CN106786566A - Photovoltaic plant power supply dispatching system and method - Google Patents
Photovoltaic plant power supply dispatching system and method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
Present invention is disclosed a kind of photovoltaic plant power supply dispatching system and method, two major defects of its pattern of being generated electricity by way of merging two or more grid systems mainly for the photovoltaic plant state monopoly for purchase and marketing：1) repeatedly transformation and long-distance sand transport produce larger electric energy loss；2) certain photovoltaic plant loss in revenue is caused with relatively low rate for incorporation into the power network sale of electricity.Photovoltaic plant power supply dispatching system and method for the present invention so that photovoltaic plant preferentially can power to local third party terminal user (abbreviation local user), reduce due to the electric energy loss that input public electric wire net brings.Meanwhile, the present invention have also been devised the pricing method that a kind of photovoltaic plant is directly powered to local user so that photovoltaic plant can sell part electricity with the price higher than rate for incorporation into the power network, and local user can buy in part electricity with the price less than power network zero potential energy.The present invention can reduce the loss of photovoltaic electric station grid connection generating, while increasing photovoltaic power station power generation income, reduce local user's electric cost.
Description
Technical Field
The invention relates to the field of photovoltaic power generation, in particular to the field of photovoltaic power generation dispatching.
Background
The new energy power supply mode represented by solar photovoltaic power generation has better application prospect. At present, photovoltaic power stations generally adopt a general-purpose grid-connected mode to obtain power generation benefits. In the mode, the photovoltaic power station needs to convert and boost the electric energy generated by the photovoltaic system through the direct current/alternating current of the inverter, then the electric energy is connected to a public power grid high-voltage line, and the generated electricity income is settled according to the grid-connected generated energy and the on-grid electricity price. This mode has two disadvantages: on the one hand, the electric energy produced by the photovoltaic power station can reach users through multiple transformation conversion and long-distance line transmission, so that more energy loss is generated. On the other hand, a certain price difference exists between the on-line electricity price and the power grid retail electricity price, and the photovoltaic power station sells all produced electric energy at a lower on-line electricity price, so that certain power generation income is lost.
Disclosure of Invention
The invention aims to solve the technical problem of realizing a photovoltaic dispatching system and a method which can reduce the loss of grid-connected power generation of photovoltaic power stations, increase the power generation benefit of the photovoltaic power stations and reduce the power consumption cost of local users.
In order to achieve the purpose, the invention adopts the technical scheme that: photovoltaic power plant power supply dispatch system, photovoltaic module among the photovoltaic power plant converts solar energy into the direct current, and the direct current converts low-voltage alternating current into through the inverter, the low-voltage alternating current of inverter output divides two tunnel outputs, wherein connect step-up transformer through first knife switch, first fuel gauge all the way, inserts public electric network high-voltage bus after step-up transformer steps up, and another way connects local low pressure user line through second knife switch, second fuel gauge and supplies power to the user, public electric network high-voltage bus is connected with local low-voltage user line through step-down transformer, third knife switch, user's power consumption load is connected with local low-voltage user line through electric energy controller.
The system is provided with a power grid control node, the power grid control node is in mutual communication with the first electric quantity meter, the second electric quantity meter, the electric energy controllers of all users and the photovoltaic power station through a communication network, and information collected by the first electric quantity meter, the second electric quantity meter and the electric energy controllers is sent to the power grid control node in real time.
The first electricity meter is used for measuring the electric quantity output to a public power grid by the photovoltaic power station, the second electricity meter is used for measuring the electric quantity of a direct supply local user of the photovoltaic power station, and the electric energy controller of the user measures the power consumption of the electric load of the user.
Based on the scheduling method of the photovoltaic power station power supply scheduling system, the power grid control node dynamically adjusts the on-off states of the first disconnecting link switch, the second disconnecting link switch and the third disconnecting link switch, so that the photovoltaic power station is switched among the following three power supply operation states;
1) the off-grid state of the photovoltaic power station is as follows: when the power generation power of the photovoltaic power station is smaller than the power supply standard, the third disconnecting link switch is switched on, the first disconnecting link switch and the second disconnecting link switch are switched off, and a local user is supplied with power by a high-voltage bus of a public power grid;
2) the photovoltaic power station and the public power grid jointly supply power: when the power generation power of the photovoltaic power station reaches the power supply standard but cannot completely meet the power consumption requirement of a local user, the second disconnecting link switch and the third disconnecting link switch are switched on, the first disconnecting link switch is switched off, and the local user is supplied with power by the photovoltaic power station and a public power grid high-voltage bus;
3) the independent power supply state of the photovoltaic power station is as follows: when the power generation power of the photovoltaic power station can meet the power consumption demand of a local user, the third disconnecting link switch is switched off, the first disconnecting link switch and the second disconnecting link switch are switched on, the local user is powered by the photovoltaic power station, and meanwhile, the residual electric quantity of the photovoltaic power station is input into a high-voltage bus of a public power grid for power supply.
The off-grid state of the photovoltaic power station further comprises that the third disconnecting switch is switched on and the first disconnecting switch and the second disconnecting switch are switched off when the maintenance and the power grid stability control are needed.
The electric charge pricing method based on the scheduling method comprises a fixed price method and a dynamic pricing method;
the fixed price method comprises the following steps:
the price of the photovoltaic power station for supplying power to local users is psAnd the electricity price input into the public power grid by the photovoltaic power station is pfThe price of electricity bought from the public power grid by the local user is pr；
ps＝θpf+(1-θ)pr(ii) a Wherein theta is a self-defined adjusting parameter and meets the condition that theta is more than or equal to 0 and less than or equal to 1;
the dynamic pricing method comprises the following steps:
step 1: photovoltaic power station supply power price p in t time periods,tIs set as pfAs an initial value;
step 2: the photovoltaic power station sends p through the networks,tSending the data to all users;
and step 3: the power controller of each user is based on the received ps,tAcquiring the planned power consumption of each local user within a time period t according to preset data;
and 4, step 4: sending the planned electricity consumption of the user to a power grid control node;
and 5: the power grid control node sums the received planned power consumption information of all the users in the time period t, and then sends the result to the photovoltaic power station;
step 6: photovoltaic power station based on all receivedUser plans total electricity consumption e in t time perioduser,tAnd expected power generation amount e in the period tpv,tCalculating the expected profit of the t time period,
and 7: price p of power supplys,tIncreasing Δ p, wherein Δ p is the step size;
and 8: determining a power supply price ps,tWhether it is greater than retail price p of power gridrIf p iss,tIs not more than prGo back and repeat steps 2-8 if ps,tGreater than prEntering step 9;
and step 9: comparing expected income which can be obtained by the photovoltaic power station under all possible power supply prices, and selecting the set power price when the expected income is maximum as the power supply price p of the t time periods,tAnd the data are sent to a power grid control node and a user.
The power supply settlement method for the photovoltaic power station comprises the following steps: the power supply income of the photovoltaic power station and the electricity purchasing cost of each user are uniformly settled by the power grid control node, and the electric quantity measured by the second electricity meter in the time period t is cuser, tAnd the total electric quantity directly provided by the photovoltaic power station to the user in the time period t is represented, and the electric quantity measured by the first electric quantity in the time period t is cfeed , tAnd the electric quantity measured by the electric energy controller of the user i in the time period t is ci, tThe total electric quantity consumed by the user i in the time period t, the income settlement of the photovoltaic power station every day and the calculation method of the electric charge of each user are represented as follows:
if the photovoltaic power station adopts a fixed electricity price psAnd the electricity selling income of the photovoltaic power station in one day comprises two parts of the income of direct supply users and the income input into a public power grid:
the fixed price method electricity selling income calculation formula is as follows:
the dynamic pricing method has the following calculation formula of electricity selling income:
the user electric charge settlement method comprises the following steps: the electricity purchasing cost of the user i in one day comprises two parts of electricity purchasing cost from a photovoltaic power station and electricity purchasing cost from a public power grid;
if the photovoltaic power station adopts a fixed price method, the unit price of the electric quantity is psThen the electricity charge calculation formula of the household i in one day is
Wherein N is the total number of local users;
if the power station adopts a dynamic pricing method, the calculation formula of the electric charge of the user i in one day is
Wherein,the ratio of the total electric quantity provided by the photovoltaic power station to the users to the total electric quantity used by all the users in the t time period is represented,represents the amount of photovoltaic plant power consumed by user i during the t period, andrepresenting the common power consumed by user i during a period of time tAnd (4) the power supply of the network.
Compared with the prior art, the method of the invention has the following characteristics:
1. the working mode of the existing photovoltaic power station mainly adopts the scheme of self-use of power generation and internet surfing of surplus power.
2. The conventional photovoltaic power station grid-connected power generation income settlement adopts a general purchase and total sale mode, and the on-line electricity price is lower than the power grid retail electricity price. At the same time, local users can also use the electricity produced by the photovoltaic power station at a price lower than the retail price of the grid. The method of the invention is beneficial to photovoltaic power stations and local users.
3. The invention designs two pricing methods of fixed price and dynamic pricing. The fixed price method is simple and easy to implement, and is suitable for the condition that the user load can not dynamically adjust the power consumption power and the power consumption time period. With the development of intelligent electrical appliance technology, many flexible user loads can dynamically adjust the power consumption power and the power consumption time period. At the moment, a dynamic pricing method is adopted, so that a user can be guided to adjust the power consumption demand to a time period with more generated energy of the photovoltaic power station as much as possible, and the utilization rate of clean electric energy is improved.
4. The dynamic pricing method designed by the invention is based on a distributed computing method, and when the photovoltaic power station is priced, the information such as power utilization preference and individual power utilization plan of each user does not need to be known, and only the local user total power utilization plan information sent by a credible power grid control node is needed. The method has strong expandability and can protect the privacy information of the user.
Drawings
The following is a brief description of the contents of each figure in the description of the present invention:
FIG. 1 is a block diagram of a photovoltaic power plant power supply scheduling system;
fig. 2 is a charging flow chart in a power supply scheduling method of a photovoltaic power station.
Detailed Description
Photovoltaic power plant power supply system structure:
the structure of the power supply system of the photovoltaic power station adopted by the invention is shown in figure 1:
the photovoltaic modules 2 in the photovoltaic power station 1 convert solar energy into direct current, and the direct current is converted into low-voltage alternating current through the inverter 3. The low-voltage alternating current is divided into two paths, one path is connected with a local low-voltage subscriber line 6 through a second disconnecting link switch 4 and a second electricity meter 5, and power is supplied to local subscribers (such as 7 and 8); and the other path is connected with a first electricity meter 10 through a first knife switch 9 and a step-up transformer 11, and is connected to a public power grid high-voltage bus 12 after being stepped up. The public power grid high-voltage bus is connected with a local low-voltage subscriber line through a step-down transformer 13 and a third disconnecting switch 14, and the electric loads (15, 16, 17 and 18) of the users are connected with the local low-voltage subscriber line through electric energy controllers (19 and 20).
The grid control node 21 in the system communicates with the individual electricity meters, the individual users' power controllers and the photovoltaic plants via a communication network 22. And the power grid control node controls the opening and closing states of the disconnecting link switches according to the power generation state of the photovoltaic power station and the power utilization condition of the user, so that the electric energy transmission scheduling of the photovoltaic power station is realized. Meanwhile, the power grid control node realizes the functions of electric quantity metering collection, electric charge settlement and the like. The communication network can adopt a wireless communication technology, a power line communication technology or a mixed network form combining the two technical schemes according to the actual deployment situation. The second electricity meter 5 is used for measuring the electricity quantity of a photovoltaic power station direct supply local user, the first electricity meter 10 is used for measuring the electricity quantity output to a public power grid by the photovoltaic power station, the electricity consumption controller of the user can measure the electricity consumption of an electricity load, and information collected by the electricity meters and the electricity controller is sent to a power grid control node in real time. For some flexible electric loads, such as an air conditioning system capable of adjusting a set temperature, and a washing machine, a water heater and the like capable of adjusting an electric power consumption time period, the electric power controller can schedule and control the electric power consumption according to the electricity price.
The power supply scheduling method of the photovoltaic power station comprises the following steps:
the generated energy of the photovoltaic power station changes along with the conditions such as season, time, illumination intensity and the like, so that the photovoltaic power station has strong dynamic property. Meanwhile, the electricity consumption of the local user is also constantly changed. In order to enable the electric energy produced by the photovoltaic power station to be used by local users as much as possible, the invention designs a power supply scheduling method of the photovoltaic power station.
The specific power supply scheduling method comprises the following steps: the photovoltaic power station control system monitors environmental conditions such as illumination intensity and the self power generation state in real time and reports related monitoring data to a power grid control node; the electric energy controller of the local user monitors the power utilization information of the load in real time and reports related monitoring data to the power grid control node. And the power grid control node dynamically adjusts the opening and closing states of the second disconnecting link switch 4, the first disconnecting link switch 9 and the third disconnecting link switch 14 according to the collected photovoltaic power station operation state data and the electricity utilization information data of local users, so that the photovoltaic power station is switched among the following three power supply operation states.
1. And (5) the off-grid state of the photovoltaic power station. The power generation power of the photovoltaic power station is smaller than the power supply standard (such as at night), or due to the needs of maintenance and power grid stable control, the photovoltaic power station is off-grid, the second disconnecting link switch 4 and the first disconnecting link switch 9 are disconnected, the third disconnecting link switch 14 is switched on, and local users are powered by a public power grid.
2. And the photovoltaic power station and the public power grid jointly supply power. When the power generation power of the photovoltaic power station reaches the power supply standard but cannot completely meet the power consumption requirement of a local user, the first disconnecting link switch 9 is switched off, the second disconnecting link switch 4 and the third disconnecting link switch 14 are switched on, and the local user is simultaneously supplied with power by the photovoltaic power station and a public power grid.
3. And the photovoltaic power station is in an independent power supply state. The photovoltaic power station has higher power generation power, can completely meet the power consumption requirement of local users and has residual capacity, the third disconnecting switch 14 is switched off, the second disconnecting switch 4 and the first disconnecting switch 9 are switched on, the local users are powered by the photovoltaic power station, and meanwhile, the residual capacity of the photovoltaic power station is input into a public power grid.
A photovoltaic power station power supply pricing method comprises the following steps:
according to the actual condition of the current power grid, the electric quantity input into the public power grid by the photovoltaic power station is according to the on-line electricity price pfPricing, the quantity of electricity purchased by a local user from the public power grid is according to the retail price p of the power gridrPricing, the two prices satisfying pr>pfThe relationship (2) of (c). After the power supply scheduling method for the photovoltaic power station is adopted, the photovoltaic power station can directly perform electric energy transaction with local users. When the electricity rate of the photovoltaic power plant is set at pfAnd prIn between, the photovoltaic power plant can be higher than pfCan sell a portion of the electricity at a price below p, while local users can sell electricity at a price below prThe price of buying partial electric quantity, improve photovoltaic power plant and sell the electric income, reduce the user and purchase the electric cost.
The invention designs two photovoltaic power station pricing methods, namely a fixed price method and a dynamic pricing method. When the system is deployed, a corresponding pricing method can be selected according to actual conditions.
The fixed price method comprises the following steps:
when the electrical loads of the users are all traditional loads, the electrical power or the electrical time period cannot be dynamically adjusted, in which case the power supply price p of the photovoltaic power stationsSet to a fixed value, the calculation formula is as follows:
ps＝θpf+(1-θ)pr
and theta is an adjusting parameter and meets the condition that theta is more than or equal to 0 and less than or equal to 1, and the numerical value of theta is negotiated by the photovoltaic power station and a local user.
The dynamic pricing method comprises the following steps:
the power generation state of the photovoltaic power station changes along with external environmental conditions such as illumination intensity and the like, so that the photovoltaic power station has strong dynamic property, and in order to enable the power generation amount of the photovoltaic power station to be used by local users as much as possible, the photovoltaic power station can adopt a dynamic pricing method. The basic principle is that the power supply price p of the photovoltaic power station is setsSetting the price p of the on-line electricityfAnd the retail price p of the power gridrWhen the power generation amount is large, psLow power generation amount psAnd guiding the user to adjust the load electricity consumption to the time period with more generated energy. By adopting the dynamic pricing method, part (or all) of the electric loads of the user are flexible loads, and the electric power consumption or the electric time period can be dynamically adjusted. At the moment, the electric energy controller of the user can dynamically adjust the power utilization plan of the load, and under the condition of meeting the power utilization requirement of the load, the power consumption of the load is adjusted to a time period with lower electricity price as much as possible, so that the electricity expense of the user is reduced.
The time is divided into a plurality of time segments, and the length of each time segment is a fixed value, and may be set to one hour, for example. The power supply price of the photovoltaic power station in a certain time period t is recorded as ps,tAnd the photovoltaic power station makes a decision within the time period t-1. When a pricing decision is made for a photovoltaic power station, calculation needs to be performed on an electricity utilization plan of the photovoltaic power station in the next time period by combining a user according to the current electricity generation state and the prediction of the electricity generation amount in the next time period, and the detailed steps are shown in fig. 2.
Step 1: photovoltaic power station supply power price p in t time periods,tSet as the price p of the on-line electricityfAs an initial value.
Step 2: the photovoltaic power station sends p through the networks,tAnd sending to all users.
And step 3: the power controller of each user is based on the received ps,tAnd calculating the planned power consumption of the user in the time period t according to the power consumption preference set by the user and the schedulable time period of the power consumption load.
And 4, step 4: in order to protect the electricity consumption privacy of the user, the planned electricity consumption of the user is not directly sent to the photovoltaic power station, but is sent to the credible power grid control node in an encrypted mode within the specified time.
And 5: and the power grid control node decrypts and sums the received planned power consumption information of all the users in the time period t, and then sends the result to the photovoltaic power station.
Step 6: the photovoltaic power station plans the sum e of the power consumption in the time period t according to all the received usersuser,tAnd expected power generation amount e in the period tpv,tCalculating the expected income of the time period t, wherein the calculation formula is as follows:
rexp,t＝ps,tmin(epv,t,euser,t)。
and 7: price p of power supplys,tΔ p is increased, where Δ p is the step size. (Δ p is a preset corrected fixed value for cyclic accumulation to a suitable electricity price)
And 8: determining a power supply price ps,tWhether it is greater than retail price p of power gridrIf p iss,tIs not more than prSteps 2-8 are returned and repeated. If p iss,tGreater than prThen step 9 is entered.
And step 9: comparing expected income which can be obtained by the photovoltaic power station under all possible power supply prices, and selecting the set power price when the expected income is maximum as the power supply price p of the t time periods,tAnd the data are sent to a power grid control node and a user.
The power supply settlement method for the photovoltaic power station comprises the following steps:
and the power supply income of the photovoltaic power station and the electricity purchasing cost of each user are uniformly settled by the power grid control node. The electric quantity measured by the second electricity meter in the time period t is cuser,tAnd the total electric quantity directly provided by the photovoltaic power station to the user in the time period t is represented, and the electric quantity measured by the first electric quantity in the time period t is cfeed,tAt time t, denotesAnd the photovoltaic power station in the section inputs the total electric quantity of the public power grid. The electric quantity measured by the electric energy controller of the user i in the time period t is ci,tAnd represents the total amount of power consumed by user i during the time period t. Taking the time of day as an example, each time period is 1 hour, and the income settlement of the photovoltaic power station and the electric charge calculation method of each user are as follows.
And (3) photovoltaic power station income settlement:
if the photovoltaic power station adopts a fixed electricity price psAnd the electricity selling income of the photovoltaic power station in one day comprises two parts of the income of direct supply users and the income input into a public power grid. If the photovoltaic power station adopts a fixed price psThe electricity selling income calculation formula is as follows:
if the power station adopts dynamic pricing, the price is p in the time period ts,tThe electricity selling income calculation formula is as follows:
and (3) settlement of the electric charge of the user:
the electricity purchasing cost of the user i in one day comprises two parts of electricity purchasing cost from a photovoltaic power station and electricity purchasing cost from a public power grid. If the photovoltaic power station adopts a fixed price psThen the electricity charge calculation formula of the household i in one day is
Wherein N is the total number of local users.
If the power station adopts dynamic pricing, the calculation formula of the electricity charge of the user i in one day is
Wherein,the ratio of the total electric quantity provided by the photovoltaic power station to the users to the total electric quantity used by all the users in the t time period is represented,represents the amount of photovoltaic plant power consumed by user i during the t period, andrepresenting the amount of utility grid power consumed by user i during time period t.
Claims (8)
1. Photovoltaic power plant power supply dispatch system, photovoltaic module in the photovoltaic power plant converts solar energy into the direct current, and the direct current converts low pressure alternating current through the inverter into, its characterized in that: the low-voltage alternating current of dc-to-ac converter output divides two tunnel outputs, wherein connects step-up transformer through first knife switch, first coulometer all the way, inserts public electric wire netting high-voltage bus after step-up transformer steps up, and another way connects local low pressure user line to the user power supply through second knife switch, second ammeter, public electric wire netting high-voltage bus is connected with local low pressure user line through step-down transformer, third knife switch, user's power consumption load is connected with local low pressure user line through electric energy controller.
2. The photovoltaic power plant power supply scheduling system of claim 1, characterized in that: the system is provided with a power grid control node, the power grid control node is in mutual communication with the first electric quantity meter, the second electric quantity meter, the electric energy controllers of all users and the photovoltaic power station through a communication network, and information collected by the first electric quantity meter, the second electric quantity meter and the electric energy controllers is sent to the power grid control node in real time.
3. The photovoltaic power plant power supply scheduling system of claim 2, characterized in that: the first electricity meter is used for measuring the electric quantity output to a public power grid by the photovoltaic power station, the second electricity meter is used for measuring the electric quantity of a direct supply local user of the photovoltaic power station, and the electric energy controller of the user measures the power consumption of the electric load of the user.
4. The scheduling method of the photovoltaic power plant power supply scheduling system based on claims 1-3 is characterized in that: the power grid control node dynamically adjusts the opening and closing states of the first disconnecting link switch, the second disconnecting link switch and the third disconnecting link switch, so that the photovoltaic power station is switched among the following three power supply operation states;
1) the off-grid state of the photovoltaic power station is as follows: when the power generation power of the photovoltaic power station is smaller than the power supply standard, the third disconnecting link switch is switched on, the first disconnecting link switch and the second disconnecting link switch are switched off, and a local user is supplied with power by a high-voltage bus of a public power grid;
2) the photovoltaic power station and the public power grid jointly supply power: when the power generation power of the photovoltaic power station reaches the power supply standard but cannot completely meet the power consumption requirement of a local user, the second disconnecting link switch and the third disconnecting link switch are switched on, the first disconnecting link switch is switched off, and the local user is supplied with power by the photovoltaic power station and a public power grid high-voltage bus;
3) the independent power supply state of the photovoltaic power station is as follows: when the power generation power of the photovoltaic power station can meet the power consumption demand of a local user, the third disconnecting link switch is switched off, the first disconnecting link switch and the second disconnecting link switch are switched on, the local user is powered by the photovoltaic power station, and meanwhile, the residual electric quantity of the photovoltaic power station is input into a high-voltage bus of a public power grid for power supply.
5. The scheduling method of claim 4, wherein: the off-grid state of the photovoltaic power station further comprises that the third disconnecting switch is switched on and the first disconnecting switch and the second disconnecting switch are switched off when the maintenance and the power grid stability control are needed.
6. The electricity charge pricing method based on the scheduling method of claim 4 or 5, characterized in that: the method comprises a fixed price method and a dynamic pricing method;
the fixed price method comprises the following steps:
the price of the photovoltaic power station for supplying power to local users is psAnd the electricity price input into the public power grid by the photovoltaic power station is pfThe price of electricity bought from the public power grid by the local user is pr；
ps＝θpf+(1-θ)pr(ii) a Wherein theta is a self-defined adjusting parameter and meets the condition that theta is more than or equal to 0 and less than or equal to 1;
the dynamic pricing method comprises the following steps:
step 1: photovoltaic power station supply power price p in t time periods,tIs set as pfAs an initial value;
step 2: the photovoltaic power station sends p through the networks,tSending the data to all users;
and step 3: the power controller of each user is based on the received ps,tAcquiring the planned power consumption of each local user within a time period t according to preset data;
and 4, step 4: sending the planned electricity consumption of the user to a power grid control node;
and 5: the power grid control node sums the received planned power consumption information of all the users in the time period t, and then sends the result to the photovoltaic power station;
step 6: the photovoltaic power station plans the sum e of the power consumption in the time period t according to all the received usersuser,tAnd expected power generation amount e in the period tpv,tCalculating the expected profit of the t time period,
and 7: price p of power supplys,tIncreasing Δ p, wherein Δ p is the step size;
and 8: determining a power supply price ps,tWhether it is greater than retail price p of power gridrIf p iss,tIs not more than prGo back and repeat steps 2-8 if ps,tGreater than prEntering step 9;
and step 9: comparing expected income which can be obtained by the photovoltaic power station under all possible power supply prices, and selecting the set power price when the expected income is maximum as the power supply price p of the t time periods,tAnd the data are sent to a power grid control node and a user.
7. The electricity charge pricing method of the scheduling method according to claim 6, wherein: the power supply settlement method for the photovoltaic power station comprises the following steps: the power supply income of the photovoltaic power station and the electricity purchasing cost of each user are uniformly settled by the power grid control node, and the electric quantity measured by the second electricity meter in the time period t is cuser,tAnd the total electric quantity directly provided by the photovoltaic power station to the user in the time period t is represented, and the electric quantity measured by the first electric quantity in the time period t is cfeed,tAnd the electric quantity measured by the electric energy controller of the user i in the time period t is ci,tThe total electric quantity consumed by the user i in the time period t, the income settlement of the photovoltaic power station every day and the calculation method of the electric charge of each user are represented as follows:
if the photovoltaic power station adopts a fixed electricity price psAnd the electricity selling income of the photovoltaic power station in one day comprises two parts of the income of direct supply users and the income input into a public power grid:
the fixed price method electricity selling income calculation formula is as follows:
the dynamic pricing method has the following calculation formula of electricity selling income:
8. the electricity charge pricing method of the scheduling method according to claim 7, wherein: the user electric charge settlement method comprises the following steps: the electricity purchasing cost of the user i in one day comprises two parts of electricity purchasing cost from a photovoltaic power station and electricity purchasing cost from a public power grid;
if the photovoltaic power station adopts a fixed price method, the unit price of the electric quantity is psThen the electricity charge calculation formula of the household i in one day is
Wherein N is the total number of local users;
if the power station adopts a dynamic pricing method, the calculation formula of the electric charge of the user i in one day is
Wherein,the ratio of the total electric quantity provided by the photovoltaic power station to the users to the total electric quantity used by all the users in the t time period is represented,represents the amount of photovoltaic plant power consumed by user i during the t period, andrepresenting the amount of utility grid power consumed by user i during time period t.
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