CN116562864A - Electric power point-to-point transaction method and system of direct-current micro-grid interconnection system - Google Patents

Electric power point-to-point transaction method and system of direct-current micro-grid interconnection system Download PDF

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CN116562864A
CN116562864A CN202310840386.6A CN202310840386A CN116562864A CN 116562864 A CN116562864 A CN 116562864A CN 202310840386 A CN202310840386 A CN 202310840386A CN 116562864 A CN116562864 A CN 116562864A
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CN116562864B (en
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桑子夏
雷何
刘斌
方仍存
汪颖翔
张浩钦
王雅文
关梓佑
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Economic and Technological Research Institute of State Grid Hubei Electric Power Co Ltd
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Abstract

The method comprises the steps of firstly obtaining total transaction power of a direct-current micro-grid interconnection system in real time, determining energy supply and demand ratio of the system based on the total transaction power, obtaining internal electricity price of the system according to the energy supply and demand ratio of the system, generating a voltage reference value of a public direct-current bus by a public energy gateway of the direct-current micro-grid interconnection system based on the internal electricity price of the system, adjusting actual voltage of the public direct-current bus to the voltage reference value, reading voltage signals of the public direct-current bus by user energy gateways corresponding to all direct-current micro-grids in the direct-current micro-grid interconnection system, generating the internal electricity price of the system based on the read voltage signals, and finally performing point-to-point transaction settlement based on the internal electricity price of the system. The method and the system not only do not depend on communication conditions and power prediction data, but also can adapt to the time-varying characteristics of internal tide of the direct-current micro-grid interconnection system.

Description

Electric power point-to-point transaction method and system of direct-current micro-grid interconnection system
Technical Field
The invention belongs to the technical field of direct-current micro-grid interconnection systems, and particularly relates to a power point-to-point transaction method and system of a direct-current micro-grid interconnection system.
Background
With the gradual increase of the duty ratio of renewable energy sources in a power distribution network, a large amount of renewable energy sources are connected to bring adverse effects such as power flow abnormality and voltage fluctuation to a power distribution system, and micro-grid technology is proposed to solve the problems of connection and control of distributed power generation. Considering that a plurality of micro-grids are gathered to form an interconnection system, the micro-grid power supply reliability can be further improved, the in-situ consumption of a distributed power supply is promoted, and the concept of the micro-grid interconnection system is proposed and is mainly divided into an alternating-current micro-grid interconnection system and a direct-current micro-grid interconnection system. Because the direct current distribution mode does not need to consider the problems of phase, frequency, reactive power and the like compared with the alternating current distribution mode, as the direct current energy storage equipment and direct current load in a future power distribution network are gradually increased, the direct current micro-grid interconnection system has more remarkable advantages compared with the alternating current micro-grid interconnection system when the problems of distributed power generation access and direct current load power supply are solved.
A dc microgrid interconnection system is typically formed by interconnecting a plurality of dc microgrids through a common dc bus, as shown in fig. 1, where each dc microgrid corresponds to a power consumer. Because of the popularization of distributed power generation at the user side, the role of power consumers is gradually changed into the role of power producers and consumers, so that the energy sharing of a plurality of power consumers in the direct-current micro-grid interconnection system is possible, and the transaction method of the direct-current micro-grid interconnection system is also receiving a great deal of attention. The P2P (peer-to-peer) transaction is a novel energy transaction technology, and is more suitable for being used as a transaction method of a direct-current micro-grid interconnection system because the direct energy transaction among a plurality of electric energy generators and consumers can be realized, the transaction efficiency is improved, the cost is reduced, and the electric energy generators and consumers are effectively guided to participate in demand side management.
At present, a matching transaction mode is mostly adopted in P2P transaction in a direct current micro-grid interconnection system. The matching transaction mode follows the principles of price priority and time priority, and the price priority and time priority principles require that the transaction can be completed only after the electricity selling user and the electricity buying user agree on a certain price, the electric power users with high bidding at the same time period can obtain the required electric energy preferentially, and the electric power users who make a transaction request firstly obtain the required electric energy when bidding the same time. The main disadvantage of this mode is that it often occurs in a queued transaction, resulting in poor transaction flexibility and transaction time lag. In addition, this mode typically requires acquisition of the power consumer's day-ahead power plan, and multiple communication negotiations between the electricity selling and buying subscribers, and the internal electricity prices being communicated to the individual subscribers within the system via the communication lines to complete the transaction, relying heavily on predictive data and communication techniques. Meanwhile, in consideration of uncertainty and volatility of distributed power generation, the P2P transaction in the direct-current micro-grid interconnection system is required to be fully adapted to time-varying characteristics of internal power flow of the system, and the traditional matching transaction mode cannot meet the requirement, so that a novel P2P transaction method is necessary to be provided for the direct-current micro-grid interconnection system.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a power point-to-point trading method and a power point-to-point trading system of a direct current micro grid interconnection system which do not depend on communication conditions and power prediction data.
In order to achieve the above object, the technical scheme of the present invention is as follows:
in a first aspect, the present invention provides a method for peer-to-peer transaction of electric power in a direct current micro grid interconnection system, including:
s1, a public energy gateway of a direct current micro-grid interconnection system generates a voltage reference value of a public direct current bus based on the internal electricity price of the system, and adjusts the actual voltage of the public direct current bus to the voltage reference value;
s2, the user energy gateway corresponding to each direct current micro grid in the direct current micro grid interconnection system reads the voltage signal of the current public direct current bus, and generates the internal electricity price of the system based on the read voltage signal.
In the step S1, the voltage reference value of the common direct current bus is calculated by adopting the following formula:
in the above-mentioned method, the step of,for the voltage reference value of the common dc bus in time slot h,/->、/>Upper and lower limit values of the voltage allowed by the public DC bus respectively, < >>For +.>And->Mean value of->、/>Respectively, the power grid electricity price and the internet electricity price，/>、/>And buying and selling electricity prices in the system in the time slot h respectively.
In the step S2, the internal electricity price of the system is calculated by adopting the following formula:
in the above-mentioned method, the step of,、/>the price of electricity is respectively purchased and sold in the system in the time slot h, and the price is +>Energy supply/demand ratio for system in time slot h, +.>、/>The electricity price of the power grid and the electricity price of the internet are respectively +.>For +.>And->Mean value of->Voltage of common DC bus, +.>、/>The upper limit value and the lower limit value of the voltage allowed by the public direct current bus are respectively adopted.
The method further comprises the steps of:
s0, acquiring total transaction power of the direct-current micro-grid interconnection system in real time, determining the energy supply and demand ratio of the system based on the total transaction power, and obtaining the internal electricity price of the system according to the energy supply and demand ratio of the system.
In the step S0, the energy supply-demand ratio of the system is calculated by adopting the following formula:
in the above-mentioned method, the step of,energy supply/demand ratio for system in time slot h, +.>、/>Respectively, the total selling power, buying power, of the system in time slot h,>and n is the number of the direct current micro-grids in the system, wherein the transaction power of the ith direct current micro-grid and the public direct current bus in the time slot h is obtained.
The method further comprises the steps of:
s3, performing point-to-point transaction settlement on each direct current micro grid based on the internal electricity price of the system in each time slot h, wherein the time slot h is of the second level.
In a second aspect, the invention provides a power point-to-point transaction system of a direct-current micro-grid interconnection system, which comprises a common direct-current bus voltage reference value determining module, a voltage adjusting module and a system internal electricity price generating module;
the system comprises a public direct current bus voltage reference value determining module and a voltage adjusting module, wherein the public direct current bus voltage reference value determining module and the voltage adjusting module are arranged in a public energy gateway of a direct current micro-grid interconnection system, the public direct current bus voltage reference value determining module is used for generating a voltage reference value of a public direct current bus based on the internal electricity price of the system, and the voltage adjusting module is used for adjusting the actual voltage of the public direct current bus to the voltage reference value;
the system internal electricity price generating module is arranged in a user energy gateway corresponding to each direct current micro grid in the direct current micro grid interconnection system, and is used for reading voltage signals of the public direct current buses and generating system internal electricity prices based on the read voltage signals.
The system also comprises a system energy supply-demand ratio calculation module and a system internal electricity price calculation module;
the system energy supply-demand ratio calculation module is used for acquiring the total transaction power of the direct-current micro-grid interconnection system in real time and determining the energy supply-demand ratio of the system based on the total transaction power;
and the system internal electricity price calculation module calculates the system internal electricity price according to the energy supply-demand ratio of the system.
The system also comprises a point-to-point transaction settlement module;
the point-to-point transaction settlement module is used for performing point-to-point transaction settlement on each direct current micro grid based on the internal electricity price of the system in each time slot h, wherein the time slot h is of the second level.
The common direct current bus voltage reference value determining module calculates and obtains a voltage reference value of the common direct current bus based on the following formula:
in the above-mentioned method, the step of,for the voltage reference value of the common dc bus in time slot h,/->、/>Upper and lower limit values of the voltage allowed by the public DC bus respectively, < >>For +.>And->Mean value of->、/>The electricity price of the power grid and the electricity price of the internet are respectively +.>、/>And buying and selling electricity prices in the system in the time slot h respectively.
The system internal electricity price generating module calculates the system internal electricity price based on the following formula:
in the above-mentioned method, the step of,、/>the price of electricity is respectively purchased and sold in the system in the time slot h, and the price is +>Energy supply/demand ratio for system in time slot h, +.>、/>The electricity price of the power grid and the electricity price of the internet are respectively +.>For +.>And->Mean value of->Voltage of common DC bus, +.>、/>The upper limit value and the lower limit value of the voltage allowed by the public direct current bus are respectively adopted.
The system energy supply and demand ratio calculation module calculates the energy supply and demand ratio of the system based on the following formula:
in the above-mentioned method, the step of,energy supply/demand ratio for system in time slot h, +.>、/>Respectively, the total selling power, buying power, of the system in time slot h,>and the transaction power of the ith direct current micro grid and the public direct current bus in the time slot h is obtained.
The system internal electricity price calculation module calculates the system internal electricity price based on the following formula:
。
compared with the prior art, the invention has the beneficial effects that:
1. the method for the point-to-point transaction of the electric power of the direct-current micro-grid interconnection system provided by the invention comprises the steps of firstly generating a voltage reference value of a public direct-current bus by a public energy gateway of the direct-current micro-grid interconnection system based on the internal electric power of the system, adjusting the actual voltage of the public direct-current bus to the voltage reference value, then reading a voltage signal of the public direct-current bus by a user energy gateway corresponding to each direct-current micro-grid in the direct-current micro-grid interconnection system, generating the internal electric power of the system based on the read voltage signal, namely, transmitting the internal electric power of the system to each direct-current micro-grid user in a mode of transmitting the electric power information through the electric power of the public direct-current bus, and has the characteristic of independent communication.
2. The power point-to-point trading method of the direct current micro grid interconnection system provided by the invention acquires the total trading power of the direct current micro grid interconnection system in real time, determines the energy supply and demand ratio of the system based on the total trading power, and finally obtains the internal electricity price of the system according to the energy supply and demand ratio of the system, so that not only does not need any forecast data, but also the power users do not need to conduct price negotiation, thereby solving the problems of poor trading flexibility and lag in trading time.
3. The power point-to-point transaction method of the direct current micro grid interconnection system provided by the invention carries out point-to-point transaction settlement on each direct current micro grid based on the internal power price of the system in each time slot h, namely, a quick settlement mode is adopted, and the mode can ensure that the internal power price of the system during transaction can correctly reflect the supply and demand state of the current system, so that the method is suitable for the time-varying characteristics of the internal power flow of the direct current micro grid interconnection system.
Drawings
Fig. 1 is a schematic structural diagram of a dc micro grid interconnection system.
Fig. 2 is an overall frame diagram of the transaction method according to embodiment 1.
Fig. 3 is a schematic diagram of an implementation of the real-time power measurement procedure in embodiment 1.
Fig. 4 is a schematic diagram showing the implementation of the system internal electricity price generation section in embodiment 1.
Fig. 5 is a schematic diagram of the implementation of the bias signal generation section in embodiment 1.
Fig. 6 is a schematic diagram of the implementation of the system internal electricity price acquisition link in embodiment 1.
Fig. 7 is a schematic diagram of the implementation of the transaction settlement link in embodiment 1.
Fig. 8 is a frame diagram of the system of example 2.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and the accompanying drawings.
The invention provides a point-to-point transaction method and a point-to-point transaction system for electric power of a direct current micro grid interconnection system, which aim at the direct current micro grid interconnection system shown in figure 1, the method utilizes the voltage deviation of a public direct current bus to reflect the real-time supply-demand ratio SDR of the system, then a controller of a user energy gateway corresponding to each direct current micro grid obtains the real-time internal electricity price of the system obtained by calculation of the real-time SDR through measuring deviation signals, and finally a third party energy provider immediately settles the electricity buying expense or selling income of each electric energy producer in each time slot according to the transaction power of each electric energy producer and the internal electricity price of the system in the current time slot. Meanwhile, the third party energy provider immediately settles the buying electricity expense or selling electricity income of each electric energy producer according to the transaction power of each electric energy producer and the internal electricity price of the current time slot in each time slot. The method has the advantages that the method does not depend on any communication and prediction means, and the energy transaction of a plurality of power users in the DC micro-grid interconnection system can be realized under the condition of no communication condition and prediction data. Meanwhile, the transaction settlement adopts a quick settlement mode, namely, the expenditure or income of all users is settled in each time slot, so that the time-varying characteristic of the internal tide of the direct-current micro-grid interconnection system can be fully adapted, and the energy transaction process can be ensured not to be influenced even in severe occasions where the internal power variable of the system frequently and quickly fluctuates.
Time slot h: a time slot refers to a sufficiently short time interval during which the trading power of an electrical energy producer may be considered to be approximately constant, replaced by its average value during the time interval. The specific length of the time slot depends on the requirement on the real-time performance of the power transaction, and the time scale of h is selected as the second level so as to adapt to the time-varying characteristic of the internal tide of the DC micro-grid interconnection system.
Example 1:
referring to fig. 2, a method for performing a point-to-point transaction on power of a direct current micro grid interconnection system uses a time slot h=1s as a transaction period to perform a cyclic transaction, and each transaction period sequentially completes the transaction according to the following steps:
1. the real-time power measurement procedure is shown in fig. 3.
The transaction power of each direct-current micro-grid and the public direct-current bus in the current time slot is obtained in real time by utilizing the intelligent ammeter configured at the joint of the direct-current micro-grid and the public direct-current bus, and the total transaction power of the direct-current micro-grid interconnection system is obtained based on the following formula:
in the above-mentioned method, the step of,、/>respectively, the total selling power, buying power, of the system in time slot h,>and n is the number of the direct current micro-grids in the system, wherein the transaction power of the ith direct current micro-grid and the public direct current bus in the time slot h is obtained.
2. The internal electricity price generation link is shown in fig. 4.
Firstly, determining the energy supply and demand ratio of a system based on total transaction power, and then obtaining the internal electricity price of the system according to the energy supply and demand ratio of the system, wherein the specific calculation formula is as follows:
in the above-mentioned method, the step of,energy supply/demand ratio for system in time slot h, +.>The electricity price is purchased for the system in the time slot h, namely the price of each direct current micro-grid buying unit electric energy from the public direct current bus,/for>Selling electricity price for the system in time slot h, namely selling price of unit electric energy of each direct-current micro-grid to a public direct-current bus, < >>、/>The power grid electricity price and the internet electricity price are respectively.
The internal electricity price of the system is generated based on real-time SDR and follows a proper pricing mechanism, so that the real-time economic balance of the system is ensured, and the supply and demand principles of market economics are met.
3. The bias signal generation step is shown in fig. 5.
The link is used for mapping the internal electricity price to the voltage signal of the public direct current bus in real time, and sequentially comprises the following steps:
3.1, the public energy gateway of the direct current micro-grid interconnection system generates a voltage reference value of a public direct current bus based on the internal electricity price of the system:
in the above-mentioned method, the step of,for the voltage reference value of the common dc bus in time slot h,/->、/>Upper and lower limit values of the voltage allowed by the public DC bus respectively, < >>For +.>And->Mean value of->、/>The electricity price of the power grid and the electricity price of the internet are respectively +.>、/>Respectively buying and selling electricity prices in the system in the time slot h;
3.2, the public energy gateway collects the voltage of the public DC busAnd generates a switching signal of the three-phase PWM rectifier through the voltage-current double closed-loop controller>Thereby will->Is adjusted to be equal to the voltage reference value->Equal.
4. An internal electricity price acquisition link is shown in fig. 6.
The link is used for acquiring the internal electricity price by measuring the voltage signal of the public direct current bus. Firstly, a user energy gateway corresponding to each direct current micro-grid reads a voltage signal of a current public direct current busAnd calculating the internal electricity price of the system based on the read voltage signal:
。
5. transaction settlement links, as shown in fig. 7.
The link is used for transaction settlement of the third party energy provider and each direct current micro-grid. Firstly, recording transaction power of a direct-current micro-grid and a public direct-current bus in a current time slot by a smart electric meter corresponding to each direct-current micro-grid, and then judging whether an electric energy producer corresponding to the direct-current micro-grid is an electricity selling user or an electricity buying user in the current time slot: if the electric energy is sold, the electric energy producer and the consumer should obtain the gain as the product of the absolute value of the transaction power and the internal selling electricity price in the time slot, and if the electric energy is purchased, the electric energy producer and the consumer should pay the expense as the product of the absolute value of the transaction power and the internal buying electricity price in the time slot, namely:
in the above-mentioned method, the step of,for the transaction amount of the ith direct-current micro-grid in the time slot h, the positive value indicates that the ith direct-current micro-grid should obtain the selling electricity income in the time slot h, and the negative value indicates that the ith direct-current micro-grid should pay the buying electricity expenditure in the time slot h.
Example 2:
referring to fig. 8, a power point-to-point transaction system of a direct current micro grid interconnection system includes a system energy supply-demand ratio calculation module, a system internal power price calculation module, a common direct current bus voltage reference value determination module, a voltage adjustment module, a system internal power price generation module, and a point-to-point transaction settlement module.
The system energy supply-demand ratio calculation module is used for acquiring the total transaction power of the direct-current micro-grid interconnection system in real time and determining the energy supply-demand ratio of the system based on the total transaction power:
in the above-mentioned method, the step of,energy supply/demand ratio for system in time slot h, +.>、/>Respectively, the total selling power, buying power, of the system in time slot h,>and the transaction power of the ith direct current micro grid and the public direct current bus in the time slot h is obtained.
The system internal electricity price calculation module calculates the system internal electricity price according to the energy supply-demand ratio of the system based on the following formula:
in the above-mentioned method, the step of,、/>the price of electricity is respectively purchased and sold in the system in the time slot h, and the price is +>、/>The power grid electricity price and the internet electricity price are respectively.
The public direct current bus voltage reference value determining module and the voltage adjusting module are arranged in a public energy gateway of the direct current micro-grid interconnection system, and the public direct current bus voltage reference value determining module is used for generating a voltage reference value of a public direct current bus based on the internal electricity price of the system by adopting the following formula:
in the above-mentioned method, the step of,for the voltage reference value of the common dc bus in time slot h,/->、/>Upper and lower limit values of the voltage allowed by the public DC bus respectively, < >>For +.>And->Is a mean value of (c).
The voltage adjustment module is used for adjusting the actual voltage of the common direct current bus to the voltage reference value.
The system internal electricity price generating module is arranged in a user energy gateway corresponding to each direct current micro grid in the direct current micro grid interconnection system, and is used for reading voltage signals of the public direct current buses and calculating to obtain the system internal electricity price by adopting the following formula based on the read voltage signals:
/>
in the above-mentioned method, the step of,、/>the price of electricity is respectively purchased and sold in the system in the time slot h, and the price is +>Energy supply/demand ratio for system in time slot h, +.>、/>The electricity price of the power grid and the electricity price of the internet are respectively +.>For +.>And->Mean value of->Voltage of common DC bus, +.>、/>The upper limit value and the lower limit value of the voltage allowed by the public direct current bus are respectively adopted.
The point-to-point transaction settlement module is used for performing point-to-point transaction settlement on each direct current micro grid based on the internal electricity price of the system in each time slot h, wherein the transaction amount is calculated by adopting the following formula:
in the above-mentioned method, the step of,and (3) the transaction amount of the ith direct current micro-grid in the time slot h. />

Claims (9)

1. A power point-to-point transaction method of a direct current micro-grid interconnection system is characterized in that,
the method comprises the following steps:
s1, a public energy gateway of a direct current micro-grid interconnection system generates a voltage reference value of a public direct current bus based on the internal electricity price of the system, and adjusts the actual voltage of the public direct current bus to the voltage reference value;
s2, the user energy gateway corresponding to each direct current micro grid in the direct current micro grid interconnection system reads the voltage signal of the current public direct current bus, and generates the internal electricity price of the system based on the read voltage signal.
2. The method for power point-to-point transaction of a direct current micro grid interconnection system as recited in claim 1, wherein,
in the step S1, the voltage reference value of the common direct current bus is calculated by adopting the following formula:
；
；
in the above-mentioned method, the step of,for the voltage reference value of the common dc bus in time slot h,/->、/>Upper and lower limit values of the voltage allowed by the public DC bus respectively, < >>For +.>And->Mean value of->、/>The electricity price of the power grid and the electricity price of the internet are respectively +.>、/>And buying and selling electricity prices in the system in the time slot h respectively.
3. The method for power point-to-point transaction of a direct current micro grid interconnection system as recited in claim 1, wherein,
in the step S2, the internal electricity price of the system is calculated by adopting the following formula:
；
；
；
；
in the above-mentioned method, the step of,、/>the price of electricity is respectively purchased and sold in the system in the time slot h, and the price is +>Energy supply/demand ratio for system in time slot h, +.>、/>The electricity price of the power grid and the electricity price of the internet are respectively +.>For +.>And->Is used for the average value of (a),voltage of common DC bus, +.>、/>The upper limit value and the lower limit value of the voltage allowed by the public direct current bus are respectively adopted.
4. The method for power point-to-point transaction of a direct current micro grid interconnection system as recited in claim 1, wherein,
the method further comprises the steps of:
s0, acquiring total transaction power of the direct-current micro-grid interconnection system in real time, determining the energy supply and demand ratio of the system based on the total transaction power, and obtaining the internal electricity price of the system according to the energy supply and demand ratio of the system.
5. The method for power point-to-point transaction of a direct current micro grid interconnection system as recited in claim 4, wherein,
in the step S0, the energy supply-demand ratio of the system is calculated by adopting the following formula:
；
；
；
in the above，Energy supply/demand ratio for system in time slot h, +.>、/>Respectively, the total selling power, buying power, of the system in time slot h,>and n is the number of the direct current micro-grids in the system, wherein the transaction power of the ith direct current micro-grid and the public direct current bus in the time slot h is obtained.
6. The method for power point-to-point transaction of a direct current micro grid interconnection system as recited in claim 1, wherein,
the method further comprises the steps of:
s3, performing point-to-point transaction settlement on each direct current micro grid based on the internal electricity price of the system in each time slot h, wherein the time slot h is of the second level.
7. A power point-to-point transaction system of a direct current micro-grid interconnection system is characterized in that,
the system comprises a common direct current bus voltage reference value determining module, a voltage adjusting module and a system internal electricity price generating module;
the system comprises a public direct current bus voltage reference value determining module and a voltage adjusting module, wherein the public direct current bus voltage reference value determining module and the voltage adjusting module are arranged in a public energy gateway of a direct current micro-grid interconnection system, the public direct current bus voltage reference value determining module is used for generating a voltage reference value of a public direct current bus based on the internal electricity price of the system, and the voltage adjusting module is used for adjusting the actual voltage of the public direct current bus to the voltage reference value;
the system internal electricity price generating module is arranged in a user energy gateway corresponding to each direct current micro grid in the direct current micro grid interconnection system, and is used for reading voltage signals of the public direct current buses and generating system internal electricity prices based on the read voltage signals.
8. The power point-to-point transaction system of a direct current micro grid interconnection system as recited in claim 7, wherein,
the system also comprises a system energy supply-demand ratio calculation module and a system internal electricity price calculation module;
the system energy supply-demand ratio calculation module is used for acquiring the total transaction power of the direct-current micro-grid interconnection system in real time and determining the energy supply-demand ratio of the system based on the total transaction power;
and the system internal electricity price calculation module calculates the system internal electricity price according to the energy supply-demand ratio of the system.
9. The power point-to-point transaction system of a direct current micro grid interconnection system as recited in claim 7, wherein,
the system also comprises a point-to-point transaction settlement module;
the point-to-point transaction settlement module is used for performing point-to-point transaction settlement on each direct current micro grid based on the internal electricity price of the system in each time slot h, wherein the time slot h is of the second level.
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