CN2742651Y - Full output intelligent compensation power saving device for generator - Google Patents

Full output intelligent compensation power saving device for generator Download PDF

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Publication number
CN2742651Y
CN2742651Y CN 03256908 CN03256908U CN2742651Y CN 2742651 Y CN2742651 Y CN 2742651Y CN 03256908 CN03256908 CN 03256908 CN 03256908 U CN03256908 U CN 03256908U CN 2742651 Y CN2742651 Y CN 2742651Y
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generator
power
unit
full output
reactive power
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CN 03256908
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Chinese (zh)
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陈巍
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Abstract

The utility model discloses a full output intelligent compensation power saving device for a generator which uses a wattless power supply (a condenser bank) (14) in place of the generator to generate wattles power and applies intelligentized controlling means to control the switch of the wattless power supply, enabling the generator to stably operate in a full output (cos phi =0.95-1) state. The full output intelligent compensation power saving device for a generator is provided with an intelligentized controller GZK which automatically controls the voltage loss of voltage, current, power factor, and secondary device, the signal of the intelligentized controller GZK is processed by an intelligent element after passing through a sampling detection unit (1), a sampling detection unit (2), a sampling detection unit (3), and an A/D transmission unit (4), and the intelligentized controller GZK automatically controls the switch of the wattless power supply and the compensation of metering loss. The full output intelligent compensation power saving device for a generator has the triplex protection functions of electrified wire netting, failure, and discharge and adopts a regulation unit (12) to match with the full output intelligent compensation power saving device for a generator, reliably ensuring the operating safety of the generator. The full output intelligent compensation power saving device for a generator is suitable for various medium and small sized power generators, such as diesel dynamos and hydro-turbo generators, and the full output intelligent compensation power saving device for a generator stabilizes voltage and improves meritorious output of the power generator, saving energy.

Description

The generator intelligent expansion joint electric installation of exerting oneself entirely
(1), technical field
The utility model is a kind of generator intelligent expansion joint electric installation of exerting oneself entirely.The utility model can be applicable to various medium and small generators, comprise hydraulic generator and diesel engine generator etc., can be used with the generator in the electric power system, also can be used with independent generator, it is a kind of energy savings, the raising generator is meritorious exerts oneself the novel product of the idle situation of improvement system.
(2), background technology
According to the tradition regulation, generator is when specified running status, and its rated power factor is cos N=0.8.This is because according to the electrical network regulation, generator is not only wanted active power of output, and the reactive power of some will be provided, to satisfy the stable and load needs of network voltage.Even the generator that works independently because it is necessary for inductive load reactive power is provided, generally can not reach full the running status of exert oneself (be generator cos =1, complete sending out gained merit).
Therefore, need the middle small generators of fuel, just must expend the fuel of 15%～20% preciousness more to be converted to reactive power for diesel engine generator etc.And for numerous medium waterpower generator stations, because its water yield is because of changing season, its reactive power is difficult to reach the requirement of regulation especially.They are in the wet season, and the energy output abundance can not only satisfy local network load requirement, also can flow to big electrical network; And in dry season, then because of the energy output deficiency, need again to give the user from the anti-power supply of big electrical network.Because the needs of generator operation and the consideration of economic interests, the power factor of these medium and small water power group of planes are often very highly fixed in the wet season, rob send out meritorious, owe idle, thereby make the local power network by their power supplies need from big electrical network absorbing reactive power.For this situation, existing way is basis and fidonetFido, to power factor overrate (cos N=0.8), capacity of idle power is sent out not enough hydroelectric station fine and is got over.In fact, from the angle of operation power, problem is far from so simple.This is because remote mountain area, most hydroelectric station, electric power transfer is far away, local power network based on middle small hydropower station power supply, often because idle deficiency, cause reactive power flow disordered motion in net, causing net (line) to decrease increases, and voltage fluctuation is excessive, even threatens the security of operation of whole system.Centering small generators group, they self are deeply hurt especially, particularly those water channeling types (radial-flow type) hydroelectric plant.This is because the water yield changes, and the active power of hydraulic generator unit, reactive power need often to regulate, according to existing specified running status power factor cos N=0.8, its active power of sending only is 80% of its apparent rated capacity, and this is not only a kind of waste of power resource, makes also that place capacity is occupied and can not get performance.In addition, because of the automatization level of local power network and middle small hydropower station all lower, system's reactive power can not homeostasis, when line voltage raises, Hydropower Unit absorbs big net reactive current and leading phase operation automatically, force the hydraulic turbine to strengthen guide vane opening,, cause unit unstability, tripping operation at last and off-the-line to increase meritorious exerting oneself; And when line voltage reduced, it is idle that Hydropower Unit then can be issued additional automatically, and the output of restriction active power causes the waste of the wet season water yield.
(3), summary of the invention
The utility model is the generator intelligent expansion joint electric installation of exerting oneself entirely; it is by intelligent reactive power controller GZK; compensating unit [9]; performance element [11]; protection voltage regulation unit [12]; thyristor module [13]; reactive power source device [14] and external metering units compositions such as [15]; it is characterized in that respectively from electric current and voltage transformer CT; PT measures u; electric quantity signals such as i and angle thereof; deliver to reactive power compensating controller GZK; detect through its each unit; after the intelligent processing such as comparison and calculating; send the switching signal respectively; the overvoltage protection signal is given performance element [11]; control thyristor module [13]; switching reactive power source device [14]; other has the PT compensating signal to give compensating unit [9]; after Intelligent treatment; its signal is imported external metering units [15] respectively and is fed back to the GZK device; generator G1 is through protection voltage regulation unit [12]; absorb the reactive power that export [14] by [13], the active power after its compensation is through transformer T 1Flow to electrical network, the efficient electricity-saving operation realizes exerting oneself entirely.
The utility model must not much be sent out active power at what medium and small generator existed for sending out reactive power, cause the present situation of energy waste, it is idle to replace generator to produce with reactive power source (as Shunt Capacitor Unit etc.), and be used in load side (or step-up transformer high-pressure side) and measure signal, in generating pusher side (or step-up transformer low-pressure side) fuzzy mathematics control theory and the method controlled, switching to reactive power source carries out intellectuality control, make when satisfying load and the idle requirement of system, generator can stable operation under (being cos =0.95～1) state of exerting oneself entirely.The utility model is by (also can in low-pressure side) measures μ, i in the high-pressure side; cos electric quantity signal; control in low-pressure side, form with the controller GZK that realizes reactive power compensation, PT compensating unit, performance element, thyristor power model, reactive power source device (as Shunt Capacitor Unit etc.) and protection voltage regulation unit.Controller GZK passes through voltage transformer pt, special-purpose current transformer CT measures electric quantity signal μ at step-up transformer T1 high-pressure side (also can at low-pressure end), i, and it is delivered to power-factor angle measuring unit [1], measure the size of power-factor angle and be converted to magnitude of voltage (digital signal) and be delivered to central processing unit CPU (89C51) [5] by it, simultaneously current i and voltage μ signal are converted to digital signal to A/D modular converter (ADC0890) [4] respectively behind current transformation unit [2] and voltage transformation module [3], import central processing unit CPU (89C51) [5] again; The voltage loss signal of PT secondary side is converted to digital signal input CPU CUP[5 by PT compensating module [9]].After CPU calculates, connect (8155) [6] and send following signal: reactive power source switching signal, PT secondary side compensating signal and possible overvoltage protection signal and capacitor set discharge alarm signal by walking abreast.Wherein reactive power source device [14] is thrown, cut to reactive power source switching signal and overvoltage protection signal with control execution unit (as the solid-state relay group) [11] by performance element [11] control thyristor power model [13].Reactive power source is made of fixed capacitor group and adjustable condenser group, and its capacity should satisfy following formula:
Q GB＝Q d+Q b＝Q F+Q M+Q T (1)
Wherein
Q F＝S NG·cos1·α·(tg1-tg2) (2)
Q M＝K 0Q MN+(1-K 0)β M 2Q MN (3)
Q T = I D * 100 · S NT + β 2 · U K 100 · S NT - - - ( 4 )
In following formula:
Q GB---the reactive power total amount (Kvar) that the utility model compensation arrangement is supplied with;
Q d---the reactive power total amount (Kvar) that the fixed capacitor group provides;
Q b---the reactive power total amount (Kvar) that the adjustable condenser group provides
Q F---generator G1 should be the idle merit that the branch road load provides
Rate total amount (Kvar);
Q M---required idle of power station self load (being station service)
Quantity of power (Kvar)
Q T---step-up transformer reactive power loss (Kvar);
S NG---the rated power (KW) of generator;
Cos 1---compensation preload power factor;
The economy load coefficient of α---step-up transformer T1, desirable α=0.8;
β---transformer load rate;
I * D---transformer load electric current per unit value;
---transformer short-circuit voltage percentage (per unit value);
S NT---the specified apparent capacity of transformer (KVA);
QMN---the reactive power amount under the station-service load rating running status;
K0QMN---the reactive power loss when the station-service load is unloaded, it and load running situation
Irrelevant and basic fixed is constant, no-load factor K0 is about 0.6～0.7;
β M=PM/P MN---station-service load stand under load rate, PM is the actual machine load, PMN is specified
Active power under the running status.
By (4) formula as can be known:
The reactive power loss during no-load transformer wherein Be changeless, therefore available fixing reactive power source group compensates this reactive requirement partly.For substituting the reactive power that compensated dynamo should provide fully, the reactive power total amount QGB that the utility model compensation arrangement provides should check by following formula:
Q GB≥P NG·tg IN (5)
In the formula:
P NGThe rated power of-generator G (KW);
IN-sign according to power station, generator G place and power supply department and the fidonetFido defined
Power-factor angle (being the common power factor cos IN that says);
Tg INThe tangent value of-regulation power-factor angle (is generator reactive power amount and active power
The ratio.(Kvar/KW)
The utility model is applicable to that capacity is the generator of 12kw～6300kw; Suitable electric pressure is: 0.4kv～10kv; Generator power factor cos can reach 0.95～1.0 (hysteresis); The precision of voltage regulation is not less than 2.5%; Action response speed is not less than 2ms and faulty indication and electric weight and pulse Presentation Functions such as μ, i, cos such as overvoltage, discharge is arranged.What especially will propose is.The present invention has electrical network overvoltage protection, generator overvoltage protection and capacitor set discharge protection triple protection function, can guarantee the safety of generator reliably, and have communication interface, can realize the long-range switching of capacitor.Use the utility model can make generator output increase by 15%～20%; The transmission of electricity line loss reduces by 20%～30%, and direct economic benefit increases by 15%～25%.
(4), description of drawings
Fig. 1 is the generator intelligent expansion joint electric installation embodiment overall structure schematic diagram of exerting oneself entirely
Fig. 2 is electric current, voltage and power factor angular measurement and converted quantity unit line schematic diagram
Device [1] is a power-factor angle measuring unit among Fig. 1, device [2] is a current transformation unit, device [3] is a voltage transformation module, device [4] is A/D modular converter (ADC0890), device [5] is CPU (89C51), device [6] is parallel interface (8155), device [7] is the keyboard input unit, and device [8] is a display unit, and device [9] is the PT compensating unit, device [10] is the discharge alarm unit, device [11] is a performance element, and device [12] is a voltage regulation unit, and device [13] is the thyristor power model, device [14] is the compensation condenser group, and device [15] is a metering units.
(5) embodiment
Below by accompanying drawing the utility model is further described:
Fig. 1 is the generator intelligent expansion joint electric installation embodiment overall structure schematic diagram of exerting oneself entirely
Fig. 2 is electric current, voltage and power factor angular measurement and converted quantity unit line schematic diagram
Embodiment:
PT is a voltage transformer among Fig. 1, and CT is special-purpose current transformer, and electric quantity signal i, μ measure at step-up transformer T1 high-pressure side by them, delivers to current transformation unit [2], voltage transformation module [3] and power-factor angle measuring unit [1] respectively.Wherein be converted to digital signal through A/D modular converter (ADC0890) [4] again and be delivered to central processor unit CPU (89C51) [5] through μ, the i signal of current transformation unit [2], voltage transformation module [3], μ, i ingoing power factor angle measuring unit [1], be transformed to the digital quantity that is in proportion with and directly import central processor unit CPU (89C51) [5] through synthetic, and in CPU, calculating the size of cos , voltage signal also will pass through PT compensating unit [9] in the middle of measuring.The magnitude of voltage that PT compensating unit [9] is measured PT secondary side initiating terminal and magnitude of voltage that the metering circuit entrance point is measured relatively after, difference DELTA U is delivered to central processor unit CPU (89C51) [5] after the A/D conversion.As calculated, CPU will send control signal by parallel interface (8155) [6].Also can realize man-machine the connection through parallel interface (8155) [6] CPU with keyboard input unit [7].The control signal of sending through parallel interface (8155) [6] has: reactive power source switching signal, PT secondary side compensating signal and possible overvoltage protection signal and capacitor set discharge alarm signal.In addition, capacitor discharge alarm unit [10] also will directly send the signal of excision capacitance group according to the capacitor discharge voltage, and by A/D converting unit [4] report CPU [5]; Protection voltage regulation unit [12] also will according to circumstances send capacitor overvoltage protection signal.These signals will be compensation condenser group [14] by performance element [11] control thyristor power model [13] control reactive power source unit all.The utility model also can external metering units [15] if needed.
Among Fig. 2, YH is a voltage transformer, and LH is a current transformer, LH B1, LH B2Be power pack.Voltage V ABThrough YH1, YH2 transformation, again behind RD1, DZ1 rectification bridge block, R1, C1 rectifying and wave-filtering, on R2, form voltage U 1 (0～5V), be delivered to the A/D modular converter then and be transformed to digital signal.Electric current I BThrough current transformer LH, power pack LH B1, LH B2After obtain and electric current I BThe electric current I of proportional and homophase B1, I B2I wherein B1When positive half cycle through D6, D7, R5, R6 and be added in voltage V on the Voltage stabilizing module 7805 ABThe stack of positive half cycle form digital signal U2 (0 or 5V, i.e. low level or high level) and be delivered to CPU (89C51), can obtain power-factor angle as calculated; And I B2Through RD2, rectification bridge block DZ2, R7, C2 rectifying and wave-filtering, on R8, can obtain and electric current I BProportional voltage U 3 (0～5V), be delivered to the A/D modular converter then and be transformed to digital signal.

Claims (1)

1; a kind of generator intelligent expansion joint electric installation of exerting oneself entirely; it is by intelligent reactive power controller GZK; compensating unit [9]; performance element [11]; protection voltage regulation unit [12]; thyristor module [13]; reactive power source device [14] and external metering units compositions such as [15]; it is characterized in that respectively from electric current and voltage transformer CT; PT measures u; electric quantity signals such as i and angle thereof; deliver to reactive power compensating controller GZK; detect through its each unit; after the intelligent processing such as comparison and calculating; send the switching signal respectively; the overvoltage protection signal is given performance element [11]; control thyristor module [13]; switching reactive power source device [14]; other has the PT compensating signal to give compensating unit [9]; after Intelligent treatment; its signal is imported external metering units [15] respectively and is fed back to the GZK device; generator G1 is through protection voltage regulation unit [12]; absorb the reactive power that export [14] by [13], the active power after its compensation is through transformer T 1Flow to electrical network, the efficient electricity-saving operation realizes exerting oneself entirely.
CN 03256908 2003-05-15 2003-05-15 Full output intelligent compensation power saving device for generator Expired - Fee Related CN2742651Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 03256908 CN2742651Y (en) 2003-05-15 2003-05-15 Full output intelligent compensation power saving device for generator

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Application Number Priority Date Filing Date Title
CN 03256908 CN2742651Y (en) 2003-05-15 2003-05-15 Full output intelligent compensation power saving device for generator

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CN2742651Y true CN2742651Y (en) 2005-11-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102622028A (en) * 2012-02-29 2012-08-01 东莞市星火太阳能科技股份有限公司 Control circuit of controller of solar power generation system
CN103117549A (en) * 2013-01-11 2013-05-22 韦琪 Method and device for improving overload capacity of alternating-current generator
CN113824159A (en) * 2021-09-14 2021-12-21 中腾微网（北京）科技有限公司 Adaptive control microgrid reactive power regulation method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102622028A (en) * 2012-02-29 2012-08-01 东莞市星火太阳能科技股份有限公司 Control circuit of controller of solar power generation system
CN103117549A (en) * 2013-01-11 2013-05-22 韦琪 Method and device for improving overload capacity of alternating-current generator
CN113824159A (en) * 2021-09-14 2021-12-21 中腾微网（北京）科技有限公司 Adaptive control microgrid reactive power regulation method

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