CN114336641B - A three-phase power supply ride through power utilization system and control method - Google Patents

Abstract

The invention provides a three-phase power supply ride-through power utilization system and a control method, and relates to the field of traction power supply system circuit design. The system comprises a power conversion device PCD1 and a controller CC1 which are arranged on a main substation MS1, a power conversion device PCD2 and a controller CC2 which are arranged on a main substation MS2, and a three-phase bilateral cable TC is adopted between the main substation MS1 and the main substation MS2 to supply power to a traction network TN; the controller CC1 is used for acquiring power information of the main substation MS1 in real time, and the controller CC2 is used for acquiring power information of the main substation MS2 in real time; the controller CC1 and the controller CC2 perform information interaction on the OFL through an optical fiber, the controller CC1 controls the power conversion device PCD1 to utilize the traversing power according to the information interaction result or the controller CC2 controls the power conversion device PCD2 to utilize the traversing power according to the information interaction result, so that the traversing power returned to the power grid meets the preset requirement.

Description

A three-phase power supply ride through power utilization system and control method

technical field

The invention relates to the field of circuit design of traction power supply systems, in particular to a three-phase power supply ride-through power utilization system and a control method.

Background technique

Rail transit power supply system is divided into DC system and AC system. The direct current system is generally adopted in urban rail transit, mainly subway and light rail. The DC system has problems such as insurmountable stray current pollution and difficulty in regenerative braking energy recovery. The main line railway mainly adopts the power frequency single-phase AC system. The single-phase power-frequency AC system has obvious shortcomings: power quality problems mainly based on negative sequence, train speed and traction loss caused by electrical phase separation, and electrical transient problems between trains and networks caused by trains passing through electrical phase separation.

Three-phase power supply can completely solve the problems of DC system and AC system, and under the same power supply capacity, three-phase system saves materials in manufacturing and construction compared with single-phase system, and has simple structure and excellent performance. In addition, the instantaneous value of the three-phase electric power remains constant. The three-phase system also uses the cancellation of the on-board transformer to reduce the axle load of the train, realize the lightweight of the train, and improve the carrying efficiency and running speed.

The three-phase cable of three-phase power supply forms a parallel structure with the power grid. There is power and current flowing in parallel with the power grid in the three-phase cable. The corresponding power is called ride-through power (the corresponding current is called balanced current). The power flows in from the main substation on one side of the three-phase power supply system and flows out from the main substation on the other side, that is, the main substation where the crossover power flows into the three-phase cable from the power grid is in a load (power consumption) state, and the crossover power flows into the three-phase cable. The main substation that flows into the grid from the three-phase cable is in a power generation state. The impact of ride-through power on the power grid and the metering problem cannot be ignored. If the ride-through power is returned to the power grid, it is equivalent to generating electricity from the main substation. If the ride-through power is returned to the power grid, it is treated as power generation and will be offset by the electricity consumption of another main substation, so the user has no economic loss. If the ride-through power is returned to the power grid In this case, it is necessary to study how the three-phase power supply can reduce the ride-through power, or how to use the ride-through power to make full use of the advantages of the three-phase power supply while reducing the impact on the grid and the power grid. The influence of users, improve the efficiency of electricity consumption.

Some methods for suppressing ride-through power have been proposed, such as Chinese Patent 1 "A Bilateral Power Supply System for Electrified Railway" (authorized announcement No.: CN103552488B), and Chinese Patent 2 "A Bilateral Power Supply Method for Electrified Railway" (authorized announcement No.: CN110126682B) etc. However, these methods are all for single-phase traction power supply system, and there is no research on ride-through power suppression of three-phase power supply. In addition, considering the problem that the key to the ride-through power is the power returned to the power grid, the inventor of the present application has changed his thinking and proposed a ride-through power utilization technology of three-phase power supply for electrified railways, so that the ride-through power can be converted into usable power and Electric energy, so that the power returned to the grid meets the requirements, or even 0. The "A Traction Network Bilateral Power Supply Ride-Through Power Utilization System and Control Method" filed on the same day as this application focuses on the ride-through power utilization technology in single-phase traction power supply, and this application focuses on the ride-through power utilization technology in three-phase traction power supply.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a three-phase power supply ride-through power utilization system, which can effectively solve the technical problem of utilization of ride-through power existing between the main substation MS1 and the main substation MS2.

The present invention is realized by the following technical means: a three-phase power supply ride-through power utilization system, comprising a power conversion device PCD1 and a controller CC1 arranged in the main substation MS1, and the power conversion device PCD1 is connected with the three-phase busbar MB1 through the AC port J1 ; Three-phase busbar MB1 is respectively set with voltage transformer Ya1, voltage transformer Yb1 and voltage transformer Yc1; three-phase feeder Fa1, feeder Fb1 and feeder Fc1 are respectively set with current transformer La1, current transformer Lb1 and current transformer Lc1; three Phase feeder Fd1, feeder Fe1 and feeder Ff1 are respectively provided with current transformer Ld1, current transformer Le1 and current transformer Lf1; the voltage transformer Ya1, voltage transformer Yb1 and voltage transformer Yc1, current transformer La1, current transformer The measuring terminals of the controller Lb1 and the current transformer Lc1 and the current transformer Ld1, the current transformer Le1 and the current transformer Lf1 are all connected with the input terminal of the controller CC1; it also includes the power conversion device PCD2 and The controller CC2 and the power conversion device PCD2 are connected to the three-phase busbar MB2 through the AC port J2; the three-phase busbar MB2 is respectively provided with voltage transformer Ya2, voltage transformer Yb2 and voltage transformer Yc2; three-phase feeder Fa2, feeder Fb2 and feeder Fc2 Set current transformer La2, current transformer Lb2 and current transformer Lc2 respectively, three-phase feeder Fd2, feeder Fe2 and feeder Ff2 respectively set current transformer Ld2, current transformer Le2 and current transformer Lf2;

The voltage transformer Ya2, voltage transformer Yb2, voltage transformer Yc2, current transformer La2, current transformer Lb2, current transformer Lc2, and the measurement terminals of current transformer Ld2, current transformer Le2 and current transformer Lf2 are all Connect to the input terminal of the controller CC2;

The controller CC1 and the controller CC2 are connected to the OFL through optical fibers and perform information exchange, wherein:

The three-phase bilateral cable TC is used between the main substation MS1 and the main substation MS2 to supply power to the traction network TN. The three-phase bilateral cable TC is connected to the traction network TN through one or more three-phase traction transformers. The contact-type receiving current provides electric power to the train;

The controller CC1 is used to acquire the power information of the main substation MS1 in real time, and the controller CC2 is used to acquire the power information of the main substation MS2 in real time;

The controller CC1 and the controller CC2 respectively control the power conversion device PCD1 and the power conversion device PCD2 to utilize the ride-through power according to the information exchange result, so that the ride-through power returned to the grid from the main substation MS1 or from the main substation MS2 meets the preset requirements.

The main substation MS1 adopts three-phase power supply. The primary side of the main substation MS1 is connected to the three-phase power grid, and the secondary side is connected to the three-phase busbar MB1. The three-phase busbar MB1 passes through the three-phase feeder Fa1, feeder Fb1 and feeder Fc1. Supply power to the three-phase bilateral cable TC, the three-phase bus MB1 supplies power to the three-phase bilateral cable TCa in the left adjacent power supply section through the three-phase feeder Fd1, feeder Fe1 and feeder Ff1 respectively, and the three-phase bilateral cable TCa in the left adjacent power supply section passes through one or A number of transformers feed the traction network TN.

The main substation MS2 adopts three-phase power supply, the primary side of the main substation MS2 is connected to the three-phase power grid, the secondary side is connected to the three-phase busbar MB2, and the three-phase busbar MB2 passes through the three-phase feeder Fa2, feeder Fb2 and feeder Fc2 Supply power to the three-phase bilateral cable TC, and the three-phase bus MB2 supplies power through the three-phase feeder Fd2, the feeder Fe2, and the feeder Ff2, respectively, to supply power to the three-phase bilateral cable TCb in the right adjacent power supply section; the three-phase bilateral cable TCb in the right adjacent power supply section passes through One or more transformers supply the traction network TN.

The power conversion device PCD1 includes a converter device MPC1, a converter device DPC1, an energy storage device ES1, a positive bus PB1 and a negative bus NB1; the converter MPC1 is a three-phase converter system, and its AC side passes through the AC port J1. They are respectively connected with the three-phase busbar MB1; the converter device DPC1 is a three-phase converter system, and its AC side is respectively connected with the three-phase busbar a, busbar b, and busbar c of the power distribution system of the substation; the converter device The positive and negative electrodes of the DC side of the MPC1, the converter device DPC1 and the energy storage device ES1 are respectively connected to the corresponding positive and negative bus bars PB1 and NB1; the control end of the controller CC1 is connected to the control end of the power conversion device PCD1.

The power conversion device PCD2 includes a converter device MPC2, a converter device DPC2, an energy storage device ES2, a positive bus PB2 and a negative bus NB2; the converter MPC2 is a three-phase converter system, and its AC side passes through the AC port J2 They are respectively connected with the three-phase busbar MB2; the converter device DPC2 is a three-phase converter system, and its AC side is respectively connected with the three-phase busbar u, busbar v, and busbar w of the power distribution system of the substation; the converter device The positive and negative electrodes of the DC side of the MPC2, the converter device DPC2 and the energy storage device ES2 are respectively connected to the corresponding positive busbar PB2 and the negative electrode busbar NB2; the control terminal of the controller CC2 is connected to the control terminal of the power conversion device PCD2.

The second object of the present invention is to provide a control method based on the above-mentioned three-phase power supply ride-through power utilization system, the method comprising:

The controller CC1 and the controller CC2 obtain the real-time power information of the main substation MS1 and the main substation MS2 respectively;

The controller CC1 and the controller CC2 perform information exchange according to the real-time power information obtained by each;

The controller CC1 controls the power conversion device PCD1 to use the ride-through power according to the information exchange result; or, the controller CC2 controls the power conversion device PCD2 to use the ride-through power according to the information exchange result, so that the ride-through power returned to the grid from the main substation MS1 or the ride-through power from the main transformer substation MS1. The ride-through power of the power station MS2 back to the grid meets the preset requirements.

The main substation MS1 and the main substation MS2 both use three-phase power supply, wherein:

The real-time acquisition of the power information of the main substation MS1 by the controller CC1 includes: the controller CC1 detects in real time the voltage Uabc1 of the three-phase bus MB1, the current Ia1 of the three-phase feeder Fa1, the feeder Fb1 and the feeder Fc1, the current Ib1 and the current Ic1, The current Id1, current Ie1 and current If1 of the three-phase feeder Fd1, feeder Fe1 and feeder Ff1; the controller CC1 calculates the main substation MS1 according to the voltage Uabc1 of the three-phase bus MB1, the current Ia1, the current Ib1 and the current Ic1 of the three-phase feeder The active power P1 provided to the three-phase bilateral cable TC, the controller CC1 calculates the three-phase adjacent power supply section to the left of the main substation MS1 according to the voltage Uabc1 of the three-phase bus MB1, the current Id1, the current Ie1 and the current If1 of the three-phase feeder Active power P1a provided by the bilateral cable TCa;

The real-time acquisition of the power information of the main substation MS2 by the controller CC2 includes: the controller CC2 detects in real time the voltage Uabc2 of the three-phase bus MB2, the three-phase feeder Fa2, the current Ia2 of the feeder Fb2 and the feeder Fc2, the current Ib2 and the current Ic2, Current Id2, current Ie2 and current If2 of the three-phase feeder Fd2, feeder Fe2 and feeder Ff2; the controller CC2 calculates the voltage Uabc2, current Id2, current Ie2 and current If2 of the three-phase bus MB2 according to the three-phase bilateral voltage of the main substation MS2. The active power P2 provided by the cable TC, the controller CC2 calculates the active power P2b provided by the three-phase bilateral cable TCb in the right adjacent power supply section of the main substation MS2 according to the voltage Uabc2, current Id2, current Ie2 and current If2 of the three-phase bus MB2 ;

Among them, the power of the substation flowing to the three-phase bilateral cable is positive, and the power of the three-phase bilateral cable flowing to the traction substation is negative.

The information exchange between the controller CC1 and the controller CC2 according to the real-time power information obtained by each includes: the controller CC1 sends the data of the active power P1 and the active power P1a to the OFL through the optical fiber to the controller CC2, and the controller CC2 sends the OFL through the optical fiber to the OFL. The active power P2 and active power P2b data are sent to the controller CC1.

The controller CC1 controls the power conversion device PCD1 to use the ride-through power according to the information exchange result, and the controller CC2 controls the power conversion device PCD2 to use the ride-through power according to the information exchange result, so that the ride-through power returned from the main substation MS1 to the power grid or the ride-through power from the main substation MS1 is returned. The ride-through power of the power station MS2 back to the grid meets the preset requirements, including:

If P1>0 and P2<0, and P1+P2=0, the controller CC1 and the controller CC2 determine that the three-phase bilateral cable TC is no-load; in the formula, P1 and P2 are the ride-through power, and the three-phase feeder Fa1, Feeder Fb1 and feeder Fc1 flow to three-phase feeder Fa2, feeder Fb2 and feeder Fc2; at this time: if the active power P1≥P2b≥0, the controller CC2 controls the power conversion device PCD2 to the three-phase busbar u, busbar v of the power distribution system , bus w power supply, or make the energy storage device ES2 run in the energy storage state; when the sum of the two powers = P1-P2b, the controller CC1 controls the power conversion device PCD1 to stand by; if the active power P2b≥P1, the controller CC2 controls the power conversion device PCD2 to stand by, while the controller CC1 controls the power conversion device PCD1 to stand by;

If P2>0 and P1<0, and P1+P2=0, the controller CC1 and the controller CC2 determine that the three-phase bilateral cable TC is no-load, in the formula, P1 and P2 are the ride-through power, and the three-phase feeder Fa2, Feeder Fb2 and feeder Fc2 flow to the three-phase feeder Fa1, feeder Fb1 and feeder Fc1. At this time: if the active power P2≥P1a≥0, the controller CC1 controls the power conversion device PCD1 to the three-phase bus a, bus b, Bus c supplies power or makes the energy storage device ES1 run in the energy storage state; when the sum of the two powers = P2-P1a, the controller CC2 controls the power conversion device PCD2 to stand by; if the active power P1a ≥ P2, the controller CC1 controls the power The conversion device PCD1 is in standby, while the controller CC2 controls the power conversion device PCD2 to be in standby;

If |P1+P2|>0, and P1>0 and P2>0, the controller CC1 and the controller CC2 determine that the three-phase bilateral cable TC is in the traction condition, then the controller CC1 controls the power conversion device PCD1 to make the energy storage device ES1 When running in the discharge state, the discharge power of the energy storage device ES1≤P1, and the controller CC2 controls the power conversion device PCD2 to make the energy storage device ES2 run in the discharge state, and the discharge power of the energy storage device ES2≤P2.

The controller CC1 controls the power conversion device PCD1 to use the ride-through power according to the information exchange result, and the controller CC2 controls the power conversion device PCD2 to use the ride-through power according to the information exchange result, so that the ride-through power returned from the main substation MS1 to the power grid or the ride-through power from the main substation MS1 is returned. The ride-through power of the power station MS2 back to the grid meets the preset requirements, including:

If P1 < 0 and P2 < 0, the controller CC1 and the controller CC2 determine that the three-phase bilateral cable TC is in the braking condition. At this time: if P1a < 0, the controller CC1 controls the power conversion device PCD1 to the power distribution system three. Phase bus a, bus b, bus c supply power or make the energy storage device ES1 run in the energy storage state; when the sum of the two powers = |P1|+|P1a |, if P1a>0 and P1a<|P1|, then The controller CC1 controls the power conversion device PCD1 to supply power to the three-phase bus a, bus b, and bus c of the power distribution system; or, makes the energy storage device ES1 run in the energy storage state; when the sum of the two powers = | P1 |-|P1a | time; if P1a>0 and P1a≥|P1|, the controller CC1 controls the power conversion device PCD1 to stand by;

If P2b<0, the controller CC2 controls the power conversion device PCD2 to supply power to the three-phase bus u, bus v, and bus w of the power distribution system; or, makes the energy storage device ES2 run in the energy storage state, when the sum of the two powers = When |P2|+|P2b|, if P2b>0 and P2b<|P2|, the controller CC2 controls the power conversion device PCD2 to supply power to the three-phase bus u, bus v, and bus w of the power distribution system; The device ES2 operates in the energy storage state, when the sum of the two powers=|P2|-|P2b|; if P2b>0 and P2b≥|P2|, the controller CC2 controls the power conversion device PCD1 to stand by.

The working principle of the invention is as follows: the three-phase bilateral cable and the power grid form a parallel structure for three-phase power supply, and the power and current flowing in parallel with the power grid in the three-phase bilateral cable, and the corresponding power is called the ride-through power (the corresponding current is called the ride-through power). equalizing current). The ride-through power flows in from the main substation on one side of the three-phase power supply system, and flows out from the main substation on the other side, that is, the ride-through power flows into the three-phase cable from the power grid to the main substation in the load (power consumption) state, and the ride-through power flows into the three-phase cable. The main substation where power flows from the three-phase cable into the grid is in a generating state. There will also be charging current and charging power in the distributed capacitance of transmission lines, three-phase bilateral cables, and traction networks. The traversing power flows along the three-phase bilateral cable and belongs to the longitudinal component, while the charging power, like the load, is called the transverse component. When the three-phase bilateral cable is unloaded, the active component of the ride-through power can be selected to reflect the ride-through situation, and it can be measured at any convenient part of the incoming line of the substation, the three-phase feeder and the three-phase double-sided cable. If the traction load produces a large lateral component, which is equal to or greater than the value of the ride-through power returned to the grid, only the lateral component effect is exhibited, that is, the equivalent traction condition. Use the voltage and current information of the three-phase power supply and two substations to determine the operating conditions of the three-phase bilateral cable: under no-load conditions, the ride-through power is stored in the energy storage device or converted to the substation through the power conversion device. The power consumption system makes the ride-through power returned to the power grid meet the preset requirements; under the traction condition (or equivalent traction condition), the energy storage device releases energy for the train to use; under the braking condition, the power conversion device The regenerative power and the ride-through power are stored together in the energy storage device or converted to the substation's own power system, so that the power returned to the grid meets the preset requirements.

Compared with the prior art, the beneficial effects of the present invention are:

1. Without changing the three-phase power supply structure of the power grid to the electrified railway, the ride-through power can be utilized, the negative impact of ride-through power on the power grid and users is eliminated, and the advantages of three-phase power supply can be fully utilized.

2. It is conducive to the utilization of regenerative energy of three-phase power supply, and improves the direct utilization rate of regenerative braking energy. Under normal circumstances, the regenerative power and electric energy returned to the grid can meet the preset requirements or even be reduced to 0.

3. The power conversion device can be connected to the energy storage device and the power distribution system for power supply. In addition to using the ride-through power, it can also use the remaining regenerative braking energy.

Fourth, the technology is advanced, reliable and easy to implement.

Description of drawings

Figure 1 is a schematic diagram of the connection between the three-phase power supply and the grid.

Figure 2 is a schematic structural diagram of the present invention.

FIG. 3 is a schematic structural diagram of the power conversion device PCD1 of the present invention.

FIG. 4 is a schematic structural diagram of the power conversion device PCD2 of the present invention

FIG. 5 is a flow chart of the control method of the present invention.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

Example 1

The single-line schematic diagram of the connection between the three-phase power supply and the power grid is shown in Figure 1. The three-phase bilateral cable TC forms a parallel structure with the power grid G through the main substations MS1 and MS2 on both sides. It can be known from the parallel shunt principle that a current component parallel to the grid G will be generated on the three-phase bilateral cable TC, which is called the balance current, and the ride-through power will be generated, which will affect the electricity billing problem of the railway. If the electricity billing on the primary side of the two main substations with three-phase power supply adopts the method of back-counting, the problem can be solved very well. to this end,

As shown in FIG. 2 , this embodiment provides a three-phase power supply ride-through power utilization system, including a power conversion device PCD1 and a controller CC1 disposed in the main substation MS1, and the power conversion device PCD1 communicates with the three-phase bus through the AC port J1 MB1 is connected; three-phase bus MB1 is provided with voltage transformer Ya1, voltage transformer Yb1 and voltage transformer Yc1 respectively; three-phase feeder Fa1, feeder Fb1 and feeder Fc1 are respectively equipped with current transformer La1, current transformer Lb1 and current transformer Lc1 ; Three-phase feeder Fd1, feeder Fe1 and feeder Ff1 are respectively provided with current transformer Ld1, current transformer Le1 and current transformer Lf1; the voltage transformer Ya1, voltage transformer Yb1 and voltage transformer Yc1, current transformer La1, The current transformer Lb1, the current transformer Lc1 and the measurement terminals of the current transformer Ld1, the current transformer Le1 and the current transformer Lf1 are all connected to the input terminal of the controller CC1; it also includes a power conversion device arranged in the main substation MS2 PCD2 and the controller CC2, the power conversion device PCD2 is connected to the three-phase busbar MB2 through the AC port J2; the three-phase busbar MB2 is respectively provided with voltage transformer Ya2, voltage transformer Yb2 and voltage transformer Yc2; three-phase feeder Fa2, feeder Fb2 and The feeder Fc2 is respectively provided with a current transformer La2, a current transformer Lb2 and a current transformer Lc2, and the three-phase feeder Fd2, the feeder Fe2 and the feeder Ff2 are respectively provided with a current transformer Ld2, a current transformer Le2 and a current transformer Lf2;

The voltage transformer Ya2, voltage transformer Yb2, voltage transformer Yc2, current transformer La2, current transformer Lb2, current transformer Lc2, and the measurement terminals of current transformer Ld2, current transformer Le2 and current transformer Lf2 are all Connect to the input terminal of the controller CC2;

The controller CC1 and the controller CC2 are connected to the OFL through optical fibers and perform information exchange, wherein:

The three-phase bilateral cable TC is used between the main substation MS1 and the main substation MS2 to supply power to the traction network TN. The three-phase bilateral cable TC is connected to the traction network TN through one or more three-phase traction transformers. The contact-type receiving current provides electric power to the train;

The controller CC1 is used to acquire the power information of the main substation MS1 in real time, and the controller CC2 is used to acquire the power information of the main substation MS2 in real time;

The controller CC1 and the controller CC2 respectively control the power conversion device PCD1 and the power conversion device PCD2 to utilize the ride-through power according to the information exchange result, so that the ride-through power returned to the grid from the main substation MS1 or from the main substation MS2 meets the preset requirements. Here, meeting the preset requirements may mean that the ride-through power returned from the main substation MS1 to the power grid or the ride-through power returned to the power grid from the main substation MS2 is controlled within a certain range, or it may mean that the ride-through power from the main substation MS2 is controlled within a certain range. The ride-through power of the main substation MS1 returning to the grid or the ride-through power returning to the grid from the main substation MS2 is zero. In addition, the three-phase bilateral cable TCa, the three-phase bilateral cable TC and the three-phase bilateral cable TCb in the left adjacent power supply section are connected to the traction network TN through one or more three-phase traction transformers. In Figure 1, It is indicated by transformers T1, T2, ..., Ti, ..., Tn, n≥3.

In the application scenario of this embodiment, the three-phase bilateral cable TC is used for bilateral power supply between the main substation MS1 and the main substation MS2. At the same time, the Chinese patent 1 and the Chinese patent 2 mentioned in the background technology need to be used in traction The secondary side of the traction transformer of the substation is connected in series with a reactor to reduce the balanced current, or a voltage compensation device is added in the traction substation to realize voltage phase compensation to reduce the output voltage difference between the two traction substations with bilateral power supply. The two measures are not mandatory, that is, the two measures may or may not be used in this embodiment. The core of this embodiment is to measure the ride-through power or the power returned to the substation with ride-through power. For utilization, the focus is on the processing after the occurrence of ride-through power, rather than suppressing the generation of ride-through power. This is another difference between this embodiment, which is applied to three-phase power supply, which is different from dealing with ride-through power in the prior art. The key idea is that, in addition, on the basis of the technical idea of using the ride-through power in this embodiment, since the regenerative power generated during the train braking may return to the substation together with the ride-through power originally existing in the actual working condition, therefore, The use of ride-through power in this embodiment may also refer to the use of the power of the return substation containing ride-through power. The ride-through power returned to the power grid by the power station MS2 meets the preset requirements, thereby eliminating the negative impact of ride-through power on the power grid and users, and making full use of the advantages of bilateral power supply. In addition, the traction network TN in this implementation provides electric power to the train through the three-phase contact current receiving means that the train uses a three-phase current receiving device to receive power from the traction network TN. For the three-phase current receiving device, please refer to the application of the inventor team. related patented technical solutions.

Preferably, the main substation MS1 in this implementation adopts three-phase power supply, the primary side of the main substation MS1 is connected to the three-phase power grid, the secondary side is connected to the three-phase busbar MB1, and the three-phase busbar MB1 passes through the three-phase feeders Fa1, Feeder Fb1 and feeder Fc1 supply power to the three-phase bilateral cable TC, and the three-phase bus MB1 supplies power to the three-phase bilateral cable TCa in the left adjacent power supply section through the three-phase feeder Fd1, feeder Fe1 and feeder Ff1 respectively, and the three-phase bilateral cable TCa in the left adjacent power supply section The cable TCa supplies power to the traction network TN via one or more transformers.

Preferably, in this embodiment, the main substation MS2 adopts three-phase power supply, the primary side of the main substation MS2 is connected to the three-phase power grid, the secondary side is connected to the three-phase busbar MB2, and the three-phase busbar MB2 passes through the three-phase feeders Fa2, The feeder Fb2 and the feeder Fc2 supply power to the three-phase bilateral cable TC, and the three-phase bus MB2 supplies power through the three-phase feeder Fd2, the feeder Fe2, and the feeder Ff2, respectively, to the three-phase bilateral cable TCb in the right adjacent power supply section; The phase double-sided cable TCb supplies power to the traction network TN through one or more transformers.

Preferably, as shown in FIG. 3 , the power conversion device PCD1 of this embodiment includes a converter device MPC1, a converter device DPC1, an energy storage device ES1, a positive bus PB1 and a negative bus NB1; the converter MPC1 is a three-phase The converter system, the AC side of which is respectively connected with the three-phase busbar MB1 through the AC port J1; the converter device DPC1 is a three-phase converter system, and its AC side is respectively connected with the busbar a, busbar b, and busbars of the substation power distribution system. The busbar c is three-phase connected; the positive and negative electrodes of the DC side of the converter device MPC1, the converter device DPC1 and the energy storage device ES1 are respectively connected with the corresponding positive electrode busbar PB1 and the negative electrode busbar NB1; the control end of the controller CC1 is connected to The control terminal of the power conversion device PCD1 is connected.

Here, when the ride-through power or the return power including the ride-through power flows to the main substation MS1, the controller CC1 can control the energy storage device ES1 to store the ride-through power or the return power including the ride-through power to the main substation MS1, and also The ride-through power flowing to the main substation MS1 or the return power including the ride-through power can be controlled to flow to the three-phase bus abc of the power distribution system so as to be used by the relevant electrical equipment of the power distribution system, so that the ride-through power from the main substation MS1 back to the grid meets the requirements. Default requirements.

Preferably, as shown in FIG. 4 , the power conversion device PCD2 in this embodiment includes a converter device MPC2, a converter device DPC2, an energy storage device ES2, a positive bus PB2 and a negative bus NB2; the converter MPC2 is a three-phase The converter system, its AC side is respectively connected with the three-phase busbar MB2 through the AC port J2; the converter device DPC2 is a three-phase converter system, and its AC side is respectively connected with the busbar u, busbar v, The busbar w is connected in three phases; the positive and negative electrodes of the DC side of the converter device MPC2, the converter device DPC2 and the energy storage device ES2 are respectively connected with the corresponding positive electrode busbar PB2 and the negative electrode busbar NB2; the control end of the controller CC2 is connected to the The control terminal of the power conversion device PCD2 is connected.

Here, when the ride-through power or the return power including the ride-through power flows to the main substation MS2, the controller CC2 can control the energy storage device ES2 to store the ride-through power flowing to the main substation MS2 or the return power including the ride-through power, and also The ride-through power flowing to the main substation MS2 or the return power including the ride-through power can be controlled to flow to the three-phase busbar u, busbar v, and busbar w of the power distribution system so as to be utilized by the related electrical equipment of the power distribution system, so that the power from the main substation can be controlled. The ride-through power of all MS2 back to the grid meets the preset requirements.

Example 2

As shown in FIG. 5 , this embodiment provides a control method based on the traction grid bilateral power supply ride-through power utilization system provided in Embodiment 1, including:

Step S100: the controller CC1 and the controller CC2 obtain the real-time power information of the main substation MS1 and the main substation MS2 respectively;

Step S200: the controller CC1 and the controller CC2 perform information exchange according to the real-time power information obtained respectively;

Step S300: the controller CC1 controls the power conversion device PCD1 to use the ride-through power according to the information exchange result; or, the controller CC2 controls the power conversion device PCD2 to use the ride-through power according to the information exchange result, so that the ride-through power returned from the main substation MS1 to the grid or The ride-through power returned to the grid from the main substation MS2 meets the preset requirements.

Preferably, both the main substation MS1 and the main substation MS2 use three-phase power supply, and in the method:

The controller CC1 and the controller CC2 obtain the real-time power information of the main substation MS1 and the main substation MS2 respectively, that is, step S100 includes:

The controller CC1 detects in real time the voltage Uabc1 of the three-phase bus MB1, the three-phase feeder Fa1, the current Ia1 of the feeder Fb1 and the feeder Fc1, the current Ib1 and the current Ic1, the three-phase feeder Fd1, the current Id1 of the feeder Fe1 and the feeder Ff1, the current Ie1 and the current Ic1. Current If1; the controller CC1 calculates the active power P1 provided by the main substation MS1 to the three-phase bilateral cable TC according to the voltage Uabc1 of the three-phase bus MB1, the current Ia1, the current Ib1 and the current Ic1 of the three-phase feeder. The voltage Uabc1 of the phase bus MB1, the current Id1, the current Ie1 and the current If1 of the three-phase feeder are used to calculate the active power P1a provided by the main substation MS1 to the three-phase bilateral cable TCa in the left adjacent power supply section;

The controller CC2 obtains the power information of the main substation MS2 in real time, including: the controller CC2 detects the voltage Uabc2 of the three-phase bus MB2 in real time, the three-phase feeder Fa2, the current Ia2 of the feeder Fb2 and the feeder Fc2, the current Ib2 and the current Ic2, the three-phase current Ia2 Current Id2, current Ie2 and current If2 of feeder Fd2, feeder Fe2 and feeder Ff2; the controller CC2 calculates the three-phase bilateral cable TC from the main substation MS2 according to the voltage Uabc2, current Id2, current Ie2 and current If2 of the three-phase bus MB2 Provided active power P2, the controller CC2 calculates the active power P2b provided by the three-phase bilateral cable TCb in the right adjacent power supply section of the main substation MS2 according to the voltage Uabc2, current Id2, current Ie2 and current If2 of the three-phase bus MB2;

Among them, the power of the substation flowing to the three-phase bilateral cable is positive, and the power of the three-phase bilateral cable flowing to the traction substation is negative.

Here, the positive power of the main substation flowing to the three-phase bilateral cable not only means that the power of the main substation MS1 flowing to the three-phase bilateral cable TC or the three-phase bilateral cable TCa in the left adjacent power supply section is positive, but also that the main substation MS1 is positive. The power of MS2 flowing to the three-phase bilateral cable TC or the three-phase bilateral cable TCb in the right adjacent power supply interval is positive; the power flowing to the main substation from the three-phase bilateral cable is negative, not only refers to the three-phase bilateral cable TC or the left adjacent power supply The power of the three-phase bilateral cable TCa flowing to the main substation MS1 in the interval is negative, which also means that the power of the three-phase bilateral cable TC or the three-phase bilateral cable TCb flowing to the main substation MS2 in the right adjacent power supply interval is negative.

Preferably, the controller CC1 and the controller CC2 perform information exchange according to the real-time power information obtained respectively, that is, step S200 includes: the controller CC1 sends the data of the active power P1 and the active power P1a to the controller CC2 to the OFL through the optical fiber, The controller CC2 sends the data of the active power P2 and the active power P2b to the controller CC1 through the optical fiber pair OFL.

Preferably, the controller CC1 controls the power conversion device PCD1 to use the ride-through power according to the information exchange result, and the controller CC2 controls the power conversion device PCD2 to use the ride-through power according to the information exchange result, so that the ride-through power returned from the main substation MS1 to the grid or The ride-through power returned to the power grid from the main substation MS2 meets the preset requirements, that is, step S300 includes:

Step S301: If P1>0 and P2<0, and P1+P2=0, the controller CC1 and the controller CC2 determine that the three-phase bilateral cable TC is no-load; Feeder Fa1, feeder Fb1 and feeder Fc1 flow to three-phase feeder Fa2, feeder Fb2 and feeder Fc2; at this time: if the active power P1≥P2b≥0, the controller CC2 controls the power conversion device PCD2 to the three-phase busbar u of the power distribution system , bus v, bus w to supply power, or make the energy storage device ES2 run in the energy storage state; when the sum of the two powers = P1-P2b, the controller CC1 controls the power conversion device PCD1 to stand by; if the active power P2b≥P1, Then the controller CC2 controls the power conversion device PCD2 to stand by, while the controller CC1 controls the power conversion device PCD1 to stand by;

Step S302: If P2>0 and P1<0, and P1+P2=0, the controller CC1 and the controller CC2 determine that the three-phase bilateral cable TC is no-load, in the formula, P1 and P2 are the ride-through power, and the three-phase double-sided cable TC is no-load. Feeder Fa2, feeder Fb2 and feeder Fc2 flow to the three-phase feeder Fa1, feeder Fb1 and feeder Fc1. At this time: if the active power P2≥P1a≥0, the controller CC1 controls the power conversion device PCD1 to the three-phase busbar a, Bus b and bus c supply power or make the energy storage device ES1 run in the energy storage state; when the sum of the two powers = P2-P1a, the controller CC2 controls the power conversion device PCD2 to stand by; if the active power P1a≥P2, the controller CC1 controls the power conversion device PCD1 to stand by, while the controller CC2 controls the power conversion device PCD2 to stand by;

Step S303: If |P1+P2|>0, and P1>0 and P2>0, the controller CC1 and the controller CC2 determine that the three-phase bilateral cable TC is in the traction condition, then the controller CC1 controls the power conversion device PCD1 to make the storage The energy device ES1 runs in the discharge state, the discharge power of the energy storage device ES1≤P1, and the controller CC2 controls the power conversion device PCD2 to make the energy storage device ES2 run in the discharge state, and the discharge power of the energy storage device ES2≤P2.

Preferably, the controller CC1 controls the power conversion device PCD1 to use the ride-through power according to the information exchange result, and the controller CC2 controls the power conversion device PCD2 to use the ride-through power according to the information exchange result, so that the ride-through power returned from the main substation MS1 to the grid or The ride-through power returned to the power grid from the main substation MS2 meets the preset requirements, that is, step S300 further includes:

Step S304: If P1<0 and P2<0, the controller CC1 and the controller CC2 determine that the three-phase double-sided cable TC is in the braking condition, at this time:

Step S304-1: If P1a<0, the controller CC1 controls the power conversion device PCD1 to supply power to the three-phase bus a, bus b, and bus c of the power distribution system or makes the energy storage device ES1 run in the energy storage state; When the sum=|P1|+|P1a|, if P1a>0 and P1a<|P1|, the controller CC1 controls the power conversion device PCD1 to supply power to the three-phase bus a, bus b, and bus c of the power distribution system; or, Make the energy storage device ES1 run in the energy storage state; when the sum of the two powers = | P1 |-|P1a|; if P1a>0 and P1a≥|P1 |, the controller CC1 controls the power conversion device PCD1 to stand by;

Step S304-2: If P2b<0, the controller CC2 controls the power conversion device PCD2 to supply power to the three-phase bus u, bus v, and bus w of the power distribution system; When the sum of power = |P2|+|P2b|, if P2b>0 and P2b<|P2|, the controller CC2 controls the power conversion device PCD2 to supply power to the three-phase bus u, bus v, and bus w of the power distribution system; Or, make the energy storage device ES2 run in the energy storage state, when the sum of the two powers=|P2|-|P2b|; if P2b>0 and P2b≥|P2|, the controller CC2 controls the power conversion device PCD1 to stand by .

The above are only the preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limitations of the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For those skilled in the art, without departing from the spirit and scope of the present invention, several improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (13)

1. A three-phase power supply ride-through power utilization system is characterized in that: comprising a power conversion device PCD1 and a controller CC1 arranged in the main substation MS1, and the power conversion device PCD1 is connected to the three-phase busbar MB1 through the AC port J1; Also It includes a power conversion device PCD2 and a controller CC2 arranged in the main substation MS2. The power conversion device PCD2 is connected to the three-phase busbar MB2 through the AC port J2; wherein, the secondary sides of the main substation MS1 and MS2 are respectively connected to the three-phase busbar. MB1 and MB2 are connected, the three-phase bus MB1 supplies power to the three-phase bilateral cable TCa and the three-phase bilateral cable TC in the left adjacent power supply section, and the three-phase bus MB2 supplies power to the three-phase bilateral cable TC and the three-phase bilateral cable TCb in the right adjacent power supply section. , the three-phase bilateral cable TCa, the three-phase bilateral cable TC, and the three-phase bilateral cable TCb in the right adjacent power supply section all supply power to the traction network TN; Between the controller CC1 and the controller CC2, the OFL is connected to the OFL through an optical fiber and information exchange is performed; The controller CC1 is used to acquire the power information of the main substation MS1 in real time, and the controller CC2 is used to acquire the power information of the main substation MS2 in real time; The controller CC1 and the controller CC2 respectively control the power conversion device PCD1 and the power conversion device PCD2 according to the information exchange result to use the ride-through power by supplying power to the power distribution system or storing energy, so that the main substation MS1 or the main substation can use the ride-through power. The ride-through power of MS2 back to the grid meets the preset requirements. 2. A kind of three-phase power supply ride-through power utilization system according to claim 1, is characterized in that, described main substation MS1 adopts three-phase power supply, and the primary side of main substation MS1 is connected to three-phase power grid, and three The phase bus MB1 supplies power to the three-phase bilateral cable TC through the three-phase feeder Fa1, feeder Fb1 and feeder Fc1, and the three-phase bus MB1 supplies power to the three-phase bilateral cable TCa through the three-phase feeder Fd1, feeder Fe1 and feeder Ff1 respectively to the left adjacent power supply section . 3. A kind of three-phase power supply ride-through power utilization system according to claim 1, is characterized in that, described main substation MS2 adopts three-phase power supply, and the primary side of main substation MS2 is connected to three-phase power grid, and three The phase bus MB2 supplies power to the three-phase bilateral cable TC through the three-phase feeder Fa2, the feeder Fb2 and the feeder Fc2, and the three-phase bus MB2 supplies power to the three-phase bilateral cable in the adjacent power supply section to the right through the three-phase feeder Fd2, the feeder Fe2 and the feeder Ff2, respectively. TCb powered. 4. A three-phase power supply ride-through power utilization system according to claim 1, wherein the power conversion device PCD1 comprises a converter device MPC1, a converter device DPC1, an energy storage device ES1, a positive bus PB1 and a negative electrode The busbar NB1; the converter device MPC1 is a three-phase converter system, and its AC side is respectively connected to the three-phase busbar MB1 through the AC port J1; the converter device DPC1 is a three-phase converter system, and its AC side is respectively connected with the converter. The three-phase connection of bus a, bus b and bus c of the power distribution system of the power station; the positive and negative electrodes of the DC side of the converter device MPC1, the converter device DPC1 and the energy storage device ES1 are respectively connected with the corresponding positive bus bar PB1 and negative bus bar NB1 is connected; the control end of the controller CC1 is connected with the control end of the power conversion device PCD1. 5. A three-phase power supply ride-through power utilization system according to claim 1, wherein the power conversion device PCD2 comprises a converter device MPC2, a converter device DPC2, an energy storage device ES2, a positive bus PB2 and a negative electrode The busbar NB2; the converter device MPC2 is a three-phase converter system, and its AC side is respectively connected to the three-phase busbar MB2 through the AC port J2; the converter device DPC2 is a three-phase converter system, and its AC side is respectively connected with the converter. The busbar u, busbar v, and busbar w of the power distribution system are connected in three phases; the positive and negative electrodes of the DC side of the converter device MPC2, the converter device DPC2 and the energy storage device ES2 are respectively connected with the corresponding positive electrode busbar PB2 and negative electrode busbar NB2 is connected; the control end of the controller CC2 is connected with the control end of the power conversion device PCD2. 6. A three-phase power supply ride-through power utilization system according to claim 2, characterized in that, three-phase busbar MB1 is respectively provided with voltage transformer Ya1, voltage transformer Yb1 and voltage transformer Yc1; three-phase feeder Fa1, feeder Fb1 and feeder Fc1 are respectively provided with current transformer La1, current transformer Lb1 and current transformer Lc1; three-phase feeder Fd1, feeder Fe1 and feeder Ff1 are respectively provided with current transformer Ld1, current transformer Le1 and current transformer Lf1; The voltage transformer Ya1, voltage transformer Yb1, voltage transformer Yc1, current transformer La1, current transformer Lb1, current transformer Lc1, and the measurement terminals of current transformer Ld1, current transformer Le1 and current transformer Lf1 are all Connect to the input of the controller CC1. 7. A kind of three-phase power supply ride-through power utilization system according to claim 3, is characterized in that, three-phase busbar MB2 is respectively provided with voltage transformer Ya2, voltage transformer Yb2 and voltage transformer Yc2; three-phase feeder Fa2, feeder Fb2 and feeder Fc2 are respectively provided with current transformer La2, current transformer Lb2 and current transformer Lc2, and three-phase feeder Fd2, feeder Fe2 and feeder Ff2 are respectively provided with current transformer Ld2, current transformer Le2 and current transformer Lf2; The voltage transformer Ya2, voltage transformer Yb2, voltage transformer Yc2, current transformer La2, current transformer Lb2, current transformer Lc2, and the measurement terminals of current transformer Ld2, current transformer Le2 and current transformer Lf2 are all Connect to the input of the controller CC2. 8. a three-phase power supply ride-through power utilization system according to any one of claims 1-7, is characterized in that, the left adjacent power supply interval three-phase bilateral cable TCa supplies power to the traction network TN through one or more transformers, The three-phase bilateral cable TCb in the right adjacent power supply section supplies power to the traction network TN through one or more transformers. The three-phase bilateral cable TC is connected to the traction network TN through one or more three-phase traction transformers. Power is supplied to the train by the flow. 9. A control method based on the three-phase power supply ride-through power utilization system according to any one of claims 1-8, characterized in that, comprising: The controller CC1 and the controller CC2 obtain the real-time power information of the main substation MS1 and the main substation MS2 respectively; The controller CC1 and the controller CC2 perform information exchange according to the real-time power information obtained by them; The controller CC1 controls the power conversion device PCD1 to utilize the ride-through power according to the information exchange result; Alternatively, the controller CC2 controls the power conversion device PCD2 to use the ride-through power according to the information exchange result, so that the ride-through power returned from the main substation MS1 to the grid or the ride-through power returned from the main substation MS2 to the grid meets the preset requirements. 10. The control method according to claim 9, characterized in that: the main substation MS1 and the main substation MS2 both adopt three-phase power supply, wherein: the controller CC1 acquires the data of the main substation MS1 in real time. The power information includes: the controller CC1 detects the voltage Uabc1 of the three-phase bus MB1 of the main substation MS1 in real time, the current Ia1 of the three-phase feeder Fa1, the feeder Fb1 and the feeder Fc1, the current Ib1 and the current Ic1, the three-phase feeder Fd1, and the feeder Fe1. And the current Id1, current Ie1 and current If1 of the feeder Ff1; the controller CC1 calculates the voltage Uabc1 of the three-phase bus MB1, the current Ia1, the current Ib1 and the current Ic1 of the three-phase feeder. The main substation MS1 provides the three-phase bilateral cable TC. The active power P1, the controller CC1 calculates the active power provided by the three-phase bilateral cable TCa from the main substation MS1 to the left adjacent power supply section according to the voltage Uabc1 of the three-phase bus MB1, the current Id1, the current Ie1 and the current If1 of the three-phase feeder P1a; The real-time acquisition of the power information of the main substation MS2 by the controller CC2 includes: the controller CC2 detects in real time the voltage Uabc2 of the three-phase bus MB2 of the main substation MS2, the three-phase feeder Fa2, the feeder Fb2 and the current Ia2 of the feeder Fc2, Current Ib2 and current Ic2, three-phase feeder Fd2, current Id2, current Ie2 and current If2 of feeder Fe2 and feeder Ff2; the controller CC2 calculates the main substation according to the voltage Uabc2, current Id2, current Ie2 and current If2 of the three-phase bus MB2 The active power P2 provided by the station MS2 to the three-phase bilateral cable TC, the controller CC2 calculates the three-phase bilateral cable in the adjacent power supply section to the right of the main substation MS2 according to the voltage Uabc2, current Id2, current Ie2 and current If2 of the three-phase bus MB2 Active power P2b provided by TCb; Among them, the power flowing from the substation to the three-phase bilateral cable is positive, and the power flowing from the three-phase bilateral cable to the traction substation is negative. 11. The control method according to claim 10, wherein the information exchange between the controller CC1 and the controller CC2 according to the real-time power information obtained respectively comprises: the controller CC1 converts the active power P1 and the active power to the OFL through an optical fiber. The data of the power P1a is sent to the controller CC2, and the controller CC2 sends the data of the active power P2 and the active power P2b to the controller CC1 through the optical fiber pair OFL. 12. The control method according to claim 10 or 11, wherein the controller CC1 controls the power conversion device PCD1 to use ride-through power according to the information exchange result, and the controller CC2 controls the power conversion device PCD2 to use the ride-through power according to the information exchange result. power, so that the ride-through power from the main substation MS1 back to the grid or the ride-through power from the main substation MS2 back to the grid meets the preset requirements, including: If P1>0 and P2<0, and P1+P2=0, the controller CC1 and the controller CC2 determine that the three-phase bilateral cable TC is no-load; in the formula, P1 and P2 are the ride-through power, and the three-phase feeder Fa1, Feeder Fb1 and feeder Fc1 flow to three-phase feeder Fa2, feeder Fb2 and feeder Fc2; at this time: if the active power P1≥P2b≥0, the controller CC2 controls the power conversion device PCD2 to the three-phase busbar u, busbar v of the power distribution system , bus w power supply, or make the energy storage device ES2 run in the energy storage state; when the power supply to the three-phase bus u, v, w of the power distribution system and the power of the energy storage device ES2 = P1-P2b, the controller CC1 Control the power conversion device PCD1 to stand by; if the active power P2b ≥ P1, the controller CC2 controls the power conversion device PCD2 to stand by, while the controller CC1 controls the power conversion device PCD1 to stand by; If P2>0 and P1<0, and P1+P2=0, the controller CC1 and the controller CC2 determine that the three-phase bilateral cable TC is no-load, in the formula, P1 and P2 are the ride-through power, and the three-phase feeder Fa2, Feeder Fb2 and feeder Fc2 flow to the three-phase feeder Fa1, feeder Fb1 and feeder Fc1. At this time: if the active power P2≥P1a≥0, the controller CC1 controls the power conversion device PCD1 to the three-phase bus a, bus b, The busbar c supplies power or makes the energy storage device ES1 run in the energy storage state; when the power supply to the three-phase busbars a, b, and c of the power distribution system and the power of the energy storage device ES1 = P2-P1a, the controller CC2 controls the power conversion The device PCD2 is on standby; if the active power P1a≥P2, the controller CC1 controls the power conversion device PCD1 to stand by, while the controller CC2 controls the power conversion device PCD2 to stand by; If |P1+P2|>0, and P1>0 and P2>0, the controller CC1 and the controller CC2 determine that the three-phase bilateral cable TC is in the traction condition, then the controller CC1 controls the power conversion device PCD1 to make the energy storage device ES1 When running in the discharge state, the discharge power of the energy storage device ES1≤P1, and the controller CC2 controls the power conversion device PCD2 to make the energy storage device ES2 run in the discharge state, and the discharge power of the energy storage device ES2≤P2. 13. The control method according to claim 10 or 11, wherein the controller CC1 controls the power conversion device PCD1 to use ride-through power according to the information exchange result, and the controller CC2 controls the power conversion device PCD2 to use the ride-through power according to the information exchange result. power, so that the ride-through power from the main substation MS1 back to the grid or the ride-through power from the main substation MS2 back to the grid meets the preset requirements, including: If P1 < 0 and P2 < 0, the controller CC1 and the controller CC2 determine that the three-phase bilateral cable TC is in the braking condition. At this time: if P1a < 0, the controller CC1 controls the power conversion device PCD1 to the power distribution system three. Phase bus a, bus b, bus c supply power or make the energy storage device ES1 run in the energy storage state, supply power to the three-phase bus a, b, c of the power distribution system and the power of the energy storage device ES1 =|P1|+| P1a|; if P1a>0 and P1a<|P1|, the controller CC1 controls the power conversion device PCD1 to supply power to the three-phase bus a, bus b and bus c of the power distribution system or makes the energy storage device ES1 run in the energy storage state, The sum of the power supplied to the three-phase buses a, b, and c of the power distribution system and the power of the energy storage device ES1 = | P1 |-|P1a|; if P1a>0 and P1a≥|P1 |, the controller CC1 controls the power conversion device PCD1 standby; If P2b<0, the controller CC2 controls the power conversion device PCD2 to supply power to the three-phase busbar u, busbar v, and busbar w of the power distribution system or makes the energy storage device ES2 run in the energy storage state, and sends power to the three-phase busbar u, busbar u, busbar w of the power distribution system. The sum of the power of v, w power supply and energy storage device ES2 = |P2|+|P2b |; if P2b>0 and P2b<|P2|, the controller CC2 controls the power conversion device PCD2 to send the power conversion system to the three-phase bus u of the power distribution system , busbar v, busbar w supply power or make the energy storage device ES2 run in the energy storage state, supply power to the three-phase busbars u, v, w of the power distribution system and the power of the energy storage device ES2 = | P2 |-|P2b|; If P2b>0 and P2b≥|P2|, the controller CC2 controls the power conversion device PCD1 to stand by.

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