CN111509830A - Topological structure of miniature photovoltaic/energy storage intelligent power station - Google Patents

Abstract

The invention discloses a topological structure of a miniature photovoltaic/energy storage intelligent power station, which comprises a hybrid power unit and a secondary power conversion unit, and provides a three-phase 380V-10 kV adjustable power frequency (50Hz/60Hz) alternating current high-voltage port, a 400V-1 kV direct current high-voltage port, a 0-400V direct current low-voltage port and a single-phase 0-240V power frequency (50Hz/60Hz) alternating current low-voltage port. The hybrid power unit comprises a photovoltaic power generation subunit, a battery energy storage subunit and a power compensation subunit. The micro photovoltaic/energy storage intelligent power station can assist the frequency modulation and voltage regulation of the power distribution network, can provide high-quality voltage sources for various alternating current and direct current loads which are not more than 50kW at most, can realize high-level output, can be connected to a medium-voltage power distribution network without a power frequency transformer, and can ensure the quality of grid-connected current by using smaller filter inductance. The hybrid power unit provided by the invention is easy to modularly expand, so that the hybrid power unit can be suitable for occasions with higher voltage level and higher power.

Description

A miniature photovoltaic/energy storage smart power station topology

technical field

The invention belongs to the field of distributed integrated power supply system and its energy management strategy, new energy power generation, power electronic converter and its advanced control, in particular to a miniature photovoltaic/energy storage intelligent power station topology structure.

Background technique

The distributed integrated energy system is an energy system that effectively and reliably connects power generation, energy storage, and electricity consumption through a specific topology network and terminal power equipment. With the proposal of the concept of global energy internet, various types, forms and scales of distributed integrated energy systems are developing rapidly. The modularization technology of power electronic converters not only enriches the circuit forms of various types of distributed energy sources into the grid, but also improves the power density and operating efficiency of distributed energy resources interconnection/grid-connected systems. This patent proposes a micro-photovoltaic/energy storage smart power station topology structure based on power electronic converters, which provides distributed photovoltaic power generation, battery energy storage, power supply for various low-voltage loads, and a high-power Density of topological connections. This patent also proposes an AC-DC linkage energy management strategy, which ensures the distributed autonomous operation of each unit, and improves the operation efficiency and flexibility.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a topological structure of a miniature photovoltaic/energy storage smart power station.

The technical solution to achieve the purpose of the present invention is: a micro-photovoltaic/energy storage smart power station topology structure, which is characterized in that it includes three phases a, b and c with identical structures, and each phase includes N hybrid power units, DC Bus, DAB output filter;

N hybrid power units are connected in sequence through compensation switches, the DC output terminal of each hybrid power unit is connected to the DC bus, and the DC bus is respectively connected to the DAB output filter a10, the DAB output filter and the input terminal of the output DC/AC structure, The AC voltage output terminal of each phase hybrid power unit is connected to the high-voltage AC side, and the AC voltage neutral point output terminal of each phase hybrid power unit is connected to a point O.

Preferably, each hybrid power unit includes a photovoltaic power generation sub-unit, a power compensation sub-unit, a battery energy storage sub-unit and a compensation switch;

The positive and negative electrodes of the DC output side of the photovoltaic power generation unit are respectively connected with the positive and negative electrodes of the DC input side of the power compensation sub-unit, and the positive and negative electrodes of the DC output side of the photovoltaic power generation unit are connected to the DC of the battery energy storage sub-unit through the compensation switch. The positive pole of the output side is connected, and one end of the AC output side of the photovoltaic power generation subunit is connected to one end of the AC output side of the battery energy storage subunit.

Preferably, the photovoltaic power generation unit includes an H bridge, an electrolytic capacitor C _p1 , a double active bridge, an electrolytic capacitor C _p2 and a solar photovoltaic panel;

The positive and negative electrodes of the H-bridge are respectively connected to the positive and negative electrodes of the electrolytic capacitor C _p1 , and the positive and negative electrodes of the electrolytic capacitor C _p1 are respectively connected to the positive and negative electrodes of the DC output side of the dual active bridge. The positive and negative electrodes of the DC input side of the dual active bridges of the source bridge are respectively connected to the positive and negative electrodes of the electrolytic capacitor C _p2 , and the positive and negative electrodes of the electrolytic capacitor C _p2 are respectively connected to the positive and negative electrodes of the solar photovoltaic panel port voltage.

Preferably, the dual active bridge includes 8 switch tubes S _p5 to S _p12 , a high-frequency inductor L _p1 , a primary coil L _p2 and a secondary coil L _p3 ;

The source of the switch S _p5 is connected to the drain of the switch _Sp6 , the source of the switch _{Sp7 is connected to the drain of the switch Sp8 ,} and one end of the high-frequency inductor L _p1 is connected to the source of the switch _Sp5 , the other end of the high-frequency inductor L _p1 is connected to one end of the primary coil L _p2 , the other end of the primary coil L _p2 is connected to the source of the switch S _p7 , the source of the switch S _p9 and the switch S The drain of _p10 is connected, the source of the switch S _p11 is connected to the drain of the switch S _p12 , one end of the secondary coil L _p3 is connected to the source of the switch _Sp9 , and the other end of the secondary coil L _p3 is connected to the switch The source of the transistor _Sp11 is connected, the drain of the switch _Sp9 is connected to the drain of the switch _Sp11 , the source of the switch _Sp10 is connected to the source of the switch _Sp12 , and the drain of the switch _Sp5 is connected to the drain of the switch Sp11. The source electrodes of the switch transistor _Sp6 are respectively used as dual active bridges, and the drain electrodes of the switch transistor _Sp11 and the source electrodes of the switch transistor _Sp12 are respectively used as the positive and negative electrodes of the DC input side of the dual active bridge.

Preferably, the power compensation subunit includes a dual active bridge and an electrolytic capacitor C _d1 , and the positive and negative electrodes of the DC output side of the dual active bridge are respectively connected to the positive and negative electrodes of the electrolytic capacitor C _d1 .

Preferably, the battery energy storage subunit includes an H bridge, an electrolytic capacitor C _b1 , a double active bridge, an electrolytic capacitor C _b2 and a battery;

The positive and negative electrodes of the H-bridge are respectively connected to the positive and negative electrodes of the electrolytic capacitor C _b1 , and the positive and negative electrodes of the electrolytic capacitor C _b1 are respectively connected to the positive and negative electrodes of the DC output side of the dual active bridge. The positive and negative electrodes of the DC input side of the dual active bridges are respectively connected to the positive and negative electrodes of the electrolytic capacitor C _b2 , and the positive and negative electrodes of the electrolytic capacitor C _b2 are respectively connected to the positive and negative electrodes of the battery port voltage.

Preferably, the DAB output filter is a dual active bridge, including switch tubes S _i1 to S _i8 , a high-frequency inductor L _i1 , a primary coil L _i2 , and a secondary coil L _i3 ;

The source of the switch S _i1 is connected to the drain of the switch S _i2 , the source of the switch S _i2 is connected to the source of the switch S _i4 , and the drain of the switch S i4 is connected to the switch S _i4 The source of S _i3 is connected, the drain of the switch S _i3 is connected to the drain of the switch S _i1 , the source of the switch S _i5 is connected to the drain of the switch S _i6 , and the switch S The source of _i6 is connected to the source of the switch S _i8 , the drain of the switch S _i8 is connected to the source of the switch S _i7 , and the drain of the switch S _i7 is connected to the drain of the switch S _i5 connection, the connection point between the source of the switch S _i1 and the drain of the switch S _i2 is connected to one end of the high-frequency inductor L _i1 , and the other end of the high-frequency inductor L _i1 is connected to one end of the primary coil L _i2 , The other end of the primary coil L _i2 is connected to the connection point between the source of the switch S _i3 and the drain of the switch S _i4 , and one end of the secondary coil L _i3 is connected to the source of the switch S _i5 and the switch S. The connection point of the drain of _i6 is connected, the other end of the secondary coil L _i3 is connected to the connection point of the source of the switch S _i7 and the drain of the switch S _i8 , and the drain of the switch S _i1 of the switch is connected to the DC The positive pole of the bus is connected, and the source of the switch tube S _i2 is connected to the negative pole of the DC bus.

Preferably, the DAB output filter is a dual active bridge, including switch tubes S _k1 to S _k8 , a high-frequency inductor L _k1 , a primary coil L _k2 and a secondary coil L _k3 ;

The source of the switch S _k1 is connected to the drain of the switch S _k2 , the source of the switch S _k2 is connected to the source of the switch S _k4 , and the drain of the switch S k4 is connected to the switch S _k4 The source of S _k3 is connected, the drain of the switch S _k3 is connected to the drain of the switch S _k1 , the source of the switch S _k5 is connected to the drain of the switch S _k6 , and the switch S The source of _k6 is connected to the source of the switch S _k8 , the drain of the switch S _k8 is connected to the source of the switch S _k7 , and the drain of the switch S _k7 is connected to the drain of the switch S _k5 The connection point between the source of the switch tube S _k1 and the drain of the switch tube S _k2 is connected to one end of the high-frequency inductor L _k1 , and the other end of the high-frequency inductor L _k1 is connected to one end of the primary coil L _k2 , The other end of the primary coil L _k2 is connected to the connection point between the source of the switch S _k3 and the drain of the switch S _k4 , and one end of the secondary coil L _k3 is connected to the source of the switch S _k5 and the switch S The connection point of the drain of _k6 is connected, the other end of the secondary coil L _k3 is connected to the connection point of the source of the switch S _k7 and the drain of the switch S _k8 , and the drain of the switch S _k1 of the switch is connected to the DC The positive pole of the bus is connected, and the source of the switch tube S _k2 is connected to the negative pole of the DC bus.

Preferably, the output DC/AC structure includes n H bridges, n−1 compensation switches and n electrolytic capacitors C ₁ ˜C _n ;

The positive and negative electrodes of the n H bridges are respectively connected with the positive and negative electrodes of the n electrolytic capacitors C ₁ to C _n , the positive electrode of the N th electrolytic capacitor is connected to the negative electrode of the N-1 th electrolytic capacitor through a compensation switch, and the One AC output terminal of the N H-bridges is connected to the other output terminal of the N-1th H-bridge.

Preferably, the implementation manner of the compensation switch is a bidirectional switch composed of two MOSFETs or IGBTs connected in series.

Compared with the prior art, the present invention has significant advantages as follows: the micro photovoltaic/storage smart power station of the present invention can not only assist the frequency regulation and voltage regulation of the distribution network, but also provide high-quality voltage sources for various AC and DC loads. The micro photovoltaic/energy storage smart power station of the invention can realize high-level output, can be connected to the medium-voltage distribution network without a power frequency transformer, and can ensure the quality of the grid-connected current by using a small filter inductance. The hybrid power unit proposed by the present invention is easy to be modularized and expanded, so it can be applied to the occasions of higher voltage level and higher power.

The present invention will be described in further detail below with reference to the accompanying drawings.

Description of drawings

Figure 1 shows the topology of a miniature photovoltaic/storage smart power station.

Figure 2 is a block diagram of the control of the photovoltaic power generation unit of a micro photovoltaic/storage smart power station topology structure.

Figure 3 is a block diagram of the battery energy storage sub-unit control of a micro photovoltaic/energy storage smart power station topology.

Figure 4 is a block diagram of a micro photovoltaic/energy storage smart power station topology compensation switch control.

Figure 5 is a block diagram of the power compensation sub-unit control of a micro photovoltaic/storage smart power station topology.

FIG. 6 is a block diagram of the control of H-bridge a1 and H-bridge a6 of a miniature photovoltaic/energy storage smart power station topology.

FIG. 7 is a schematic diagram of a photovoltaic power generation unit of a micro photovoltaic/energy storage smart power station topology.

Fig. 8 is a schematic diagram of a power compensation sub-unit of a micro photovoltaic/energy storage smart power station topology.

FIG. 9 is a schematic diagram of a battery energy storage sub-unit of a miniature photovoltaic/energy storage smart power station topology.

Fig. 10 is a schematic diagram of a compensation switch of a miniature photovoltaic/energy storage smart power station topology.

FIG. 11 is a schematic diagram of an output DC/AC structure a12 of a micro photovoltaic/energy storage smart power station topology.

Detailed ways

In order to more clearly describe the ideas, technical solutions and advantages of the present invention, the specific embodiments are illustrated by the embodiments and the accompanying drawings. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figure 1, a micro-photovoltaic/energy storage smart power station topology includes three phases a, b and c with identical structures, and each phase contains N hybrid power units (1,...,N), DC bus (a9), DAB output filter (a10, a11) and output DC/AC structure (a12);

N hybrid power units (1,...,N) are connected in sequence through compensation switches, and the DC output terminal of each hybrid power unit (1,...,N) is connected to the DC bus (a9), and the DC bus is respectively connected to The DAB output filter a10, the DAB output filter (a11) is connected to the input end of the output DC/AC structure (a12), and the AC voltage neutral output end of each phase hybrid power unit (1) is connected to a point O.

In a further embodiment, as shown in FIG. 1 , each hybrid power unit includes a photovoltaic power generation unit, a power compensation subunit, a battery energy storage subunit, and a compensation switch (a4);

The positive and negative electrodes of the DC output side of the photovoltaic power generation unit are respectively connected with the positive and negative electrodes of the DC input side of the power compensation sub-unit, and the positive and negative electrodes of the DC output side of the photovoltaic power generation unit are connected to the battery energy storage sub-unit through the compensation switch (a4). The positive pole of the DC output side of the unit is connected, and one end of the AC output side of the photovoltaic power generation subunit is connected to one end of the AC output side of the battery energy storage subunit.

In a further embodiment, as shown in FIG. 7 , the photovoltaic power generation unit includes an H bridge (a1), an electrolytic capacitor C _p1 , a double active bridge (a2), an electrolytic capacitor C _p2 and a solar photovoltaic panel (a3);

The positive and negative electrodes of the H bridge (a1) are respectively connected with the positive and negative electrodes of the electrolytic capacitor C _p1 , and the positive and negative electrodes of the electrolytic capacitor C _p1 are respectively connected with the positive and negative electrodes of the DC output side of the double active bridge (a2). The positive and negative electrodes of the DC input side of the double active bridge (a2) are respectively connected with the positive and negative electrodes of the electrolytic capacitor C _p2 , and the positive and negative electrodes of the electrolytic capacitor C _p2 are respectively connected with the solar photovoltaic panel ( a3) The positive and negative poles of the port voltage are connected.

In a further embodiment, as shown in FIG. 7 , the dual active bridge (a2) includes 8 switch tubes S _p5 to S _p12 , a high-frequency inductor L _p1 , a primary coil L _p2 and a secondary coil L _p3 ;

The source of the switch S _p5 is connected to the drain of the switch _Sp6 , the source of the switch _{Sp7 is connected to the drain of the switch Sp8 ,} and one end of the high-frequency inductor L _p1 is connected to the source of the switch _Sp5 , the other end of the high-frequency inductor L _p1 is connected to one end of the primary coil L _p2 , the other end of the primary coil L _p2 is connected to the source of the switch S _p7 , the source of the switch S _p9 and the switch S The drain of _p10 is connected, the source of the switch S _p11 is connected to the drain of the switch S _p12 , one end of the secondary coil L _p3 is connected to the source of the switch _Sp9 , and the other end of the secondary coil L _p3 is connected to the switch The source of the transistor _Sp11 is connected, the drain of the switch _Sp9 is connected to the drain of the switch _Sp11 , the source of the switch _Sp10 is connected to the source of the switch _Sp12 , and the drain of the switch _Sp5 is connected to the drain of the switch Sp11. The source of the switch _Sp6 is used as the double active bridge (a2) respectively, the drain of the switch _Sp11 and the source of the switch _Sp12 are respectively used as the positive and negative poles of the DC input side of the double active bridge (a2).

In a further embodiment, as shown in FIG. 8 , the power compensation subunit includes a dual active bridge (a5) and an electrolytic capacitor C _d1 , and the positive and negative electrodes of the DC output side of the dual active bridge (a5) are respectively Connect to the positive and negative poles of the electrolytic capacitor C _d1 .

In a further embodiment, as shown in FIG. 9 , the battery energy storage subunit includes an H bridge (a6), an electrolytic capacitor C _b1 , a double active bridge (a7), an electrolytic capacitor C _b2 and a battery (a8);

The positive and negative electrodes of the H bridge (a6) are respectively connected with the positive and negative electrodes of the electrolytic capacitor C _b1 , and the positive and negative electrodes of the electrolytic capacitor C _b1 are respectively connected with the positive and negative electrodes of the DC output side of the dual active bridge (a7). , the positive and negative electrodes of the DC input side of the double active bridge (a7) are respectively connected with the positive and negative electrodes of the electrolytic capacitor C _b2 , and the positive and negative electrodes of the electrolytic capacitor C _b2 are respectively connected with the battery (a8). ) The positive and negative poles of the terminal voltage are connected.

In a further embodiment, the DAB output filter (a10) is a dual active bridge, including switch tubes S _i1 to S _i8 , a high-frequency inductor L _i1 , a primary coil L _i2 , and a secondary coil L _i3 ;

The source of the switch S _i1 is connected to the drain of the switch S _i2 , the source of the switch S _i2 is connected to the source of the switch S _i4 , and the drain of the switch S i4 is connected to the switch S _i4 The source of S _i3 is connected, the drain of the switch S _i3 is connected to the drain of the switch S _i1 , the source of the switch S _i5 is connected to the drain of the switch S _i6 , and the switch S The source of _i6 is connected to the source of the switch S _i8 , the drain of the switch S _i8 is connected to the source of the switch S _i7 , and the drain of the switch S _i7 is connected to the drain of the switch S _i5 connection, the connection point between the source of the switch S _i1 and the drain of the switch S _i2 is connected to one end of the high-frequency inductor L _i1 , and the other end of the high-frequency inductor L _i1 is connected to one end of the primary coil L _i2 , The other end of the primary coil L _i2 is connected to the connection point between the source of the switch S _i3 and the drain of the switch S _i4 , and one end of the secondary coil L _i3 is connected to the source of the switch S _i5 and the switch S. The connection point of the drain of _i6 is connected, the other end of the secondary coil L _i3 is connected to the connection point of the source of the switch S _i7 and the drain of the switch S _i8 , and the drain of the switch S _i1 of the switch is connected to the DC The positive electrode of the bus bar (a9) is connected, and the source electrode of the switch tube S _i2 is connected to the negative electrode of the DC bus bar (a9).

In a further embodiment, the DAB output filter (a11) is a dual active bridge, including switch tubes S _k1 to S _k8 , a high-frequency inductor L _k1 , a primary coil L _k2 and a secondary coil L _k3 ;

The source of the switch S _k1 is connected to the drain of the switch S _k2 , the source of the switch S _k2 is connected to the source of the switch S _k4 , and the drain of the switch S k4 is connected to the switch S _k4 The source of S _k3 is connected, the drain of the switch S _k3 is connected to the drain of the switch S _k1 , the source of the switch S _k5 is connected to the drain of the switch S _k6 , and the switch S The source of _k6 is connected to the source of the switch S _k8 , the drain of the switch S _k8 is connected to the source of the switch S _k7 , and the drain of the switch S _k7 is connected to the drain of the switch S _k5 The connection point between the source of the switch tube S _k1 and the drain of the switch tube S _k2 is connected to one end of the high-frequency inductor L _k1 , and the other end of the high-frequency inductor L _k1 is connected to one end of the primary coil L _k2 , The other end of the primary coil L _k2 is connected to the connection point between the source of the switch S _k3 and the drain of the switch S _k4 , and one end of the secondary coil L _k3 is connected to the source of the switch S _k5 and the switch S The connection point of the drain of _k6 is connected, the other end of the secondary coil L _k3 is connected to the connection point of the source of the switch S _k7 and the drain of the switch S _k8 , and the drain of the switch S _k1 of the switch is connected to the DC The positive pole of the busbar (a9) is connected, and the source of the switch tube _Sk2 is connected to the negative pole of the DC busbar (a9).

In a further embodiment, as shown in FIG. 11 , the output DC/AC structure (a12) includes n H bridges, n−1 compensation switches and n electrolytic capacitors C ₁ ˜C _n ;

The positive and negative poles of the n H bridges are respectively connected with the positive and negative poles of the n electrolytic capacitors C ₁ ˜C _n , and the positive poles of the N (N∈[1,n]) electrolytic capacitors pass through the compensation switch and the N-th electrolytic capacitors. The negative pole of an electrolytic capacitor is connected, and an AC output terminal of the N (N∈[1,n])th H-bridge is connected to the other output terminal of the N-1th H-bridge.

Preferably, as shown in FIG. 10 , the implementation manner of the compensation switch is a bidirectional switch composed of two MOSFETs or IGBTs connected in series.

The working process of the present invention is specifically:

As shown in Figure 6, the control method of the H-bridge a1 and H-bridge a6 switches of each hybrid power unit is as follows: the active power command value P _gref output to the high-voltage AC side a13 is subtracted from the actual active power value P _g , The difference is sent to the power controller to obtain the output signal v _d , the reactive power command value Q _gref output to the high-voltage AC side a13 is subtracted from the actual value of reactive power Q _g , and the difference is sent to the power controller to obtain the output Signals v _q , v _d and v _q are transformed by dq-ab coordinates to obtain the modulated wave signals of H-bridge a1 and H-bridge a6 of each hybrid power unit, which are modulated at high frequency to obtain H-bridge a1 and H-bridge a6 switches The drive pulse signal of the tube. As shown in FIG. 3 , the control method of the switch tube of the battery energy storage sub-unit is: the average command value V _dcref of the voltage v _dc1 of the electrolytic capacitor C _p1 and the voltage v _dc2 of C _b1 and the average actual value (V dcref ) _dc1 +Vd _c2 )/2 to find the difference, the difference and the battery port current i _B get the modulated wave signal of the battery energy storage sub-unit through the voltage controller, the signal is modulated by high frequency to get the drive of the switch tube of the battery energy storage sub-unit Pulse signal. As shown in FIG. 2 , the control method of the photovoltaic power generation unit is: obtaining the charging power P _ch of the battery according to the state of charge (SOC) of the battery and the charging curve of the battery, and combining the charging power P _ch of the battery with the actual power P _B Calculate the difference, the difference is obtained through the proportional integral controller to obtain the optimal voltage increment Δv _mppt across the solar photovoltaic panel, according to the terminal voltage v _pv and terminal current i _pv of the solar photovoltaic panel and the blocking logic LG ₃ (Δv _mppt ≥ 0 When LG ₃ =1, when Δv _mppt <0, LG ₃ =1, if LG ₃ =0, enable MPPT, if LG ₃ =1, disable MPPT) Perform maximum power point tracking (MPPT) for solar photovoltaic panels ), the optimal voltage v _mppt at both ends of the solar photovoltaic panel is obtained, and the optimal voltage increment Δv _mppt at both ends of the solar photovoltaic panel and the optimal voltage v _{mppt are added to obtain the terminal voltage command value v pvref of} the solar photovoltaic panel. After taking the difference between the terminal voltage command value v _pvref of the photovoltaic panel and the actual value v _pv and the solar photovoltaic panel terminal current i _pv voltage controller, the modulated wave signal of the photovoltaic power generation unit is obtained. The signal is modulated by high frequency to obtain the photovoltaic power generation unit. The driving pulse signal of the switch tube. As shown in Figure 4, the control method of each compensation switch is as follows: the difference between the voltages v _dc1 and v _dc2 of the electrolytic capacitors C _p1 and C _b1 is calculated, and the difference is sent to the voltage controller to obtain the voltage of each compensation switch. Modulated wave signal, which is modulated by high frequency to obtain the drive pulse signal of each compensation switch switch tube. As shown in Figure 5, the control method of the power compensation sub-unit is as follows: after calculating the difference between the voltage command value V _O ^* of the DC bus a9 and the actual value V _O , send it to the voltage controller to obtain the modulated wave signal of the power compensation sub-unit Component v _r1 , the difference between the power command value _PO ^* of the DC bus _a9 and the actual value PO is calculated and sent to the power controller to obtain the modulated wave signal component v _r2 of the power compensation sub-unit, and the modulated wave signal of the power compensation sub-unit is calculated. After summation of the components v _r1 and v _r2 , the driving pulse signal of the switch tube of the compensation subunit of each hybrid power unit is obtained after high frequency modulation.

Example

A micro-photovoltaic/energy storage smart power station topology structure, including three-phase a, b and c with the same structure, each phase includes N hybrid power units (1,...,N), a DC bus (a9), DAB output filter (a10, a11) and output DC/AC structure (a12);

N hybrid power units (1,...,N) are connected in sequence through compensation switches, and the DC output terminal of each hybrid power unit (1,...,N) is connected to the DC bus (a9), and the DC bus is respectively connected to The DAB output filter a10, the DAB output filter (a11) is connected to the input end of the output DC/AC structure (a12), the AC voltage output end of each phase hybrid power unit (N) is connected to the high-voltage AC power grid (a13), each The AC voltage neutral point output terminal of the phase hybrid power unit (1) is connected to a point O.

Each hybrid power unit includes a photovoltaic power generation unit, a power compensation subunit, a battery energy storage subunit, and a compensation switch (a4).

The photovoltaic power generation unit includes an H bridge (a1), an electrolytic capacitor C _p1 , a double active bridge (a2) and a solar photovoltaic panel (a3).

The H-bridge (a1) includes 4 switch tubes S _p1 to S _p4 , and the dual active bridge (a2) includes 8 switch tubes S _p5 to S _p12 , a high-frequency inductor L _p1 , a primary coil L _p2 , Secondary coil L _p3 and electrolytic capacitor C _p2 ;

The connection point between the source of the switch S _p1 and the drain of the switch S _p2 is a, b, c three-phase and each-phase AC voltage neutral point output terminal of the hybrid power unit, and the source of the switch S _p2 is connected to the source of the switch tube _Sp4 , the drain of the switch tube _Sp4 is connected to the source of the switch tube _Sp3 , the drain of the switch tube _Sp3 is connected to the drain of the switch tube _Sp1 , and the The drain of the switch tube _{Sp3 is connected to the positive pole of the electrolytic capacitor C p1, the source of the switch tube Sp4 is connected} to the negative pole of the electrolytic capacitor C _p1 , and the positive pole of the electrolytic capacitor C _p1 is connected to the switch tube S _p5 and the switch tube The drain of _Sp7 is connected, the negative electrode of the electrolytic capacitor C _p1 is connected to the source of the switch _Sp6 and the switch _Sp8 , and the connection point between the source of the switch _Sp5 and the drain of the switch _Sp6 is connected to the high One end of the high frequency inductor L _p1 is connected, the other end of the high frequency inductor L _p1 is connected to one end of the primary coil L _p2 , and the other end of the primary coil L _p2 is connected to the source of the switch S _p7 and the switch S _p8 The connection point of the drain is connected, one end of the secondary coil L _p3 is connected to the connection point of the source of the switch S _p9 and the drain of the switch S _p10 , and the other end of the secondary coil L _p3 is connected to the switch S _p11 The source is connected to the connection point of the drain of the switch tube _Sp12 , the positive pole of the electrolytic capacitor C _p2 is connected to the switch tube _{Sp9 and the drain of the switch tube Sp11 ,} and the negative pole of the electrolytic capacitor C _p2 is connected to the switch tube _Sp10 is connected to the source of the switch tube S _p12 , the positive electrode of the electrolytic capacitor C _p2 is connected to the positive electrode of the solar photovoltaic panel, and the negative electrode of the electrolytic capacitor C _p2 is connected to the negative electrode of the solar photovoltaic panel;

The power compensation subunit is a dual active bridge (a5);

The dual active bridge (a5) includes 8 switch tubes S _d1 to S _d8 , a high-frequency inductor L _d1 , a primary coil L _d2 , a secondary coil L _d3 and an electrolytic capacitor C _d1 ;

The drain of the switch S _d1 is connected to the positive electrode of the electrolytic capacitor C _p1 , the source of the switch S _d2 is connected to the negative electrode of the electrolytic capacitor C _p1 , and the source of the switch S _d1 is connected to the switch S _d2 The drain of the switch S _d2 is connected to the source of the switch S _d4 , the drain of the switch S _d4 is connected to the source of the switch S _d3 , the switch S _d3 The drain is connected to the drain of the switch S _d1 , the source of the switch S _d5 is connected to the drain of the switch S _d6 , the source of the switch S _d6 is connected to the source of the switch S _d8 , The drain of the switch S _d8 is connected to the source of the switch S _d7 , the drain of the switch S _d7 is connected to the drain of the switch S _d5 , and the source of the switch S _d1 is connected to the switch S The connection point of the drain of _d2 is connected to one end of the high frequency inductor L _d1 , the other end of the high frequency inductor L _d1 is connected to one end of the primary coil L _d2 , and the other end of the primary coil L _d2 is connected to the switch tube The source of S _d3 is connected to the connection point of the drain of the switch S _d4 , one end of the secondary coil L _d3 is connected to the connection point of the source of the switch S _d5 and the drain of the switch S _d6 , the secondary coil L The other end of _d3 is connected to the connection point between the source of the switch tube S _d7 and the drain of the switch tube S _d8 , and the positive pole of the electrolytic capacitor C _d1 is respectively connected to the drain of the switch tube S _d5 and the switch tube S _d7 and the DC bus (a9 ) is connected to the positive electrode of the electrolytic capacitor C _d1 , and the negative electrode of the electrolytic capacitor C d1 is connected to the source electrode of the switch tube S _d6 and the source electrode of the switch tube S _d8 and the negative electrode of the DC bus (a9);

The battery energy storage subunit includes an H bridge (a6), an electrolytic capacitor C _b1 , a double active bridge (a7) and a solar photovoltaic panel (a8);

The H-bridge (a6) includes four switch tubes S _{b1 ˜S b4} , the dual active bridge (a7) includes 8 switch tubes S _{b5 ˜S b12} , a high-frequency inductor L _b1 , and a primary coil L _b2 , Secondary coil L _b3 and electrolytic capacitor C _b2 ;

The source of the switch _Sb1 is connected to the drain of the switch _Sb2 , the source of the switch _Sb2 is connected to the source of the switch _Sb4 , and the drain of the switch _Sb4 is connected to the switch The source of S _b3 is connected, the drain of the switch S _b3 is connected to the drain of the switch S _b1 , the drain of the switch S _b3 is connected to the positive electrode of the electrolytic capacitor C _b1 , and the switch S _b4 The source of the electrolytic capacitor C _b1 is connected to the negative electrode of the electrolytic capacitor C _b1 , the positive electrode of the electrolytic capacitor C b1 is connected to the drain of the switch tube S _b5 and the switch tube S _b7 , and the negative electrode of the electrolytic capacitor C _b1 is connected to the switch tube S _b6 and the switch tube S b7. The source of the tube S _b8 is connected, the connection point between the source of the switch tube S _b5 and the drain of the switch tube S _b6 is connected to one end of the high-frequency inductor L _b1 , and the other end of the high-frequency inductor L _b1 is connected to the primary coil One end of L _b2 is connected, the other end of the primary coil L _b2 is connected to the connection point between the source of the switch S _b7 and the drain of the switch S _b8 , and one end of the secondary coil L _b3 is connected to the switch S _b9 The source is connected to the connection point of the drain of the switch S _b10 , the other end of the secondary coil L _b3 is connected to the connection point of the source of the switch S _b11 and the drain of the switch S _b12 , and the electrolytic capacitor C _b2 The positive pole is connected to the drain of the switch tube S _b9 and the switch tube S _b11 , the negative pole of the electrolytic capacitor C _b2 is connected to the source pole of the switch tube S _b10 and the switch tube S _b12 , and the positive pole of the electrolytic capacitor C _b2 is connected to the solar photovoltaic The positive electrode of the panel is connected, the negative electrode of the electrolytic capacitor C _b2 is connected to the negative electrode of the solar photovoltaic panel, the connection point between the source electrode of the switch tube S _b1 and the drain electrode of the switch tube S _b2 and the source electrode of the switch tube _Sp3 and The connection point of the drain of the switch tube _Sp4 is connected, the positive pole of the electrolytic capacitor C _p1 is connected to the positive pole of the electrolytic capacitor C _b1 through the compensation switch (a4), and the source of the switch tube S _b3 is connected to the switch tube S _b4 . The drain connection point is the AC voltage output terminal of the a, b, c three-phase hybrid power unit;

The compensation switch (a4) includes switch tubes S _m1 and S _m2 ;

The source of the switch tube S _m1 is connected to the drain of the switch tube S _m2 ;

The connection point between the drain of the switch tube _Sp6 and the source of the switch tube _Sp8 of the three-phase a, b and c hybrid power unit (1) is connected to point O;

The connection point of the drain of the switch S _p3 and the source of the switch S _p4 is connected to the connection point of the drain of the switch S _b3 and the source of the switch S _b4 , and the positive electrode of the electrolytic capacitor C _p1 is connected to the compensation switch (a4) through the compensation switch (a4). The positive electrode of the electrolytic capacitor C _b1 is connected;

The connection point between the source of the switch S _p1 and the drain of the switch S _p2 between the N hybrid power units is connected to the connection point of the source of the switch S _b3 and the drain of the switch S _b4 , and the N hybrid power units The positive electrode of the inter-electrolytic capacitor C _p1 is connected to the positive electrode of the electrolytic capacitor C _b2 through the compensation switch.

The DAB output filter (a10) is a dual active bridge, including switch tubes S _i1 to S _i8 , high-frequency inductor L _i1 , primary coil L _i2 , secondary coil L _i3 and electrolytic capacitor C _i1 ;

The source of the switch S _i1 is connected to the drain of the switch S _i2 , the source of the switch S _i2 is connected to the source of the switch S _i4 , and the drain of the switch S i4 is connected to the switch S _i4 The source of S _i3 is connected, the drain of the switch S _i3 is connected to the drain of the switch S _i1 , the source of the switch S _i5 is connected to the drain of the switch S _i6 , and the switch S The source of _i6 is connected to the source of the switch S _i8 , the drain of the switch S _i8 is connected to the source of the switch S _i7 , and the drain of the switch S _i7 is connected to the drain of the switch S _i5 connection, the connection point between the source of the switch S _i1 and the drain of the switch S _i2 is connected to one end of the high-frequency inductor L _i1 , and the other end of the high-frequency inductor L _i1 is connected to one end of the primary coil L _i2 , The other end of the primary coil L _i2 is connected to the connection point between the source of the switch S _i3 and the drain of the switch S _i4 , and one end of the secondary coil L _i3 is connected to the source of the switch S _i5 and the switch S. The connection point of the drain of _i6 is connected, the other end of the secondary coil L _i3 is connected to the connection point of the source of the switch S _i7 and the drain of the switch S _i8 , and the drain of the switch S _i1 of the switch is connected to the DC The positive pole of the bus (a9) is connected, and the source of the switch tube S _i2 is connected to the negative pole of the DC bus (a9);

The DAB output filter (a10) is a dual active bridge, including switch tubes S _k1 to S _k8 , a high-frequency inductor L _k1 , a primary coil L _k2 , a secondary coil L _k3 and an electrolytic capacitor C _k1 ;

The source of the switch S _k1 is connected to the drain of the switch S _k2 , the source of the switch S _k2 is connected to the source of the switch S _k4 , and the drain of the switch S k4 is connected to the switch S _k4 The source of S _k3 is connected, the drain of the switch S _k3 is connected to the drain of the switch S _k1 , the source of the switch S _k5 is connected to the drain of the switch S _k6 , and the switch S The source of _k6 is connected to the source of the switch S _k8 , the drain of the switch S _k8 is connected to the source of the switch S _k7 , and the drain of the switch S _k7 is connected to the drain of the switch S _k5 The connection point between the source of the switch tube S _k1 and the drain of the switch tube S _k2 is connected to one end of the high-frequency inductor L _k1 , and the other end of the high-frequency inductor L _k1 is connected to one end of the primary coil L _k2 , The other end of the primary coil L _k2 is connected to the connection point between the source of the switch S _k3 and the drain of the switch S _k4 , and one end of the secondary coil L _k3 is connected to the source of the switch S _k5 and the switch S The connection point of the drain of _k6 is connected, the other end of the secondary coil L _k3 is connected to the connection point of the source of the switch S _k7 and the drain of the switch S _k8 , and the drain of the switch S _k1 of the switch is connected to the DC The positive pole of the bus bar (a9) is connected, and the source of the switch tube _Sk2 is connected to the negative pole of the DC bus bar (a9);

The output DC/AC structure (a12) includes n (n=1, 2,...,+∞) H bridges and n-1 compensation switches, and the nth H bridge includes four switch tubes S _{4n- 3} to S _4n , the source _of the switch _S1 is connected to the drain of the switch _S2 , the source of the switch S2 is connected to the source of the switch S4, and the switch S4 is connected to the source of the switch _{S4 .} The drain is connected to the source of the switch S3, the drain _of the switch S3 is connected to the drain _of the switch S1, and the source of the switch _{S4n-3 is} connected to the source of the switch _S4n-2 The drain is connected, the source of the switch S _4n-2 is connected to the source of the switch S _4n , the drain of the switch S _4n is connected to the source of the switch S _4n-1 , the switch S The drain of _4n-1 is connected to the drain of the switch S _4n-3 , the drain of the switch S ₁ is connected to the positive electrode of the electrolytic capacitor C ₁ , and the source of the switch S ₂ is connected to the electrolytic capacitor C ₂ The negative electrode of the switch tube S _4n-3 is connected to the positive electrode of the electrolytic capacitor C _n , the source electrode of the switch tube S _4n-2 is connected to the negative electrode of the electrolytic capacitor C _n , and the electrolytic capacitor C ₁ The positive pole is connected to the positive pole of the DC bus (a9), the negative pole of the electrolytic capacitor C _n is connected to the negative pole of the DC bus (a9), and the positive pole of the nth electrolytic capacitor C _n is connected to the n-1th electrolytic capacitor through the compensation switch. The negative pole of C _n-1 is connected, and the connection point between the drain of the switch _S4n and the source of _S4n-1 is connected to the connection point of the drain of the switch _S4n-6 and the source of _S4n-7 through the compensation switch.

Claims (10)

1. A miniature photovoltaic/energy storage smart power station topology structure, characterized in that it includes three phases a, b and c with identical structures, and each phase includes N hybrid power units (1, . . . , N), DC bus (a9), DAB output filter (a10, a11), output DC/AC structure (a12) and high voltage AC side (a13); N hybrid power units (1,...,N) are connected in sequence through compensation switches, and the DC output terminal of each hybrid power unit (1,...,N) is connected to the DC bus (a9), and the DC bus is respectively connected to DAB output filter a10, DAB output filter (a11) is connected to the input end of the output DC/AC structure (a12), the AC voltage output end of each phase hybrid power unit (N) is connected to the high voltage AC side (a13), each The AC voltage neutral point output terminal of the phase hybrid power unit (1) is connected to a point O. 2. The miniature photovoltaic/energy storage smart power station topology structure according to claim 1, wherein each hybrid power unit comprises a photovoltaic power generation sub-unit, a power compensation sub-unit, a battery energy storage sub-unit and a Compensation switch (a4); The positive and negative electrodes of the DC output side of the photovoltaic power generation unit are respectively connected with the positive and negative electrodes of the DC input side of the power compensation sub-unit, and the positive and negative electrodes of the DC output side of the photovoltaic power generation unit are connected to the battery energy storage sub-unit through the compensation switch (a4). The positive pole of the DC output side of the unit is connected, and one end of the AC output side of the photovoltaic power generation subunit is connected to one end of the AC output side of the battery energy storage subunit. 3. The miniature photovoltaic/energy storage smart power station topology structure according to claim 2, wherein the photovoltaic power generation unit comprises an H bridge (a1), an electrolytic capacitor C _p1 , a double active bridge (a2), an electrolytic capacitor Capacitance C _p2 and solar photovoltaic panel (a3); The positive and negative electrodes of the H bridge (a1) are respectively connected with the positive and negative electrodes of the electrolytic capacitor C _p1 , and the positive and negative electrodes of the electrolytic capacitor C _p1 are respectively connected with the positive and negative electrodes of the DC output side of the double active bridge (a2). The positive and negative electrodes of the DC input side of the double active bridge (a2) are respectively connected with the positive and negative electrodes of the electrolytic capacitor C _p2 , and the positive and negative electrodes of the electrolytic capacitor C _p2 are respectively connected with the solar photovoltaic panel ( a3) The positive and negative poles of the port voltage are connected. 4 . The topology structure of the miniature photovoltaic/energy storage smart power station according to claim 3 , wherein the dual active bridge (a2) comprises 8 switching tubes S _p5 to S _p12 , a high-frequency inductor L _p1 , an original side coil L _p2 and secondary side coil L _p3 ; The source of the switch S _p5 is connected to the drain of the switch _Sp6 , the source of the switch _{Sp7 is connected to the drain of the switch Sp8 ,} and one end of the high-frequency inductor L _p1 is connected to the source of the switch _Sp5 , the other end of the high-frequency inductor L _p1 is connected to one end of the primary coil L _p2 , the other end of the primary coil L _p2 is connected to the source of the switch S _p7 , the source of the switch S _p9 and the switch S The drain of _p10 is connected, the source of the switch S _p11 is connected to the drain of the switch S _p12 , one end of the secondary coil L _p3 is connected to the source of the switch _Sp9 , and the other end of the secondary coil L _p3 is connected to the switch The source of the transistor _Sp11 is connected, the drain of the switch _Sp9 is connected to the drain of the switch _Sp11 , the source of the switch _Sp10 is connected to the source of the switch _Sp12 , and the drain of the switch _Sp5 is connected to the drain of the switch Sp11. The source of the switch _Sp6 is used as the double active bridge (a2) respectively, the drain of the switch _Sp11 and the source of the switch _Sp12 are respectively used as the positive and negative poles of the DC input side of the double active bridge (a2). 5. The miniature photovoltaic/energy storage smart power station topology structure according to claim 2, wherein the power compensation subunit comprises a double active bridge (a5) and an electrolytic capacitor C _d1 , the double active bridge (a5) The positive and negative electrodes of the DC output side of a5) are respectively connected to the positive and negative electrodes of the electrolytic capacitor C _d1 . 6. The miniature photovoltaic/energy storage smart power station topology structure according to claim 2, wherein the battery energy storage subunit comprises an H bridge (a6), an electrolytic capacitor _Cb1 , a dual active bridge (a7), Electrolytic capacitor C _b2 and battery (a8); The positive and negative electrodes of the H bridge (a6) are respectively connected with the positive and negative electrodes of the electrolytic capacitor C _b1 , and the positive and negative electrodes of the electrolytic capacitor C _b1 are respectively connected with the positive and negative electrodes of the DC output side of the dual active bridge (a7). , the positive and negative electrodes of the DC input side of the double active bridge (a7) are respectively connected with the positive and negative electrodes of the electrolytic capacitor C _b2 , and the positive and negative electrodes of the electrolytic capacitor C _b2 are respectively connected with the battery (a8). ) The positive and negative poles of the terminal voltage are connected. 7 . The miniature photovoltaic/energy storage smart power station topology structure according to claim 1 , wherein the DAB output filter ( a10 ) is a dual active bridge, including switch tubes S _i1 to S _i8 , high-frequency inductors. 8 . L _i1 , the primary coil L _i2 , and the secondary coil L _i3 ; The source of the switch S _i1 is connected to the drain of the switch S _i2 , the source of the switch S _i2 is connected to the source of the switch S _i4 , and the drain of the switch S i4 is connected to the switch S _i4 The source of S _i3 is connected, the drain of the switch S _i3 is connected to the drain of the switch S _i1 , the source of the switch S _i5 is connected to the drain of the switch S _i6 , and the switch S The source of _i6 is connected to the source of the switch S _i8 , the drain of the switch S _i8 is connected to the source of the switch S _i7 , and the drain of the switch S _i7 is connected to the drain of the switch S _i5 connection, the connection point between the source of the switch S _i1 and the drain of the switch S _i2 is connected to one end of the high-frequency inductor L _i1 , and the other end of the high-frequency inductor L _i1 is connected to one end of the primary coil L _i2 , The other end of the primary coil L _i2 is connected to the connection point between the source of the switch S _i3 and the drain of the switch S _i4 , and one end of the secondary coil L _i3 is connected to the source of the switch S _i5 and the switch S. The connection point of the drain of _i6 is connected, the other end of the secondary coil L _i3 is connected to the connection point of the source of the switch S _i7 and the drain of the switch S _i8 , and the drain of the switch S _i1 of the switch is connected to the DC The positive electrode of the bus bar (a9) is connected, and the source electrode of the switch tube S _i2 is connected to the negative electrode of the DC bus bar (a9). 8. The miniature photovoltaic/energy storage smart power station topology structure according to claim 1, wherein the DAB output filter (a10) is a dual active bridge, comprising switch tubes S _k1 to S _k8 , high-frequency inductors L _k1 , the primary coil L _k2 and the secondary coil L _k3 ; The source of the switch S _k1 is connected to the drain of the switch S _k2 , the source of the switch S _k2 is connected to the source of the switch S _k4 , and the drain of the switch S k4 is connected to the switch S _k4 The source of S _k3 is connected, the drain of the switch S _k3 is connected to the drain of the switch S _k1 , the source of the switch S _k5 is connected to the drain of the switch S _k6 , and the switch S The source of _k6 is connected to the source of the switch S _k8 , the drain of the switch S _k8 is connected to the source of the switch S _k7 , and the drain of the switch S _k7 is connected to the drain of the switch S _k5 The connection point between the source of the switch tube S _k1 and the drain of the switch tube S _k2 is connected to one end of the high-frequency inductor L _k1 , and the other end of the high-frequency inductor L _k1 is connected to one end of the primary coil L _k2 , The other end of the primary coil L _k2 is connected to the connection point between the source of the switch S _k3 and the drain of the switch S _k4 , and one end of the secondary coil L _k3 is connected to the source of the switch S _k5 and the switch S The connection point of the drain of _k6 is connected, the other end of the secondary coil L _k3 is connected to the connection point of the source of the switch S _k7 and the drain of the switch S _k8 , and the drain of the switch S _k1 of the switch is connected to the DC The positive electrode of the bus bar (a9) is connected, and the source electrode of the switch tube _Sk2 is connected to the negative electrode of the DC bus bar (a9). 9. The miniature photovoltaic/energy storage smart power station topology structure according to claim 1, wherein the output DC/AC structure (a12) comprises n H bridges, n-1 compensation switches and n electrolytic capacitors C ₁ to C _n ; The positive and negative poles of the n H bridges are respectively connected with the positive and negative poles of the n electrolytic capacitors C ₁ ˜C _n , and the positive poles of the N (N∈[1,n]) electrolytic capacitors pass through the compensation switch and the N-th electrolytic capacitors. The negative pole of an electrolytic capacitor is connected, and an AC output terminal of the N (N∈[1,n])th H-bridge is connected to the other output terminal of the N-1th H-bridge. 10 . The topology of the miniature photovoltaic/energy storage smart power station according to claim 9 , wherein the compensation switch is implemented as a bidirectional switch composed of two MOSFETs or IGBTs connected in series. 11 .

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