Ahoɔden a wɔkora so nhyehyɛe-aboa ahoɔden a wɔyɛ no foforo grid nkitahodi ano aduru no, wɔakyekyɛ mu titiriw ayɛ no ahorow abien: AC parallel nkitahodi ne DC coupling.
AC parallel nkitahodi ano aduru, sɛnea wɔakyerɛ wɔ mfonini no mu no, kyerɛ ahoɔden a wɔyɛ no foforo tumi ɛlɛtrɔnik grid-a ɛka bom, te sɛ photovoltaic inverters anaa mframa turbine converters, a wɔde fa AC ahoɔden grid so de bata ahoɔden a wɔkora so converter (PCS) ho. Wɔ EMS no biakoyɛ ne ne sohwɛ ase no, ɛyɛ nnwuma te sɛ peak shaving ne valley filling, ɛma nkɔmhyɛ a ɛyɛ pɛpɛɛpɛ no tu mpɔn, ne smoothing.
Mfasoɔ titire a ɛwɔ AC parallel connection schemes so ne anyinam ahoɔden nkitahodiɛ a ɛnyɛ den na emu da hɔ wɔ mfiri ntam, functional decoupling, ne standardization a ɛnyɛ den wɔ nnwinnadeɛ nkɔsoɔ ne ne yɛ mu ɔhaw titiriw a ɛwɔ mu ne ɛka a ɛkɔ soro ma nhama ne mfiri a wɔde abɔ mu, ahoɔhare a ɛyɛ ntɛm a wɔde di dwuma ma PCS, ne ahoɔden a wɔsakra no pii a ɛba fam.
Nkitahodi nhyehyɛe no betumi de DC nkitahodi a ɛwɔ ahoɔden a wɔyɛ no foforo grid-a ɛka bom yɛ anyinam ahoɔden nhyehyɛe dodow no ara mu no adi dwuma yiye, de batere ahoɔden akorae mfiri aka ho tẽẽ de atew tumi nsakrae pii a ɛba ahoɔden a wɔyɛ no foforo mu no so. Eyi ma nhyehyɛe no grid nkitahodi ne ahoɔden a wɔkora so yiye no tu mpɔn; ɛsan nso de ahoɔden a wɔyɛ no foforo grid-a ɛka bom mfiri ne grid nkitahodi akwan a ɛwɔ hɔ dedaw no di dwuma tẽẽ, na eyi hia a ɛho hia sɛ wɔtrɛw AC mfiri mu na ɛtew hardware sikasɛm ho ka so. Nanso, nkitahodi bi wɔ nhyehyɛe a wɔde di dwuma no ne mfiri a ɛwɔ hɔ dedaw a ɛka ahoɔden a wɔyɛ no foforo grid-a ɛka bom no ntam, a ne mu yɛ den no gyina ɔkwan a wɔfa so di grid nkitahodi a wɔde di dwuma wɔ mfitiase ahoɔden a wɔde yɛ foforo nhyehyɛe no mu no so.
Sɛ yɛfa mframa turbine grid-a ɛka bom converter a ɛwɔ ahoɔden a edi mũ sɛ nhwɛso, sɛnea wɔakyerɛ wɔ mfonini no mu no, mpɛn pii no ɛyɛ AC-DC-AC "akyi-kɔ-akyi" nhyehyɛe. Grid-afã converter no yɛ adwuma wɔ DC-side voltage regulation mode, bere a turbine-side converter no yɛ adwuma wɔ mframa turbine tumi control mode anaa torque control mode mu. DC fã no na ɛtetew abien no mu na wɔde wɔn ho di so, a capacitor bank kɛse a ɛwɔ DC fã no yɛ adwuma sɛ buffer ne decoupling adwinnade. Enti, ɛdenam BESS tumi pɔtee bi a wɔde bɛka DC fã no ho de ayɛ mframa ne ahoɔden akoraeɛ nhyehyɛeɛ a wɔaka abom so no, wɔbɛtumi adi mframa turbine no ahoɔden a ɛka grid-abom no so yie na wɔbɛtumi de ahoɔden no akɔ baabi foforɔ wɔ berɛ mu, a ɛnnya nkɛntɛnsoɔ kɛseɛ wɔ mframa turbine nhyehyɛeɛ no so, titire no mframa turbine converter no sohwɛ.
Ne nnyinasosɛm titiriw a ɛfa sohwɛ ho ne sɛ nea edidi so yi: Mpɔtam hɔ sohwɛfo no hyehyɛ adwumayɛ kwan, te sɛ peak shaving ne valley filling, nkɔmhyɛ pɛpɛɛpɛ a ɛma tu mpɔn, anaasɛ smoothing, na ɛka grid dispatch ho nsɛm bom de yɛ grid-connected power target command ∑P* nyinaa ma mframa-storage system no wɔ bere pɔtee bi mu ɛhwɛ mframa turbine ahoɔden a wɔde yɛ adwuma PNEne ahoɔden a wɔkora so nhyehyɛe no tebea wɔ bere ankasa mu, na ɛbu akontaa na ɛma ahoɔden akoraeɛ nhyehyɛeɛ no charge ne dischargeging control command P * .BESS:
BESS nam DC/DC converter so di mframa turbine no so, na ɛdi P* akyi.BESSahyɛdeɛ a ɛbɛma wɔanya ahoɔden a wɔkora soɔ na wɔayi no adi wɔ DC fã a ɛwɔ mframa turbine converter ne battery no ntam; grid-afã converter no yɛ adwuma wɔ rectifier mode mu, ɛma DC afã voltage Vde no gyina pintinn na ama wɔanya grid-a ɛka bom ahoɔden a efi mframa turbine no mu nyinaa ∑P:
Sɛ SOC a ɛwɔ ahoɔden a wɔkora so nhyehyɛe no mu no wɔ tebea a ɛho hia mu a ɛboro so a, ɛsɛ sɛ mpɔtam hɔ controller no nso to anohyeto ahyɛde a ɛfa output P * .NEno mframa turbine no denam nhyehyɛe a wɔbɛyɛ ama mframa turbine master controller no so, sɛnea ɛbɛyɛ a wobehu tumi-limited adwumayɛ a mframa turbine no yɛ.
Wɔakyerɛ control system no mfonini a wɔayɛ no mmerɛw wɔ mfonini no mu. V. Ɔde ne nsa kyerɛɛ ne sodcne U. ne Unhyehyɛeɛɛne DC-afã ahoɔden a ɛwɔ mframa turbine converter no mu ne phase voltage a ɛwɔ grid no mu no hyia, sɛnea ɛte biara; meBEss na ɛyɛ, Idc, INE, ne menhyehyɛeɛɛne ahoɔden a wɔkora so nhyehyɛe no charge ne disharging current hyia, DC current a ɛwɔ mframa turbine grid-side converter (a ɛsen fi current-side bus capacitor bank kɔ grid-side converter IGBT bridge arm), DC current a ɛwɔ mframa turbine afiri-side converter (a ɛsen fi afiri no-side converter IGBT bridge arm kɔ DC-afã bɔs capacitor bank), ne grid-a ɛka bom current a ɛwɔ mframa turbine grid-side converter (kyerɛ sɛ, grid-a ɛka bom current a ɛwɔ mframa-storage system no nyinaa).
Wɔ mframa turbines a wɔde induction generator (DFIG) ma mmɔho abien-fed ho no, anyinam ahoɔden nhyehyɛe (PNE) no yɛ rotor-side ne stator-side output power nyinaa, a ɛsɛ sɛ mpɔtam hɔ controller no susu ho yie berɛ a ɔrebu tumi ahyɛdeɛ ama ahoɔden akoraeɛ nhyehyɛeɛ no.
Yebetumi ahunu sɛ wɔ mframa-akoraeɛ nhyehyɛeɛ mu no, grid-afã converter ne turbine-side converter no nyinaa hwɛ mfitiaseɛ DC-side voltage regulation control mode ne turbine-side power control mode no so, a enhia nsakraeɛ biara wɔ control algorithm no mu. Nanso, mframa-akoraeɛ nhyehyɛeɛ no tebea ho nsɛm a wɔbɛnya wɔ berɛ mu na ɛyɛ pɛpɛɛpɛ no ho hia ma mpɔtam hɔ sohwɛfoɔ no sɛ ɔbɛnya ahoɔden akoraeɛ nhyehyɛeɛ ne mframa turbine sohwɛ nhyehyɛeɛ titire no so tumi a ɛyɛ biako.
Wɔakyerɛ nhyehyɛe a wɔde di dwuma ma parallel photovoltaic-storage DC nhyehyɛe no wɔ mfonini no mu. Saa nhyehyɛe a wɔde di dwuma yi nnya photovoltaic inverter no dwumadi so nkɛntɛnso, a ɛyɛ adwuma bere nyinaa wɔ ahoɔden a wɔkora so nhyehyɛe no peak-adesoa mode anaa bere tiaa mu tumi-limiting mode mu. Ahoɔden akoraeɛ nhyehyɛeɛ no, ne mpɔtam hɔ controller no bom yɛ ahoɔden nhyehyɛeɛ ntɛmntɛm de hwɛ grid-a ɛka bom ahoɔden a ɛwɔ photovoltaic-storage system no mu wɔ control error bandwidth a wɔma ho kwan no mu.
Ahoɔden foforɔ a wɔde bɛboa wɔ grid nkitahodiɛ mu no yɛ beaeɛ a ɛho hia paa a wɔde di dwuma wɔ BESS (Balanced Energy Storage System) mu. Sɛ yɛhwɛ bere a wɔde di dwuma a, wobetumi akyekyɛ eyi mu ayɛ no dɔnhwerew biara peak-filling ne simma-level nkɔso a ɛba wɔ nkɔmhyɛ mu pɛpɛɛpɛyɛ ne nsakrae a ɛkɔ so yiye mu. Kan no de ahoɔden a ɛwɔ grid a ɛwɔ hɔ dedaw no mu no di dwuma koraa de gye ahoɔden foforo na ɛtew...
Ahoɔden a wɔyɛ no foforo grid nkitahodi a wɔbɛboa no yɛ beae titiriw a wɔde di dwuma ma Baseline Energy Saving System (BESS). Sɛ yɛhwɛ bere nhyehyɛe mu a, yebetumi akyekyɛ eyi mu ayɛ no dɔnhwerew biara a wɔde yiyi ne bon mu a wɔde hyɛ mu, ne simma-nkɔso a ɛba wɔ nkɔmhyɛ a ɛyɛ pɛpɛɛpɛ ne nsakrae a wɔyɛ no mmerɛw mu. Kan no ho hia ma ahoɔden a wɔyɛ no foforo a ɛwɔ grid a ɛwɔ hɔ dedaw no mu a wɔde bedi dwuma koraa, atew unit a wɔtaa de sie no so, anaasɛ wɔbɛkwati ahoɔden a wɔyɛ no foforo a wɔbɛtew so bere tenten. Nea etwa to no, a ɛne mfiridwuma a wɔde hyɛ nkɔm a ɛfa ahoɔden a wɔyɛ no foforo ho no bom ma nhyehyɛe ne sɛnea wobetumi de ahoɔden a wɔyɛ no foforo grid nkitahodi no tu mpɔn, ɛma grid adamfofa yɛ kɛse, na ɛtew grid fast frequency regulation resources a wɔde di dwuma no so.
Wɔ nnwuma a mfaso wɔ so mu no, peak shaving ne valley filling dwumadie hwehwɛ BESS nhyehyɛeɛ a ɛtumi sie anaa ɛgyae nnɔnhwerew pii anyinam ahoɔden, a ɛhia sɛ wɔde battery units akɛseɛ-capacity. Wɔ mprempren adwumayɛ nhyehyɛe ahorow ase no, saa dwumadi yi a wɔde bedi dwuma ara kwa no taa yɛ nea sikasɛm mu mfaso nni so, anaasɛ ɛde asiane kɛse ba sɛ sikasɛm mu mfaso so tew wɔ mmere horow mu. Nanso, ɛnam nkɔsoɔ a ɛkɔ so wɔ ahoɔden a wɔyɛ no foforɔ ho nkɔmhyɛ a ɛyɛ pɛpɛɛpɛ ne BESS tumi sohwɛ nhyehyɛeɛ mu nti, ɛyɛ yie koraa sɛ wɔde simma-level BESS-aboa ahoɔden a wɔyɛ no foforɔ grid nkitahodiɛ dwumadie bɛka peak shaving ne valley filling projects ho. Wei ma adwuma bi tumi yɛ dwumadie a ɛkɔ akyiri wɔ adwumayɛkuo a ɛyɛ biakoyɛ ase a EMS anaa mpɔtam hɔ sohwɛfoɔ de di dwuma, sɛ ɛyɛ berɛ-kyɛ anaa bere koro mu, na ɛnam so ma adwuma no sikasɛm mu mmɔdenbɔ nyinaa tu mpɔn. Bio nso, sɛ yɛsusu tumi ne tumi nhyehyeɛ ahwehwɛdeɛ a ɛbɛma nkɔmhyɛ a ɛyɛ pɛpɛɛpɛ ne dwumadie a ɛyɛ mmerɛw atu mpɔn a, saa dwumadie yi mu dodoɔ no ara fa ahoɔden a ɛba fam-tumi, ahoɔden a ɛkorɔn-frequency ahoɔden-su ahoɔden a wɔkora so ho. Enti, saa dwumadie yi a wɔde bɛka ho no wɔ nkɛntɛnsoɔ ketewa bi wɔ nhyehyɛɛ a ɛwɔ peak-shaving ne valley-filling projects a ɛwɔ hɔ dada no so, na ɛma ɛyɛ adwuma wɔ mfiridwuma mu.