CN2088304U - Power-economizing automatic controller for use in networks - Google Patents
Power-economizing automatic controller for use in networks Download PDFInfo
- Publication number
- CN2088304U CN2088304U CN 90222205 CN90222205U CN2088304U CN 2088304 U CN2088304 U CN 2088304U CN 90222205 CN90222205 CN 90222205 CN 90222205 U CN90222205 U CN 90222205U CN 2088304 U CN2088304 U CN 2088304U
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- circuit
- control device
- electrical network
- chip microcomputer
- single chip
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Abstract
The utility model belongs to an automatic controller for use in electric network, which adopts monolithic microcomputer control. The utility model is characterized in that a parallel interface circuit and an automatic malfunction reset circuit are provided; a testing circuit is provided with a low energy filter, a current transformer TA, an inverting amplifier, a linear rectifier and a bidirectional controlled silicon; the voltage, the electric current and the power factor of the electric network can be exactly tested. The switching quantity of a capacitor is controlled according to the control method that arranged power factor and reactive power is used as control quantity; ineffective switching is more effectively prevented; switching oscillation is suppressed; no contact output is realized. The controller is used for automatic control for parallel capacitors in electric network.
Description
The utility model belongs to a kind of electric network reactive compensation automatic control equipment.
Electrical network rated capacity S=3UI, be that specified phase voltage and specified phase current are long-pending, and power consumption equipment is P=UIcos φ to the actual work done generation of load power, need this moment from electrical network absorbing reactive power Q=3UIsin φ, be equivalent to have in the electrical network electric current of Isin φ not do work, only between power supply and power consumption equipment, exchange, and produce reactive power.Thereby increased line loss, and reduced net capacity and voltage, increased production cost, reduced economic benefit of enterprises.The normal now power consumption equipment The parallel power condenser that adopts is adjusted its capacity, to improve the power factor of electrical network.At present existing is the control core device with the microprocessor, is with in-phase voltage U as Chinese patent CN89201007 Reactive Power Compensation Automatic Controller
With electric current I
Obtain φ behind the two square wave XORs
Signal is measured φ with commutator pulse
Width obtain power-factor angle φ.Its weak point is to be subject to the interference that mains frequency variation and voltage, current amplitude change, and it is accurate inadequately that power factor is detected, thereby influence control precision.And output adopts relay, owing to be that contact output is arranged, produces the shortcoming of spark interference microcomputer when existing relay to burn out easily to open and close with the contact.
The purpose of this utility model is that a kind of improved reactive compensation automatic control device will be provided, it is voltage, electric current and the power factor of detection of grid more accurately, and can more effectively prevent invalid switching and suppress throw in-of oscillation by a kind of switching that comes control capacitor in two kinds of control modes of power factor, reactive power of setting.Realize contactless output, make device work more reliable.
The purpose of this utility model is achieved in that adopting chip microprocessor is the calculation control device of core, detection of grid power factor and voltage, current signal, and control drops into capacitor group number.The utility model comprises testing circuit 3, calculation control device 1, output circuit 2, data display circuit 4.BC phase voltage Ubc and A phase current Ia after mutual inductor sample, amplification, comparison circuit shaping, are obtained square-wave signal U
And I
, Ubc, Ia convert CPU in the digital quantity input single chip microcomputer to by A/D converter after amplification, rectification, filtering simultaneously.CPU is in a power frequency period, according to U
, I
Priority and be in logic high and low level time, calculate the big or small and positive and negative of actual power factor angle φ.Other is by I, the U numerical value of A/D converter, when being controlled quentity controlled variable with the reactive power, calculate reactive power Q c=Px(Tg φ-Tg φ ' that electrical network need compensate according to the power-factor angle φ ' that sets), and calculate the capacitor group number that should drop into, switching (throw afterwards earlier and cut), switching cycle (throw earlier and cut earlier), coding switching are (by 8421 yards branch distribution capacities in order, promptly back one pool-size is last group two times) a kind of in three kinds of switching modes, the capacitor group number that control drops into.CPU delivers to data latches with control signal, and drives external contactor by bidirectional triode thyristor.If when being controlled quentity controlled variable with the power factor, before dropping into electric capacity, judge whether system is in the throw in-of oscillation state earlier, as no throw in-of oscillation state, then drop into electric capacity, write down current power factor, voltage, electric current simultaneously; As having throw in-of oscillation, then calculation control device locking is till power factor, voltage, electric current change.
Give the program that is solidified with this control system earlier in the memory of the utility model electrical network energy-saving controller, the requirement according to program flow diagram with different chips shown in Figure 4 is easy to write out source program.
Be that integrated package in the calculation control device 1 of core can have various model with the single chip microcomputer, thereby form different version.Single chip microcomputer (IC1) can adopt 8031, latch (IC3) can adopt 74LS373, and program storage (IC2) can adopt EPROM2732, and A/D converter (IC4) can adopt ADC0809, decoding circuit (IC7) can adopt CD4001, and parallel interface (IC5) can adopt 8255.The structure of the calculation control device of being made up of above-mentioned model integrated package 1 is fairly simple a kind of.And be provided with the given potentiometer W1 of power factor, the given potentiometer W2 of control rate.
Automatic fault reset circuit (1-1) in the calculation control device 1 is made up of more piece RC integration time-delay multi-resonant oscillating circuit, triode BG, is connected on single chip microcomputer (IC1) and parallel interface 8255(IC5) between the Pb mouth.When the microcomputer operate as normal, this circuit obtains " normally " working signal that single chip microcomputer (IC1) regularly sends; When unusual, timing signal disappears, this circuit starting of oscillation, and the output enabling signal forces the CPU of single chip microcomputer (IC1) to restart, and recovers operate as normal.
Detect amplifying circuit various structure can be arranged, detection amplifying circuit 3 of the present utility model is by voltage transformer TV, zero-crossing comparator (3-1), rectifier diode D1, D2, low pass filter (3-2), voltage comparator G1, G2, current transformer TA(is 5A-0.025A), inverting amplifier (3-4), linear rectifier (3-3), the given potentiometer W3 of overvoltage, given potentiometer W4 of undercurrent and resistance R 6, R7, R8 form.Its voltage input end BC phase voltage instrument transformer that gets access to grid, the current input terminal A phase current mutual inductor that gets access to grid, output and calculation control device 1 join.
Output circuit also can have different structures.The utility model output circuit 2 is by reverse drive door UL2003(IC8), photoelectric coupling circuit (TD), bidirectional triode thyristor (SCR) and resistance R 5, R10, R11 form, and are connected between calculation control device 1 and the A.C. contactor KM.
The utility model is owing to adopt said structure, can more effectively reduce because mains frequency variation and voltage, current amplitude change the error of the detection power factor that causes, prevents various interference, suppresses vibration, prevents invalid switching, obtains compensation effect preferably.And can when being subjected to forceful electric power and magnetic interference microcomputer and sinking into endless loop, can start automatically, recover operate as normal, improved reliability, having overcome has contact output contact easy burn-out and produces the shortcoming of disturbing.Its circuit is simple, and is with low cost, easy to install, applied widely, all can use for the harbour that factory and network load alter a great deal.
The energy-conservation automatic controller structure chart of accompanying drawing 1--electrical network
Among the figure: the 1--calculation control device
The 2--output circuit
3--detects, amplifying circuit
The digital display circuit of 4--
The energy-conservation automatic controller calculating control circuit of accompanying drawing 2--electrical network electrical schematic diagram
Accompanying drawing 3--detects, the amplifying circuit electrical schematic diagram
Accompanying drawing 4--program flow diagram
The utility model is described in further detail below in conjunction with embodiment: voltage signal Ubc after the voltage transformer TV conversion in the amplifying circuit 3, through zero-crossing comparator (3-1), becomes voltage square wave U after testing
, enter interface circuit 8255(IC5 in the calculation control device 1) Pc.2, enter the PO mouth of single chip microcomputer (IC1) via bus DB.Current signal Ia in the amplifying circuit 3 after the current transformer TA conversion, amplifies through inverting amplifier (3-4) after testing, and zero-crossing comparator (3-1) shaping becomes electric current square wave I
, enter interface circuit 8255(IC5 in the calculation control device 1) Pc.3, enter the PO mouth of single chip microcomputer (IC1) via bus DB, by inquiry with calculate, obtain current power factor of electric network by single chip microcomputer (IC1).Simultaneously, voltage signal becomes accurate direct current signal through diode D1 rectification through low pass filter (3-2), wherein one the tunnel enter voltage comparator G1, its output enters the Pc.1 of interface circuit in the calculation control device 1 (IC5), another road enters the analog channel IN5 of A/D converter in the calculation control device 1 (IC4), binary signal enters the PO mouth of single chip microcomputer (IC1) by bus DB after conversion, to judge whether overvoltage and to write down current voltage.After the current signal conversion, become voltage signal through inverting amplifier (3-4) through R8, low pass filter (3-2), enter the analog channel IN4 of A/D converter in the calculation control device 1 (IC4), after conversion, become digital signal, the PO mouth through bus DB enters single chip microcomputer (IC1) obtains current current signal.The output of inverting amplifier (3-4) simultaneously enters voltage comparator G2 through low pass filter (3-2), and its output enters interface circuit 8255(IC5 in the calculation control device 1) Pc.0, enter single chip microcomputer (IC1) through bus DB, judge whether undercurrent.
Adjust precision signal and set,, enter single chip microcomputer (IC1) through bus DB through the analog channel IN6 conversion of A/D converter (IC4) by W1.The control rate signal is set by W2, through the analog channel IN7 conversion of A/D converter (IC4), enters single chip microcomputer (IC1) through bus DB.Single chip microcomputer (IC1) is according to current power factor, voltage, electric current and signals such as precision, control rate are set, at the prerequisite that does not the produce invalid switching switching capacitance of whether making decision, calculate the switching capacity, control signal is delivered to interface circuit 8255(IC5 through bus DB) the Pa mouth, drive photoelectric coupling circuit (TD) through reverse drive door (IC8), the conducting and the shutoff of control bidirectional triode thyristor (SCR) are to drive external contactor.The current power factor is by the P1 mouth and the interface circuit 8255(IC5 of single chip microcomputer (IC1)) the Pb mouth send digital display circuit 4 to show.
Gate circuit (IC6) and triode BG, resistance R 1, R2, R3, R4, capacitor C 2, C3, C4 constitute the automatic fault reset circuit.Wherein gate circuit (IC6) is connected into more piece RC integration time lagged type multivibrator with resistance, electric capacity, and BG is the discharge triode, constitutes the discharge loop of capacitor C 4.In case single chip microcomputer (IC1) is through interface circuit 8255(IC5) timing signal that provides of Pb mouth disappears, and promptly starting of oscillation resets single chip microcomputer (IC1) automatically.
Claims (4)
1, a kind of electrical network energy-saving control device has single chip microcomputer (IC1), latch (IC3), and memory (IC2), digital to analog converter (IC4), testing circuit 3, output circuit 2 is characterized in that having parallel interface (IC5); Automatic fault reset circuit (1-1); Testing circuit 3 is provided with low pass filter (3-2), current transformer TA, sign-changing amplifier (3-4), linear rectifier (3-3).
2, electrical network energy-saving control device according to claim 1 is characterized in that parallel interface (IC5) is 8255, and current transformer TA is 5A-0.025A.
3, electrical network energy-saving control device according to claim 1 and 2, it is characterized in that automatic fault reset circuit (1-1) is made up of more piece RC integration time lagged type multi-resonant oscillating circuit, triode BG, be connected on single chip microcomputer (IC1) and parallel interface 8255(IC5) between the Pb mouth.
4, electrical network energy-saving control device according to claim 1 and 2, it is characterized in that output circuit 2 is by reverse drive door UL2003(IC8), photoelectric coupling circuit (TD), bidirectional triode thyristor (SCR) and resistance R 5, R10, R11 form, and are connected between calculation control device 1 and the A.C. contactor KM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90222205 CN2088304U (en) | 1990-10-11 | 1990-10-11 | Power-economizing automatic controller for use in networks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90222205 CN2088304U (en) | 1990-10-11 | 1990-10-11 | Power-economizing automatic controller for use in networks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2088304U true CN2088304U (en) | 1991-11-06 |
Family
ID=4900190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90222205 Expired - Lifetime CN2088304U (en) | 1990-10-11 | 1990-10-11 | Power-economizing automatic controller for use in networks |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2088304U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100459363C (en) * | 1999-09-30 | 2009-02-04 | 西门子公司 | Method for recognizing oscillation in electric supply network |
| CN105790284A (en) * | 2016-04-27 | 2016-07-20 | 国网山东省电力公司济南市长清区供电公司 | Reactive compensation control system and reactive compensation control method based on fuzzy control |
-
1990
- 1990-10-11 CN CN 90222205 patent/CN2088304U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100459363C (en) * | 1999-09-30 | 2009-02-04 | 西门子公司 | Method for recognizing oscillation in electric supply network |
| CN105790284A (en) * | 2016-04-27 | 2016-07-20 | 国网山东省电力公司济南市长清区供电公司 | Reactive compensation control system and reactive compensation control method based on fuzzy control |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |