CN106936137A - Comprehensive electric energy quality controlling device and method based on loop voltage - Google Patents

Abstract

The present invention relates to a kind of comprehensive electric energy quality controlling device based on loop voltage and method, calculated by the fundamental wave of positive sequence watt current, harmonic current can be directly obtained, reactive current, the compensation desired value of three's superposition of negative phase-sequence watt current, simultaneously using the control algolithm of loop voltage, directly calculate the dutycycle of PWM ripples output, simplify the complicated calculations process of space vector scheduling algorithm, and it is according to generation trigger pulse sequence with the dutycycle for calculating, insulated gate bipolar transistor IGBT turn-on and turn-off are controlled through IGBT drive circuit, so as to control inversion unit to export, reach compensation desired value.The present invention has elimination mains by harmonics, compensation system is idle, the function of balance three-phase load, the comprehensive universal power quality problem solved existing for power network, improves the quality of power supply of power network simultaneously, has purified power network, optimization power utilization environment, improves equipment operation and operation of power networks reliability.

Description

Comprehensive electric energy quality controlling device and method based on loop voltage

Technical field

The present invention relates to a kind of comprehensive electric energy quality controlling device based on loop voltage and method, more particularly to a kind of base Comprehensive electric energy quality controlling device can be carried out in loop voltage control strategy for mains by harmonics, idle, active imbalance Control method.

Background technology

In social fast-developing today, closely bound up with people's life is exactly the utilization of electric energy.No matter gone back civilian It is industrial circle, the consumption of electric energy is all increasing year by year, it follows therefore that being exactly the quality problems of power supply and electricity consumption.From general Said in meaning, the quality of power supply and electricity consumption includes voltage, the deviation of the stable state of electric current and transient state value, the journey of wave distortion Power supply and electrical problem that degree, flickering etc. are impacted to electrical equipment.At present, with the maximization of power load, precise treatment, Energy-saving, power electronic devices is widely used in a device, causes the quantity of nonlinear-load more and more, gives power network band Substantial amounts of harmonic pollution is carried out；A large amount of with motor use so that the reactive requirement of power network is also increasing；With the people With the increase of equipment, the popularization of intelligent residence, the three-phase load unbalance of distribution is also increasingly severe；These problems are to power network Work operation cause very big potential safety hazard.

Meanwhile, active power filter using active inversion topological structure, the harmonic pollution for power network carries out effectively Improvement；Static reacance generator is capable of the desired value of controlled output for system needs compensating reactive power electric current；Three-phase power balance Device is on the basis of active power filter and static reacance generator, to be mended by the zero sequence in system and negative-sequence current The effect repaid and make power network reach three-phase power balance.Three is effectively administered for the one side of power grid quality, is carried The quality of power network high, has purified power network, and good effect is served during application, has obtained substantial amounts of pushing away Extensively.But, three can only be administered in one aspect, it is impossible to carry out comprehensive control management to three aspects, therefore cannot Improvement to power grid quality is played a part of in all directions, it is impossible to the power utilization environment of equipment is reached optimum optimization.

The content of the invention

According to deficiency of the prior art above, the problem to be solved in the present invention is：There is provided one kind can realize to harmonic wave Pollution, relatively low power factor, the caused power supply of three-phase power imbalance and the comprehensive regulation of power quality problem, can improve electricity Net quality, optimizes power utilization environment, improves the comprehensive electric energy matter based on loop voltage of equipment operation and operation of power networks reliability Amount controlling device and method.

The technical solution adopted for the present invention to solve the technical problems is：

The control method of the described comprehensive electric energy quality controlling device based on loop voltage, comprises the following steps：

Step 1), by system voltage transformer collection voltages signal, the voltage signal of collection is by modulate circuit and AD The digital quantity signal of system voltage is obtained after the analog-to-digital conversion of conversion chip, the digital quantity signal of system voltage is delivered to FPGA and enters After row treatment, actual discrete instantaneous value signal Usa, Usb, the Usc of three-phase system voltage is obtained, calculated by zero passage detection The zero crossing and phase of three-phase system voltage

Current signal is gathered by output current transformer, the current signal of collection is by modulate circuit and AD conversion chip Analog-to-digital conversion after obtain the digital quantity signal of output current, the digital quantity signal of output current is delivered to FPGA treatment Afterwards, the actual discrete instantaneous value signal ia of three-phase output current is obtained_out、ib_out、ic_out；

D. c. voltage signal is gathered by DC voltage transformer, the d. c. voltage signal of collection is by modulate circuit and AD The digital quantity signal of DC voltage is obtained after the analog-to-digital conversion of conversion chip, the digital quantity signal of DC voltage is delivered to FPGA and enters After row treatment, the actual discrete instantaneous value signal of DC voltage is obtained, then the discrete instantaneous value actual to DC voltage Signal carries out the cumulative summation of power frequency time cycle and divided by the sampling number within a power frequency time cycle, obtains straight Stream voltage effective value U_DC；

Load current signal is gathered by load current transformer, load current signal is by modulate circuit and AD conversion core The digital quantity signal of load current is obtained after the analog-to-digital conversion of piece, the digital quantity signal of load current is delivered to FPGA treatment Afterwards, actual discrete instantaneous value signal ila, ilb, the ilc of threephase load electric current is obtained；

Step 2), by step 1) the actual discrete instantaneous value signal Usa of the three-phase system voltage that obtains, Usb, Usc, The zero crossing and phase of three-phase system voltageThe actual discrete instantaneous value signal ia of output current_out、ib_out、 ic_out, DC voltage effective value U_DCDiscrete instantaneous value signal ila, ilb, ilc actual with threephase load electric current calculates harmonic wave Compensation desired value after the superposition together of electric current, reactive current and negative phase-sequence watt current：ia_target、ib_target、ic_target；

Step 3) according to PWM pulse length modulation principles, it is assumed that the service time of each controlling cycle of three-phase IGBT is Ta_on、 Tb_on、Tc_on, the system simplified model according to loop voltage obtains system circuit voltage equation as follows：

I.e.：

Can obtain simultaneously：

Step 4), pass throughCalculate the dutycycle of three-phase PWM ripple respectively, PWM is calculating Dutycycle is according to generation trigger pulse sequence, through IGBT drive circuit control insulated gate bipolar transistor IGBT conducting and pass It is disconnected, so as to control inversion unit to export, reach compensation desired value.

Further preferably, the compensation mesh after the superposition together of described harmonic current, reactive current and negative phase-sequence watt current Scale value ia_target、ib_target、ic_targetCalculating process it is as follows：

(1) positive sequence watt current IP is calculated_P, negative phase-sequence watt current IP_N, positive sequence active component IQ_P, negative phase-sequence reactive current IQ_N

(2) IP that will be obtained_P、IP_N、IQ_P、IQ_NLow-pass filtering treatment is carried out, retains its DC component, obtain positive sequence active Current dc component IP_Pd, negative phase-sequence watt current DC component IP_Nd, positive sequence active component DC component IQ_PdWith the idle electricity of negative phase-sequence Stream DC component IQ_Nd；

(3) threephase load current first harmonics component B_ila0, B_ilb0, B_ilc0 are calculated

In calculating process, remove IP_Nd、IQ_Pd、IQ_NdThe component of three is calculated, then can obtain isolating harmonic current, nothing The active fundametal compoment of positive sequence of work(electric current, negative phase-sequence watt current three-phase：

(3) by load current positive sequence active fundamental current B_ila, B_ilb, B_ilc and momentary load electric current ila, ilb, Ilc obtains containing harmonic current, reactive current, the compensation desired value of negative phase-sequence watt current superposition after subtracting each other：

ia_target=(B_ila)-ila

ib_target=(B_ilb)-ilb

ic_target=(B_ilc)-ilc.

It is further preferably, described step 3) in the system simplified model of loop voltage be：

It is at any time, each in loop along any loop direction of circling in circuit according to circuit loop voltage principle The algebraical sum perseverance of section voltage is zero, after simplifying to system, obtains the single-phase equivalent circuit of system, and loop-voltage equation is：

US-Ud+UL+UR=0

In formula：US is system phase voltage；

Wherein, Δ T：The control time cycle of the PWM under software set control frequency, Ta_on：Service time of the A phases within the control time cycle of PWM；

UL is the voltage at phase reactance two ends：Wherein, ia_targetFor A phases compensate mesh Scale value；ia_outIt is A phase reality output instantaneous values；The inductance value of three-phase output reactance is L；

UR is the partial pressure of system equivalent resistance, due to equivalent resistance very little, is ignored when calculating, and result of calculation is not It is accurate that influence is compensated.

Obtained after arranging equation：

The described comprehensive electric energy quality controlling device based on loop voltage, including system power supply, system power supply is by defeated Go out reactor connection three phase full bridge inversion unit, the electric capacity C1 and electric capacity of the DC side connection concatenation of three phase full bridge inversion unit C2, electric capacity C1 and electric capacity C2 connect DC voltage transformer, the DC voltage collection of DC voltage transformer connection control system Port；

Connection system voltage transformer between described system power supply and output reactance device, the connection control of system voltage transformer The system voltage collection port of system processed, output current transformer is installed between output reactance device and three phase full bridge inversion unit, The output current collection port of output current transformer connection control system, three phase full bridge inversion unit is connected by drive circuit The PWM output ports of control system, the load current collection port connection load current transformer of control system.

It is further preferred, the DC voltage collection port of control system, system voltage collection port, output current collection Port and load current collection port connect AD conversion chip, AD conversion chip by modulate circuit and sampled signal bus respectively FPGA, FPGA connecting communication interface 485CAN and I/O port, the connection of PWM output ports are connected by controlling bus and data/address bus FPGA。

Further preferred, AD conversion chip includes AD01, AD02 and AD03.

The present invention is had an advantageous effect in that：

Comprehensive electric energy quality controlling device and method based on loop voltage of the present invention pass through positive sequence watt current Fundamental wave calculate, can directly obtain harmonic current, reactive current, negative phase-sequence watt current three superposition compensation desired value, The control algolithm of loop voltage can be utilized simultaneously, the dutycycle of PWM ripples output is directly calculated, and simplify the calculation such as space vector The complicated calculations process of method, with elimination mains by harmonics, compensation system is idle, the function of balance three-phase load, while comprehensive solution The universal power quality problem determined existing for power network, improves the quality of power supply of power network, has purified power network, optimizes electricity consumption ring Border, improves equipment operation and operation of power networks reliability.

Brief description of the drawings

Fig. 1 is system structure diagram of the invention；

Fig. 2 is loop voltage rough schematic view of the invention；

In figure, 1, three phase full bridge inversion unit；2nd, output reactance device；3rd, control system；4th, system voltage transformer；5th, bear Carry current transformer；6th, output current transformer；7th, drive circuit；8th, DC voltage transformer；9th, system power supply.

Specific embodiment

Embodiments of the invention are described further below in conjunction with the accompanying drawings：

As shown in Figure 1-2, the control method of the comprehensive electric energy quality controlling device based on loop voltage of the present invention, Comprise the following steps：

Step 1), by system voltage transformer collection voltages signal, the voltage signal of collection is by modulate circuit and AD The digital quantity signal of system voltage is obtained after the analog-to-digital conversion of conversion chip, the digital quantity signal of system voltage is delivered to FPGA and enters After row treatment, actual discrete instantaneous value signal Usa, Usb, the Usc of three-phase system voltage is obtained, calculated by zero passage detection The zero crossing and phase of three-phase system voltage

Current signal is gathered by output current transformer, the current signal of collection is by modulate circuit and AD conversion chip Analog-to-digital conversion after obtain the digital quantity signal of output current, the digital quantity signal of output current is delivered to FPGA treatment Afterwards, the actual discrete instantaneous value signal ia of three-phase output current is obtained_out、ib_out、ic_out；

D. c. voltage signal is gathered by DC voltage transformer, the d. c. voltage signal of collection is by modulate circuit and AD The digital quantity signal of DC voltage is obtained after the analog-to-digital conversion of conversion chip, the digital quantity signal of DC voltage is delivered to FPGA and enters After row treatment, the actual discrete instantaneous value signal of DC voltage is obtained, then the discrete instantaneous value actual to DC voltage Signal carries out the cumulative summation of power frequency time cycle and divided by the sampling number within a power frequency time cycle, obtains straight Stream voltage effective value U_DC；

Load current signal is gathered by load current transformer, load current signal is by modulate circuit and AD conversion core The digital quantity signal of load current is obtained after the analog-to-digital conversion of piece, the digital quantity signal of load current is delivered to FPGA treatment Afterwards, actual discrete instantaneous value signal ila, ilb, the ilc of threephase load electric current is obtained；

Step 2), by step 1) the actual discrete instantaneous value signal Usa of the three-phase system voltage that obtains, Usb, Usc, The zero crossing and phase of three-phase system voltageThe actual discrete instantaneous value signal ia of output current_out、ib_out、 ic_out, DC voltage effective value U_DCDiscrete instantaneous value signal ila, ilb, ilc actual with threephase load electric current calculates harmonic wave Compensation desired value after the superposition together of electric current, reactive current and negative phase-sequence watt current：ia_target、ib_target、ic_target；

Step 3) according to PWM pulse length modulation principles, it is assumed that the service time of each controlling cycle of three-phase IGBT is Ta_on、 Tb_on、Tc_on, the system simplified model according to loop voltage obtains system circuit voltage equation as follows：

I.e.：

Can obtain simultaneously：

Step 4), pass throughThe dutycycle of three-phase PWM ripple is calculated respectively, and PWM is with accounting for for calculating Sky is than being, according to generation trigger pulse sequence, to control insulated gate bipolar transistor IGBT conducting through IGBT drive circuit and close It is disconnected, so as to control inversion unit to export, reach compensation desired value.

Compensation desired value ia after the superposition together of described harmonic current, reactive current and negative phase-sequence watt current_target、 ib_target、ic_targetCalculating process it is as follows：

(1) positive sequence watt current IP is calculated_P, negative phase-sequence watt current IP_N, positive sequence active component IQ_P, negative phase-sequence reactive current IQ_N

(2) IP that will be obtained_P、IP_N、IQ_P、IQ_NLow-pass filtering treatment is carried out, retains its DC component, obtain positive sequence active Current dc component IP_Pd, negative phase-sequence watt current DC component IP_Nd, positive sequence active component DC component IQ_PdWith the idle electricity of negative phase-sequence Stream DC component IQ_Nd；

(3) threephase load current first harmonics component B_ila0, B_ilb0, B_ilc0 are calculated

In calculating process, remove IP_Nd、IQ_Pd、IQ_NdThe component of three is calculated, then can obtain isolating harmonic current, nothing The active fundametal compoment of positive sequence of work(electric current, negative phase-sequence watt current three-phase：

(3) by load current positive sequence active fundamental current B_ila, B_ilb, B_ilc and momentary load electric current ila, ilb, Ilc obtains containing harmonic current, reactive current, the compensation desired value of negative phase-sequence watt current superposition after subtracting each other：

ia_target=(B_ila)-ila

ib_target=(B_ilb)-ilb

ic_target=(B_ilc)-ilc.

Described step 3) in the system simplified model of loop voltage be：

It is at any time, each in loop along any loop direction of circling in circuit according to circuit loop voltage principle The algebraical sum perseverance of section voltage is zero, after simplifying to system, obtains the single-phase equivalent circuit of system, and loop-voltage equation is：

US-Ud+UL+UR=0

In formula：US is system phase voltage；

Wherein, Δ T：The control time cycle of the PWM under software set control frequency, Ta_on：Service time of the A phases within the control time cycle of PWM；

UL is the voltage at phase reactance two ends：Wherein, ia_targetFor A phases compensate mesh Scale value；ia_outIt is A phase reality output instantaneous values；The inductance value of three-phase output reactance is L；

UR is the partial pressure of system equivalent resistance, due to equivalent resistance very little, is ignored when calculating, and result of calculation is not It is accurate that influence is compensated.

Obtained after arranging equation：

As shown in figure 1, the described comprehensive electric energy quality controlling device based on loop voltage, including system power supply 9, system Power supply 9 connects three phase full bridge inversion unit 1 by output reactance device 2, the DC side connection concatenation of three phase full bridge inversion unit 1 Electric capacity C1 and electric capacity C2, electric capacity C1 and electric capacity C2 connect DC voltage transformer 8, the connection control system 3 of DC voltage transformer 8 DC voltage collection port.

Connection system voltage transformer 4 between described system power supply 9 and output reactance device 2, system voltage transformer 4 connects The system voltage collection port of connected control system 3, output current is installed between output reactance device 2 and three phase full bridge inversion unit 1 Transformer 6, the output current collection port of the connection control system 3 of output current transformer 6, three phase full bridge inversion unit 1 passes through Drive circuit 7 connects the PWM output ports of control system 3, and the load current collection port connection load current of control system 3 is mutual Sensor 5.

Described control system 3 DC voltage collection port, system voltage collection port, output current collection port and Load current collection port connects AD conversion chip by modulate circuit and sampled signal bus respectively, and AD conversion chip is by control Bus processed and data/address bus connection FPGA, FPGA connecting communication interface 485CAN and I/O port, the connection of PWM output ports FPGA, AD Conversion chip includes AD01, AD02 and AD03.

The present invention has elimination mains by harmonics, compensation system is idle, the function of balance three-phase load, not only comprehensive to solve Universal power quality problem existing for power network, also improves the quality of power supply of power network, has purified power network, optimizes electricity consumption ring Border, improves equipment operation and operation of power networks reliability.

The present invention is not limited in above-mentioned specific embodiment, and those of ordinary skill in the art are in essential scope of the invention Change, remodeling, addition or the replacement inside made, should also belong to protection scope of the present invention.

Claims (6)

1. a kind of control method of the comprehensive electric energy quality controlling device based on loop voltage, it is characterised in that：Including following step Suddenly：

Step 1), by system voltage transformer collection voltages signal, the voltage signal of collection is by modulate circuit and AD conversion The digital quantity signal of system voltage is obtained after the analog-to-digital conversion of chip, the digital quantity signal of system voltage is delivered at FPGA After reason, actual discrete instantaneous value signal Usa, Usb, the Usc of three-phase system voltage is obtained, three-phase is calculated by zero passage detection The zero crossing and phase of system voltage

Current signal is gathered by output current transformer, the current signal of collection is by modulate circuit and the mould of AD conversion chip Obtain the digital quantity signal of output current after number conversion, the digital quantity signal of output current is delivered to after FPGA processed, and is obtained To the actual discrete instantaneous value signal ia of three-phase output current_out、ib_out、ic_out；

D. c. voltage signal is gathered by DC voltage transformer, the d. c. voltage signal of collection is by modulate circuit and AD conversion The digital quantity signal of DC voltage is obtained after the analog-to-digital conversion of chip, the digital quantity signal of DC voltage is delivered at FPGA After reason, the actual discrete instantaneous value signal of DC voltage is obtained, then the discrete instantaneous value signal actual to DC voltage Carry out the cumulative summation of power frequency time cycle and divided by the sampling number within a power frequency time cycle, obtain direct current It is pressed with valid value U_DC；

Load current signal is gathered by load current transformer, load current signal is by modulate circuit and AD conversion chip Obtain the digital quantity signal of load current after analog-to-digital conversion, the digital quantity signal of load current is delivered to after FPGA processed, Obtain actual discrete instantaneous value signal ila, ilb, the ilc of threephase load electric current；

Step 2), by step 1) actual discrete instantaneous value signal Usa, Usb, Usc, the three-phase of the three-phase system voltage that obtains The zero crossing and phase of system voltageThe actual discrete instantaneous value signal ia of output current_out、ib_out、ic_out、 DC voltage effective value U_DCDiscrete instantaneous value signal ila, ilb, ilc actual with threephase load electric current calculate harmonic current, Compensation desired value after reactive current and the superposition together of negative phase-sequence watt current：ia_target、ib_target、ic_target；

Step 3) according to PWM pulse length modulation principles, it is assumed that the service time of each controlling cycle of three-phase IGBT is Ta_on、Tb_on、 Tc_on, the system simplified model according to loop voltage obtains system circuit voltage equation as follows：

$\frac{{\mathrm{Ta}}_{on}}{\mathrm{\Δ}T}\×U_{DC}=\frac{{\mathrm{ia}}_{t\arg et}-{\mathrm{ia}}_{out}}{\mathrm{\Δ}T}\×L+Usa+\frac{U_{DC}}{2}$

I.e.：

Can obtain simultaneously：

${\mathrm{Tb}}_{on}=\frac{({\mathrm{ib}}_{t\arg et}-{\mathrm{ib}}_{out})\×L+(Usb+\frac{U_{DC}}{2})\×\mathrm{\Δ}T}{U_{DC}}$

${\mathrm{Tc}}_{on}=\frac{({\mathrm{ic}}_{t\arg et}-{\mathrm{ic}}_{out})\×L+(Usc+\frac{U_{DC}}{2})\×\mathrm{\Δ}T}{U_{DC}};$

Step 4), pass throughThe dutycycle of three-phase PWM ripple, dutycycles of the PWM to calculate are calculated respectively It is, according to generation trigger pulse sequence, insulated gate bipolar transistor IGBT turn-on and turn-off to be controlled through IGBT drive circuit, from And control inversion unit to export, reach compensation desired value.

2. the control method of the comprehensive electric energy quality controlling device based on loop voltage according to claim 1, its feature It is：Compensation desired value ia after the superposition together of described harmonic current, reactive current and negative phase-sequence watt current_target、 ib_target、ic_targetCalculating process it is as follows：

(1) positive sequence watt current IP is calculated_P, negative phase-sequence watt current IP_N, positive sequence active component IQ_P, negative phase-sequence reactive current IQ_N

(2) IP that will be obtained_P、IP_N、IQ_P、IQ_NLow-pass filtering treatment is carried out, retains its DC component, obtain positive sequence watt current DC component IP_Pd, negative phase-sequence watt current DC component IP_Nd, positive sequence active component DC component IQ_PdIt is straight with negative phase-sequence reactive current Flow component IQ_Nd；

(3) threephase load current first harmonics component B_ila0, B_ilb0, B_ilc0 are calculated

In calculating process, remove IP_Nd、IQ_Pd、IQ_NdThe component of three is calculated, then can obtain isolating harmonic current, idle electricity Stream, the active fundametal compoment of positive sequence of negative phase-sequence watt current three-phase：

(3) by load current positive sequence active fundamental current B_ila, B_ilb, B_ilc and momentary load electric current ila, ilb, ilc phase Obtain containing harmonic current, reactive current, the compensation desired value of negative phase-sequence watt current superposition after subtracting：

ia_target=(B_ila)-ila

ib_target=(B_ilb)-ilb

ic_target=(B_ilc)-ilc.

3. the control method of the comprehensive electric energy quality controlling device based on loop voltage according to claim 1, its feature It is：Described step 3) in the system simplified model of loop voltage be：

According to circuit loop voltage principle, at any time, along any loop direction of circling in circuit, each section of electricity in loop The algebraical sum perseverance of pressure is zero, after simplifying to system, obtains the single-phase equivalent circuit of system, and loop-voltage equation is：

US-Ud+UL+UR=0

In formula：US is system phase voltage；

Wherein, Δ T：The control time cycle of the PWM under software set control frequency, Ta_on：A Service time within the control time cycle of PWM；

UL is the voltage at phase reactance two ends：Wherein, ia_targetFor A phases compensate target Value；ia_outIt is A phase reality output instantaneous values；The inductance value of three-phase output reactance is L；

UR is the partial pressure of system equivalent resistance, due to equivalent resistance very little, is ignored when calculating, and result of calculation does not influence What is compensated is accurate；

Obtained after arranging equation：

$\frac{{\mathrm{Ta}}_{on}}{\mathrm{\Δ}T}\×U_{DC}=\frac{{\mathrm{ia}}_{t\arg et}-{\mathrm{ia}}_{out}}{\mathrm{\Δ}T}\×L+Usa+\frac{U_{DC}}{2}.$

4. the comprehensive electric energy quality controlling device based on loop voltage of the control method described in a kind of use claim 1, its It is characterised by：Including system power supply (9), system power supply (9) connects three phase full bridge inversion unit (1) by output reactance device (2), The electric capacity C1 and electric capacity C2 of the DC side connection concatenation of three phase full bridge inversion unit (1), electric capacity C1 and electric capacity C2 connection direct currents Pressure transformer (8), the DC voltage collection port of DC voltage transformer (8) connection control system (3)；

Connection system voltage transformer (4), system voltage transformer between described system power supply (9) and output reactance device (2) (4) the system voltage collection port of connection control system (3), wears between output reactance device (2) and three phase full bridge inversion unit (1) There is output current transformer (6), the output current collection port of output current transformer (6) connection control system (3), three-phase is complete Bridge inversion unit (1) connects the PWM output ports of control system (3), the load electricity of control system (3) by drive circuit (7) Stream collection port connects load current transformer (5).

5. the comprehensive electric energy quality controlling device based on loop voltage according to claim 4, it is characterised in that：Described The DC voltage collection port of control system (3), system voltage collection port, output current gather port and load current collection Port connects AD conversion chip by modulate circuit and sampled signal bus respectively, and AD conversion chip passes through controlling bus and data Bus connects FPGA, FPGA connecting communication interface 485CAN and I/O port, PWM output ports connection FPGA.

6. the comprehensive electric energy quality controlling device based on loop voltage according to claim 4, it is characterised in that：Described AD conversion chip includes AD01, AD02 and AD03.