CN115714404A - Commutation soft switching system for governing current unbalance of power distribution network and evaluation method - Google Patents
Commutation soft switching system for governing current unbalance of power distribution network and evaluation method Download PDFInfo
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Abstract
The invention provides a commutation soft switch system for governing current unbalance of a power distribution network and an evaluation method, wherein the commutation soft switch system is combined with a low-voltage commutation device and intelligent soft switch equipment to realize the power flow transfer of current among different phases, flexibly adjust the power flow transfer and current distribution among phases, and is beneficial to balancing the current difference among the three phases of the power distribution network, thereby improving the output efficiency of a power distribution transformer and reducing the network loss; according to the method, an optimization model based on network load flow constraint is established, the minimum current unbalance degree is taken as a target, the optimization model is solved, outgoing line currents of all phases and outgoing line average currents of three phases are obtained, and indexes for evaluating the phase change soft switch system to solve the current unbalance problem in the power distribution network are obtained according to the outgoing line currents of all the phases and the outgoing line average currents of the three phases.
Description
Technical Field
The invention relates to the technical field of power distribution networks, in particular to a phase-change soft switching system for treating current unbalance of a power distribution network and an evaluation method.
Background
At present, our country is accelerating the construction of new power systems mainly based on new energy, and new energy is being vigorously developed, and on the safe and reliable alternative basis of new energy, traditional energy is gradually withdrawn, electric power decarburization is accelerated, and clean transformation of energy is promoted. However, with the input of high-proportion clean energy, such as wind power, hydroelectric power and other units, the operation randomness and the volatility of the distribution network are more obvious, the unbalanced degree of the power output of the three phases is increased, and meanwhile, the distribution of the terminal single-phase load of the distribution network is often unbalanced, which also aggravates the unbalanced degree of the distribution network current, and causes the problems of the reduction of the output efficiency of the distribution transformer, the increase of the network line loss and the like. The intelligent soft switch can actively control the transfer of the tide between different nodes as a novel power electronic device, and has the advantages of real-time control, no switching action, rapid response and the like compared with the traditional connecting line. However, the current intelligent soft switching device can realize power flow transfer between the same phases, is difficult to realize balance of current between different phases, has limited promotion effect on treating the current imbalance problem, and lacks an evaluation method for treating the current imbalance problem by using the intelligent soft switching device with phase change.
Disclosure of Invention
Aiming at the defects in the prior art, the phase-change soft switching system and the evaluation method for treating the current imbalance of the power distribution network provided by the invention solve the following technical problems:
1. at present, the intelligent soft switch equipment can only realize the power flow transfer between the same phases, and the balance of current between different phases is difficult to realize;
2. an evaluation method for treating the current imbalance problem of the intelligent soft switching equipment with the commutation is lacked.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that: a commutation soft switching system for managing current imbalances in a power distribution network, comprising: the intelligent soft switching device comprises an inverter, a rectifier, a common capacitor, three low-voltage phase conversion devices and intelligent soft switching equipment;
the inverter and the rectifier are arranged on the three-phase transmission line, and a common capacitor is arranged between the inverter and the rectifier and is used as a common direct current end;
the wiring terminal of one side of each low-voltage phase-changing device is connected with one three-phase node of one end, and the three wiring terminals of the other side of each low-voltage phase-changing device are respectively connected with the three wiring terminals of the inverter in a one-to-one correspondence manner;
the intelligent soft switching device is arranged on the inverter and the rectifier.
Further, the system satisfies a three-phase power flow transfer relational expression, which is:
wherein, the first and the second end of the pipe are connected with each other,
for intelligent soft switchPrepare for the common active power at the connection node i,
for intelligent soft switch equipment at connection node i 1 The common active power of the electric machine (c),
for intelligent soft switch equipment at connection node i 2 Common active power of 1 First node, i, for connection of intelligent soft switching apparatus to three-phase transmission line 2 Second node, M, for connection of intelligent soft switching apparatus to three-phase transmission line k For the kth commutation matrix, k =1,2,3,
is a number of 0 or 1, and,
then, the ABC three-phase at the rectifying side is respectively connected with the ABC three-phase at the inverting side, (0, 1, 0) the ABC three-phase at the rectifying side is connected with the CAB three-phase at the inverting side, (0, 1) the ABC three-phase at the rectifying side is connected with the BCA three-phase at the inverting side,
for the active power of the intelligent soft switching device at the connection node i,
for the power loss of the intelligent soft switching device at the connection node i,
for the reactive power of the intelligent soft switching device at the connection node i,
for capacity of intelligent soft switch equipment at connection node iThe amount of the compound (A) is,
for the power loss coefficient of the intelligent soft switch device at the connection node i, i is taken as i in the same equation 1 Or i 2 Diag is the diagonal matrix function.
A method for evaluating a commutation soft switching system for governing current unbalance of a power distribution network comprises the following steps:
establishing an optimization model based on network power flow constraint by taking the minimum current imbalance degree as a target;
solving the optimization model based on the network power flow constraint to obtain outlet current of each phase and outlet average current of three phases;
and calculating the evaluation index of the commutation soft switch system for treating the current imbalance problem in the power distribution network according to the outgoing current of each phase and the outgoing average current of three phases.
Further, the optimization model based on the network power flow constraint is as follows:
wherein, the first and the second end of the pipe are connected with each other,
secondary side of transformer in power distribution network
Outlet current of phase, I A,0 For the outgoing current, I, of the secondary side A phase of the transformer in the distribution network B,0 For the outgoing current, I, of the secondary side B phase of the transformer in the distribution network C,0 The method is characterized in that the I | is absolute value operation and min is minimum value calculation for outgoing line current of a secondary side C phase of a transformer in a power distribution network.
Further, the network power flow constraint is as follows:
s t ＝diag(S tj )-diag(S lt -z lt L lt )
or
Wherein t, j and l are three-phase nodes at different positions, s t Injected power, S, for the t-th three-phase node tj For the apparent power of the branch connecting the tth three-phase node with the jth three-phase node,
the maximum value of apparent power of the branch circuit connected with the tth three-phase node and the jth three-phase node, S lt Apparent power, z, of the branch connecting the l-th three-phase node with the t-th three-phase node lt Impedance of the branch connecting the L-th three-phase node and the t-th three-phase node, L lt The current square term of the branch circuit connected with the L-th three-phase node and the t-th three-phase node is L tj For the branch of the tth three-phase node connected with the jth three-phase nodeThe square term of the current of (c) is,
for the active power of the intelligent soft switching device at the three-phase node t,
for the reactive power of the intelligent soft switching device at the connecting three-phase node t,
the active load of the t-th three-phase node,
is the reactive load of the t-th three-phase node, v j Is the square term of the voltage of the jth three-phase node, v t As the square term of the voltage of the t-th three-phase node,v t is the minimum value of the square term of the voltage of the t-th three-phase node,
is the maximum value of the square term of the voltage of the t-th three-phase node, z tj Is the impedance of the branch circuit connected between the tth three-phase node and the jth three-phase node, and H is the conjugate transpose, rank]Rank operation for the matrix, V t Node voltage of the t-th three-phase node, I tj Is the current of the branch connecting the tth three-phase node with the jth three-phase node,
is the Hermitian matrix, diag is the diagonal matrix function, and g is the imaginary unit.
Further, the formula for calculating the evaluation index of the commutation soft switching system for treating the current imbalance problem in the power distribution network is as follows:
wherein R is I Harnessing electricity in a power distribution network for a phase change soft switching systemAn evaluation index of the flow imbalance problem,
in order to take the maximum value of the sequence,
secondary side of transformer in power distribution network
The current of the outgoing line of the phase,
the average outgoing line current of the ABC phases of the secondary side of the transformer in the power distribution network is represented by A, B and C.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
1. the phase-change soft switching system disclosed by the invention is combined with the low-voltage phase-change device and the intelligent soft switching equipment, realizes the power flow transfer of current between different phases, flexibly adjusts the power flow transfer and current distribution between phases, and is favorable for balancing the current difference between three phases of a power distribution network, thereby improving the output efficiency of the power distribution transformer and reducing the network loss.
2. According to the method, an optimization model based on network power flow constraint is established, the minimum current unbalance degree is taken as a target, the optimization model is solved, outgoing line currents of all phases and outgoing line average currents of three phases are obtained, and indexes for evaluating the current unbalance problem in the phase-change soft switch system governing power distribution network are obtained through the outgoing line currents of all the phases and the outgoing line average currents of the three phases.
Drawings
FIG. 1 is a schematic diagram of a commutation soft switching system for managing current imbalance in a power distribution network;
fig. 2 is a flowchart of an evaluation method of a commutation soft switching system for managing current imbalance of a power distribution network.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
As shown in fig. 1, a commutation soft switching system for managing current imbalance of a power distribution network includes: the system comprises an inverter, a rectifier, a common capacitor, three low-voltage phase change devices and intelligent soft switching equipment;
the inverter and the rectifier are arranged on the three-phase transmission line, and a common capacitor is arranged between the inverter and the rectifier and serves as a common direct current end;
the wiring terminal of one side of each low-voltage phase-changing device is connected with one three-phase node of one end, and the three wiring terminals of the other side of each low-voltage phase-changing device are respectively connected with the three wiring terminals of the inverter in a one-to-one correspondence manner;
the intelligent soft switching device is arranged on the inverter and the rectifier.
The system meets a three-phase power flow transfer relational expression which is as follows:
wherein the content of the first and second substances,
for the common active power of the intelligent soft switching devices at the connection node i,
for intelligent soft switch equipment at connection node i 1 The common active power of the station(s),
for intelligent soft switch equipment at connection node i 2 Common active power of 1 First node, i, for connection of intelligent soft switching apparatus to three-phase transmission line 2 Second node, M, for connection of intelligent soft switching apparatus to three-phase transmission line k For the kth commutation matrix, k =1,2,3,
is a number of 0 or 1, and,
then, the three ABC phases at the rectifying side are respectively connected with the three ABC phases at the inverting side, (0, 1, 0) the three ABC phases at the rectifying side are connected with the three CAB phases at the inverting side, and (0, 1) the three ABC phases at the rectifying side are connected with the three BCA phases at the inverting side,
for the active power of the intelligent soft switching device at connection node i,
for the power loss of the intelligent soft switching device at the connection node i,
for the reactive power of the intelligent soft switching device at the connection node i,
for the capacity of the intelligent soft switching device at the connection node i,
for the power loss coefficient of the intelligent soft switch equipment at the connecting node i, i is taken as i in the same equation 1 Or i 2 Diag is a diagonal matrix function.
The three ABC phases on the rectifying side are respectively connected with the three ABC phases on the inverting side, (0, 1, 0) shows that the three ABC phases on the rectifying side are connected with the three CAB phases on the inverting side, and (0, 1) shows that the three ABC phases on the rectifying side are connected with the three BCA phases on the inverting side:
(1, 0) indicates that the rectification side A is connected with the inversion side A phase, the rectification side B is connected with the inversion side B phase, and the rectification side C is connected with the inversion side C phase; (0, 1, 0) indicates that the rectification side A is connected with the inversion side C phase, the rectification side B is connected with the inversion side A phase, and the rectification side C is connected with the inversion side B phase; (0, 1) indicates that the rectification side A is connected to the inversion side B phase, the rectification side B is connected to the inversion side C phase, and the rectification side C is connected to the inversion side A phase.
As shown in fig. 2, an evaluation method of a commutation soft switching system for managing current imbalance of a power distribution network includes the following steps:
s1, establishing an optimization model based on network power flow constraint by taking the minimum current unbalance degree as a target;
in step S1, the optimization model based on the network power flow constraint is:
wherein, the first and the second end of the pipe are connected with each other,
secondary side of transformer in power distribution network
Outlet current of phase, I A,0 For the outgoing current, I, of the secondary side A phase of a transformer in a distribution network B,0 For the outgoing current, I, of the secondary side B phase of the transformer in the distribution network C,0 The method is characterized in that the I | is absolute value operation and min is minimum value calculation for outgoing line current of a secondary side C phase of a transformer in a power distribution network.
The network flow constraint is as follows:
s t ＝diag(S tj )-diag(S lt -z lt L lt )
or
Wherein t, j and l are three-phase nodes at different positions, s t Injected power for the t-th three-phase node, S tj For the apparent power of the branch connecting the tth three-phase node with the jth three-phase node,
is the maximum value of the apparent power of the branch circuit connected with the tth three-phase node and the jth three-phase node, S lt Apparent power, z, of the branch connecting the l-th three-phase node with the t-th three-phase node lt Impedance of the branch connecting the L-th three-phase node and the t-th three-phase node, L lt The square term of the current of the branch connecting the L-th three-phase node and the t-th three-phase node, L tj Is the current square term of the branch circuit connected with the tth three-phase node and the jth three-phase node,
for the active power of the intelligent soft switching device at the connecting three-phase node t,
for the reactive power of the intelligent soft switching device at the connecting three-phase node t,
is the active load of the t-th three-phase node,
for reactive loads of the t-th three-phase node, v j Is the square term of the voltage of the jth three-phase node, v t As the square term of the voltage of the t-th three-phase node,v t is the minimum value of the square term of the voltage of the t-th three-phase node,
is the maximum value of the square term of the voltage of the t-th three-phase node, z tj Is the impedance of the branch circuit connecting the t-th three-phase node and the j-th three-phase node, and H is the conjugate transpose, rank [ [ alpha ] ]]Rank operation for matrix, V t Is as followsNode voltages of t three-phase nodes, I tj Is the current of the branch connecting the tth three-phase node with the jth three-phase node,
is the Hermitian matrix, diag is the diagonal matrix function, and g is the imaginary unit.
S2, solving the optimization model based on the network power flow constraint to obtain outlet current of each phase and outlet average current of three phases;
and S3, calculating an evaluation index of the commutation soft switch system for treating the current imbalance problem in the power distribution network according to the outgoing current of each phase and the outgoing average current of three phases.
In step S3, the formula for calculating the evaluation index of the commutation soft switching system for treating the current imbalance problem in the power distribution network is as follows:
wherein R is I For the evaluation index of the commutation soft switch system for treating the current imbalance problem in the power distribution network,
in order to take the maximum value of the sequence,
secondary side of transformer in power distribution network
The current of the outgoing line of the phase,
the average outgoing line current of the ABC phases of the secondary side of the transformer in the power distribution network is represented by A, B and C.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
1. the phase-change soft switching system disclosed by the invention is combined with the low-voltage phase-change device and the intelligent soft switching equipment, realizes the power flow transfer of current between different phases, flexibly adjusts the power flow transfer and current distribution between phases, and is favorable for balancing the current difference between three phases of a power distribution network, thereby improving the output efficiency of the power distribution transformer and reducing the network loss.
2. According to the method, an optimization model based on network power flow constraint is established, the minimum current unbalance degree is taken as a target, the optimization model is solved, outgoing line currents of all phases and outgoing line average currents of three phases are obtained, and indexes for evaluating the current unbalance problem in the phase-change soft switch system governing power distribution network are obtained through the outgoing line currents of all the phases and the outgoing line average currents of the three phases.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A commutation soft switching system for managing current imbalance in a power distribution network, comprising: the system comprises an inverter, a rectifier, a common capacitor, three low-voltage phase change devices and intelligent soft switching equipment;
the inverter and the rectifier are arranged on the three-phase transmission line, and a common capacitor is arranged between the inverter and the rectifier and is used as a common direct current end;
the wiring terminal of one side of each low-voltage phase-changing device is connected with one three-phase node of one end, and the three wiring terminals of the other side of each low-voltage phase-changing device are respectively connected with the three wiring terminals of the inverter in a one-to-one correspondence manner;
the intelligent soft switching device is arranged on the inverter and the rectifier.
2. A commutation soft switching system for managing current imbalances in an electrical distribution network according to claim 1 wherein the system satisfies the three-phase power flow transfer relationship:
wherein the content of the first and second substances,
for the common active power of the intelligent soft switching devices at the connection node i,
for intelligent soft switch equipment at connection node i 1 The common active power of the electric machine (c),
for intelligent soft switch equipment at connection node i 2 Common active power of 1 First node, i, for connection of intelligent soft switching apparatus to three-phase transmission line 2 For intelligent soft switching equipment and three phasesSecond node of transmission line connection, M k K =1,2,3,
is a number of 0 or 1, and,
then, the ABC three-phase at the rectifying side is respectively connected with the ABC three-phase at the inverting side, (0, 1, 0) the ABC three-phase at the rectifying side is connected with the CAB three-phase at the inverting side, (0, 1) the ABC three-phase at the rectifying side is connected with the BCA three-phase at the inverting side,
for the active power of the intelligent soft switching device at connection node i,
for the power loss of the intelligent soft switching device at the connection node i,
for the reactive power of the intelligent soft switching device at the connection node i,
for the capacity of the intelligent soft switching device at the connection node i,
for the power loss coefficient of the intelligent soft switch equipment at the connecting node i, i is taken as i in the same equation 1 Or i 2 Diag is the diagonal matrix function.
3. A method for evaluating a commutation soft switching system for managing current imbalance in a power distribution network according to any one of claims 1 to 2, comprising:
establishing an optimization model based on network power flow constraint by taking the minimum current unbalance degree as a target;
solving the optimization model based on the network power flow constraint to obtain outlet current of each phase and outlet average current of three phases;
and calculating the evaluation index of the commutation soft switch system for treating the current imbalance problem in the power distribution network according to the outgoing current of each phase and the outgoing average current of three phases.
4. The evaluation method for the commutation soft switching system for governing the current imbalance of the power distribution network according to claim 3, wherein the optimization model based on the network power flow constraint is as follows:
wherein the content of the first and second substances,
secondary side of transformer in power distribution network
Outlet current of phase, I A,0 For the outgoing current, I, of the secondary side A phase of a transformer in a distribution network B,0 For the outgoing current, I, of the secondary side B phase of the transformer in the distribution network C,0 The method is characterized in that the I | is absolute value operation and min is minimum value calculation for outgoing line current of a secondary side C phase of a transformer in a power distribution network.
5. The method for evaluating a commutation soft switching system for managing current imbalance in a power distribution network according to claim 4, wherein the network power flow constraint is:
s t ＝diag(S tj )-diag(S lt -z lt I lt )
or
Wherein t, j and l are three-phase nodes at different positions, s t Injected power, S, for the t-th three-phase node tj For the apparent power of the branch connecting the tth three-phase node with the jth three-phase node,
is the maximum value of the apparent power of the branch circuit connected with the tth three-phase node and the jth three-phase node, S lt Apparent power, z, of the branch connecting the l-th three-phase node with the t-th three-phase node lt Impedance of the branch connecting the L-th three-phase node and the t-th three-phase node, L lt The current square term of the branch circuit connected with the L-th three-phase node and the t-th three-phase node is L tj Is the square term of the current of the branch connecting the tth three-phase node and the jth three-phase node,
for the active power of the intelligent soft switching device at the three-phase node t,
for the reactive power of the intelligent soft switching device at the connecting three-phase node t,
the active load of the t-th three-phase node,
is the reactive load of the t-th three-phase node, v j Is the square term of the voltage of the jth three-phase node, v t As the square term of the voltage of the tth three-phase node,v t is the minimum value of the square term of the voltage of the t-th three-phase node,
is the maximum value of the square term of the voltage of the t-th three-phase node, z tj Is the impedance of the branch circuit connecting the t-th three-phase node and the j-th three-phase node, and H is the conjugate transpose, rank [ [ alpha ] ]]Rank operation for matrix, V t Is the node voltage of the t-th three-phase node, I tj Is the current of the branch connecting the tth three-phase node with the jth three-phase node,
is the hermitian matrix, diag is the diagonal matrix function, and g is the imaginary unit.
6. The method for evaluating the phase-change soft switching system for governing the current imbalance of the power distribution network according to claim 3, wherein the formula for calculating the evaluation index of the phase-change soft switching system for governing the current imbalance problem in the power distribution network is as follows:
wherein R is I For the evaluation index of the commutation soft switch system for treating the current imbalance problem in the power distribution network,
in order to take the maximum value of the sequence,
secondary side of transformer in power distribution network
The outgoing line current of the phase is,
the average outgoing line current of the ABC phases of the secondary side of the transformer in the power distribution network is represented by A, B and C.
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| CN116995732A (en) * | 2023-09-21 | 2023-11-03 | 天津滨电电力工程有限公司 | Photovoltaic grid-connected control device and method with phase selection grid-connected and power regulation functions |
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