CN112736928B - Method and system for constant value conversion of power flow control mode of distributed power flow controller - Google Patents
Method and system for constant value conversion of power flow control mode of distributed power flow controller Download PDFInfo
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
Abstract
The invention discloses a method and a system for constant value conversion of a power flow control mode of a distributed power flow controller. Currently, distributed power flow controllers press tidesWhen the flow control mode is used for control, the impedance is obtained through actually measuring the output voltage of the DPFC and the line current, but the mode cannot carry out the prior full-network power flow analysis and only can carry out the real-time power flow analysis. The invention firstly carries out the constant value P of the current controlrefCorresponding to the power flow P when the output voltage of DPFC is maximummaxThen the power flow control constant value P is setrefPower flow P less than the maximum corresponding DPFC output voltagemaxAnd under the condition of (1), calculating the tidal current values of the previous time and the next time, and finally judging to obtain the impedance fixed value by using the absolute value of the tidal current difference ratio and the deviation allowable value. The invention converts the power flow control constant value into the impedance constant value, so that the power flow control mode obtains the impedance data through simple calculation and is suitable for developing the prior whole network power flow analysis.
Description
Technical Field
The invention belongs to the field of distributed power flow controllers, and particularly relates to a power flow control mode fixed value conversion method and system of a distributed power flow controller.
Background
DPFC distributed power flow controller, a power electronic device for changing the power flow of a line by changing the impedance of a series-connected line, and the topological structure of the power electronic device is shown in figure 1.
Fast bypass switch (BPS): the high-speed mechanical bypass switch is formed by connecting a high-speed mechanical bypass switch (K) and an anti-parallel Thyristor (TBS) in parallel, the high-speed mechanical bypass switch is closed when the circuit does not need to carry out power flow control (small power flow) or a module has a fault, the bypass of the module is realized, and the high-speed mechanical bypass switch is opened when the circuit needs to carry out power flow control to connect a converter in series into the circuit.
Voltage Source Converter (VSC): the VSC module is gated by the function gating switch, the DSSC device of the distributed static series compensator is connected into the system, and the voltage source converter VSC works in a reactive output state to enable the voltage source converter VSC to present inductance/capacitance characteristics and change the impedance of a line, so that the line is adjusted in a transmission active mode. Line flow may be increased when compensation is capacitive and decreased when compensation is inductive.
The control energy taking unit: the energy taking of the control and communication system is realized through the line current energy taking and the module capacitor voltage self energy taking.
The control energy-taking unit generally comprises three control modes.
1. Injection voltage mode: controlling the DPFC to output the AC voltage amplitude to a preset value Uref。
2. And a tide control mode: the active power of the circuit mounted with the DPFC for circulation is controlled to be a preset value P by adjusting the output alternating voltage of the DPFCref。
3. Impedance control mode: the amplitude of the alternating voltage output by the DPFC is adjusted to enable the impedance of a series circuit to be a preset value Zref。
At present, in the actual operation process of a power grid, when the DPFC is controlled according to a power flow control mode, impedance is obtained through actually measuring output voltage and line current of the DPFC, but the mode can not carry out the prior power flow analysis of the whole power grid, and only can carry out the real-time power flow analysis of the power grid.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method and a system for converting a fixed value of a power flow control mode of a distributed power flow controller, wherein the method and the system utilize a power flow control fixed value P to control a fixed valuerefConversion to a constant value of impedance ZrefThe power flow control mode obtains impedance data through simple calculation so as to be suitable for developing the prior whole-network power flow analysis.
The invention adopts a technical scheme as follows: a power flow control mode constant value conversion method of a distributed power flow controller utilizes a power flow control constant value PrefConversion to a constant value of impedance ZrefThe method comprises the following steps:
1) comparing power flow control constant value PrefCorresponding to the power flow P when the output voltage of DPFC is maximummaxIf P is the size ofref≥PmaxThen, the mode is switched to an injection voltage mode, and the voltage of injection is controlled to be constant value UrefEqual to the maximum value of voltage UmaxAnd calculating a corresponding impedance constant value Zref(ii) a If Pref＜PmaxEntering the next step;
2) calculating voltage control constant value Uref=U1=UmaxFirst impedance Z corresponding to/21，U1Is a first iteration voltage;
3) setting the iteration number n = 2;
4) in-line second impedance Zn-1And when other power grid parameters are unchanged, calculating by electromechanical transient analysis software to obtain the current line tide current value Pn-1；
5) Comparison Pn-1、PrefAnd PmaxIf P isn-1≤Pref<PmaxThen U isn=（Umax-Un-1) If P is 2ref＜Pn-1Then U isn=Un-1/2，UnIs the nth iteration voltage;
6) calculate Uref=UnCorresponding third impedance Zn；
7) In-line third impedance ZnAnd when other power grid parameters are unchanged, calculating by electromechanical transient analysis software to obtain the current line tide current value Pn；
8) Calculating the absolute value dP of the load flow difference rationIn which dP isn=︱(Pn-Pn-1)/Pn｜；
9) Determination of dPnAnd is inclined toThe magnitude between the allowed values of the difference δ, if dPn<δ, then the calculation is finished, ZrefIs ZnIf dP isnAnd if the iteration number n = n +1, returning to the step 4 to continue the calculation.
Further, in step 1), the impedance value Z is fixedrefIs calculated as follows: according to the power grid parameters, calculating by electromechanical transient analysis software to obtain the line current I without DPFC1，Zref=Uref/I1=Umax/I1。
Further, in step 2), the first impedance Z1Is calculated as follows: according to the power grid parameters, calculating by electromechanical transient analysis software to obtain the line current I without DPFC1，Z1=Uref/I1=Umax/2I1。
Further, in step 6), the third impedance ZnIs calculated as follows: one size is equal to Zn-1The impedance of the transformer is connected into the line in series, and new line current I is obtained through electromechanical transient analysis software calculation according to new power grid parametersn，Zn=Un/In。
Further, in step 9), the allowable deviation value δ is set according to the maximum allowable deviation of the power flow.
Further, the deviation allowance value delta is 0.5 to 1.5%, and most preferably 1%.
The other technical scheme adopted by the invention is as follows: a distributed power flow controller voltage control mode constant value conversion system which utilizes a power flow control constant value PrefConversion to a constant value of impedance ZrefWhich comprises the following steps:
a first comparison unit for comparing the power flow control constant value PrefCorresponding to the power flow P when the output voltage of DPFC is maximummaxIf P is the size ofref≥PmaxThen, the mode is switched to an injection voltage mode, and the voltage of injection is controlled to be constant value UrefEqual to the maximum value of voltage UmaxAnd calculating a corresponding impedance constant value Zref(ii) a If Pref＜PmaxEntering the next step;
first impedance calculation sheetCalculating voltage control constant value Uref=U1=UmaxFirst impedance Z corresponding to/21，U1Is a first iteration voltage;
an iteration number setting unit which sets an iteration number n = 2;
a first line load flow calculation unit for serially connecting a second impedance Z into the linen-1And when other power grid parameters are unchanged, calculating by electromechanical transient analysis software to obtain the current line tide current value Pn-1；
Second comparison unit, comparison Pn-1、PrefAnd PmaxIf P isn-1≤Pref<PmaxThen U isn=（Umax-Un-1) If P is 2ref＜Pn-1Then U isn=Un-1/2，UnIs the nth iteration voltage;
a third impedance calculating unit for calculating Uref=UnCorresponding third impedance Zn；
A second line load flow calculation unit for serially connecting a third impedance ZnAnd when other power grid parameters are unchanged, calculating by electromechanical transient analysis software to obtain the current line tide current value Pn；
A power flow difference ratio absolute value calculating unit for calculating the power flow difference ratio absolute value dPnIn which dP isn=︱(Pn-Pn-1)/Pn｜；
A determination unit for determining dPnFrom the deviation allowance delta if dPn<δ, then the calculation is finished, ZrefIs ZnIf dP isnAnd if the iteration number n = n +1, returning to the first line load flow calculation unit for continuous calculation.
Further, in the first comparison unit, the impedance value Z is fixedrefIs calculated as follows: according to the power grid parameters, calculating by electromechanical transient analysis software to obtain the line current I without DPFC1，Zref=Uref/I1=Umax/I1；
In the first impedance calculating unit, a first impedance Z1Meter (2)The calculation is as follows: according to the power grid parameters, calculating by electromechanical transient analysis software to obtain the line current I without DPFC1，Z1=Uref/I1=Umax/2I1；
In the third impedance calculating unit, the third impedance ZnIs calculated as follows: one size is equal to Zn-1The impedance of the transformer is connected into the line in series, and new line current I is obtained through electromechanical transient analysis software calculation according to new power grid parametersn，Zn=Un/In。
Further, the allowable deviation value δ is set according to the maximum allowable deviation of the impedance, and is 0.5-1.5%, and most preferably 1%.
The invention has the following beneficial effects: the invention utilizes the power flow to control the constant value PrefConversion to a constant value of impedance ZrefThe power flow control mode obtains impedance data through simple calculation, and is suitable for developing the prior whole network power flow analysis.
Drawings
Fig. 1 is a topology structure diagram of a main circuit of a conventional DPFC subunit;
fig. 2 is a flowchart of a fixed value conversion method of a power flow control mode of a distributed power flow controller according to the present invention;
fig. 3 is a structural diagram of a power flow control mode fixed value conversion system of a distributed power flow controller according to the present invention.
Detailed Description
The technology of the present invention will be described in detail below with reference to specific embodiments. It should be understood that the following detailed description is only for the purpose of assisting those skilled in the art in understanding the present invention, and is not intended to limit the present invention.
Example 1
Fig. 2 shows a method for scaling a power flow control mode constant value of a distributed power flow controller, which uses a power flow control constant value PrefConversion to a constant value of impedance ZrefThe method comprises the following steps:
1) comparing power flow control constant value PrefCorresponding to the power flow P when the output voltage of DPFC is maximummaxIf P is the size ofref≥PmaxThen, the mode is switched to an injection voltage mode, and the voltage of injection is controlled to be constant value UrefEqual to the maximum value of voltage UmaxAnd calculating a corresponding impedance constant value Zref(ii) a If Pref＜PmaxEntering the next step;
2) calculating voltage control constant value Uref=U1=UmaxFirst impedance Z corresponding to/21，U1Is a first iteration voltage;
3) setting the iteration number n = 2;
4) in-line second impedance Zn-1And when other power grid parameters are unchanged, calculating by electromechanical transient analysis software to obtain the current line tide current value Pn-1；
5) Comparison Pn-1、PrefAnd PmaxIf P isn-1≤Pref<PmaxThen U isn=（Umax-Un-1) If P is 2ref＜Pn-1Then U isn=Un-1/2，UnIs the nth iteration voltage;
6) calculate Uref=UnCorresponding third impedance Zn；
7) In-line third impedance ZnAnd when other power grid parameters are unchanged, calculating by electromechanical transient analysis software to obtain the current line tide current value Pn；
8) Calculating the absolute value dP of the load flow difference rationIn which dP isn=︱(Pn-Pn-1)/Pn｜；
9) Determination of dPnFrom the deviation allowance delta if dPn<δ, then the calculation is finished, ZrefIs ZnIf dP isnAnd if the iteration number n = n +1, returning to the step 4 to continue the calculation.
In step 1), the impedance value Z is fixedrefIs calculated as follows: according to the power grid parameters, calculating by electromechanical transient analysis software to obtain the line current I without DPFC1，Zref=Uref/I1=Umax/I1。
In step 2), the first impedance Z1Is calculated as follows: according to the power grid parameters, calculating by electromechanical transient analysis software to obtain the line current I without DPFC1，Z1=Uref/I1=Umax/2I1。
In step 6), the third impedance ZnIs calculated as follows: one size is equal to Zn-1The impedance of the transformer is connected into the line in series, and new line current I is obtained through electromechanical transient analysis software calculation according to new power grid parametersn，Zn=Un/In。
In step 9), the allowable deviation value delta is set according to the maximum allowable deviation of the power flow, and is 1%.
Example 2
A distributed power flow controller voltage control mode constant value conversion system as shown in FIG. 3, which utilizes power flow control constant value PrefConversion to a constant value of impedance ZrefWhich comprises the following steps:
a first comparison unit for comparing the power flow control constant value PrefCorresponding to the power flow P when the output voltage of DPFC is maximummaxIf P is the size ofref≥PmaxThen, the mode is switched to an injection voltage mode, and the voltage of injection is controlled to be constant value UrefEqual to the maximum value of voltage UmaxAnd calculating a corresponding impedance constant value Zref(ii) a If Pref＜PmaxEntering the next step;
a first impedance calculating unit for calculating a voltage control constant value Uref=U1=UmaxFirst impedance Z corresponding to/21，U1Is a first iteration voltage;
an iteration number setting unit which sets an iteration number n = 2;
a first line load flow calculation unit for serially connecting a second impedance Z into the linen-1And when other power grid parameters are unchanged, calculating by electromechanical transient analysis software to obtain the current line tide current value Pn-1；
Second comparison unit, comparison Pn-1、PrefAnd PmaxIf P isn-1≤Pref<PmaxThen U isn=（Umax-Un-1) If P is 2ref＜Pn-1Then U isn=Un-1/2，UnIs the nth iteration voltage;
a third impedance calculating unit for calculating Uref=UnCorresponding third impedance Zn；
A second line load flow calculation unit for serially connecting a third impedance ZnAnd when other power grid parameters are unchanged, calculating by electromechanical transient analysis software to obtain the current line tide current value Pn；
A power flow difference ratio absolute value calculating unit for calculating the power flow difference ratio absolute value dPnIn which dP isn=︱(Pn-Pn-1)/Pn｜；
A determination unit for determining dPnFrom the deviation allowance delta if dPn<δ, then the calculation is finished, ZrefIs ZnIf dP isnAnd if the iteration number n = n +1, returning to the first line load flow calculation unit for continuous calculation.
In the first comparison unit, the impedance value ZrefIs calculated as follows: according to the power grid parameters, calculating by electromechanical transient analysis software to obtain the line current I without DPFC1，Zref=Uref/I1=Umax/I1。
In the first impedance calculating unit, a first impedance Z1Is calculated as follows: according to the power grid parameters, calculating by electromechanical transient analysis software to obtain the line current I without DPFC1，Z1=Uref/I1=Umax/2I1。
In the third impedance calculating unit, the third impedance ZnIs calculated as follows: one size is equal to Zn-1The impedance of the transformer is connected into the line in series, and new line current I is obtained through electromechanical transient analysis software calculation according to new power grid parametersn，Zn=Un/In。
The allowable deviation value delta is set according to the maximum allowable deviation of the impedance, and is generally 1%.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. The method for constant value conversion of the power flow control mode of the distributed power flow controller is characterized in that a constant value P of power flow control is convertedrefConversion to a constant value of impedance ZrefThe method comprises the following steps:
1) comparing power flow control constant value PrefCorresponding to the power flow P when the output voltage of DPFC is maximummaxIf P is the size ofref≥PmaxThen, the mode is switched to an injection voltage mode, and the voltage of injection is controlled to be constant value UrefEqual to the maximum value of voltage UmaxAnd calculating a corresponding impedance constant value Zref(ii) a If Pref＜PmaxEntering the next step;
2) calculating voltage control constant value Uref=U1=UmaxFirst impedance Z corresponding to/21，U1Is a first iteration voltage;
3) setting the iteration number n = 2;
4) in-line second impedance Zn-1And when other power grid parameters are unchanged, calculating by electromechanical transient analysis software to obtain the current line tide current value Pn-1；
5) Comparison Pn-1、PrefAnd PmaxIf P isn-1≤Pref<PmaxThen U isn=（Umax-Un-1）/2；
If Pref＜Pn-1Then U isn=Un-1/2，UnIs the nth iteration voltage;
6) calculate Uref=UnCorresponding third impedance Zn；
7) In-line third impedance ZnAnd when other power grid parameters are unchanged, calculating by electromechanical transient analysis software to obtain the current line tide current value Pn；
8) Calculating the absolute value dP of the load flow difference rationIn which dP isn=︱(Pn-Pn-1)/Pn｜；
9) Determination of dPnFrom the deviation allowance delta if dPn<δ, then the calculation is finished, ZrefIs ZnIf dP isnAnd if the iteration number n = n +1, returning to the step 4 to continue the calculation.
2. The method for scaling the power flow control mode constant value of the distributed power flow controller according to claim 1, wherein in step 1), the impedance constant value Z is setrefIs calculated as follows: according to the power grid parameters, calculating by electromechanical transient analysis software to obtain the line current I without DPFC1，Zref=Uref/I1=Umax/I1。
3. The method for scaling the power flow control mode constant value of the distributed power flow controller according to claim 1, wherein in the step 2), the first impedance Z is1Is calculated as follows: according to the power grid parameters, calculating by electromechanical transient analysis software to obtain the line current I without DPFC1，Z1=Uref/I1=Umax/2I1。
4. The method for scaling the power flow control mode constant value of the distributed power flow controller according to claim 1, wherein in step 6), the third impedance Z isnIs calculated as follows: one size is equal to Zn-1The impedance of the transformer is connected into the line in series, and new line current I is obtained through electromechanical transient analysis software calculation according to new power grid parametersn，Zn=Un/In。
5. The method for scaling the fixed value of the power flow control mode of the distributed power flow controller according to claim 1, wherein in step 9), the allowable deviation value δ is set according to a maximum allowable deviation of the power flow.
6. The method for scaling the fixed value of the power flow control mode of the distributed power flow controller according to claim 2, wherein the allowable deviation value δ is 0.5% -1.5%.
7. The method according to claim 3, wherein the allowable deviation value δ is 1%.
8. The voltage control mode constant value conversion system of the distributed power flow controller is characterized in that the power flow control constant value P is convertedrefConversion to a constant value of impedance ZrefWhich comprises the following steps:
a first comparison unit for comparing the power flow control constant value PrefCorresponding to the power flow P when the output voltage of DPFC is maximummaxIf P is the size ofref≥PmaxThen, the mode is switched to an injection voltage mode, and the voltage of injection is controlled to be constant value UrefEqual to the maximum value of voltage UmaxAnd calculating a corresponding impedance constant value Zref(ii) a If Pref＜PmaxEntering the next step;
a first impedance calculating unit for calculating a voltage control constant value Uref=U1=UmaxFirst impedance Z corresponding to/21，U1Is a first iteration voltage;
an iteration number setting unit which sets an iteration number n = 2;
a first line load flow calculation unit for serially connecting a second impedance Z into the linen-1And when other power grid parameters are unchanged, calculating by electromechanical transient analysis software to obtain the current line tide current value Pn-1；
Second comparison unit, comparison Pn-1、PrefAnd PmaxIf P isn-1≤Pref<PmaxThen U isn=（Umax-Un-1) If P is 2ref＜Pn-1Then U isn=Un-1/2，UnIs the nth iteration voltage;
third impedance calculationUnit, calculating Uref=UnCorresponding third impedance Zn；
A second line load flow calculation unit for serially connecting a third impedance ZnAnd when other power grid parameters are unchanged, calculating by electromechanical transient analysis software to obtain the current line tide current value Pn(ii) a A power flow difference ratio absolute value calculating unit for calculating the power flow difference ratio absolute value dPnIn which dP isn=︱(Pn-Pn-1)/Pn｜；
A determination unit for determining dPnFrom the deviation allowance delta if dPn<δ, then the calculation is finished, ZrefIs ZnIf dP isnAnd if the iteration number n = n +1, returning to the first line load flow calculation unit for continuous calculation.
9. The distributed power flow controller voltage control mode scaling system of claim 8,
in the first comparison unit, the impedance value ZrefIs calculated as follows: according to the power grid parameters, calculating by electromechanical transient analysis software to obtain the line current I without DPFC1，Zref=Uref/I1=Umax/I1；
In the first impedance calculating unit, a first impedance Z1Is calculated as follows: according to the power grid parameters, calculating by electromechanical transient analysis software to obtain the line current I without DPFC1，Z1=Uref/I1=Umax/2I1；
In the third impedance calculating unit, the third impedance ZnIs calculated as follows: one size is equal to Zn-1The impedance of the power grid is connected into the line in series, and new line current I is obtained through electromechanical transient analysis software calculation according to new power grid parametersn，Zn=Un/In。
10. The distributed power flow controller voltage control mode fixed-value conversion system according to claim 8, wherein the deviation allowable value δ is set according to the maximum allowable deviation of impedance, and is 0.5% -1.5%.
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