vibration, being provided with the ring that stagnates up and down between the threshold value), and then release inverter bridge is immediately recovered normally operation.Like this,, can reduce the switching loss of inverter bridge, improve the device average operating efficiency according to the running status of the intermittent duty situation determination device of loading.
Device has automatic involution function.After the protection locking took place device, self check was immediately also checked system condition.Self check is exactly that controller carries out involution to drive plate, and whether the signal that feeds back by drive plate has switching device to damage as can be known.Check that then direct voltage is whether within normal range (NR).By these two inspections can decision maker self safe condition.To the inspection of system condition, mainly be to judge whether system's three-phase voltage whether in normal range (NR), exists serious imbalance etc.
Under device and all normal situation of system condition, involution rapidly recovers normally operation, need not the operations staff and intervenes.
The integrated protection unit comprises the protection of bottom device level, goes up the protection of bed device level and system-level warning and backup protection.The device level protection is fastest, is about 50～150 μ s operate time; The protection of device level is taken second place, and is about 0.5～10ms operate time; System-level warning and backup protection are the slowest, and be 50ms～1s operate time.
As shown in figure 10.The device level protection is fastest.The state of detection in real time of the drive circuit of power electronic device and feedback device, electric current and voltage on detection in real time of current threshold comparison circuit and voltage threshold comparison circuit and the reverse power electronic device.When generating device damage, device overcurrent or overvoltage, the locking inverter bridge is moved in the device level protection in 50～150 μ s.In addition, component failure can cause circuit breaker trip.
Device level protection responsiveness slightly is inferior to the device level protection, can be used as the backup protection of device level protection.Protection system utilizes A/D conversion and instantaneous value to calculate, and obtains the output current and the direct voltage of device, and when generating means overload or direct voltage were too high, the device level was protected and move the locking inverter bridge in 0.5～10ms.
System-level protection speed is the slowest, when occurring jeopardizing device safety but being not the unusual service condition of particularly urgent, implements protection.For example, when power distribution network or load generation single phase ground fault, it is unusual that protection system can detect the system voltage effective value; Can cause that for another example protection system holds into displacement during water-cooling system temperature anomaly; And other similar fault messages.According to the different faults type, system-level protection is moved in 50ms～1s, locking inverter bridge or tripper circuit breaker.
When action protection is not tripping circuit breaker, just with the inverter bridge locking in most cases.At this moment, control unit carries out self check to device automatically.After confirming that device is normal, control unit sends inverter bridge involution order automatically, the normal operation of recovery device.Whole process need not the operations staff and intervenes.
Control unit, monitoring means, backstage and remote monitoring computer are formed local area network (LAN) by hub, and are connected to public network, as shown in Figure 9.Control unit and monitoring means all adopt distributed frame, and operation information is uploaded to the backstage by network, for example busbar voltage, bus current, bus is idle, device is exerted oneself, fault message, Operation Log, or the like.The backstage is sent to the remote monitoring computer by public network with operation information, browses for the related personnel, understands device ruuning situation and related data at any time.
Monitoring means does not participate in the control of inverter bridge, only device self-operating parameter, running status and system's relevant parameter is monitored, gathers and calculate, and reach background computer by network.
The running status of the real-time acquisition device of monitoring means, device and system is uploaded to the backstage man-machine interface on the one hand, browses for the operations staff; On the other hand, be uploaded to long-range man-machine interface, browse for other related personnel by wireless network.
Specific embodiments of the invention have more than been described.And scope of the present invention should not be limited to these descriptions.Any modification, improvement in principle of the invention scope all belongs to protection scope of the present invention.
Claims (7)
1. comprehensive dynamic compensating device for distribution network comprises:
Inverter bridge (3) inserts power distribution network by connecting transformer (8), and this inverter bridge (3) links to each other with dc bus capacitor device group (4), and described inverter bridge (3) adopts three level, three single-phase bridge structures;
Control unit (5), employing is based on the Direct Current Control algorithm of phase-shifting carrier wave, PT and CT from bus gather busbar voltage and electric current, CT harvester output current from device, and from capacitor group (4) collection direct voltage, produce pulse-width modulation waveform, control the turn-on and turn-off of each power electronic device in the described inverter bridge
Wherein control unit comprises:
The A/D modular converter is used to gather the voltage and current of actual bus, the electric current of the actual output of device and the virtual voltage of capacitor group;
Coordinate transferring, the electric current and voltage that is used for gathering is transformed into the two-phase dq coordinate system of rotation from static three-phase ABC coordinate system, and gets the active current of the actual output of auto levelizer and the reactive current of the actual output of device;
The reactive voltage adjustment module is used for according to given busbar voltage command value and idle command value and actual busbar voltage and the idle difference of bus, the reference value of output reactive current;
First current regulating module is used for poor according to the reactive current of the reference value of reactive current and the actual output of described device, and output is used to regulate busbar voltage and the idle electric current I of bus
Ref, q
The direct voltage adjustment module is used for the difference according to the virtual voltage of capacitor group voltage instruction value and capacitor group, the reference value of output active current;
Second current regulating module is used for poor according to the active current of the reference value of active current and the actual output of described device, and output is used for the electric current I of the voltage height of regulating capacitor group
Ref, d
The coordinate inverse transform block is used for I
Ref, dAnd I
Ref, qBe transformed into three-phase ABC coordinate system from two-phase dq coordinate system, to obtain current-order;
The 3rd current regulating module, be used for poor according to the electric current of current-order under the three-phase ABC coordinate system and the actual output of described device, obtain the pulse generation logic of three level, three single-phase bridges, finally generate pulse width modulated wave, be used for controlling the turn-on and turn-off of each power electronic device of inverter bridge.
2. comprehensive dynamic compensating device for distribution network according to claim 1 also comprises:
Monitoring means (7) is used to monitor each analog quantity, the switching value of inverter bridge, by network these information is reported to send background computer to;
Protected location (6) has judged whether the out-of-limit or unusual displacement of switching value of analog quantity, carries out protection strategies, and relevant abnormal information is uploaded to control unit (5) and monitoring means (7) by optical fiber.
3. comprehensive dynamic compensating device for distribution network according to claim 2, the protection strategy of described protected location is divided into:
Device level, when power electronic device damage, power electronic device overcurrent or overvoltage took place, the locking inverter bridge was moved in the device level protection in 150 μ s at 50 μ s;
The device level, when the direct voltage of generating means overload or device was too high, the locking inverter bridge was moved in the protection of device level in 10ms at 0.5ms.
4. comprehensive dynamic compensating device for distribution network according to claim 2, described control unit and monitoring means adopt distributed frame, transmit data by network remote.
5. according to any described comprehensive dynamic compensating device for distribution network among the claim 1-3, wherein connect transformer (8) high-pressure side and adopt angle scheme, low-pressure side adopts three single-phase wiring, and when the many groups of connection inverter bridge, adopts many transformer with split windings structure.
6. according to any described comprehensive dynamic compensating device for distribution network among the claim 1-3, wherein said comprehensive dynamic compensating device for distribution network adopts modularized design, by the multimode compensation capacity that enlarges in parallel.
7. according to any described comprehensive dynamic compensating device for distribution network among the claim 1-3, described comprehensive dynamic compensating device for distribution network is judged the operating mode that load is current, when load underloading or stoppage in transit, control unit sends blocking order to inverter bridge, inverter bridge is in blocking, does not have any loss; When load became heavy duty or puts into operation, control unit sent unlock command to inverter bridge, and device recovers dynamic compensation again.
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| CN102130459A (en) * | 2011-03-08 | 2011-07-20 | 济南银河电气有限公司 | Dynamic reactive power compensation device for circuit |
| US8731728B2 (en) * | 2011-07-25 | 2014-05-20 | General Electric Company | Power distribution system |
| CN103107545A (en) * | 2011-11-09 | 2013-05-15 | 哈尔滨九洲电气股份有限公司 | Pulse-width modulation (PWM) signal generation device of scalable vector graphics (SVG) reactive power compensation generator |
| CN104181471B (en) * | 2013-05-28 | 2016-12-28 | 阳光电源股份有限公司 | A kind of inverter power consumption monitoring method and apparatus |
| CN103795066A (en) * | 2013-12-31 | 2014-05-14 | 江苏德顺祥电气有限公司 | Control method of electricity distribution network active filtering static reactive compensation |
| CN103956759A (en) * | 2014-05-20 | 2014-07-30 | 国家电网公司 | Dynamic voltage compensation device |
| CN104050366B (en) * | 2014-06-13 | 2017-09-01 | 国家电网公司 | A kind of dynamic reactive compensation device response time method of testing |
| CN109088414B (en) * | 2018-08-13 | 2020-08-11 | 许继集团有限公司 | Power distribution network system and reactive power control method and control system thereof |
| CN109861239A (en) * | 2018-12-26 | 2019-06-07 | 国网内蒙古东部电力有限公司经济技术研究院 | STATCOM stratification Preservation tactics based on FACTS technology |
| CN112600220B (en) * | 2020-07-13 | 2022-08-26 | 南京南瑞继保工程技术有限公司 | Flexible arc-suppression converter with additional reactive compensation and control method thereof |
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