CN201893558U - Active power filter and dynamic reactive power comprehensive compensation control device - Google Patents

Abstract

The utility model discloses an active power filter and dynamic reactive power comprehensive compensation control device, which is realized by the way that: the active power filter and dynamic reactive power comprehensive compensation control device is provided with a main controller which comprises two digital signal processors (DSP) and a field programmable gate array (FPGA), the input control end of the main controller is connected with 12 paths of parallel circuits of current and voltage signals and voltage signals on two ends of an inverter direct-current capacitance, the input and the output control ends are connected with a power factor controller (PFG) and a liquid crystal touch screen through optical fibers, and the output control end is respectively connected with 8 paths of parallel circuits of alternating-current contactors, relay control ends and an active power filter (APF) which is driven by a pulse modulation signal. The active power filter and dynamic reactive power comprehensive compensation control device not only can filter the harmonic wave and continuously and dynamically compensate the reactive power, but also can realize the optimized control of the reactive and the power factors, so a great amount of dynamic reactive storage is provided to an electric power system, and an important effect on stabilizing the voltage of the bus-bar, compensating the reactive power of a distribution network and inhibiting the waveform distortion can be realized.

Description

Active power filtering and dynamic reactive power comprehensive compensation control device

Technical field: the utility model relates to the control device of electric power system, particularly relates to a kind of control device that active power filtering and dynamic reactive power is carried out comprehensive compensation.

Background technology: along with the extensive use of the numerical control device and the power electronic equipment of computer and network, make the power load structure in the electric power system that change take place, or reduction and destruction that impact load cause the quality of power supply non-linear as converter plant, arc furnace, electric railway etc.Idle and the harmonic wave pollution problem that nonlinear-load causes has all brought serious harm for electric power system, power supply department and power consumer.The increase of idle and harmonic content in the electrical network will cause the lost of life of electric equipment, and network loss increases, and the possibility of system's generation resonance increases, and can cause dangerous overvoltage, overcurrent when serious.Also may cause relaying protection and automatics misoperation, instrument indication and a series of problems such as watt metering is inaccurate, interfere with communications system simultaneously.And dynamic power quality badly can bring enormous economic loss.Therefore this problem has become the frontier nature problem of electrical field, its index of correlation and improvement measure has been done a large amount of research both at home and abroad.China has issued the GB of 6 power quality indexs up to now.Wherein " quality of power supply utility network harmonic wave " (GB/T 14529-1993) stipulated total percent harmonic distortion of each electric pressure, the limits value of each single odd voltage harmonic containing ratio and each single even voltage harmonic containing ratio.To satisfy the higher demand of people to the quality of power supply.

In order to solve the dynamic power quality problem, mainly by capacitor, to reach the purpose that improves load power factor for reactive power compensation, just this method only can obtain optimum efficiency when load constant at a load two ends constant volume in parallel.At the load that changes, the main at present mode that adopts capacitor, reactor grouping switching, as be under the jurisdiction of the thyristor control capacitor (TSC), thyristor-controlled reactor (TCR) etc. of static var compensator (SVC).But still the oscillation problem of ubiquity undercompensation and overcompensation and handoff procedure also may produce resonance phenomena in system.And for the harmonic pollution problem that nonlinear-load causes, the influence of mainly adopting the passive filter of the characteristic frequency that inductance and electric capacity forms to come harmonic carcellation.Comprise multiple harmonic components as load current, then the harmonic wave at different frequency all will be provided with corresponding resonant circuit, and this will increase the complexity of system, reduces the reliability of using.

From research find that active filter (APF) has good filtering characteristic, and not can with system's generation resonance.Yet because the restriction of high-power turn-off device (GTR, GTO, IGBT) development level, active filter (APF) can not be born the requirement of high voltage, the inhibition of jumbo nonlinear-load AC system side harmonic wave.In order to satisfy the filtering requirements of big capacity nonlinear-load, from the nineties in last century so far the someone imagination that various APF and PF carry out mixed filtering has been proposed.Be active power filtering and dynamic reactive power comprehensive compensating device.Active power filtering and dynamic reactive power comprehensive compensating device have been taken into account both advantages, and initial investment is little, and the cost performance height can satisfy the requirement of high-voltage large-capacity system practicability, are the development models that has broad prospect of application in the present engineering.Yet, still exist the contradiction between the comprehensive compensation filter effect and the stability of a system, promptly how to coordinate control, the technical barrier that improves system performance and stability has to be solved.

Summary of the invention: the purpose of this utility model provides a kind of active power filtering and dynamic reactive power comprehensive compensating device, it can effectively compensate each harmonic, suppress flickering, compensating reactive power, the harmonic wave that automatic tracking and compensating changes and idle, improve power factor, improve distribution network electric energy quality, and can coordinate to solve the contradiction between the comprehensive compensation filter effect and the stability of a system.

Scheme of the present utility model is as described below: this utility model includes source filter (APF), reactive power compensator (TSC), power factor controller (PFC) and liquid crystal touch screen, it is the master controller that is made of two digital signal processors (DSP) and a field programmable gate array (FPGA) by being provided with, and master controller imported control end and 12 tunnel parallel electric currents, voltage signal and inverter dc capacitor both end voltage signal are connected, connect power factor controller (PFC) and liquid crystal touch screen at the input and output control end through optical fiber, and with output control terminal respectively with 8 tunnel parallel A.C. contactors, relay control end and be connected by the active filter (APF) that pulse-modulated signal drives is realized.

This utility model is owing to taked described structure, particularly utilize master controller to implement dynamically the synchronous acquisition of signal down, the detection computations of harmonic wave, the processing controls of data, and by Optical Fiber Transmission realization and power factor controller, the interactive mode of liquid crystal touch screen and master controller is coordinated control, with harmonic wave make electric current and reactive power compensation amount calculate the control output parameter, employing is based on the contrary Control current tracking and controlling method of average current step-length, driven and controlled the pwm pulse that full control switch is opened and turn-offed, realize the data communication of full duplex, improve system response time and data-handling capacity.This invention can realize nonlinear-load harmonic wave inhibition fast, accurately and reactive power compensation.Suppress flickering simultaneously, improve power factor, especially thoroughly solved the contradiction between the comprehensive compensation filter effect and the stability of a system, all have important positive role and wide application prospect administering Harmonious Waves in Power Systems, the improvement raising quality of power supply etc.Moreover, this invention also has reasonable, the continuous characteristics such as control is accurate, stable and reliable working performance, suitable popularization easy to use of regulating of scientific structure design.

Description of drawings:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a master controller structural representation of the present invention;

Fig. 3, Fig. 4 are that the present invention drops into preceding system voltage/current waveform and system side power relevant statistics;

Fig. 5, Fig. 6 only drop into TSC system voltage/current waveform and system side power relevant statistics;

Fig. 7, Fig. 8 are APF and TSC equal input coefficient voltage/current waveform and system side power relevant statistics;

Embodiment:

Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is to be to implement under the prerequisite with the technical scheme, and protection scope of the present invention is not limited to following embodiment.

Active power filtering of the present invention and dynamic reactive power comprehensive compensation control device (referring to Fig. 1), be a kind of novel dynamic compensating device, include source filter (APF) 1, reactive power compensator (TSC) 2, power factor controller (PFC) 3, liquidcrystal touch screen 5 and by two digital signal processors (TSC) 2, power factor controller (PFC) 3, liquidcrystal touch screen 5 and the master controller (DSP+FPGA) 4 that constitutes by existing programmable gate array (FPGA) the 8 Combination Control plates in 6,7 and fields of two digital signal processors (M_DSP, S_DSP).Whereinactive filter 1 is by three single-phase voltage source inventers, DC side large value capacitor with exchange output filter and constitute.It with voltage source inverter as main member, employing is based on the pulse-width modulation PWM inverter of intelligent IGBT module, dc terminal is the support of a big electric capacity as dc voltage, it is online that output is connected in parallel on the 400V low-voltage distribution through the LCL filter branch, with this high frequency burr that comes filtering switching device break-make to cause.Dynamic reactive power compensator 2 is made of thyristor inverse parallel switch and capacitor group.The electrical wiring of reactive power compensator 2 is the thyristor switchable capacitor branch road of three groups of serial connection harmonic elimination reactors, and all (TSC) branch roads all are articulated on the 220V bus.Wherein, the thuristor throw-in and throw-off control signal is sent by power factor controller 3, and this power factor controller 3 is connected with master controller 4 optical fiber communications, thereby and carries out the reactive power compensation of Interactive control under realizing dynamically with master controller 4.Described master controller 4 is the utility model important component parts, and twodigital signal processors 6,7 wherein are its main operational processing section of master controller 4 as top plate.Triggering control by output pulses is connected withactive filter 1.

Master controller 4 is formed (referring to Fig. 2) by bottom control plate (Main_Controller_Bottom) and upper strata control board (Main_Controller_Top) two parts, wherein, the bottom control plate is mainly the power supply import, the optical-fibre communications mouth, signal sampling, A.C. contactor and relay control and PWM output, input signal is 6 road voltages, 6 road electric currents, Vsa, Vsb, Vsc is a system voltage, Isa, Isb, Isc is a system power, Ifc, Ifb, Ifc is the electric current thatactive filter 1 sends, Vdc_a, Vdc_b, Vdc_c is each phase inverter dc voltage, through overvoltage, behind the current transformer ratio, above-mentioned 12 road voltage and current signals are sent into master controller 4, send into two AD7656 sampling A through overvoltage sensor LEM and current sensor Honeywell, the field that the data of being sampled are sent on the bottom control plate showsprogrammable gate array 8, after the signal of existing 8 pairs of samplings of programmable gate array averages processing, thedigital signal processor 6 that the upper strata control board promptly is made up of two TMS320F2812 chips, 7 control boards that constitute, the 3rd is that expansion is not used.Read operation is carried out in the address of above-mentioned data in the existingprogrammable gate array 8 in 6 pairs of fields of digital signal processor (M_DSP), institute's read data is carried out the calculation control while and liquidcrystal touch screen 5 communications of control algolithm, send parameters such as each phase current voltage and percent harmonic distortion to liquidcrystal touch screen 5, liquidcrystal touch screen 5 shows as man-machine interaction and the control to operating.The data thatdigital signal processor 6 is read send another digital signal processor (S_DSP) 7 to by the field programmable gate array on the control board ofupper strata 8 simultaneously, 7 pairs of harmonic currents of digital signal processor detect, givedigital signal processor 6 with detected harmonic current loopback,digital signal processor 6 sends pwm signal via optocoupler by s operation control, triode, issue drive circuit board (Bottom_Controller) behind the level logic change-over circuits such as homophase device, the pwm signal of four road H bridges and fault feedback signal F_Faulat on each inverter, fault reset signal Fault_Reset sends into drive plate, and the driving of giving IGBT for high-speed RAM with this six road signal via fieldprogrammable gate array 8 on the drive plate is removed to trigger IGBT and produced action.When detecting fault-signal on the drive plate, fault feedback signal F_Fault produces a low pulse-triggered along feeding back to fieldprogrammable gate array 8, and drive plate oneself itself blocks pwm signal simultaneously, forbids the driving of PWM to IGBT.After receiving the fault feedback signal that drive plate sends, fieldprogrammable gate array 8 produces corresponding actions and closes the protection of A.C. contactor separating brake on the bottom control plate.When moving, the high impulse thatdigital signal processor 6 produces a fault reset signal resets to fault-signal next time, makes that PWM continues to send.Digital signal processor 6,7 adopts independently electric power system, by the Optical Fiber Transmission pwm signal, the realization high voltage electrical is isolated, and by the pulse triggering means control thyristor and the insulated gate bipolar transistor IGBT of special use, reliably realizes the coordination control of active power filtering and dynamic reactive power comprehensive compensation.

Fig. 3, Fig. 4 are A phase system voltage/current waveform and system side power relevant statistics forms before integration unit puts into operation, as seen from the figure, current distortion is serious before putting into operation, mainly contain 5,7 inferior leading harmonic waves, phasor power factor is lower, have only about 0.71, and current effective value reached 557A, A phase reactive power reaches 90.64kVar; Fig. 5, Fig. 6 are system voltage/current waveform and system side power relevant statistics forms when only dropping into reactive power compensator TSC, as seen from the figure, after TSC put into operation, the leading mutually harmonic current of A was still bigger, but phasor power factor brings up to 0.92, and A phase reactive power is reduced to 38kVar; Fig. 7, Fig. 8 are system voltage/current waveform and system side power relevant statistics forms after APF and TSC all drop into, as seen from the figure, after this integration unit puts into operation, the leading mutually big high attenuation of harmonic current of A, compensation back current on line side sineization, phasor power factor brings up to 0.95 simultaneously, A phase reactive power is reduced to 23.72kVar, this shows that this comprehensive compensating device can compensating reactive power, can reach the purpose of harmonic carcellation again, and compensation effect is remarkable.

Claims (2)

Translated fromChinese

1.一种有源滤波与动态无功功率综合补偿控制装置，包括有源滤波器(1)、无功功率补偿器(2)、功率因数控制器(3)和液晶触摸屏(5)，其特征在于：该装置通过设置由两个数字信号处理器(6、7)和一个现场可编程门阵列(8)构成的主控制器(4)，并将主控制器(4)输入控制端与12路并行的电流、电压信号以及逆变器直流电容两端电压信号相连接，在输入输出控制端经光纤连接功率因数控制器(3)和液晶触摸屏(5)，而将输出控制端分别与8路并行交流接触器、继电器控制端以及由脉冲调制信号驱动的有源滤波器(1)相连接。1. An active filter and dynamic reactive power comprehensive compensation control device, comprising an active filter (1), a reactive power compensator (2), a power factor controller (3) and a liquid crystal touch screen (5), its It is characterized in that: the device is provided with a main controller (4) composed of two digital signal processors (6, 7) and a field programmable gate array (8), and the main controller (4) input control terminal and The 12-way parallel current and voltage signals and the voltage signals at both ends of the DC capacitor of the inverter are connected, and the input and output control terminals are connected to the power factor controller (3) and the LCD touch screen (5) through an optical fiber, and the output control terminals are connected to the LCD touch screen (5) respectively. The 8-way parallel AC contactor, the relay control terminal and the active filter (1) driven by the pulse modulation signal are connected.2.根据权利要求1所述的有源滤波与动态无功功率综合补偿控制装置，其特征在于：数字信号处理器(6、7)均为TMS320F2812芯片，而现场可编程门阵列(8)为EP1C12Q240I7N芯片。2. active filter according to claim 1 and dynamic reactive power comprehensive compensation control device, it is characterized in that: digital signal processor (6,7) is TMS320F2812 chip, and field programmable gate array (8) is EP1C12Q240I7N chip.

Images