CN109494815B - Multi-target coordination control method of distributed power flow controller - Google Patents

Multi-target coordination control method of distributed power flow controller Download PDF

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CN109494815B
CN109494815B CN201811570354.4A CN201811570354A CN109494815B CN 109494815 B CN109494815 B CN 109494815B CN 201811570354 A CN201811570354 A CN 201811570354A CN 109494815 B CN109494815 B CN 109494815B
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power flow
flow controller
line
distributed power
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CN109494815A (en
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徐秋实
黄涌
郑旭
唐爱红
杜治
赵红生
乔立
王巧鸽
张述元
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State Grid Corp of China SGCC
Wuhan University of Technology WUT
Economic and Technological Research Institute of State Grid Hubei Electric Power Co Ltd
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Wuhan University of Technology WUT
Economic and Technological Research Institute of State Grid Hubei Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

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Abstract

A multi-target coordination control method of a distributed power flow controller comprises the steps of firstly establishing a distributed power flow controller multi-target coordination control model which takes line active power flow, line reactive power flow, line head end bus voltage, series side direct current capacitor voltage and direct current capacitor voltage between two converters on the parallel side as control variables, takes the integral of the variance of the control variables and corresponding controller set reference values as performance indexes to form a target function, then inputting parameters of all elements on a line into the distributed power flow controller multi-target coordination control model to obtain control parameters of the distributed power flow controller, and then carrying out coordination control on the distributed power flow controller according to the control parameters. The design obviously improves the performance of the distributed power flow controller.

Description

Multi-target coordination control method of distributed power flow controller
Technical Field
The invention belongs to the technical field of intelligent power grid operation and stability control, and particularly relates to a multi-target coordination control method of a distributed power flow controller, which aims to improve the working efficiency of the distributed power flow controller.
Background
The Distributed Power Flow Controller (DPFC) has the functions of Power regulation, voltage regulation, Power oscillation suppression of the Power system, and stability enhancement of the Power system, and also has the characteristics of imbalance compensation, Power quality control, and the like. The DPFC parallel side three-phase converter exchanges fundamental wave power with a system through a transformer, wherein active power is used for maintaining the voltage of a direct current capacitor at a target value, and reactive power is used for controlling the voltage of a parallel side bus. The single-phase converter transmits third harmonic power to the DPFC series side through a transmission line, and on one hand, the series side converter absorbs the third harmonic active power transmitted by the parallel side converter through the transmission line from a system and is used for maintaining the direct current capacitor voltage of the converter as a target value; on the other hand, according to the requirement of system power flow regulation, fundamental voltage with adjustable amplitude and phase angle is injected into the system, and the serial-parallel side coordination effect is realized to jointly realize the function of regulating the power flow of the DPFC system.
Three-phase and single-phase converters are arranged on the parallel side of the distributed power flow controller, and up to hundreds of single-phase converters are arranged on the serial side of the distributed power flow controller, and the mutual coupling effect of the three-phase and single-phase converters is very complicated. In addition, the DPFC has a plurality of control targets in the aspect of tidal control, seeks coordination control among multiple targets, and is one of important problems to be solved by the DPFC which is powerful in function and low in cost and is applied to engineering.
Disclosure of Invention
Based on the above background, the invention provides a multi-target coordination control method for a distributed power flow controller, which can effectively improve the performance of the distributed power flow controller.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a multi-target coordination control method of a distributed power flow controller sequentially comprises the following steps:
step A, establishing a distributed power flow controller multi-target coordination control model, wherein the target function of the distributed power flow controller multi-target coordination control model is as follows:
Figure BDA0001915357540000011
in the above formula, D (δ)se) Is deltaseThe controller corresponding thereto sets the variance, delta, of the reference valueseFor line active power flow, VseFor line reactive power flow, VsFor line head bus voltage, Vdc，seIs a series side DC capacitor voltage, Vdc，shThe direct current capacitor voltage between the two converters on the parallel side is obtained, and t is time;
and step B, firstly, inputting parameter values of all elements on the line into the multi-target coordinated control model of the distributed power flow controller to obtain control parameters of the distributed power flow controller, and then carrying out coordinated control on the distributed power flow controller according to the control parameters.
In the step A, the step B is carried out,
Figure BDA0001915357540000021
Figure BDA0001915357540000022
Figure BDA0001915357540000023
in the above formula, Kpk、KikRespectively, the proportional coefficient and the integral coefficient of the distributed power flow controller, k is 1,2,3, 4, 5, and s is VsePhase angle of (P)L、QLActive and reactive power flows, P, respectively, of the controlled lineL，ref、QL，refReference values, m, for active and reactive power flows of the controlled line, respectivelyshIs the modulation ratio, V, of two converters on the parallel sides，refIs a VsReference value of (I)sh1，d、Ish1，d，refD-axis components, I, of the parallel-side fundamental wave current and its reference value, respectivelysh3、Ish1，d，refRespectively the third harmonic current and its reference value sent out to the line by the parallel side converter.
In the step A, the constraint conditions of the objective function comprise energy balance constraint, voltage safety operation limit constraint and device output limit constraint;
the energy balance constraint is:
Figure BDA0001915357540000024
in the above formula, PseInjecting line active power, P, for a series-side convertershActive power absorbed by the parallel-side converter, P1For active power at the head end of the line, Pse1Fundamental power, P, injected into the line for the series-side converterdc，se、Pdc，shActive power on series-parallel side DC capacitors, Psh3The third harmonic active power is emitted to the circuit by the parallel side converter;
the voltage safety operating limit constraints are:
Figure BDA0001915357540000031
Figure BDA0001915357540000032
Figure BDA0001915357540000033
in the above formula, Vsmin、VsmaxIs a VsMinimum and maximum safe operating values of VsemaxIs a VseMaximum allowed, mse1Is the modulation ratio, V, of the series-side converterdc，se，maxIs the maximum value of the dc capacitor voltage,
Figure BDA0001915357540000034
the maximum value of the third harmonic voltage sent to the circuit by the series-side converter is shown, and xi is the maximum deviation value allowed by the safe operation of the circuit;
the device output limit constraints are:
Figure BDA0001915357540000035
Psemax+Qsemax＝Sse
in the above formula, Pse、QseActive and reactive power, P, respectively, of the injection line on the series sidesemax、QsmaxRespectively the active power maximum and the reactive power maximum, S, of the injection line on the series sideseThe capacity of the device on the serial side.
In the step B, the control parameters comprise a proportional coefficient and an integral coefficient of the distributed power flow controller.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a multi-target coordination control method of a distributed power flow controller, which takes a line active power flow, a line reactive power flow, a line head end bus voltage, a series side direct current capacitor voltage and a direct current capacitor voltage between two converters on a parallel side as control variables, takes the integral of the variance of the control variables and the corresponding controller set reference values as performance indexes to form a target function, and takes the multi-constraint conditions of energy balance constraint, voltage safety operation limit constraint, device output limit constraint and the like into consideration to construct a multi-target coordination control model of the distributed power flow controller. Therefore, the invention improves the performance of the distributed power flow controller obviously.
Drawings
Fig. 1 is a schematic diagram of a DPFC power flow regulation capability in embodiment 1 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
A multi-target coordination control method of a distributed power flow controller sequentially comprises the following steps:
step A, establishing a distributed power flow controller multi-target coordination control model, wherein the target function of the distributed power flow controller multi-target coordination control model is as follows:
Figure BDA0001915357540000041
in the above formula, D (δ)se) Is deltaseThe controller corresponding thereto sets the variance, delta, of the reference valueseFor line active power flow, VseFor line reactive power flow, VsFor line head bus voltage, Vdc，seIs a series side DC capacitor voltage, Vdc，shThe direct current capacitor voltage between the two converters on the parallel side is obtained, and t is time;
and step B, firstly, inputting parameter values of all elements on the line into the multi-target coordinated control model of the distributed power flow controller to obtain control parameters of the distributed power flow controller, and then carrying out coordinated control on the distributed power flow controller according to the control parameters.
In the step A, the step B is carried out,
Figure BDA0001915357540000042
Figure BDA0001915357540000043
Figure BDA0001915357540000044
in the above formula, Kpk、KikRespectively, the proportional coefficient and the integral coefficient of the distributed power flow controller, k is 1,2,3, 4, 5, and s is VsePhase angle of (P)L、QLActive and reactive power flows, P, respectively, of the controlled lineL，ref、QL，refReference values, m, for active and reactive power flows of the controlled line, respectivelyshIs the modulation ratio, V, of two converters on the parallel sides，refIs a VsReference value of (I)sh1，d、Ish1，d，refD-axis components, I, of the parallel-side fundamental wave current and its reference value, respectivelysh3、Ish3，refRespectively the third harmonic current and its reference value sent out to the line by the parallel side converter.
In the step A, the constraint conditions of the objective function comprise energy balance constraint, voltage safety operation limit constraint and device output limit constraint;
the energy balance constraint is:
Figure BDA0001915357540000051
in the above formula, PseInjecting line active power, P, for a series-side convertershActive power absorbed by the parallel-side converter, P1For the active power at the head end of the line,Pse1fundamental power, P, injected into the line for the series-side converterdc，se、Pdc，shActive power on series-parallel side DC capacitors, Psh3The third harmonic active power is emitted to the circuit by the parallel side converter;
the voltage safety operating limit constraints are:
Figure BDA0001915357540000052
Figure BDA0001915357540000053
Figure BDA0001915357540000054
in the above formula, Vsmin、VsmaxIs a VsMinimum and maximum safe operating values of VsemaxIs a VseMaximum allowed, mse1Is the modulation ratio, V, of the series-side converterdc，se，maxIs the maximum value of the dc capacitor voltage,
Figure BDA0001915357540000055
the maximum value of the third harmonic voltage sent to the circuit by the series-side converter is shown, and xi is the maximum deviation value allowed by the safe operation of the circuit;
the device output limit constraints are:
Figure BDA0001915357540000056
Psemax+Qsemax＝Sse
in the above formula, Pse、QseActive and reactive power, P, respectively, of the injection line on the series sidesemax、QsemaxActive power maximum and reactive power of the series side injection line respectivelyMaximum value, SseThe capacity of the device on the serial side.
In the step B, the control parameters comprise a proportional coefficient and an integral coefficient of the distributed power flow controller.
Example 1:
the present embodiment is directed to a single infinite system equipped with two sets of series-side distributed power flow controllers, and the single infinite system includes two-end generators G1 and G2, buses B1 and B2, and two-circuit power transmission lines L1 and L2, where the ratio of transformers on two sides is Δ -Y and Y- Δ connection, and parameters of each element on the lines are: the power voltage of the power generation end is 0.38kV, the voltage phase angle is 8.7 degrees, the internal resistance is 1 omega, and the inductance is 0.1H; the power supply voltage of the receiving end is 0.38kV, and the voltage phase angle is 0 degree; the impedance of the two lines is 0.279+ j3.99 omega, and the transformation ratio of the transformer is 1: 1; the tail end of the line is connected with a resistor with the resistance of 0.5 omega; the voltage values of the series-parallel direct current capacitors are all 200V; the parallel side of the distributed power flow controller is arranged on a neutral line of a generator and a transformer T1, two groups of series current transformers are arranged on a line L1, and the electrical distance is equal, namely the resistance between the two series current transformers is 0.1395+ j1.995 omega, and the resistance accounts for half of the total impedance of the line.
A multi-target coordination control method of a distributed power flow controller is sequentially carried out according to the following steps:
step 1, establishing a distributed power flow controller multi-target coordination control model, wherein the target function of the distributed power flow controller multi-target coordination control model is as follows:
Figure BDA0001915357540000061
Figure BDA0001915357540000062
Figure BDA0001915357540000063
Figure BDA0001915357540000064
Figure BDA0001915357540000065
Figure BDA0001915357540000066
Figure BDA0001915357540000067
Figure BDA0001915357540000068
Figure BDA0001915357540000069
Psemax+Qsemax＝Sse
in the above formula, D (δ)se) Is deltaseThe controller corresponding thereto sets the variance, delta, of the reference valueseFor line active power flow, VseFor line reactive power flow, VsFor line head bus voltage, Vdc，seIs a series side DC capacitor voltage, Vdc，shIs the DC capacitor voltage between two converters on the parallel side, t is the time, Kpk、KikRespectively, the proportional coefficient and the integral coefficient of the distributed power flow controller, k is 1,2,3, 4, 5, and s is VsePhase angle of (P)L、QLActive and reactive power flows, P, respectively, of the controlled lineL，ref、QL，refReference values, m, for active and reactive power flows of the controlled line, respectivelyshIs the modulation ratio, V, of two converters on the parallel sides，refIs a VsReference value of (I)sh1，d、Ish1，d，refRespectively, parallel side group wave current and its referenceD-axis component of value, Ish3、Ish3，refRespectively the third harmonic current and its reference value, P, emitted to the line by the parallel-side converterseInjecting line active power, P, for a series-side convertershActive power absorbed by the parallel-side converter, P1For active power at the head end of the line, Pse1Fundamental power, P, injected into the line for the series-side converterdc，se、Pdc，shActive power on series-parallel side DC capacitors, Psh3Third harmonic active power, V, emitted to the line for the parallel-side converters min、Vs maxIs a VsMinimum and maximum safe operating values of VsemaxIs a VseMaximum allowed, mse1Is the modulation ratio, V, of the series-side converterdc，se，maxIs the maximum value of the dc capacitor voltage,
Figure BDA0001915357540000071
the maximum value of the third harmonic voltage sent to the circuit by the series-side converter, xi is the maximum deviation value allowed by the safe operation of the circuit, Pse、QseActive and reactive power, P, respectively, of the injection line on the series sidesemax、QsemaxRespectively the active power maximum and the reactive power maximum, S, of the injection line on the series sideseDevice capacity on the serial side;
step 2, inputting parameter values of all elements on the line into the multi-target coordinated control model of the distributed power flow controller to obtain VseThe range between the power flow regulation and control capabilities of the line (see fig. 1, different ellipses in the figure represent the power flow regulation and control capabilities of the DPFC corresponding to series side-group wave voltages under different amplitudes, the corresponding center D (0.376, 0.131) of the same ellipse is the original power flow value of the system, and the final regulation and control capability is an area in a sector area of A, B, O enclosed city because of the constraint of the direct-current capacitor voltage, the selected cross probability is 0.8, the variation probability is 0.07, the population scale is 50, the maximum optimization algebra is 50, and the control parameters of the distributed power flow controller are obtained by considering the constraint of the ABO sector area shown in fig. 1: coefficient of proportionality Kp1＝0.82、Kp2＝0.45、Kp3＝0.62、Kp4＝0.65、Kp50.56; integral coefficient: ki1＝0.06、Ki2＝0.03、Ki3＝0.05、Ki4＝0.05、Ki5＝0.04；
Step 3, inputting the control parameters, starting the distributed power flow controller (but only putting the first group on the serial side) when 4s is obtained, and setting the active power flow of the line to be stepped from the initial power flow to 1 kW; when 8s, a second group of converters on the series side are put into use, and the active power flow of the line is set to be stepped from 1kW to 1.47 kW; the two sets of series-side converter dc capacitor voltages were set constant at 100V. When the simulation comparison controller before and after the optimization of the control parameters is not optimized, the direct current capacitor voltage of the first group of series converters jumps from 0.5V to 1.8V in 8s, and the voltage fluctuation amplitude is 89%; the direct-current capacitor voltage of the two groups of series converters can be maintained at about 0.2V, the voltage fluctuation is reduced, and then the direct-current capacitor voltage is input to the series side of the second group of distributed power flow controllers, so that the injection voltage of the first group of series converters drops by about 5V; at this time, when the second group is put into use, the voltage fluctuation of the first group of series converters is only 0.5V, and the injection voltages of the two series converters tend to be in a steady state more quickly than before optimization.
Therefore, the control model can optimize each controller, and the performance of the distributed power flow controller can be improved better.

Claims (2)

1. A multi-target coordination control method of a distributed power flow controller is characterized by comprising the following steps:
the coordination control method sequentially comprises the following steps:
step A, establishing a distributed power flow controller multi-target coordination control model, wherein the target function of the distributed power flow controller multi-target coordination control model is as follows:
Figure FDA0003326171400000011
Figure FDA0003326171400000012
Figure FDA0003326171400000013
Figure FDA0003326171400000014
in the above formula, D (δ)se) Is deltaseThe controller corresponding thereto sets the variance, delta, of the reference valueseFor line active power flow, VseFor line reactive power flow, VsFor line head bus voltage, Vdc，seIs a series side DC capacitor voltage, Vdc，shIs the DC capacitor voltage between two converters on the parallel side, t is the time, Kpk、KikRespectively, the proportional coefficient and the integral coefficient of the distributed power flow controller, k is 1,2,3, 4, 5, and s is VsePhase angle of (Q)L、QLActive and reactive power flows, P, respectively, of the controlled lineL，ref、QL，refReference values, m, for active and reactive power flows of the controlled line, respectivelyshIs the modulation ratio, V, of two converters on the parallel sides，refIs a VsReference value of (I)sh1，d、Ish1，d，refD-axis components, I, of the parallel-side fundamental wave current and its reference value, respectivelysh3、Ish3，refThe three harmonic currents and the reference values thereof are respectively sent to the circuit by the parallel side converter;
the constraint conditions of the objective function comprise energy balance constraint, voltage safety operation limit constraint and device output limit constraint;
the energy balance constraint is:
Figure FDA0003326171400000021
in the above formula, PseInjecting line active power, P, for a series-side convertershActive power absorbed by the parallel-side converter, P1For active power at the head end of the line, Pse1Fundamental power, P, injected into the line for the series-side converterdc，se、Pdc，shActive power on series-parallel side DC capacitors, Psh3The third harmonic active power is emitted to the circuit by the parallel side converter;
the voltage safety operating limit constraints are:
Figure FDA0003326171400000022
Figure FDA0003326171400000023
Figure FDA0003326171400000024
in the above formula, Vs min、Vs maxIs a VsMinimum and maximum safe operating values of VsemaxIs a VseMaximum allowed, mse1Is the modulation ratio, V, of the series-side converterdc，se，maxIs the maximum value of the dc capacitor voltage,
Figure FDA0003326171400000025
the maximum value of the third harmonic voltage sent to the circuit by the series-side converter is shown, and xi is the maximum deviation value allowed by the safe operation of the circuit;
the device output limit constraints are:
Figure FDA0003326171400000026
Psemax+Qsemax＝Sse
in the above formula, Pse、QseActive and reactive power, P, respectively, of the injection line on the series sidesemax、QsemaxRespectively the active power maximum and the reactive power maximum, S, of the injection line on the series sideseDevice capacity on the serial side;
and step B, firstly, inputting parameter values of all elements on the line into the multi-target coordinated control model of the distributed power flow controller to obtain control parameters of the distributed power flow controller, and then carrying out coordinated control on the distributed power flow controller according to the control parameters.
2. The multi-target coordination control method of the distributed power flow controller according to claim 1, characterized in that:
in the step B, the control parameters comprise a proportional coefficient and an integral coefficient of the distributed power flow controller.
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