CN105608245A

CN105608245A - Modeling method of multi-CPU (Central Processing Unit) independent resolution of large-scale power distribution network

Info

Publication number: CN105608245A
Application number: CN201510715162.8A
Authority: CN
Inventors: 何国玉
Original assignee: Guizhou Liaoyuan Electric Technology Co Ltd
Current assignee: Guizhou Liaoyuan Electric Technology Co Ltd
Priority date: 2015-10-29
Filing date: 2015-10-29
Publication date: 2016-05-25

Abstract

The invention discloses a modeling method of the multi-CPU (Central Processing Unit) independent resolution of a large-scale power distribution network, and is used for the real-time simulation of the large-scale power distribution network. A segmentation method based on a power grid physical structure is adopted to segment the large-scale power distribution network into more than two independent power distribution networks under simulation significance, and each independent power distribution network uses a single-CPU simulation system to carry out real-time resolution; and a controlled voltage source and a controlled current source are connected in parallel on a segmentation point, and an Ethernet is used for transmitting real-time data when the real-time variables of the controlled voltage source and a controlled current source are transmitted to an opposite side, and the Ethernet establishes a correct logic connection for the simulation intermediate variables of different areas. The distribution of the calculation tasks of the modeling method is assigned according to the physical structure characteristics of the power distribution network and does not need a cluster to dispatch, each calculation unit still operates according to a stand-alone mode, and the system is operated in real time by a stand-alone version; and through the voltage and current exchange data of two sides of a segmentation surface, the segmentation calculation of the power distribution network is realized, and therefore, the resolution scale of the real-time simulation of the power distribution network is doubled and redoubled.

Description

The modeling method that the extensive many CPU of power distribution network independently resolve

Technical field

The present invention relates to the modeling method of electromagnetic transient in power system real-time simulation, relate to particularly the modeling method that the many CPU of a kind of extensive power distribution network independently resolve.

Background technology

In the engineering research of power distribution automation and intelligent distribution network, electromagnetic transient simulation is indispensable link, and electrical network real-time simulator can carry out real-time simulation to electromagnetic transient, and its application is very extensive. Electrical network real-time simulator can be used to the primary equipment such as transformer, power line, electric switch, reactor, capacitor in analog ligand electrical network; can connect to form closed-loop system real time execution with secondary devices such as the communication of power system, supervision, control and protections, can be used as the verification tool of detection validation secondary device performance. But electro-magnetic transient real-time simulator needs the quick dynamic process of electrical network that simulated time constant is very little, it calculates step-length and requires very little (should be less than 100us), and very little calculating step-length has caused grid simulation scale to be restricted. The calculating scale of the each processor of electromagnetic transient simulation device of international popular is generally 24 three-phase nodes, and the node of actual power distribution network reaches hundreds of, as shown in Figure 1. Therefore,, while adopting conventional method and technology to carry out real-time simulation to extensive power distribution network, just need to carry out based on the real time operating system of many CPU modeling and the computing of power distribution network. Due to the dispatching algorithm complexity of many CPU operating system, that causes real-time simulation program writes that difficulty is large, threshold is high, and easily causes system unstable.

If can use and ripe single CPU operating system based on being simple and easy to, invention can make many CPU concurrent working carry out extensive power distribution network real-time simulation, and one has the work of using value very much beyond doubt.

Summary of the invention

The object of the invention is: a kind of extensive power distribution network modeling method that many CPU independently resolve is provided, and it can make the scale of resolving of power distribution network real-time simulation be doubled and redoubled, to overcome the deficiencies in the prior art.

The present invention is achieved in that the modeling method that the many CPU of extensive power distribution network independently resolve, for the real-time simulation of extensive power distribution network, adopt the dividing method based on electrical network physical arrangement, extensive power distribution network is divided into the stand-alone power distribution net under plural emulation meaning, and each stand-alone power distribution net uses single CPU analogue system to carry out real-time resolving; At cut-point controlled voltage source in parallel and controlled current source, the control instruction of controlled voltage source and controlled current source is the voltage to side bus and Injection Current from cut-point; The real-time variable of controlled voltage source and controlled current source uses Ethernet to transmit real time data in the time passing to offside, and the emulation intermediate variable of zones of different is set up correct logical communication link by Ethernet.

Concrete steps are as follows:

1) according to the power distribution network topology for the treatment of emulation, cut-point is set, and defines cut-point left side bus and cut-point right side bus, an extensive power distribution network is divided into plural isolated area;

2) all substation bus bars are divided in same isolated area;

3) cutting apart section one side, on left side bus or right side bus, be incorporated to controlled current source, opposite side is to be incorporated to controlled voltage source on right side bus or left side bus; Controlled current source control instruction is another side three-phase current instantaneous value; Controlled voltage source control instruction is the instantaneous value of another side three-phase voltage;

4) in single CPU emulation cabinet of bearing each isolated area, ten thousand mbit ethernet communication cards are installed, after the voltage and current signal of zones of different is packed by certain format, transmit by Ethernet, the emulation intermediate variable of zones of different is set up correct logical communication link by Ethernet.

Certain format described in step 4) comprises that three-phase current sorts by a-b-c, and each analog quantity represents with a double precision datum, takies 8 bytes; Three-phase voltage is also that each analog quantity represents with a double precision datum, takies 8 bytes by sorting by a-b-c.

Owing to adopting above technical scheme, the distribution of calculation task of the present invention is to specify according to the physical arrangement feature of power distribution network, does not need machineries dispatching, and each computing unit still, according to single cpu mode operation, uses standalone version real time operating system; And by divisional plane both sides voltage and current swap data, realized the separation calculation of power distribution network. Such mode is doubled and redoubled the scale of resolving of power distribution network real-time simulation, and the present invention is simple, and result of use is good.

Brief description of the drawings

Fig. 1 is the power distribution network topology of the extensive power distribution network of embodiments of the invention employing;

Fig. 2 is the schematic diagram of cutting apart of embodiments of the invention;

Fig. 3 be embodiments of the invention cut apart interface modeling scheme;

Fig. 4 is the real-time simulation embodiment of embodiments of the invention;

Fig. 5 and Fig. 6 are the implementation result of embodiments of the invention.

Detailed description of the invention

Below in conjunction with drawings and Examples, the present invention is described in further detail, but not as limitation of the present invention.

Embodiments of the invention: Fig. 1 is the Complicated Distribution Network of the dual-ring network structure of being drawn by 4 sections of buses of 2 transformer stations. Fig. 1 has comprised 4 switchyards, and each switchyard is drawn 6 branch feeders, and each branch feeder has some nodes; Suppose that every branch feeder has 10 nodes, this power distribution network has 240 nodes (i.e. 720 single-phase nodes); For so large-scale power distribution network, the computing capability of single emulation cabinet is inadequate.

The modeling method that the extensive many CPU of power distribution network independently resolve, arrange 4 sections for Fig. 1 and calculate bus, be respectively B1, B2, B3 and B4, be left bus and right bus by each calculating bus " division " again, be respectively B1L and B1R, B2L and B2R, B3L and B3R, B4L and B4R(as the sign in Fig. 2), after 4 sections of buses " division ", this power distribution network is divided into 3 parts taking dotted line frame as border, 2 parts that are directly connected with substation bus bar in it are responsible for calculating by CPU1, and remainder is responsible for calculating by CPU2.

For by the bus of " division " again " bonding " get up, need to carry out Equivalent Modeling to all split points, to ensure that " division " behavior does not change the electrical characteristic of whole power distribution network; Only the modeling of split point B1 (being B1L and B1R) is described below, other split point modeling methods are identical therewith.

The distribution network at B1L and B1R place is depicted as to three-phase circuit figure, as shown in Figure 3. The access in parallel 3 phase controllable voltage sources at B1L place, the control signal of voltage source is the measuring voltage at B1R place, the object of modeling is in order to ensure that B1L and B1R voltage is under any circumstance all identical like this. Simultaneously, the access three-phase controllable current source in parallel at B1R place, the control signal of current source is the inverse injection electric current of the voltage source at B1L place, the object of modeling is in order to ensure total amount of equaling of Injection Current over the ground at B1L and B1R place like this, two of increase over the ground parallel branch be equivalent to "off" over the ground. This modeling method has ensured that the electric essence of B1L and B1R is equivalent to B1. The object that postpones 1 step-length is to form algebraic loop in emulation.

In the time that technology realizes, use two real-time simulation cabinets (as emulation cabinet 1 in Fig. 4 and emulation cabinet 2), two cabinets are connected with communication optical fiber by 10,000,000,000 communication cards. In the time of emulation, packet of each simulation step length real-time exchange, cabinet 1 sends packet 1 to cabinet 2, cabinet, 2 send packet 2 to cabinet 1. The data that packet 1 comprises have B1L, B2L, B3L and shunt voltage source, the B4L place measured value to the three-phase current of each bus injection, i.e. B1Lia, B1Lib, B1Lic, B2Lia, B2Lib, B2Lic, B3Lia, B3Lib, B3Lic, B4Lia, B4Lib, B1Lic; The data that packet 2 comprises are the three-phase voltage measuring values of B1R, B2R, B3R and B4R, i.e. B1Rva, B1Rvb, B1Rvc, B2Rva, B2Rvb, B2Rvc, B3Rva, B3Rvb, B3Rvc, B4Rva, B4Rvb, B4Rvc. In two packets, data type is double precision, and each packet accounts for 96 bytes.

Success or not of the present invention depends on whether " cutting apart " modeling has changed the original electrical characteristic of power distribution network, compare for this reason before and after " cutting apart " simulation result. By a power distribution network that can move in an emulation cabinet, be placed in two cabinets and move by method of the present invention, to check " cutting apart " modeling whether can change simulation result. The method of inspection is that power distribution network is arranged to short trouble, inspection transient voltage and current waveform.

Fig. 5 is the transient voltage waveform of the power distribution network node before and after cutting apart, and can find out that the two is highly consistent; Fig. 6 is the transient current waveform of the power distribution network node before and after cutting apart, and can find out that the two is in full accord.

Claims

1. the modeling method that the many CPU of extensive power distribution network independently resolve, it is characterized in that: for the real-time simulation of extensive power distribution network, adopt the dividing method based on electrical network physical arrangement, extensive power distribution network is divided into the stand-alone power distribution net under plural emulation meaning, and each stand-alone power distribution net uses single CPU analogue system to carry out real-time resolving; At cut-point controlled voltage source in parallel and controlled current source, the control instruction of controlled voltage source and controlled current source is the voltage to side bus and Injection Current from cut-point; The real-time variable of controlled voltage source and controlled current source uses Ethernet to transmit real time data in the time passing to offside, and the emulation intermediate variable of zones of different is set up correct logical communication link by Ethernet.

2. the modeling method that the many CPU of extensive power distribution network according to claim 1 independently resolve, is characterized in that: concrete steps are as follows:

2) all substation bus bars are divided in same isolated area;

3. the modeling method that the many CPU of extensive power distribution network according to claim 2 independently resolve, it is characterized in that: the certain format described in step 4) comprises that three-phase current sorts by a-b-c, each analog quantity represents with a double precision datum, takies 8 bytes; Three-phase voltage is also that each analog quantity represents with a double precision datum, takies 8 bytes by sorting by a-b-c.