CN2738449Y - Voltage series dynamic compensating device - Google Patents
Voltage series dynamic compensating device Download PDFInfo
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- CN2738449Y CN2738449Y CN 200420089119 CN200420089119U CN2738449Y CN 2738449 Y CN2738449 Y CN 2738449Y CN 200420089119 CN200420089119 CN 200420089119 CN 200420089119 U CN200420089119 U CN 200420089119U CN 2738449 Y CN2738449 Y CN 2738449Y
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Abstract
The utility model relates to a voltage series dynamic compensating device which belongs to the technical field of the voltage dynamic compensation of an electrical power system. The utility model is characterized in that through the measuring and controlling circuit formed by a microprocessor (or DSP) as a core, the outputting sine voltage of a de-to-ac converter is directly connected in series to the power supply voltage when the voltage foundering and surging to compensate for desired voltage and to make voltage of load end free from influence. The voltage series dynamic compensating device fully uses the left voltage when the voltage foundering, adds the output voltage of de-to-ac converter on one hand to make the load end obtain voltage in stable operation, and carries out half-cycle cross charging to the energy storing direct current capacitance on the other hand to reach using the least DC capacitance to store energy. The voltage series dynamic compensating device can separately solve the problem of voltage foundering, can also solve the problem of voltage foundering and surge simultaneously. The utility model has the advantage of small first time investment and small volume.
Description
Technical field
The Voltage Series dynamic compensator belongs to Electrical Power System Dynamic voltage compensator technical field.
Background technology
Developed country is very high to the requirement of quality of power supply level, power quality problem not only can bring very big economic loss to industrial quarters, cause production cost to increase as stopping work and restarting, the damage equipment that is quick on the draw, scrap semi-finished product, reduce product quality, cause marketing difficulty and the infringement corporate image and and user's good commercial relations etc., and bring harm can for the equipment of important electricity consumption such as medical treatment department, cause serious production and interruption of service, EPRI-Electric Power Research Institute (EPRI) studies show that, power quality problem causes U.S.'s industry in data every year, on material and the productivity with a toll of 30,000,000,000 dollars (Electric PowerResearch Institute, 1999), in Singapore, each voltage instantaneous descends all can cause the economic loss that surpasses 1,000,000 Singapore dollars; Along with developing rapidly of China's high-technology industry, requirement to quality of power supply level is also more and more higher, voltage subside with surge be wherein subject matter, voltage is subside the quality of voltage problem that not only can cause electric power system with surge, the also trouble free service of entail dangers to power consumption equipment, electric power system fault, large-size machine starts, subcircuits short circuit etc. can cause that all voltage subsides, voltage surge is by lightning, connecting electric power system and other reasons causes overvoltage to cause, large-size machine and air conditioner are that big voltage surge produces the source, though it is short that voltage was subside with the surge time, but it can cause the interruption or the shut-down of industrial process, and cause industrial process downtime be far longer than voltage and subside itself with the surge accident time, therefore the loss that is caused is very big, the feature that voltage is subside is that supply voltage drops to 10% to 90% normal voltage value suddenly and continues 0.5 to 50 cycle, the feature of voltage surge is that supply voltage rises to 110% to 180% normal voltage value suddenly and continues 0.5 to 50 cycle, overwhelming majority voltage is subside and surge, its change in voltage amplitude in 50%, and the duration be no more than 500 milliseconds;
Traditional method, can not address these problems as voltage regulator and surge suppressor, though and the UPS device can address these problems, but its cost and operating cost are all extremely expensive, in order to address the above problem, dynamic voltage compensator has been carried out research both at home and abroad, the inverter of voltage dynamic compensator is every both at home and abroad at present mainly constitutes the full-bridge type structure by 4 groups of IGBT mutually, from design, can be divided into two big classes:
1. injection transformer mode
The sinusoidal voltage of inversion is connected in series to circuit by the transformer that injects, and charges to dc capacitor with transformer, or waits energy storage with flywheel;
2. there is not the injection transformer mode
Need to charge to dc capacitor with storage battery, super storage capacitor or with transformer;
The subject matter of its existence:
1. for dynamic voltage compensator, IGBT is most important element, and price is not cheap yet, and power is big more, and IGBT is just expensive more, 4 groups of shared cost height of IGBT;
2. the transformer capacity of Zhu Ruing is relevant with load, and load is big more, and transformer capacity is just big more, and volume and the cost impact to whole device is very big like this, and it is suitable for middle and high volt circuit.For low-voltage circuit, not too economical and practical, and also have problem such as transformer pressure drop;
3. there is not injection transformer if come energy storage with storage battery, its capacity usage ratio is extremely low, and problems such as maintenance, environmental protection are arranged, in general, battery applications is in the design of dozens of minutes or several hours, and the multiple discharge of utmost point short time can influence its life-span, comes energy storage all very expensive with super storage capacitor or flywheel, no injection transformer then needs very big capacity if come energy storage with dc capacitor; If will use the least possible direct current capacity, then the capacity of charging transformer must be relevant with load capacity, so just makes the volume of whole device and cost increase;
Apply for and disclose the dynamic series voltage compensator and the dynamic series voltage compensation method of the Singapore Power Ltd of (publication number is 1353880) in June, 2002 to China State Intellectual Property Office in April, 2000, subside (rapid drawdown) problem and design at voltage, use batteries to store energy, just not saying the maintenance issues of its storage battery, only the capacity usage ratio of its storage battery is with regard to very low (being lower than 2%), thereby also increased cost greatly, inverter is made of 4 groups of IGBT of H type, has also increased cost;
The application number that I proposed on March 12nd, 2004 is in " voltage is subside the surge dynamic compensator " invention design of 200410008462.4, adopted the design of SCR control charging current, this design can solve voltage and subside problem, also can solve the voltage surge problem, but it requires than higher to the control of controllable silicon trigger angle; In the utility model design, the method design current-limiting charge branch road that utilizes charging diode, current-limiting charge resistance and relay or contactor to combine, make that the current-limiting charge branch road is unique more, simple, realize easily, the design both can be used as independent solution voltage and had subside problem, also can solve voltage simultaneously and subside and the surge problem, have very big flexibility.
The utility model content
The purpose of this utility model is to provide a kind of Voltage Series dynamic compensator;
The Voltage Series dynamic compensator that the utility model proposes is directly to be connected in series to (as 380 volts) in the low voltage electric network, can solve voltage simultaneously subsides and the surge problem, when removing discharge paths, can subside problem as only solving in the electric power system alternating voltage again, have very big flexibility; Line voltage is subside or during surge, its inverter is exported corresponding sinusoidal voltage and directly is injected into and compensates required voltage in the electrical network, because most voltages are subside and surge, its voltage amplitude is in 50%, and the duration is no more than 500 milliseconds, and therefore, the remaining voltage more than 50% of system intersects charging to the dc capacitor of energy storage when utilizing voltage to subside, make that required energy storage direct current capacity is minimum, the energy that rises when absorbing voltage surge by discharge paths; In the design, the injection transformer that had not both had the volume heaviness, do not need charging transformer again, inverter is made of 2 groups of IGBT of full control semi-bridge type, reduced cost, the method design current-limiting charge branch road that utilizes current-limiting charge resistance and relay or contactor to combine of its uniqueness makes the current-limiting charge branch road oversimplify;
Of the present utility model being characterised in that:
It is made up of three single-phase Voltage Series dynamic compensators, respectively contains:
Measure and control circuit, comprise:
Microprocessor;
Programmable timer, its timing signal input end links to each other with the corresponding output end of described microprocessor;
Logical AND or door, its two inputs are that the block signal output of IGBT links to each other with the insulated door gridistor of the pulse-width modulation PWM signal output part of described programmable timer, described microprocessor respectively;
The supply voltage instrument transformer of serial connection is PT and filter circuit mutually, and the input of described supply voltage instrument transformer links to each other with supply voltage, and the output of described filter circuit links to each other with the supply voltage measuring-signal input of described microprocessor;
The load current instrument transformer of serial connection is CT and filter circuit mutually, and the input of described load current instrument transformer is a load current signal, and the output of described filter circuit links to each other with the load current measuring-signal input of described microprocessor;
Single-phase voltage series connection dynamic compensator, contain:
Silicon controlled main rectifier is made of two controllable silicon inverse parallels, and it is serially connected with in power supply and the load circuit, and its control end links to each other with the silicon controlled main rectifier control signal output ends of described microprocessor;
Charging diode is formed by two diode forward serial connections, and their tie point links to each other with the middle line end of power supply;
The current-limiting charge branch road, by the normally opened contact of current-limiting charge resistance and relay or contactor and connect and form, an end of their parallel connections links to each other with power input, and the other end links to each other with the point of contact of following two groups of storage capacitors; The relay of current-limiting charge branch road or the control end of contactor link to each other with the relay of described microprocessor or the control signal output ends of contactor;
The energy storage branch road is formed by two groups of storage capacitor serial connections, and their tie point links to each other with the other end of above-mentioned current-limiting charge branch road;
Inverter, by two insulated door grid thyristors is that the IGBT serial connection forms, be connected in series filter inductance and electric capacity successively between the tie point of the tie point of above-mentioned two inverters and two storage capacitors, the tie point between this filter inductance and the filter capacitor is continuous with that contact that silicon controlled main rectifier links to each other with load through the normally opened contact of another relay or contactor; Described inverter is while and energy storage branch road and charging diode parallel connection; The control end of each insulated door grid thyristor links to each other with the control IGBT signal output part of above-mentioned logical AND or door; The control end of this relay or contactor links to each other with another relay of described microprocessor or the control signal output ends of contactor.
A discharge paths in the parallel connection of described energy storage branch road, and this discharge paths is formed by discharge resistance and discharge switch serial connection, and the control end of described discharge switch links to each other with the discharge switch control signal output ends of described microprocessor.
Between described each silicon controlled main rectifier and power source loads, respectively be connected in series an isolating switch, between power supply and load, be connected in series a by-pass switch.
The utility model does not use injection transformer, directly be connected on i.e. 380 volt of one side of voltage low pressure, under operate as normal, power to the load by controllable silicon, the efficient height, and subside or during surge at voltage, can protect power consumption equipment, it has save big capacity charging transformer, utilizes the method design current-limiting charge branch road that current-limiting charge resistance and relay or contactor combine, and is charged by current-limiting charge branch road and the charging diode dc capacitor to energy storage; It comes energy storage with direct current capacity seldom, and the dc capacitor of energy storage is divided into positive and negative two groups, and one group provides energy to the inverter time spent, and another organizes charging, and each group continuous discharge is half AC network cycle; It has also save half number of I GBT thyristor.
Description of drawings
Fig. 1. single-phase voltage series connection dynamic compensator schematic block circuit diagram.
Fig. 2. measure and the control circuit theory diagram.
Fig. 3. the Voltage Series dynamic compensator schematic block circuit diagram of single-phase zone by-pass switch.
Fig. 4. solve the single-phase voltage series connection dynamic compensator schematic block circuit diagram that voltage is subside.
Embodiment
In the empty frame of Fig. 1 the design principle figure of single-phase Voltage Series dynamic compensator 17, three-phase can by independently three single-phasely constitute, energy required between the amortization period is provided by a spot of dc capacitor 6,7, not only environmental protection but also low cost, designed dynamic compensator solves the problem of subsideing when not having discharge paths, can solve the voltage surge problem again when adding discharge paths, very flexible;
Shown in the empty frame 17 of Fig. 1, voltage is subside surge dynamic compensator 17 by silicon controlled main rectifier 1, inverter 2,3, charging diode 4,5, dc capacitor 6,7, ac filter inductance 8, ac filter electric capacity 9, relay or contactor 10, discharge resistance 11, discharge switch 12, current-limiting charge electricity group 15, current-limiting charge relay or contactor 16, and measure and control circuit 21 (see figure 2)s formation, when the Voltage Series dynamic compensator only when solving voltage and subside, do not have discharge resistance 11 and discharge switch 12, below introduce each part in detail:
1 is one group of antiparallel silicon controlled main rectifier (during low capacity, also can consider the IGBT anti-series is come to use together), and during operate as normal, power supply 13 voltages offer load by them;
2 and 3 is IGBTs (insulated door gridistors), and they have formed inverter, and power supply 13 voltage instantaneous change when surpassing set point, and according to required voltage, inverter is exported corresponding pulse-width modulation PWM signal;
4 and 5 is charging diodes, is used for charging to dc capacitor 6,7;
6 and 7 is dc capacitors, is used for storage power so that when compensation is required, even between the amortization period, also can obtain charging every half period;
8 and 9 is respectively ac filter inductance and electric capacity, and the pwm signal of inverter 2 and 3 outputs obtains sinusoidal voltage during compensation after 8 and 9, and this sinusoidal voltage is connected in series to and compensates required voltage in the electrical network, makes load 14 voltages not be subjected to the influence of power supply 13 voltages;
The 10th, closed after relay or contactor, the voltage of dc capacitor 6,7 are full of;
11 and 12 discharge resistance and switches (switch is MOSFET or IGBT) when being voltage surge respectively, when the Voltage Series dynamic compensator only when solving voltage and subside, remove 11 and 12, as shown in Figure 4;
13 represent power supply, and the end that links to each other with silicon controlled main rectifier 1 or by-pass switch 18 is the power firestreak end, and the end that links to each other with the point of contact of two diodes is middle line end;
14 represent load;
The 15th, current-limiting charge resistance;
The 16th, closed after current-limiting charge relay or contactor, the voltage of dc capacitor 6,7 are full of;
Goodbye Fig. 1～4:
When powering on, power supply 13 voltages are by charging diode 4,5 and 15 pairs of dc capacitors 6 of current-limiting charge resistance, 7 charge, when dc capacitor 6, after 7 voltage is full of, send signal by measurement and control circuit 21 and come closing relay or contactor 10 and 16, during operate as normal, power supply 13 voltages offer load 14 by silicon controlled main rectifier 1, measure and control circuit 21 real-time monitoring power supply 13 voltages, when detecting power supply 13 voltages above set point, disconnect silicon controlled main rectifier 1, measurement and control circuit 21 send control signal makes inverter 2, the corresponding pwm signal of 3 outputs, pwm signal is behind ac filter inductance 8 and electric capacity 9, obtain required sinusoidal voltage, this sinusoidal voltage and power supply 13 voltages are superimposed, and make load obtain normal voltage;
In actual applications, design as shown in Figure 1 can directly be connected in series in the power supply of load, also can be connected in series to together in the power supply of load to maintain easily, to overhaul with by-pass switch 18, isolating switch 19,20, as shown in Figure 3, by-pass switch and the isolating switch with three-phase is applied in the three-phase system.
Claims (3)
1. Voltage Series dynamic compensator, it is characterized in that: it contains three single-phase Voltage Series dynamic compensators, respectively contains:
Measure and control circuit, comprise:
Microprocessor;
Programmable timer, its timing signal input end links to each other with the corresponding output end of described microprocessor;
Logical AND or door, its two inputs are that the block signal output of IGBT links to each other with the insulated door gridistor of the pulse-width modulation PWM signal output part of described programmable timer, described microprocessor respectively;
The supply voltage instrument transformer of serial connection is PT and filter circuit mutually, and the input of described supply voltage instrument transformer links to each other with supply voltage, and the output of described filter circuit links to each other with the supply voltage measuring-signal input of described microprocessor;
The load current instrument transformer of serial connection is CT and filter circuit mutually, and the input of described load current instrument transformer is a load current signal, and the output of described filter circuit links to each other with the load current measuring-signal input of described microprocessor;
Single-phase voltage series connection dynamic compensator, contain:
Silicon controlled main rectifier is made of two controllable silicon inverse parallels, and it is serially connected with in power supply and the load circuit, and its control end links to each other with the silicon controlled main rectifier control signal output ends of described microprocessor;
Charging diode is formed by two diode forward serial connections, and their tie point links to each other with the middle line end of power supply;
The current-limiting charge branch road, by the normally opened contact of current-limiting charge resistance and relay or contactor and connect and form, an end of their parallel connections links to each other with power input, and the other end links to each other with the point of contact of following two groups of storage capacitors; The relay of current-limiting charge branch road or the control end of contactor link to each other with the relay of described microprocessor or the control signal output ends of contactor;
The energy storage branch road is formed by two groups of storage capacitor serial connections, and their tie point links to each other with the other end of above-mentioned current-limiting charge branch road;
Inverter, by two insulated door grid thyristors is that the IGBT serial connection forms, be connected in series filter inductance and electric capacity successively between the tie point of the tie point of above-mentioned two inverters and two storage capacitors, the tie point between this filter inductance and the filter capacitor is continuous with that contact that silicon controlled main rectifier links to each other with load through the normally opened contact of another relay or contactor; Described inverter is while and energy storage branch road and charging diode parallel connection; The control end of each insulated door grid thyristor links to each other with the control IGBT signal output part of above-mentioned logical AND or door; The control end of this relay or contactor links to each other with another relay of described microprocessor or the control signal output ends of contactor.
2. Voltage Series dynamic compensator according to claim 1, it is characterized in that: a discharge paths in the parallel connection of described energy storage branch road, this discharge paths is formed by discharge resistance and discharge switch serial connection, and the control end of described discharge switch links to each other with the discharge switch control signal output ends of described microprocessor.
3. Voltage Series dynamic compensator according to claim 1 and 2 is characterized in that: respectively be connected in series an isolating switch between described each silicon controlled main rectifier and power supply, load, be connected in series a by-pass switch between power supply and load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420089119 CN2738449Y (en) | 2004-08-27 | 2004-08-27 | Voltage series dynamic compensating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420089119 CN2738449Y (en) | 2004-08-27 | 2004-08-27 | Voltage series dynamic compensating device |
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| Publication Number | Publication Date |
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| CN2738449Y true CN2738449Y (en) | 2005-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200420089119 Expired - Fee Related CN2738449Y (en) | 2004-08-27 | 2004-08-27 | Voltage series dynamic compensating device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664414A (en) * | 2012-05-04 | 2012-09-12 | 深圳市理工新能源有限公司 | Dynamic voltage compensator |
| CN102694363A (en) * | 2012-05-25 | 2012-09-26 | 贵阳供电局 | Power electronic circuit breaker device |
-
2004
- 2004-08-27 CN CN 200420089119 patent/CN2738449Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664414A (en) * | 2012-05-04 | 2012-09-12 | 深圳市理工新能源有限公司 | Dynamic voltage compensator |
| CN102694363A (en) * | 2012-05-25 | 2012-09-26 | 贵阳供电局 | Power electronic circuit breaker device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051102 Termination date: 20110827 |