CN109659977A - A kind of microgrid power switching control method based on electric power electric transformer - Google Patents
A kind of microgrid power switching control method based on electric power electric transformer Download PDFInfo
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- CN109659977A CN109659977A CN201811650900.5A CN201811650900A CN109659977A CN 109659977 A CN109659977 A CN 109659977A CN 201811650900 A CN201811650900 A CN 201811650900A CN 109659977 A CN109659977 A CN 109659977A
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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
- H02J3/381—Dispersed generators
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Abstract
The invention discloses a kind of microgrid power switching control method based on electric power electric transformer, microgrid are connected by the grid-connecting apparatus based on electric power electric transformer with higher level's power distribution network, and grid-connecting apparatus is made of electric power electric transformer and energy storage device；Microgrid is made of micro- source and load, and micro- source includes the micro- source of nature variation and schedulable micro- source, load include uncontrollable load and controllable burden；Electric power electric transformer output stage is controlled using PQ, by preset value and power reference, enables the variation of grid entry point Tracing power flow reference value, realizes that the Power Exchange of bulk power grid to microgrid is constant.The present invention realizes that micro-capacitance sensor and the friendly of bulk power grid access, and power generation and electric cost inside microgrid is enabled to optimize while power quality is unaffected in microgrid；Can not only quickly and accurately voltage of transformation, realize the connection of circuit and cut-off, can also be achieved the asynchronous operation of microgrid and power distribution network.
Description
Technical field
The invention belongs to energy Internet technical fields, and in particular to a kind of micro-capacitance sensor function based on electric power electric transformer
Rate switching control method.
Background technique
Be becoming tight traditional fossil energy day and the global overall background of energy-saving and emission-reduction under, distributed generation technology is rapidly sent out
Exhibition, it is more and more by people to incorporate distributed power generation, power electronics, the micro power network technology of control technique in power system
Pay attention to.To realize the effective supplement between microgrid and bulk power grid, micro-grid connection technical value must be probed into deeply.
Traditional micro-grid connection mode, which exists, and net spee is slow, impact is big, power supply reliability is low, trend is unable to control etc. asks
Topic, additionally, due between two power grids, there is no effective quarantine measures, any side grid collapses electric currents, harmonic pollution
The problems such as other side power grid will all be had an impact, power quality cannot be effectively ensured.New it is therefore necessary to use one kind
Micro-grid connection mode, Lai Tigao microgrid and bulk power grid grid-connected reliability and flexibility.
Summary of the invention
The purpose of the present invention is to provide a kind of the microgrid power switching control method based on electric power electric transformer, reality
Existing micro-capacitance sensor and the friendly of bulk power grid are accessed, and power generation and electricity consumption inside microgrid are enabled while power quality is unaffected in microgrid
Cost optimization.
The technical solution for realizing the aim of the invention is as follows: a kind of microgrid power exchange based on electric power electric transformer
Control method, microgrid are connected by grid-connecting apparatus with higher level's power distribution network, and the grid-connecting apparatus is by electric power electric transformer and energy storage
Device composition, microgrid are made of micro- source and load；Microgrid passes through electric power electric transformer and utility network at points of common connection
It is connected；Electric power electric transformer output stage is controlled using PQ, by preset value and power reference, enables grid entry point Tracing power flow
The variation of reference value realizes that the Power Exchange of bulk power grid to microgrid is constant.
Compared with prior art, remarkable advantage of the invention are as follows:
(1) voltage class of AC distribution net is exchange 10kV, meets the grid-connected need of micro-capacitance sensor distributed power generation and load
It asks；(2) electric power electric transformer grid-connecting apparatus access way: grid-connecting apparatus uses three-phase AC/DC/AC type electric power electric transformer
Topological structure, input stage three-phase fully-controlled rectifier, intergrade DC/DC DC converting unit and output stage three-phase fully-controlled inverter three
Part forms, and the structure power device number of packages is relatively fewer, and control is easier to；(3) when being incorporated into the power networks, grid-connecting apparatus is instead of tradition
Transformer and breaker realize voltage transformation and connecting and disconnecting of the circuit control, in grid-connecting apparatus the presence of DC link to microgrid and
Bulk power grid has carried out effective isolation, and false voltage, harmonic current of distribution etc. may not flow into microgrid, and same microgrid failure is not yet
Understand and bulk power grid is had an impact, or even also achieve the asynchronous operation of microgrid and bulk power grid, is truly realized oneself inside microgrid
Control management；(4) the microgrid invariable power Switch control strategy based on PET is used, realizes and exchanges power invariability in microgrid, and reach micro-
Power generation and electric cost are optimal inside power grid, by the voltage and frequency perseverance of the mutually coordinated realization microgrid carried to micro- source bear
It is fixed；(5) output stage of grid-connecting apparatus PET is controlled using PQ, is not easy the distributed generation resource adjusted use to power and is determined DC voltage
Control strategy；It is easy to adjust distributed generation resource according to power in distributed generation resource itself amount of capacity reasonable distribution microgrid to power
Vacancy；Sagging way to manage is used to controllable burden, own power demand is reduced according to power shortage size reasonable in microgrid.
Detailed description of the invention
Fig. 1 is that the micro-capacitance sensor invariable power based on PET exchanges control figure.
Specific embodiment
Distributed generation resource can allow user voluntarily to control electric energy, and massive blackout accident will not occur, so peace
Full Reliability comparotive is high, can make up the deficiency of power grid security and stability, can continue to power when unexpected storms occur.Electric power electricity
Sub- transformer relies on intrinsic advantage, can be with the generation technologies good combination such as wind-force, photovoltaic, forming region electric power networks.Base
Replace traditional power transformer and breaker in the grid-connecting apparatus of electric power electric transformer, not only realizes that voltage transformation and circuit are logical
Disconnected control, and can control effectively to two sides electric energy.Disconnecting switch is installed in grid-connecting apparatus two sides simultaneously, to match
Isolation circuit when net, microgrid break down or overhaul.
As shown in Figure 1, a kind of microgrid power switching control method based on electric power electric transformer, microgrid is by being based on
The grid-connecting apparatus of electric power electric transformer is connected with higher level's power distribution network of 10kV, the grid-connecting apparatus by electric power electric transformer and
Energy storage device composition；Microgrid is made of micro- source and load, and micro- source includes that nature changes micro- source and schedulable micro- source, and load includes not
Controllable burden and controllable burden；Microgrid is connected by electric power electric transformer with utility network at points of common connection；Electric power electricity
Sub- transformer output stage is controlled using PQ, passes through preset value and power reference Pgrid, enable grid entry point Tracing power flow reference value
Variation, realize bulk power grid to microgrid Power Exchange it is constant；Specifically:
If the power output in micro- source is Pmd+Pm0、Qmd+Qm0, wherein Pmd、QmdIndicate active, the nothing of the micro- source output of power adjustable degree
Function power, Pm0、Qm0Indicate that nature changes the active and reactive power of micro- source output；Once emergent power variation in microgrid, natural
Changed power will not be adjusted by changing micro- source power output, i.e. Δ Pm0=0, Δ Qm0=0；Schedulable micro- source is according to self-characteristic
The adjustment of output power is carried out, adjustment amount is Δ PmdWith Δ Qmd, obtain following formula:
In formula, PmdkAnd QmdkIt is single schedulable micro- source adjustment amount, G is schedulable micro- source quantity, Δ PmWith Δ QmIt is all
The adjustment amount of power caused by micro- source；
The demand of load is PLc+PL0、QLc+QL0, wherein PLc、QLcIndicate the active and reactive power demand of controllable burden
Amount, PL0、QL0Indicate the active and reactive demand of uncontrollable load；Due to not can be reduced the demand of uncontrollable load, so
The active and reactive demand adjustment amount of uncontrollable load is zero, i.e. Δ PL0=0, Δ QL0=0；Total load variable quantity such as equation (3),
(4) shown in:
In formula, PLckAnd QLckIt is the demand adjustment amount of single controllable load, L is controllable load quantity, Δ PLWith Δ QLFor institute
The adjustment amount of loaded power demand；
Under the microgrid control model of invariable power exchange, the power output variation in micro- source needs to meet formula (5):
In formula, Δ PgridWith Δ QgridFor the active and idle work variable quantity of grid entry point Power Exchange.
In the case where microgrid invariable power exchanges control model, the output stage of electric power electric transformer is controlled using PQ in grid-connecting apparatus
Strategy uses constant DC voltage control strategy for changing micro- source naturally, and control target is to maintain DC voltage constant to realize
Maximum power output；Sagging control is used for schedulable micro- source, control target is micro- from the distribution of body amount of capacity according to micro-
Power shortage in netting；Sagging way to manage is equally used for controllable burden, target is according to power shortage size in microgrid
Reduce own power demand.
Further, the voltage class of AC distribution net is exchange 10kV.
Further, grid-connecting apparatus uses three-phase AC/DC/AC type electric power electric transformer topological structure, input stage three
Phase full-controlled rectifier device, intergrade is DC/DC DC converting unit and output stage is three-phase fully-controlled inverter.
Further, changing micro- source naturally includes wind-driven generator, solar-energy photo-voltaic cell, and schedulable micro- source includes fuel
Battery, gas turbine.
Electric power electric transformer (the power that the functions such as electrical isolation, voltage transformation, reactive compensation are rolled into one
Electronic transformer, PET) become to traditional transformer and power electronic equipment progress integrated optimization, improve electricity
The important equipment of net device intelligence level.For electronic power transformer as a kind of novel electric power transformer, electric current can be flexible
Control has the function of to distribute various power supplys rationally, improve power supply quality, control power flow and improve system stability etc., from
And have the potentiality for solving many new problems that modern power systems face.
Scheme that the present invention is further explained with reference to the accompanying drawings and examples.
Embodiment
Fig. 1 is that the microgrid invariable power proposed by the present invention based on PET exchanges control figure, and micro-capacitance sensor is by being based on power electronics
The grid-connecting apparatus of transformer is connected with higher level's power distribution network of 10kV, and grid-connecting apparatus is by electric power electric transformer and energy storage device two
It is grouped as.Microgrid is made of a series of distributed generation resources and load, and distributed generation resource includes that power is not easy the micro- source adjusted and function
Rate is easy to the micro- source adjusted, and micro- source that power is not easy to adjust has wind-power electricity generation, photovoltaic power generation etc. to change power supply naturally, and power is easy to
There is the schedulable power supply such as fuel cell, miniature gas turbine in micro- source of adjustment；Load is broadly divided into uncontrollable load and controllably bears
Lotus, uncontrollable load refer to that sensitive load and important load, controllable burden refer to non-sensitive load and general load.Microgrid is in public company
Junction is connected by PET with utility network.PET output stage is controlled using PQ, passes through preset value and power reference Pgrid,
The variation of grid entry point Tracing power flow reference value is enabled, realizes that the Power Exchange of bulk power grid to microgrid is constant.
Since the output stage of PET uses PQ control strategy, can not to provide the support of voltage and frequency inside microgrid, so
What at this time the voltage of microgrid and frequency-invariant needed to carry by micro- source bear mutually coordinated realizes.Assuming that the power output in micro- source is
Pmd+Pm0、Qmd+Qm0, wherein Pmd、QmdIndicate the active and reactive power for micro- source output that power is easy to adjust, Pm0、Qm0Indicate function
Rate is not easy the active and reactive power of the micro- source adjusted output.Once emergent power variation so in microgrid, is not easy the micro- source adjusted
Changed power will not be adjusted in power output, i.e. Δ Pm0=0, Δ Qm0=0；Schedulable micro- source will carry out defeated according to self-characteristic
The adjustment of power out, adjustment amount are Δ PmdWith Δ Qmd, it can obtain following formula (1), (2):
In formula, PmdkAnd QmdkIt is single schedulable micro- source adjustment amount, G is schedulable micro- source quantity, Δ PmWith Δ QmIt is all
The adjustment amount of power caused by micro- source；
Equally, the demand of load is PLc+PL0、QLc+QL0, wherein PLc、QLcIndicate the active and reactive power of controllable burden
Demand, PL0、QL0Indicate the active and reactive demand of uncontrollable load.Due to not can be reduced the demand of uncontrollable load,
That is Δ PL0=0, Δ QL0=0.Shown in total load variable quantity such as equation (3), (4):
In formula, PLckAnd QLckIt is the demand adjustment amount of single controllable load, L is controllable load quantity, Δ PLWith Δ QLFor institute
The adjustment amount of loaded power demand.
Invariable power exchange microgrid control model under, micro- source needs to provide support for the changed power in microgrid, i.e., without
By the mutation or grid entry point changed power for being load, the power output variation in micro- source needs to meet formula (5):
In formula, Δ PgridWith Δ QgridIt is the active and idle work variable quantity of grid entry point Power Exchange.
In the case where microgrid invariable power exchanges control model, the output stage of PET uses PQ control strategy in grid-connecting apparatus, for function
Rate is not easy distributed generation resource adjusted such as wind-driven generator, solar-energy photo-voltaic cell etc. and uses constant DC voltage control strategy, control
Target processed is to maintain DC voltage constant to realize maximum power output；It is easy to the distributed generation resource such as fuel adjusted for power
Battery, miniature gas turbine etc. use sagging control, and control target is according to distributed generation resource itself amount of capacity reasonable distribution
Power shortage in microgrid；Sagging way to manage is equally used for controllable burden, target is big according to power shortage in microgrid
Small reasonable reduction own power demand.
Claims (5)
1. a kind of microgrid power switching control method based on electric power electric transformer, which is characterized in that microgrid passes through grid-connected
Device is connected with higher level's power distribution network, and the grid-connecting apparatus is made of electric power electric transformer and energy storage device, microgrid by micro- source and
Load composition, microgrid are connected by electric power electric transformer with utility network at points of common connection；Electric power electric transformer is defeated
Grade is controlled using PQ out, by preset value and power reference, enables the variation of grid entry point Tracing power flow reference value, realizes big electricity
The Power Exchange of net to microgrid is constant.
2. the microgrid power switching control method according to claim 1 based on electric power electric transformer, feature exist
In microgrid power switching control method specific steps are as follows:
If the power output in micro- source is Pmd+Pm0、Qmd+Qm0, wherein Pmd、QmdIndicate the active and reactive function of the micro- source output of power adjustable degree
Rate, Pm0、Qm0Indicate that nature changes the active and reactive power of micro- source output；Once emergent power variation in microgrid, changes naturally
Changed power will not be adjusted in micro- source power output, i.e. Δ Pm0=0, Δ Qm0=0；Schedulable micro- source is carried out according to self-characteristic
The adjustment of output power, adjustment amount are Δ PmdWith Δ Qmd, obtain following formula:
In formula, PmdkAnd QmdkIt is single schedulable micro- source adjustment amount, G is schedulable micro- source quantity, Δ PmWith Δ QmIt is all micro- sources
The adjustment amount of caused power；
The demand of load is PLc+PL0、QLc+QL0, wherein PLc、QLcIndicate the active and reactive power demand of controllable burden,
PL0、QL0Indicate the active and reactive demand of uncontrollable load；Due to not can be reduced the demand of uncontrollable load, so can not
The active and reactive demand adjustment amount for controlling load is zero, i.e. Δ PL0=0, Δ QL0=0；Total load variable quantity such as equation (3), (4)
It is shown:
In formula, PLckAnd QLckIt is the demand adjustment amount of single controllable load, L is controllable load quantity, Δ PLWith Δ QLIt is all negative
The adjustment amount of the power demand of load；
Under the microgrid control model of invariable power exchange, the power output variation in micro- source meets formula (5):
In formula, Δ PgridWith Δ QgridFor the active and idle work variable quantity of grid entry point Power Exchange.
3. the microgrid power switching control method according to claim 1 or 2 based on electric power electric transformer, feature
It is, the voltage class of AC distribution net is exchange 10kV.
4. the microgrid power switching control method according to claim 1 or 2 based on electric power electric transformer, feature
It is, grid-connecting apparatus uses three-phase AC/DC/AC type electric power electric transformer topological structure, and input stage is three-phase fully-controlled rectifier,
Intergrade is DC/DC DC converting unit and output stage is three-phase fully-controlled inverter.
5. the microgrid power switching control method according to claim 2 based on electric power electric transformer, feature exist
In changing micro- source naturally includes wind-driven generator, solar-energy photo-voltaic cell, and schedulable micro- source includes fuel cell and combustion gas wheel
Machine.
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Application publication date: 20190419 |