CN201975794U

CN201975794U - Substation voltage reactive power synthetic control device based on short-term load forecasting

Info

Publication number: CN201975794U
Application number: CN2011200339510U
Authority: CN
Inventors: 周志勇; 王毅; 黄萍; 邹振宇; 信珂; 杨守义; 赵国生
Original assignee: Zhengzhou University; Shandong Electric Power Engineering Consulting Institute Corp Ltd
Current assignee: Zhengzhou University; Shandong Electric Power Engineering Consulting Institute Corp Ltd
Priority date: 2011-01-31
Filing date: 2011-01-31
Publication date: 2011-09-14
Anticipated expiration: 2021-01-31

Abstract

The utility model relates to a substation voltage reactive power synthetic control device based on short-term load forecasting which combines conventional nine-zone diagram control method with short-term load forecasting result for eliminating primary variation joint adjusting and capacitor switching and oscillating problems resulting from short-term interference load. A CPU circuit board of the utility model executes all functions of operating, judging and data recording of substation voltage reactive power synthetic control based on short-term load forecasting; an inlet/outlet circuit board provides tap position information and switch state information of the primary variation joint to CPU and transmits instruction information sent by the CPU to an execution mechanism; an analogue signal input circuit board converts electric strength electric signals into weak current signals needed by the CPU circuit; a liquid crystal display circuit board provides an operating interface and data display and state viewing window to field staff; and a switch circuit board converts signals between circuit boards.

Description

Transforming plant voltage reactive composite control apparatus based on short-term load forecasting

Technical field

The utility model belongs to quality of power supply control field, is specifically related to a kind of transforming plant voltage reactive composite control apparatus based on short-term load forecasting.

Background technology

Transforming plant voltage reactive Comprehensive Control (VQC) system is an important content of power department quality of power supply management, it is for improving quality of voltage, keep reactive balance, reducing network loss has great significance, present newly-built transformer station all requires to equip the VQC device, realize that by this device the main transformer tap is regulated and the switching operation of compensation capacitors, the control principle of present transforming plant voltage reactive general controller all is to adopt nine traditional district figure control strategies, this can occur two kinds of fortuitous events in actual applications, first kind is that the short-term load disturbs frequent adjusting and the throw in-of oscillation problem that causes, second kind is unreasonable continuous several times adjusting and the switching problem that causes of control strategy cooperation between the superior and the subordinate, at present there not be way well solving to disturb by the short-term load on the frequent adjusting that causes and the throw in-of oscillation problem, the just simple way (promptly setting the time-delay of adjustment time-delay of main transformer tap and compensation capacitors switching respectively) that adopts artificial setting action delay, but this can bring a lot of problems, (1) time-delay is provided with too short can only playing and guarantees that electrical network breaks down under the situation, device escapes not misoperation fault time, and the duration is appearring when setting the shorter load fluctuation of time-delay, control device can not escape; (2) though being provided with, time-delay longly can play the effect that auto levelizer escapes shorter load fluctuation of duration, and unfavorable to power grid operation, even can cause some special supply load cisco unity malfunctions (as rolling mechanical, electrical iron, arc furnace etc.).Therefore, it is unscientific preventing throw in-of oscillation and regulate frequent phenomenon by the way that time-delay simply is set, and does not reach expected effect.

Up to the present, preventing throw in-of oscillation by the way that action delay is set in the VQC of transformer station falls flat with the frequent problem of adjusting.

The utility model content

The purpose of this utility model is exactly to regulate frequent and capacitor switching oscillation problem for solving the transforming plant main transformer tap, a kind of transforming plant voltage reactive composite control apparatus based on short-term load forecasting has been proposed, this control device combines traditional nine district figure control methods and short-term load forecasting result, is used to eliminate adjusting of main transformer tap and the capacitor switching oscillation problem that the short-term interference load causes.

For achieving the above object, the utility model adopts following technical scheme:

A kind of transforming plant voltage reactive composite control apparatus based on short-term load forecasting, it comprises cpu pcb, cpu pcb with open into the digital output circuit two-way communication; The cpu pcb input is connected with the analog signal input circuit plate simultaneously, and the cpu pcb output is connected with switching circuit board, and switching circuit board is connected with display unit, and the switching power circuit plate is each circuit board power supply simultaneously.

Described display unit is the liquid crystal display circuit plate.

The utility model comprises cpu pcb, open into the digital output circuit plate, the analog signal input circuit plate, the switching power circuit plate, the liquid crystal display circuit plate, switching circuit board, wherein cpu pcb is responsible for carrying out all computings based on the transforming plant voltage reactive Comprehensive Control of short-term load forecasting, judge and data recording function, open into the digital output circuit plate and be used for the gear information and the on off state information of main transformer tap are offered cpu circuit, the command information that CPU is sent sends actuator to simultaneously, the analog signal input circuit plate is used for voltage, the forceful electric power conversion of signals of current transformer output is the required weak electric signal of cpu circuit, the liquid crystal display circuit plate shows for the Field Force provides operation interface and data, the state observation window, the switching power circuit plate is responsible for cpu pcb, open into the digital output circuit plate, the liquid crystal display circuit plate provides ± 5V, 12V, the 24V working power, switching circuit board carries out the signal converting between each circuit board.

Method of work of the present utility model is: this control device writes down transformer station's reactive power at times, voltage, main transformer tap gear and capacitor switching information, carrying out the out-of-limit situation of voltage power-less simultaneously judges, when transforming plant voltage reactive is all in the scope of setting, do not carry out adjusting of main transformer tap and the operation of capacitor group switching, when occur voltage or idle in one or two when out-of-limit, call the reactive power in the past and the voltage data information of record, utilize the short-term load forecasting theory, judging this load fluctuation is very short short-term load fluctuation or long-term load variations of duration, then do not carry out the adjusting operation if be judged as the very short short-term load fluctuation of transformation period, can cause that the main transformer tap is regulated or the load fluctuation of throw in-of oscillation if be judged as, then carry out escaping this tap is regulated or the time-delay of throw in-of oscillation after restart nine district figure control strategies and carry out voltage power-less and regulate and judge, if it is long and can not cause the load fluctuation of regulating vibration in a short time to be judged as transformation period, then directly start nine district figure control strategies and carry out voltage power-less adjusting judgement, and operate according to judged result decision execution adjustment tap or switching capacitance.

Compared with prior art, the transforming plant voltage reactive composite control apparatus based on short-term load forecasting of the present utility model has following characteristics:

1, the transforming plant voltage reactive composite control apparatus based on short-term load forecasting of the present utility model combines traditional voltage power-less nine district figure control strategies with the short-term load forecasting result, figure control strategy in Yi Jiu district is the main criterion of action, with the assistant criteria of short-term load forecasting result as action.

2, the transforming plant voltage reactive composite control apparatus based on the short-term load forecasting of the present utility model main transformer tap that can reduce the transformer station that the short-term load fluctuation causes is regulated frequent, capacitor group throw in-of oscillation problem.

3, the transforming plant voltage reactive composite control apparatus based on short-term load forecasting of the present utility model can write down data such as the load or burden without work of transformer station and voltage at times, and preserved with document form data, use and data query when being convenient to short-term load forecasting.

Description of drawings

Accompanying drawing 1 is the control principle block diagram of the transforming plant voltage reactive composite control apparatus based on short-term load forecasting of the present utility model;

Accompanying drawing 2 is the hardware circuit figure of the transforming plant voltage reactive composite control apparatus based on short-term load forecasting of the present utility model.

Wherein, the 1.CPU circuit board is 2. opened into the digital output circuit plate, 3. analog signal input circuit plate, 4. switching power circuit plate, 5. liquid crystal display circuit plate, 6. switching circuit board.

Embodiment:

Show as Fig. 2: it is mainly by cpu pcb 1, open into digital output circuit plate 2, analog signal input circuit plate 3, switching power circuit plate 4, liquid crystal display circuit plate 5, switching circuit board 6, six circuit board plug-ins constitute, these six circuit board plug-ins are concentrated and are placed in the 6U industry control cabinet, cpu pcb 1 wherein is responsible for carrying out all computings based on the transforming plant voltage reactive Comprehensive Control of short-term load forecasting, judge and data recording function, open into digital output circuit plate 2 and be used for the gear information and the on off state information of main transformer tap are offered cpu circuit, the command information that CPU is sent sends actuator to simultaneously, analog signal input circuit plate 3 is used for voltage, the forceful electric power conversion of signals of current transformer output is the required weak electric signal of cpu circuit, liquid crystal display circuit plate 5 shows for the Field Force provides operation interface and data, the quantity of state observation window, switching power circuit plate 4 is responsible for cpu pcb 1, open into digital output circuit plate 2, liquid crystal display circuit plate 5 provides ± 5V, 12V, the 24V working power, the signal converting that switching circuit board 6 carries out between each circuit board.

Fig. 1 shows: after the transforming plant voltage reactive composite control apparatus start operation based on short-term load forecasting, automatically write down voltage at that time, idle, capacitor group switching information and main transformer tap gear information, work as later voltage, idle when having certain amplitude to change or gear, when changing, switching information gives record automatically, and these data are stored in the data file mode, in voltage or idle real time data occurring, have one or two exceed setting on, during lower limit, (got 1～2 minute through after the of short duration time-delay, line voltage and idle transient swing when escaping fault) still exceed restriction, then start switching capacitance and tap and regulate determining program, when if present data volume does not reach the short-term load forecasting desired data less, then directly enter nine district figure control strategies action determining program, judging is to carry out switched capacitor operation or tap adjustment operation; When if present data volume reaches the desired data volume of short-term load forecasting, start the short-term load forecasting criterion, judge current load fluctuation and whether be disturbance load in short-term, if short-term interference load, then do not carry out and adjust action, if be judged as is that the interference of non-short-term load causes, then start gear adjustment or switching capacitance and operate the determining program that whether vibrates, see if adjust operation whether oscillatory occurences (throw in-of oscillation or tap transfer vibration take place in a short period of time, if oscillatory occurences takes place, then carry out escaping this vibration delay process, utilizing nine district's figure control strategies to judge then, whether determine executable operations; If be judged as stable long-term load variations, then carry out nine district figure control strategies and judge it is that the operation of main transformer tap is adjusted in operation of execution switching capacitance or execution, and send corresponding adjustment and instruct according to the short-term load forecasting result.

Claims

1. the transforming plant voltage reactive composite control apparatus based on short-term load forecasting is characterized in that it comprises cpu pcb, cpu pcb with open into the digital output circuit two-way communication; The cpu pcb input is connected with the analog signal input circuit plate simultaneously, and the cpu pcb output is connected with switching circuit board, and switching circuit board is connected with display unit, and the switching power circuit plate is each circuit board power supply simultaneously.

2. the transforming plant voltage reactive composite control apparatus based on short-term load forecasting as claimed in claim 1 is characterized in that described display unit is the liquid crystal display circuit plate.